Urea solution conveying pipeline structure and denitration system

Abstract

The invention discloses a urea solution conveying pipeline structure and a denitration system, which are used for reducing fine impurities in a urea solution so as to reduce the condition that a spray gun is blocked. The system comprises a urea solution pipeline, a demineralized water pipeline, a first filtering pipeline and a static mixer, the urea solution pipeline and the demineralized water pipeline are respectively connected with a liquid inlet end of the static mixer, and the static mixer is used for mixing a urea solution and demineralized water; one end of the first filtering pipeline is connected with the liquid outlet end of the static mixer, the other end of the first filtering pipeline is connected with a spray gun assembly, and the first filtering pipeline is used for filtering the diluted urea solution in the static mixer.

Description

Technical Field

[0001] The present application relates to the technical field of fluid injection equipment, and in particular to a urea solution delivery pipeline structure and a denitration system. Background Art

[0002] In the denitration process of circulating fluidized bed boilers, urea is used as a common denitrification agent, which chemically reacts with NOx in flue gas through urea solution to achieve the purpose of reducing nitrogen oxide emissions. However, in the preparation and transportation of urea solution, some small debris will inevitably be produced. These debris enter the urea spray gun along with the urea solution, posing a potential threat to the normal operation of the spray gun.

[0003] These tiny debris are usually fragments of urea packaging bags. Specifically, they are manually added into the urea dissolving tank, and the bags need to be manually unpacked. In the process of unpacking the bags, it is inevitable that the tiny plastic skin, sealing lines and other materials on the urea packaging bags will be brought into the dissolving tank. This process may produce tiny debris due to improper operation, impure raw materials or equipment wear. These tiny debris will inevitably enter the urea spray gun with the urea solution. If things go on like this for a long time, it will cause the urea spray gun to be blocked.

[0004] A clogged urea spray gun will cause uneven urea solution spraying, which will affect the denitration efficiency. More seriously, long-term blockage will accelerate the wear and corrosion of the spray gun, shorten its service life, and increase maintenance and replacement costs. In addition, since the spray gun is located at a high position, when the spray gun is clogged, the workload and cycle of cleaning the spray gun are large, which increases the difficulty of maintaining the denitration system.

[0005] Therefore, there is an urgent need for a urea solution delivery pipeline structure to solve the above technical problems. Summary of the invention

[0006] In order to solve the above technical problems, the present application provides a urea solution delivery pipeline structure and a denitrification system, which can reduce fine debris in the urea solution and thus reduce the clogging of the spray gun.

[0007] The first aspect of the present application provides a urea solution delivery pipeline structure, comprising:

[0008] Urea solution pipeline, desalted water pipeline, first filter pipeline and static mixer;

[0009] The urea solution pipeline and the desalted water pipeline are respectively connected to the liquid inlet end of the static mixer, and the static mixer is used to mix the urea solution and the desalted water;

[0010] One end of the first filter pipeline is connected to the liquid outlet end of the static mixer, and the other end is connected to the spray gun assembly. The first filter pipeline is used to filter the diluted urea solution in the static mixer.

[0011] Optionally, the urea solution delivery pipeline structure also includes a second filter pipeline, which is arranged in parallel with the first filter pipeline, and the two ends of the first filter pipeline are respectively connected to the liquid outlet and the spray gun assembly, and one of the first filter pipeline and the second filter pipeline is kept in an open state.

[0012] Optionally, one or both of the first filter pipeline and the second filter pipeline adopt the following structure:

[0013] The structure includes: a filter assembly and two first ball valves, wherein the filter assembly is detachably arranged between the two first ball valves, one end of the filter assembly is connected to the static mixer through one of the first ball valves, and the other end of the filter assembly is connected to the spray gun assembly through another first ball valve, and the filter assembly is used to filter the diluted urea solution in the static mixer.

[0014] Optionally, the urea pipeline structure further includes a reverse cleaning pipeline, both ends of which are connected to both ends of the filter assembly via three-way pipe fittings, respectively, and the reverse cleaning pipeline is used to clean the filter assembly in the filter pipeline in a closed state.

[0015] Optionally, the reverse cleaning pipeline includes: a cleaning tank, a cleaning pump and a first filter screen, the cleaning tank is provided with a cleaning outlet pipe and a cleaning inlet pipe, the cleaning inlet pipe is connected to one end of the filter screen assembly close to the spray gun assembly, and the cleaning outlet pipe is connected to one end of the filter screen assembly close to the static mixer;

[0016] The first filter screen is arranged in the cleaning outlet pipe, the cleaning pump is arranged in the cleaning inlet pipe, and the cleaning pump is used to control the cleaning water in the cleaning tank to flush the filter screen assembly.

[0017] Optionally, the filter assembly includes: a tube body and a second filter, flange surfaces are respectively provided at both ends of the tube body, the tube body is respectively connected to the two first ball valves through the flange surfaces, the second filter is respectively provided at both ends of the tube body, and the second filter is connected to the tube body by bolts.

[0018] Optionally, flow meters are provided at both ends of the filter assembly, and the flow meters are used to respectively measure the flow velocity at both ends of the filter assembly.

[0019] Optionally, a first electric regulating valve and a second ball valve are provided between the first filter pipeline and the spray gun assembly.

[0020] Optionally, the spray gun assembly includes a compressed air storage tank and a plurality of spray guns, the plurality of spray guns are respectively connected to the compressed air storage tank and the filter pipeline, and the compressed air storage tank is used to provide compressed air to the plurality of spray guns.

[0021] A second aspect of the present application provides a denitration system, comprising a urea solution storage tank, a desalted water storage tank, a spray gun assembly, and the urea solution delivery pipeline structure in the first aspect and any optional manner of the first aspect;

[0022] The urea solution storage tank is connected to the urea solution pipeline in the urea solution delivery pipeline structure, the desalted water storage tank is connected to the desalted water pipeline in the urea solution delivery pipeline structure, and the spray gun assembly is connected to the first filter pipeline in the urea solution delivery pipeline structure.

[0023] It can be seen from the above technical solutions that this application has the following effects:

[0024] By connecting the urea solution pipeline and the desalted water pipeline together at the liquid inlet end of the static mixer, the urea solution and the desalted water are mixed through the static mixer, that is, the liquid outlet end of the static mixer is connected to the first filter pipeline, the first filter pipeline is also connected to the spray gun assembly, and the diluted urea solution in the static mixer is filtered through the first filter pipeline, and then sprayed through the spray gun assembly after filtration. In this way, by adding the first filter pipeline, the fine debris contained in the urea solution is filtered and removed, and the clogging of the spray gun assembly by the urea solution is reduced, thereby extending the service life of the spray gun assembly and reducing the cost of maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution in the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic diagram of a urea solution delivery pipeline structure provided in the present application;

[0027] Figure 2 A schematic diagram of a filter assembly in a urea solution delivery pipeline structure provided in the present application;

[0028] Figure 3A schematic diagram of a reverse cleaning pipeline in a urea solution delivery pipeline structure provided in the present application;

[0029] Figure 4 A partial enlarged schematic diagram of a urea solution delivery pipeline structure provided in this application

[0030] Figure 5 A schematic diagram of a denitrification system provided in this application;

[0031] Among them, urea solution pipeline 01, desalted water pipeline 02, first filter pipeline 03, static mixer 04, spray gun assembly 05, second filter pipeline 06, filter assembly 07, first ball valve 08, reverse cleaning pipeline 09, three-way pipe fitting 10, cleaning tank 11, cleaning pump 12, first filter screen 13, cleaning outlet pipe 14, cleaning inlet pipe 15, pipe body 16, second filter screen 17, flange surface 18, flow meter 19, first electric regulating valve 20, second ball valve 21, compressed air storage tank 22, spray gun 23, urea solution storage tank 24, desalted water storage tank 25, second electric regulating valve 26, third ball valve 27, flow meter 28. DETAILED DESCRIPTION

[0032] In the present invention, the directions or positional relationships indicated by terms such as “upper”, “lower”, “left”, “right”, “front”, “back”, “top”, “bottom”, “inside”, “outside”, “middle”, “vertical”, “horizontal”, “lateral” and “longitudinal” are based on the directions or positional relationships shown in the accompanying drawings, and are only used to illustrate the relative positional relationships between the various components or components, and do not particularly limit the specific installation directions of the various components or components.

[0033] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0034] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0035] In addition, the structures, proportions, sizes, etc. drawn in the drawings in the present application are only used to match the contents disclosed in the specification for the technical personnel in this field to understand and read, and are not used to limit the restrictive conditions under which the present application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in the present application without affecting the effects and purposes that can be achieved by the present application.

[0036] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] The present application provides a urea solution delivery pipeline structure and a denitrification system, which are used to reduce fine debris in the urea solution, thereby reducing the clogging of the spray gun. The specific implementation process of the present application is described as follows.

[0038] See also Figures 1 to 4 A urea solution delivery pipeline structure provided in the first aspect of the present application includes: a urea solution pipeline 01, a desalted water pipeline 02, a first filter pipeline 03 and a static mixer 04; the urea solution pipeline 01 and the desalted water pipeline 02 are respectively connected to the liquid inlet end of the static mixer 04, and the static mixer 04 is used to mix the urea solution with the desalted water; one end of the first filter pipeline 03 is connected to the liquid outlet end of the static mixer 04, and the other end is connected to the spray gun 23 component 05, and the first filter pipeline 03 is used to filter the diluted urea solution in the static mixer 04.

[0039] The urea solution pipeline 01 is used to transport urea solution, which is a commonly used reagent in the denitration process. The urea solution pipeline 01 is connected to the urea solution storage tank 24 , and the urea solution is provided by the urea solution storage tank 24 .

[0040] The desalted water pipeline 02 is used to transport desalted water. Desalted water is water from which most minerals and ions have been removed. The function of the desalted water is to dilute the urea solution to achieve a specific concentration requirement. The desalted water is provided by the desalted water storage tank 25 .

[0041] The static mixer 04 is used to mix the urea solution and the desalted water. During the mixing process, the urea solution is diluted to a desired concentration for subsequent use.

[0042] One end of the first filter pipeline 03 is connected to the liquid outlet end of the static mixer 04, and the other end is connected to the spray gun 23 assembly 05. The first filter pipeline 03 is mainly used to filter the diluted urea solution in the static mixer 04 to remove the existing fine debris or particulate matter, ensure the purity of the urea solution and avoid clogging of the spray gun 23 assembly 05 caused by fine debris.

[0043] The spray gun 23 component 05 serves as the final output part, and is used to atomize the filtered urea solution into fine droplets and spray them into the reaction zone to fully contact and react with nitrogen oxides NOx (nitrogen oxides include various compounds, such as nitrous oxide (N2O), nitric oxide (NO), nitrogen dioxide (NO2), nitrogen trioxide (N2O3), nitrogen tetroxide (N2O4) and nitrogen pentoxide (N2O5)), thereby achieving the purpose of denitrification.

[0044] In an optional embodiment, the urea solution delivery pipeline structure provided in the first aspect of the present application also includes a second filter pipeline 06, the second filter pipeline 06 is arranged in parallel with the first filter pipeline 03, the two ends of the first filter pipeline 03 are respectively connected to the liquid outlet of the static mixer 04 and the spray gun 23 component 05, and one of the first filter pipeline 03 and the second filter pipeline 06 is kept in an open state. In this embodiment, the two filter pipelines are designed in parallel, which can filter the diluted urea solution flowing out of the static mixer 04 to remove possible impurities, particulate matter, etc., to ensure that the urea solution finally delivered to the spray gun 23 component 05 is pure and free of impurities. By keeping one filter pipeline open and the other in standby, the filter element / filter screen in the filter pipeline can be replaced without stopping the machine, so as to improve the continuous operation capability and maintenance convenience of the denitration system.

[0045] In actual use, when the filter element / filter screen on a filter pipeline needs to be replaced due to blockage or damage, it can be quickly switched to another spare pipeline without interrupting the entire urea solution delivery process, thus ensuring the continuity and stability of the denitrification system.

[0046] Secondly, the parallel design makes filter element / filter screen replacement easier and faster, reducing maintenance difficulty and cost.

[0047] In addition, the opening status of the two filter lines can be flexibly adjusted according to actual needs to meet the filtering requirements under different working conditions. For example, when the urea solution contains a lot of impurities, the number of filter lines opened can be increased to enhance the filtering effect.

[0048] In this optional embodiment, one or all of the first filter pipeline 03 or the second filter pipeline 06 adopts the following structure, which includes: a filter assembly 07 and two first ball valves 08, the filter assembly 07 is detachably arranged between the two first ball valves 08, one end of the filter assembly 07 is connected to the static mixer 04 through a first ball valve 08, and the other end of the filter assembly 07 is connected to the spray gun 23 assembly 05 through another first ball valve 08, and the filter assembly 07 is used to filter the diluted urea solution in the static mixer 04.

[0049] In this embodiment, the filter assembly 07 is detachable, so in the filter pipeline in a closed state, the filter assembly 07 can be directly taken out, cleaned or replaced. This design greatly improves the maintenance efficiency and flexibility of the system.

[0050] The first ball valve 08 is designed to be manually or automatically operated, so that the operator can open or close it as needed. In the parallel filtration pipeline, by switching the states of the two first ball valves 08, the filter assembly 07 can be replaced without stopping the machine. When the first ball valve 08 is in the open state, the ball valve has a large flow area and low resistance, which is conducive to maintaining the smooth flow of urea solution.

[0051] Please continue reading Figure 3 In an optional embodiment, the urea solution delivery pipeline structure provided by the present application further includes a reverse cleaning pipeline 09, the two ends of which are respectively connected to the two ends of the filter assembly 07 through a three-way pipe fitting 10, and the reverse cleaning pipeline 09 is used to clean the filter assembly 07 in the filter pipeline in a closed state. The filter assembly 07 is connected to the first ball valve 08 through the three-way pipe fitting 10, and the remaining interface of the three-way pipe fitting 10 is connected to the reverse cleaning pipeline 09, so that a cleaning channel is formed between the reverse cleaning pipeline 09 and the filter assembly.

[0052] In this embodiment, by adding a reverse cleaning pipeline 09, the filter assembly 07 in the closed filter pipeline can be cleaned without interrupting the delivery of urea solution. By reverse flushing, impurities and particulate matter accumulated on the filter assembly 07 can be effectively removed, its filtering performance can be restored, and its service life can be extended.

[0053] When there are a lot of debris on the filter assembly in a certain filter pipe and the filter pipe is in a closed state, it means that the first ball valve 08 at both ends of the filter assembly is in a closed state. At this time, the valve on the reverse cleaning pipeline 09 is opened to connect the cleaning channel, and the cleaning water (such as pure water or special cleaning agent) is introduced into the filtered component through the reverse cleaning pipeline 09. The flow direction of the cleaning water is opposite to the flow direction of the urea solution. Therefore, the cleaning water flushes the filter assembly 07 during the reverse flow process, and washes off the impurities and particulate matter attached to the filter.

[0054] In this optional embodiment, the reverse cleaning pipeline 09 includes: a cleaning tank 11, a cleaning pump 12 and a first filter 13. The cleaning tank 11 is provided with a cleaning outlet pipe 14 and a cleaning inlet pipe 15. The cleaning inlet pipe 15 is connected to one end of the filter assembly 07 close to the spray gun 23 assembly 05, and the cleaning outlet pipe 14 is connected to one end of the filter assembly 07 close to the static mixer 04; the first filter 13 is arranged in the cleaning outlet pipe 14, and the cleaning pump 12 is arranged in the cleaning inlet pipe 15. The cleaning pump 12 is used to control the cleaning water in the cleaning tank 11 to flush the filter assembly 07.

[0055] The cleaning tank 11 is used as a container for storing cleaning water and is used to provide the cleaning water required in the reverse cleaning process. The cleaning tank 11 is provided with a cleaning outlet pipe 14 and a cleaning inlet pipe 15. The two pipes are respectively used to connect the two ends of the filter assembly 07 to ensure that the cleaning water can flow between the cleaning tank 11 and the filter assembly 07.

[0056] The cleaning pump 12 is arranged in the cleaning inlet pipe 15, and is responsible for generating sufficient pressure and water flow so as to flush the filter assembly 07 with cleaning water, thereby removing impurities and particulate matter attached to the filter. The cleaning pump 12 can be operated by a manual or automatic control system. In the automatic control system, the cleaning pump 12 can be automatically started according to a preset cleaning cycle or a monitored filter blockage degree.

[0057] The first filter screen 13 is arranged in the cleaning outlet pipe 14, which helps to further filter the impurities and particles washed down from the filter screen assembly 07, and prevent these impurities and particles from entering the cleaning tank 11. The first filter screen 13 is detachably connected to the cleaning outlet pipe 14. When the reverse cleaning pipeline 09 is in an inactive state, the first filter screen 13 can be disassembled for cleaning to ensure the filtering effect of the first filter screen 13.

[0058] In an optional embodiment, the filter assembly 07 includes a tube body 16 and a second filter 17. The two ends of the tube body 16 are respectively provided with flange surfaces 18. The tube body 16 is connected to two first ball valves 08 through the flange surfaces 18. The second filter 17 is respectively provided at the two ends of the tube body 16. The second filter 17 is connected to the tube body 16 through bolts. Specifically, two second filter screens 17 are provided in the tube body 16. The two second filter screens 17 are respectively located at the two ends of the tube body 16. The flange surfaces 18 on the tube body 16 are also connected to the two first ball valves 08 through bolts. A sealing gasket is provided at the connection to prevent leakage of urea solution. When cleaning the second filter 17, the filter assembly 07 is first disassembled, and then the bolts on the second filter 17 are disassembled to achieve the disassembly of the second filter 17.

[0059] When the reverse cleaning pipeline 09 is used, the impurities between the two second filter screens 17 can also be cleaned and removed by manually disassembling the filter screen assembly 07 .

[0060] In an optional embodiment, flowmeters 19 are provided at both ends of the filter assembly 07, and the flowmeters 19 are used to measure the flow velocity at both ends of the filter assembly 07 respectively. When the filter assembly 07 is normally unblocked, the flow velocity at both ends of the filter assembly 07 is maintained within a certain range. When the filter assembly 07 is blocked by fine debris (indicating that the fine debris in the urea solution is filtered), the flow velocity at both ends of the filter assembly 07 changes. Therefore, in this embodiment, the blockage degree of the filter assembly 07 can be determined by real-time monitoring of the flow velocity at both ends, and whether the cleaning condition is met can be determined from the blockage degree. When the cleaning condition is met, another filter pipeline is replaced to transport the urea solution, and then the blocked filter assembly 07 is cleaned.

[0061] In an optional embodiment, a first electric regulating valve 20 and a second ball valve 21 are provided between the first filter pipeline 03 and the spray gun 23 assembly 05, and the first electric regulating valve 20 is used to adjust the flow rate of the urea solution passing through. The first electric regulating valve 20 can be controlled by an automatic control system, and the automatic control system sends a control signal to the first electric regulating valve 20, so that the first electric regulating valve 20 can accurately adjust the degree of opening according to the control signal, thereby controlling the flow rate of the urea solution. The second ball valve 21 is used to control the on-off of the pipeline and is used as an emergency shut-off valve or maintenance valve. Under normal circumstances, the second ball valve 21 remains open, allowing the urea solution to flow smoothly to the spray gun 23 assembly 05. However, when emergency shutdown, maintenance or cleaning of the filter assembly 07 is required, the second ball valve 21 can be quickly closed to cut off the flow of the urea solution.

[0062] In an optional embodiment, the spray gun 23 assembly 05 includes a compressed air tank 22 and a plurality of spray guns 23 , the plurality of spray guns 23 are respectively connected to the compressed air tank 22 and a filter pipeline, and the compressed air tank 22 is used to provide compressed air to the plurality of spray guns 23 .

[0063] The compressed air storage tank 22 is one of the core components of the spray gun 23 assembly 05, responsible for storing and stably providing compressed air to a number of spray guns 23. The compressed air storage tank 22 is usually equipped with an air inlet, an air outlet, and necessary accessories such as a safety valve and a pressure gauge to ensure the safe operation and effective monitoring of the storage tank. The compressed air storage tank 22 is connected to a number of spray guns 23 through pipelines to provide a continuous supply of compressed air to the spray guns 23.

[0064] Each spray gun 23 has the ability to spray the urea solution in a mist form to the target position. By receiving the urea solution from the filter pipeline and the compressed air from the compressed air storage tank 22, the urea solution is atomized and sprayed out using the principle of gas-liquid mixing.

[0065] In addition, a third ball valve 27 and a second electric regulating valve 26 are provided on the urea solution pipeline 01 or the deionized water pipeline 02, and their functions are the same as those of the second ball valve 21 and the first electric regulating valve 20, which will not be described in detail here. A flow meter 28 is also provided on the two pipelines to monitor the flow on the pipelines in real time.

[0066] See also Figure 5 The second aspect of the present application provides a denitration system comprising:

[0067] It includes a urea solution storage tank 24, a desalted water storage tank 25, a spray gun 23 assembly 05, and a urea solution delivery pipeline structure of any one of the first aspect and the first aspect's optional embodiments; the urea solution storage tank 24 is connected to the urea solution pipeline 01 in the urea solution delivery pipeline structure, the desalted water storage tank 25 is connected to the desalted water pipeline 02 in the urea solution delivery pipeline structure, and the spray gun 23 assembly 05 is connected to the first filter pipeline 03 in the urea solution delivery pipeline structure.

[0068] The urea solution storage tank 24 provides urea solution to the urea solution pipeline 01, and the desalted water storage tank 25 provides desalted water to the desalted water pipeline 02. The ball valve and the electric regulating valve cooperate to form a suitable ratio and enter the static mixer 04 for mixing and dilution. The formed diluted urea solution flows through the first filter pipeline 03 or the second filter pipeline 06 for filtration to remove fine impurities in the urea solution. After the impurities are removed, the urea solution enters the spray gun 23 component 05 for injection.

[0069] In the present denitration system, by adding a first filter pipeline 03 and a second filter pipeline 06 to the urea solution delivery pipeline structure, it is possible to ensure that fine debris in the urea solution is filtered, thereby preventing the fine debris from clogging the spray gun 23; in addition, a first electric regulating valve 20 is added between the filter pipeline and the spray gun 23. Since the first electric regulating valve 20 has a high adjustment accuracy, it is possible to achieve the purpose of reducing the operating workload of the operating personnel and reducing the urea consumption and the ammonia escape amount.

[0070] It should be noted that the above description of the disclosed embodiments enables professionals and technicians in the field to implement or use the present application. Various modifications to these embodiments will be apparent to professionals and technicians in the field, and the general principles defined herein can be implemented in other embodiments without departing from the scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A urea solution delivery pipeline structure, characterized in that: include: Urea solution pipeline, desalted water pipeline, first filter pipeline and static mixer; The urea solution pipeline and the desalted water pipeline are respectively connected to the liquid inlet end of the static mixer, and the static mixer is used to mix the urea solution and the desalted water; One end of the first filter pipeline is connected to the liquid outlet end of the static mixer, and the other end is connected to the spray gun assembly. The first filter pipeline is used to filter the diluted urea solution in the static mixer.

2. The urea solution delivery pipeline structure according to claim 1, characterized in that: The urea solution delivery pipeline structure also includes a second filter pipeline, which is arranged in parallel with the first filter pipeline. The two ends of the first filter pipeline are respectively connected to the liquid outlet and the spray gun assembly. One of the first filter pipeline and the second filter pipeline is kept in an open state.

3. The urea solution delivery pipeline structure according to claim 2, characterized in that: One or both of the first filter pipeline and the second filter pipeline adopt the following structure: The structure includes: a filter assembly and two first ball valves, wherein the filter assembly is detachably arranged between the two first ball valves, one end of the filter assembly is connected to the static mixer through one of the first ball valves, and the other end of the filter assembly is connected to the spray gun assembly through another first ball valve, and the filter assembly is used to filter the diluted urea solution in the static mixer.

4. The urea solution delivery pipeline structure according to claim 3, characterized in that: The urea pipeline structure also includes a reverse cleaning pipeline, the two ends of which are respectively connected to the two ends of the filter assembly through three-way pipe fittings, and the reverse cleaning pipeline is used to clean the filter assembly in the filter pipeline in a closed state.

5. The urea solution delivery pipeline structure according to claim 4, characterized in that: The reverse cleaning pipeline comprises: a cleaning tank, a cleaning pump and a first filter screen, the cleaning tank is provided with a cleaning outlet pipe and a cleaning inlet pipe, the cleaning inlet pipe is connected to one end of the filter screen assembly close to the spray gun assembly, and the cleaning outlet pipe is connected to one end of the filter screen assembly close to the static mixer; The first filter screen is arranged in the cleaning outlet pipe, the cleaning pump is arranged in the cleaning inlet pipe, and the cleaning pump is used to control the cleaning water in the cleaning tank to flush the filter screen assembly.

6. The urea solution delivery pipeline structure according to any one of claims 3 to 5, characterized in that: The filter assembly includes: a tube body and a second filter. Flange surfaces are respectively provided at both ends of the tube body. The tube body is connected to the two first ball valves through the flange surfaces. The second filter is respectively provided at both ends of the tube body. The second filter is connected to the tube body through bolts.

7. The urea solution delivery pipeline structure according to any one of claims 3 to 5, characterized in that: Flowmeters are provided at both ends of the filter assembly, and the flowmeters are used to measure the flow velocities at both ends of the filter assembly respectively.

8. The urea solution delivery pipeline structure according to claim 1, characterized in that: A first electric regulating valve and a second ball valve are arranged between the first filtering pipeline and the spray gun assembly.

9. The urea solution delivery pipeline structure according to any one of claims 1 to 5, characterized in that: The spray gun assembly includes a compressed air storage tank and a plurality of spray guns. The plurality of spray guns are respectively connected to the compressed air storage tank and the filter pipeline. The compressed air storage tank is used to provide compressed air to the plurality of spray guns.

10. A denitration system, characterized in that: It comprises a urea solution storage tank, a desalted water storage tank, a spray gun assembly and a urea solution delivery pipeline structure according to any one of claims 1 to 9; The urea solution storage tank is connected to the urea solution pipeline in the urea solution delivery pipeline structure, the desalted water storage tank is connected to the desalted water pipeline in the urea solution delivery pipeline structure, and the spray gun assembly is connected to the first filter pipeline in the urea solution delivery pipeline structure.

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