In-situ installation multi-path NOX sampling probe

Abstract

The utility model discloses an in-situ installation multipath NOX sampling probe, which belongs to the field of sampling probes and 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 utility model relates to sampling probe field more specifically, relate to a kind of in situ installation multi-channel NOX sampling probe. BACKGROUND

[0002] Nitrogen oxide (NOX) refers to nitrogen oxide general name, mainly including nitric oxide (NO) and nitrogen dioxide (NO2), they are one of air pollutants, cause serious threat to environment and human health, NOX emission usually comes from combustion process, for example, thermal power plant, automobile emission, industrial combustion etc., effectively monitor and control NOX emission is not only the demand of environmental protection, also meet the increasingly stringent emission standards requirement, for this reason, develop a kind of high-efficiency, accurate NOX sampling probe is particularly important

[0003] The existing NOX sampling probe usually has the problem of easy clogging of the sampling head, especially in the ammonia injection optimization control process, the accuracy and real-time of NOX concentration measurement are crucial;However, the conventional filter is located at the head of the probe, which is easy to cause clogging in a high particulate matter environment, resulting in reduced sampling efficiency, and unable to guarantee the accuracy and real-time of NOX concentration measurement, affecting the control accuracy and reliability of the system. SUMMARY

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a kind of in situ installation multi-channel NOX sampling probe.

[0005] To solve the above problems, the utility model adopts the following technical scheme.

[0006] A kind of in situ installation multi-channel NOX sampling probe, including rainproof box, the one side of rainproof box is fixedly connected with the connecting flange, the inside of connecting flange is fixedly connected with fixed cylinder, the inside of fixed cylinder is fixedly connected with sampling probe rod, the one side of rainproof box lower surface is fixedly connected with connection end wire box, the one side of rainproof box inner surface is fixedly connected with heating box, the inside of heating box is provided with sampling assembly, the one side of sampling probe rod is provided with dustproof assembly.

[0007] The sampling assembly includes a mounting flange fixed to the inner surface of the heating box, the mounting flange is fixedly connected with an integrated heating device on one side, the integrated heating device has a sampling cavity inside, the inner surface of the sampling cavity is provided with a through filter, the through filter and the sampling probe rod are connected in the same diameter through connection structure, the integrated heating device is provided with a mounting plate on one side, the mounting plate is fixedly connected with a NOX sensor on one side, the NOX sensor is located inside the temperature detection element, the mounting plate is threadedly connected with a sampling connector on one side, the sampling connector is inserted with a sampling tube on one side.

[0008] Further, the number of sampling probes is three, and the sampling depth of each sampling probe is different, the sampling probe corresponds to the sampling cavity and extends to the inside of the sampling cavity at one end, the material of the through filter is a combination of modified four fluorine and metal sintered material, the through filter effectively filters particulate matter in flue gas, the material of the sampling probe is selected from high-temperature resistant and erosion resistant materials, the other end of the sampling tube is provided with a three-way valve, the other end of the three-way valve is connected with a sampling pump, and the outer surface of the integrated heating device is provided with a back blowing assembly.

[0009] Further, the back blowing assembly comprises three connecting mouths connected by threads and an air inlet cavity opened at the inner edge of the integrated heating device, an air inlet channel is opened in the inner surface of the air inlet cavity, a connecting valve is threadedly connected to the outer surface of the connecting mouth, a back blowing pipe is inserted into the top of the connecting valve, an air inlet heating assembly is fixedly connected to one end of the three back blowing pipes, and an air path connecting end is communicated with the outer surface of the air inlet heating assembly.

[0010] Further, the air inlet channel extends to the inside of the sampling cavity, the top of the connecting mouth extends to the inside of the air inlet cavity, the bottom of the connecting valve is connected with an ammonia removal pipeline, the ammonia removal pipeline is connected with an ammonia removal agent device, and the air path connecting end is connected with an external high-pressure gas source.

[0011] Further, a threading hole is opened in the top of the connecting end wire box, the connecting end wire box is connected with the inside of the rainproof box through the threading hole, and the temperature detection element is connected with the control system.

[0012] Further, the sampling cavity, the air inlet channel and the air inlet cavity in the integrated heating device form a flow-through cavity, the contact area of the sampling gas and the ammonia removal agent is increased, the ammonia removal efficiency is improved, the sampling precision and efficiency are further improved, the integrated heating device is convenient to disassemble and assemble, and the reagent or accessories can be replaced or selected, and the other end of the sampling pump is provided with a throttling device.

[0013] Further, the dust blocking assembly comprises a hinged seat fixed at one end of the outer surface of the sampling probe, a telescopic rod slidingly connected at the middle of the inner surface of the fixed cylinder and a through slot opened at one side of 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 away from the pull rod, a U-shaped plate is hinged to the inside of the hinged seat through a hinge shaft, a shielding plate is fixedly connected to one side of the U-shaped plate, and a gear is fixedly connected to the inside of the U-shaped plate through the hinge shaft.

[0014] Further, the rack and pinion are engaged with each other, one side of the pull rod penetrates the inside of the through slot and slides with each other, the U-shaped plate is fixedly connected with the hinge shaft, the hinge seat is rotationally connected with the hinge shaft, and the outer surface of the fixed cylinder is fixedly connected with the limiting assembly.

[0015] Further, the limiting assembly comprises two fixed plates fixed on the outer surface of the fixed cylinder, the inner top of the fixed plate is fixedly connected with a spring, and the bottom of the spring is fixedly connected with a blocking rod.

[0016] Further, the blocking rod is located in the inside of the fixed plate, the blocking rod and the fixed plate are slidably matched with each other, the two sides of the blocking rod are provided with limiting plates, and the blocking rod is located above the through slot.

[0017] Compared with the prior art, the utility model has the beneficial effects of:

[0018] 1. The through filter cooperates with the back blowing device, the back blowing direction is opposite to the gas sampling direction and can be back blown regularly, the through filter and the sampling probe rod adopt the same diameter through connection structure, the sweeping pipeline is not hindered, so that the best back blowing effect is guaranteed, the probability of sampling probe blockage is effectively reduced, the daily maintenance workload is greatly reduced, meanwhile, three independent NOX sampling units are integrated, each unit has different sampling length, multi-point sampling of different depths is realized, more comprehensive NOX concentration data are acquired, the sampling probe can provide more accurate ammonia injection control information, and the efficiency and reliability of ammonia injection optimization are remarkably improved.

[0019] 2. When the temperature exceeds the predetermined threshold value or the gas resistance in the pipeline reaches the predetermined threshold value, the temperature detection element and the pressure detection sensor built-in the temperature detection element are automatically linked with the back blowing device, so that the pipeline and the through filter are blown and controlled, the back blowing device is automatically started, the system is ensured to stably operate, the reliability of the sampling probe is further improved, the sampling probe is applicable to industrial occasions, such as ammonia injection optimization control, which needs continuous online monitoring, the multi-way integrated design not only reduces the maintenance workload, but also enables the ammonia injection system to be more accurately adjusted according to the multi-point sampling data, so that the NOX concentration is effectively controlled, and constant heating to 200 degrees Celsius or above is adopted throughout the process to avoid sulfur and ammonia low-temperature crystallization. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The structure of the utility model is shown Figure 1 ;

[0021] Figure 2 The structure of the utility model is shown Figure 2 ;

[0022] Figure 3It is the internal structure schematic view of the rainproof box of the utility model;

[0023] Figure 4 It is the sampling assembly structure schematic view of the utility model;

[0024] Figure 5 It is the sectional structure schematic view of the integrated heating device of the utility model Figure 1 ;

[0025] Figure 6 It is the sectional structure schematic view of the integrated heating device of the utility model Figure 2 ;

[0026] Figure 7 It is the dust blocking assembly structure schematic view of the utility model Figure 1 ;

[0027] Figure 8 It is the dust blocking assembly structure schematic view of the utility model Figure 2 ;

[0028] Figure 9 It is the limiting assembly structure schematic view of the utility model.

[0029] Mark explanation in drawing:

[0030] 1, rainproof box; 2, connecting flange; 3, fixed cylinder;

[0031] 4, sampling assembly; 41, integrated heating device;

[0032] 42, back flushing assembly; 421, connecting valve; 422, back flushing pipe; 423, air inlet heating assembly; 424, gas path connecting end; 425, connecting mouth; 426, air inlet passage; 427, air inlet 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 connecting head; 411, sampling cavity; 412, temperature detection element;

[0034] 5, connecting end wire box; 6, heating box; 7, sampling probe rod;

[0035] 8, dust blocking assembly; 81, telescopic rod; 82, U-shaped plate; 83, shielding plate; 84, gear; 85, rack; 86, hinged seat; 87, through slot; 88, pull rod;

[0036] 89, limiting assembly; 891, fixed plate; 892, blocking rod; 893, spring. DETAILED DESCRIPTION

[0037] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments, and based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0038] Please refer to Figures 1 to 9 A multi-channel NOX sampling probe is installed in situ, comprising a rainproof box 1, one side of the rainproof box 1 is fixedly connected with a connecting flange 2, the inside of the connecting flange 2 is fixedly connected with a fixed cylinder 3, the inside of the fixed cylinder 3 is fixedly connected with a sampling probe rod 7, one side of the lower surface of the rainproof box 1 is fixedly connected with a connecting terminal wire box 5, one side of the inner surface of the rainproof box 1 is fixedly connected with a heating box 6, 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 a dust blocking assembly 8.

[0039] The sampling assembly 4 comprises 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, the inside of the integrated heating device 41 is provided with a sampling cavity 411, the inner surface of the sampling cavity 411 is provided with a through filter 49, the through filter 49 and the sampling probe rod 7 adopt a same-diameter through connection structure, one side of the integrated heating device 41 is provided with a mounting plate 43, one side of the mounting plate 43 is fixedly connected with a NOX sensor 47, the NOX sensor 47 is located in the inside of a temperature detection element 412, one side of the mounting plate 43 is threadedly connected with a sampling connector 410, one side of the sampling connector 410 is inserted with a sampling pipe 44.

[0040] As shown in Figure 4 - Figure 6 The sampling assembly 4 comprises 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, the inside of the integrated heating device 41 is provided with a sampling cavity 411, the inner surface of the sampling cavity 411 is provided with a through filter 49, one side of the integrated heating device 41 is provided with a mounting plate 43, one side of the mounting plate 43 is fixedly connected with a NOX sensor 47, the NOX sensor 47 is located in the inside of a temperature detection element 412, one side of the mounting plate 43 is threadedly connected with a sampling connector 410, one side of the sampling connector 410 is inserted with a sampling pipe 44, the other end of the sampling pipe 44 is provided with a three-way valve 45, the other end of the three-way valve 45 is connected with a sampling pump 46, and the outer surface of the integrated heating device 41 is provided with a back flushing assembly 42.

[0041] 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 extends to the inside of the sampling cavity 411 at one end, the material of the through filter 49 is combined with modified four fluorine and metal sintering material, the through filter 49 effectively filters particulate matters in flue gas, the material of the sampling probe 7 is selected from high-temperature-resistant and erosion-resistant materials, the other end of the sampling tube 44 is provided with a three-way valve 45, the other end of the three-way valve 45 is connected with a sampling pump 46, and the outer surface of the integrated heating device 41 is provided with a back flushing assembly 42.

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

[0043] The air inlet channel 426 extends to the inside of the sampling cavity 411, the top of the connecting mouth 425 extends to the inside of the air inlet 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 air path connecting end 424 is connected with an external high-pressure gas source.

[0044] A threading hole is opened in the inner top of the connecting end wire box 5, the connecting end wire box 5 is connected with the inside of the rainproof box 1 through the threading hole, and the temperature detection element 412 is connected with a 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-through cavity, the contact area of the sampling gas and the ammonia removal agent is increased, the ammonia removal efficiency is improved, the sampling precision and efficiency are further improved, the integrated heating device 41 is convenient to disassemble and assemble, and the reagent or accessories can be replaced or selected, and the other end of the sampling pump 46 is provided with a throttling device.

[0046] ​NOX sensor 47 and through filter 49 are both installed in integrated heating device 41 of sampling probe box, and when replacing NOX sensor 47 or through filter 49, the probe does not need to be pulled out, and the whole process is heated to 200 degrees Celsius or above at a constant temperature to avoid sulfur and ammonia low-temperature crystallization, through filter 49 and sampling probe 7 adopt the same diameter through connection structure, the purge pipeline is not hindered to ensure the best back flushing effect, back flushing assembly 42 is communicated with through filter 49, can be back flushed regularly, avoid particle clogging filter, and the mesh number, length and diameter are not limited, the throttling device is installed at the last end of the whole negative pressure sampling gas path to ensure the stability of the gas flow and the sampling gas path pressure, the ammonia removal agent device is installed before NOX sensor 47 for removing NH3 in the sample gas, the device is a detachable structure, which is convenient for replacing the ammonia removal agent and optional.

[0047] Through filter 49 cooperates with back flushing assembly 42, the back flushing direction is opposite to the gas sampling direction and can be back flushed regularly, through filter 49 and sampling probe 7 adopt the same diameter through connection structure to ensure the best back flushing effect, effectively reduce the probability of sampling probe clogging, greatly reduce the daily maintenance workload, at the same time, through the integration of three independent NOX sampling units, each unit has different sampling length, multi-point sampling of different depths is realized, more comprehensive NOX concentration data is obtained, this design makes the sampling probe can provide more accurate ammonia injection control information, significantly improves the efficiency and reliability of ammonia injection optimization.

[0048] Through the automatic linkage of temperature detection element 412 and pressure detection sensor built-in temperature detection element 412 and back flushing assembly 42, when the temperature exceeds the predetermined threshold or the pipeline gas resistance reaches the predetermined threshold, the back flushing assembly 42 is automatically started to ensure the stable operation of the system, further improve the reliability of the sampling probe, make it suitable for industrial occasions such as ammonia injection optimization control which need continuous online monitoring, the multi-channel integrated design not only reduces the maintenance workload, but also makes the ammonia injection system can make more accurate adjustment according to the multi-point sampling data, so as to realize the effective control of NOX concentration.

[0049] As shown in Figure 7 and Figure 8 , the dust blocking assembly 8 includes a hinge seat 86 fixed to one end of the outer surface of the sampling probe 7, a telescopic rod 81 slidingly connected in the middle of the inner surface of the fixed cylinder 3, and a 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, one side of the outer surface of the telescopic rod 81 away from the pull rod 88 is fixedly connected with three groups of racks 85, the inside of the hinge seat 86 is hinged with a U-shaped plate 82 through a hinge shaft, one side of the U-shaped plate 82 is fixedly connected with a shielding plate 83, and the inside of the U-shaped plate 82 is fixedly connected with a gear 84 through a hinge shaft.

[0050] The rack 85 and the gear 84 are engaged with each other, one side of the pull rod 88 penetrates the inside of the through slot 87 and slides with each other, the Z-shaped plate 82 is fixedly connected with the hinge shaft, the hinge seat 86 is rotatably connected with the hinge shaft, and the outer surface of the fixed cylinder 3 is fixedly connected with the limiting assembly 89.

[0051] As shown in Figure 9 The limiting assembly 89 comprises 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 in the inside of the fixed plate 891, the stop rod 892 and the fixed plate 891 slide with each other, the two sides of the stop rod 892 are provided with limiting plates, and the stop rod 892 is located above the through slot 87.

[0053] When the sampling probe is used, the probe rod is stretched into the inside of the flue, and is fixedly connected with 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 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 Z-shaped plate 82 to rotate through the hinge shaft, and the Z-shaped plate 82 drives the shielding plate 83 to rotate around the hinge shaft until the shielding plate 83 is rotated by ninety degrees to open the front end of the sampling probe 7. It can be guaranteed that when the sampling probe 7 is idle, foreign matters and substances in the outside can be prevented from entering the inside of the sampling probe 7, and the inside of the sampling probe 7 is prevented from being blocked, so that the sampling probe cannot be normally used. When the pull rod 88 is about to move to the end of the through slot 87, the stop rod 892 is pulled to slide in the inside of the fixed plate 891, and when the pull rod 88 passes below the stop rod 892, the stop rod 892 is released at this time and is driven to reset by the elastic force of the spring 893. The stop rod 892 moves to the front of the pull rod 88, can effectively limit the pull rod 88, so that the pull rod 88 cannot freely slide in the inside of the through slot 87, and the shielding plate 83 can be guaranteed to continuously maintain an open state, and sampling of the sampling probe 7 will not be affected.

[0054] Use method: when sampling, open the sampling pump 46 to work, the flue gas in the flue enters the inside of the sampling cavity 411 through the sampling probe 7, the through filter 49 can filter the particulate matters in the flue gas during the movement of the flue gas, the inside of the integrated heating device 41 is heated to ensure the stable operation of the extraction process, the sampled flue gas enters the inside of the three-way valve 45 through the NOX sensor 47, the sampling connector 410 and the sampling pipe 44, and then is analyzed by the external analysis instrument, the NOX concentration data is detected, 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 backflushed through the backflush assembly 42, the particulate matters attached to the surface of the through filter 49 can be blown off to avoid the blockage of the through filter 49, the temperature detection element 412 can detect the temperature for real-time detection of the working temperature of the sampling probe 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 by the 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 gas inlet cavity 427 and the gas inlet channel 426, the contact area of the sampling gas and the ammonia removal agent is increased, and the NH3 in the sample gas is removed to the maximum extent.

[0055] The connecting flange 2 is fixedly connected with the flue, 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 groups of racks 85 to move, the racks 85 drive the gears 84 to rotate, the gears 84 drive the H-shaped plates 82 to rotate through the hinge shafts, the H-shaped plates 82 drive the shielding plates 83 to rotate around the hinge shafts, until the shielding plates 83 are rotated by ninety degrees to open the front end of the sampling probe 7, so that the sampling probe 7 can be prevented from being blocked by foreign matters and substances in the outside when the sampling probe 7 is idle, and the sampling probe 7 can be prevented from being blocked to cause the sampling probe to be unable to be normally used.

[0056] The above merely describes a preferred embodiment of the present application; however, the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes to the technical scheme of the present application and the improvement concept thereof within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A multi-channel NOX sampling probe installed in situ, comprising a rainproof box (1), one side of the rainproof box (1) is fixedly connected with a connecting flange (2), the inside of the connecting flange (2) is fixedly connected with a fixed cylinder (3), the inside of the fixed cylinder (3) is fixedly connected with a sampling probe rod (7), one side of the lower surface of the rainproof box (1) is fixedly connected with a connecting terminal wire box (5), one side of the inner surface of the rainproof box (1) is fixedly connected with a heating box (6); characterized in that A sampling assembly (4) is arranged on the inner surface of the heating box (6), and a dust blocking assembly (8) is arranged on one side of the sampling probe rod (7); The sampling assembly (4) comprises 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), the inside of the integrated heating device (41) is provided with a sampling cavity (411), the inner surface of the sampling cavity (411) is provided with a through filter (49), the through filter (49) and the sampling probe rod (7) are connected in the same diameter through connection structure, one side of the integrated heating device (41) is provided with a mounting plate (43), one side of the mounting plate (43) is fixedly connected with a NOX sensor (47), the NOX sensor (47) is located in the inside of a temperature detection element (412), one side of the mounting plate (43) is threadedly connected with a sampling connector (410), one side of the sampling connector (410) is inserted with a sampling pipe (44).

2. The in-situ mounted multi-channel NOx sampling probe according to claim 1, wherein: The number of the sampling probe rod (7) is three, and the sampling depth of each sampling probe rod (7) is different, the sampling probe rod (7) corresponds to the sampling cavity (411) and extends to the inside of the sampling cavity (411) at one end, the material of the through filter (49) is combined with composite modified PTFE and metal sintering material, the through filter (49) effectively filters particulate matters in flue gas, the material of the sampling probe rod (7) is selected from high-temperature-resistant and erosion-resistant materials, the other end of the sampling pipe (44) is provided with a three-way valve (45), the other end of the three-way valve (45) is connected with a sampling pump (46), and the outer surface of the integrated heating device (41) is provided with a back blowing assembly (42).

3. The in-situ mountable multi-channel NOx sampling probe according to claim 2, wherein: The back blowing assembly (42) comprises three connecting mouths (425) connected by threads and an air inlet cavity (427) formed at the edge of the inside of the integrated heating device (41), the inner surface of the air inlet cavity (427) is provided with an air inlet channel (426), the outer surface of the connecting mouth (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 inlet heating assembly (423), and the outer surface of the air inlet heating assembly (423) is communicated with an air path connecting end (424).

4. The in-situ mountable multi-channel NOx sampling probe according to claim 3, wherein: The air inlet channel (426) extends to the inside of the sampling cavity (411), the top of the connecting nozzle (425) extends to the inside of the air inlet cavity (427), the bottom of the connecting valve (421) is connected with an ammonia removal pipeline connected with an ammonia removal agent device, and the air path connecting end (424) is connected with an external high-pressure gas source.

5. An in-situ mountable multi-channel NOx sampling probe according to claim 4, wherein: The inside top of the connecting end wire box (5) is provided with a wire passing hole, the connecting end wire box (5) is connected with the inside of the rainproof box (1) through the wire passing hole, the temperature detection element (412) is connected with a control system, and the temperature detection element (412) is provided with a pressure detection sensor.

6. An in-situ mountable multi-channel NOx sampling probe according to claim 5, wherein: The sampling cavity (411), the air inlet channel (426) and the air inlet cavity (427) in the integrated heating device (41) form a flow-through cavity, the contact area of the sampling gas and the ammonia removal agent is increased, the ammonia removal efficiency is improved, the sampling precision and efficiency are further improved, the integrated heating device (41) is convenient to disassemble and assemble, and the reagent can be replaced or selected, and the sampling pump (46) is provided with a throttling device at the other end.

7. An in-situ mounted multi-channel NOx sampling probe according to claim 6, wherein: The dust blocking assembly (8) comprises a hinged seat (86) fixed at one end of the outer surface of the sampling probe rod (7), a telescopic rod (81) slidingly connected at the middle of the inside of the fixed cylinder (3), and a through slot (87) formed in 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), and one side of the outer surface of the telescopic rod (81) away from the pull rod (88) is fixedly connected with three groups of racks (85). The inside of the hinged seat (86) is hinged with a'shaped plate (82) through a hinge shaft, one side of the'shaped plate (82) is fixedly connected with a shielding plate (83), and the inside of the'shaped plate (82) is fixedly connected with a gear (84) through a hinge shaft.

8. The in-situ mounted multi-channel NOx sampling probe according to claim 7, wherein: 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 slot (87) and slides with each other, the'shaped plate (82) and the hinge shaft are fixedly connected with each other, and the hinged seat (86) and the hinge shaft are rotatably connected with each other. The outer surface of the fixed cylinder (3) is fixedly connected with a limiting assembly (89).

9. The in-situ mountable multi-channel NOx sampling probe according to claim 8, wherein: The limiting assembly (89) comprises two fixed plates (891) fixed on the outer surface of the fixed cylinder (3), and springs (893) fixedly connected to the inner top of the fixed plates (891). The bottom of the spring (893) is fixedly connected with a blocking rod (892).

10. The in-situ mountable multi-channel NOx sampling probe according to claim 9, wherein: The blocking rod (892) is located in the inside of the fixed plate (891), the blocking rod (892) and the fixed plate (891) slide with each other, the blocking rod (892) is provided with limiting plates on both sides, and the blocking rod (892) is located above the through slot (87).

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