Steam boiler denitration system
By using a rotating dispersing frame and inclined spray pipe in the steam boiler denitrification system, combined with the rotating shaft and cleaning brush assembly, the problems of catalyst blockage and water spraying mechanism blockage under low temperature conditions are solved, and the full contact between nitrogen water and flue gas and denitrogenation are achieved. The effective progress of the reaction improves the stability and safety of the system.
Patent Information
- Application Number
- CN202420713955.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-09
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-04-09
AI Technical Summary
The existing steam boiler denitrification system can easily lead to catalyst blockage and reaction rate reduction under low temperature conditions, and the fixed nozzle of the water spray mechanism is easily blocked, affecting the contact between nitrogen water and flue gas, resulting in poor denitrification effect.
A steam boiler denitrification system consisting of a rotary dispersion frame and an inclined spray pipe is designed to ensure that the nitrogen water and flue gas are fully mixed through the connecting pipe and the hollow pipe, and the filter cartridge is automatically cleaned through the rotary shaft, blade and cleaning brush assembly to ensure spraying. The hole is unobstructed.
It realizes sufficient contact between nitrogen water and flue gas under low temperature conditions, ensures the effective progress of the denitrification reaction, avoids catalyst blockage and rises in reactor pressure difference, and improves the stability and safety of the system.
Smart Images
Figure CN222173662U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of steam boilers, in particular to a steam boiler denitration system. Background Art
[0002] During the startup of the unit, due to the small amount of boiler fuel in the initial stage and the low combustion heat load in the furnace, the unit is below 40% of the rated load (264MW) after being put into production, and the inlet and outlet flue gas temperatures of the denitrification system are both below 300°C. The denitrification system is subject to the catalytic reaction temperature limit and is set with a minimum operating temperature (313°C). When the inlet and outlet flue gas temperatures of the denitrification system are lower than the minimum temperature (313°C), the denitrification system is restricted from being put into operation or is protected from exiting.
[0003] If the flue gas temperature is lower than the optimal reaction temperature of the catalyst and the denitration system is forced into operation, the denitration reaction rate will be greatly reduced. If excessive ammonia is injected to control nitrogen oxides, the ammonia concentration in the tail flue will increase, ammonia escape will increase, and the sulfur trioxide concentration will increase. Ammonia and sulfur trioxide will generate ammonium bisulfate at a flue gas temperature of 200-300°C. This is a viscous substance that will adhere to the denitration catalyst and air preheater and absorb dust, causing the denitration catalyst and air preheater to be blocked, and the pressure difference between the denitration reactor and the air preheater to increase, thereby reducing the output of the induced draft fan or forcing it to shut down, seriously threatening the safe operation of the unit.
[0004] When the existing denitrification equipment is in use, a water spraying mechanism is generally used to spray ammonia water, which is then mixed with the flue gas to generate nitrogen and water under the action of a catalyst at a certain temperature to achieve the purpose of denitrification. However, since the nozzles of the existing water spraying mechanism are all fixed, once the nozzles are locally blocked or unable to spray water due to other reasons, the flue gas in the area sprayed by the nozzle cannot come into contact with the nitrogen water, thereby affecting the subsequent treatment work. Therefore, a steam boiler denitrification system is proposed to address the above problems. Utility Model Content
[0005] The utility model aims to provide a steam boiler denitration system to solve the problems raised in the above background technology.
[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:
[0007] As an optional solution of the steam boiler denitration system described in the utility model, a steam boiler denitration system includes a box body and a water inlet pipe,
[0008] A water inlet pipe is fixedly connected to one side of the box body, and evenly distributed spraying components are fixedly connected below the water inlet pipe;
[0009] The spray assembly includes a connecting pipe, a dispersion frame and a hollow pipe. The top of the connecting pipe is connected to the water inlet pipe, the bottom of the connecting pipe is rotatably connected to the dispersion frame, the outside of the dispersion frame is connected to evenly distributed hollow pipes, and the other side of the hollow pipe is connected to the spray pipe, and the bottom of the spray pipe is provided with a spray hole.
[0010] As an optional solution of the steam boiler denitration system described in the utility model, the spray pipe is arranged at an angle, and the angle formed by the spray pipe and the hollow pipe is 150°.
[0011] When the existing denitration equipment is in use, a water spraying mechanism is generally used to spray ammonia water, which is then mixed with flue gas to generate nitrogen and water under a certain temperature and under the action of a catalyst to achieve the purpose of denitration. However, since the nozzles of the existing water spraying mechanism are all fixed, once a local nozzle is blocked or water cannot be sprayed due to other reasons, the flue gas in the area sprayed by the nozzle cannot contact with nitrogen water, thereby affecting subsequent treatment work. When the present device is in use, a connecting pipe and a rotatable dispersion frame are provided at the bottom of the water inlet pipe. Under the impact of nitrogen water, nitrogen water enters the dispersion frame through the connecting pipe. When the nitrogen water flows, the hollow pipe and the spray pipe are matched to ensure that the dispersion frame rotates. At this time, the spray pipe can be automatically rotated and nitrogen water can be sprayed through the spray hole, which is helpful for the nitrogen water to be fully mixed with the flue gas. Even if the local spray hole is blocked, the spray holes in other parts can also achieve a good spraying purpose. At the same time, the spray pipe is movable, which can make up for the situation that the blocked part cannot spray water, ensuring that the nitrogen water is fully in contact with the flue gas.
[0012] As an optional scheme of a steam boiler denitrification system described in the utility model, wherein: the interior of the connecting pipe is fixedly connected with a laterally arranged connecting rod, the bottom of the connecting rod is rotatably connected with a rotating shaft, the bottom of the rotating shaft is rotatably connected to a dispersion frame, the outer side of the rotating shaft is fixedly connected with paddles and a connecting shaft distributed up and down, and the other end of the connecting shaft is fixedly connected with a cleaning plate, the other end of the cleaning plate is fixedly connected with a cleaning brush, the other end of the cleaning brush contacts a filter cartridge, and the outer side of the filter cartridge is fixedly connected to the dispersion frame.
[0013] As an optional solution of the steam boiler denitration system described in the utility model, the upper and lower sides of the filter cartridge are open.
[0014] A rotating shaft, a paddle and a connecting shaft are arranged inside the connecting pipe. The paddle is impacted by nitrogen water, and the paddle drives the rotating shaft to rotate. The rotating shaft drives the connecting shaft, the cleaning plate and the cleaning brush to rotate. At this time, the cleaning brush rotates in the opposite direction to the filter cartridge, so as to ensure that the inner wall of the filter cartridge is cleaned and the upper part of the filter cartridge is not blocked, which is conducive to the flow of nitrogen water. The setting of the filter cartridge serves the purpose of filtering the nitrogen water and preventing impurities from clogging the spray hole.
[0015] As an optional solution of the steam boiler denitration system described in the utility model, a transversely arranged mesh plate is fixedly connected to the interior of the box body, and the mesh plate is located below the spraying assembly.
[0016] When nitrogen water is sprayed from the spray hole, the nitrogen water contacts the mesh plate, and some nitrogen water droplets adhere to the surface of the mesh plate. When the flue gas flows, it can further ensure contact with the nitrogen water, which is helpful for subsequent work.
[0017] Compared with the prior art, the beneficial effects of the utility model are:
[0018] When the utility model is in use, a connecting pipe and a rotatable dispersion frame are arranged at the bottom of the water inlet pipe. Under the impact of nitrogen water, the hollow pipe and the spraying pipe are matched to ensure that the dispersion frame rotates, and the nitrogen water can be automatically rotated to spray automatically, which is helpful for the nitrogen water to be fully mixed with the flue gas. Even if the local spraying hole is blocked, the spraying holes in other parts can also achieve a good spraying purpose. At the same time, the spraying pipe is movable, which can make up for the situation that the blocked part cannot spray water, and ensure that the nitrogen water is fully in contact with the flue gas.
[0019] A rotating shaft, a paddle and a connecting shaft are arranged inside the connecting pipe. The paddle is impacted by nitrogen water, and the paddle drives the rotating shaft to rotate. The rotating shaft drives the connecting shaft, the cleaning plate and the cleaning brush to rotate. At this time, the cleaning brush rotates in the opposite direction to the filter cartridge, so as to ensure that the inner wall of the filter cartridge is cleaned and the upper part of the filter cartridge is not blocked, which is conducive to the flow of nitrogen water. The setting of the filter cartridge serves the purpose of filtering the nitrogen water and preventing impurities from clogging the spray hole. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0021] Figure 2 This is a schematic diagram of the structure of the spray assembly of the utility model;
[0022] Figure 3 A bottom view of the spray assembly of the utility model;
[0023] Figure 4 It is a cross-sectional view of the dispersion frame of the utility model.
[0024] In the figure: 1. box body; 2. water inlet pipe; 3. spray assembly; 301. connecting pipe; 302. dispersion frame; 303. hollow pipe; 304. spray pipe; 305. spray hole; 306. connecting rod; 307. rotating shaft; 308. paddle; 309. connecting shaft; 310. cleaning plate; 311. cleaning brush; 312. filter cartridge; 4. mesh plate. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0026] Example 1
[0027] See also Figure 1 , Figure 2 and Figure 3 , the utility model provides a technical solution:
[0028] A steam boiler denitration system comprises a housing 1 and a water inlet pipe 2.
[0029] A water inlet pipe 2 is fixedly connected to one side of the box body 1, and evenly distributed spraying components 3 are fixedly connected below the water inlet pipe 2;
[0030] The spray assembly 3 includes a connecting pipe 301, a dispersion frame 302 and a hollow tube 303. The top of the connecting pipe 301 is connected to the water inlet pipe 2. The bottom of the connecting pipe 301 is rotatably connected to the dispersion frame 302. The outer side of the dispersion frame 302 is connected to uniformly distributed hollow tubes 303, and the other side of the hollow tube 303 is connected to a spray pipe 304. The bottom of the spray pipe 304 is provided with a spray hole 305.
[0031] The spray pipe 304 is arranged at an angle, and the angle formed by the spray pipe 304 and the hollow tube 303 is 150°.
[0032] When the existing denitration equipment is in use, a water spraying mechanism is generally used to spray ammonia water, which is then mixed with the flue gas to generate nitrogen and water under the action of a catalyst at a certain temperature to achieve the purpose of denitration. However, since the nozzles of the existing water spraying mechanism are all fixed, once a local nozzle is blocked or water cannot be sprayed due to other reasons, the flue gas in the area sprayed by the nozzle cannot contact the nitrogen water, thereby affecting the subsequent treatment work. When the present device is in use, a connecting pipe 301 and a rotatable dispersion frame 302 are provided at the bottom of the water inlet pipe 2. Under the impact of nitrogen water, the nitrogen water enters the dispersion frame 302 through the connecting pipe 301. When the nitrogen water flows, the hollow tube 304 is used to rotate the nitrogen water. 303 and the spraying pipe 304, at this time, the dispersion frame 302 can be ensured to rotate, and the spraying pipe 304 can be automatically rotated and spray nitrogen water through the spraying hole 305, which is helpful for the nitrogen water to be fully mixed with the flue gas. Even if the local spraying hole 305 is blocked, the spraying holes 305 in other parts can also achieve a good spraying purpose. At the same time, the spraying pipe 304 is movable, which can make up for the situation that the blocked part cannot spray water, ensuring that the nitrogen water is fully in contact with the flue gas. The spraying pipe 304 forms a certain angle with the hollow tube 303, which helps to ensure that the spraying pipe 304 and the hollow tube 303 rotate, thereby realizing rotary spraying, ensuring uniform spraying, and ensuring that the nitrogen water is fully in contact with the flue gas.
[0033] Example 2
[0034] This embodiment is an improvement on embodiment 1. Figure 4 Specifically, the interior of the connecting tube 301 is fixedly connected with a laterally arranged connecting rod 306, the bottom of the connecting rod 306 is rotatably connected with a rotating shaft 307, the bottom of the rotating shaft 307 is rotatably connected with the dispersion frame 302, the outer side of the rotating shaft 307 is fixedly connected with paddles 308 and a connecting shaft 309 distributed up and down, and the other end of the connecting shaft 309 is fixedly connected with a cleaning plate 310, the other end of the cleaning plate 310 is fixedly connected with a cleaning brush 311, the other end of the cleaning brush 311 contacts with a filter cartridge 312, and the outer side of the filter cartridge 312 is fixedly connected with the dispersion frame 302.
[0035] The filter cartridge 312 is open at both the upper and lower sides.
[0036] A rotating shaft 307, a paddle 308 and a connecting shaft 309 are arranged inside the connecting pipe 301. The paddle 308 is impacted by nitrogen water, and the paddle 308 drives the rotating shaft 307 to rotate. The rotating shaft 307 drives the connecting shaft 309, the cleaning plate 310 and the cleaning brush 311 to rotate. At this time, the cleaning brush 311 rotates in the opposite direction to the filter cartridge 312, which can ensure that the inner wall of the filter cartridge 312 is cleaned and the upper part of the filter cartridge 312 is not blocked, which is conducive to the flow of nitrogen water. The setting of the filter cartridge 312 serves the purpose of filtering nitrogen water and preventing impurities from clogging the spray hole 305.
[0037] Example 3
[0038] This embodiment is an improvement on embodiment 2. Figure 1 Specifically, a transversely arranged mesh plate 4 is fixedly connected to the interior of the box body 1 , and the mesh plate 4 is located below the spray assembly 3 .
[0039] When the nitrogen water is sprayed through the spray hole 305, the nitrogen water contacts the mesh plate 4, and some nitrogen water droplets adhere to the surface of the mesh plate 4. When the flue gas flows, it can further ensure contact with the nitrogen water, which is helpful for subsequent work.
[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.
[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A steam boiler denitration system, characterized in that: It comprises a box body (1) and a water inlet pipe (2), A water inlet pipe (2) is fixedly connected to one side of the box body (1), and evenly distributed spraying components (3) are fixedly connected below the water inlet pipe (2); The spray assembly (3) comprises a connecting pipe (301), a dispersion frame (302) and a hollow pipe (303); the top of the connecting pipe (301) is connected to the water inlet pipe (2); the bottom of the connecting pipe (301) is rotatably connected to the dispersion frame (302); the outer side of the dispersion frame (302) is connected to the evenly distributed hollow pipes (303); the other side of the hollow pipe (303) is connected to a spray pipe (304); and the bottom of the spray pipe (304) is provided with a spray hole (305).
2. A steam boiler denitration system according to claim 1, characterized in that: The spray pipe (304) is arranged at an angle, and the angle formed by the spray pipe (304) and the hollow tube (303) is 150°.
3. A steam boiler denitration system according to claim 1, characterized in that: The connecting tube (301) is fixedly connected inside with a transversely arranged connecting rod (306), the bottom of the connecting rod (306) is rotatably connected with a rotating shaft (307), the bottom of the rotating shaft (307) is rotatably connected with the dispersion frame (302), the outer side of the rotating shaft (307) is fixedly connected with blades (308) and a connecting shaft (309) distributed up and down, and the other end of the connecting shaft (309) is fixedly connected with a cleaning plate (310), the other end of the cleaning plate (310) is fixedly connected with a cleaning brush (311), the other end of the cleaning brush (311) contacts with a filter cartridge (312), and the outer side of the filter cartridge (312) is fixedly connected with the dispersion frame (302).
4. A steam boiler denitration system according to claim 3, characterized in that: The filter cartridge (312) is open at both the upper and lower sides.
5. A steam boiler denitration system according to claim 1, characterized in that: A transversely arranged mesh plate (4) is also fixedly connected to the interior of the box body (1), and the mesh plate (4) is located below the spraying assembly (3).