In-situ installation multi-path NOX sampling probe

Abstract

The invention discloses an in-situ installation multi-path NOX sampling probe, and belongs to the field of sampling probes, the in-situ installation multi-path NOX sampling probe comprises a rainproof box, one side of the rainproof box is fixedly connected with a connecting flange, the inside of the connecting flange is fixedly connected with a fixed cylinder, the inside of the fixed cylinder is fixedly connected with a sampling probe rod, and the sampling probe rod is fixedly connected with a sampling probe. A connecting end wire box is fixedly connected to one side of the lower surface of the rainproof box, a heating box is fixedly connected to one side of the inner surface of the rainproof box, a sampling assembly is arranged on the inner surface of the heating box, and a dust blocking assembly is arranged on one side of a sampling probe rod. The through-type filter can be matched with the blowback device, the blowback direction is opposite to the gas sampling direction, regular blowback can be realized, and the through-type filter and the sampling probe rod adopt a same-diameter through connection structure, so that the optimal blowback effect is ensured, the probability of blockage of the sampling probe is effectively reduced, and the workload of daily maintenance is greatly reduced.

Description

Technical Field

[0001] The invention relates to the field of sampling probes, and more particularly to an in-situ installed multi-channel NOX sampling probe. Background Art

[0002] Nitrogen oxides (NOX) refers to the general term for nitrogen oxides, mainly including nitric oxide (NO) and nitrogen dioxide (NO2). They are one of the air pollutants and pose a serious threat to the environment and human health. NOX emissions usually come from the combustion process, such as thermal power plants, automobile emissions, industrial combustion, etc. Effective monitoring and control of NOX emissions is not only a requirement for environmental protection, but also a requirement to meet increasingly stringent emission standards. For this reason, it is particularly important to develop an efficient and accurate NOX sampling probe

[0003] Existing NOX sampling probes usually have the problem of easy clogging of the sampling head. Especially in the process of ammonia injection optimization control, the accuracy and real-time performance of NOX concentration measurement are crucial; however, the conventional filter is located at the probe head, which is easy to cause clogging in a high particulate matter environment, resulting in reduced sampling efficiency and the inability to guarantee the accuracy and real-time performance of NOX concentration measurement, affecting the control accuracy and reliability of the system. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide an in-situ installed multi-channel NOX sampling probe.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] An in-situ installed multi-channel NOx sampling probe comprises a rainproof box, one side of the rainproof box is fixedly connected to a connecting flange, the interior of the connecting flange is fixedly connected to a fixing cylinder, the interior of the fixing cylinder is fixedly connected to a sampling probe rod, one side of the lower surface of the rainproof box is fixedly connected to a connecting end box, one side of the inner surface of the rainproof box is fixedly connected to a heating box, the inner surface of the heating box is provided with a sampling assembly, and one side of the sampling probe rod is provided with a dust shield assembly.

[0007] The sampling assembly includes a mounting flange fixed to one side of the inner surface of the heating box, an integrated heating device is fixedly connected to one side of the mounting flange, a sampling cavity is opened inside the integrated heating device, a through-type filter is arranged on the inner surface of the sampling cavity, the through-type filter and the sampling probe adopt a same-diameter through-connection structure, a mounting plate is arranged on one side of the integrated heating device, a NOx sensor is fixedly connected to one side of the mounting plate, the NOx sensor is located inside the temperature detection element, a sampling connector is threadedly connected to one side of the mounting plate, a sampling tube is inserted into one side of the sampling connector.

[0008] Furthermore, the number of the sampling probe rods is three, and the sampling depths of each sampling probe rod are different. The sampling probe rods correspond to the sampling cavity and one end of each sampling probe rod extends into the interior of the sampling cavity. The through filter is made of a combination of composite modified polytetrafluoroethylene and sintered metal material. The through filter effectively filters particulate matter in the flue gas. The sampling probe rods are made of heat-resistant and erosion-resistant materials. The other end of the sampling tube is provided with a three-way valve, and the other end of the three-way valve is connected to a sampling pump. An air blowing assembly is arranged on the outer surface of the integrated heating device.

[0009] Furthermore, the air blowing assembly includes three connecting nozzles connected by threads and an air inlet cavity opened at the inner edge of the integrated heating device. An air inlet channel is opened on the inner surface of the air inlet cavity. A connecting valve is threadedly connected to the outer surface of the connecting nozzle. A back blowing pipe is inserted into the top of the connecting valve. One ends of the three back blowing pipes are fixedly connected to an air inlet heating assembly, and an air path connecting end is communicated with the outer surface of the air inlet heating assembly.

[0010] Furthermore, the air inlet channel extends into the interior of the sampling cavity, the top of the connecting nozzle extends into the interior of the air inlet cavity, the bottom of the connecting valve is connected to an ammonia removal pipe, the ammonia removal pipe is connected to an ammonia removal agent device, and the air path connecting end is connected to an external high-pressure gas source.

[0011] Furthermore, a wire threading hole is opened at the inner top of the connection terminal box, and the connection terminal box is interconnected with the interior of the rainproof box through the wire threading hole. The temperature detection element is connected to the control system.

[0012] Furthermore, the sampling cavity, the air inlet channel and the air inlet cavity in the integrated heating device form a flowing cavity, which increases the contact area between the sampling gas and the ammonia removal agent, thereby improving the ammonia removal efficiency and further enhancing the sampling accuracy and efficiency. The integrated heating device is convenient for disassembly and assembly, facilitating the replacement of reagents or selection and matching. A throttling device is arranged at the other end of the sampling pump.

[0013] Furthermore, the ash blocking assembly includes a hinge seat fixed at one end of the outer surface of the sampling probe rod, a telescopic rod slidably connected to the middle of the interior of the fixed cylinder, and a side through groove opened on the inner surface of the fixed cylinder. A pull rod is fixedly connected to one side of the outer surface of the telescopic rod. Three groups of racks are fixedly connected to the side of the outer surface of the telescopic rod far away from the pull rod. A U-shaped plate is hinged inside the hinge seat through a hinge shaft. A shielding plate is fixedly connected to one side of the U-shaped plate. A gear is fixedly connected to the interior of the U-shaped plate through a hinge shaft.

[0014] Further, the rack and the gear mesh with each other. One side of the pull rod penetrates into the through groove and slides therein. The U-shaped plate is fixedly connected to the hinge shaft, and the hinge seat is rotatably connected to the hinge shaft. A limiting component is fixedly connected to the outer surface of the fixed cylinder.

[0015] Further, the limiting component includes two fixing plates fixed on the outer surface of the fixed cylinder. A spring is fixedly connected to the inner top of the fixing plate, and a stop rod is fixedly connected to the bottom of the spring.

[0016] Further, the stop rod is located inside the fixing plate, and the stop rod is slidably adapted to the fixing plate. Limiting plates are arranged on both sides of the stop rod, and the stop rod is located above the through groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. This solution adopts a through-type filter in cooperation with a backflush device. The backflush direction is opposite to the gas sampling direction and can be backflushed regularly. The through-type filter and the sampling probe adopt a same-diameter through-connection structure, and there is no obstruction in the purge pipeline to ensure the best backflush effect, effectively reducing the probability of blockage of the sampling probe, greatly reducing the workload of daily maintenance. At the same time, by integrating three independent NOX sampling units, each unit having a different sampling length, multi-point sampling at different depths is realized, and more comprehensive NOX concentration data is obtained. This design enables the sampling probe to provide more accurate ammonia injection control information, significantly improving the efficiency and reliability of ammonia injection optimization.

[0019] 2. Through the automatic linkage of the temperature detection element and the pressure detection sensor built in the temperature detection element with the backflush device, when the detected temperature exceeds a predetermined threshold or the gas resistance in the pipeline reaches a predetermined threshold, a judgment on the purge control of the pipeline and the through-type filter is made, and the backflush device is automatically started to ensure the stable operation of the system, further improving the reliability of the sampling probe, making it suitable for industrial occasions such as ammonia injection optimization control that require continuous on-line monitoring. This multi-channel integrated design not only reduces the maintenance workload, but also enables the ammonia injection system to make more accurate adjustments according to the multi-point sampling data, thereby realizing the effective control of NOX concentration. The whole process is heated at a constant temperature to 200 degrees Celsius and above to avoid low-temperature crystallization of sulfur and ammonia. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is the structural schematic diagram of the present invention Figure 1 ;

[0021] Figure 2 is the structural schematic diagram of the present invention Figure 2 ;

[0022] Figure 3Schematic diagram of the internal structure of the rainproof box of the present invention;

[0023] Figure 4 Schematic diagram of the structure of the sampling component of the present invention;

[0024] Figure 5 Schematic cross-sectional view of the integrated heating device of the present invention Figure 1 ;

[0025] Figure 6 Schematic cross-sectional view of the integrated heating device of the present invention Figure 2 ;

[0026] Figure 7 Schematic diagram of the structure of the dust blocking component of the present invention Figure 1 ;

[0027] Figure 8 Schematic diagram of the structure of the dust blocking component of the present invention Figure 2 ;

[0028] Fig. 9 Schematic diagram of the structure of the limit component of the present invention.

[0029] Explanation of the reference numerals in the figure:

[0030] 1. Rainproof box; 2. Connecting flange; 3. Fixed cylinder;

[0031] 4. Sampling component; 41. Integrated heating device;

[0032] 42. Backflush component; 421. Connecting valve; 422. Backflush pipe; 423. Intake heating component; 424. Gas path connection end; 425. Connecting nozzle; 426. Intake channel; 427. Intake cavity;

[0033] 43. Mounting plate; 44. Sampling pipe; 45. Three-way valve; 46. Sampling pump; 47. NOX sensor; 48. Mounting flange; 49. Through filter; 410. Sampling connector; 411. Sampling cavity; 412. Temperature detection element;

[0034] 5. Connection terminal box; 6. Heating box; 7. Sampling probe;

[0035] 8. Dust blocking component; 81. Telescopic rod; 82. C-shaped plate; 83. Shielding plate; 84. Gear; 85. Rack; 86. Hinge seat; 87. Through slot; 88. Pull rod;

[0036] 89. Limit component; 891. Fixed plate; 892. Stop bar; 893. Spring. Detailed implementation manners

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0038] See also Figures 1 to 9 A multi-channel NOX sampling probe installed in situ comprises a rainproof box 1, a connecting flange 2 is fixedly connected to one side of the rainproof box 1, a fixing cylinder 3 is fixedly connected to the interior of the connecting flange 2, a sampling probe rod 7 is fixedly connected to the interior of the fixing cylinder 3, a connecting end box 5 is fixedly connected to one side of the lower surface of the rainproof box 1, a heating box 6 is fixedly connected to one side of the inner surface of the rainproof box 1, a sampling assembly 4 is arranged on the inner surface of the heating box 6, and a dust shield assembly 8 is arranged on one side of the sampling probe rod 7.

[0039] The sampling assembly 4 includes a mounting flange 48 fixed to one side of the inner surface of the heating box 6, and an integrated heating device 41 is fixedly connected to one side of the mounting flange 48. A sampling cavity 411 is opened inside the integrated heating device 41, and a through-type filter 49 is arranged on the inner surface of the sampling cavity 411. The through-type filter 49 and the sampling probe 7 adopt a same-diameter through-connection structure. A mounting plate 43 is arranged on one side of the integrated heating device 41, and a NOx sensor 47 is fixedly connected to one side of the mounting plate 43. The NOx sensor 47 is located inside the temperature detection element 412, and a sampling connector 410 is threadedly connected to one side of the mounting plate 43, and a sampling tube 44 is inserted on one side of the sampling connector 410.

[0040] like Figure 4 - Figure 6 As shown, the sampling component 4 includes a mounting flange 48 fixed on one side of the inner surface of the heating box 6, one side of the mounting flange 48 is fixedly connected with an integrated heating device 41, a sampling cavity 411 is opened inside the integrated heating device 41, and a through-type filter 49 is arranged on the inner surface of the sampling cavity 411, a mounting plate 43 is arranged on one side of the integrated heating device 41, a NOx sensor 47 is fixedly connected to one side of the mounting plate 43, and the NOx sensor 47 is located inside the temperature detection element 412, a sampling connector 410 is threadedly connected to one side of the mounting plate 43, a sampling tube 44 is inserted on one side of the sampling connector 410, a three-way valve 45 is arranged on the other end of the sampling tube 44, and a sampling pump 46 is connected to the other end of the three-way valve 45, and a backflush component 42 is arranged on the outer surface of the integrated heating device 41.

[0041] There are three sampling probes 7, and the sampling depth of each sampling probe 7 is different. The sampling probe 7 corresponds to the sampling cavity 411 and one end extends to the interior of the sampling cavity 411. The through-type filter 49 is made of a composite modified polytetrafluoroethylene and a metal sintered material. The through-type filter 49 effectively filters particulate matter in the flue gas. The sampling probe 7 is made of a high-temperature resistant and erosion-resistant material. A three-way valve 45 is provided at the other end of the sampling tube 44, and a sampling pump 46 is connected to the other end of the three-way valve 45. A backblowing component 42 is provided on the outer surface of the integrated heating device 41.

[0042] like Figure 4 - Figure 6 As shown, the back-blowing assembly 42 includes three connecting nozzles 425 connected by threads and an air intake cavity 427 opened at the inner edge of the integrated heating device 41, the inner surface of the air intake cavity 427 is provided with an air intake channel 426, the outer surface of the connecting nozzle 425 is threadedly connected with a connecting valve 421, the top of the connecting valve 421 is inserted with a back-blowing pipe 422, one end of the three back-blowing pipes 422 is fixedly connected with an air intake heating assembly 423, and the outer surface of the air intake heating assembly 423 is connected with an air path connecting end 424.

[0043] The air inlet channel 426 extends to the interior of the sampling cavity 411, the top of the connecting nozzle 425 extends to the interior of the air inlet cavity 427, the bottom of the connecting valve 421 is connected to an ammonia removal pipeline, the ammonia removal pipeline is connected to the ammonia removal device, and the gas circuit connecting end 424 is connected to an external high-pressure gas source.

[0044] A threading hole is provided at the top of the connection terminal box 5, and the connection terminal box 5 is connected to the inside of the rainproof box 1 through the threading hole. The temperature detection element 412 is connected to the control system.

[0045] The sampling cavity 411, the air inlet channel 426 and the air inlet cavity 427 in the integrated heating device 41 form a flow cavity, which increases the contact area between the sampling gas and the ammonia removal agent, thereby improving the ammonia removal efficiency and further improving the sampling accuracy and efficiency. The integrated heating device 41 is easy to disassemble and assemble, and is convenient for replacing reagents or matching. A throttling device is provided at the other end of the sampling pump 46.

[0046] The NOX sensor 47 and the through - type filter 49 are both installed in the integrated heating device 41 of the sampling probe box. When replacing the NOX sensor 47 or the through - type filter 49, there is no need to extract the probe. The whole process is heated at a constant temperature to 200 degrees Celsius and above to avoid low - temperature crystallization of sulfur and ammonia. The through - type filter 49 and the sampling probe rod 7 adopt a co - diameter through - connection structure, and the purging pipeline has no obstruction to ensure the best back - blowing effect. The back - blowing assembly 42 is connected to the through - type filter 49 and can perform regular back - blowing to avoid particle blockage of the filter, and its mesh number, length, and diameter are not restricted. The throttling device is installed at the end of the overall negative - pressure sampling gas path to ensure the stability of the gas intake flow and the pressure of the sampling gas path. The ammonia - removing agent device is installed before the NOX sensor 47 and is used to remove NH3 in the sampled gas. The device is a detachable structure, which is convenient for replacing the ammonia - removing agent and optional installation.

[0047] The through - type filter 49 cooperates with the back - blowing assembly 42. The back - blowing direction is opposite to the gas sampling direction and can perform regular back - blowing. The through - type filter 49 and the sampling probe rod 7 adopt a co - diameter through - connection structure to ensure the best back - blowing effect, effectively reducing the probability of sampling probe blockage and greatly reducing the workload of daily maintenance. At the same time, by integrating three independent NOX sampling units, each unit having a different sampling length, multi - point sampling at different depths is realized, obtaining more comprehensive NOX concentration data. This design enables the sampling probe to provide more accurate ammonia injection control information, significantly improving the efficiency and reliability of ammonia injection optimization.

[0048] Through the automatic linkage of the temperature detection element 412 and the pressure detection sensor built into the temperature detection element 412 with the back - blowing assembly 42, when the detected temperature exceeds the predetermined threshold or the pipeline gas resistance reaches the predetermined threshold, the back - blowing assembly 42 is automatically started to ensure the stable operation of the system, further enhancing the reliability of the sampling probe and making it suitable for industrial applications such as ammonia injection optimization control that require continuous on - line monitoring. This multi - path integrated design not only reduces the maintenance workload but also enables the ammonia injection system to make more precise adjustments based on multi - point sampling data, thereby achieving effective control of NOX concentration.

[0049] As Figure 7 and Figure 8 shown, the ash - blocking assembly 8 includes a hinge seat 86 fixed to one end of the outer surface of the sampling probe rod 7, a telescopic rod 81 slidably connected to the middle of the inside of the fixed cylinder 3, and a side through - slot 87 opened on one side of the inner surface of the fixed cylinder 3. One side of the outer surface of the telescopic rod 81 is fixedly connected with a pull rod 88. Three racks 85 are fixedly connected to the side of the outer surface of the telescopic rod 81 away from the pull rod 88. Inside the hinge seat 86, a C - shaped plate 82 is hinged through a hinge shaft. One side of the C - shaped plate 82 is fixedly connected with a shielding plate 83. Inside the C - shaped plate 82, a gear 84 is fixedly connected through a hinge shaft.

[0050] The rack 85 and the gear 84 are meshed with each other. One side of the pull rod 88 penetrates through the inside of the through groove 87 and slides therewith. The U-shaped plate 82 is fixedly connected to the hinge shaft, and the hinge seat 86 is rotatably connected to the hinge shaft. The outer surface of the fixed cylinder 3 is fixedly connected with a limit assembly 89.

[0051] As Fig. 9 shown, the limit assembly 89 includes two fixed plates 891 fixed on the outer surface of the fixed cylinder 3. The inner top of the fixed plate 891 is fixedly connected with a spring 893, and the bottom of the spring 893 is fixedly connected with a stop rod 892.

[0052] The stop rod 892 is located inside the fixed plate 891. The stop rod 892 is slidably adapted to the fixed plate 891. Limiting plates are arranged on both sides of the stop rod 892. The stop rod 892 is located above the through groove 87.

[0053] When the sampling probe is in use, the probe rod is inserted into the inside of the flue and fixedly connected to the flue through the connecting flange 2. At this time, the pull rod 88 is pulled to drive the telescopic rod 81 to move. The telescopic rod 81 simultaneously drives the three racks 85 to move. The rack 85 drives the gear 84 to rotate. The gear 84 drives the U-shaped plate 82 to rotate through the hinge shaft. The U-shaped plate 82 drives the shielding plate 83 to rotate around the hinge shaft until the shielding plate 83 rotates 90 degrees to open the front end of the sampling probe rod 7, which can ensure that when the sampling probe rod 7 is idle, foreign objects and substances from the outside are prevented from entering the inside of the sampling probe rod 7, preventing blockage inside the sampling probe rod 7 and causing the sampling probe to malfunction. When the pull rod 88 is about to move to the end of the through groove 87, the stop rod 892 is pulled to slide inside the fixed plate 891. When the pull rod 88 passes below the stop rod 892, the stop rod 892 is released at this time, and the elastic force of the spring 893 drives the stop rod 892 to reset. The stop rod 892 moves in front of the pull rod 88, which can effectively limit the pull rod 88, so that the pull rod 88 cannot freely slide inside the through groove 87, and can ensure that the shielding plate 83 continuously remains in the open state without affecting the sampling of the sampling probe rod 7.

[0054] Usage method: During sampling, turn on the sampling pump 46 to work. The flue gas inside the flue passes through the sampling probe 7 and enters the inside of the sampling cavity 411. During the movement of the flue gas, the through-type filter 49 can filter the particulate matter in the flue gas, and the integrated heating device 41 is heated internally to ensure the stable operation of the extraction process. The sampled flue gas passes through the NOX sensor 47, the sampling connector 410, and the sampling pipe 44 and enters the three-way valve 45, and then the flue gas is analyzed by an external analyzer to detect the NOX concentration data. The three groups of sampling probes 7 with different lengths can be configured according to the process requirements to cover different depths of the target area. The sampling cavity 411 can be purged through the purging assembly 42, and the particulate matter attached to the surface of the through-type filter 49 can be blown off to avoid clogging of the through-type filter 49. The temperature detection element 412 can detect the temperature and is used to detect the working temperature of the sampling probe in real time to ensure the operation stability of the system. The ammonia removal pipeline cooperates with the ammonia removal agent device, and the sampling data is comprehensively analyzed through an external data processing module to accurately control the dosage information of the ammonia removal agent sprayed. The ammonia removal agent enters the inside of the sampling cavity 411 through the connecting valve 421, the connecting nozzle 425, the intake cavity 427, and the intake passage 426 in sequence, increasing the contact area between the sampled gas and the ammonia removal agent and removing NH3 in the sampled gas to the greatest extent.

[0055] It is fixedly connected to the flue through the connecting flange 2. At this time, pull the pull rod 88 to drive the telescopic rod 81 to move. The telescopic rod 81 drives the three groups of racks 85 to move at the same time. The rack 85 drives the gear 84 to rotate. The gear 84 drives the U-shaped plate 82 to rotate through the hinge shaft. The U-shaped plate 82 drives the shielding plate 83 to rotate around the hinge shaft until the shielding plate 83 rotates 90 degrees to open the front end of the sampling probe 7, which can ensure that when the sampling probe 7 is idle, foreign objects and substances in the outside world are prevented from entering the inside of the sampling probe 7, and the situation of blockage inside the sampling probe 7 is prevented, resulting in the abnormal use of the sampling probe.

[0056] The above is only the preferred specific implementation mode of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improvement concept, makes equivalent substitutions or changes, and all should be covered by the protection scope of the present invention.

Claims

1. An in-situ mounted multi-channel NOx sampling probe, comprising a rainproof box (1), a connecting flange (2) fixedly connected to one side of the rainproof box (1), a fixing cylinder (3) fixedly connected inside the connecting flange (2), a sampling probe rod (7) fixedly connected inside the fixing cylinder (3), a connecting terminal box (5) fixedly connected to one side of the lower surface of the rainproof box (1), and a heating box (6) fixedly connected to one side of the inner surface of the rainproof box (1); Features: The inner surface of the heating box (6) is provided with a sampling assembly (4), and one side of the sampling probe rod (7) is provided with an ash blocking assembly (8); The sampling assembly (4) comprises a mounting flange (48) fixed to one side of the inner surface of the heating box (6); an integrated heating device (41) is fixedly connected to one side of the mounting flange (48); a sampling cavity (411) is provided inside the integrated heating device (41); a through-type filter (49) is provided on the inner surface of the sampling cavity (411); the through-type filter (49) and the sampling probe (7) adopt a same-diameter through-connection structure; a mounting plate (43) is provided on one side of the integrated heating device (41); a NOx sensor (47) is fixedly connected to one side of the mounting plate (43); the NOx sensor (47) is located inside the temperature detection element (412); a sampling connector (410) is threadedly connected to one side of the mounting plate (43); a sampling tube (44) is inserted into one side of the sampling connector (410).

2. The in-situ installed multi-channel NOX sampling probe according to claim 1, characterized in that: The number of the sampling probes (7) is three, and the sampling depth of each sampling probe (7) is different. The sampling probe (7) corresponds to the sampling cavity (411) and one end of the sampling probe extends to the interior of the sampling cavity (411). The through-type filter (49) is made of a composite modified polytetrafluoroethylene and a metal sintered material. The through-type filter (49) effectively filters particulate matter in the flue gas. The sampling probe (7) is made of a high-temperature resistant and erosion-resistant material. A three-way valve (45) is provided at the other end of the sampling tube (44), and a sampling pump (46) is connected to the other end of the three-way valve (45). A backflush assembly (42) is provided on the outer surface of the integrated heating device (41).

3. The in-situ installed multi-channel NOX sampling probe according to claim 2, characterized in that: The back-blowing assembly (42) comprises three connecting nozzles (425) connected by threads and an air intake cavity (427) opened at the inner edge of the integrated heating device (41); an air intake channel (426) is opened on the inner surface of the air intake cavity (427); a connecting valve (421) is threadedly connected to the outer surface of the connecting nozzle (425); a back-blowing pipe (422) is inserted at the top of the connecting valve (421); one end of the three back-blowing pipes (422) is fixedly connected to an air intake heating assembly (423); and the outer surface of the air intake heating assembly (423) is connected to an air path connecting end (424).

4. The in-situ installed multi-channel NOX sampling probe according to claim 3, characterized in that: The intake passage (426) extends into the interior of the sampling cavity (411), the top of the connecting nozzle (425) extends into the interior of the intake cavity (427), the bottom of the connecting valve (421) is connected with an ammonia removal pipeline, the ammonia removal pipeline is connected with an ammonia removal agent device, and the gas path connection end (424) is connected with an external high-pressure gas source.

5. The in-situ installed multi-channel NOX sampling probe according to claim 4, characterized in that: A wire threading hole is provided at the inner top of the connection terminal junction box (5), the connection terminal junction box (5) is interconnected with the interior of the rainproof box (1) through the wire threading hole, the temperature detection element (412) is connected with the control system, and the temperature detection element (412) is internally provided with a pressure detection sensor.

6. The in-situ installed multi-channel NOX sampling probe according to claim 5, characterized in that: The sampling cavity (411), the intake passage (426) and the intake cavity (427) in the integrated heating device (41) form a flowing cavity, which increases the contact area between the sampling gas and the ammonia removal agent, thereby improving the ammonia removal efficiency and further enhancing the sampling accuracy and efficiency. The integrated heating device (41) is convenient for disassembly and assembly, facilitating the replacement of reagents or selection and matching. The other end of the sampling pump (46) is provided with a throttling device.

7. The in-situ installed multi-channel NOX sampling probe according to claim 6, characterized in that: The ash blocking assembly (8) includes a hinge seat (86) fixed at one end of the outer surface of the sampling probe (7), a telescopic rod (81) slidably connected to the middle of the interior of the fixed cylinder (3), and a side through groove (87) opened on one side of the inner surface of the fixed cylinder (3). A pull rod (88) is fixedly connected to one side of the outer surface of the telescopic rod (81), and three racks (85) are fixedly connected to the side of the outer surface of the telescopic rod (81) away from the pull rod (88). A U-shaped plate (82) is hinged inside the hinge seat (86) through a hinge shaft, a shielding plate (83) is fixedly connected to one side of the U-shaped plate (82), and a gear (84) is fixedly connected to the inside of the U-shaped plate (82) through a hinge shaft.

8. The in-situ installed multi-channel NOX sampling probe according to claim 7, characterized in that: The rack (85) and the gear (84) are meshed with each other, one side of the pull rod (88) penetrates through the inside of the through groove (87) and slides mutually, the U-shaped plate (82) is fixedly connected with the hinge shaft, the hinge seat (86) is rotatably connected with the hinge shaft, and a limiting assembly (89) is fixedly connected to the outer surface of the fixed cylinder (3).

9. The in-situ installed multi-channel NOX sampling probe according to claim 8, characterized in that: The limiting assembly (89) includes two fixing plates (891) fixed on the outer surface of the fixed cylinder (3), a spring (893) is fixedly connected to the inner top of the fixing plate (891), and a stop rod (892) is fixedly connected to the bottom of the spring (893).

10. The in-situ installed multi-channel NOX sampling probe according to claim 9, characterized in that: The stop rod (892) is located inside the fixing plate (891), the stop rod (892) is slidably adapted to the fixing plate (891), limiting plates are arranged on both sides of the stop rod (892), and the stop rod (892) is located above the through groove (87).

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