SNCR (selective non-catalytic reduction) denitration system pipeline emptying device

Abstract

The utility model relates to the technical field of SNCR (Selective Non-Catalytic Reduction) denitration pipelines, and discloses an SNCR denitration system pipeline emptying device, which comprises a solution infusion pump, a dilution water pump and a mixer, the output ends of the solution infusion pump and the dilution water pump are connected with infusion pipelines, and the two infusion pipelines are connected with a monofilament head between a flowmeter and a check valve. The end part of the monofilament head is connected with a second ball valve, and the two liquid conveying pipelines are provided with auxiliary emptying mechanisms for purging the flushing liquid in the liquid conveying pipelines, so that the internal and external pressures of the liquid conveying pipelines are balanced in the emptying process of the flushing liquid, and the formation of negative pressure is avoided, so that the flushing liquid is completely emptied, and no residue exists in the liquid conveying pipelines; the liquid conveying pipeline can be effectively prevented from being blocked and corroded, the auxiliary emptying mechanism is arranged, the flushing liquid emptying effect can be further improved, it is ensured that the interior of the liquid conveying pipeline is clean and free of residues, and therefore the service life of the whole liquid conveying pipeline is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of SNCR denitrification pipeline technology, specifically to an SNCR denitrification system pipeline venting device. Background Technology

[0002] SNCR (Selective Non-Catalytic Reduction) is a process in which nitrogen oxides in flue gas are reduced to harmless nitrogen and water by injecting a reducing agent within a suitable temperature window for the denitrification reaction without the action of a catalyst. This technology generally uses ammonia, urea, or hydrocyanic acid injected into the furnace as a reducing agent to reduce NOx. The reducing agent only reacts with NOx in the flue gas and generally does not react with oxygen. This technology does not use a catalyst, so this method is called Selective Non-Catalytic Reduction (SNCR).

[0003] Currently, in SNCR denitrification, when the urea (ammonia) solution infusion pump stops operating, its pipeline needs to be flushed to prevent solution crystallization. After flushing, the vent valve at the pump outlet is opened to release the odor. With this venting method, the solution in the pipeline near the valve can be released smoothly after opening the vent valve. However, due to the presence of a check valve in the urea (ammonia) solution pipeline before the mixer, a negative pressure is formed before the check valve, preventing the flushing fluid from being completely released. The solution remaining in the pipeline may freeze and clog the pipeline at low temperatures, affecting the system's restart. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a pipeline venting device for an SNCR denitrification system, thereby resolving the problems mentioned in the background section.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a pipeline venting device for an SNCR denitrification system, comprising a solution delivery pump, a dilution water pump, and a mixer. The output ends of the solution delivery pump and the dilution water pump are both connected to delivery pipelines, and the other ends of the two delivery pipelines are both connected to the mixer. A spray gun is connected to one side of the mixer. A first ball valve, a filter, a flow meter, and a check valve are sequentially arranged on each of the two delivery pipelines. The first ball valve is located on the side of the delivery pipeline near the solution delivery pump or the dilution water pump, and the check valve is located on the side of the delivery pipeline near the mixer. A single-wire head is connected to the two delivery pipelines at a position between the flow meter and the check valve. A second ball valve is connected to the end of the single-wire head. An auxiliary venting mechanism for purging the internal flushing fluid is provided on the two delivery pipelines.

[0006] Furthermore, the infusion pipeline includes a first pipeline and a second pipeline, and the auxiliary venting mechanism is installed at the connection between the first pipeline and the second pipeline.

[0007] Furthermore, the auxiliary venting mechanism includes an installation cylinder, an annular baffle, an annular fixing plate, a sealing assembly for sealing the first pipe and the second pipe, and a driving assembly for moving the sealing assembly. The installation cylinder is installed at the connection between the first pipe and the second pipe, and the first pipe and the second pipe extend to both sides inside the installation cylinder, respectively. The annular fixing plate is fixedly sleeved on the outer wall of the second pipe, and the annular baffle is fixedly sleeved on the outer wall of the first pipe. A movable cavity is formed between the annular baffle and the annular fixing plate. The sealing assembly is disposed in the movable cavity and is slidably and sealingly connected to the first pipe. The driving assembly is mounted on the output shaft of the annular baffle and fixedly connected to the sealing assembly.

[0008] Furthermore, the sealing assembly includes a sealing tube, a protective plate, and a guide funnel. The sealing tube is slidably disposed at the end of the first pipe, the protective plate is fixedly sleeved on the outer wall of the sealing tube, the guide funnel is fixedly sleeved on the sealing tube, and the open end of the guide funnel faces the second pipe, while the other end of the guide funnel is fixedly connected to the protective plate.

[0009] Furthermore, a blower assembly is installed on the outer wall of the annular fixed plate away from the sealing assembly. The output end of the blower assembly passes through the annular fixed plate and extends into the movable cavity, while the input end of the blower assembly passes through the mounting cylinder and extends to the outside of the mounting cylinder.

[0010] Furthermore, the length of the closed tube is greater than the distance between the first pipe and the second pipe, and the inner diameter of the closed tube is equal to the inner diameter of the first pipe or the second pipe.

[0011] Furthermore, a drain pipe is connected to the bottom of the mounting cylinder, the drain pipe is located below the movable cavity, and a valve is installed on the drain pipe.

[0012] Furthermore, the guide funnel is funnel-shaped, and the outer edge of the guide funnel is in contact with the inner wall of the mounting cylinder. The outer edges of the annular baffle, the annular fixing plate, and the protective plate are all in contact with the inner wall of the mounting cylinder.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This utility model, through the setting of the second ball valve, can open the second ball valve to vent after the infusion pipeline is flushed, ensuring that the pressure inside and outside the infusion pipeline is balanced during the venting process, avoiding the formation of negative pressure, so that the flushing fluid is completely vented, ensuring that there are no residues inside the infusion pipeline, effectively preventing blockage and corrosion of the infusion pipeline, improving the operating efficiency and stability of the SNCR denitrification system, and avoiding the problem that the solution left in the infusion pipeline may freeze and cause blockage when the temperature is low.

[0015] 2. By setting up an auxiliary evacuation mechanism, this utility model can further improve the evacuation effect of the flushing fluid, ensuring that the inside of the infusion pipeline is clean and free of residue, providing favorable conditions for the subsequent delivery of urea solution, thereby extending the service life of the entire infusion pipeline. With the use of the blowing component, it can effectively accelerate the discharge of flushing fluid, and can also further clean the inner wall of the infusion pipeline through the flow of gas, improving the smoothness of the inner wall of the infusion pipeline and reducing the adhesion of dirt. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the connection structure of a pipeline venting device for an SNCR denitrification system according to this utility model;

[0017] Figure 2 This is a schematic diagram of the overall structure of a pipeline venting device for an SNCR denitrification system according to this utility model;

[0018] Figure 3 This is a cross-sectional view of the auxiliary venting mechanism of this utility model;

[0019] Figure 4 This is a partial structural diagram of the closed component of this utility model.

[0020] In the diagram: 1. Solution infusion pump; 2. Dilution water pump; 3. Mixer; 4. Infusion pipeline; 5. Spray gun; 6. First ball valve; 7. Filter; 8. Flow meter; 9. Check valve; 10. Single thread end; 11. Second ball valve; 12. Auxiliary venting mechanism; 13. Drain pipe;

[0021] 41. First pipe; 42. Second pipe; 121. Mounting cylinder; 122. Annular baffle; 123. Annular fixing plate; 124. Sealing assembly; 125. Driving assembly; 126. Movable cavity; 127. Sealing pipe; 128. Protective plate; 129. Guide funnel; 130. Blowing assembly. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Please see Figures 1 to 4This utility model provides a pipeline venting device for an SNCR denitrification system, including a solution delivery pump 1, a dilution water pump 2, and a mixer 3. The output ends of the solution delivery pump 1 and the dilution water pump 2 are both connected to delivery pipelines 4, and the other ends of the two delivery pipelines 4 are both connected to the mixer 3. A spray gun 5 is connected to one side of the mixer 3. A first ball valve 6, a filter 7, a flow meter 8, and a check valve 9 are sequentially arranged on the two delivery pipelines 4. The first ball valve 6 is located on the side of the delivery pipeline 4 near the solution delivery pump 1 or the dilution water pump 2, and the check valve 9 is located on the side of the delivery pipeline 4 near the mixer 3. A single-wire head 10 is connected to the two delivery pipelines 4 at the position between the flow meter 8 and the check valve 9. A second ball valve 11 is connected to the end of the single-wire head 10. An auxiliary venting mechanism 12 for purging the internal flushing liquid is provided on the two delivery pipelines 4.

[0024] After the solution infusion pump 1 for urea stops running, the infusion pipeline 4 is flushed. Then, after flushing, the first ball valve 6 at the outlet of the solution infusion pump 1 is opened, and the second ball valve 11 is opened simultaneously to vent. This ensures that the pressure inside and outside the infusion pipeline 4 is balanced during the venting process, avoiding the formation of negative pressure and ensuring that the flushing solution is completely vented. Similarly, the venting method for the infusion pipeline 4 connected to the dilution water pump 2 is the same, ensuring that there are no residues inside the infusion pipeline 4, effectively preventing blockage and corrosion of the infusion pipeline 4, and improving the operating efficiency and stability of the SNCR denitrification system.

[0025] The first ball valve 6 allows operators to quickly disconnect the solution infusion pump 1 or dilution water pump 2 from the infusion pipeline 4 when needed, facilitating equipment maintenance and repair. Furthermore, the check valve 9 prevents backflow of the flushing fluid during the venting process, further ensuring the flushing effect. The combination of the single-thread head 10 and the second ball valve 11 makes the venting operation more flexible and convenient. This invention provides a reasonable, short-construction-cycle, low-cost, and pollution-free venting method, effectively draining the flushing fluid from the infusion pipeline 4, improving operational convenience and safety, as well as system stability and reliability, and preventing the solution remaining in the infusion pipeline 4 from freezing and clogging the pipeline at low temperatures.

[0026] The infusion pipeline 4 includes a first pipeline 41 and a second pipeline 42, and an auxiliary venting mechanism 12 is installed at the connection between the first pipeline 41 and the second pipeline 42.

[0027] The auxiliary venting mechanism 12 includes a mounting cylinder 121, an annular baffle 122, an annular fixing plate 123, a sealing assembly 124 for sealing the first pipe 41 and the second pipe 42, and a driving assembly 125 for driving the sealing assembly 124 to move. The mounting cylinder 121 is installed at the connection between the first pipe 41 and the second pipe 42, and the first pipe 41 and the second pipe 42 extend to the inner sides of the mounting cylinder 121, respectively. The annular fixing plate 123 is fixedly sleeved on the outer wall of the second pipe 42, and the annular baffle 122 is fixedly sleeved on the outer wall of the first pipe 41. A movable cavity 126 is formed between the annular baffle 122 and the annular fixing plate 123. The sealing assembly 124 is disposed in the movable cavity 126 and is slidably connected to the first pipe 41. The driving assembly 125 is installed on the output shaft of the annular baffle 122 and is fixedly connected to the sealing assembly 124.

[0028] When the SNCR denitrification system is operating normally, the sealing component 124 seals the distance between the first pipe 41 and the second pipe 42, ensuring the normal flow of the infusion pipe 4. After the infusion pipe 4 is flushed, the flushing liquid inside the infusion pipe is initially drained through the second ball valve 11. Subsequently, the sealing component 124 can be moved along the outer wall of the first pipe 41 by the drive component 125, thereby opening the distance between the first pipe 41 and the second pipe 42. The sealing component 124 includes a sealing tube 127, a protective plate 128, and a guide funnel 129. The sealing tube 127 is slidably disposed at the end of the first pipe 41, the protective plate 128 is fixedly sleeved on the outer wall of the sealing tube 127, and the guide funnel 129 is fixedly sleeved on the sealing tube 127, with the open end of the guide funnel 129 facing the second pipe 42, and the other end of the guide funnel 129 is fixedly connected to the protective plate 128.

[0029] A blower assembly 130 is installed on the outer wall of the annular fixing plate 123 away from the sealing assembly 124. The output end of the blower assembly 130 passes through the annular fixing plate 123 and extends into the movable cavity 126. The input end of the blower assembly 130 passes through the mounting cylinder 121 and extends to the outside of the mounting cylinder 121.

[0030] The drive assembly 125 moves the protective plate 128 towards the arc-shaped baffle, thereby causing the closed tube 127 and the guide funnel 129 to move synchronously, thus opening the distance between the first pipe 41 and the second pipe 42. Subsequently, the blowing assembly 130 is opened, allowing gas to be introduced into the active chamber 126. The gas enters the first pipe 41 and the second pipe 42 through the distance between them, thereby purging the flushing fluid in the infusion pipeline 4. The flushing fluid and gas mix and are discharged through the second ball valve 11, facilitating the emptying of the infusion pipeline 4 and preventing the flushing fluid from remaining in the infusion pipeline 4, which would affect the subsequent delivery of the denitrification agent solution. In this process, the blowing assembly 130 not only effectively accelerates the discharge of the flushing fluid but also further cleans the inner wall of the infusion pipeline 4 through the flow of gas, improving the smoothness of the inner wall of the infusion pipeline 4 and reducing the adhesion of dirt. By setting up the auxiliary evacuation mechanism 12, the evacuation effect of the flushing fluid can be further improved, ensuring that the inside of the pipeline is clean and free of residue, thereby extending the service life of the entire infusion pipeline 4.

[0031] Meanwhile, the design of the guide funnel 129 allows gas to enter the space between the first pipe 41 and the second pipe 42 more smoothly, avoiding gas accumulation and blockage at the pipe connection and improving venting efficiency.

[0032] It is worth noting that the drive component 125 in this embodiment can be any mechanism or device that can drive the protective plate 128 to move, such as an electric push rod or screw in the prior art, and the blower component 130 can be any device such as an air pump or fan in the prior art, which can be selected and used according to the actual situation.

[0033] The length of the closed tube 127 is greater than the distance between the first pipe 41 and the second pipe 42, and the inner diameter of the closed tube 127 is equal to the inner diameter of the first pipe 41 or the second pipe 42.

[0034] This design ensures that the sealing tube 127 can be tightly inserted into the distance between the first pipe 41 and the second pipe 42, forming a reliable sealing structure. When the sealing tube 127 is in the working state, that is, inserted into the gap and sealing the infusion pipe 4, it can prevent the solution or flushing fluid from leaking from the gap, ensuring the continuity and efficiency of the purging and emptying process.

[0035] The bottom of the mounting cylinder 121 is connected to a drain pipe 13, which is located below the movable cavity 126. A valve is installed on the drain pipe 13.

[0036] When the sealing assembly 124 is open, the valve is closed; when the sealing assembly 124 closes the infusion pipeline 4, the valve is open. The drain pipe 13 can drain any leaked solution or flushing fluid at the connection between the sealing pipe 127 and the second pipeline 42, preventing solution accumulation inside the mounting cylinder 121 and further avoiding the risk of corrosion and contamination. Simultaneously, this design ensures the stability and reliability of the device during long-term operation.

[0037] The guide funnel 129 is funnel-shaped, and the outer edge of the guide funnel 129 is in contact with the inner wall of the mounting cylinder 121. The outer edges of the annular baffle 122, the annular fixing plate 123 and the protective plate 128 are all in contact with the inner wall of the mounting cylinder 121.

[0038] This design not only ensures that the guide funnel 129 can stably guide the flow of gas or fluid, preventing turbulence or impact during venting, but also effectively reduces the risk of solution or cleaning fluid leakage through its close fit design. The tight fit between the annular baffle 122, the annular fixing plate 123, and the protective plate 128 and the inner wall of the mounting cylinder 121 further enhances the structural stability and sealing of the entire device.

[0039] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pipeline venting device for an SNCR denitrification system, comprising a solution delivery pump (1), a dilution water pump (2), and a mixer (3), wherein the output ends of the solution delivery pump (1) and the dilution water pump (2) are both connected to delivery pipelines (4), the other ends of the two delivery pipelines (4) are both connected to the mixer (3), and a spray gun (5) is connected to one side of the mixer (3), characterized in that: Each of the two infusion pipelines (4) is sequentially equipped with a first ball valve (6), a filter (7), a flow meter (8), and a check valve (9). The first ball valve (6) is located on the side of the infusion pipeline (4) near the solution infusion pump (1) or the dilution water pump (2). The check valve (9) is located on the side of the infusion pipeline (4) near the mixer (3). A single wire head (10) is connected to the two infusion pipelines (4) at the position between the flow meter (8) and the check valve (9). A second ball valve (11) is connected to the end of the single wire head (10). An auxiliary purging mechanism (12) for purging the internal flushing fluid is provided on the two infusion pipelines (4).

2. The venting device for a pipeline in an SNCR denitrification system according to claim 1, characterized in that, The infusion pipeline (4) includes a first pipeline (41) and a second pipeline (42), and the auxiliary venting mechanism (12) is installed at the connection between the first pipeline (41) and the second pipeline (42).

3. The venting device for a pipeline in an SNCR denitrification system according to claim 2, characterized in that, The auxiliary venting mechanism (12) includes a mounting cylinder (121), an annular baffle (122), an annular fixing plate (123), a sealing assembly (124) for sealing the first pipe (41) and the second pipe (42), and a driving assembly (125) for driving the sealing assembly (124) to move. The mounting cylinder (121) is installed at the connection between the first pipe (41) and the second pipe (42), and the first pipe (41) and the second pipe (42) extend to both sides inside the mounting cylinder (121), respectively. The annular fixing plate (123) The annular baffle (122) is fixedly sleeved on the outer wall of the second pipe (42), and the annular baffle (122) is fixedly sleeved on the outer wall of the first pipe (41). A movable cavity (126) is formed between the annular baffle (122) and the annular fixed plate (123). The sealing component (124) is disposed in the movable cavity (126) and the sealing component (124) is slidably connected to the first pipe (41). The driving component (125) is installed on the annular baffle (122), and the output shaft of the driving component (125) is fixedly connected to the sealing component (124).

4. A pipeline venting device for an SNCR denitrification system according to claim 3, characterized in that, The sealing assembly (124) includes a sealing tube (127), a protective plate (128), and a guide funnel (129). The sealing tube (127) is slidably disposed at the end of the first pipe (41). The protective plate (128) is fixedly sleeved on the outer wall of the sealing tube (127). The guide funnel (129) is fixedly sleeved on the sealing tube (127), and the opening end of the guide funnel (129) faces the second pipe (42). The other end of the guide funnel (129) is fixedly connected to the protective plate (128).

5. A pipeline venting device for an SNCR denitrification system according to claim 4, characterized in that, A blower assembly (130) is installed on the outer wall of the annular fixing plate (123) away from the sealing assembly (124). The output end of the blower assembly (130) extends through the annular fixing plate (123) into the movable cavity (126), and the input end of the blower assembly (130) extends through the mounting cylinder (121) to the outside of the mounting cylinder (121).

6. A pipeline venting device for an SNCR denitrification system according to claim 4, characterized in that, The length of the closed tube (127) is greater than the distance between the first pipe (41) and the second pipe (42), and the inner diameter of the closed tube (127) is equal to the inner diameter of the first pipe (41) or the second pipe (42).

7. A pipeline venting device for an SNCR denitrification system according to claim 3, characterized in that, The bottom of the mounting cylinder (121) is connected to a drain pipe (13), which is located below the movable cavity (126) and has a valve installed on it.

8. A pipeline venting device for an SNCR denitrification system according to claim 4, characterized in that, The guide funnel (129) is funnel-shaped, and the outer edge of the guide funnel (129) is in contact with the inner wall of the mounting cylinder (121). The outer edges of the annular baffle (122), the annular fixing plate (123) and the protective plate (128) are all in contact with the inner wall of the mounting cylinder (121).

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