Ammonia supply adjusting device

Abstract

The utility model relates to the technical field of boiler denitration, in particular to an ammonia supply adjusting device which comprises a purification seat, a twitching groove is formed in the back of the side face of the purification seat, purification pipelines are fixedly connected to the upper end and the lower end of the purification seat, a gas uniformizing pipe is arranged in the center of the interior of each purification pipeline, and a gas conveying pipe is arranged in the center of the interior of each gas uniformizing pipe. And a first drawing frame is movably connected to the interior of the purification seat, and a second drawing frame is arranged at one end of the first drawing frame. Through the arrangement of the purification base, the drawing groove, the purification pipeline, the first drawing frame, the spraying grid and the adjusting shifting block, the device can improve the ammonia water atomization effect and the ammonia water utilization rate by optimizing the hole diameter of the spray head of the ammonia water spray gun, and the device is convenient to use in the actual use process. A worker can make the first drawing frame integrally connected into a drawing groove of the purification base in a butt joint mode, and then the electric push rods at the upper ends and the lower ends of the two sides of the purification base are started to conduct jacking adjustment operation on the adjusting shifting blocks on the two sides of the spraying grid.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler denitration, in particular to an ammonia supply regulating device. Background Art

[0002] At present, the main method of denitrification in boilers is to use SCR denitrification devices. The catalyst in the SCR denitrification device has certain requirements for the flue gas temperature. The flue gas temperature is an important factor affecting the operation of the catalyst. It not only determines the reaction rate of the reactants, but also determines the reaction activity and life of the catalyst. When the flue gas temperature is lower than the suitable temperature of the catalyst reaction, the catalyst will have side reactions. Therefore, it is very difficult to achieve full SCR denitrification.

[0003] When the boiler is running at full load, the flue gas temperature can generally reach the temperature required by the catalyst, but when the boiler is started or running at low load, the heat generated by combustion is reduced and the flue gas temperature often does not meet the standard. In particular, in order to absorb more renewable energy, it is now highly recommended that the boiler has peak-shaving capability and can operate at low load when needed. When encountering these times, the original design cannot reach the flue gas temperature and it will be difficult to eliminate the nitrogen oxides therein. The existing commonly used method in the flue is to change the distribution of the economizer or add an economizer bypass, reduce the economizer at the front end of the SCR denitrification device, thereby reducing the flue gas temperature consumed by the economizer's heat absorption. This method sacrifices the efficiency of the economizer, that is, the power generation efficiency, and cannot meet daily use needs. Therefore, it is urgent to design an ammonia supply adjustment device to solve the above problems. Summary of the invention

[0004] The purpose of the utility model is to provide an ammonia supply regulating device to solve the problem that the existing commonly used method in the flue proposed in the above background technology is to change the distribution of the economizer or add an economizer bypass, reduce the economizer at the front end of the SCR denitrification device, thereby reducing the flue gas temperature consumed by the economizer's heat absorption. This method sacrifices the efficiency of the economizer, that is, the power generation efficiency, and cannot meet the daily usage needs.

[0005] To achieve the above object, the utility model provides the following technical solutions: an ammonia supply regulating device, comprising a purification seat, a pumping groove is provided on the side and back of the purification seat, a purification pipeline is fixedly connected to the upper and lower ends of the purification seat, an air distribution pipe is provided at the inner center of the purification pipeline, and an air delivery pipe is provided at the inner center of the air distribution pipe;

[0006] A first draw-out frame, the purification seat is movably connected to the first draw-out frame inside, a second draw-out frame is arranged at one end of the first draw-out frame, and the first draw-out frame and the second draw-out frame have the same structure.

[0007] Preferably, a double-headed valve is provided between the first pumping frame and the second pumping frame, and a feed pipe is fixedly connected to the back of the double-headed valve.

[0008] Preferably, the first and second pumping frames are provided with spray grids inside, and both ends of the spray grids are provided with adjustment blocks.

[0009] Preferably, a movable pull seat is fixedly connected to one end of the first pulling frame and the second pulling frame which are away from each other, and electric push rods are arranged at the upper and lower ends of both sides of the purification seat.

[0010] Preferably, a limiting rubber strip is provided on the inner wall of the pulling groove, and the limiting rubber strip is adapted to fit between the first pulling frame and the second pulling frame.

[0011] Preferably, an air-uniform hole groove is provided at the inner center of the air-uniform pipe, and an exhaust grille is provided at the inner center of the air delivery pipe.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The ammonia supply regulating device can optimize the nozzle aperture of the ammonia spray gun, improve the ammonia atomization effect, and improve the utilization rate of ammonia by optimizing the nozzle aperture of the ammonia spray gun. In actual use, the staff can dock the first pumping frame as a whole to the inside of the pumping slot of the purification seat, and then start the electric push rods at the upper and lower ends of the purification seat to perform the lifting and regulating operation on the regulating blocks on both sides of the spray grid, so that the spray grid inside the first pumping frame can perform ammonia atomization spraying operation reciprocating up and down. By reasonably designing the diameters of the branch pipes at the ammonia spraying main pipe and the ammonia spraying grid, the flow rate of the ammonia spraying branch pipe and the ammonia spraying amount of each nozzle on the same ammonia spraying branch pipe can be uniform, so that the ammonia concentration in each area of ​​the flue is evenly distributed. Combined with the optimization of the flue flow field, NH3 / NOx in each area can be evenly distributed, so as to ensure the denitrification efficiency required by the design and reduce the ammonia escape amount, alleviate the blockage problem of the air preheater, and reflect the practicality of the equipment design.

[0014] The ammonia supply regulating device further improves the overall use effect of the equipment by arranging the purification seat, the pumping groove, the uniform air pipe, the gas supply pipe, the first pumping frame, the second pumping frame, the double-headed valve, the feeding pipe, the movable pull seat, the limiting rubber strip, the uniform air hole groove and the exhaust grille. In the daily use process, the staff can quickly switch the first pumping frame and the second pumping frame back and forth at the pumping groove of the purification seat through their respective movable pull seats, and perform a stable limiting operation through the limiting rubber strip on the inner wall of the pumping groove. After that, the ammonia water is switched to the first pumping frame or the second pumping frame through the double-headed valve and the feeding pipe, so as to quickly complete the switching and use operation of the ammonia spraying equipment inside the purification seat, thereby realizing efficient maintenance operation. At the same time, the exhaust gas can be transported from the gas supply pipe, and discharged layer by layer through the exhaust grille, and evenly sprayed through the uniform air hole groove in the center of the uniform air pipe, so as to have a more sufficient contact operation with the ammonia water, which reflects the comprehensiveness of the equipment design. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;

[0016] Figure 2 It is an overall schematic diagram of the first twitching frame and the second twitching frame structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the structure of the gas distribution pipe and the gas delivery pipe of the utility model;

[0018] Figure 4 For this utility model Figure 1 A magnified schematic diagram of the structure in the middle.

[0019] In the figure: 1. Purification seat; 2. Pumping slot; 3. Purification pipeline; 4. Air uniformity pipe; 5. Air supply pipe; 6. First pumping frame; 7. Second pumping frame; 8. Double-head valve; 9. Feed pipe; 10. Spray grille; 11. Adjustment dial block; 12. Movable pull seat; 13. Electric push rod; 14. Limiting rubber strip; 15. Air uniformity hole slot; 16. Exhaust grille. DETAILED DESCRIPTION

[0020] 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.

[0021] See also Figure 1-4 , an embodiment provided by the utility model:

[0022] An ammonia supply regulating device comprises a purification seat 1, a pumping groove 2 is provided on the side and back of the purification seat 1, a purification pipe 3 is fixedly connected to the upper and lower ends of the purification seat 1, an air uniforming pipe 4 is provided at the inner center of the purification pipe 3, an air supply pipe 5 is provided at the inner center of the air uniforming pipe 4, a limiting rubber strip 14 is provided on the inner wall of the pumping groove 2, the limiting rubber strip 14 is adapted between a first pumping frame 6 and a second pumping frame 7, an air uniforming hole groove 15 is provided at the inner center of the air uniforming pipe 4, an exhaust grille 16 is provided at the inner center of the air supply pipe 5, the first pumping frame 6 is integrally connected to the pumping groove 2 of the purification seat 1, and then the electric push rods 13 at the upper and lower ends of both sides of the purification seat 1 are started to perform the lifting and regulating operation of the regulating blocks 11 on both sides of the spray grille 10, so that the spray grille 10 inside the first pumping frame 6 performs an up and down reciprocating ammonia atomization spraying operation, and the diameters of the ammonia spraying main pipe and the branch pipes at the ammonia spraying grille are reasonably designed.

[0023] The first pumping frame 6 and the purification seat 1 are movably connected to the first pumping frame 6 inside, and a second pumping frame 7 is arranged at one end of the first pumping frame 6. The first pumping frame 6 and the second pumping frame 7 have the same structure. A double-headed valve 8 is arranged between the first pumping frame 6 and the second pumping frame 7. A feeding pipe 9 is fixedly connected to the back of the double-headed valve 8. Spray grids 10 are arranged inside the first pumping frame 6 and the second pumping frame 7. Adjustment blocks 11 are arranged at both ends of the spray grid 10. The first pumping frame 6 and the second pumping frame 7 are fixedly connected to a movable pull seat 12 at one end away from each other. Electric push rods 13 are arranged at the upper and lower ends of both sides of the purification seat 1. The first pumping frame 6 and the second pumping frame 7 are quickly switched back and forth at the pumping groove 2 of the purification seat 1 through their respective movable pull seats 12. The limiting rubber strip 14 on the inner wall of the pumping groove 2 is used for stable limiting operation. Then, the ammonia water is switched to the first pumping frame 6 or the second pumping frame 7 through the double-headed valve 8 and the feeding pipe 9.

[0024] Working principle: When in use, the user first docks the first pulling frame 6 as a whole to the inside of the pulling slot 2 of the purification seat 1, and then starts the electric push rods 13 at the upper and lower ends of the purification seat 1 to perform the lifting and adjusting operation on the adjustment blocks 11 on both sides of the spray grille 10, so that the spray grille 10 inside the first pulling frame 6 can perform ammonia atomization spraying operation reciprocating up and down. By reasonably designing the diameters of the branch pipes at the ammonia spraying main pipe and the ammonia spraying grid, the flow rate of the ammonia spraying branch pipe and the ammonia spraying amount of each nozzle on the same ammonia spraying branch pipe can be evenly distributed, so that the ammonia concentration in each area of ​​the flue is evenly distributed. Combined with the optimization of the flue flow field, NH3 / NOx in each area can be evenly distributed to ensure the denitrification efficiency required by the design and reduce the amount of ammonia escape, alleviate the blockage problem of the air preheater, and in daily use. During use, the staff can quickly switch the first drawing frame 6 and the second drawing frame 7 back and forth at the drawing slot 2 of the purification seat 1 through their respective movable pulling seats 12, and perform stable limiting operations through the limiting rubber strip 14 on the inner wall of the drawing slot 2. Then, the ammonia water is switched to the first drawing frame 6 or the second drawing frame 7 through the double-headed valve 8 and the feed pipe 9, so as to quickly complete the switching and use operation of the ammonia spraying equipment inside the purification seat 1, thereby realizing efficient maintenance operations. At the same time, the exhaust gas can be transported from the gas supply pipe 5, and discharged layer by layer through the exhaust grille 16, and evenly sprayed through the uniform air hole slot 15 in the center of the uniform air pipe 4, so as to have a more sufficient contact operation with the ammonia water. The above is the entire working principle of the utility model.

[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An ammonia supply regulating device, comprising a purification seat (1), characterized in that: The back of the side of the purification seat (1) is provided with a pumping groove (2); the upper and lower ends of the purification seat (1) are fixedly connected with a purification pipe (3); the inner center of the purification pipe (3) is provided with an air distribution pipe (4); and the inner center of the air distribution pipe (4) is provided with an air delivery pipe (5); A first draw-out frame (6), the interior of the purification seat (1) is movably connected with the first draw-out frame (6), one end of the first draw-out frame (6) is provided with a second draw-out frame (7), and the first draw-out frame (6) and the second draw-out frame (7) have the same structure.

2. An ammonia supply regulating device according to claim 1, characterized in that: A double-headed valve (8) is provided between the first pumping frame (6) and the second pumping frame (7), and a feed pipe (9) is fixedly connected to the back of the double-headed valve (8).

3. The ammonia supply regulating device according to claim 1, characterized in that: A spray grid (10) is arranged inside the first pumping frame (6) and the second pumping frame (7), and adjustment blocks (11) are arranged at both ends of the spray grid (10).

4. The ammonia supply regulating device according to claim 1, characterized in that: A movable pull seat (12) is fixedly connected to one end of the first draw frame (6) and the second draw frame (7) that are away from each other, and electric push rods (13) are provided at the upper and lower ends of both sides of the purification seat (1).

5. The ammonia supply regulating device according to claim 1, characterized in that: The inner wall of the pulling groove (2) is provided with a limiting rubber strip (14), and the limiting rubber strip (14) is adapted to fit between the first pulling frame (6) and the second pulling frame (7).

6. The ammonia supply regulating device according to claim 1, characterized in that: An air-uniform hole groove (15) is provided at the inner center of the air-uniform pipe (4), and an air-exhaust grille (16) is provided at the inner center of the air delivery pipe (5).

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