WO2020211829A1

WO2020211829A1 - Multi-stage dense phase semi-dry desulphurisation reactor

Info

Publication number: WO2020211829A1
Application number: PCT/CN2020/085246
Authority: WO
Inventors: 魏徵; 李谦; 姚亮; 袁胜利; 高慧妹
Original assignee: 中国恩菲工程技术有限公司
Priority date: 2019-04-17
Filing date: 2020-04-17
Publication date: 2020-10-22

Abstract

A multi-stage dense phase semi-dry desulphurisation reactor, comprising an inlet flue (1), an outlet flue (2), a plurality of U-shaped reactors (3), a plurality of desulphurisation agent adding assemblies (4), and a plurality of ash discharging valves (5), the plurality of U-shaped reactors (3) each being provided with a U-shaped flue gas channel (31), each U-shaped flue gas channel (31) being provided with an air inlet (311) and an air outlet (312), the plurality of U-shaped reactors (3) being arranged closely adjacently in sequence between the inlet flue (1) and the outlet flue (2), such that the U-shaped flue gas channels (31) are serially connected in sequence between the inlet flue (1) and the outlet flue (2); the plurality of desulphurisation agent adding assemblies (4) are respectively correspondingly arranged on the plurality of U-shaped reactors (3) and are correspondingly adjacent to the air inlet (311) of the plurality of U-shaped flue gas channels (31) in order to add desulphurisation agent into each U-shaped flue gas channel (31); and the plurality of ash discharging valves (5) are respectively correspondingly arranged on the plurality of U-shaped reactors (3) and are respectively correspondingly positioned at the bottommost position at the bottom of the plurality of U-shaped reactors (3). The present application achieves the implementation of multi-stage desulphurisation reactions in the same reactor, and has a compact structural layout and small floor occupation area.

Description

Multi-stage dense phase semi-dry desulfurization reactor

Cross references to related applications

This application requires the priority and rights of Chinese patent applications with application numbers 201910309911.5 and 201920525552.2, and the application date being April 17, 2019. The entire contents of the above Chinese patent applications are hereby incorporated into this application by reference.

Technical field

The embodiments of the application relate to the technical field of dense phase tower flue gas desulfurization technology, and in particular to a multi-stage dense phase semi-dry desulfurization reactor.

Background technique

The dense-phase semi-dry desulfurization technology is a mature semi-dry flue gas desulfurization process. The desulfurization device is generally set at the back end of the metallurgical furnace or boiler flue gas dust collector to remove SO ₂ , HCl and the flue gas. Pollutants such as HF are currently widely used in the treatment of metallurgical flue gas in steel mills and power plants and enter the field of non-ferrous flue gas treatment. The process is a semi-dry desulfurization process, which is mainly composed of desulfurization reactor, dust collector, induced draft fan, desulfurization ash circulation and storage, desulfurization agent humidification, electrical and automatic control, medium (air, water) transportation and other equipment. The desulfurization reactor is the core equipment of the entire process, generally cylindrical or rectangular box structure, the upper part of the tower is equipped with 3-5 sets of flue gas stirring devices, and the reactor is connected to ash transportation, humidification and other backup equipment. The single-stage desulfurization efficiency of the process can reach 80-90%.

However, the initial concentration of SO _{2 in} non-ferrous smelting flue gas such as copper, lead, and zinc is higher, reaching more than 6000mg/Nm ³ , flue gas volume and temperature fluctuate drastically, and the desulfurization efficiency is required to reach more than 95%, resulting in single-stage dense-phase semi-coherent The method process cannot meet the special emission limit requirements of non-ferrous smelting flue gas such as copper, lead and zinc. In order to meet the special emission limit requirements of non-ferrous smelting flue gas with high sulfur characteristics such as copper, lead, zinc, etc., multi-stage and semi-dry joint treatment is often used. The general plan is to use 2-3 sets of single-stage desulfurization reactors and independent ash conveying, stirring and other backup equipment to operate in series. This simple way of connecting desulfurization reactors in series has caused a series of problems such as doubling of auxiliary equipment such as ash conveying and stirring, increasing floor space and increasing investment.

Summary of the invention

This application aims to solve at least one of the technical problems existing in the prior art. For this reason, the embodiment of the present application proposes a multi-stage dense phase semi-dry desulfurization reactor, which realizes that the multi-stage desulfurization reaction is carried out in the same reactor, and can meet the characteristics of copper with SO ₂ ≥6000mg/m ³ high sulfur , Lead, zinc and other non-ferrous smelting flue gas special emission limit (≤100mg/m ³ ) requirements, and compact structure layout, small footprint, low equipment investment cost.

The multi-stage dense phase semi-dry desulfurization reactor according to the embodiment of the present application includes:

Inlet flue and outlet flue;

A plurality of U-shaped reactors are provided with a U-shaped flue gas channel, and each U-shaped flue gas channel is provided with an air inlet and an air outlet, and a plurality of the U-shaped reactors The device is arranged closely adjacently in turn between the inlet flue and the outlet flue, so that a plurality of U-shaped flue gas passages are sequentially connected in series between the inlet flue and the outlet flue, Wherein, in two adjacent U-shaped flue gas channels, the air outlet of the previous U-shaped flue gas channel is connected to the air inlet of the latter U-shaped flue gas channel, and a plurality of In the U-shaped flue gas channel, the air inlet of the first U-shaped flue gas channel communicates with the inlet flue, and the air outlet of the last U-shaped flue gas channel is connected to the outlet Flue connected;

A plurality of desulfurizing agent adding components are respectively arranged on the plurality of U-shaped reactors in one-to-one correspondence and adjacent to the inlets of the plurality of U-shaped flue gas channels in one-to-one correspondence. The gas port is used to add a desulfurizing agent to each of the U-shaped flue gas channels;

A plurality of ash unloading valves are respectively arranged on the plurality of U-shaped reactors in one-to-one correspondence and are respectively located at the bottom of the plurality of U-shaped reactors in a one-to-one correspondence.

According to the multi-stage dense-phase semi-dry desulfurization reactor of the embodiment of the application, the multi-stage desulfurization reaction is carried out in the same reactor to ensure that the desulfurized flue gas meets the relevant requirements and can meet the high SO2≥6000mg/m ³ The special emission limit (≤100mg/m ³ ) of non-ferrous smelting flue gas with characteristics of sulfur such as copper, lead and zinc. At the same time, the structural layout is compact, which effectively reduces the system footprint, reduces the number of spare equipment such as desulfurizer added components and ash unloading valves, and reduces equipment investment costs.

According to an embodiment of the present application, a plurality of the U-shaped reactors are arranged in a linear or L-shaped arrangement.

According to an embodiment of the present application, each U-shaped reactor includes a box body and a partition, the box body includes a side wall, a top wall and a bottom wall, and the side wall, the top wall and the bottom wall jointly form A box chamber, the upper end of the side wall is spaced apart with the air inlet and the air outlet communicating with the box chamber, the partition is vertically arranged in the box chamber, and the air inlet The port and the air outlet are located on both sides of the partition, and the upper and both sides of the partition are respectively fixed to the top wall and the side wall, so that the partition and the The box body defines the U-shaped flue gas passage.

According to a further embodiment of the present application, reinforcing ribs extending along the vertical direction are respectively provided on both sides of the partition.

According to a further embodiment of the present application, among the two adjacent U-shaped reactors, the part of the side wall of the former U-shaped reactor below the gas outlet and the latter U-shaped reactor The part of the side wall below the air inlet is closely connected.

According to a further embodiment of the present application, in two adjacent U-shaped reactors, the part of the side wall of the former U-shaped reactor below the gas outlet reacts with the latter U-shaped reactor The part of the side wall of the device below the air inlet is an integral wall.

According to a further embodiment of the present application, the bottom wall of each U-shaped reactor forms an ash hopper, and the ash unloading valve is arranged at the bottom of the ash hopper.

According to a further embodiment of the present application, the inclination angle of the ash hopper is ≥65°.

According to a further embodiment of the present application, an air flow aid is provided on the ash hopper of each U-shaped reactor.

According to an embodiment of the present application, it further includes a plurality of chain agitators, the plurality of chain agitators are respectively correspondingly arranged in a plurality of U-shaped flue gas channels, and the chain agitators are located in the desulfurizer Add below the component.

According to a further embodiment of the present application, the chain agitator is located 500-1000mm below the desulfurization agent adding component, and the stirring speed of the chain agitator is 120-240r/min to make the desulfurization agent and flue gas sufficient contact.

According to some embodiments of the present application, when the multi-stage dense phase semi-dry desulfurization reactor is working, the gas velocity of the flue gas in the U-shaped flue gas channel is 3-5 m/s, and the flue gas comes from multiple The residence time from the air inlet of the first U-shaped flue gas channel in the U-shaped flue gas channel to the air outlet of the last U-shaped flue gas channel is 6-8 s.

The additional aspects and advantages of the present application will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present application.

Description of the drawings

The above and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a schematic structural diagram of a multi-stage dense phase semi-dry desulfurization reactor according to an embodiment of the present application.

Fig. 2 is a schematic diagram of an L-shaped arrangement of the multi-stage dense-phase semi-dry desulfurization reactor in an embodiment of the present application.

Fig. 3 is a schematic diagram of a linear arrangement of the multi-stage dense-phase semi-dry desulfurization reactor in an embodiment of the present application.

FIG. 4 is a schematic diagram of the structure of the partition in the multi-stage dense phase semi-dry desulfurization reactor according to the embodiment of the present application.

Reference signs:

Multi-stage dense phase semi-dry desulfurization reactor 1000,

Inlet flue 1, outlet flue 2, U-shaped reactor 3, U-shaped flue gas channel 31, air inlet 311, air outlet 312, box 32, side wall 321, top wall 322, bottom wall (ash hopper) 323, partition 33, reinforcing rib 331, desulfurizing agent adding assembly 4, ash unloading valve 5, chain agitator 6, air flow aid 7.

detailed description

The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the application, but should not be understood as a limitation to the application. In the description of this application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The orientation or positional relationship indicated by “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, and “outer” are based on the orientation shown in the drawings or The positional relationship is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the application.

The following describes the multi-stage dense phase semi-dry desulfurization reactor 1000 according to an embodiment of the present application with reference to FIGS. 1 to 4.

As shown in Figure 1, the multi-stage dense phase semi-dry desulfurization reactor 1000 according to the embodiment of the present application includes an inlet flue 1, an outlet flue 2, multiple U-shaped reactors 3, and multiple desulfurizing agent adding components 4 And multiple ash unloading valves 5, multiple U-shaped reactors 3 are provided with U-shaped flue gas channels 31, each U-shaped flue gas channel 31 is provided with an air inlet 311 and an air outlet 312, multiple U-shaped reactors 3 are arranged closely adjacent to each other between the inlet flue 1 and the outlet flue 2, so that a plurality of U-shaped flue gas channels 31 are connected in series between the inlet flue 1 and the outlet flue 2 in sequence.

Wherein, in any two adjacent U-shaped flue gas channels 31, the air outlet 312 of the previous U-shaped flue gas channel 31 is in communication with the air inlet 311 of the next U-shaped flue gas channel 31. It should be noted here that the front and back are based on the flow direction of the flue gas. Among the two adjacent U-shaped flue gas channels 31, the U-shaped flue gas channel 31 through which the flue gas flows first is the previous U-shaped flue gas channel. 31. The U-shaped flue gas channel 31 into which the flue gas flows in is the latter U-shaped flue gas channel 31.

Among the multiple U-shaped flue gas channels 31, the air inlet 311 of the first U-shaped flue gas channel 31 communicates with the inlet flue 1, and the air outlet 312 of the last U-shaped flue gas channel 31 communicates with the outlet flue 2. It should be noted here that the first and last ones are based on the flow direction of the flue gas, and several are connected in series in the U-shaped flue gas channel 31 between the inlet flue 1 and the outlet flue 2. The flue gas is the most The U-shaped flue gas channel 31 that flows in first is the first U-shaped flue gas channel 31, and the U-shaped flue gas channel 31 into which the flue gas flows last is the last U-shaped flue gas channel 31.

A plurality of desulfurizing agent adding components 4 are respectively arranged on the plurality of U-shaped reactors 3 in one-to-one correspondence and are adjacent to the air inlets 311 of the plurality of U-shaped flue gas passages 31 in a one-to-one correspondence to each U-shaped flue gas passage. A desulfurizing agent is added in 31; a plurality of ash unloading valves 5 are respectively arranged on the plurality of U-shaped reactors 3 one-to-one and located at the bottom of the plurality of U-shaped reactors 3 one-to-one.

Specifically, the inlet flue 1 is used to input the flue gas to be desulfurized into the multi-stage dense phase semi-dry desulfurization reactor 1000, and the outlet flue 2 is used to transfer the gas in the multi-stage dense phase semi-dry desulfurization reactor 1000 The desulfurized flue gas output emissions.

Multiple U-shaped reactors 3 are provided with U-shaped flue gas channels 31, each U-shaped flue gas channel 31 is provided with an air inlet 311 and an air outlet 312, and multiple U-shaped reactors 3 are arranged closely adjacent to each other in turn Between the inlet flue 1 and the outlet flue 2, so that a plurality of U-shaped flue gas channels 31 are connected in series between the inlet flue 1 and the outlet flue 2 in sequence, wherein the exit of the previous U-shaped flue gas channel 31 The air port 312 communicates with the air inlet 311 of the latter U-shaped flue gas channel 31, the air inlet 311 of the first U-shaped flue gas channel 31 communicates with the inlet flue 1, and the air outlet of the last U-shaped flue gas channel 31 312 is connected to the exit flue 2. Therefore, by connecting a plurality of U-shaped flue gas channels 31 in series, the flue gas folds and reciprocates in the desulfurization reactor, so that the flue gas desulfurization reaction is sufficient, and the multi-stage desulfurization reaction is completed in the same reactor to ensure the desulfurized flue gas The gas meets the relevant requirements and can meet the special emission limit (≤100mg/m ³ ) of copper, lead, zinc and other non-ferrous smelting flue gas with SO2≥6000mg/m ³ high sulfur characteristics. In addition, a plurality of U-shaped reactors 3 are arranged closely adjacent to each other between the inlet flue 1 and the outlet flue 2, which is beneficial to the multi-stage dense-phase semi-dry desulfurization reactor 1000 with a compact overall structure and a small footprint. .

Optionally, the number of multiple U-shaped reactors 3 is two or three.

A plurality of desulfurizing agent adding components 4 are respectively arranged on the plurality of U-shaped reactors 3 in one-to-one correspondence and are adjacent to the air inlets 311 of the plurality of U-shaped flue gas passages 31 in a one-to-one correspondence to each U-shaped flue gas passage. Add desulfurizer such as lime powder to 31. Therefore, the desulfurizing agent adding module 4 can be arranged in a pair near the air inlet 311 of each U-shaped flue gas channel 31, which is conducive to expanding the effective flue gas desulfurization reaction zone, and adding the desulfurizing agent to the module 4 as a backup device The quantity is relatively reasonable, saving space and equipment investment costs.

A plurality of ash unloading valves 5 such as star-shaped ash unloading valves are respectively arranged on the plurality of U-shaped reactors 3 in one-to-one correspondence and are respectively located at the bottom of the plurality of U-shaped reactors 3 in a one-to-one correspondence. It can be understood that during the desulfurization reaction, the desulfurization product particles such as calcium sulfide particles or other material particles such as desulfurization agent produced by the reaction of the flue gas with the desulfurization agent such as lime powder, due to the relatively heavy specific gravity of these materials, fall on the bottom of the U-shaped flue gas channel 31 , Through the ash unloading valve 5 arranged at the bottom of the U-shaped reactor 3, it can be easily discharged. In addition, the number of ash unloading valves 5 as backup equipment is relatively reasonable, which saves floor space and equipment investment costs.

According to the multi-stage dense-phase semi-dry desulfurization reactor 1000 according to the embodiment of the application, the multi-stage desulfurization reaction is carried out in the same reactor to ensure that the desulfurized flue gas meets relevant requirements and can meet SO2≥6000mg/m ³ The special emission limit (≤100mg/m ³ ) of non-ferrous smelting flue gas with high sulfur characteristics such as copper, lead and zinc. At the same time, the structural layout is compact, which effectively reduces the system footprint, reduces the number of spare equipment such as the desulfurizing agent added to the assembly 4 and the ash unloading valve 5, and reduces the equipment investment cost.

As shown in FIGS. 1 to 3, according to an embodiment of the present application, a plurality of U-shaped reactors 3 are arranged in a straight line or an L-shape. Therefore, the linear arrangement or the L-shaped arrangement can be flexibly selected according to the use space, and the orientation of the inlet flue 1 and the outlet flue 2 is also flexible.

As shown in Figure 1, according to an embodiment of the present application, each U-shaped reactor 3 includes a box body 32 and a partition 33. The box body 32 includes a side wall 321, a top wall 322, and a bottom wall 323. The side walls 321, The top wall 322 and the bottom wall 323 jointly form a box chamber. The upper end of the side wall 321 is spaced apart with an air inlet 311 and an air outlet 312 communicating with the box chamber. The partition 33 is vertically arranged in the box chamber and allows the inlet The air ports 311 and the air outlets 312 are located on both sides of the partition 33, and the upper and both sides of the partition 33 are fixed to the top wall 322 and the side wall 321, respectively, so that the partition 33 and the box body 32 define U-shaped flue gas channel 31.

Specifically, the box body 32 may be a box-shaped cuboid, the size of the box body 32 may be designed according to site conditions, each U-shaped reactor 3 has a box-shaped cuboid structure, and the size of the box body 32 is designed according to the site conditions. Optionally, the box body 32 of each U-shaped reactor 3 is made of ordinary carbon steel, which is cheap. Optionally, the wall thickness of the box body 32 is greater than or equal to 5 mm to ensure the necessary strength of the box body 32 of each U-shaped reactor 3 to ensure the safe use of the multi-stage dense phase semi-dry desulfurization reactor 1000.

The shape of the partition 33 can be selected according to the actual situation. For example, when the box body 32 is a box-shaped cuboid, the partition 33 may be a rectangle and be fixed in the U-shaped reactor 3 by welding. Optionally, the partition 33 is made of ordinary carbon steel, which is cheap. The wall thickness of the partition 33 is ≥5mm to ensure the necessary strength of the partition 33 in each U-shaped reactor 3, thereby ensuring the multi-stage dense phase and semi-dryness. FGD reactor 1000 is safe to use.

As shown in FIG. 4, according to a further embodiment of the present application, reinforcing ribs 331 extending vertically are respectively provided on both sides of the partition 33. By providing the reinforcing ribs 331 extending in the vertical direction, on the one hand, the strength of the partition 33 can be increased, and on the other hand, it is possible to prevent the reaction product particles from attaching to the reinforcing ribs 331.

Specifically, the reinforcing rib 331 may be flat steel with a width and a thickness of 50 mm and 5 mm, respectively. There may be multiple reinforcing ribs 331 plates, which are vertically welded on both sides of the partition 33 at intervals of 500-1000 mm to better increase the strength of the partition 33.

As shown in Figure 1, according to a further embodiment of the present application, in two adjacent U-shaped reactors 3, the side wall 321 of the first U-shaped reactor 3 below the gas outlet 312 and the latter U-shaped reactor The side wall 321 of 3 is closely connected below the air inlet 311. Therefore, it is advantageous for the structure arrangement of the multi-stage dense-phase semi-dry desulfurization reactor 1000 to be compact and to save floor space.

According to a further embodiment of the present application, in two adjacent U-shaped reactors 3, the part of the side wall 321 of the former U-shaped reactor 3 below the gas outlet 312 and the side wall 321 of the latter U-shaped reactor 3 The part below the air inlet 311 is an integral wall, that is, the air outlet 312 of the previous U-shaped reactor 3 coincides with the air inlet 311 of the latter U-shaped reactor 3 and the previous U-shaped reactor 3 The part of the side wall 321 below the gas outlet 312 and the part of the side wall 321 of the latter U-shaped reactor 3 below the gas inlet 311 are integrally formed walls. From this, it can be understood that multiple U-shaped reactors 3 are One-piece molded part, the overall structure is simple and compact, and the space is small.

According to a further embodiment of the present application, the bottom wall 323 of each U-shaped reactor 3 forms an ash hopper 323, and the ash unloading valve 5 is arranged at the bottom of the ash hopper 323, thereby facilitating the concentration of desulfurization product particles and other substances by their own weight Move to the bottom of the ash hopper 323 to facilitate the discharge of desulfurization product particles and other substances.

According to a further embodiment of the present application, the inclination angle of the ash hopper 323 is ≥65°. Therefore, the use of a large inclination ash hopper 323 can prevent the ash hopper wall from being bonded by the desulfurizing agent and the desulfurizing product, which will damage the normal use function of the multi-stage dense phase semi-dry desulfurization reactor 1000.

According to a further embodiment of the present application, the ash hopper 323 of each U-shaped reactor 3 is provided with an air flow aid 7 so as to prevent the ash hopper wall from being bonded by the desulfurizing agent and the desulfurizing product on the one hand, and the other On the one hand, it enhances the fluidity of the desulfurizer.

According to an embodiment of the present application, the desulfurizing agent adding assembly 4 adjacent to the air inlet 311 of the first U-shaped flue gas channel 31 is a desulfurizing agent delivery pipe that uses gas to transport the desulfurizing agent, and the remaining desulfurizing agent is added to the assembly 4 It is a desulfurizer humidifier. Therefore, it is beneficial to facilitate the delivery of the desulfurizing agent into the U-shaped air inlet channel.

According to an embodiment of the present application, it further includes a plurality of chain agitators 6, which are respectively correspondingly arranged in the plurality of U-shaped flue gas passages 31, and the chain agitators 6 are located in the desulfurizing agent adding assembly 4 below. On the one hand, making the flue gas and the desulfurizer fully contact and mix is beneficial to improve the flue gas desulfurization rate, and can meet the special emission limit of copper, lead, zinc and other non-ferrous smelting flue gas with high sulfur characteristics of SO2≥6000mg/m ³ (≤100mg /m ³ ), on the other hand, particles can be prevented from sticking to the chain stirrer 6 during the stirring process. In addition, each U-shaped reactor 3 corresponds to a set of chain agitators 6, which avoids the addition of ash conveying, stirring and other spare equipment and investment in simple series desulfurization reactors.

According to a further embodiment of the present application, the chain agitator 6 is located 500-1000mm below the desulfurizer adding component 4, and the stirring speed of the agitator is 120-240r/min, so that the desulfurizer and flue gas are fully contacted and mixed, which is beneficial to improve The flue gas desulfurization rate is beneficial to meet the special emission limit (≤100mg/m ³ ) of non-ferrous smelting flue gas such as copper, lead, zinc and other non-ferrous smelting flue gas with SO2≥6000mg/m ³ high sulfur characteristics. Specifically, each U-shaped reactor 3 corresponds to a set of chain agitators 6, which avoids the addition of ash conveying, stirring and other spare equipment and investment in a simple series desulfurization reactor.

According to some embodiments of the present application, when the multi-stage dense phase semi-dry desulfurization reactor 100 is working, the gas velocity of flue gas in the U-shaped flue gas channel 31 is 3 to 5 m/s, and the flue gas flows from multiple U-shaped edges. The residence time from the air inlet 311 of the first U-shaped flue gas channel 31 to the air outlet 312 of the last U-shaped flue gas channel 31 in the channel 31 is 6-8s. Therefore, it is beneficial to improve the flue gas desulfurization rate, and is beneficial to meet the special emission limit (≤100mg/m ³ ) of non-ferrous smelting flue gas such as copper, lead, zinc and other non-ferrous smelting flue gas with SO ₂ ≥6000mg/m ³ high sulfur characteristics.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean specific features described in conjunction with the embodiment or example , The structure, materials, or characteristics are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples and the characteristics of the different embodiments or examples described in this specification without contradicting each other.

In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless specifically defined otherwise.

In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , Or integrated; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication of two components or the interaction relationship between two components, Unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In this application, unless expressly stipulated and defined otherwise, the “on” or “under” of the first feature on the second feature may be in direct contact with the first and second features, or indirectly through an intermediary. contact. Moreover, the "above", "above" and "above" of the first feature on the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the level of the first feature is higher than the second feature. The “below”, “below” and “below” of the second feature of the first feature may mean that the first feature is directly below or obliquely below the second feature, or it simply means that the level of the first feature is smaller than the second feature.

Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limiting the present application. A person of ordinary skill in the art can comment on the foregoing within the scope of the present application. The embodiment undergoes changes, modifications, substitutions and modifications.

Claims

A multi-stage dense phase semi-dry desulfurization reactor is characterized in that it comprises:

Inlet flue and outlet flue;

A plurality of U-shaped reactors, each of the U-shaped reactors is provided with a U-shaped flue gas channel, each U-shaped flue gas channel is provided with an air inlet and an air outlet, and a plurality of the U-shaped reactors Are arranged closely adjacent to each other between the inlet flue and the outlet flue, so that a plurality of U-shaped flue gas channels are connected in series between the inlet flue and the outlet flue, wherein , In the two adjacent U-shaped flue gas channels, the air outlet of the previous U-shaped flue gas channel communicates with the air inlet of the latter U-shaped flue gas channel, and a plurality of the In the U-shaped flue gas channel, the air inlet of the first U-shaped flue gas channel communicates with the inlet flue, and the air outlet of the last U-shaped flue gas channel is connected to the outlet flue. Road connection

A plurality of desulfurizing agent adding components are respectively arranged on the plurality of U-shaped reactors in one-to-one correspondence and adjacent to the inlets of the plurality of U-shaped flue gas channels in one-to-one correspondence. The gas port is used to add a desulfurizing agent to each of the U-shaped flue gas channels;

A plurality of ash unloading valves are respectively arranged on the plurality of U-shaped reactors in one-to-one correspondence and are respectively located at the bottom of the plurality of U-shaped reactors in a one-to-one correspondence.
The multi-stage dense phase semi-dry desulfurization reactor according to claim 1, wherein a plurality of U-shaped reactors are arranged in a straight line or an L-shaped arrangement.
The multi-stage dense-phase semi-dry desulfurization reactor according to claim 1 or 2, wherein each of the U-shaped reactors includes a box body and a partition, and the box body includes a side wall, a top wall and The bottom wall, the side walls, the top wall and the bottom wall jointly form a box chamber, the upper end of the side wall is spaced apart with the air inlet and the air outlet communicating with the box chamber, the The partition is vertically arranged in the chamber, the air inlet and the air outlet are located on both sides of the partition, and the upper and both sides of the partition are respectively connected to the top The wall and the side wall are fixed, so that the partition and the box body define the U-shaped flue gas passage.
The multi-stage dense phase semi-dry desulfurization reactor according to claim 3, wherein the two sides of the partition are respectively provided with reinforcing ribs extending along the vertical direction.
The multi-stage dense-phase semi-dry desulfurization reactor according to claim 3, wherein in two adjacent U-shaped reactors, the side wall of the previous U-shaped reactor is at the gas outlet The following part is closely connected with the part of the side wall of the latter U-shaped reactor below the air inlet.
The multi-stage dense-phase semi-dry desulfurization reactor according to claim 3 or 5, wherein in two adjacent U-shaped reactors, the side wall of the previous U-shaped reactor is The part below the air outlet and the part of the side wall of the latter U-shaped reactor below the air inlet are integrally formed walls.
The multi-stage dense phase semi-dry desulfurization reactor according to any one of claims 3-6, wherein the bottom wall of each U-shaped reactor forms an ash hopper, and the ash unloading valve Set at the bottom of the ash hopper.
The multi-stage dense phase semi-dry desulfurization reactor according to claim 7, wherein the inclination angle of the ash hopper is greater than or equal to 65°.
The multi-stage dense phase semi-dry desulfurization reactor according to claim 7, wherein the ash hopper of each U-shaped reactor is provided with an air flow aid.
The multi-stage dense phase semi-dry desulfurization reactor according to any one of claims 1-9, further comprising a plurality of chain agitators, and the plurality of chain agitators are respectively arranged in the A U-shaped flue gas channel, and the chain agitator is located below the desulfurizing agent adding component.
The multi-stage dense-phase semi-dry desulfurization reactor according to claim 10, wherein the chain agitator is located 500-1000 mm below the desulfurizing agent adding component, and the stirring speed of the chain agitator It is 120-240r/min, so that the desulfurizer and flue gas are in full contact.
The multi-stage dense-phase semi-dry desulfurization reactor according to any one of claims 1-11, wherein when the multi-stage dense-phase semi-dry desulfurization reactor is working, the flue gas is in the U-shaped The gas velocity in the flue gas channel is 3-5m/s, and the flue gas flows from the air inlet of the first U-shaped flue gas channel of the plurality of U-shaped flue gas channels to the last U-shaped flue gas channel. The residence time of the air outlet of the flue gas channel is 6-8s.