CN114797450A

CN114797450A - Regenerated liquid drainage structure of catalytic flue gas desulfurization device and catalytic flue gas desulfurization tower

Info

Publication number: CN114797450A
Application number: CN202210387466.6A
Authority: CN
Inventors: 黄昆明; 李新; 吴波; 朱敦龙; 李江荣
Original assignee: Chengdu Daqi Environmental Technology Co ltd
Current assignee: Chengdu Daqi Environmental Technology Co ltd
Priority date: 2022-04-13
Filing date: 2022-04-13
Publication date: 2022-07-29

Abstract

The invention discloses a regenerated liquid drainage structure of a catalytic flue gas desulfurization device and a catalytic flue gas desulfurization tower using the regenerated liquid drainage structure of the catalytic flue gas desulfurization device, and aims to solve the technical problem that the pipe wall of a metal material such as stainless steel and the like in a U-shaped liquid seal in the range close to a gas-liquid separation surface of an input end of a liquid seal pipeline is easy to corrode. The liquid discharge structure includes: the first liquid discharge pipe is arranged from top to bottom; the second liquid discharge pipe is arranged on the side surface of the first liquid discharge pipe and is provided with a bending structure which extends downwards, turns back and extends upwards, one end of the second liquid discharge pipe is connected with the corresponding liquid discharge port, and the other end of the second liquid discharge pipe is connected with the upper end or the pipe wall of the first liquid discharge pipe; wherein, during the desulfurization, liquid is stored in the bent structure to form a liquid seal; the pipe wall of the liquid seal in which the gas-liquid separation surface is positioned is made of plastic, and the strength, the chemical stability and the heat distortion temperature of the plastic are close to or better than those of polypropylene PP plastic when the plastic is used.

Description

Regenerated liquid drainage structure of catalytic flue gas desulfurization device and catalytic flue gas desulfurization tower

Technical Field

The embodiment of the application relates to the technical field of flue gas desulfurization, in particular to a catalyst washing and regenerating method for a catalytic flue gas desulfurization device, a regenerated liquid drainage structure for the catalytic flue gas desulfurization device and a catalytic flue gas desulfurization tower.

Background

The catalytic flue gas desulfurization technology is taken as a known desulfurization technology with application prospect, and the basic principle is as follows: the sulfur dioxide, water and oxygen in the flue gas are adsorbed on the catalyst and react under the catalytic action of the active components to generate sulfuric acid. After the catalyst has reached a certain degree of adhering sulfuric acid, the catalyst may be washed with a regeneration liquid (usually dilute sulfuric acid and/or water) to remove the adhering sulfuric acid on the catalyst and release the active sites of the catalyst. The used regeneration liquid can be reused as a byproduct (usually dilute sulfuric acid). Relevant references include: the current situation and trend of the catalytic flue gas desulfurization technology, 2009 academic annual meeting corpus of the Chinese environmental science society, 2009, huangpan and the like.

When the catalytic flue gas desulfurization technology is applied to practical engineering, a special catalytic flue gas desulfurization tower and a desulfurization reactor arranged in the catalytic flue gas desulfurization tower are needed. The chinese prior application (hereinafter referred to as the prior application) with the application number of 202120944544.9, which is applied by the same applicant as the present application, discloses a catalytic flue gas desulfurization tower, wherein a desulfurization reactor is provided with at least one gas inlet, at least one gas outlet, at least one liquid outlet, and a catalyst located in the desulfurization reactor, and the desulfurization reactor is provided with a spray device for a regeneration liquid used for washing and regenerating the catalyst; and during desulfurization, flue gas enters the desulfurization reactor from the gas inlet, is desulfurized through the catalyst and then is discharged from the gas outlet, sulfur dioxide in the flue gas reacts on the catalyst to form sulfuric acid when passing through the catalyst, and the sulfuric acid enters regeneration liquid sprayed on the catalyst and then is discharged from the liquid outlet when the catalyst is washed and regenerated.

At present, aiming at the problems, defects or unreasonable parts still existing in the design of a catalytic flue gas desulfurization tower and a desulfurization reactor, the improvement of the engineering application of the catalytic flue gas desulfurization technology further improves the space. These problems, drawbacks, or unreasonables include: 1) when the catalyst in the selected desulfurization reactor needs to be washed and regenerated, the desulfurization reactor is often directly switched to a washing and regenerating state of the catalyst from the desulfurization state, and when the flue gas temperature is high (for example, the flue gas temperature in the coking industry is up to 180 ℃), the catalyst temperature is also high, and at this time, if the catalyst is immediately washed and regenerated, the catalyst is easy to break due to large temperature difference between the front and the rear. 2) When the catalyst is washed and regenerated, the regenerated liquid needs to be discharged from a liquid outlet of the desulfurization reactor, and the liquid outlet needs to be plugged after regeneration so as to prevent smoke leakage. At present, a U-shaped liquid seal is designed aiming at a regenerated liquid drainage structure, the regenerated liquid is discharged through the U-shaped liquid seal when the catalyst is washed and regenerated, and a liquid drainage port is blocked through the U-shaped liquid seal after regeneration. But because can't control the pressure of U-shaped liquid seal exit end as required at present, it is right at every turn all can automatic storage regeneration liquid in the U-shaped liquid seal after the catalyst washes regeneration to it is inconvenient to bring the maintenance of desulfurization reactor. 3) According to the summary of the maintenance experience of the catalytic flue gas desulfurization engineering application project equipment and facilities accumulated by the inventor, the pipe wall of metal materials such as stainless steel and the like in the range of the gas-liquid separation surface close to the input end of the liquid seal pipeline in the U-shaped liquid seal is easy to corrode, but the phenomenon and the cause thereof are not disclosed, but the regenerated liquid is likely to leak, so that the risk hazard is not small.

Disclosure of Invention

The embodiment of the application provides a catalysis method flue gas desulfurization device regeneration liquid drainage structure and a catalysis method flue gas desulfurization tower using the same to solve the technical problem that the pipe wall of metal materials such as stainless steel and the like close to the gas-liquid separation surface range of the input end of a liquid seal pipeline in a U-shaped liquid seal is easy to corrode.

According to one aspect of the application, a regenerated liquid drainage structure of a catalytic flue gas desulfurization device is provided, the catalytic flue gas desulfurization device comprises a desulfurization reactor, the desulfurization reactor is provided with at least one gas inlet, at least one gas outlet, at least one liquid drainage port and a catalyst positioned in the desulfurization reactor, and a spray device for washing and regenerating regenerated liquid for the catalyst is arranged on the desulfurization reactor; when in desulfurization, flue gas enters a desulfurization reactor from the gas inlet, is desulfurized through a catalyst and then is discharged from the gas outlet, sulfur dioxide in the flue gas reacts on the catalyst to form sulfuric acid when passing through the catalyst, and when the catalyst is washed and regenerated, the sulfuric acid enters regeneration liquid sprayed on the catalyst and then is discharged from a liquid outlet; the method comprises the following steps: the first liquid discharge pipe is arranged from top to bottom, the upper end or the pipe wall of the first liquid discharge pipe is connected with the second liquid discharge pipe, and the lower end of the first liquid discharge pipe is connected with the regeneration liquid tank; the second liquid discharge pipe is arranged on the side surface of the first liquid discharge pipe and is provided with a bending structure which extends downwards, turns back and extends upwards, one end of the second liquid discharge pipe is connected with the corresponding liquid discharge port, and the other end of the second liquid discharge pipe is connected with the upper end or the pipe wall of the first liquid discharge pipe; wherein, during the desulfurization, liquid is stored in the bent structure to form a liquid seal; the pipe wall of the liquid seal in which the gas-liquid separation surface is positioned is made of plastic, and the strength, the chemical stability and the heat distortion temperature of the plastic are close to or better than those of polypropylene PP plastic when the plastic is used.

According to another aspect of the application, a catalytic flue gas desulfurization tower is provided, wherein flue gas desulfurization is carried out through a desulfurization reactor, the desulfurization reactor is provided with at least one gas inlet, at least one gas outlet, at least one liquid outlet, a catalyst positioned in the desulfurization reactor, and a spray device of regeneration liquid for washing and regenerating the catalyst; when in desulfurization, flue gas enters a desulfurization reactor from the gas inlet, is desulfurized through a catalyst and then is discharged from the gas outlet, sulfur dioxide in the flue gas reacts on the catalyst to form sulfuric acid when passing through the catalyst, and when the catalyst is washed and regenerated, the sulfuric acid enters regeneration liquid sprayed on the catalyst and then is discharged from a liquid outlet; the method comprises the following steps: a left desulfurization reactor riser comprising at least two desulfurization reactors mounted in a vertical arrangement on respective support platforms on the left side of different floors of a frame-type support structure; a right desulfurization reactor riser comprising at least two of the desulfurization reactors mounted in a vertical arrangement on support platforms on the right side of different floors of the frame-type support structure, respectively; the air inlet pipe network comprises an air inlet main pipe and air inlet branch pipes, the air inlet main pipe is vertically arranged on the front side of the frame type supporting structure and is positioned between the left side desulfurization reactor vertical column and the right side desulfurization reactor vertical column, and the air inlet branch pipes enable the air inlet main pipe to be respectively connected with air inlets of the desulfurization reactors and are positioned on the front sides of the corresponding desulfurization reactors; the exhaust pipe network comprises an exhaust main pipe vertically arranged between the left desulfurization reactor vertical column and the right desulfurization reactor vertical column and exhaust branch pipes which enable the exhaust main pipe to be respectively connected with the exhaust ports of the desulfurization reactors and are positioned above the corresponding desulfurization reactors; the regeneration liquid circulating system comprises at least one regeneration liquid tank and a regeneration liquid circulating control pipe network connected between the at least one regeneration liquid tank and each desulfurization reactor, the regeneration liquid circulating control pipe network is provided with an output side control pipe network, an input side control pipe network and regeneration liquid driving equipment, the output side control pipe network can guide the regeneration liquid in the selected regeneration liquid tank into a regeneration liquid spraying device of the selected desulfurization reactor, the input side control pipe network can guide the regeneration liquid output from a liquid outlet of the selected desulfurization reactor into the selected regeneration liquid tank, and the regeneration liquid driving equipment can provide required power for the regeneration liquid; the output side control pipeline network comprises an output side main pipe, output side first branches and output side second branches, the output side first branches are respectively connected between the output side main pipe and a corresponding regeneration liquid tank, the output side second branches are respectively connected between the output side main pipe and a corresponding spraying device of a desulfurization reactor, output side first control valves are correspondingly arranged on the output side first branches, and the regeneration liquid driving equipment is connected on the output side main pipe in series; the input side control pipe network comprises input side main pipes, input side first branches and input side second branches, the input side first branches are respectively connected between the input side main pipes and one corresponding regeneration liquid tank, the input side second branches are respectively connected between the input side main pipes and one corresponding liquid discharge port of the desulfurization reactor, and input side first control valves are correspondingly arranged on the input side first branches; the regenerated liquid drainage structure of the catalytic flue gas desulfurization device is adopted, the first drainage pipe formed by the input side header pipe is the input side header pipe, and the second branch of each input side respectively forms each second drainage pipe.

The pipe wall of the liquid seal gas-liquid separation surface of the second liquid discharge pipe is made of plastic, and the strength, chemical stability and thermal deformation temperature of the selected plastic are close to or better than those of polypropylene PP plastic when in use, so that the basic use requirement can be met, and the corrosion problem of the liquid seal gas-liquid separation surface can be effectively improved.

The present application will be further described with reference to the following drawings and detailed description. Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the present application and are included to explain, by way of illustration, embodiments of the present application and not to limit the embodiments of the present application.

FIG. 1 is a schematic view of a flue gas desulfurization apparatus according to an embodiment of the prior application.

FIG. 2 is a partial schematic view of the flue gas desulfurization unit shown in FIG. 1.

FIG. 3 is a partial schematic view of the flue gas desulfurization unit of FIG. 1.

FIG. 4 is a schematic view of a regeneration liquid circulation section of the flue gas desulfurization apparatus shown in FIG. 1.

Fig. 5 is a schematic partial structure diagram of a catalytic flue gas desulfurization tower according to an embodiment of the present application.

Fig. 5 may reflect the shape, layout, and arrangement of the inlet and exhaust ductwork of the desulfurization reactor.

Fig. 6 is a schematic partial structure diagram of a catalytic flue gas desulfurization tower according to an embodiment of the present application.

Fig. 6 may reflect a regeneration fluid circulation system arrangement.

Fig. 7 is a schematic partial structure diagram of a catalytic flue gas desulfurization tower according to an embodiment of the present application.

FIG. 7 can reflect the arrangement of the grid support beam under the bottom plate of the desulfurization reactor and the internal columns of the desulfurization reactor.

Fig. 8 is a schematic partial structure diagram of a catalytic flue gas desulfurization tower according to an embodiment of the present application.

Fig. 8 is a view from B-B in fig. 7.

Fig. 9 is a view from a-a in fig. 7.

Fig. 10 is a schematic elevation view of a desulfurization reactor in the catalytic flue gas desulfurization tower shown in fig. 7.

Fig. 11 is a schematic partial structure diagram of a catalytic flue gas desulfurization tower according to an embodiment of the present application.

FIG. 11 may reflect the placement of catalyst partitions inside the desulfurization reactor.

Fig. 12 is a schematic structural diagram of a catalyst separator in a catalytic flue gas desulfurization device according to an embodiment of the present application.

Fig. 13 is a view from a-a in fig. 12.

Fig. 14 is a schematic view of an installation structure of a central pillar and a main beam of a catalytic flue gas desulfurization device according to an embodiment of the present application.

Fig. 15 is a schematic view of an installation structure of a middle column and a main beam of a catalytic flue gas desulfurization device according to an embodiment of the present application.

Fig. 16 is a schematic view of a secondary beam mounting structure in a catalytic flue gas desulfurization device according to an embodiment of the present application.

Fig. 17 is a partially enlarged view at I in fig. 16.

Fig. 18 is a schematic structural view of the main beam based on fig. 16, wherein acid-proof bricks are laid on the main beam at intervals along the length direction of the main beam.

Fig. 19 is a schematic diagram of a positioning groove structure of a catalyst separator in a catalytic flue gas desulfurization device according to an embodiment of the present application.

FIG. 20 is a photograph showing the overall structure of a catalytic flue gas desulfurization tower according to an embodiment of the present invention.

FIG. 20 may reflect the rear-side appearance of a catalytic flue gas desulfurization tower (i.e., a "square tower") according to an embodiment of the present application.

Fig. 21 is a photograph showing a maintenance process of a catalytic flue gas desulfurization tower according to an embodiment of the present application.

Fig. 22 is a schematic diagram of a regenerated liquid drainage structure of a catalytic flue gas desulfurization device according to an embodiment of the present application.

Fig. 23 is a schematic partial structure diagram of a catalytic flue gas desulfurization tower according to an embodiment of the present application.

Fig. 23 can reflect the regenerated liquid drainage structure and the cooling liquid spraying device of the catalytic flue gas desulfurization device.

Fig. 24 is a schematic flow chart of a method for washing and regenerating a catalyst of a catalytic flue gas desulfurization device according to an embodiment of the present application.

Fig. 25 is a schematic flow chart of a method for washing and regenerating a catalyst of a catalytic flue gas desulfurization device according to an embodiment of the present application.

Detailed Description

The present application will now be described more fully hereinafter with reference to the accompanying drawings. Those of ordinary skill in the art will be able to implement the present application based on these teachings. Before describing the present application in connection with the accompanying drawings, it should be particularly noted that:

the technical solutions and features provided in the respective sections including the following description may be combined with each other without conflict. Furthermore, where possible, these technical solutions, technical features and related combinations may be given specific technical subject matter and are protected by the accompanying patent.

The embodiments of the application referred to in the following description are generally only some embodiments, rather than all embodiments, on the basis of which all other embodiments that can be derived by a person skilled in the art without inventive step should be considered within the scope of patent protection.

With respect to the terms and units in this specification: the terms "comprising," "including," "having," and any variations thereof in this specification and in the claims and following claims are intended to cover non-exclusive inclusions. The terms "front", "rear", "left" and "right" in this specification and the corresponding claims and the relevant portions thereof refer to relative positional relationships based on the drawings (the corresponding directions of "front", "rear", "left" and "right" have been labeled in fig. 5, 6, 7 and 11). In addition, other related terms and units can be reasonably construed based on the description to provide related contents.

Content of the prior application

Fig. 1 is a schematic view of a flue gas desulfurization apparatus according to an embodiment of the prior application. FIG. 2 is a partial schematic view of the flue gas desulfurization unit shown in FIG. 1. FIG. 3 is a partial schematic view of the flue gas desulfurization unit of FIG. 1. FIG. 4 is a schematic view of a regeneration liquid circulation section of the flue gas desulfurization apparatus shown in FIG. 1.

As shown in fig. 1 to 4, a flue gas desulfurization apparatus according to an embodiment of the prior application includes a flue gas desulfurization section 10 and a regeneration liquid circulation section 12. The flue gas desulfurization unit 10 includes at least one desulfurization reactor 11, the desulfurization reactor 11 has at least one gas inlet 111, at least one gas outlet 112, at least one liquid outlet 113, a catalyst 114 located in the desulfurization reactor 11, and a spray device (not shown in the figure) for a regeneration liquid for washing and regenerating the catalyst 114, the flue gas during desulfurization enters the desulfurization reactor 11 from the gas inlet 111, is desulfurized through the catalyst 114, and is then discharged from the gas outlet 112, sulfur dioxide in the flue gas reacts on the catalyst 114 to form sulfuric acid when passing through the catalyst 114, and the sulfuric acid enters the regeneration liquid sprayed on the catalyst 114 during washing and regeneration of the catalyst 114 and is finally discharged from the liquid outlet 113.

The regeneration liquid circulation unit 12 includes a plurality of regeneration liquid tanks 121 and a regeneration liquid circulation control pipe network connected between the plurality of regeneration liquid tanks 121 and the desulfurization reactor 11, the regeneration liquid circulation control pipe network includes an output side control pipe network 122, an input side control pipe network 123, and a regeneration liquid driving device 124, the output side control pipe network 122 can guide the regeneration liquid in any one of the plurality of regeneration liquid tanks 121 to the regeneration liquid spraying device of the desulfurization reactor 11, the input side control pipe network 123 can guide the regeneration liquid output from the liquid discharge port 113 of the desulfurization reactor 11 to any one of the regeneration liquid tanks 121, and the regeneration liquid driving device 124 can provide required power to the regeneration liquid.

Specifically, the output-side control pipe network 122 includes an output-side header pipe 1221 connected to the shower device of the desulfurization reactor 11, and output-side first branch lines 1222 each connected between the output-side header pipe 1221 and a corresponding one of the regeneration liquid tanks 121, and each output-side first branch line 1222 is provided with an output-side first control valve 1223 in correspondence thereto. The regeneration liquid drive device 124 is connected in series to the output side header 1221. The input-side control pipe network 123 includes an input-side header pipe 1231 connected to the drain port 113 of the desulfurization reactor 11, and input-side first branch pipes 1232 each connected between the input-side header pipe 1231 and a corresponding one of the regeneration liquid tanks 121, and an input-side first control valve 1233 is provided in each input-side first branch pipe 1232.

Furthermore, a return pipe 1224 is connected between the line of the output-side header pipe 1221 on the output side of the regenerative liquid drive apparatus 124 and the input-side header pipe 1231, and a return pipe control valve 1225 is provided in the return pipe 1224.

A typical usage of the above flue gas desulfurization apparatus is that dilute sulfuric acids with different concentrations are respectively stored in the plurality of regeneration liquid tanks 121 as regeneration liquids, when the catalyst 114 in the desulfurization reactor 11 needs to be washed and regenerated, first, the output side first control valve 1223 and the input side first control valve 1233 corresponding to the regeneration liquid tank 121 with the highest concentration of dilute sulfuric acid stored in the plurality of regeneration liquid tanks 121 are opened, then the dilute sulfuric acid in the regeneration liquid tank 121 with the highest concentration of dilute sulfuric acid is sent to the regeneration liquid spraying apparatus of the desulfurization reactor 11 through the corresponding output side first branch 1222, the regeneration liquid driving device 124 (usually a pump) and the output side header pipe 1221, and the regeneration liquid after the catalyst regeneration is returned to the original regeneration liquid tank 121 from the input side header pipe 1231 and the corresponding input side first branch 1232; after the catalyst is washed and regenerated for a period of time by using the dilute sulfuric acid with the highest concentration, the output side first control valve 1223 and the input side first control valve 1233 corresponding to the regeneration liquid tank 121 storing the dilute sulfuric acid with the lower concentration by one stage in the plurality of regeneration liquid tanks 121 are opened again, and the catalyst is washed and regenerated again by using the same method; the above operations are repeated, and the catalyst can be washed and regenerated by dilute sulfuric acid or clean water with lower concentration. This enables the sulfuric acid on the active sites of the catalyst to be more sufficiently eluted, thereby improving the effect of regenerating the catalyst.

Because the sulfate ion concentration of the regeneration liquid stored in each regeneration liquid tank 121 dynamically changes along with the regeneration of the catalyst, in order to adjust the sulfate ion concentration of the regeneration liquid stored in each regeneration liquid tank 121, the return pipe control valve 1225 can be opened under the condition of need, and meanwhile, the required output side first control valve 1223 and the required input side first control valve 1233 are opened to start the regeneration liquid driving device 124, so that the regeneration liquid in any one regeneration liquid tank 121 can be input into any other regeneration liquid tank 121, and the effect of adjusting the sulfate ion concentration of the corresponding regeneration liquid by mixing the regeneration liquids with different sulfate ion concentrations is achieved. This also has the benefits for flue gas desulfurization units: the concentration of sulfate ions in the regeneration liquid used in each regeneration can be controlled more precisely, and the arrangement of dilute sulfuric acid in different regeneration liquid tanks 121 can be facilitated.

In one general embodiment, as shown in FIGS. 1-2, the flue gas desulfurization section 10 comprises at least two desulfurization reactors 11; for this purpose, the output-side control pipe network 122 includes output-side second branches 1226 each connected between the output-side header pipe 1221 and the shower device corresponding to one of the desulfurization reactors 11, and the input-side control pipe network 123 includes input-side second branches 1234 each connected between the input-side header pipe 1231 and the drain port 113 corresponding to one of the desulfurization reactors 11.

In an alternative embodiment, as shown in fig. 1-2, the flue gas desulfurization section 10 comprises at least one series of desulfurization reactor columns comprising at least two desulfurization reactors 11 mounted in vertical arrangement on respective support platforms on different levels 131 of the frame-type support structure 13. The flue gas desulfurization part 10 is designed to be of a structure comprising at least one group of desulfurization reactor columns, and the desulfurization reactor columns comprise at least two desulfurization reactors 11 which are respectively arranged on the supporting platforms of different floors 131 of the frame-type supporting structure 13 in a vertical arrangement mode, so that the size of a single desulfurization reactor can be reduced to the greatest extent, and the manufacturing difficulty and the manufacturing cost of the single desulfurization reactor are greatly reduced; in addition, the single desulfurization reactor is installed in a storey mode through the frame type supporting structure 13, so that the smaller floor area of the flue gas desulfurization part 10 is guaranteed, and meanwhile, the maintenance of each desulfurization reactor 11 is facilitated.

On this basis, the flue gas desulfurization part 10 can also comprise an air inlet pipe network 14 and an exhaust pipe network 15; the air inlet pipe network 14 comprises an air inlet main pipe 141 vertically arranged beside the desulfurization reactor vertical column and air inlet branch pipes 142 respectively connecting the air inlet main pipe 141 with the air inlet 111 of a corresponding desulfurization reactor 11 in the desulfurization reactor vertical column; the exhaust pipe network 15 includes an exhaust manifold 151 vertically disposed beside the vertical row of the desulfurization reactors, and exhaust branch pipes 152 respectively connecting the exhaust manifold 151 with the exhaust port 112 of a corresponding one of the desulfurization reactors 11 in the vertical row of the desulfurization reactors.

The air inlet branch pipe 142 has a bent structure extending downward, then turning back and extending upward, and one end of the air inlet branch pipe 142 for connecting with the air inlet header 141 is higher than one end of the air inlet branch pipe 142 for connecting with the air inlet 111 of a corresponding desulfurization reactor 11, and the bent structure is provided with a liquid drainage structure. When the intake branch pipe adopts the above structural design, the regeneration liquid can be prevented from flowing back into the intake manifold 141.

Optionally, the output side control pipe network 122 and the input side control pipe network 123 are generally distributed on opposite sides of the frame-type support structure 13. Preferably, when the flue gas desulfurization unit 10 includes at least two sets of desulfurization reactor columns, if the at least two sets of desulfurization reactor columns are distributed in the left-right direction, the output-side control pipe network 122 and the input-side control pipe network 123 are generally distributed on the front and rear sides of the frame-type support structure 13. Meanwhile, the air inlet pipe network 14 and the exhaust pipe network 15 can be distributed on the front side and the rear side of the frame-type supporting structure as a whole.

In one embodiment, as shown in fig. 1 and 3, the plurality of regeneration liquid tanks 121 are horizontally arranged in parallel at the bottom of the frame-type support structure 13; the output side manifold 1221 comprises output side manifold horizontal sections and output side manifold vertical sections, wherein the output side manifold horizontal sections are horizontally arranged along the direction in which the plurality of regeneration liquid tanks 121 are arranged in parallel, the output side manifold vertical sections are connected with the output side manifold horizontal sections through the regeneration liquid driving device, the output side manifold horizontal sections are provided with output side first branches 1222 at intervals, and the output side manifold vertical sections are provided with output side second branches 1226 at intervals; the input side header pipe 1231 includes an input side header pipe horizontal section and an input side header pipe vertical section, the input side header pipe horizontal section is horizontally arranged along the parallel direction of the plurality of regeneration liquid tanks, the input side header pipe vertical section is connected with the input side header pipe horizontal section, the input side header pipe horizontal section is provided with input side first branches 1232 at intervals, and the input side header pipe vertical section is provided with input side second branches at intervals.

In one embodiment, at least one regeneration liquid tank 121 of the plurality of regeneration liquid tanks 121 is connected to the product recovery tank through a regeneration liquid transfer pipeline in which a membrane filter pump 125 and a membrane filter 126 are arranged in series, so as to recycle the regeneration liquid.

Further description of the prior application

From the foregoing, it can be seen that the prior application provides, in fact, a catalytic flue gas desulfurization tower that can be described and/or summarized specifically as including the following:

1) the catalytic flue gas desulfurization tower carries out flue gas desulfurization through a desulfurization reactor 11, wherein the desulfurization reactor 11 is provided with at least one air inlet 111, at least one air outlet 112, at least one liquid outlet 113 and a catalyst 114 positioned in the desulfurization reactor, and a spray device for a regeneration liquid used for washing and regenerating the catalyst 114 is arranged on the desulfurization reactor 11; when in desulfurization, flue gas enters the desulfurization reactor 11 from the gas inlet 111, is desulfurized through the catalyst 114 and then is discharged from the gas outlet 112, sulfur dioxide in the flue gas reacts on the catalyst 114 when passing through the catalyst 114 to form sulfuric acid, and when the catalyst 114 is washed and regenerated, the sulfuric acid enters the regeneration liquid sprayed on the catalyst 114 and then is discharged from the liquid outlet.

2) The catalytic flue gas desulfurization tower comprises a left desulfurization reactor vertical column, a right desulfurization reactor vertical column, an air inlet pipe network, an exhaust pipe network and a regenerated liquid circulating system. The left desulfurization reactor vertical column comprises at least two desulfurization reactors 11 which are respectively arranged on the supporting platforms on the left sides of different floors of a frame type supporting structure 13 in a vertical arrangement mode; the right desulfurization reactor vertical column comprises at least two desulfurization reactors 11 which are respectively arranged on the supporting platforms on the right sides of different floors of the frame-type supporting structure 13 in a vertical arrangement mode; the air inlet pipe network 14 comprises an air inlet main pipe 141 (see fig. 1-2) vertically arranged at the front side of the frame-type supporting structure 13 and positioned between the left desulfurization reactor vertical column and the right desulfurization reactor vertical column, and air inlet branch pipes 142 respectively connecting the air inlet main pipe 141 with the air inlets 111 of the desulfurization reactors and positioned at the front side of the corresponding desulfurization reactor 11; the exhaust pipe network 15 comprises an exhaust manifold 151 (see fig. 1-2) which can be vertically arranged at the rear side of the frame-type support structure 13 and between the left-side and right-side desulfurization reactor columns, and exhaust branch pipes 152 which connect the exhaust manifold 151 with the exhaust ports 112 of the respective desulfurization reactors and are located above the respective desulfurization reactors 11; the regeneration liquid circulation system comprises a plurality of regeneration liquid tanks 121 and a regeneration liquid circulation control pipe network connected between the plurality of regeneration liquid tanks 121 and each desulfurization reactor 11, the regeneration liquid circulation control pipe network is provided with an output side control pipe network 122, an input side control pipe network 123 and a regeneration liquid driving device 124, the output side control pipe network 122 can guide the regeneration liquid in the selected regeneration liquid tank 121 to a regeneration liquid spraying device of the selected desulfurization reactor 11, the input side control pipe network 123 can guide the regeneration liquid output from a liquid outlet 113 of the selected desulfurization reactor 11 to the selected regeneration liquid tank 121, and the regeneration liquid driving device 124 can provide required power for the regeneration liquid.

3) The left and right desulfurization reactor columns are spaced apart in the left-right width direction of the frame-type support structure 13 to form a piping equipment installation region in the middle of the frame-type support structure 13, and the exhaust manifold 151 is placed in the piping equipment installation region (see fig. 1-2).

Obviously, since the left desulfurization reactor vertical column and the right desulfurization reactor vertical column are arranged at an interval in the left-right width direction of the frame-type support structure 13 so as to form a piping installation region in the middle of the frame-type support structure 13, the exhaust manifold 151 is placed in the piping installation region, and the space occupation in the front-rear direction of the catalytic flue gas desulfurization tower can be reduced. In addition, the length of each exhaust branch pipe 152 is facilitated to be shortened, which contributes to cost saving. As can be seen in fig. 1-2, the exhaust port 112 on the desulfurization reactor 11 is located near the rear side of the desulfurization reactor 11, away from the center of the top of the desulfurization reactor 11.

In addition, in the prior application, it is mentioned that "the intake manifold 142 has a curved structure extending downward and then folded back and extending upward", and the specific case of the curved structure of the intake manifold 142 can be more visually seen through fig. 1-2. It can also be seen from fig. 1-2 that the input-side second branch 1234 likewise adopts a similar curved configuration. It is noted that the purpose of the curved structure on inlet manifold 142 and inlet side second branch 1234 is that the curved structure may form a liquid seal (i.e., the U-shaped liquid seal mentioned in the background) when liquid is injected into the curved structure. Therefore, when the bent structure of the inlet branch pipe 142 forms a liquid seal, the corresponding desulfurization reactor 11 does not receive flue gas any more, and the catalyst 114 in the desulfurization reactor 11 can be washed and regenerated. When the bent structure on the input-side second branch 1234 forms a liquid seal, the flue gas in the corresponding desulfurization reactor 11 will not leak from the input-side second branch 1234, so as to maintain the desulfurization operation of the desulfurization reactor 11.

The catalytic flue gas desulfurization tower provided by the prior application has been in practical use in engineering (but does not mean that the catalytic flue gas desulfurization tower has been publicly used). The applicant has found in practice that the catalytic flue gas desulfurization tower provided by the prior application still has the following problems, drawbacks or unreasonables.

First, the desulfurization reactor 11 in the catalytic flue gas desulfurization tower provided in the prior application still employs a conventional cylindrical reactor (since the applicant of the prior application is the same applicant as the present application, the applicant determined that the corresponding practical embodiment of the prior application employs a cylindrical reactor), and the cylindrical reactor causes at least the following problems.

Firstly, the catalytic flue gas desulfurization tower comprises a frame type supporting structure, a left side desulfurization reactor vertical column, a right side desulfurization reactor vertical column, an air inlet pipe network, an exhaust pipe network, a regeneration liquid circulating system and the like, and the position layout relationship among the left side desulfurization reactor vertical column, the right side desulfurization reactor vertical column, the air inlet pipe network, the exhaust pipe network and the frame type supporting structure determines that more wasted space exists around the cylindrical reactor. Therefore, under the condition of large flue gas flow, the diameter of the selected cylindrical reactor is correspondingly increased.

Secondly, adjacent cylindrical reactors are independent each other about same layer on the catalytic flue gas desulfurization tower, and every cylindrical reactor all need make alone, is unfavorable for the saving of desulfurization reactor manufacturing material.

Thirdly, because the amount of the catalyst loaded in one desulfurization reactor is large, if all the catalysts in the same desulfurization reactor are washed and regenerated at the same time, the flow rate of the required regenerated liquid is large, and the cost of the pipeline facilities which need to be equipped correspondingly is high, therefore, the desulfurization reactor can be considered to be provided with a catalyst partition plate which is used for separating different catalyst placing cavities, and the spraying device can be correspondingly configured to be provided with a spraying unit which can independently spray the regenerated liquid on the catalysts in the different catalyst placing cavities, so that the catalysts in the different catalyst placing cavities can be washed and regenerated successively, and the construction and use cost of the pipeline facilities can be reduced. However, when the desulfurization reactor is a cylindrical reactor, it is not easy to design the layout of the catalyst separators in combination with the number and positions of the spray sites in the spray unit and the number and positions of the openings (including the exhaust port and the first openable/closable operation port, the second openable/closable operation port, etc., which will be described later) in the desulfurization reactor.

Secondly, the frame-type supporting structure of the catalytic flue gas desulfurization tower provided by the prior application is a common steel structure, and the cylindrical reactor is made of glass fiber reinforced plastics or stainless steel, so that the frame-type supporting structure and the cylindrical reactor need to be built respectively and then assembled, and the overall building cost is high.

In addition, the frame-type supporting structure only can support the cylindrical reactor and cannot strengthen the bottom plate of the cylindrical reactor, and the bottom plate of the desulfurization reactor bears the pressure of internal components of the desulfurization reactor, so that the thickness of the bottom plate of the desulfurization reactor is thicker, and the manufacturing and installation cost is further increased.

Thirdly, as mentioned above, since the amount of the catalyst loaded in one desulfurization reactor is large, if all the catalysts in the same desulfurization reactor are to be washed and regenerated at the same time, the flow rate of the required regeneration liquid is large, and the cost of the pipeline facilities required to be equipped correspondingly is high, it can be considered that a catalyst partition plate is arranged in the desulfurization reactor, the catalyst partition plate is used for separating different catalyst placing cavities, and the spraying device can be configured correspondingly to have a spraying unit which can independently spray the regeneration liquid to the catalysts in the different catalyst placing cavities, so that the catalysts in the different catalyst placing cavities can be washed and regenerated successively, and the construction and use costs of the pipeline facilities can be reduced. In the current practical engineering application, since the internal components of the desulfurization reactor are constructed after the outer shell of the desulfurization reactor is constructed and fixed on the frame-type supporting structure (only the outer shell of the desulfurization reactor can be customized on the market, but the internal components of the desulfurization reactor can only be constructed by itself), the problems of the specific structure of the catalyst partition plate and the installation and fixation of the catalyst partition plate in the desulfurization reactor become problems.

Fourthly, divide into flue gas distribution layer, catalyst from bottom to top that the desulfurization reactor is inside in the present practical engineering application and place the layer and the flue gas spills over the layer, be equipped with gas distribution bearing structure in the flue gas distribution layer, the catalyst is placed in the catalyst of gas distribution bearing structure top is placed the layer, and the flue gas is followed during the desulfurization the air inlet gets into flue gas distribution layer then passes through gas distribution bearing structure dispersedly from bottom to top the catalyst gets into the flue gas spills over the layer and follows the gas vent discharges. Wherein the gas distribution support structure generally comprises columns arranged in a planar array on the bottom plate of the desulfurization reactor and a catalyst gas permeable support structure supported above the columns. Since the desulfurization reactor internals are built after the desulfurization reactor shell is constructed and secured to the frame-type support structure, the columns and catalyst permeable support structure also need to be installed after the desulfurization reactor shell is constructed and secured to the frame-type support structure. Therefore, it is problematic to adopt a catalyst air-permeable support structure of which specific structure is adopted and how to install the catalyst air-permeable support structure inside the desulfurization reactor.

Fifthly, as mentioned above, in the current practical engineering application, the inside of the desulfurization reactor is divided into a flue gas distribution layer, a catalyst placement layer and a flue gas overflow layer from bottom to top, a gas distribution support structure is arranged in the flue gas distribution layer, the catalyst is placed in the catalyst placement layer above the gas distribution support structure, and during desulfurization, flue gas enters the flue gas distribution layer from the gas inlet and then dispersedly passes through the gas distribution support structure from bottom to top, and the flue gas overflows the layer and is discharged from the gas outlet. In addition, in order to facilitate loading and unloading of the catalyst and maintenance of the flue gas distribution layer, the desulfurization reactor may further include at least one first openable and closable operation port for loading the catalyst into the desulfurization reactor, at least one second openable and closable operation port for unloading the catalyst from the desulfurization reactor, and at least one third openable and closable operation port for operation of the gas distribution support structure. Therefore, the air inlet of the desulfurization reactor can be arranged on the side surface of the flue gas distribution layer, the air outlet and the first openable and closable operation port of the desulfurization reactor can be arranged on the top surface of the flue gas overflow layer, the second openable and closable operation port of the desulfurization reactor can be arranged on the side surface of the catalyst placing layer and close to the bottom of the catalyst placing layer, the third openable and closable operation port of the desulfurization reactor can be arranged on the side surface or the bottom surface of the flue gas distribution layer, and the liquid outlet of the desulfurization reactor can be arranged on the bottom surface of the flue gas distribution layer. It can be seen that the desulfurization reactor has at least one air inlet, at least one air outlet, at least one liquid outlet, at least one first openable and closable operation port, at least one second openable and closable operation port, and at least one third openable and closable operation port, and these openings need to be distributed in the flue gas distribution layer, the catalyst placement layer, and the flue gas overflow layer, which is currently not reasonable in terms of the arrangement orientation of these openings.

Sixthly, when the catalyst in the selected desulfurization reactor needs to be washed and regenerated, the desulfurization reactor is often directly switched to a washing and regenerating state of the catalyst from the desulfurization state, and when the flue gas temperature is high (for example, the flue gas temperature in the coking industry is up to 180 ℃), the catalyst temperature is also high, and at this time, if the catalyst is immediately washed and regenerated, the catalyst is easy to be broken due to large temperature difference between the front and the rear.

Seventh, when the catalyst is washed and regenerated, the regeneration liquid needs to be discharged from the liquid discharge port of the desulfurization reactor, and the liquid discharge port needs to be plugged after regeneration to prevent the leakage of flue gas. At present, a U-shaped liquid seal is designed aiming at a regenerated liquid drainage structure, the regenerated liquid is discharged through the U-shaped liquid seal when the catalyst is washed and regenerated, and a liquid drainage port is blocked through the U-shaped liquid seal after regeneration. But because at present can't control the pressure of U-shaped liquid seal exit end as required (direct intercommunication atmospheric environment after the downward bending in input side house steward 1231 upper end), it is right at every turn all can automatic storage regeneration liquid in the U-shaped liquid seal after the catalyst washes regeneration to the maintenance of desulfurization reactor brings the inconvenience.

Eighthly, according to the summary of the maintenance experience of equipment and facilities of engineering application projects aiming at the catalytic flue gas desulfurization technology, which is accumulated by the inventor, the pipe wall of metal materials such as stainless steel and the like in the range of the gas-liquid separation surface close to the input end of the liquid seal pipeline in the U-shaped liquid seal is easy to corrode, but the phenomenon and the cause thereof are not disclosed, but the regenerated liquid is likely to leak, so that the risk is not small.

The present application provides the following solutions to one or more of the problems, drawbacks, or disadvantages described above. The relevant solution will be explained below with reference to the drawings. These schemes may be combined with each other without conflict; the features of these solutions can also be combined with each other.

Fig. 5 is a schematic partial structure diagram of a catalytic flue gas desulfurization tower according to an embodiment of the present application. Fig. 5 may reflect the shape, layout, and arrangement of the inlet and exhaust ductwork of the desulfurization reactor. Fig. 6 is a schematic partial structure diagram of a catalytic flue gas desulfurization tower according to an embodiment of the present application. Fig. 6 may reflect a regeneration fluid circulation system arrangement. Fig. 7 is a schematic partial structure diagram of a catalytic flue gas desulfurization tower according to an embodiment of the present application. FIG. 7 can reflect the arrangement of the grid support beam under the bottom plate of the desulfurization reactor and the internal columns of the desulfurization reactor. Fig. 8 is a schematic partial structure diagram of a catalytic flue gas desulfurization tower according to an embodiment of the present application. Fig. 8 is a view from B-B in fig. 7. Fig. 9 is a view from a-a in fig. 7. Fig. 10 is a schematic elevation view of a desulfurization reactor in the catalytic flue gas desulfurization tower shown in fig. 7. Fig. 11 is a schematic partial structure diagram of a catalytic flue gas desulfurization tower according to an embodiment of the present application. FIG. 11 may reflect the placement of catalyst partitions inside the desulfurization reactor. Fig. 12 is a schematic structural diagram of a catalyst separator in a catalytic flue gas desulfurization device according to an embodiment of the present application. Fig. 13 is a view from a-a in fig. 12. FIG. 20 is a photograph showing the overall structure of a catalytic flue gas desulfurization tower according to an embodiment of the present invention. FIG. 20 may reflect the rear-side appearance of a catalytic flue gas desulfurization tower (i.e., a "square tower") according to an embodiment of the present application.

As shown in fig. 5-13 and fig. 20, a catalytic flue gas desulfurization tower according to an embodiment of the present invention performs flue gas desulfurization through a desulfurization reactor 11, where the desulfurization reactor 11 has at least one gas inlet 111, at least one gas outlet 112, at least one liquid outlet 113, and a catalyst 114 located in the desulfurization reactor, and a spray device for a regeneration liquid used for washing and regenerating the catalyst 114 is disposed on the desulfurization reactor 11; when in desulfurization, flue gas enters the desulfurization reactor 11 from the gas inlet 111, is desulfurized through the catalyst 114 and then is discharged from the gas outlet 112, sulfur dioxide in the flue gas reacts on the catalyst 114 to form sulfuric acid when passing through the catalyst 114, and when the catalyst 114 is washed and regenerated, the sulfuric acid enters regeneration liquid sprayed on the catalyst 114 and then is discharged from the liquid outlet 113.

In addition, this catalytic process flue gas desulfurization tower still includes: a left desulfurization reactor riser 11A, said left desulfurization reactor riser 11A comprising at least two of said desulfurization reactors 11 mounted in vertical arrangement on respective support platforms on the left side of different floors of a frame-type support structure 13; a right desulfurization reactor riser 11B, said right desulfurization reactor riser 11B comprising at least two of said desulfurization reactors 11 mounted in a vertical arrangement on respective support platforms on the right side of different floors of said frame-like support structure 13; an air inlet pipe network 14, wherein the air inlet pipe network 14 comprises an air inlet main pipe 141 vertically arranged at the front side of the frame-type supporting structure 13 and positioned between the left desulfurization reactor vertical column 11A and the right desulfurization reactor vertical column 11B, and air inlet branch pipes 142 respectively connecting the air inlet main pipe 141 with the air inlets 111 of the desulfurization reactors 11 and positioned at the front side of the corresponding desulfurization reactors 111; an exhaust pipe network 15, wherein the exhaust pipe network 15 comprises an exhaust main pipe 151 vertically arranged at the rear side of the frame-type supporting structure 13 and between the left desulfurization reactor vertical column 11A and the right desulfurization reactor vertical column 11B, and exhaust branch pipes 152 respectively connecting the exhaust main pipe 151 with the exhaust ports 112 of the desulfurization reactors 11 and located above the corresponding desulfurization reactors 11; and a regeneration liquid circulation system, wherein the regeneration liquid circulation system comprises at least one regeneration liquid tank 121 and a regeneration liquid circulation control pipe network connected between the at least one regeneration liquid tank 121 and each desulfurization reactor 11, the regeneration liquid circulation control pipe network is provided with an output side control pipe network 122, an input side control pipe network 123 and a regeneration liquid driving device 124, the output side control pipe network 122 can guide the regeneration liquid in the selected regeneration liquid tank 121 into a regeneration liquid spraying device of the selected desulfurization reactor 11, the input side control pipe network 123 can guide the regeneration liquid output from a liquid outlet of the selected desulfurization reactor 11 into the selected regeneration liquid tank 121, and the regeneration liquid driving device 124 can provide required power for the regeneration liquid.

In addition, the key point is that in the catalytic flue gas desulfurization tower: the 11 outlines of desulfurization reactor constitute first cuboid, left side desulfurization reactor erects 11A overall outline with the 11B overall outline of right side desulfurization reactor erects and constitutes the second cuboid respectively, by left side desulfurization reactor erects 11A right side desulfurization reactor erects 11B and the desulfurizing tower main part overall outline that frame-type bearing structure 13 constitutes the third cuboid. For convenience of description, such a catalytic fuming gas desulfurization tower may be referred to as a "square tower". The external structure of the square tower can be more visually seen through fig. 20.

It can be seen through fig. 5 and 20 that because 11 outlines of desulfurization reactor constitute first cuboid, left side desulfurization reactor erects the whole outline of 11A and the whole outline of right side desulfurization reactor erects the whole outline of 11B and constitutes the second cuboid respectively, by left side desulfurization reactor erects the outline of 11A right side desulfurization reactor erects the outline of 11B and the desulfurizing tower main part whole outline that frame-type bearing structure 13 constitutes the third cuboid, like this, whole desulfurizing tower main part is not only more pleasing to the eye, and the while is also more abundant with the whole shared space allocation of catalytic process flue gas desulfurization tower to desulfurization reactor 11, reduces the waste of 11 peripheral spaces of desulfurization reactor. Compared with a catalytic flue gas desulfurization tower adopting a cylindrical reactor, the horizontal projection area of the desulfurization reactor 11 of the square tower is larger under the condition that the whole occupied area is the same, so that the desulfurization reactor 11 of the square tower can contain more catalysts.

The catalytic flue gas desulfurization tower (square tower) can be further designed as follows: the inside of the desulfurization reactor 11 is divided into a flue gas distribution layer 115, a catalyst placement layer 116 and a flue gas overflow layer 117 from bottom to top, a gas distribution support structure 118 is arranged in the flue gas distribution layer 115, the catalyst is placed 114 in the catalyst placement layer 116 above the gas distribution support structure 118, and during desulfurization, flue gas enters the flue gas distribution layer 115 from the gas inlet 111 and then dispersedly passes through the gas distribution support structure 118 from bottom to top, and the flue gas overflow layer 117 is discharged from the gas outlet 112.

On this basis, for the convenience of operation, the desulfurization reactor 11 may further have at least one first openable/closable operation port 119A, at least one second openable/closable operation port 119B, and at least one third openable/closable operation port 119C, the first openable/closable operation port 119A may be used for loading the catalyst 114 into the desulfurization reactor 11, the second openable/closable operation port 119B may be used for unloading the catalyst 114 from the desulfurization reactor 11, and the third openable/closable operation port 119C may be used for the operation of the gas distribution support structure 118. These openable and closable operation ports are commonly and commonly called "manholes".

On this basis, the gas inlet 111 of the desulfurization reactor 11 may be disposed on the front side surface corresponding to the flue gas distribution layer 115, the gas outlet 112 and the first openable/closable operation port 119A of the desulfurization reactor 11 may be disposed on the top surface corresponding to the flue gas overflow layer 117, the second openable/closable operation port 119B of the desulfurization reactor 11 may be disposed on the side surface belonging to the outside of the third rectangular body corresponding to the catalyst placement layer 116, the third openable/closable operation port 119C of the desulfurization reactor 11 may be disposed on the side surface or the bottom surface corresponding to the flue gas distribution layer 115, and the liquid outlet 113 of the desulfurization reactor 11 may be disposed on the bottom surface corresponding to the flue gas distribution layer 115.

Because the amount of catalyst loaded in one desulfurization reactor 11 is large, if all catalysts in the same desulfurization reactor 11 are to be washed and regenerated at the same time, the flow rate of the required regeneration liquid is large, and the cost of the pipeline facilities required to be equipped is high, therefore, a catalyst partition plate 16 (specifically, a catalyst partition plate 16 is placed above the gas distribution support structure 118 inside the desulfurization reactor 11) can be arranged in the desulfurization reactor 11, the catalyst partition plate 16 is used for separating the catalyst placement layer 116 into different catalyst placement cavities (for example, a left rectangular catalyst placement cavity 16A and a right rectangular catalyst placement cavity 16B in fig. 11), and the spraying device can be configured to have a spraying unit which can independently spray the regeneration liquid to the catalysts in the different catalyst placement cavities, so that the catalysts in the different catalyst placement cavities can be washed and regenerated successively, so as to reduce the construction and use cost of the pipeline facility.

When the outline of the desulfurization reactor 11 forms a first rectangular body (i.e., the desulfurization reactor 11 is a rectangular reactor), the catalyst holding layer 116 may be partitioned into a first rectangular catalyst holding cavity and a second rectangular catalyst holding cavity (e.g., a left rectangular catalyst holding cavity 16A and a right rectangular catalyst holding cavity 16B in fig. 11) by the catalyst partition 16, and at this time, the spray device includes a first spray unit that can independently spray the catalyst in the first rectangular catalyst holding cavity with the regeneration liquid and a second spray unit that can independently spray the catalyst in the second rectangular catalyst holding cavity with the regeneration liquid; correspondingly, the desulfurization reactor 11 may have a first openable/closable operation port 119A and a second openable/closable operation port 119B corresponding to the first rectangular catalyst holding cavity and the second rectangular catalyst holding cavity of the desulfurization reactor 11 one by one, respectively, so as to load and unload the catalyst to and from the first rectangular catalyst holding cavity and the second rectangular catalyst holding cavity, respectively.

Obviously, since the desulfurization reactor 11 employs the rectangular reactor, the catalyst holding layer 116 is divided into the first rectangular catalyst holding cavity and the second rectangular catalyst holding cavity by the catalyst partition 16, and then the first rectangular catalyst holding cavity and the second rectangular catalyst holding cavity are both rectangular structures having a plurality of cylindrical surfaces in different directions, so that the arrangement of the openings such as the first openable operation port 119A and the second openable operation port 119B is made easier, and more reasonable opening layout orientation design is easily achieved.

Generally, the first rectangular catalyst holding cavity and the second rectangular catalyst holding cavity are respectively a rectangular cavity with a length greater than a width. At this time, it is suggested to arrange the position of the first openable/closable operation port 119A close to a side surface which belongs to the outside of the third rectangular body and which is an end surface in the longitudinal direction of the corresponding rectangular cavity (for example, the first openable/closable operation port 119A is close to the rear side of the desulfurization reactor 11 in fig. 1), which is advantageous in that: when the catalyst is poured into the corresponding rectangular cavity through the first openable/closable operation port 119A, the catalyst flows more easily in the direction of the length of the corresponding rectangular cavity, thereby reducing the impact of the catalyst on the catalyst separator 16, helping to prevent the catalyst separator 16 from collapsing or being damaged. It should be noted that the arrangement of the position of the first openable/closable operation port 119A close to the side surface which belongs to the outer side of the third rectangular body and serves as the end surface in the longitudinal direction of the corresponding rectangular cavity is a consideration of the inventors based on the fact that the first rectangular catalyst housing cavity and the second rectangular catalyst housing cavity are each a rectangular cavity having a length greater than the width, in combination with the phenomenon that the catalyst partition plate in the conventional cylindrical reactor is easily collapsed or damaged.

Preferably, the catalyst partition 16 divides the catalyst placement layer 116 into a left rectangular catalyst placement cavity 16A and a right rectangular catalyst placement cavity 16B, the left rectangular catalyst placement cavity 16A and the right rectangular catalyst placement cavity 16B having a length in the front-rear direction of the desulfurization reactor 11 and a width in the left-right direction of the desulfurization reactor; meanwhile, the second openable/closable operation port 119B of the desulfurization reactor 11 is disposed on the front side or the rear side corresponding to the catalyst-containing layer 116, and the third openable/closable operation port 119C of the desulfurization reactor 11 is disposed on the front side or the rear side corresponding to the flue gas distribution layer 115. The benefits of such an arrangement are: the second openable/closable operation port 119B and the third openable/closable operation port 119C in the catalytic flue gas desulfurization tower may be concentrated on the front side and/or the rear side of the catalytic flue gas desulfurization tower, and the cantilevered-structure walkways required to be provided on the side wall of the catalytic flue gas desulfurization tower to operate these second openable/closable operation port 119B and the third openable/closable operation port 119C may be disposed only on the front side and/or the rear side of the catalytic flue gas desulfurization tower, while the cantilevered-structure walkways may not be disposed on the left side and/or the right side of the catalytic flue gas desulfurization tower (for example, it can be seen from fig. 20 that the left side and the right side of the catalytic flue gas desulfurization tower are used for disposing stairs).

More preferably, the second openable/closable operation port 119B of the desulfurization reactor 11 is disposed on the rear side corresponding to the catalyst-placing layer, which corresponds to disposing the second openable/closable operation port 119B on the opposite side of the intake port 111 so as to avoid the influence of the exhaust pipe network 15. Similarly, the third openable/closable operation port 119C is also preferably disposed on the rear side corresponding to the catalyst-placing layer. In this case, the first openable/closable operation port 119A of the desulfurization reactor 11 may be located close to the rear side surface of the desulfurization reactor 11 (i.e., the first openable/closable operation port 119A is located close to the second openable/closable operation port 119B as shown in fig. 1), which can further improve the convenience of catalyst loading and unloading. Hereinafter, the present specification will be directed to the maintenance of the catalytic flue gas desulfurization tower using a catalyst transfer device that facilitates the transfer of the catalyst in the desulfurization reactor of the (N + 1) th floor to the desulfurization reactor of the N-th floor when the orientation of the first openable/closable operation port 119A is close to the orientation of the second openable/closable operation port 119B.

Generally, the inlet manifold 142 and the inlet side second branch 1234 (see fig. 1) of the inlet side control network 123 each employ the curved configuration described above that forms a liquid seal when liquid is injected into the curved configuration. Therefore, when the bent structure of the inlet branch pipe 142 forms a liquid seal, the corresponding desulfurization reactor 11 does not receive flue gas any more, and the catalyst 114 in the desulfurization reactor 11 can be washed and regenerated. When the bent structure on the input-side second branch 1234 forms a liquid seal, the flue gas in the corresponding desulfurization reactor 11 will not leak from the input-side second branch 1234, so as to maintain the desulfurization operation of the desulfurization reactor 11.

The catalytic flue gas desulfurization tower of the above embodiment can be constructed and implemented in at least the following ways. These several ways will be explained below. It should be noted, however, that the specific details and/or related technical disclosure referred to below need not apply only to the embodiments described above, if at all.

In a first mode

The frame-type support structure 13 and the desulfurization reactors 11 on the frame-type support structure 13 are constructed as a reinforced concrete integrated structure. Wherein, integrative structure of reinforced concrete contains and is located respectively the left side desulfurization reactor that four edges of the second cuboid that left side desulfurization reactor erects 11A overall outline constitute erects a support post 132A, is located respectively the right side desulfurization reactor erects a support post 132B, the connection of four edges of the second cuboid that right side desulfurization reactor erects 11B overall outline constitutes is in the left side desulfurization reactor erects a support post 132A and roof beam 134 (crossbeam), setting between the right side desulfurization reactor erects a support post 132B are in grid formula supporting beam 133 and each desulfurization reactor 11's of desulfurization reactor 11 bottom plate below shell. The concrete inner wall of the desulfurization reactor 11 may be laid with an anticorrosive material, such as acid-resistant bricks.

Because the frame-type supporting structure 13 and the desulfurization reactors 11 on the frame-type supporting structure 13 are built into a reinforced concrete integrated structure, the frame-type supporting structure 13 and the desulfurization reactors 11 are built synchronously, the construction speed of the catalytic flue gas desulfurization tower can be increased, and the construction cost can be reduced. Through grid-type supporting beam 133 below the bottom plate of desulfurization reactor 11, the strength of the bottom plate of desulfurization reactor 11 (grid-type supporting beam 133 and the bottom plate of desulfurization reactor 11 are of an integrated concrete structure) can be greatly enhanced, and the overall strength and stability of the catalytic flue gas desulfurization tower are improved. Meanwhile, the presence of the grid-type support beams 133 makes it unnecessary to provide the desulfurization reactor 11 with a floor plate that is too thick, contributing to saving of construction materials and reducing the weight of the desulfurization reactor 11.

Specifically, the number of the left desulfurization reactor vertical supporting columns 132A is four, and the number of the right desulfurization reactor vertical supporting columns 132B is also four, so that the total number of the left desulfurization reactor vertical supporting columns 132A and the right desulfurization reactor vertical supporting columns 132B is eight.

Specifically, the grid-type support beam 133 may include a plurality of support beams extending in the left-right direction of the desulfurization reactor 11 and arranged at regular intervals in the front-rear direction of the desulfurization reactor 11 or a plurality of support beams extending in the front-rear direction of the desulfurization reactor 11 and arranged at regular intervals in the left-right direction of the desulfurization reactor 11. Such grid-type support beams 133 are particularly suitable for the rectangular reactor described above; and, it is advantageous to arrange in harmony with the internal structure of the desulfurization reactor 11.

Since the catalyst is supported in the desulfurization reactor 11 by the gas distribution support structure 118, and the gas distribution support structure 118 is a direct support for the desulfurization reactor bottom plate, the stress points between the gas distribution support structure 118 and the desulfurization reactor bottom plate can be distributed on the projection plane of the grid-type support beam 133 on the surface of the desulfurization reactor bottom plate, so that the force exerted on the desulfurization reactor bottom plate from the stress points between the gas distribution support structure 118 and the desulfurization reactor bottom plate produces a bending moment on the grid-type support beam 133 as small as possible.

Ingenious is, when grid formula supporting beam 133 includes many edges desulfurization reactor 11 left and right sides direction extends and follows desulfurization reactor 11 front and back direction evenly spaced arrangement's supporting beam or include many edges desulfurization reactor 11 front and back direction extends and follows desulfurization reactor 11 left and right sides direction evenly spaced arrangement's supporting beam, just in time be favorable to gas distribution bearing structure 118 with stress point between the desulfurization reactor bottom plate is in grid formula supporting beam 133 is in evenly arranged on the plane of projection of desulfurization reactor bottom plate surface. For example, when the gas distribution support structure 118 includes the columns 1181 arranged in a planar array on the desulfurization reactor bottom plate and the catalyst gas-permeable support structure supported above the columns 1181, the centers of the columns 1181 may be arranged in a rectangular array on the projection plane of the grid-type support beam 133 on the surface of the desulfurization reactor bottom plate (as shown in fig. 7), then the number of columns 1181 supported on each support beam is uniform, and thus, the distribution of the force applied to the desulfurization reactor bottom plate from the force-bearing point between the gas distribution support structure 118 and the desulfurization reactor bottom plate on the grid-type support beam 133 is completely uniform.

In addition, if the catalyst partition plate 16 is disposed above the gas distribution support structure inside the desulfurization reactor, and the catalyst partition plate 16 divides the catalyst placement layer into different rectangular catalyst placement cavities, the projection position of the stress point between the catalyst partition plate 16 and the gas distribution support structure 118 on the bottom plate surface of the desulfurization reactor can be distributed on the projection plane of the grid-type support beam 133 on the bottom plate surface of the desulfurization reactor.

In a first mode, when the catalytic flue gas desulfurization tower is constructed, the left desulfurization reactor column 11A and the right desulfurization reactor column 11B are arranged at an interval in the left-right width direction of the frame-type support structure 13 so as to form a piping installation region 135 in the middle of the frame-type support structure 13, and the exhaust manifold 151 is placed in the piping installation region 135. Because the left desulfurization reactor vertical column 11A and the right desulfurization reactor vertical column 11B are arranged at intervals in the left-right width direction of the frame-type supporting structure 13 to form a piping equipment installation region 135 in the middle of the frame-type supporting structure 13, and the exhaust main pipe 151 is placed in the piping equipment installation region 135, the space occupation in the front-rear direction of the catalytic flue gas desulfurization tower can be reduced.

Furthermore, the exhaust manifold 151 is located adjacent the rear side of the frame-like support structure 13 and may double as a chimney. On this basis, the output-side control pipe network 122 and/or the input-side control pipe network 123 may also be located in the plumbing installation area 135 and in front of the exhaust manifold 151. In this way, the piping arrangement of the regeneration liquid circulation system can be made more compact. Further, when the input-side control pipe network 123 is located in the piping equipment installation region 135 and in front of the exhaust manifold 151, the input-side manifold 1231 will be located between the left and right of the left desulfurization reactor column 11A and the right desulfurization reactor column 11B (as shown in fig. 6), and in this case, the pipe length of each input-side second branch 1234 connected to the input-side manifold 1231 can be shortened and the structure can be simplified. As shown in fig. 1, the input-side header pipe 1231 needs to be bent in the front-rear direction to form the above-described bent structure and then further bent in the left-right direction to be connected to the input-side header pipe 1231, and when the input-side header pipe 1231 is positioned between the left and right of the left desulfurization reactor column 11A and the right desulfurization reactor column 11B, the input-side second branch 1234 connected to each input-side header pipe 1231 needs to be bent in the left-right direction to form the above-described bent structure and then can be connected to the input-side header pipe 1231.

The regeneration liquid circulation system may include a plurality of regeneration liquid tanks 121, the plurality of regeneration liquid tanks 121 are horizontally arranged in parallel at the bottom of the frame-type support structure 13, the output-side control piping network 122 includes an output-side header pipe 1221 connected to the spray device of the desulfurization reactor 11 and output-side first branch pipes 1222 each connected between the output-side header pipe 1221 and a corresponding one of the regeneration liquid tanks 121, each output-side first branch pipe 1222 is provided with an output-side first control valve 1223, the regeneration liquid driver 124 is connected in series to the output-side header pipe 1221, the input-side control piping network 123 includes an input-side header pipe 1231 connected to the liquid discharge port 113 of the desulfurization reactor 11 and an input-side first branch pipe 1232 each connected between the input-side header pipe 1231 and a corresponding one of the regeneration liquid tanks 121, each input-side first branch pipe 1232 is provided with an input-side first control valve 1233, a return pipe 1224 is connected between the line on the output side of the regenerative liquid drive apparatus 124 in the output-side manifold 1221 and the input-side manifold, and a return pipe control valve 1225 is provided in the return pipe 1224.

In the first embodiment, each regeneration liquid tank 121 of the regeneration liquid circulation system is a custom-made stainless steel or glass fiber reinforced plastic container. The inner wall of each regeneration liquid tank can be paved with anticorrosive materials, such as acid-resistant bricks.

Thus, when the catalyst 114 in the selected desulfurization reactor 11 needs to be washed and regenerated, the gas inlet branch pipes 142 corresponding to the selected desulfurization reactor 11 are controlled to form a liquid seal, the output-side first control valve 1223 and the input-side first control valve 1233 corresponding to the regeneration liquid tank 121 storing the dilute sulfuric acid with the highest concentration in the plurality of regeneration liquid tanks 121 are opened, the dilute sulfuric acid in the regeneration liquid tank 121 storing the dilute sulfuric acid with the highest concentration is sent to one spraying unit of the regeneration liquid spraying device of the selected desulfurization reactor 11 through the corresponding output-side first branch pipe 1222, the regeneration liquid driving device 124 (usually a pump) and the output-side header pipe 1221, and the regeneration liquid after catalyst regeneration returns to the original regeneration liquid tank 121 from the input-side header pipe 1231 and the corresponding input-side first branch pipe 1232, then switching to another spraying unit; after the catalyst is washed and regenerated for a period of time by using the dilute sulfuric acid with the highest concentration, the output side first control valve 1223 and the input side first control valve 1233 corresponding to the regeneration liquid tank 121 storing the dilute sulfuric acid with the lower concentration by one stage in the plurality of regeneration liquid tanks 121 are opened again, and the catalyst is washed and regenerated again by using the same method; the above operations are repeated, and the catalyst can be washed and regenerated by dilute sulfuric acid or clean water with lower concentration. This enables the sulfuric acid on the active sites of the catalyst to be more sufficiently eluted, thereby improving the effect of regenerating the catalyst.

In the first mode, since the second openable/closable operation port 119B is disposed on the rear side corresponding to the catalyst-placing layer 116 while the first openable/closable operation port 119A is close to the rear side of the desulfurization reactor 11, the exhaust branch pipes in the catalytic flue gas desulfurization tower may be disposed: on the same floor of the frame-type support structure 13, the exhaust branch pipes 152 connected to the desulfurization reactors 11 belonging to the left desulfurization reactor column 11A and the exhaust branch pipes 152 connected to the desulfurization reactors 11 belonging to the right desulfurization reactor column 11B form a bilaterally symmetrical V-shaped structure and the exhaust port 112 of each desulfurization reactor 11 is located in front of the first openable/closable operation port 119A of the desulfurization reactor 112 (as shown in fig. 5). The V-shaped structure described above improves the uniformity of the gas pressure distribution inside the desulfurization reactor 11 even if the gas outlet 112 of the desulfurization reactor 11 is closer to the center of the top of the desulfurization reactor 11, and also provides an operation space for the gas to enter and exit the first openable and closable operation port 119A while ensuring that the length of the gas outlet branch pipe 152 is shorter.

Mode two

On the basis of the first mode, the frame-type support structure 13, the desulfurization reactors 11 on the frame-type support structure 13, and the regeneration liquid tank 121 included in the regeneration liquid circulation system are constructed as a reinforced concrete integrated structure, and the regeneration liquid tanks constitute the lower profile of the third rectangular body (as shown in fig. 6). Wherein, the concrete inner wall of the desulfurization reactor 11 and the inner wall of each regeneration liquid tank can be paved with anticorrosive materials, such as acid-resistant bricks.

Because the frame-type supporting structure 13, the desulfurization reactors 11 on the frame-type supporting structure 13 and the regeneration liquid tanks 121 contained in the regeneration liquid circulating system are built into a reinforced concrete integrated structure, the frame-type supporting structure 13, the desulfurization reactors 11 and the regeneration liquid tanks are built synchronously, the construction speed of the catalytic flue gas desulfurization tower is further increased, and the construction cost is reduced. Because the regeneration liquid groove is connected with the lower part of the frame type supporting structure into a whole, the integral strength and the stability of the catalytic flue gas desulfurization tower are further improved.

Wherein, the reinforced concrete integrated structure comprises a left desulfurization reactor vertical column 132A which is respectively positioned at four edges of a second rectangular body formed by the overall outline of the left desulfurization reactor vertical column 11A, a right desulfurization reactor vertical column 132B which is respectively positioned at four edges of a second rectangular body formed by the overall outline of the right desulfurization reactor vertical column 11B, a beam 134 (cross beam) connected between the left desulfurization reactor vertical column 132A and the right desulfurization reactor vertical column 132B, a grid-type support beam 133 arranged below the bottom plate of the desulfurization reactor 11, a shell of each desulfurization reactor 11 and shells and intermediate partitions of a plurality of regeneration liquid tanks 121 (used for separating a plurality of regeneration liquid tanks 121 in the shell). As can be seen from fig. 6, the housings of the plurality of regeneration liquid tanks constitute the lower contour of the third rectangular body.

Mode III

In addition to the first or second mode, when the catalytic flue gas desulfurization tower is constructed, the left desulfurization reactor vertical column 11A and the right desulfurization reactor vertical column 11B are connected together in a close contact manner, and the desulfurization reactors 11 on the floors of the frame-type support structure 13 in the left desulfurization reactor vertical column 11A and the desulfurization reactors 11 on the floors corresponding to the frame-type support structure 13 in the right desulfurization reactor vertical column 11B are separated by a common wall to form respective reactor cavities.

Mode three the piping installation area 135 is expanded into the desulfurization reactor 11 on the basis of mode one or mode two in order to load more catalyst. In addition, the desulfurization reactors 11 positioned on the floors of the frame-type supporting structure 13 in the left desulfurization reactor vertical column 11A and the desulfurization reactors 11 positioned on the floors corresponding to the frame-type supporting structure 13 in the right desulfurization reactor vertical column 11B are separated by a common wall to form respective reactor inner cavities, so that the use amount of concrete is reduced, and the construction cost of the catalytic flue gas desulfurization tower is saved.

In the third mode, the exhaust manifold 151 needs to be further moved backward, the output side control pipe network 122 can be moved forward to the front side of the frame-type supporting structure 13, and the input side control pipe network 123 can be moved backward to the rear side of the frame-type supporting structure 13. Even so, the second openable/closable operation port 119B can be disposed on the rear side corresponding to the catalyst-placing layer 116 while the first openable/closable operation port 119A is close to the rear side of the desulfurization reactor 11, and therefore, the exhaust branch pipes in the catalytic flue gas desulfurization tower can be disposed: on the same floor of the frame-type support structure 13, the exhaust branch pipe 152 connected to the desulfurization reactor 11 belonging to the left desulfurization reactor column 11A and the exhaust branch pipe 152 connected to the desulfurization reactor 11 belonging to the right desulfurization reactor column 11B form a bilaterally symmetrical V-shaped structure and the exhaust port 112 of each desulfurization reactor 11 is located on the front side of the first openable/closable operation port 119A of the desulfurization reactor 112.

In the third embodiment, an optional case is that the number of the left desulfurization reactor vertical supporting columns 132A is still four, the number of the right desulfurization reactor vertical supporting columns 132B is also four, and the number of the left desulfurization reactor vertical supporting columns 132A and the right desulfurization reactor vertical supporting columns 132B is still kept to be eight in total. Another alternative is that the two right-hand columns of the left-hand desulfurization reactor vertical support column 132A are the same as the two left-hand columns of the right-hand desulfurization reactor vertical support column 132B, respectively, such that the number of the left-hand desulfurization reactor vertical support column 132A and the right-hand desulfurization reactor vertical support column 132B is reduced to a total of six.

Mode IV

The frame-type support structure 13 is made of steel, and each desulfurization reactor 11 is made of a customized stainless steel or glass fiber reinforced plastic container. The frame-type support structure 13 and the desulfurization reactor 11 are separately constructed and subsequently assembled. Each regeneration tank also employs a custom-made stainless steel or glass reinforced plastic container. The concrete inner wall of the desulfurization reactor 11 and the inner wall of each regeneration liquid tank can be paved with anticorrosive materials, such as acid-resistant bricks.

The catalytic flue gas desulfurization apparatus of the present embodiment will be described below. It should be noted, however, that the following catalytic flue gas desulfurization apparatus and/or related technical contents can be applied to the above-mentioned catalytic flue gas desulfurization tower and/or desulfurization reactor, and can be applied to other catalytic desulfurization equipment.

Fig. 14 is a schematic view of an installation structure of a central pillar and a main beam of a catalytic flue gas desulfurization device according to an embodiment of the present application. Fig. 15 is a schematic view of an installation structure of a middle column and a main beam of a catalytic flue gas desulfurization device according to an embodiment of the present application. Fig. 16 is a schematic view of a secondary beam mounting structure in a catalytic flue gas desulfurization device according to an embodiment of the present application. Fig. 17 is a partially enlarged view at I in fig. 16. Fig. 18 is a schematic structural view of the main beam based on fig. 16, wherein acid-proof bricks are laid on the main beam at intervals along the length direction of the main beam. Fig. 19 is a schematic diagram of a positioning groove structure of a catalyst separator in a catalytic flue gas desulfurization device according to an embodiment of the present application. The internal structure of the desulfurization reactor, which is applicable to the above-described catalytic flue gas desulfurization tower in whole or in part, will be described with reference to fig. 10 to 19. It should be noted that the contents of fig. 14-19 are for example cylindrical reactors, but do not affect the overall or local application of the relevant internal structure in rectangular reactors.

As shown in fig. 10 to 19, a catalytic flue gas desulfurization device according to an embodiment of the present invention can be used in a catalytic flue gas desulfurization tower of the present application, and includes a desulfurization reactor 11 having at least one gas inlet 111, at least one gas outlet 112, at least one liquid outlet 113, and a catalyst 114 located in the desulfurization reactor, wherein a spray device of a regeneration liquid for washing and regenerating the catalyst 114 is disposed on the desulfurization reactor 11; when in desulfurization, flue gas enters the desulfurization reactor 11 from the gas inlet 111, is desulfurized through the catalyst 114 and then is discharged from the gas outlet 112, sulfur dioxide in the flue gas reacts on the catalyst 114 when passing through the catalyst 114 to form sulfuric acid, and when the catalyst 114 is washed and regenerated, the sulfuric acid enters the regeneration liquid sprayed on the catalyst 114 and then is discharged from the liquid outlet.

In the catalytic flue gas desulfurization device, the inside of the desulfurization reactor 11 is divided into a flue gas distribution layer 115, a catalyst placement layer 116 and a flue gas overflow layer 117 from bottom to top, a gas distribution support structure 118 is arranged in the flue gas distribution layer 115, the catalyst 114 is placed in the catalyst placement layer 116 above the gas distribution support structure 118, and during desulfurization, flue gas enters the flue gas distribution layer 115 from the gas inlet 111 and then dispersedly enters the flue gas overflow layer 117 from bottom to top through the catalyst 114 through the gas distribution support structure 118 and is discharged from the gas outlet 112.

Wherein the gas distribution support structure 118 comprises columns 1181 arranged in a planar array on the desulfurization reactor floor and a catalyst gas permeable support structure supported above the columns 1181, the catalyst gas permeable support structure comprising: a main beam layer 1182, where the main beam layer includes a plurality of main beams extending in a first horizontal direction and arranged at intervals in a second horizontal direction perpendicular to the first horizontal direction, and the main beams are divided into multiple sections of single-section main beams 1182A, and two ends of each single-section main beam 1182A are respectively clamped to different columns 1181; a secondary beam layer 1183, wherein the secondary beam layer 1183 is arranged above the main beam layer 1182 and includes a plurality of secondary beams extending in the second horizontal direction and arranged at intervals in the first horizontal direction, the secondary beams are divided into a plurality of sections of single-section secondary beams 1183A, one end of each single-section main beam 1183A is clamped on the corresponding main beam, and the other end of each single-section main beam 1183A is clamped on the corresponding main beam or the inner wall of the desulfurization reactor; and a catalyst supporting layer 1184, wherein the catalyst supporting layer 1184 is laid on the secondary beam layer 1183 and made of a gas permeable material, and is used for placing the catalyst 114.

Since the internals of the desulfurizer 11 are constructed after the outer shell of the desulfurizer 11 is constructed and fixed to the frame-type support structure 13, the columns 1181 and the catalyst permeable support structure are installed after the outer shell of the desulfurizer 11 is constructed and fixed to the frame-type support structure 13. Generally, after the outer shell of the desulfurization reactor is built, only corresponding openable and closable operation ports (commonly called as manholes in engineering) are reserved for workers to enter the desulfurization reactor for installing internal components of the desulfurization reactor, such as columns, main beams, secondary beams and the like. This is mainly because: if the desulfurization reactor is of a reinforced concrete structure, the shell of the desulfurization reactor is integrally cast and molded by concrete, if the desulfurization reactor adopts a glass fiber reinforced plastic or stainless steel container, a manufacturer can ship the glass fiber reinforced plastic or stainless steel container after the glass fiber reinforced plastic or stainless steel container is manufactured, and from the practical implementation point of view, a corresponding openable and closable operation port (commonly called a manhole in engineering) is reserved after the shell of the desulfurization reactor is built, so that workers can enter the desulfurization reactor to install the internal components of the desulfurization reactor, such as the upright column, the main beam, the secondary beam and the like, which is a reasonable scheme. Through dividing the girder into multistage single section girder 1182A and respectively the joint on different stand 1181 with the both ends of single section girder 1182A and divide the secondary beam into multistage single section girder 1183A and the joint of one end of single section girder 1183A on corresponding the girder and the other end joint on corresponding the girder or on the desulfurization reactor inner wall, because single section girder 1182A compares in girder length shorten lightweight and single section girder 1183A compares in secondary beam length shorten lightweight, like this, carry the degree of difficulty of single section girder 1182A and single section secondary girder 1183A to desulfurization reactor 11 and can greatly reduced, adopt the back workman's of joint degree of difficulty of setting up girder layer 1182 and secondary girder layer 1183 also can greatly reduced simultaneously. The clamping mode is adopted, so that the connection is convenient, and the connection strength is ensured.

Optionally, a main beam placing slot 1181A is formed in the top surface of the upright column 1181, and an end of the single-section main beam 1182A is clamped in the main beam placing slot 1181A corresponding to the top surface of the upright column 1181 (as shown in fig. 15). Preferably, acid-resistant bricks 17 are laid on the top surfaces of the columns 1181 and the top surfaces of the girder placement grooves 1181A, and then the end portions of the single girders 1182A are clamped in the girder placement grooves 1181A corresponding to the top surfaces of the columns 1181, so that the corrosion of sulfuric acid solution on the girder placement grooves 1181A can be prevented.

Optionally, the single-section main beam 1182A is formed by assembling at least two independent single-section main beam monomers, and the length of the single-section main beam monomer in the single-section main beam is the same as that of the single-section main beam (as shown in fig. 15, the single-section main beam 1182A is actually divided into two sections). Therefore, the weight of the single main beam can be further reduced, and the operation is convenient.

Optionally, acid-resistant bricks 17 are laid on the main beam at intervals along the length direction of the main beam, a first secondary beam placing slot 171 is formed between adjacent acid-resistant bricks 17 on the main beam, and the end of the single-section secondary beam 1183A is clamped in the corresponding first secondary beam placing slot 171 (as shown in fig. 18). Therefore, clamping of the end of the single-section secondary beam 1183A on the main beam is achieved.

Optionally, be equipped with interior flange 18 on the desulfurization reactor inner wall, be located on the desulfurization reactor inner wall interior flange top is along this interior flange circumference interval laying acidproof brick 17, forms second time roof beam along this interior flange 18 circumference interval laying between the adjacent acidproof brick 17 and places draw-in groove 172, the tip of single section secondary roof beam 1183A is placed on interior flange 18 and the joint is in corresponding second time roof beam and places draw-in groove 172 (as shown in fig. 16-17). Therefore, the clamping connection of the end part of the single-section secondary beam 1183A on the inner wall of the desulfurization reactor is realized.

Optionally, a buffer sealing material 19 is arranged between one end of the secondary beam close to the inner wall of the desulfurization reactor and the inner wall of the desulfurization reactor. The cushioning seal material 19 may be made of rubber.

Optionally, the catalyst support layer 1184 includes a grid made of PP material and an open-pore tetrafluoroethylene plate sequentially laid from bottom to top.

Preferably, the distance between any upright column 1181 of the upright columns 1181 arranged in a planar array on the bottom plate of the desulfurization reactor and the adjacent upright column 1181, the length of the single-section main beam 1182A and the length of the single-section secondary beam 1183A are both 800mm to 1800mm, and preferably 1000 mm to 1600 mm.

A catalyst partition plate 16 is placed above the gas distribution support structure 118 inside the desulfurization reactor 11, and the catalyst partition plate 16 divides the catalyst placement layer 116 into different catalyst placement cavities; the catalyst separator 16 includes a main plate 161 disposed along a first vertical plane and used for separating the catalyst-containing layer, and wing plates 162 disposed along a second vertical plane and connected to both sides of the main plate 161 and spaced apart along the length direction of the main plate.

In addition, the spraying device comprises a spraying unit which can independently spray the regeneration liquid to the catalysts in the different catalyst placing cavities.

Since the catalyst separator 16 includes the main plate 161 disposed along the first vertical plane and used for separating the catalyst containing layer and the wing plates 162 disposed along the second vertical plane and connected to both sides of the main plate 161 and spaced apart along the length direction of the main plate, the main plate 161 can be effectively prevented from being toppled by the catalyst when the catalyst is loaded by the supporting function of the wing plates 162 to the main plate 161. In addition, the wing plates 162 can alleviate the impact of the catalyst on the catalyst separator 16 in the vertical direction due to the rapid flow when the catalyst is poured into the catalyst-placing layer, preventing the main plate 161 from being broken or damaged.

Optionally, the wing plates 162 connected to the two sides of the main plate 161 are arranged symmetrically with respect to the main plate. In addition, the width of the wing plates 162 may gradually increase from top to bottom, for example, a trapezoid or a cone structure is formed between two wing plates 162 connected to two sides of the main plate 161 and arranged in plane symmetry with the main plate 161, so as to further improve the stability of the catalyst separator 16.

Optionally, the catalyst separator 16 further includes a bottom plate 163 disposed along a horizontal plane and simultaneously connected to the bottom surfaces of the main plate 161 and the wing plates 162 connected thereto, so as to further improve the stability of the catalyst separator 16.

Optionally, the catalyst separator 16 is assembled from teflon sheets. Alternatively, the catalyst separator 16 is formed by assembling inside the catalyst placement layer 116. The polytetrafluoroethylene board has strong acid corrosion resistance, light weight and high strength, and is very suitable for manufacturing the catalyst partition plate 16.

Besides, a grid-type support beam 133 is arranged below the desulfurization reactor bottom plate, and the stress points between the wing plates 162 and the gas distribution support structure 118 are distributed on the projection surface of the grid-type support beam 133 on the desulfurization reactor bottom plate surface at the projection position of the desulfurization reactor bottom plate surface.

The gas distribution support structure 118 may include columns 1181 arranged in a planar array on the desulfurization reactor bottom plate and a catalyst gas permeable support structure supported above the columns, the catalyst partition 116 is placed above the catalyst gas permeable support structure, the columns 1181 are distributed in an array on a projection plane of the grid-type support beam 133 on the desulfurization reactor bottom plate surface, and the projection positions of the stress points between the wing plates 162 and the catalyst gas permeable support structure on the desulfurization reactor bottom plate surface are distributed on a projection plane of the grid-type support beam on the desulfurization reactor bottom plate surface.

A catalyst partition plate 16 is placed above the gas distribution support structure 118 inside the desulfurization reactor 11, and the catalyst partition plate 16 divides the catalyst placement layer 116 into different catalyst placement cavities; the inner wall of the desulfurization reactor, at a position contacting the edge of the catalyst partition 116, is provided with a positioning groove 20 (as shown in fig. 19) adapted to be engaged with the edge of the catalyst partition so as to prevent the catalyst partition from moving to both sides of the catalyst partition.

Optionally, a corrosion-resistant material is paved on the inner wall of the desulfurization reactor and the positioning groove 20 is formed; preferably, gaps of acid-resistant tiles 17 are paved on the inner wall of the desulfurization reactor to form the positioning grooves.

Because the inner wall of the desulfurization reactor is provided with the positioning groove 20 which is in clamping fit with the edge of the catalyst partition plate and prevents the catalyst partition plate from moving to the two sides of the catalyst partition plate, the catalyst partition plate 116 can be effectively prevented from being extruded by the catalyst and toppled over through the positioning groove 20 when the catalyst is loaded.

On the premise of adopting the mode of paving the corrosion-resistant material on the inner wall of the desulfurization reactor and forming the positioning groove 20, when the corrosion-resistant material is paved, the corrosion-resistant material on the inner wall of the desulfurization reactor on one side of the catalyst partition plate 16 to be placed can be paved firstly, then the catalyst partition plate 16 is placed preliminarily, and finally the corrosion-resistant material on the inner wall of the desulfurization reactor on the other side of the catalyst partition plate 16 to be placed is paved, so that the positioning groove 20 can be formed to clamp the catalyst partition plate 16 in the positioning groove 20. Moreover, the operation mode is more convenient for workers to operate.

The catalytic flue gas desulfurization device provided by the embodiment of the application can be used in the catalytic flue gas desulfurization tower provided by the application, and comprises a desulfurization reactor, wherein the desulfurization reactor is provided with at least one air inlet, at least one air outlet, at least one liquid outlet and a catalyst positioned in the desulfurization reactor, and the desulfurization reactor is provided with a spray device for washing and regenerating regeneration liquid of the catalyst; and during desulfurization, flue gas enters the desulfurization reactor from the gas inlet, is desulfurized through the catalyst and then is discharged from the gas outlet, sulfur dioxide in the flue gas reacts on the catalyst to form sulfuric acid when passing through the catalyst, and the sulfuric acid enters regeneration liquid sprayed on the catalyst and is discharged from the liquid outlet when washing and regenerating the catalyst.

In the catalytic flue gas desulfurization device, the inside of a desulfurization reactor is divided into a flue gas distribution layer, a catalyst placing layer and a flue gas overflow layer from bottom to top, a gas distribution support structure is arranged in the flue gas distribution layer, the catalyst is placed in the catalyst placing layer above the gas distribution support structure, and during desulfurization, flue gas enters from a gas inlet into the flue gas distribution layer and then passes through the gas distribution support structure dispersedly and passes from bottom to top through the catalyst enters into the flue gas overflow layer and then is discharged from a gas outlet.

The desulfurization reactor is also provided with at least one first openable and closable operation port, at least one second openable and closable operation port and at least one third openable and closable operation port, wherein the first openable and closable operation port can be used for loading the catalyst into the desulfurization reactor, the second openable and closable operation port can be used for unloading the catalyst from the desulfurization reactor, and the third openable and closable operation port can be used for operating the gas distribution support structure.

And the gas inlet of the desulfurization reactor is arranged on the side surface of the flue gas distribution layer, the gas outlet and the first openable and closable operation port of the desulfurization reactor are arranged on the top surface of the flue gas overflow layer, the second openable and closable operation port of the desulfurization reactor is arranged on the side surface of the catalyst placement layer and is close to the bottom of the catalyst placement layer, the third openable and closable operation port of the desulfurization reactor is arranged on the side surface or the bottom surface of the flue gas distribution layer, and the liquid outlet of the desulfurization reactor is arranged on the bottom surface of the flue gas distribution layer.

Alternatively, in order to improve the convenience of catalyst loading and unloading, the orientation of the at least one first openable/closable operation port 119A is close to the orientation of the at least one second openable/closable operation port 119B. Alternatively, if the desulfurization reactor is contoured to form a first rectangular body, the at least one first openable/closable operation port 119A is provided at a position close to the side of the desulfurization reactor where the at least one second openable/closable operation port 119B is disposed; if the desulfurization reactor is configured as a cylinder, an angle between a line connecting the center of the at least one first openable/closable operation port 119A and the center of the cylinder and a line connecting the center of the at least one second openable/closable operation port 119B and the center of the cylinder is not more than 45 °.

Optionally, in order to improve the convenience of catalyst loading and unloading, the at least one second openable/closable operation port 119B is oriented away from the at least one intake port 111. Alternatively, if the desulfurization reactor is contoured to form a first rectangular body, the at least one second openable/closable operation port 119B is provided on a side opposite or aside to the side of the desulfurization reactor on which the at least one gas inlet port is disposed; if the desulfurization reactor is configured as a cylinder, an angle between a line connecting the center of the at least one second openable/closable operation port 119B and the center of the cylinder and a line connecting the center of the at least one gas inlet port 111 and the center of the cylinder is not less than 45 °.

In the catalytic flue gas desulfurization tower of the present application, a catalyst conveyer installation operation platform is disposed at the second openable/closable operation port 119B on the sidewall of the non-bottommost desulfurization reactor 11 in the left desulfurization reactor column and/or the right desulfurization reactor column, the catalyst conveying device mounting operation platform is used for mounting and operating the catalyst conveying device, the catalyst conveying device comprises a material receiving funnel 21 and a feeding pipe connected with the material receiving funnel 21, the receiving hopper 21 can be used for receiving the catalyst flowing out from the corresponding second openable/closable operation port 119B and also can be used for receiving the catalyst hoisted to the upper part of the receiving hopper, the feeding pipe can be connected to the first openable/closable operation port 119A on the top surface of the next-stage desulfurization reactor 11 or to a predetermined catalyst accumulation region (usually, a predetermined region on the ground).

Specifically, the receiving hopper 21 has an upper opening that can be aligned with the corresponding second openable/closable operation port 119B to receive the catalyst flowing out of the corresponding second openable/closable operation port 119B; in addition, because the catalyst conveying device is arranged above the operating platform without obstacles, the catalyst can also be lifted to the position above the opening by the lifting device. In this way, the receiving hopper 21 can be used for receiving the catalyst flowing out of the corresponding second openable/closable operation port 119B and also for receiving the catalyst lifted above the receiving hopper.

Optionally, the material receiving funnel and the feeding pipe may move relatively, when the feeding pipe moves to a first position, the feeding pipe is communicated to a first openable and closable operation opening 119A on the top surface of the next-layer desulfurization reactor 11, and when the feeding pipe moves to a second position, the feeding pipe is communicated to a preset catalyst accumulation area. Generally, the feeding pipe can be a flexible pipe, so that the feeding pipe can be communicated to the first openable operation port 119A on the top surface of the next layer of desulfurization reactor 11 and also communicated to the preset catalyst accumulation area.

Optionally, the catalyst conveying device installation operation platform is provided by a cantilever structure walkway on the side wall of the catalytic flue gas desulfurization tower. At this time, the position of the overhanging structure walkway can be designed accordingly to meet the above requirements.

Preferably, in the left desulfurization reactor column, the directions of the first openable and closable operation ports of the desulfurization reactors are the same, and the directions of the second openable and closable operation ports of the desulfurization reactors are the same; in the left desulfurization reactor which is vertically arranged, the position of an openable operation port is close to the position of a second openable operation port; and/or in the right desulfurization reactor vertical column, the directions of the first openable and closable operation ports of the desulfurization reactors are consistent, and the directions of the second openable and closable operation ports of the desulfurization reactors are consistent; in each of the desulfurization reactors arranged in the right-side desulfurization reactor column, the first openable/closable operation port is oriented close to the second openable/closable operation port.

Fig. 21 is a photograph showing a maintenance process of a catalytic flue gas desulfurization tower according to an embodiment of the present application. As shown in fig. 21, based on the layout of the first openable/closable operation port and the second openable/closable operation port in the catalytic flue gas desulfurization tower, a maintenance method of the catalytic flue gas desulfurization tower according to the embodiment of the present application can be implemented, where the maintenance method is used for maintenance of the catalytic flue gas desulfurization tower, and includes: after the catalyst in the desulfurization reactor on the Nth layer in the left desulfurization reactor vertical column and/or the right desulfurization reactor vertical column is removed, maintaining the desulfurization reactor on the Nth layer (for example, repairing or replacing the catalyst partition plate 16 and/or the catalyst bearing layer 1184), wherein N is an integer more than or equal to 1; and transferring the catalyst in the desulfurization reactor on the (N + 1) th layer to the desulfurization reactor on the Nth layer through the catalyst conveying device, and then maintaining the desulfurization reactor on the (N + 1) th layer. Based on the layout of the first openable/closable operation port and the second openable/closable operation port in the catalytic flue gas desulfurization tower, the orientation of the first openable/closable operation port 119A of the N +1 th-level desulfurization reactor is close to the orientation of the second openable/closable operation port 119B of the nth-level desulfurization reactor, so that the catalyst in the N +1 th-level desulfurization reactor can be transferred to the nth-level desulfurization reactor through the catalyst transfer device (the material receiving funnel and the feed pipe connected to the material receiving funnel 21).

The mode that the catalyst in the desulfurization reactor on the Nth layer in the left desulfurization reactor vertical column and/or the right desulfurization reactor vertical column is detached and then the desulfurization reactor on the Nth layer is maintained is adopted, then the catalyst in the desulfurization reactor on the (N + 1) th layer is transferred to the desulfurization reactor on the Nth layer through the catalyst conveying device and then the desulfurization reactor on the (N + 1) th layer is maintained, and compared with the original mode that the catalyst in the desulfurization reactors on all layers is detached to a catalyst accumulation area respectively and then is maintained and then is reloaded, the catalyst loading times can be saved, and therefore the maintenance cost is saved.

Fig. 22 is a schematic diagram of a regenerated liquid drainage structure of a catalytic flue gas desulfurization device according to an embodiment of the present application. Fig. 23 is a schematic partial structure diagram of a catalytic flue gas desulfurization tower according to an embodiment of the present application. Fig. 23 can reflect the regenerated liquid drainage structure and the cooling liquid spraying device of the catalytic flue gas desulfurization device. The regenerated liquid drainage structure of the catalytic flue gas desulfurization device is used for the catalytic flue gas desulfurization tower and is used as a regenerated liquid circulating system or rather as a part of an input side control pipe network. As shown in fig. 22 to 23, the regenerated liquid drainage structure of the catalytic flue gas desulfurization device includes a first drainage pipe (specifically, here, constituted by the input-side header pipe 1231) and a second drainage pipe (specifically, each input-side second branch 1234), the first drainage pipe is disposed from top to bottom, the upper end of the first drainage pipe is connected to the atmosphere through the air control valve 1231a, and the lower end of the first drainage pipe is connected to the regenerated liquid tank 121; the second liquid discharge pipe is arranged on the side surface of the first liquid discharge pipe and has a bent structure (i.e. a U-shaped liquid seal) which extends downwards, then turns back and extends upwards, one end of the second liquid discharge pipe is connected with the corresponding liquid discharge port 113, and the other end of the second liquid discharge pipe is connected with the wall of the first liquid discharge pipe. In addition, in the regenerated liquid drainage structure of the catalytic flue gas desulfurization device, when the ventilation control valve 1231a is opened to a set state, the first drainage pipe is communicated with the atmosphere environment and forms a first pressure environment in the first drainage pipe in the washing and regeneration process, and the first pressure environment can automatically maintain the regenerated liquid which enables the bent structure to form a liquid seal in the bent structure communicated with the first drainage pipe; when the ventilation control valve 1231a is closed to the set state, the first drain pipe is isolated from the atmosphere and forms a second pressure environment in the first drain pipe during the washing regeneration, and the second pressure environment can make the regeneration liquid in the bent structure communicated with the first drain pipe be automatically drawn into the regeneration liquid tank 121. The ventilation control valve 1231a may be a shutoff valve (e.g., a ball valve), a flow control valve, or the like.

When the regeneration liquid drainage structure is used for the catalytic flue gas desulfurization tower, the regeneration liquid drainage structure of the catalytic flue gas desulfurization device can control whether the second branch 1234 on each input side forms a liquid seal or not by adjusting the opening degree of the ventilation control valve 1231 a: when a liquid seal needs to be formed, the air ventilation control valve 1231a is opened to a set state, so that during the washing and regeneration process of a partial desulfurization reactor, the upper end of the input side header pipe 1231 is subjected to negative pressure breaking through the air ventilation control valve 1231a, the situation that the regeneration liquid flows in the input side header pipe 1231, negative pressure is generated in the input side header pipe 1231, liquid in the U-shaped liquid seal in each input side second branch 1234 except the input side second branch 1234 which discharges the regeneration liquid is extracted, and flue gas in the desulfurization reactor 11 which is in the desulfurization state leaks from the liquid discharge port 113 of the desulfurization reactor 11 is avoided, and when the washing and regeneration process is finished, the regeneration liquid which enables the bent structure to form the liquid seal is automatically maintained in the bent structure of the input side second branch 1234 which is used for discharging the regeneration liquid; when the liquid seal does not need to be formed, the ventilation control valve 1231a is closed to a set state, and a negative pressure state is formed in the input side header pipe 1231 during the washing and regeneration process of a part of the desulfurization reactors, so that the regeneration liquid in the U-shaped liquid seal in any one or more input side second branches 1234 communicated with the input side header pipe 1231 can be automatically pumped into the regeneration liquid tank, so as to perform maintenance and repair on the corresponding desulfurization reactor 11. Based on the above principle, it should be understood that when the ventilation control valve 1231a is closed to the set state to isolate the first exhaust pipe from the atmosphere, it does not necessarily mean that the first exhaust pipe is completely isolated from the atmosphere, i.e., "isolated" means relatively.

Generally, the pipe diameter of the input side header pipe 1231 is large, and if the ventilation control valve 1231a is directly attached to the upper end of the input side header pipe 1231, the specification of the selected ventilation control valve 1231a is also large, resulting in a high installation and use cost of the ventilation control valve 1231 a. Therefore, a design may be adopted in which: that is, a seal cover is attached to the upper end of the input-side header pipe 1231 to close the upper end of the input-side header pipe 1231, a gas guide pipe 1231b having a pipe diameter smaller than that of the input-side header pipe 1231 is attached to the seal cover, and the gas control valve 1231a is provided to the gas guide pipe 1231 b. It should be noted that the air-guide tube 1231b cannot have a tube diameter too small, otherwise even if the air-guide control valve 1231a is fully opened, a negative pressure is likely to be formed in the input-side manifold 1231. In short, the pipe diameter of the air duct 1231b and the specification of the ventilation control valve 1231a need to be selected reasonably, so that the upper end of the input side manifold 1231 can realize negative pressure breaking effect through the air duct 1231b and the ventilation control valve 1231a, and meanwhile, the installation and use cost of the ventilation control valve 1231a is greatly reduced because the pipe diameter of the air duct 1231b is smaller than that of the input side manifold 1231.

As a further improvement to the regenerated liquid discharge structure of the above catalytic flue gas desulfurization device, the pipe wall of the U-shaped liquid seal of the second liquid discharge pipe (i.e., each input-side second branch 1234) in the range close to the gas-liquid separation surface at the input end of the liquid seal pipe is made of plastic, and the plastic exhibits strength, chemical stability and thermal deformation temperature close to or better than those of polypropylene PP plastic when in use. Based on the discovery that the pipe wall of a metal material such as stainless steel and the like in the U-shaped liquid seal of the second branch 1234 on the input side, which is close to the gas-liquid separation surface at the input end of the liquid seal pipeline, is prone to corrosion, although this phenomenon and its cause are not disclosed, it is presumed that the gas-liquid separation surface in the U-shaped liquid seal, which is close to the input end of the liquid seal pipeline, simultaneously contacts a liquid containing a sulfuric acid solution (i.e., a regeneration liquid) and a gas containing sulfur oxides (i.e., flue gas) at a higher temperature, and the chemical corrosion and electrochemical corrosion conditions are superimposed, so that a plastic pipe meeting set requirements is used instead, and the corrosion problem can be effectively solved through practical use verification.

Optionally, the plastic is polypropylene PP plastic or polytetrafluoroethylene PTFE plastic. Preferably, the polypropylene PP plastic is glass fiber reinforced polypropylene (FRPP) plastic or polypropylene homopolymer (PPH) plastic. Compared with polypropylene PP plastic, the glass fiber reinforced polypropylene FRPP plastic or polypropylene homopolymer PPH plastic has certain improvement in strength and heat deformation temperature, and has obvious advantages in price compared with polytetrafluoroethylene PTFE plastic. Optionally, the second drain pipe is made of the plastic. Optionally, the first drain tube is also made of the plastic. Preferably, the pipe wall in the range of the gas-liquid separation surface in the U-shaped liquid seal comprises an inner layer and an outer layer of plastic which are processed by fusion welding, so that the corrosion resistance of the pipe wall in the range of the gas-liquid separation surface in the U-shaped liquid seal can be further improved, and the leakage prevention capability is enhanced. It is particularly emphasized here that it is the original practice of the inventor to form the inner and outer layers of the plastic on the pipe wall in the range of the gas-liquid separation surface in the U-shaped liquid seal by the welding process, and the specific positions of the inner and outer layers of the plastic are formed by the welding process, as shown in fig. 22, where the mark I corresponds to the arrow.

In the first mode, the left desulfurization reactor column 11A and the right desulfurization reactor column 11B are spaced apart from each other in the left-right width direction of the frame-type support structure 13 to form a piping equipment installation region 135 in the middle of the frame-type support structure 13, and the output-side control pipe network 122 and/or the input-side control pipe network 123 may be located in the piping equipment installation region 135. When the input-side control pipe network 123 is located in the piping installation region 135, the input-side header pipe 1231 will be located between the left and right sides of the left desulfurization reactor column 11A and the right desulfurization reactor column 11B (as shown in fig. 6), and in this case, the pipe length of each input-side second branch 1234 connected to the input-side header pipe 1231 can be shortened and the structure can be simplified. As shown in fig. 1, the input-side header pipe 1231 needs to be bent in the front-rear direction to form the above-mentioned bent structure and then further bent in the left-right direction to be connected to the input-side header pipe 1231, and when the input-side header pipe 1231 is located between the left and right of the left-side and right-side

desulfurization reactor columns

11A and 11B, the input-side second branches 1234 connected to the input-side header pipe 1231 can be connected to the input-side header pipe 1231 only by being bent in the left-right direction to form the above-mentioned bent structure (as shown in fig. 22), in which case, the pipe length of each input-side second branch 1234 is shortened, and the center line of each input-side second branch 1234 connected to the input-side header pipe 1231 and the center line of the input-side header pipe 1231 are located on the same vertical plane (as shown in fig. 23), so that the manufacture and installation of the input-side second branch 1234 are more convenient. In addition, as shown in fig. 22 to 23, the curved portion of each input-side second branch 1234 adopts a circular arc transition, and the curved structure in each input-side second branch 1234 is designed as a circular arc. The end of each input-side second branch 1234 connected to the corresponding liquid discharge port 113 is higher than the end connected to the pipe wall of the input-side header 1231.

During the operation of the catalytic flue gas desulfurization tower, part of the desulfurization reactor 11 is usually in the desulfurization state and part of the desulfurization reactor 11 is usually in the scrubbing regeneration state. Generally speaking, one desulfurization reactor 11 is reserved to be in the washing regeneration state, and the other desulfurization reactors 11 are in the desulfurization state; in this case, the pipe diameter of each input-side second branch 1234 connected to the input-side header 1231 may be designed to be equal to the pipe diameter of the input-side header 1231. When one of the desulfurization reactors 11 finishes the scrubbing regeneration state, it is switched to the desulfurization state, and accordingly, one of the desulfurization reactors 11 in the desulfurization state is switched to the scrubbing regeneration state. However, when the flue gas temperature is high (for example, the flue gas temperature in the coking industry is often as high as 180 ℃), if the desulfurization reactor 11 in the desulfurization state is directly switched to the washing and regeneration state to immediately wash and regenerate the catalyst in the desulfurization reactor 11, the catalyst is easily broken due to the large temperature difference between the front and the rear. Therefore, the method for washing and regenerating the catalyst of the catalytic flue gas desulfurization device is provided, and the technical problem that the catalyst is broken due to large temperature difference between the front and the rear can be solved by cooling the catalyst and then washing and regenerating the catalyst.

Fig. 24 is a schematic flow chart of a method for washing and regenerating a catalyst of a catalytic flue gas desulfurization device according to an embodiment of the present application. As shown in fig. 24, a method for washing and regenerating a catalyst of a catalytic flue gas desulfurization device specifically includes the following operations for a desulfurization reactor 11 to be switched to the washing and regenerating state:

step S11: and cutting off the gas inlet of the flue gas, and then introducing catalyst cooling gas with the temperature lower than the temperature of the flue gas during desulfurization into the desulfurization reactor, so that the catalyst cooling gas passes through the catalyst and carries heat in the catalyst, and then is discharged from the exhaust port.

Step S12: and starting the spraying device after the catalyst is cooled to the set condition, spraying the regenerated liquid to the catalyst through the spraying device so as to wash and regenerate the catalyst and discharge the regenerated liquid from the liquid outlet.

The catalyst cooling gas may be an inert gas such as nitrogen. The temperature of the catalyst cooling gas is generally from 10 ℃ to 80 ℃ and preferably from 15 ℃ to 70 ℃. Generally, the flow of the catalyst cooling gas is not less than the spray flow of the regeneration liquid during washing regeneration and not more than the flow of the flue gas inlet during desulfurization. Possibly, the heat exchanger can exchange heat between a process medium (such as flue gas to be desulfurized discharged from an industrial kiln) at the location of the catalytic flue gas desulfurization tower and the catalyst cooling gas so as to heat the catalyst cooling gas and then cool the catalyst by utilizing the heated catalyst cooling gas.

Generally, the set conditions are to cool the catalyst temperature to 80 ℃ or less, preferably to cool the catalyst temperature to within 30 ℃ above the regeneration liquid temperature.

The flue gas inlet passage can be used for introducing catalyst cooling gas into the desulfurization reactor. For example, a catalyst cooling gas delivery pipe may be connected to each of the inlet branches 142, and after the inlet of the flue gas in the selected inlet branch 142 is cut off (the inlet of the flue gas in the inlet branch 142 is cut off by a U-shaped liquid seal on the inlet branch 142), the catalyst cooling gas may be introduced into the corresponding desulfurization reactor 11 through the catalyst cooling gas delivery pipe.

According to the catalyst washing and regenerating method for the catalytic flue gas desulfurization device, the catalyst is cooled and then washed and regenerated, so that the technical problem that the catalyst is broken due to large front-back temperature difference can be solved. However, since this method uses a catalyst cooling gas, the catalyst cooling time is long when the catalyst cooling gas supply amount is relatively small (for example, for a desulfurization reactor in which the flue gas intake amount is several ten-thousand cubic meters per hour, when the flow rate of the catalyst cooling gas is 1000Nm for a single flue gas flow rate ³ The cooling time needs about 10 hours); on the other hand, if the catalyst cooling gas supply amount is relatively large, the catalyst cooling gas consumption amount and the energy consumption amount are both high.

For this purpose, another method for washing and regenerating the catalyst of the catalytic flue gas desulfurization device is provided. Fig. 25 is a schematic flow chart of a method for washing and regenerating a catalyst of a catalytic flue gas desulfurization device according to an embodiment of the present application. As shown in fig. 25, a method for washing and regenerating a catalyst of a catalytic flue gas desulfurization device specifically includes the following operations for a desulfurization reactor 11 to be switched to the washing and regenerating state:

step S21: and spraying cooling liquid into the gas inlet passage of the flue gas to cool the flue gas, introducing the cooled flue gas into the desulfurization reactor, and discharging the cooled flue gas from the gas outlet after the cooled flue gas passes through the catalyst and carries heat in the catalyst.

Step S22: and starting the spraying device after the catalyst is cooled to the set condition, spraying the regenerated liquid to the catalyst through the spraying device so as to wash and regenerate the catalyst and discharge the regenerated liquid from the liquid outlet.

Based on the foregoing, the air inlet branch pipe 142 has a bent structure (U-shaped liquid seal) extending downward, then turning back and extending upward, when the air inlet of the smoke in the selected air inlet branch pipe 142 needs to be cut off, the liquid is injected into the U-shaped liquid seal through the liquid inlet structure arranged on the corresponding U-shaped liquid seal, and when the air inlet of the smoke in the selected air inlet branch pipe needs to be conducted, the liquid in the U-shaped liquid seal is discharged through the liquid discharge structure arranged on the U-shaped liquid seal. Obviously, the liquid inlet structure and the liquid discharge structure are necessary for realizing the U-shaped liquid seal. In an alternative embodiment, a liquid storage tank 143 (generally storing water) is disposed at the top of the catalytic flue gas desulfurization tower, and the liquid storage tank 143 is connected to the liquid inlet structure of each air inlet branch pipe 142 through a pipeline, so that the liquid inlet structure can be modified into a cooling liquid spray device, so that the cooling liquid spray device can also be used as the liquid inlet structure. Through coolant liquid spray set to when spraying the coolant liquid and making flue gas cooling in the inlet channel of flue gas, simultaneously through the liquid discharge structure with the liquid discharge in the U-shaped liquid seal, at this moment, the flue gas still can get into desulfurization reactor through inlet branch 142 to, the flue gas receives the coolant liquid spray cooling when passing through inlet branch 142, and the temperature reduces, realizes catalyst cooling effect. In an alternative embodiment, the reservoir 143 is omitted and the regeneration fluid is used as the cooling fluid by directly leading from the regeneration fluid reservoir to a pipe connection inlet structure.

The catalyst washing and regenerating method for the catalytic flue gas desulfurization device shown in fig. 25 not only can solve the technical problem that the catalyst is broken due to large temperature difference between the front and the rear by cooling the catalyst and then washing and regenerating the catalyst, but also does not consume the cooling gas of the catalyst, and can still continuously perform flue gas desulfurization in the cooling process of the catalyst, so that the method has more advantages compared with the former method.

The contents related to the present application are explained above. Those of ordinary skill in the art will be able to implement the present application based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the description above without inventive step, shall fall within the scope of patent protection.

Claims

1. A regenerated liquid drainage structure of a catalytic flue gas desulfurization device comprises a desulfurization reactor, wherein the desulfurization reactor is provided with at least one air inlet, at least one air outlet, at least one liquid drainage port and a catalyst positioned in the desulfurization reactor, and the desulfurization reactor is provided with a spray device for washing and regenerating regenerated liquid for the catalyst;

when in desulfurization, flue gas enters a desulfurization reactor from the gas inlet, is desulfurized through a catalyst and then is discharged from the gas outlet, sulfur dioxide in the flue gas reacts on the catalyst to form sulfuric acid when passing through the catalyst, and when the catalyst is washed and regenerated, the sulfuric acid enters regeneration liquid sprayed on the catalyst and then is discharged from a liquid outlet;

it is characterized by comprising:

the first liquid discharge pipe is arranged from top to bottom, the upper end or the pipe wall of the first liquid discharge pipe is connected with the second liquid discharge pipe, and the lower end of the first liquid discharge pipe is connected with the regeneration liquid tank; and

the second liquid discharge pipe is arranged on the side surface of the first liquid discharge pipe and is provided with a bending structure which extends downwards, turns back and extends upwards, one end of the second liquid discharge pipe is connected with the corresponding liquid discharge port, and the other end of the second liquid discharge pipe is connected with the upper end or the pipe wall of the first liquid discharge pipe;

wherein, during the desulfurization, liquid is stored in the bent structure to form a liquid seal; the pipe wall of the liquid seal, in which the range of the gas-liquid separation surface close to the input end of the liquid seal pipeline is located, is made of plastic, and the strength, the chemical stability and the heat distortion temperature of the plastic are close to or better than those of polypropylene PP plastic when the plastic is used.

2. The regeneration liquid drainage structure of the catalytic flue gas desulfurization device of claim 1, characterized in that: the second liquid discharge pipe is made of the plastic.

3. The regeneration liquid drainage structure of a catalytic flue gas desulfurization device as recited in claim 2, characterized in that: the first drain tube is made of the plastic.

4. The regeneration liquid drainage structure of the catalytic flue gas desulfurization device of claim 1, characterized in that: the pipe wall in the range of the gas-liquid separation surface in the liquid seal comprises an inner layer and an outer layer of plastic which are processed by fusion welding.

5. The liquid discharging structure of the regenerated liquid of the catalytic flue gas desulfurization apparatus according to any one of claims 1 to 4, characterized in that: the plastic is polypropylene PP (polypropylene) plastic or polytetrafluoroethylene PTFE (polytetrafluoroethylene) plastic; the polypropylene PP plastic is preferably glass fiber reinforced polypropylene (FRPP) plastic or polypropylene homopolymer (PPH) plastic.

6. The liquid discharging structure of the regenerated liquid of the catalytic flue gas desulfurization apparatus according to any one of claims 1 to 4, characterized in that: the upper end of the first liquid discharge pipe is connected to the atmospheric environment through a ventilation control valve, and the pipe wall of the first liquid discharge pipe is connected with the second liquid discharge pipe;

when the ventilation control valve is opened to a set state, the first liquid discharge pipe is communicated with the atmosphere environment and forms a first pressure environment in the first liquid discharge pipe in the washing regeneration process, and the first pressure environment can automatically maintain the regeneration liquid which enables the bent structure to form a liquid seal in the bent structure communicated with the first liquid discharge pipe;

when the ventilation control valve is closed to a set state, the first exhaust pipe is isolated from the atmosphere and forms a second pressure environment in the first exhaust pipe during the washing regeneration process, and the second pressure environment can enable the regeneration liquid in the bent structure communicated with the first exhaust pipe to be automatically pumped into the regeneration liquid groove.

7. The regeneration liquid drainage structure of the catalytic flue gas desulfurization device of claim 6, wherein: the upper end of the first liquid discharge pipe is provided with a sealing cover, the sealing cover is provided with an air guide pipe of which the pipe diameter is smaller than that of the first liquid discharge pipe, and the air guide pipe is provided with an air control valve.

8. A catalytic flue gas desulfurization tower carries out flue gas desulfurization through a desulfurization reactor, wherein the desulfurization reactor is provided with at least one gas inlet, at least one gas outlet, at least one liquid outlet, a catalyst positioned in the desulfurization reactor and a spray device of regenerated liquid for washing and regenerating the catalyst;

it is characterized by comprising:

a left desulfurization reactor riser comprising at least two desulfurization reactors mounted in a vertical arrangement on respective support platforms on the left side of different floors of a frame-type support structure;

a right desulfurization reactor riser comprising at least two of the desulfurization reactors mounted in a vertical arrangement on support platforms on the right side of different floors of the frame-type support structure, respectively;

the air inlet pipe network comprises an air inlet main pipe and air inlet branch pipes, the air inlet main pipe is vertically arranged on the front side of the frame type supporting structure and is positioned between the left side desulfurization reactor vertical column and the right side desulfurization reactor vertical column, and the air inlet branch pipes enable the air inlet main pipe to be respectively connected with air inlets of the desulfurization reactors and are positioned on the front sides of the corresponding desulfurization reactors;

the exhaust pipe network comprises an exhaust main pipe vertically arranged between the left desulfurization reactor vertical column and the right desulfurization reactor vertical column and exhaust branch pipes which enable the exhaust main pipe to be respectively connected with the exhaust ports of the desulfurization reactors and are positioned above the corresponding desulfurization reactors; and

the system comprises a regeneration liquid circulating system and a regeneration liquid circulating system, wherein the regeneration liquid circulating system comprises at least one regeneration liquid tank and a regeneration liquid circulating control pipe network connected between the at least one regeneration liquid tank and each desulfurization reactor, the regeneration liquid circulating control pipe network is provided with an output side control pipe network, an input side control pipe network and a regeneration liquid driving device, the output side control pipe network can guide the regeneration liquid in the selected regeneration liquid tank into a regeneration liquid spraying device of the selected desulfurization reactor, the input side control pipe network can guide the regeneration liquid output from a liquid discharge port of the selected desulfurization reactor into the selected regeneration liquid tank, and the regeneration liquid driving device can provide required power for the regeneration liquid;

the output side control pipeline network comprises an output side main pipe, output side first branches and output side second branches, the output side first branches are respectively connected between the output side main pipe and a corresponding regeneration liquid tank, the output side second branches are respectively connected between the output side main pipe and a corresponding spraying device of a desulfurization reactor, output side first control valves are correspondingly arranged on the output side first branches, and the regeneration liquid driving equipment is connected on the output side main pipe in series;

the input side control pipe network comprises input side main pipes, input side first branches and input side second branches, the input side first branches are respectively connected between the input side main pipes and one corresponding regeneration liquid tank, the input side second branches are respectively connected between the input side main pipes and one corresponding liquid discharge port of the desulfurization reactor, and input side first control valves are correspondingly arranged on the input side first branches;

the regenerated liquid drainage structure of the catalytic flue gas desulfurization device according to any one of claims 1 to 7 is adopted, wherein the input side header pipe forms the first drainage pipe and is the input side header pipe, and the input side second branches respectively form the second drainage pipes.

9. The catalytic flue gas desulfurization tower of claim 6, wherein: the left desulfurization reactor vertical column and the right desulfurization reactor vertical column are arranged at intervals in the left-right width direction of the frame-type supporting structure, so that a pipeline equipment installation area is formed in the middle of the frame-type supporting structure, and the output side control pipe network and/or the input side control pipe network are/is located in the pipeline equipment installation area.

10. The catalytic flue gas desulfurization tower of claim 9, wherein: the center line of each input side second branch connected with the input side header pipe and the center line of the input side header pipe are located on the same vertical plane.