Adenitrification system ammonia pipeline purging device

Abstract

The present invention relates to the technical field of pipeline cleaning equipment, and discloses a denitration system ammonia pipeline purging device, comprising: a pipe body structure, an embedded component, and a power device; an inner concave installation groove is provided outside the pipe body structure, and a first gas passage is provided on the side wall of the installation groove; the embedded component is fitted and fixed in the installation groove, and is provided with a first air source passage corresponding to the first gas passage; the air supply pipeline of the power device is connected to the first air source passage of the embedded component. Using compressed air instead of high-temperature steam to purge the ammonia pipeline can not only protect the ammonia pipeline valve and reduce the erosion of the valve by high-temperature steam, but also utilize the principle of compressed air flow oscillation to clean the ammonia pipeline when it is blocked, realizing the safe operation of the ammonia pipeline; it has the functions of purging and brushing, improving the cleaning power, and further ensuring the cleaning effect; by setting an inspection system, the cleaning effect in the pipeline to be tested can be inspected, and it can be judged whether the crystalline impurities in the pipeline are completely removed, further confirming the cleaning effect.

Description

Technical Field

[0001] The present invention belongs to the field of pipeline cleaning equipment, and particularly relates to a purging device for ammonia pipelines in a denitration system. Background Art

[0002] When a thermal power plant generates electricity, a large amount of sulfur and nitrate-containing waste gas will be produced in the burning coal. Discharging these waste gases into the atmosphere will cause pollution and form acid rain. To reduce nitrogen oxide emissions and improve the environmental protection quality of the power plant, the desulfurization and denitration system of the thermal power plant is a device used to treat these waste gases containing a large amount of sulfur and nitrate.

[0003] In today's world, countries are increasingly investing in air environmental protection, and the control of flue gas emission indicators from coal-fired boilers is becoming more and more strict. In addition to the traditional control of SO2 emissions, newly built thermal power plants in China must also carry out denitration treatment on flue gas. At present, the mainstream denitration technology, selective catalytic reduction of flue gas denitration method, requires ammonia as the main raw material, and the application of ammonia neutralization technology in the denitration system has become the choice of many power plants. However, ammonia is prone to crystallization at low pipeline temperatures. Many power plants use high-temperature steam purging after the unit starts up and before it shuts down to address this problem. However, due to inappropriate purging steam temperature, it is easy to damage the pipeline valves, and the condensed water after steam condensation is not conducive to the safe operation of the ammonia pipeline. Summary of the Invention

[0004] The purpose of the present invention is to provide a purging device for ammonia pipelines in a denitration system to solve at least one of the problems raised in the above background art.

[0005] To solve the above technical problems, the specific technical solutions of the present invention are as follows:

[0006] In some embodiments of the present application, a purging device for ammonia pipelines in a denitration system is provided, including: a pipe body structure, an embedded component, and a power device; wherein,

[0007] Pipe connectors are provided at both ends of the pipe body structure, which are connected to the pipeline to be purged. An inner concave installation groove is provided on the outside, and a gas passage one is provided on the side wall of the installation groove; the embedded component is fixedly fitted in the installation groove and is provided with a gas source passage one corresponding to the gas passage one; the gas supply pipeline of the power device is connected to the gas source passage one of the embedded component for purging the inner wall of the pipeline.

[0008] In the preferred solution of the above purging device for ammonia pipelines in a denitration system, a scraping mechanism is further included;

[0009] The installation groove is an annular groove, and the bottom of the annular groove extends along the axial direction of the pipe structure and forms a sliding groove with the inner wall of the pipe structure; the first air source channel penetrates through the corresponding wall of the sliding groove; the scraping mechanism is correspondingly arranged with the sliding groove, and the power device can blow the scraping mechanism to move reciprocally along the axial direction of the pipe structure by compressed gas.

[0010] In a preferred embodiment of the above ammonia pipeline purging device for the denitration system, the scraping mechanism includes: a scraping member, a first spring member, and a cleaning brush; wherein,

[0011] The scraping member is a circular ring structure, abuts against and is slidably connected to the sliding groove; one end of the scraping member close to the outside of the sliding groove is provided with a connecting plate, the first spring member is arranged on the corresponding end faces of the connecting plate and the sliding groove, and its two ends are respectively connected to the connecting plate and the corresponding end face of the sliding groove; the cleaning brush is in a ring structure, and its bristles are arranged on the outer side wall; a circular connecting groove is provided on the outer wall of the scraping member, the cleaning brush is sleeved in the connecting groove, and its bristles abut against the inner wall of the pipe structure to reciprocally brush the inner wall of the pipe structure.

[0012] In a preferred embodiment of the above ammonia pipeline purging device for the denitration system, two sets of scraping mechanisms are provided and are mirror-symmetrically arranged on both sides of the embedded component.

[0013] In a preferred embodiment of the above ammonia pipeline purging device for the denitration system, a limiting groove is formed on the outer wall of the scraping member, and a limiting component is arranged in the limiting groove; a second gas channel corresponding to the limiting groove is provided on the pipe wall of the pipe structure, and a second air source channel corresponding to the second gas channel is provided on the embedded component; the limiting component can be engaged with / disengaged from the second gas channel.

[0014] In a preferred embodiment of the above ammonia pipeline purging device for the denitration system, the limiting component includes: a telescopic rod member, a clamping joint, and a second spring member; wherein,

[0015] The telescopic rod member is arranged in the limiting groove; the clamping joint is connected to the moving end of the telescopic rod member; the second spring member is sleeved outside the telescopic rod member, and its two ends are respectively connected to the bottom of the limiting groove and the corresponding surface of the clamping joint; when the second spring member is not subjected to external force, the clamping joint can be inserted into the second gas channel, and when compressed gas enters the second gas channel, the second spring member can be compressed to disengage the clamping joint from the second gas channel.

[0016] In the preferred embodiment of the ammonia pipeline purging device of the above denitration system, the scraping member is provided with a gas passage three corresponding to the gas passage two, and can purge the inner wall of the pipe structure through the gas passage three; sealing ring grooves are provided on both the inner wall and the outer wall of the scraping member, and sealing rings are fitted in the sealing ring grooves.

[0017] In the preferred embodiment of the ammonia pipeline purging device of the above denitration system, it further includes a purging control system: the purging control system includes: a first switching valve, a second switching valve, a third switching valve and a controller; wherein,

[0018] The first switching valve is arranged in the gas passage one; the second switching valve is arranged in the gas passage two; the third switching valve is arranged in the gas passage three; the controller is electrically connected to the first switching valve, the second switching valve and the power device respectively; when purging operation is carried out, the controller controls the second switching valve to close, and the first switching valve and the third switching valve to open, and the compressed gas enters the pipeline structure through the gas source passage one, the gas passage one and the gas passage three for purging operation; when scraping operation is carried out, the controller first controls the second switching valve to open, and the compressed air blows towards the clamping joint through the gas source passage two and the gas passage two, so that the second spring member is compressed, the clamping joint disengages from the gas passage two, then the first switching valve is opened, the third switching valve is closed, and the compressed gas blows towards the scraping member along the gas source passage one and the gas passage one, driving the scraping member to move axially along the pipe structure, and by controlling the opening / closing of the first switching valve and the expansion and contraction of the first spring member, the reciprocating movement of the scraping member is realized.

[0019] In the preferred embodiment of the ammonia pipeline purging device of the above denitration system, it further includes an inspection system; the inspection system includes: an inspection pipe body, a fourth switching valve and an inspection target; wherein,

[0020] Pipe connectors are provided at both ends of the inspection pipe body and are connected to the pipeline to be inspected; inspection air holes are provided on the side wall of the inspection pipe body; the fourth switching valve is arranged in the inspection air holes and is electrically connected to the controller; the inspection target is detachably connected to the outside of the inspection pipe body, and its inspection area is opposite to the inspection air holes; the inspection plate is detachably connected to the inspection area of the inspection target.

[0021] In the preferred embodiment of the ammonia pipeline purging device of the above denitration system, the inspection target includes: an inspection plate frame, a first semi-circular clamp and a second semi-circular clamp; wherein,

[0022] Limit slide rails are symmetrically arranged at both ends of the inspection plate frame, and support rods are respectively connected to both ends thereof; the inspection plate can be inserted along the limit slide rails to achieve detachable connection with the inspection plate frame; a semi-circular clamp one is fixed at the bottom end of the support rod; a semi-circular clamp two is detachably connected to the semi-circular clamp one, and the semi-circular clamp one and the semi-circular clamp two are sleeved on the inspection pipe body and fixed by bolts to achieve detachable connection between the inspection plate frame and the inspection pipe body.

[0023] As can be seen from the above technical solutions, compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] Using compressed air instead of high-temperature steam to purge the ammonia pipeline can not only protect the ammonia pipeline valve and reduce the erosion of the valve by high-temperature steam, but also utilize the principle of compressed air flow oscillation to clean the ammonia pipeline when it is blocked, realizing the safe operation of the ammonia pipeline;

[0025] It has the functions of purging and brushing. When it is difficult to remove the crystals in the pipeline by purging, it can be removed by brushing; improving the cleaning power and thus ensuring the cleaning effect;

[0026] By setting up an inspection system, the cleaning effect of the pipeline to be tested can be inspected, and it can be judged whether the crystal impurities in the pipeline are completely removed, further confirming the cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0028] Figure 1 It is a three-dimensional view of an embodiment of the present invention;

[0029] Figure 2 It is a cross-sectional view of an embodiment of the present invention;

[0030] Figure 3 is Figure 2 the enlarged view of part A in

[0031] Figure 4 It is a three-dimensional view of the inspection system in an embodiment of the present invention.

[0032] In the figure:

[0033] 1. Pipe body structure; 10. Pipe connector; 11. First gas passage; 12. Second gas passage; 2. Embedded component; 20. First gas source passage; 21. Second gas source passage; 3. Scratching mechanism; 30. Scratching part; 300. Third gas passage; 31. First spring part; 32. Cleaning brush; 330. Telescopic rod part; 331. Clamping joint; 332. Second spring part; 34. Sealing ring; 35. Water and oil filter screen; 41. First switching valve; 42. Second switching valve; 43. Third switching valve; 50. Inspection pipe body; 500. Inspection air hole; 510. Inspection plate frame; 511. First semi-circular clamp; 512. Second semi-circular clamp; 513. Limit slide rail; 52. Inspection plate. Detailed implementation manners

[0034] The following combines the drawings and embodiments to further describe in detail the specific implementation manners of the present invention. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0035] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0036] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0037] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0038] In order to better understand the purpose, structure and function of the present invention, the following further describes the present invention in detail with reference to the drawings.

[0039] Refer to Figures 1-4As shown in the figure, a denitrification system ammonia pipeline purging device according to an embodiment of the present application includes: a pipe body structure 1, an embedded component 2, and a power device; wherein,

[0040] Pipeline connectors 10 are provided at both ends of the pipe body structure 1, which are connected to the pipeline to be purged. An inwardly concave mounting groove is provided on the outside, and a gas passage 11 is provided on the side wall of the mounting groove; the embedded component 2 is fitted and fixed in the mounting groove, and is provided with a gas source passage 20 corresponding to the gas passage 11; the air supply pipeline of the power device is connected to the gas source passage 20 of the embedded component 2 for purging the inner wall of the pipeline.

[0041] It should be noted that the power device is a prior art, and can preferably be a large compressor, or the large container in the device can be used to store gas for intermittent purging. The purging pressure shall not exceed the design pressure of the container and the pipeline, and the flow rate shall not be less than 20 m / s.

[0042] Specifically, the pipeline connector 10 can be a flange. The pipe body structure 1 of the present device is connected to the pipeline to be cleaned through the flange, and a detachable connection state is achieved through bolts.

[0043] In the preferred solution of the above embodiment, a scraping mechanism 3 is further included;

[0044] The mounting groove is an annular groove, and the bottom of the annular groove extends along the axial direction of the pipe body structure 1, forming a sliding groove with the inner wall of the pipe body structure 1; the gas source passage 20 penetrates the corresponding wall of the sliding groove; the scraping mechanism 3 is arranged corresponding to the sliding groove, and the power device can blow the action of the scraping mechanism 3 through compressed gas, so that it reciprocates along the axial direction of the pipe body structure 1.

[0045] In the preferred solution of the above embodiment, the scraping mechanism 3 includes: a scraping member 30, a first spring member 31, and a cleaning brush 32; wherein,

[0046] The scraping member 30 is a circular ring structure, which abuts against and is slidably connected to the sliding groove; a connecting plate is provided at one end of the scraping member 30 close to the outside of the sliding groove, and the first spring member 31 is arranged between the connecting plate and the corresponding end face of the sliding groove, and its two ends are respectively connected to the connecting plate and the corresponding end face of the sliding groove; the cleaning brush 32 is in a ring structure, and its bristles are arranged on the outer side wall; a ring-shaped connecting groove is provided on the outer wall of the scraping member 30, and the cleaning brush 32 is sleeved in the connecting groove, and its bristles abut against the inner wall of the pipe body structure 1 to reciprocally brush the inner wall of the pipe body structure 1. Through the purging and brushing functions, when the crystallization in the pipeline is difficult to remove by purging, it can be removed by brushing; the cleaning force is improved, and thus the cleaning effect is ensured.

[0047] In the preferred solution of the above embodiment, two sets of scraping mechanisms 3 are provided, which are mirror-symmetrically arranged on both sides of the embedded component 2, and can achieve two-way cleaning, improving the cleaning efficiency.

[0048] In a preferred solution of the above embodiment, a limiting groove is formed in the outer wall of the scraping member 30, and a limiting component is arranged in the limiting groove; a second gas passage 12 corresponding to the limiting groove is arranged on the pipe wall of the pipe body structure 1, and the embedded component 2 is provided with a second gas source passage 21 corresponding to the second gas passage 12; the limiting component can be engaged with / disengaged from the second gas passage 12.

[0049] In a preferred solution of the above embodiment, the limiting component includes: a telescopic rod member 330, a clamping head 331, and a second spring member 332; wherein,

[0050] The telescopic rod member 330 is arranged in the limiting groove; the clamping head 331 is connected to the acting end of the telescopic rod member 330; the second spring member 332 is sleeved outside the telescopic rod member 330, and its two ends are respectively connected to the bottom of the limiting groove and the corresponding surface of the clamping head 331; when the second spring member 332 is not subjected to external force, the clamping head 331 can be inserted into the second gas passage 12, and when compressed gas enters the second gas passage 12, the second spring member 332 can be compressed to disengage the clamping head 331 from the second gas passage 12.

[0051] In a preferred solution of the above embodiment, the scraping member 30 is provided with a third gas passage 300 corresponding to the second gas passage 12, and the inner wall of the pipe body structure 1 can be purged through the third gas passage 300; sealing ring grooves are arranged on both the inner wall and the outer wall of the scraping member 30, and sealing rings 34 are embedded in the sealing ring grooves.

[0052] Specifically, the air outlet of the third gas passage 300 is connected to a water and oil filter screen 35, which can prevent moisture and oil in the gas from eroding the pipeline.

[0053] In a preferred solution of the above embodiment, a purging control system is further included: the purging control system includes: a first switching valve 41, a second switching valve 42, a third switching valve 43, and a controller; wherein,

[0054] The on-off valve one 41 is arranged in the gas passage one 11; the on-off valve two 42 is arranged in the gas passage two 12; the on-off valve three 43 is arranged in the gas passage three 300; the controller is electrically connected to the on-off valve one 41, the on-off valve two 42 and the power equipment respectively; when a purging operation is carried out, the controller controls the on-off valve two 42 to close, and the on-off valve one 41 and the on-off valve three 43 to open, and the compressed gas enters the pipeline structure through the gas source passage one 20, the gas passage one 11 and the gas passage three 300 for purging operation; when a scraping operation is carried out, the controller first controls the on-off valve two 42 to open, and the compressed air blows towards the clamping joint 331 through the gas source passage two 21 and the gas passage two 12, so that the spring part two 332 is compressed by force, and the clamping joint 331 disengages from the gas passage two 12, then the on-off valve one 41 is opened, and the on-off valve three 43 is closed, and the compressed gas blows towards the scraping part 30 along the gas source passage one 20 and the gas passage one 11, driving the scraping part 30 to move axially along the pipe body structure 1, and the reciprocating movement of the scraping part 30 is realized by controlling the opening / closing of the on-off valve one 41 and the expansion and contraction of the spring part one 31.

[0055] In the preferred solution of the above embodiment, an inspection system is further included; the inspection system includes: an inspection pipe body 50, an on-off valve four, an inspection target and an inspection plate 52; wherein,

[0056] Pipe connectors 10 are arranged at both ends of the inspection pipe body 50 and are connected to the pipeline to be inspected; inspection air holes 500 are arranged on the side wall of the inspection pipe body 50; the on-off valve four is arranged in the inspection air holes and is electrically connected to the controller; the inspection target is detachably connected to the outside of the inspection pipe body 50, and its inspection area is opposite to the inspection air holes; the inspection plate 52 is detachably connected to the inspection area of the inspection target.

[0057] It should be noted that the on-off valve one 41, the on-off valve two 42, the on-off valve three 43 and the controller are all prior arts. Among them, the on-off valve one 41, the on-off valve two 42 and the on-off valve three 43 can be solenoid valves, and the controller can preferably be a PLC controller with programming function.

[0058] In the preferred solution of the above embodiment, the inspection target includes: an inspection plate frame 510, a semi-circular clamp one 511 and a semi-circular clamp two 512; wherein,

[0059] Limit slide rails 513 are symmetrically arranged at both ends of the inspection plate frame 510, and support rods are respectively connected to both ends thereof; the inspection plate can be inserted along the limit slide rails 513 to realize the detachable connection with the inspection plate frame 510; the semi-circular clamp one 511 is fixed at the bottom end of the support rod; the semi-circular clamp two 512 is detachably connected to the semi-circular clamp one 511, and the semi-circular clamp one 511 and the semi-circular clamp two 512 are sleeved on the inspection pipe body 50 and fixed by bolts to realize the detachable connection between the inspection plate frame 510 and the inspection pipe body 50.

[0060] Specifically, the inspection plate 52 can be a wooden plate, with its inspection surface painted white or pasted with white paper by glue. When the air flow blows from the inspection air hole 500 towards the inspection surface of the inspection plate 52, if stains appear on its surface within a certain period of time, it indicates that the pipeline cleaning is not completed. If no stains appear on its surface within a certain period of time, it means that the cleaning is completed.

[0061] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0062] Using compressed air instead of high-temperature steam to purge the ammonia pipeline can not only protect the ammonia pipeline valve and reduce the erosion of the valve by high-temperature steam, but also utilize the principle of compressed air flow oscillation to clean the ammonia pipeline when it is blocked, realizing the safe operation of the ammonia pipeline.

[0063] By setting up an inspection system, the cleaning effect inside the pipeline to be tested can be inspected, and it can be judged whether the crystalline impurities inside the pipeline are completely removed, further confirming the cleaning effect.

[0064] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0065] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A purge device for an ammonia pipeline in a denitrification system, characterized in that, Including: A pipe body structure, with pipe connectors provided at both ends, connected to the pipeline to be purged, having a concave installation groove on the outside, and a gas passage 1 provided on the side wall of the installation groove; An embedded component, fitted and fixed in the installation groove, having a gas source passage 1 corresponding to the gas passage 1; A power device, whose air supply pipeline is connected to the gas source passage 1 of the embedded component, for purging the inner wall of the pipeline; It also includes a scraping mechanism; The installation groove is an annular groove, the bottom of the annular groove extends along the axial direction of the pipe body structure, and forms a sliding groove with the inner wall of the pipe body structure; the gas source passage 1 penetrates the corresponding wall of the sliding groove; the scraping mechanism is correspondingly arranged with the sliding groove, and the power device can blow the action of the scraping mechanism through compressed gas, so that it reciprocates along the axial direction of the pipe body structure; The scraping mechanism includes: A scraping piece, the scraping piece is a circular ring structure, abuts in the sliding groove, and is slidably connected thereto; A first spring member, a connecting plate is provided at one end of the scraping piece close to the outside of the sliding groove, the first spring member is arranged on the corresponding end surface of the connecting plate and the sliding groove, and its two ends are respectively connected to the connecting plate and the corresponding end surface of the sliding groove; A cleaning brush, in a ring structure, with its bristles arranged on the outer side wall; a ring-shaped connecting groove is provided on the outer wall of the scraping piece, the cleaning brush is sleeved in the connecting groove, and its bristles abut against the inner wall of the pipe body structure to reciprocally brush the inner wall of the pipe body structure; Two sets of scraping mechanisms are provided, mirror-symmetrically arranged on both sides of the embedded component; A limiting groove is provided on the outer wall of the scraping piece, and a limiting component is arranged in the limiting groove; a gas passage 2 corresponding to the limiting groove is provided on the pipe wall of the pipe body structure, and a gas source passage 2 corresponding to the gas passage 2 is provided on the embedded component; the limiting component can be engaged with / disengaged from the gas passage 2.

2. The ammonia pipeline purging device for a denitration system according to claim 1, characterized in that, The limiting component includes: A telescopic rod member, arranged in the limiting groove; A clamping head, connected to the action end of the telescopic rod member; A second spring member, sleeved on the outside of the telescopic rod member, with its two ends respectively connected to the bottom of the limiting groove and the corresponding surface of the clamping head; when the second spring member is not subjected to external force, the clamping head can be inserted into the gas passage 2, and when compressed gas enters the gas passage 2, the second spring member can be compressed to make the clamping head disengage from the gas passage 2.

3. The ammonia pipeline purging device for a denitration system according to claim 2, characterized in that, The scraping piece is provided with a gas passage 3 corresponding to the gas passage 2, and the inner wall of the pipe body structure can be purged through the gas passage 3; sealing ring grooves are provided on both the inner wall and the outer wall of the scraping piece, and sealing rings are fitted in the sealing ring grooves.

4. The ammonia pipeline purging device of a denitration system according to claim 3, characterized in that, It also includes a purging control system: The purging control system includes: A first switch valve, arranged in the gas passage 1; A second switch valve, arranged in the gas passage 2; A third switch valve, arranged in the gas passage 3; A controller, electrically connected to the first switch valve, the second switch valve and the power device respectively; When performing a purging operation, the controller controls the second switching valve to close, and the first and third switching valves to open. Compressed gas enters the pipeline structure through the first air source channel, the first gas channel, and the third gas channel for purging; when performing a scraping operation, the controller first controls the second switching valve to open, and compressed air blows towards the clamping joint through the second air source channel and the second gas channel, causing the second spring member to be compressed, and the clamping joint to disengage from the second gas channel. Then, the first switching valve is opened, and the third switching valve is closed. Compressed gas blows towards the scraping member along the first air source channel and the first gas channel, driving the scraping member to move axially along the pipe body structure. By controlling the opening / closing of the first switching valve and the expansion / contraction of the first spring member, the reciprocating movement of the scraping member is achieved.

5. The ammonia pipeline purging device of a denitration system according to claim 4, characterized in that, It further includes an inspection system; the inspection system includes: An inspection pipe body, with pipe connectors provided at both ends thereof, which are connected to the pipeline to be inspected; inspection air holes are provided on the side wall of the inspection pipe body; A fourth switching valve, arranged at the inspection air hole and electrically connected to the controller; An inspection target, detachably connected to the outside of the inspection pipe body, and its inspection area is opposite to the inspection air hole; An inspection plate, detachably connected to the inspection area of the inspection target.

6. The ammonia pipeline purging device for a denitrification system according to claim 5, characterized in that, The inspection target includes: An inspection plate frame, with limiting slide rails symmetrically arranged at both ends thereof, and support rods respectively connected to both ends; the inspection plate can be inserted along the limiting slide rails to achieve detachable connection with the inspection plate frame; A first semi-circular clamp, fixed to the bottom end of the support rod; A second semi-circular clamp, detachably connected to the first semi-circular clamp. The first and second semi-circular clamps are sleeved on the inspection pipe body and fixed by bolts to achieve detachable connection between the inspection plate frame and the inspection pipe body.

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