CN220589568U

CN220589568U - Denitration reactor

Info

Publication number: CN220589568U
Application number: CN202322195066.8U
Authority: CN
Inventors: 张�成; 王硕; 吴红; 周申燕; 白洋; 李佳乐
Original assignee: Sinoma Overseas Technology Development Co ltd
Current assignee: Sinoma Overseas Technology Development Co ltd
Priority date: 2023-08-15
Filing date: 2023-08-15
Publication date: 2024-03-15
Anticipated expiration: 2033-08-15

Abstract

The utility model relates to the technical field of denitration reactors, in particular to a denitration reactor, and aims to solve the problem that flue gas in the existing denitration reactor is unevenly distributed on a catalyst plate. For this purpose, a denitration reactor of the present utility model comprises: a reactor body in which a plurality of catalyst plates are disposed; a cover body arranged at the top of the reactor body; the air inlet pipe is connected with the cover body and is used for introducing flue gas into the cover body; the guide cylinder is arranged inside the cover body, and the diameter of the guide cylinder is gradually increased along the direction from the air inlet pipe to the reactor body. The utility model divides the flow of the flue gas introduced by the air inlet pipe and then sprays the split flow of the flue gas onto the catalyst plate, so that the flue gas can be uniformly sprayed on the central part and the edge part of the first layer of catalyst plate, the catalyst at the edge part is prevented from fully reacting when the central part of the catalyst plate fails, and the waste of the catalyst is effectively reduced.

Description

Denitration reactor

Technical Field

The utility model relates to the technical field of denitration reactors, and particularly provides a denitration reactor.

Background

The SCR denitration technology essentially removes nitrogen oxides from exhaust gas generated by fuel combustion, thereby achieving the purpose of sending the exhaust gas to polluted atmosphere. The SCR denitration technology is a selective catalytic reduction technology and has the advantages of high purification rate, compact process equipment, reliable operation, no secondary pollution and the like. In the denitration process, a denitration reactor is generally adopted for working, and when the flue gas enters the denitration reactor, whether the flue gas can be uniformly contacted with each layer of catalyst becomes a key of the purification efficiency of the denitration reactor.

At present, flue gas discharged into a reactor body by an air inlet pipe of the existing denitration reactor cannot uniformly enter a catalyst layer, so that the catalyst is not uniform and insufficient in reaction, and the waste of the catalyst is easily caused.

Accordingly, there is a need in the art for a new denitration reactor to solve the above problems.

Disclosure of Invention

The utility model aims to solve the technical problems that the flue gas discharged into a reactor body by an air inlet pipe of the existing denitration reactor cannot uniformly enter a catalyst layer, so that the catalyst reaction is not uniform and insufficient, and the waste of the catalyst is easily caused.

The present utility model provides a denitration reactor comprising:

a reactor body in which a plurality of catalyst plates are disposed;

a cover body arranged at the top of the reactor body;

the air inlet pipe is connected with the cover body and is used for introducing flue gas into the cover body;

a guide cylinder provided inside the cover body, the guide cylinder having a diameter gradually increasing in a direction from the air inlet pipe to the reactor body;

and the exhaust pipe is connected with the cover body and is used for exhausting the treated flue gas.

Under the condition of adopting the technical scheme, because the outlet area of the air inlet pipe is smaller than the inlet area of the reactor body, the air inlet pipe directly sprays flue gas to the surface of the catalyst plate, so that the flue gas can be intensively sprayed in the central area of the catalyst plate, and the catalyst content of each position of the catalyst plate is different in the long term, and finally waste is caused. The flue gas introduced from the air inlet pipe is split by the guide cylinder and then sprayed onto the catalyst plate, so that the flue gas can be uniformly sprayed on the central part and the edge part of the first layer of catalyst plate, and when the central part of the catalyst plate fails, the catalyst at the edge part is prevented from fully reacting, and the waste of the catalyst is effectively reduced.

Preferably, a plurality of guide cylinders are arranged, the guide cylinders are nested in sequence and coaxially arranged, and adjacent guide cylinders are connected through connecting pieces.

Under the condition of adopting the technical scheme, the guide cylinders are nested in sequence, so that multi-layer flow distribution of the smoke is realized, the flow distribution effect of the smoke is greatly improved, and the uniformity of the guide cylinders on the flow distribution of the smoke is improved.

Preferably, the air inlets of the guide barrels are flush with the air outlets of the guide barrels, and the distance from the air outlets of the guide barrels to the reactor body is gradually increased from outside to inside.

Under the condition of adopting the technical scheme, the flush air inlet can enable the flue gas to uniformly enter the diversion channel formed by mutually separating the diversion cylinders, so that the uniformity of flue gas diversion is further enhanced, and the diversion effect of the diversion cylinders on the flue gas is improved.

Preferably, the included angles between the inclined edges of the longitudinal sections of the guide barrels and the axes of the guide barrels are gradually reduced from outside to inside.

Under the condition of adopting the technical scheme, a guide flow channel is formed between guide flow cylinders formed between two adjacent guide flow cylinders, the longitudinal section of the guide flow channel is fan-shaped, the upper end face of the guide flow cylinder is correspondingly arranged with the air inlet pipe, the lower end face of the guide flow cylinder is correspondingly arranged with the air outlet pipe, and the guide flow cylinder can split the smoke sprayed out of the air inlet pipe.

Preferably, a plurality of the connecting pieces are provided, and the plurality of the connecting pieces are arranged at equal intervals along the circumferential direction of the guide cylinder.

Under the condition of adopting the technical scheme, the connecting piece is used for sequentially connecting the guide cylinders, connecting and fixing the guide cylinders, and forming a whole body.

Preferably, a support rod is connected between the outermost guide cylinder and the inner wall of the cover body.

Under the condition of adopting the technical scheme, the supporting rods are used for connecting and fixing the guide cylinder and the inner wall of the cover body, and the plurality of supporting rods can play a powerful stabilizing role on the guide cylinder due to the fact that the flow speed of flue gas sprayed by the air inlet pipe is high.

Preferably, a gap is reserved between the upper end face of the guide cylinder and the lower end face of the air inlet pipe, and a gap is reserved between the lower end face of the guide cylinder and the upper end face of the reactor body.

Under the condition of adopting the technical scheme, the guide cylinders are positioned in the middle of the cover body and are not directly connected with the air inlet pipe and the reactor body, so that the flue gas can be uniformly left along the inner side surface and the outer side surface of each guide cylinder, and the flow path of the flue gas is increased.

Preferably, the connecting piece is of a plate type structure.

Under the condition of adopting the technical scheme, the connecting piece with the plate-type structure can enhance the connection strength of a plurality of guide cylinders.

Preferably, the axis of the guide cylinder coincides with the axis of the air inlet pipe.

Under the condition of adopting the technical scheme, the air inlet of the guide cylinder is correspondingly arranged with the outlet of the air inlet pipe, so that the flue gas can uniformly enter the guide cylinder for diversion.

Preferably, the guide cylinder is conical.

Under the condition of adopting the technical scheme, the conical guide cylinder can be increased to the diversion area of the flue gas, so that the flue gas can be uniformly sprayed onto the catalyst plate. The draft tube of this application can guide the quick and even flow of flue gas to the catalyst board on, ensures that flue gas can be even with the catalyst through the catalyst board.

Drawings

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of a denitration reactor of the present utility model with a guide cylinder;

FIG. 2 is a schematic view of the exterior structure of the guide shell of the present utility model;

FIG. 3 is a schematic view of the internal structure of the guide cylinder of the present utility model.

The drawings are as follows:

1. a guide cylinder; 101. an outer guide shell; 102. a middle guide cylinder; 103. an inner guide shell; 2. a connecting piece; 3. a support rod; 4. a reactor body; 5. a cover body; 6. an air inlet pipe; 7. a catalyst plate; 8. and an exhaust pipe.

Detailed Description

Preferred embodiments of the present utility model are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present utility model, and are not intended to limit the scope of the present utility model. Those skilled in the art can adapt it as desired to suit a particular application.

It should be noted that, in the description of the present utility model, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directional or positional relationships, and are based on the directional or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the relevant devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the ordinal terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood by those skilled in the art according to the specific circumstances.

Referring to fig. 1, a denitration reactor disclosed herein includes a reactor body 4, a plurality of catalyst plates 7 are disposed inside the reactor body 4, each catalyst plate 7 is horizontally installed inside the reactor body 4, and the plurality of catalyst plates 7 are sequentially longitudinally arranged inside the reactor body 4. A cover body 5 is arranged on the upper part of the reactor body 4, a through hole is arranged on the upper part of the cover body 5, the cover body 5 is communicated with an air inlet pipe 6 through the through hole, and the bottom of the cover body 5 is directly communicated with the reactor body 4. The cover 5 has a hollow truncated cone shape or a hollow truncated pyramid shape. The guide cylinder 1 is arranged in the cover body 5, the diameter of the guide cylinder 1 gradually increases along the direction from the air inlet pipe 6 to the reactor body 4, and the guide cylinder 1 is also in a hollow truncated cone shape. An exhaust pipe 8 for discharging the treated flue gas is also arranged at the bottom of the reactor body 4.

When the flue gas to be treated actually works, the flue gas to be treated enters the cover body 5 from the air inlet pipe 6, the flue gas to be treated is split through the guide cylinder 1 in the cover body 5, during splitting, the flue gas to be treated flows to the first catalyst plate 7 along the inner side wall and the outer side wall of the guide cylinders 1, uniform splitting of the flue gas is realized, when the flue gas sequentially passes through the catalyst plates 7, catalytic reaction is carried out on the flue gas with the catalyst on the corresponding catalyst plate 7, harmful components of the flue gas are reduced or completely disappeared, and finally the treated flue gas flows out of the exhaust pipe 8.

Referring to fig. 2, it should be noted that a plurality of guide barrels 1 are provided, and in one implementation of the present application, for example, three guide barrels 1 are provided, and the three guide barrels 1 are sequentially referred to as an outer guide barrel 101, a middle guide barrel 102 and an inner guide barrel 103 from outside to inside according to the installation position. The upper end surfaces of the outer guide cylinder 101, the middle guide cylinder 102 and the inner guide cylinder 103, that is, the air inlets of the outer guide cylinder 101, the middle guide cylinder 102 and the inner guide cylinder 103 are flush, so that the flue gas sprayed by the air inlet pipe 6 uniformly enters the inner and outer walls of the three guide cylinders 1 and flows down along the inner and outer walls of the three guide cylinders 1. The distances between the exhaust ports of the outer guide cylinder 101, the middle guide cylinder 102 and the inner guide cylinder 103 and the reactor body 4 are gradually increased from outside to inside, so that the flue gas can be conveniently and uniformly sprayed onto the first catalyst plate 7 after being split by the three guide cylinders 1. The flue gas from the air inlet pipe 6 flows through the inner and outer side walls of the outer guide cylinder 101, the middle guide cylinder 102 and the inner guide cylinder 103 respectively, and the direction of the flue gas flow is changed through the inclined inner and outer side walls of the outer guide cylinder 101, the middle guide cylinder 102 and the inner guide cylinder 103, so that the flue gas is in more sufficient contact with the catalyst plate 7.

Referring to fig. 3, further, the angles between the oblique sides of the longitudinal sections of the outer guide cylinder 101, the middle guide cylinder 102 and the inner guide cylinder 103 and the axis of the guide cylinder 1 gradually decrease from outside to inside. The longitudinal sections of the diversion channels formed between two adjacent diversion cylinders 1 are fan-shaped, and the flue gas to be treated entering the diversion channels can be converged at the bottoms of the diversion channels, so that the flue gas is uniformly sprayed on the first catalyst plate 7. After the flue gas enters the guide cylinder 1, the flow direction of the flue gas can be changed according to the inclination angles of the side walls of the outer guide cylinder 101, the middle guide cylinder 102 and the inner guide cylinder 103, and meanwhile, the average flow speed of the flue gas can be slightly reduced, so that the impact force of the flue gas to be treated on the first catalyst plate 7 can be reduced.

The inclined sides of the longitudinal sections of the outer guide cylinder 101, the middle guide cylinder 102 and the inner guide cylinder 103 are in an angle range of 45 ° to 90 ° with respect to the axis thereof. The arrangement mode is beneficial to reducing the integral pressure loss of the denitration reactor, and can also effectively play a role in shunting. The integral pressure loss of the denitration reactor is small in the application, the fan in the denitration reactor does not need more energy to overcome the resistance of the guide cylinder 1 to the flow of smoke, the fan overload is avoided, and the energy consumption of the fan during operation is reduced.

Further, in order to enhance the connection strength of the outer guide cylinder 101, the middle guide cylinder 102 and the inner guide cylinder 103, a plurality of connection members 2 are additionally installed between the adjacent guide cylinders 1, and the plurality of connection members 2 are equally spaced along the circumferential direction of the guide cylinders 1. In one implementation of the present application, for example, three connectors 2 are disposed in each flow guiding channel, one side of each connector 2 of the first group is connected with the outer wall of the outer flow guiding cylinder 101, the other side of each connector 2 is connected with the inner wall of the middle flow guiding cylinder 102, one end of each connector 2 of the second group is connected with the inner wall of the middle flow guiding cylinder 102, and the other end of each connector 2 is connected with the outer wall of the inner flow guiding cylinder 103. The scheme can also only adopt three connecting pieces 2, and the one end and the inner wall of outside draft tube 101 of three connecting pieces 2 are connected, and the lateral wall of middle part draft tube 102 is run through at the middle part of connecting piece 2 to adopt welded mode to carry out the shutoff with the gap between connecting piece 2 and the middle part draft tube 102, the other end and the inside outer wall connection to draft tube 1 of connecting piece 2.

It should be noted that, the connecting piece 2 may have a rod-shaped structure or a plate-shaped structure, and taking a plate-shaped structure as an example, to enhance the connection effect of the connecting piece 2, one side edge of the connecting piece 2 connected to the outer wall of the inner guide cylinder 103 needs to be consistent with the length of the side edge of the outer wall of the inner guide cylinder 103, and the other side edge of the connecting piece 2 does not need to be consistent with the length of the side edge of the inner wall of the outer guide cylinder 101. The above-mentioned connecting piece 2 is configured to firmly fix the inner guide cylinder 103, the middle guide cylinder 102 and the outer guide cylinder 101 together, so that the outer guide cylinder 101, the middle guide cylinder 102 and the inner guide cylinder 103 form a whole.

Further, a plurality of support rods 3 are further arranged on the circumferential direction of the outer wall of the outer guide cylinder 101, the outer guide cylinder 101 is connected with the inner wall of the cover body 5 through the plurality of support rods 3, and the plurality of support rods 3 can effectively improve the connection strength of the whole guide cylinder 1 and the cover body 5. The supporting rod 3 is of a circular tube structure, so that the weight of the supporting rod 3 is greatly reduced, the weight of the whole guide cylinder 1 is further reduced, and the phenomenon that the guide cylinder 1 and the side wall of the cover body 5 are broken and slipped in denitration work is prevented.

In this application, the support rod 3 and the outer guide cylinder 101 are connected and fixed by welding, and the connecting piece 2 and the outer guide cylinder 101, the middle guide cylinder 102 and the inner guide cylinder 103 are also connected and fixed by welding.

When the guide cylinder 1 is assembled, in order to improve the flexibility of the guide cylinder 1, a worker can adjust the circle center positions of the outer guide cylinder 101, the middle guide cylinder 102 and the inner guide cylinder 103 according to the section flow velocity cloud picture of the air inlet pipe 6, so that the flue gas can be more uniformly sprayed on the catalyst plate 7.

The draft tube 1 of this application is comparatively simple in the aspect of the structure, and when the export of gas inlet tube 6 flows, can shunt in the inside and outside both sides of every draft tube 1, except that draft tube 1 self has certain inclination, when the flue gas flows along draft tube 1, does not have any extra blocking to the flue gas, both can make the quick flow direction catalyst plate 7 of flue gas, also can reduce the damage that the impact of flue gas to draft tube 1 caused to the whole cover body 5 and denitration reactor.

It should be further noted that, a gap is left between the upper end surface of the guide cylinder 1 and the lower end surface of the air inlet pipe 6, the distance of the gap is 300-500 mm, the upper end surface of the guide cylinder 1 is not level with the outlet level of the air inlet pipe 6, and the flue gas is ensured to uniformly flow into the guide cylinder 1. A gap is also present between the lower end face of the guide cylinder 1 and the upper end face of the reactor body 4, the distance of the gap being 1000-1200 mm. After the guide cylinder 1 is additionally arranged in the denitration reactor, the flue gas is in full contact with the catalyst, the denitration efficiency is higher, the manufacturing cost of the denitration reactor and the guide cylinder 1 is reduced, and the utilization rate of the catalyst is improved.

In another embodiment of the present application, after a period of use, the flue gas remains attached to the side walls of the reactor body 4, the cover 5, the air inlet pipe 6 and the guide cylinder 1. If the surface of the guide cylinder 1 is not cleaned, residues attached to the surface of the guide cylinder 1 can block the flow of the flue gas on the surface of the guide cylinder, so that the diversion effect of the guide cylinder 1 on the flue gas is not ideal. At this time, the interior of the denitration reactor, particularly the surface of the guide cylinder 1, needs to be cleaned periodically. In order to facilitate cleaning of the guide cylinder 1, a cleaning hole can be reserved on the side wall of the cover body 5, a cover plate matched with the side wall of the cover body 5 is additionally arranged on the side wall of the cleaning hole, and one side edge of the cover plate is connected with the side wall of the cover body 5 through a hinge, so that the cover plate can be opened in a rotating way.

Specifically, when need clear up the inner wall of the cover body 5, can open the apron, operating personnel uses the instrument to clear up the inner wall of the cover body through the clearance hole. Because the bottom of draft tube 1 leaves the clearance with cover body 5 bottom, consequently can offer the clearance hole on being close to the lateral wall of cover body 5 bottom, when the clearance cover body 5 inner wall, also can clear up the draft tube.

Thus far, the technical solution of the present utility model has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present utility model is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present utility model, and such modifications and substitutions will fall within the scope of the present utility model.

Claims

1. A denitration reactor, comprising:

a reactor body in which a plurality of catalyst plates are disposed;

a cover body arranged at the top of the reactor body;

2. A denitration reactor according to claim 1, wherein a plurality of guide cylinders are provided, a plurality of guide cylinders are nested in sequence and coaxially arranged, and adjacent guide cylinders are connected through connecting pieces.

3. The denitration reactor according to claim 1, wherein the air inlets of the plurality of guide cylinders are flush, and the distance between the air outlets of the plurality of guide cylinders and the reactor body is gradually increased from outside to inside.

4. The denitration reactor according to claim 1, wherein an angle between a sloping side of a longitudinal section of the plurality of guide cylinders and an axis of the guide cylinders is gradually reduced from outside to inside.

5. A denitration reactor according to claim 2, wherein a plurality of the connecting pieces are provided, and a plurality of the connecting pieces are arranged at equal intervals in the circumferential direction of the guide cylinder.

6. The denitration reactor according to claim 2, wherein a support rod is connected between the outermost guide cylinder and the inner wall of the cover.

7. The denitration reactor according to claim 1, wherein a gap is left between an upper end face of the guide cylinder and a lower end face of the air inlet pipe, and a gap is left between a lower end face of the guide cylinder and an upper end face of the reactor body.

8. The denitration reactor according to claim 6, wherein the connecting member is a plate type structure.

9. The denitration reactor according to claim 1, wherein an axis of the guide cylinder coincides with an axis of the intake pipe.

10. The denitration reactor according to claim 1, wherein the guide cylinder is tapered.