An ammonia injection device of a denitration system

Abstract

The utility model relates to a kind of ammonia injection device of denitration system, including spray tube, piston head, driving part, feed port piece and spray head, spray tube is sequentially provided with discharge cavity, mixing cavity and drive cavity from one end to the other end;Piston head is slidably connected in mixing cavity;Driving part is connected in drive cavity, and the driving end of driving part is connected with piston head;Feed port piece is connected on spray tube, and feed port piece is communicated with mixing cavity;Spray head is connected on spray tube, and spray head is communicated with discharge cavity.The beneficial effects of the application are that: after feed port piece introduces ammonia gas and other materials into mixing cavity, piston head reciprocally slides in mixing cavity under the driving of driving part, can fully stir and mix the material in mixing cavity, so that ammonia gas and other auxiliary gas or additive are evenly fused;The cooperation of driving part and piston head can flexibly control the ammonia gas flow and pressure ejected through spray head according to actual denitration demand.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas purification and denitrification technology, specifically relating to an ammonia injection device for a denitrification system. Background Technology

[0002] In the field of industrial flue gas denitrification, Selective Catalytic Reduction (SCR) technology has become a core technology for controlling nitrogen oxide emissions in industries such as thermal power, steel, and coking due to its advantages such as high denitrification efficiency and strong reaction stability. The core principle of this technology is that, under the action of a catalyst, ammonia gas acts as a reducing agent to react with nitrogen oxides in the flue gas, producing harmless nitrogen and water, thereby reducing pollutant emissions. As a key component of SCR technology, the performance of the precision ammonia injection system directly determines the denitrification efficiency, ammonia slip rate, and the operational safety of subsequent equipment. Against this backdrop, the precision ammonia injection nozzle, as the terminal actuator of the ammonia injection system, has its atomization effect, injection accuracy, and adaptability to operating conditions becoming the core bottleneck restricting the overall operational efficiency of the SCR system.

[0003] Currently, mainstream pressure nozzles rely on high pressure to spray ammonia water or ammonia gas to form droplets. The atomized particle size is directly affected by the inlet pressure. When the boiler load fluctuates and the flue gas volume changes, the nozzle inlet pressure will fluctuate accordingly, resulting in a significant deviation in the atomized particle size. Under high load conditions, the flue gas volume increases. If the nozzle pressure is insufficient, the atomized particle size will increase from the designed 50-100μm to more than 150μm. Large-diameter droplets are easily deposited on the flue wall due to gravity. After forming a liquid film, they cannot participate in the reaction and will also cause flue corrosion. Under low load conditions, if the pressure is too high and the atomized particle size is too small, it will be easily carried away by the flue gas, resulting in a sudden drop in ammonia concentration in local areas and forming a denitrification "blind zone". Although airflow nozzles reduce their dependence on pressure by using compressed air to assist atomization, they have the problem of difficulty in accurately controlling the mixing ratio of compressed air and ammonia. When the dust content in the flue gas is high, dust can easily enter the gas-liquid mixing chamber of the nozzle, causing blockage of the mixing channel and resulting in a sudden deterioration of the atomization effect. Some nozzles even exhibit a "jet" phenomenon, with ammonia being ejected in a columnar airflow that mixes almost no effectively with the flue gas, directly causing the local ammonia escape rate to soar far beyond the industry standard limit of 3 ppm.

[0004] Therefore, it is very necessary to provide an ammonia injection device for a denitrification system to solve the above-mentioned technical problems. Utility Model Content

[0005] Based on the above description, this utility model provides an ammonia injection device for a denitrification system to solve the problem that the existing pressure nozzles are prone to poor denitrification effect due to air pressure and the mixing ratio of compressed air and ammonia in the airflow nozzles.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: An ammonia injection device for a denitrification system includes a spray cylinder, a piston head, a driving component, a feed port component, and a nozzle. The spray cylinder is provided with a discharge chamber, a mixing chamber, and a driving chamber in sequence from one end to the other. The piston head is slidably connected in the mixing chamber. The driving component is connected in the driving chamber, and the driving end of the driving component is connected to the piston head. The feed port component includes a first ammonia water feed end and a first gas feed end connected to one side of the mixing chamber, and a second gas feed end and a second ammonia water feed end connected to the other side of the mixing chamber. The piston head is used to mix the high-pressure ammonia water and high-pressure gas input from the first ammonia water feed end, the first gas feed end, the second gas feed end, and the second ammonia water feed end. The nozzle is connected to the spray cylinder, and the nozzle communicates with the discharge chamber.

[0007] Preferably, after the feed port introduces materials such as ammonia into the mixing chamber, the piston head slides back and forth in the mixing chamber under the drive of the drive component, which can fully stir and mix the materials in the mixing chamber, so that ammonia is uniformly integrated with other auxiliary gases or additives, avoiding the problem of uneven local concentration that may occur in traditional ammonia injection structures.

[0008] In addition, the drive component is connected within the drive chamber and to the piston head via the drive end. By controlling the operating parameters of the drive component, such as rotational speed and stroke, the movement speed and displacement of the piston head within the mixing chamber can be adjusted. This allows for flexible control of the ammonia flow rate and pressure injected through the nozzle according to actual denitrification requirements. Under high-load denitrification conditions, the ammonia injection volume can be increased; under low-load conditions, ammonia usage can be reduced to save costs, effectively improving the adaptability and operating efficiency of the denitrification system.

[0009] Furthermore, the first ammonia inlet is connected to the spray cylinder; the first gas inlet is connected to the spray cylinder, and the first gas inlet and the first ammonia inlet are arranged parallel to each other along the axial direction of the spray cylinder; the second gas inlet is connected to the spray cylinder, and the second gas inlet and the first ammonia inlet are arranged symmetrically along the radial direction of the spray cylinder; the second ammonia inlet is connected to the spray cylinder, and the second ammonia inlet and the first gas inlet are arranged symmetrically along the radial direction of the spray cylinder; it also includes an ammonia tank and a gas storage tank, the ammonia tank is connected to a first ammonia pipe and a second ammonia pipe, the first ammonia pipe is connected to the first ammonia inlet, and the second ammonia pipe is connected to the second ammonia inlet; the gas storage tank is connected to a first gas pipe and a second gas pipe, the first gas pipe is connected to the first gas inlet, and the second gas pipe is connected to the second gas inlet.

[0010] Preferably, the feed port is equipped with a first ammonia water feed end, a first gas feed end, a second gas feed end, and a second ammonia water feed end, which can better control the entry of ammonia water and gas into the mixing chamber. The ammonia water tank is connected to the first ammonia water feed end and the second ammonia water feed end through a first ammonia water pipe and a second ammonia water pipe, respectively. The gas storage tank is connected to the first gas feed end and the second gas feed end through a first gas pipe and a second gas pipe, respectively, which can more rationally control the supply of ammonia water and gas according to the actual denitrification requirements.

[0011] Furthermore, pressure regulators are connected to the ends of the first and second ammonia pipes near the ammonia tank.

[0012] Preferably, the function of the one-way valve is to allow the material to flow in one direction and prevent it from flowing back. In the ammonia injection device of the denitrification system, when the piston head slides in the mixing chamber and pushes the material towards the discharge chamber, the one-way valve can effectively prevent the ammonia water and gas in the mixing chamber from flowing back to the ammonia water tank or gas storage tank through the feed end.

[0013] Furthermore, a one-way valve is connected to the first ammonia water inlet, the first gas inlet, the second gas inlet, and the second ammonia water inlet.

[0014] Preferably, the denitrification system faces various operating conditions during actual operation, such as changes in flue gas flow rate and nitrogen oxide content. The required ammonia supply pressure also varies under different conditions. The pressure regulator can adjust the pressure in the first and second ammonia pipes according to the actual operating conditions. For example, when the nitrogen oxide content in the flue gas is high and an increased ammonia supply is needed, the pressure regulator can correspondingly increase the pressure in the ammonia pipe, allowing the ammonia to enter the mixing chamber at a faster speed and greater flow rate, ensuring the complete denitrification reaction. Conversely, when the nitrogen oxide content is low, the pressure is reduced to decrease the ammonia supply and avoid ammonia waste.

[0015] Furthermore, a piston through hole is provided on the piston head. The piston head is configured such that: when the piston head moves to one end of the mixing chamber, the piston head blocks the first ammonia water inlet and the first gas inlet, so that the second gas inlet and the second ammonia water inlet are connected to the mixing chamber; when the piston head moves to the other end of the mixing chamber, the piston head blocks the second gas inlet and the second ammonia water inlet, so that the first ammonia water inlet and the first gas inlet are connected to the mixing chamber.

[0016] Preferably, the piston head reciprocates within the mixing chamber, and this alternating feeding method generates a strong stirring and mixing effect. When one batch of ammonia and gas enters the mixing chamber, the movement of the piston head disrupts the original distribution of the materials, allowing them to fully diffuse and mix within the chamber. Subsequently, the entry of another batch of ammonia and gas further promotes the mixing process. This repeated alternation and stirring ensures that the ammonia and gas achieve a highly uniform mixture, providing favorable conditions for the denitrification reaction and contributing to improved denitrification efficiency.

[0017] Furthermore, a limiting block is connected inside the mixing chamber, and the driving component includes a push block slidably connected to the mixing chamber. The push block has a sliding groove, and the sliding groove is slidably connected to the limiting block.

[0018] Preferably, the limiting block in the mixing chamber can limit the range of motion of the piston head and improve the stability of the pusher movement.

[0019] Furthermore, a sealing gasket is connected to one end of the push block near the piston head.

[0020] Preferably, if there are gaps at the connection between the push block and the piston head, ammonia and gas may leak out from these gaps. The sealing gasket can fit tightly against the contact surfaces of the push block and the piston head, filling any possible tiny gaps and forming a reliable sealing barrier to prevent the leakage of ammonia and gas.

[0021] Furthermore, the driving component includes a driving motor connected to the driving cavity and a main rotating block connected to the driving end of the driving motor. A rotating rod is rotatably connected to the main rotating block, and the other end of the rotating rod is rotatably connected to the push block. An auxiliary rotating block is rotatably connected to the other end of the rotating rod, and the auxiliary rotating block is rotatably connected inside the driving cavity.

[0022] Preferably, the drive motor drives the main rotating block to rotate, and the rotating rod on the main rotating block performs circular motion accordingly. Since the auxiliary rotating block is rotatably connected within the drive cavity, it provides support to the other end of the rotating rod, enabling the rotating rod to smoothly push the push block in reciprocating motion during the movement.

[0023] Furthermore, the discharge chamber is connected to support blocks at both ends, and mixing blades are rotatably connected to the support blocks. Discharge holes are opened on both support blocks.

[0024] Preferably, support blocks are provided at both ends of the discharge chamber and rotatably connected to mixing blades. When ammonia and gas flow in the discharge chamber, the mixing blades will rotate accordingly, so that the two materials can fully contact and mix.

[0025] Furthermore, the nozzle outlet end is connected to a dust-blocking grid.

[0026] Preferably, the dust-blocking grille can effectively intercept dust and particulate matter in the flue gas, preventing them from entering the nozzle.

[0027] Compared with the prior art, the technical solution of this application has the following beneficial technical effects:

[0028] 1. After the feed port component introduces materials such as ammonia into the mixing chamber, the piston head slides back and forth in the mixing chamber under the drive of the drive component, which can fully stir and mix the materials in the mixing chamber, so that ammonia can be evenly integrated with other auxiliary gases or additives.

[0029] 2. The cooperation between the drive unit and the piston head allows for flexible control of the ammonia flow rate and pressure injected through the nozzle according to actual denitrification requirements. Under high-load denitrification conditions, the ammonia injection volume can be increased, while under low-load conditions, ammonia usage can be reduced to save costs, effectively improving the adaptability and operating efficiency of the denitrification system;

[0030] 3. The entire ammonia injection structure integrates the discharge chamber, mixing chamber, and drive chamber into one unit. The connections between the components are tight and reasonable, which improves the long-term stability of the overall structure. Attached Figure Description

[0031] Figure 1 A partial structural diagram of an ammonia injection device for a denitrification system provided in this embodiment of the utility model. Figure 1 ;

[0032] Figure 2 for Figure 1 Enlarged structural diagram at point Q;

[0033] Figure 3 for Figure 1 Enlarged structural diagram at point W; Overall structural diagram of an ammonia injection device for a denitrification system provided in this embodiment of the present invention. Figure 1 ;

[0034] Figure 4 A partial structural diagram of an ammonia injection device for a denitrification system provided in this embodiment of the utility model. Figure 2 ;

[0035] Figure 5 A schematic diagram of the overall structure of an ammonia injection device for a denitrification system provided in this embodiment of the utility model. Figure 1 ;

[0036] Figure 6 A schematic diagram of the overall structure of an ammonia injection device for a denitrification system provided in this embodiment of the utility model. Figure 2 .

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Spray nozzle;

[0039] 11. Discharge chamber; 111. Support block; 112. Mixing blades; 113. Discharge hole;

[0040] 12. Mixing chamber; 121. Limiting block;

[0041] 13. Driving cavity;

[0042] 2. Piston head; 21. Piston through hole;

[0043] 3. Driving components;

[0044] 31. Push block; 311. Slide groove;

[0045] 32. Drive motor; 33. Main rotating block; 34. Rotating rod; 35. Auxiliary rotating block;

[0046] 4. Feed port components; 41. First ammonia water feed end; 42. First gas feed end; 43. Second gas feed end; 44. Second ammonia water feed end;

[0047] 45. Ammonia tank; 451. First ammonia pipe; 452. Second ammonia pipe;

[0048] 46. ​​Gas storage tank; 461. First gas pipe; 462. Second gas pipe;

[0049] 47. Check valve;

[0050] 48. Pressure regulator;

[0051] 5. Spray nozzle; 51. Dust-blocking grille;

[0052] 6. Sealing gasket. Detailed Implementation

[0053] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0054] See Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, an ammonia injection device for a denitrification system includes a spray cylinder 1, a piston head 2, a drive component 3, a feed port component 4, and a nozzle 5. The spray cylinder 1 is provided with a discharge chamber 11, a mixing chamber 12, and a drive chamber 13 sequentially from one end to the other. The piston head 2 is slidably connected in the mixing chamber 12. The drive component 3 is connected in the drive chamber 13, and the drive end of the drive component 3 is connected to the piston head 2. The feed port component 4 includes a first ammonia water feed end 41 and a first gas feed end 42 connected to one side of the mixing chamber 12, and a second gas feed end 43 and a second ammonia water feed end 44 connected to the other side of the mixing chamber 12. The piston head 2 is used to mix the high-pressure ammonia water and high-pressure gas input from the first ammonia water feed end 41, the first gas feed end 42, the second gas feed end 43, and the second ammonia water feed end 44. The nozzle 5 is connected to the spray cylinder 1 and communicates with the discharge chamber 11.

[0055] In this embodiment, the spray nozzle 1 is a hollow tubular structure with three functionally different cavities arranged sequentially along the axial direction: a discharge cavity 11 near the nozzle 5, a mixing cavity 12 in the middle, and a drive cavity 13 away from the nozzle 5. The three cavities are interconnected, forming a channel for material and power transmission. The piston head 2 is a cylindrical shape adapted to the spray nozzle 1, with its outer wall tightly fitted to the inner wall of the mixing cavity 12, and can slide along the axial direction of the mixing cavity 12. The center of the piston head 2 has several through piston holes 21, which are used to assist material flow and pressure balance during sliding. The drive component 3 is installed in the drive cavity 13 and is the power source for the piston head 2. It can drive the piston head 2 to move, so that the piston head 2 pushes the denitrification material (such as ammonia water or urea solution) out of the nozzle 5 to carry out denitrification.

[0056] See Figure 5 and Figure 6As shown, in some embodiments, the first ammonia inlet 41 is connected to the spray cylinder 1; the first gas inlet 42 is connected to the spray cylinder 1, and the first gas inlet 42 and the first ammonia inlet 41 are arranged parallel to each other along the axial direction of the spray cylinder 1; the second gas inlet 43 is connected to the spray cylinder 1, and the second gas inlet 43 and the first ammonia inlet 41 are arranged symmetrically along the radial direction of the spray cylinder 1; the second ammonia inlet 44 is connected to the spray cylinder 1, and the second ammonia inlet 44 and the first gas inlet 41 are arranged symmetrically along the radial direction of the spray cylinder 1. The material end 42 is symmetrically arranged radially along the spray cylinder 1; it also includes an ammonia tank 45 and a gas storage tank 46. The ammonia tank 45 is connected to a first ammonia pipe 451 and a second ammonia pipe 452. The first ammonia pipe 451 is connected to the first ammonia inlet end 41, and the second ammonia pipe 452 is connected to the second ammonia inlet end 44. The gas storage tank 46 is connected to a first gas pipe 461 and a second gas pipe 462. The first gas pipe 461 is connected to the first gas inlet end 42, and the second gas pipe 462 is connected to the second gas inlet end 43.

[0057] In this embodiment, the feed port component 4 includes a first ammonia feed end 41, a second ammonia feed end 44 and an ammonia tank 45 for conveying ammonia water, and a first gas feed end 42, a second gas feed end 43 and a gas storage tank 46 for conveying gas.

[0058] The first ammonia water inlet 41 is connected to the outer wall of the mixing chamber 12 of the spray cylinder 1, and is an inlet for ammonia water to enter the mixing chamber 12; the first gas inlet 42 is connected to the outer wall of the mixing chamber 12 of the spray cylinder 1, and its installation position is parallel to the first ammonia water inlet 41 along the axial direction of the spray cylinder 1, that is, the two are on the same side of the outer wall of the mixing chamber 12, and are arranged side by side, for conveying gas into the mixing chamber 12.

[0059] Furthermore, the second gas inlet 43 is connected to the outer wall of the mixing chamber 12 of the spray nozzle 1, and its installation position is symmetrical to that of the first ammonia inlet 41. That is, if the first ammonia inlet 41 is on the upper wall of the mixing chamber 12, the second gas inlet 43 is on the lower wall of the mixing chamber 12, and the two are on the same radial line, serving as another inlet for gas to enter the mixing chamber 12; the second ammonia inlet 44 is a tubular structure, connected to the outer wall of the mixing chamber 12 of the spray nozzle 1, and its installation position is symmetrical to that of the first gas inlet 42. That is, the first gas inlet 42 is on the upper wall of the mixing chamber 12, the second ammonia inlet 44 is on the lower wall of the mixing chamber 12, and the two are on the same radial line, serving as another inlet for ammonia to enter the mixing chamber 12.

[0060] In addition, the ammonia tank 45 is a closed container used to store ammonia to be transported. Its output end is connected to two conveying pipes, a first ammonia pipe 451 and a second ammonia pipe 452. The other end of the first ammonia pipe 451 is sealed to the first ammonia inlet 41, so that the ammonia in the ammonia tank 45 can be transported to the first ammonia inlet 41 through the first ammonia pipe 451 and then enter the mixing chamber 12. The other end of the second ammonia pipe 452 is sealed to the second ammonia inlet 44, so that the ammonia in the ammonia tank 45 can be transported to the second ammonia inlet 44 through the second ammonia pipe 452 and then enter the mixing chamber 12.

[0061] Furthermore, the gas storage tank 46 is a closed pressure vessel used to store compressed gas to be transported, such as compressed air or other reactive gases. Its output end is connected to two conveying pipelines, a first gas pipe 461 and a second gas pipe 462. The other end of the first gas pipe 461 is sealed to the first gas inlet end 42, so that the gas in the gas storage tank 46 can be transported through the first gas pipe 461 to the first gas inlet end 42 and then enter the mixing chamber 12. The other end of the second gas pipe 462 is sealed to the second gas inlet end 43, so that the gas in the gas storage tank 46 can be transported through the second gas pipe 462 to the second gas inlet end 43 and then enter the mixing chamber 12.

[0062] See Figure 5 and Figure 6 As shown, in some embodiments, the first ammonia pipe 451 and the second ammonia pipe 452 are connected to a pressure regulator 48 at one end near the ammonia tank 45.

[0063] In this embodiment, the pressure regulator 48 is fixed in the vicinity of the connection between the first ammonia water pipe 451, the second ammonia water pipe 452 and the outlet of the ammonia water tank 45, and can preferentially regulate the pressure of the ammonia water flowing out of the ammonia water tank 45.

[0064] In addition, the ammonia pressure in the ammonia tank 45 may be unstable due to changes in liquid level and fluctuations in ambient temperature. The pressure regulator 48 can monitor the ammonia pressure in the pipeline in real time and adjust the flow cross-sectional area by opening and closing the internal valve core to stabilize the ammonia pressure within a preset range (such as 0.2-0.5MPa, specifically set according to denitrification requirements), avoiding pipeline leakage due to excessive pressure or insufficient ammonia delivery due to excessive pressure. At the same time, each ammonia tank 45 and gas storage tank 46 can be connected to multiple spray cylinders 1, piston heads 2, drive components 3, feed port components 4, and nozzles 5 to carry out large-scale ammonia spray denitrification work. This can be achieved by setting multiple ammonia pipes and gas pipes between the ammonia tank 45 and the gas storage tank 46 and connecting them to the mixing chamber 12 of the corresponding spray cylinder 1. The connection method is similar to that described above and will not be elaborated here.

[0065] See Figure 5 and Figure 6 As shown, in some embodiments, a one-way valve 47 is connected to the first ammonia water inlet 41, the first gas inlet 42, the second gas inlet 43, and the second ammonia water inlet 44.

[0066] In this embodiment, the one-way valve 47 is used to prevent backflow of material in the mixing chamber 12.

[0067] See Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, in some embodiments, the piston head 2 has a piston through hole 21. The piston head 2 is configured such that: when the piston head 2 moves to one end of the mixing chamber 12, the piston head 2 blocks the first ammonia water inlet 41 and the first gas inlet 42, so that the second gas inlet 43 and the second ammonia water inlet 44 are connected to the mixing chamber 12; when the piston head 2 moves to the other end of the mixing chamber 12, the piston head 2 blocks the second gas inlet 43 and the second ammonia water inlet 44, so that the first ammonia water inlet 41 and the first gas inlet 42 are connected to the mixing chamber 12.

[0068] In this embodiment, the piston through-hole 21 is a through-hole circular hole opened in the center of the piston head 2. The diameter of the hole is smaller than the diameter of the piston head 2 and is aligned with the axis of the mixing chamber 12. When the piston head 2 slides in the mixing chamber 12, the piston through-hole 21 can connect the cavity spaces on both sides, avoiding sudden increases or decreases in local pressure caused by the movement of the piston head 2, ensuring a smooth sliding process, and at the same time assisting in the slight flow of materials in the mixing chamber 12, improving the mixing uniformity.

[0069] When piston head 2 moves to the end of mixing chamber 12 near discharge chamber 11, the left end face of piston head 2 is in contact with the left inner wall of mixing chamber 12, and its outer wall just covers the openings of the first ammonia water inlet end 41 and the first gas inlet end 42 in the inner wall of mixing chamber 12, completely blocking the two inlet ports and cutting off the channels for ammonia water and gas to enter mixing chamber 12 from the set of ports.

[0070] Meanwhile, the right side of the piston head 2 is far away from the openings of the second gas feed end 43 and the second ammonia feed end 44, so that these two ports are completely connected to the inside of the mixing chamber 12. Ammonia can enter the second ammonia feed end 44 through the second ammonia pipe 452, and gas can enter the second gas feed end 43 through the second gas pipe 462 and then enter the mixing chamber 12.

[0071] In addition, the piston head 2 moves to the end of the mixing chamber 12 near the drive chamber 13. At this time, the right end face of the piston head 2 is attached to the right inner wall of the mixing chamber 12, and its outer wall covers the openings of the second gas feed end 43 and the second ammonia feed end 44 in the inner wall of the mixing chamber 12, completely blocking the two feed ports and stopping the material input of this set of ports.

[0072] See Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, in some embodiments, a limiting block 121 is connected inside the mixing chamber 12, and the driving member 3 includes a push block 31 slidably connected to the mixing chamber 12. The push block 31 has a sliding groove 311, which is slidably connected to the limiting block 121.

[0073] In this embodiment, the pusher block 31 is a cylindrical or square block structure, with its outer wall fitting against the inner walls of the mixing chamber 12 and the driving chamber 13. The sliding groove 311 and the pusher block 31 cooperate with a fixed guide component in the driving chamber 13 to restrict the movement direction of the pusher block 31. In addition, the limiting block 121 is arranged along the axial direction of the driving chamber 13, and the sliding groove 311 is sleeved on the limiting block 121 to realize the directional sliding of the pusher block 31.

[0074] See Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, in some embodiments, a sealing gasket 6 is connected to one end of the pusher block 31 near the piston head 2.

[0075] In this embodiment, the sealing gasket 6 is made of corrosion-resistant rubber and is used to fill the gap between the contact surface of the pusher block 31 and the piston head 2 to prevent ammonia or gas in the mixing chamber 12 from leaking into the drive chamber 13.

[0076] See Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the driving component 3 includes a driving motor 32 connected to the driving cavity 13 and a main rotating block 33 connected to the driving end of the driving motor 32. A rotating rod 34 is rotatably connected to the main rotating block 33, and the other end of the rotating rod 34 is rotatably connected to the push block 31. An auxiliary rotating block 35 is rotatably connected to the other end of the rotating rod 34, and the auxiliary rotating block 35 is rotatably connected inside the driving cavity 13.

[0077] In this embodiment, after the drive motor 32 starts, its output shaft drives the main rotating block 33 to rotate in a circular motion. The pin on the edge of the main rotating block 33 rotates with it, pulling or pushing one end of the rotating rod 34 to move in a circular trajectory. When the rotating rod 34 moves under the drive of the main rotating block 33, its end is restricted by the auxiliary rotating block 35. The auxiliary rotating block 35 rotates around the fixed pin on the inner wall of the drive cavity 13, converting the circular motion of the rotating rod 34 into an oscillation along the axial direction of the drive cavity 13. The rotating rod 34 pushes the push block 31 through the end pin. Combined with the cooperation between the sliding groove 311 on the push block 31 and the guide component in the drive cavity 13, the push block 31 finally makes the push block 31 reciprocate linearly along the axial direction of the mixing cavity 12, thereby pushing the piston head 2 to slide back and forth in the mixing cavity 12. At the same time, the drive motor 32 is selected according to the actual working conditions, such as a motor of model GM80BLF86-430 or a motor of model RPX32-090V12. The control system for drive motor 32 adopts CS32F031 / CS32F103 or CS32F036Q, and the specific choice depends on the actual application.

[0078] See Figure 1 and Figure 2 As shown, in some embodiments, the discharge chamber 11 is connected to two support blocks 111 at both ends, and a mixing blade 112 is rotatably connected to the support blocks 111. Both support blocks 111 are provided with discharge holes 113.

[0079] In this embodiment, the discharge hole 113 is used to connect the discharge chamber 11 with the nozzle 5 and the mixing chamber 12. The mixing blade 112 rotates under the impact of the material flow, and performs secondary stirring on the ammonia water and gas in the discharge chamber 11 to improve the mixing uniformity.

[0080] See Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, in some embodiments, the nozzle 5 outlet end is connected to a dust-blocking grid 51.

[0081] In this embodiment, the dust-blocking grille 51 is a hollow mesh structure used to intercept dust and particulate matter in the flue gas, preventing dust and particulate matter in the flue gas from entering the nozzle 5. When the dust-blocking grille 51 becomes clogged, it is replaced to ensure spray stability.

[0082] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ammonia injection device for a denitrification system, characterized in that, include: The spray nozzle (1) is provided with a discharge chamber (11), a mixing chamber (12) and a driving chamber (13) from one end to the other. The piston head (2) is slidably connected inside the mixing chamber (12); A drive unit (3) is connected inside the drive cavity (13), and the drive end of the drive unit (3) is connected to the piston head (2); The feed port component (4) includes a first ammonia water feed end (41) and a first gas feed end (42) connected to one side of the mixing chamber (12), and a second gas feed end (43) and a second ammonia water feed end (44) connected to the other side of the mixing chamber (12). The piston head (2) is used to mix the high-pressure ammonia water and high-pressure gas input from the first ammonia water feed end (41), the first gas feed end (42), the second gas feed end (43) and the second ammonia water feed end (44). The nozzle (5) is connected to the spray cylinder (1) and the nozzle (5) is in communication with the discharge chamber (11).

2. The ammonia injection device for a denitrification system according to claim 1, characterized in that, The first ammonia water inlet (41) is connected to the spray cylinder (1); the first gas inlet (42) is connected to the spray cylinder (1), and the first gas inlet (42) and the first ammonia water inlet (41) are arranged parallel to each other along the axial direction of the spray cylinder (1); the second gas inlet (43) is connected to the spray cylinder (1), and the second gas inlet (43) and the first ammonia water inlet (41) are arranged symmetrically along the radial direction of the spray cylinder (1); the second ammonia water inlet (44) is connected to the spray cylinder (1), and the second ammonia water inlet (44) and the first gas inlet (42) are arranged symmetrically along the radial direction of the spray cylinder (1); the second ammonia water inlet (44) is connected to the spray cylinder (1), and the second ammonia water inlet (44) and the first gas inlet (42) are arranged symmetrically along the radial direction of the spray cylinder (1). The spray nozzle (1) is arranged radially symmetrically; it also includes an ammonia tank (45) and a gas storage tank (46). The ammonia tank (45) is connected to a first ammonia pipe (451) and a second ammonia pipe (452). The first ammonia pipe (451) is connected to the first ammonia inlet (41), and the second ammonia pipe (452) is connected to the second ammonia inlet (44). The gas storage tank (46) is connected to a first gas pipe (461) and a second gas pipe (462). The first gas pipe (461) is connected to the first gas inlet (42), and the second gas pipe (462) is connected to the second gas inlet (43).

3. The ammonia injection device for a denitrification system according to claim 2, characterized in that, The first ammonia pipe (451) and the second ammonia pipe (452) are connected to a pressure regulator (48) at one end near the ammonia tank (45).

4. The ammonia injection device for a denitrification system according to claim 1, characterized in that, A one-way valve (47) is connected to the first ammonia water inlet (41), the first gas inlet (42), the second gas inlet (43), and the second ammonia water inlet (44).

5. The ammonia injection device for a denitrification system according to claim 1, characterized in that, The piston head (2) is provided with a piston through hole (21). The piston head (2) is configured such that when the piston head (2) moves to one end of the mixing chamber (12), the piston head (2) blocks the first ammonia water inlet (41) and the first gas inlet (42) so that the second gas inlet (43) and the second ammonia water inlet (44) are connected to the mixing chamber (12); when the piston head (2) moves to the other end of the mixing chamber (12), the piston head (2) blocks the second gas inlet (43) and the second ammonia water inlet (44) so ​​that the first ammonia water inlet (41) and the first gas inlet (42) are connected to the mixing chamber (12).

6. The ammonia injection device for a denitrification system according to claim 1, characterized in that, The mixing chamber (12) is connected to a limiting block (121), and the driving component (3) includes a push block (31) slidably connected to the mixing chamber (12). The push block (31) has a groove (311) and the groove (311) is slidably connected to the limiting block (121).

7. The ammonia injection device for a denitrification system according to claim 6, characterized in that, The pusher (31) has a sealing gasket (6) connected to one end near the piston head (2).

8. The ammonia injection device for a denitrification system according to claim 6, characterized in that, The driving component (3) includes a driving motor (32) connected to the driving cavity (13) and a main rotating block (33) connected to the driving end of the driving motor (32). A rotating rod (34) is rotatably connected to the main rotating block (33), and the other end of the rotating rod (34) is rotatably connected to the push block (31). An auxiliary rotating block (35) is rotatably connected to the other end of the rotating rod (34), and the auxiliary rotating block (35) is rotatably connected inside the driving cavity (13).

9. The ammonia injection device for a denitrification system according to claim 1, characterized in that, The discharge chamber (11) is connected to two support blocks (111) at both ends. A mixing blade (112) is rotatably connected to the support block (111). Discharge holes (113) are opened on both support blocks (111).

10. The ammonia injection device for a denitrification system according to claim 1, characterized in that, The nozzle (5) is connected to a dust-blocking grid (51) at its outlet end.

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