Ammonia gas delivery anti-crystallization system for denitration system

Abstract

The present application relates to a kind of ammonia delivery anti-crystallization systems for denitration system, belong to flue gas denitration technical field, including heat tracing pipeline, product gas pipeline and drain main, multiple sleeves are uniformly and spacedly arranged on the product gas pipeline, sleeve is fixedly sleeved outside product gas pipeline, heat tracing pipeline input end is connected with auxiliary steam module, and heat tracing pipeline is connected with each sleeve by several heat tracing delivery pipes one by one, the sleeve bottom is also connected with drain pipe, and the free end of drain pipe is connected with drain main.The present application can effectively avoid the crystallization problem of denitration ammonia in the conveying process, and guarantee ammonia conveying smooth, temperature is enough, ammonia is uniformly sprayed, greatly improve the operation stability of denitration system.

Description

Technical Field

[0001] This invention relates to an ammonia gas transport and anti-crystallization system for denitrification systems, belonging to the field of flue gas denitrification technology. Background Technology

[0002] The denitrification system in a thermal power plant removes nitrogen oxides from the flue gas by injecting ammonia into the boiler flue gas. Under the action of a catalyst, the ammonia reduces nitrogen oxides in the flue gas to nitrogen and water. To ensure denitrification efficiency, the system typically includes liquid ammonia storage tanks, evaporators, buffer tanks, and ammonia injection grids. The liquid ammonia is vaporized and evenly injected into the flue gas, ensuring thorough mixing between the ammonia and the flue gas and guaranteeing a stable denitrification reaction.

[0003] In actual field operations, ammonia is prone to crystallization on the inner wall of the pipeline and at the ammonia injection grid nozzles during transportation and injection. This is due to factors such as fluctuations in ambient temperature, insufficient pipeline insulation, and residual impurities in the ammonia. This results in poor ammonia transportation and uneven ammonia injection flow. Moreover, crystallization blockage can cause local ammonia escape exceeding the standard, which can not only cause blockage and corrosion of the air preheater, affecting boiler heat exchange efficiency and system safety, but also reduce denitrification efficiency, making it impossible to meet environmental emission requirements. Therefore, improvements are urgently needed. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, this invention designs an ammonia gas transportation and anti-crystallization system for denitrification systems. This system can effectively avoid the crystallization problem of denitrification ammonia gas during transportation, and ensure smooth ammonia gas transportation, sufficient temperature, and uniform ammonia injection, thereby greatly improving the operational stability of the denitrification system.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A system for preventing crystallization of ammonia gas during denitrification includes a heat tracing pipeline, a product gas pipeline, and a drain header. Multiple sleeves are evenly spaced along the product gas pipeline and are fixedly fitted outside the product gas pipeline. The input end of the heat tracing pipeline is connected to an auxiliary steam module, and the heat tracing pipeline is connected to each sleeve through several heat tracing delivery pipes. A drain pipe is also connected to the bottom of each sleeve, and the free end of the drain pipe is connected to the drain header.

[0006] Furthermore, the bottom of the sleeve is connected to the drain pipe via a main drain pipe, a drain valve is installed on the main drain pipe, and a primary drain valve and a secondary drain valve are respectively installed at the input and output ends of the drain valve. A drain bypass pipe is also connected in parallel on the main drain pipe, and a drain bypass valve is installed on the drain bypass pipe. The output end of the drain header is connected to the drain expansion box.

[0007] Furthermore, the heat tracing pipeline is also connected to a purging pipeline, the free end of which is connected to the product gas pipeline. The product gas pipeline is also connected to an venting pipeline, which is located upstream of the first end of the casing. The connection point between the purging pipeline and the product gas pipeline is located downstream of the last end of the casing. The purging pipeline is also connected to a return pipe, the free end of which is connected to the boiler and the venting pipeline respectively.

[0008] Furthermore, the heat tracing pipeline is connected to branch pipes.

[0009] Furthermore, the heat tracing pipeline includes a heat tracing main pipe one and a heat tracing main pipe two connected in parallel.

[0010] Furthermore, the top of the sleeve is connected to multiple heat tracing delivery pipes, and each heat tracing delivery pipe is evenly arranged at equal intervals along the length of the sleeve.

[0011] Furthermore, the sleeve is provided with a guiding mechanism, which includes multiple parallel and spaced guide plates. Each guide plate is arranged at the outlet of each heat tracing delivery pipe. The guiding mechanism also includes a turning mechanism, which includes a translation drive component for driving each guide plate to move synchronously and a flip drive component for driving each guide plate to flip synchronously.

[0012] Furthermore, the translation drive assembly includes a guide slide rod, on which a guide groove is formed along its length. A self-driving drive slider is slidably installed in the guide groove. A scissor hinge frame is hinged to one end of the guide slide rod. The free end of the scissor hinge frame is hinged to the drive slider. Each middle hinge point of the scissor hinge frame is fitted with a hinge shaft. The end of the hinge shaft is fixedly connected to the guide plate.

[0013] Furthermore, the flipping drive assembly includes two V-shaped rods hinged to both ends of the guide slide rod. Each V-shaped rod includes a hinged circular block and a first and second rotating rod fixed to the side of the hinged circular block at a certain angle. A first synchronizing rod is hinged between the two first rotating rods, and a second synchronizing rod is hinged between the two second rotating rods. A moving groove is formed on the second synchronizing rod along its length. Several bent steering rods are slidably engaged in the moving groove. The bent steering rods are Z-shaped, and their free ends are fixedly connected to the hinge shaft one-to-one.

[0014] Furthermore, a connecting pipe is connected between any two adjacent sleeves.

[0015] Compared with the prior art, the present invention has the following features and beneficial effects: This invention utilizes a segmented heat tracing pipeline and sheathing structure to uniformly heat the product gas pipeline from all directions with high-temperature steam, ensuring that the ammonia temperature is consistently above the crystallization point. This fundamentally solves the problem of ammonia crystallization caused by ambient temperature fluctuations or insufficient pipeline insulation. Furthermore, the segmented design allows for isolated maintenance in case of steam leakage in a single section without affecting the safe operation of the entire main pipeline. The condensate drainage system automatically discharges condensate and prevents steam leakage. Parallel bypass channels ensure continuous system operation even in the event of a condensate trap failure. The purging and draining pipelines are self-cleaning, allowing for reverse purging of the pipeline inner walls with high-temperature steam during shutdown to effectively remove residual gases. By retaining crystals and impurities and cooperating with the return tube to achieve heat recovery, it not only ensures uniform injection of ammonia through the injection grid, but also avoids a chain reaction of problems such as air preheater blockage and corrosion and decreased denitrification efficiency caused by excessive ammonia escape. The dual-parallel heat tracing main pipe design realizes the main and backup switching function. If one line fails, the other line can be put into operation immediately to ensure uninterrupted heating and greatly improve the operational reliability of the system. The translation and flipping adjustment function of the guide mechanism inside the casing allows high-temperature steam to purge all parts of the pipeline with a variable diffusion range and direction, avoiding temperature unevenness caused by single-point purging. This not only prevents thermal stress decomposition of ammonia due to uneven heating, but also improves the anti-crystallization effect and the stability of system operation. Attached Figure Description

[0016] Figure 1 This is a system connection diagram of the present invention; Figure 2 yes Figure 1 A magnified schematic diagram of the structure at point A; Figure 3 This is a schematic diagram of the internal structure of the sleeve of the present invention; Figure 4 This is a three-dimensional structural diagram of the guiding mechanism of the present invention from a first-view perspective; Figure 5 This is a three-dimensional structural schematic diagram of the guiding mechanism of the present invention from a second perspective; Figure 6 This is the present invention. Figure 5 A magnified schematic diagram of the structure at point B.

[0017] The attached diagrams are labeled as follows: 100, Heat Tracing Main Pipe 1; 200, Heat Tracing Main Pipe 2; 300, Product Gas Pipe 1; 301, Isolation Valve 1; 302, Drain Pipe 1; 303, Purge Pipe 1; 304, Return Pipe 1; 305, Sleeve; 400, Product Gas Pipe 2; 401, Isolation Valve 2; 402, Drain Pipe 2; 403, Purge Pipe 2; 404, Return Pipe 2; 405, Drain Pipe 3; 500, Drainage Main Pipe; 600, Heat Tracing Delivery Pipe; 700, Connecting Pipe; 8 00. Branch pipe; 900. Drainage pipe; 901. Main drain pipe; 902. Drainage bypass pipe; 903. Drainage expansion box; 1. Guide mechanism; 11. Guide slide rod; 111. Drive slider; 112. Guide groove; 12. Scissor hinge frame; 121. Hinge shaft; 13. First turn lever; 131. First synchronizing rod; 14. Second turn lever; 141. Second synchronizing rod; 142. V-shaped rod; 143. Turning groove; 15. Bending steering rod; 2. Guide plate. Detailed Implementation

[0018] The present invention will now be described in more detail with reference to the embodiments.

[0019] Example 1 Please see Figure 1 and Figure 2 The ammonia gas transportation and anti-crystallization system for the denitrification system in this embodiment includes a heat tracing pipeline, a product gas pipeline, and a condensate header 500.

[0020] In this embodiment, the heat tracing pipeline includes a heat tracing main pipe 100 and a heat tracing main pipe 200, one as the main pipe and one as a backup, to prevent the failure of one heat tracing pipeline from causing the collapse of the entire system.

[0021] In this embodiment, two product air lines are also provided, namely product air line 300 and product air line 400.

[0022] Two sleeves 305 are evenly spaced on both product air pipe 1 300 and product air pipe 2 400. The sleeves 305 are fixedly sleeved outside the product air pipe. That is, in this embodiment, a total of four sleeves 305 are arranged.

[0023] Both the 100 input terminal of the heat tracing main pipe and the 200 input terminal of the heat tracing main pipe are connected to the auxiliary steam module.

[0024] In this embodiment, the heat tracing pipeline is connected to each sleeve 305 in a corresponding manner through several heat tracing delivery pipes 600. The bottom of the sleeve 305 is also connected to a drain pipe 900, and the free end of the drain pipe 900 is connected to the drainage header 500.

[0025] Specifically, please refer to Figure 2The first heat tracing main pipe 100 is connected to two of the two sleeves 305 respectively through two heat tracing delivery pipes 600, and the second heat tracing main pipe 200 is connected to two of the two outer sleeves 305 respectively through two heat tracing delivery pipes 600.

[0026] Please see Figure 2 The bottom of the sleeve 305 is connected to the drain pipe 900 via the main drain pipe 901. A drain valve is installed on the main drain pipe 901. The input and output ends of the drain valve are respectively equipped with a primary drain valve and a secondary drain valve. A drain bypass pipe 902 is also connected in parallel to the main drain pipe 901. A drain bypass valve is installed on the drain bypass pipe 902. At the same time, the output end of the drain header 500 is connected to the drain expansion box 903.

[0027] The heat tracing pipeline is also connected to a purging pipeline. The free end of the purging pipeline is connected to the product gas pipeline. The product gas pipeline is also connected to an venting pipeline. The venting pipeline is located upstream of the first end of the sleeve 305. The connection point between the purging pipeline and the product gas pipeline is located downstream of the last end of the sleeve 305. The purging pipeline is also connected to a return pipe. The free end of the return pipe is connected to the boiler and the venting pipe 405.

[0028] Specifically, please refer to Figure 1 The heat tracing main pipe 100 is connected to the product gas pipe 300 through the purge pipe 303.

[0029] The heat tracing main pipe 200 is connected to the product gas pipe 200 via the purge pipe 203.

[0030] The purge pipe 303 is connected to the boiler and the vent pipe 405 via the return pipe 304.

[0031] The purge pipe 2 403 is connected to the boiler and the vent pipe 3 405 via the return pipe 2 404.

[0032] Please see Figure 2 The venting pipeline includes venting pipe one 302 and venting pipe two 402. Venting pipe one 302 is connected to product gas pipe one 300, and venting pipe two 402 is connected to product gas pipe two 400.

[0033] An isolation valve 301 is installed upstream of vent pipe 1 302, and an isolation valve 2 401 is installed upstream of vent pipe 2 402.

[0034] In this embodiment, the 305 sleeve is made of 316L material, which has the advantages of being less prone to corrosion, suitable for the harsh working conditions of denitrification urea pipelines, and preventing rust and perforation of the inner wall of the jacket. Here, L represents ultra-low carbon (carbon content ≤0.03%), which makes it less prone to intergranular corrosion under high-temperature steam tracing and alternating hot and cold conditions. The material stability during long-term high-temperature service is far superior to that of ordinary 304 stainless steel pipes.

[0035] Meanwhile, under conditions of high-speed steam flow and humid and corrosive external environment, 316L material pipes are more wear-resistant and corrosion-resistant, which can reduce the frequency of maintenance and replacement, reduce the failure rate of heat tracing pipelines in denitrification systems, and 316L material has excellent welding performance, making maintenance and replacement convenient.

[0036] Furthermore, the heat tracing pipeline is connected to a branch pipe 800, which can provide a heat source to other equipment that requires heat tracing as needed.

[0037] Furthermore, a connecting pipe 700 is connected between any two adjacent sleeves 305 to ensure smooth ammonia delivery and pressure balance.

[0038] As can be seen from the above description, during operation, the high-temperature steam generated by the auxiliary steam module is simultaneously sent to the parallel-connected heat tracing header 100 and heat tracing header 200, one of which serves as the main heat tracing source and the other as a backup.

[0039] After the high-temperature steam flows out from the first heating header 100 and the second heating header 200, it enters the interior of each fixed sleeve 305 outside the product gas pipeline through several heating delivery pipes 600. The high-temperature steam entering the sleeve 305 heats the first product gas pipeline 300 and the second product gas pipeline 400 inside the sleeve 305 in all directions and evenly, so that the temperature of the ammonia flowing through the product gas pipeline is always maintained above the crystallization point, effectively preventing ammonia crystallization and precipitation caused by ambient temperature fluctuations or insufficient pipeline insulation.

[0040] The condensate formed after the high-temperature steam releases heat in the sleeve 305 collects at the bottom of the sleeve 305, and flows into the condensate header 500 through the condensate main pipe 901 and the drain pipe 900 in sequence, and finally enters the condensate expansion tank 903 for centralized treatment.

[0041] The steam trap installed on the main steam trap 901 can automatically discharge condensate while preventing steam leakage. The primary steam trap valve and the secondary steam trap valve are used to control the flow of steam. The parallel steam trap bypass pipe 902 and its bypass valve provide a bypass channel when the steam trap fails or needs maintenance, ensuring continuous operation of the system.

[0042] When the system is shut down or the product gas pipeline needs cleaning and maintenance, the high-temperature steam in the heat tracing main pipe 100 and heat tracing main pipe 200 can be introduced into the product gas pipeline 300 and product gas pipeline 400 respectively through the purge pipe 303 and purge pipe 403. After entering the product gas pipeline from the downstream, the high-temperature steam flows in the opposite direction to purge and melt any small amount of crystals or impurities that may be attached to the inner wall of the pipeline. The melted material and the purge steam continue to flow forward with the airflow and are finally safely discharged from the system through the upstream vent pipe 302 and vent pipe 402.

[0043] The purge pipe 1 303 and purge pipe 2 403 are also connected to the boiler and the vent pipe 3 405 respectively through the return pipe 1 304 and the return pipe 2 404. The high-temperature steam after purging can be sent back to the boiler to recover heat energy, or safely discharged through the vent pipe 3 405.

[0044] Isolation valve 301 and isolation valve 401 are respectively located upstream of vent pipe 302 and vent pipe 402, and are used to cut off the venting channel during normal operation and only open during purging.

[0045] Example 2 Please see Figures 3 to 6 In this embodiment, the ammonia gas conveying and anti-crystallization system for the denitrification system is based on the above embodiment one. Multiple heat tracing conveying pipes 600 are connected to the top of the sleeve 305, and each heat tracing conveying pipe 600 is evenly arranged at equal intervals along the length of the sleeve 305.

[0046] Please see Figure 3 The sleeve 305 is provided with a guide mechanism 1. The guide mechanism 1 includes multiple guide plates 2 arranged in parallel and spaced apart. Each guide plate 2 is arranged at the outlet of each heat tracing conveying pipe 600. The guide mechanism 1 also includes a turning mechanism. The turning mechanism includes a translation drive component for driving each guide plate 2 to move synchronously and a turning drive component for driving each guide plate 2 to flip synchronously.

[0047] Specifically, please refer to Figures 4 to 6 The translation drive assembly includes a guide slide rod 11, a guide groove 112 is provided along the length direction of the guide slide rod 11, a self-driven drive slider 111 is slidably installed in the guide groove 112, a scissor hinge frame 12 is hinged to one end of the guide slide rod 11, the free end of the scissor hinge frame 12 is hinged to the drive slider 111, and each middle hinge point of the scissor hinge frame 12 is sleeved with a hinge shaft 121, the end of the hinge shaft 121 is fixedly connected to the guide plate 2.

[0048] Specifically, the flipping drive assembly includes two V-shaped rods 142 hinged to both ends of the guide slide rod 11, and a drive motor for rotating one of the V-shaped rods 142 is provided inside the guide slide rod 11.

[0049] V-shaped rod 142 includes a hinged circular block and a first rotating rod 13 and a second rotating rod 14 fixed to the side of the hinged circular block at a certain angle. The two first rotating rods 13 are connected by a hinged first synchronizing rod 131, and the two second rotating rods 14 are connected by a hinged second synchronizing rod 141. The second synchronizing rod 141 has a moving groove 143 along its length direction. Several bent turning rods 15 are slidably engaged in the moving groove 143. The bent turning rods 15 are Z-shaped, and the free ends of the bent turning rods 15 are fixedly connected to the hinge shaft 121 one by one.

[0050] As can be seen from the above description, when the translation drive assembly is working, the self-driven drive slider 111 slides along the guide groove 112 on the guide slide rod 11, which drives the scissor hinge frame 12 hinged to the drive slider 111 to extend or retract. The hinge shaft 121 sleeved on each middle hinge point of the scissor hinge frame 12 drives each guide plate 2 to translate synchronously, thereby adjusting the relative position of the guide plate 2 and the outlet of the heat tracing conveying pipe 600 to ensure the guiding effect.

[0051] When the flip drive assembly is working, the drive motor periodically drives the two V-shaped rods 142 to rotate (or reverse) around the hinge block. The first turn rods 13 of the two V-shaped rods 142 maintain synchronous movement through the first synchronizing rod 131, and the second turn rods 14 maintain synchronous movement through the second synchronizing rod 141. When the second synchronizing rod 141 rotates, the turning groove 143 on it drives each bending and turning rod 15 to swing. The bending and turning rod 15 then drives the hinge shaft 121 and guide plate 2 fixedly connected to it to rotate synchronously, thereby adjusting the tilt angle of the guide plate 2 to change the direction of steam injection. Through the combination of translation and flipping adjustment of the guide plate 2, high-temperature steam can evenly cover all parts of the product gas pipeline with a suitable diffusion range and direction, avoiding local overheating or local underheating.

[0052] The working principle of this invention is as follows: During operation, the high-temperature steam generated by the auxiliary steam module is simultaneously fed into the parallel-connected heat tracing header 100 and heat tracing header 200, one of which serves as the main heat tracing source and the other as a backup.

[0053] After the high-temperature steam flows out from the first heating header 100 and the second heating header 200, it enters the interior of each fixed sleeve 305 outside the product gas pipeline through several heating delivery pipes 600. The high-temperature steam entering the sleeve 305 heats the first product gas pipeline 300 and the second product gas pipeline 400 inside the sleeve 305 in all directions and evenly, so that the temperature of the ammonia flowing through the product gas pipeline is always maintained above the crystallization point, effectively preventing ammonia crystallization and precipitation caused by ambient temperature fluctuations or insufficient pipeline insulation.

[0054] The condensate formed after the high-temperature steam releases heat in the sleeve 305 collects at the bottom of the sleeve 305, and flows into the condensate header 500 through the condensate main pipe 901 and the drain pipe 900 in sequence, and finally enters the condensate expansion tank 903 for centralized treatment.

[0055] The steam trap installed on the main steam trap 901 can automatically discharge condensate while preventing steam leakage. The primary steam trap valve and the secondary steam trap valve are used to control the flow of steam. The parallel steam trap bypass pipe 902 and its bypass valve provide a bypass channel when the steam trap fails or needs maintenance, ensuring continuous operation of the system.

[0056] When the system is shut down or the product gas pipeline needs cleaning and maintenance, the high-temperature steam in the heat tracing main pipe 100 and heat tracing main pipe 200 can be introduced into the product gas pipeline 300 and product gas pipeline 400 respectively through the purge pipe 303 and purge pipe 403. After entering the product gas pipeline from the downstream, the high-temperature steam flows in the opposite direction to purge and melt any small amount of crystals or impurities that may be attached to the inner wall of the pipeline. The melted material and the purge steam continue to flow forward with the airflow and are finally safely discharged from the system through the upstream vent pipe 302 and vent pipe 402.

[0057] The purge pipe 1 303 and purge pipe 2 403 are also connected to the boiler and the vent pipe 3 405 respectively through the return pipe 1 304 and the return pipe 2 404. The high-temperature steam after purging can be sent back to the boiler to recover heat energy, or safely discharged through the vent pipe 3 405.

[0058] Isolation valve 301 and isolation valve 401 are respectively located upstream of vent pipe 302 and vent pipe 402, and are used to cut off the venting channel during normal operation and only open during purging.

[0059] The connecting pipe 700 between adjacent sleeves 305 connects the product gas pipelines of each section, ensuring smooth ammonia delivery and pressure balance. The branch pipe 800 can provide heat source to other equipment that needs heat tracing as needed.

[0060] Inside the sleeve 305, high-temperature steam ejected from multiple heat tracing and conveying pipes 600 arranged at equal intervals along the length of the sleeve 305 first impacts each guide plate 2. Through the cooperation of the translation drive component and the flip drive component in the turning mechanism, the attitude of the guide plate 2 can be adjusted.

[0061] When the translation drive assembly is working, the self-driven drive slider 111 slides along the guide groove 112 on the guide slide rod 11, which drives the scissor hinge frame 12, which is hinged to the drive slider 111, to extend or retract. The hinge shaft 121 sleeved on each middle hinge point of the scissor hinge frame 12 drives each guide plate 2 to translate synchronously, thereby adjusting the relative position of the guide plate 2 and the outlet of the heat tracing conveying pipe 600, adapting to the outlet of the heat tracing conveying pipe 600 at different positions, and ensuring the guiding effect.

[0062] When the flip drive assembly is working, the drive motor drives the two V-shaped rods 142 to rotate around the hinge block. The first turn rods 13 of the two V-shaped rods 142 maintain synchronous movement through the first synchronizing rod 131, and the second turn rods 14 maintain synchronous movement through the second synchronizing rod 141. When the second synchronizing rod 141 rotates, the turning groove 143 on it drives each bending turning rod 15 to swing. The bending turning rod 15 then drives the hinge shaft 121 and guide plate 2 fixedly connected to it to rotate synchronously, thereby adjusting the tilt angle of the guide plate 2 to change the direction of steam injection. Through the combination of translation and flipping adjustment of the guide plate 2, uneven temperature distribution caused by single-point purging is avoided, thereby avoiding local overheating or local underheating.

[0063] In the description of this invention, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0064] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. An ammonia gas conveying and anti-crystallization system for a denitrification system, characterized in that: It includes a heat tracing pipeline, a product gas pipeline, and a drain header (500). Multiple sleeves (305) are evenly spaced on the product gas pipeline. The sleeves (305) are fixedly fitted outside the product gas pipeline. The input end of the heat tracing pipeline is connected to the auxiliary steam module. The heat tracing pipeline is connected to each sleeve (305) through several heat tracing delivery pipes (600). The bottom of each sleeve (305) is also connected to a drain pipe (900). The free end of the drain pipe (900) is connected to the drain header (500).

2. The ammonia gas conveying and anti-crystallization system for a denitrification system according to claim 1, characterized in that: The bottom of the sleeve (305) is connected to the drain pipe (900) through the main drain pipe (901). A drain valve is provided on the main drain pipe (901). The input end and output end of the drain valve are respectively provided with a primary drain valve and a secondary drain valve. A drain bypass pipe (902) is also connected in parallel on the main drain pipe (901). A drain bypass valve is provided on the drain bypass pipe (902). The output end of the drain header (500) is connected to the drain expansion box (903).

3. The ammonia gas conveying and anti-crystallization system for a denitrification system according to claim 1, characterized in that: The heat tracing pipeline is also connected to a purging pipeline. The free end of the purging pipeline is connected to the product gas pipeline. The product gas pipeline is also connected to an venting pipeline. The venting pipeline is located upstream of the first end of the sleeve (305). The connection point between the purging pipeline and the product gas pipeline is located downstream of the last end of the sleeve (305). The purging pipeline is also connected to a return pipe. The free end of the return pipe is connected to the boiler and the venting pipe (405) respectively.

4. The ammonia gas conveying and anti-crystallization system for a denitrification system according to claim 1, characterized in that: The heat tracing pipeline is connected to a branch pipe (800).

5. An ammonia gas conveying and anti-crystallization system for a denitrification system according to claim 1, characterized in that: The heat tracing pipeline includes a heat tracing main pipe one (100) and a heat tracing main pipe two (200) connected in parallel.

6. An ammonia gas conveying and anti-crystallization system for a denitrification system according to claim 1, characterized in that: The top of the sleeve (305) is connected to multiple heat tracing delivery pipes (600), and each heat tracing delivery pipe (600) is evenly arranged at equal intervals along the length of the sleeve (305).

7. An ammonia gas conveying and anti-crystallization system for a denitrification system according to claim 6, characterized in that: The sleeve (305) is provided with a guide mechanism (1), which includes multiple parallel spaced guide plates (2). Each guide plate (2) is arranged at the outlet of each heat tracing conveying pipe (600). The guide mechanism (1) also includes a turning mechanism, which includes a translation drive component for driving each guide plate (2) to move synchronously and a flip drive component for driving each guide plate (2) to flip synchronously.

8. An ammonia gas conveying and anti-crystallization system for a denitrification system according to claim 7, characterized in that: The translation drive assembly includes a guide slide rod (11), a guide groove (112) is provided on the guide slide rod (11) along the length direction, a self-driven drive slider (111) is slidably installed in the guide groove (112), a scissor hinge frame (12) is hinged to one end of the guide slide rod (11), the free end of the scissor hinge frame (12) is hinged to the drive slider (111), and each middle hinge point of the scissor hinge frame (12) is sleeved with a hinge shaft (121), the end of the hinge shaft (121) is fixedly connected to the guide plate (2).

9. An ammonia gas conveying and anti-crystallization system for a denitrification system according to claim 8, characterized in that: The flipping drive assembly includes two V-shaped rods (142) hinged to both ends of the guide slide rod (11). The V-shaped rod (142) includes a hinged circular block and a first rotating rod (13) and a second rotating rod (14) fixed to the side of the hinged circular block at a certain angle. A first synchronizing rod (131) is hinged between the two first rotating rods (13), and a second synchronizing rod (141) is hinged between the two second rotating rods (14). A rotating groove (143) is provided on the second synchronizing rod (141) along the length direction. Several bent steering rods (15) are slidably engaged in the rotating groove (143). The bent steering rods (15) are Z-shaped, and the free ends of the bent steering rods (15) are fixedly connected to the hinge shaft (121) one by one.

10. An ammonia gas conveying and anti-crystallization system for a denitrification system according to claim 1, characterized in that: A connecting pipe (700) is connected between any two adjacent sleeves (305).

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