Stationary pollution source waste gas sampling and detecting equipment

Abstract

The invention discloses stationary pollution source waste gas sampling detection equipment, and relates to the technical field of intelligent detection, the stationary pollution source waste gas sampling detection equipment comprises a sampling gun, the sampling gun comprises a collection part and a control part, the collection part is sequentially provided with an outer pipe, a heat preservation layer, a temperature control layer, an insulation layer and an inner pipe from outside to inside, the control part comprises a handle part, a built-in data processor and a display screen installed on the outer surface of the handle part, a built-in air pump is installed at the end, close to the collecting part, of the interior of the handle part, the input end of the built-in air pump is communicated with the inner pipe, and the input end of the built-in air pump is at least connected with a direct detection pipeline and / or a collecting pipeline through a pipeline; a first connecting ring and a second connecting ring respectively penetrate through the front end and the middle part of the collecting part and are hermetically connected with the front end and the middle part of the collecting part, the first connecting ring and the second connecting ring are arranged on the outer surface of the outer pipe in a sleeving manner, the equipment realizes sampling and self-checking integration of waste gas of a stationary pollution source, and the intelligent use of the equipment is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of intelligent detection technology, specifically to a sampling and detection device for exhaust gas from stationary pollution sources. Background Technology

[0002] Stationary pollution sources, as opposed to mobile pollution sources such as automobiles and trains, typically refer to locations, equipment, and devices that discharge hazardous substances into the environment at fixed locations, such as factory chimneys, exhaust stacks, boilers, or industrial furnaces. With industrial development, the environmental impact of hazardous substances such as gaseous ammonia and particulate ammonium salts emitted from stationary pollution sources is becoming increasingly serious, making routine waste gas sampling and testing essential.

[0003] Currently, heated sampling guns are becoming increasingly mainstream in waste gas sampling and testing. These guns are core sampling and testing equipment used in stationary pollution source waste gas sampling to address sample loss caused by flue gas condensation. Their main function is to ensure that gaseous pollutants remain in their original state during transmission from the flue to the analytical equipment through active heating and precise temperature control, preventing condensation and adsorption. However, how to further improve the intelligent use of this type of sampling and testing equipment remains a problem to be solved by researchers in this field. Summary of the Invention

[0004] The purpose of this invention is to provide a sampling and detection device for exhaust gas from stationary pollution sources to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a sampling and detection device for waste gas from a fixed pollution source, comprising a sampling gun, the sampling gun including a collection section and a control section. The collection section is provided with an outer tube, a heat insulation layer, a temperature control layer, an insulation layer, and an inner tube arranged sequentially from the outside to the inside. The control section includes a handle, a built-in data processor, and a display screen mounted on the outer surface of the handle. A built-in air pump is installed inside the handle near the collection section. The input end of the built-in air pump is connected to the inner tube. The input end of the built-in air pump is connected to at least a direct detection pipe and / or a collection pipe through a pipe. A first connecting ring and a second connecting ring are respectively passed through and sealed at the front end and middle position of the collection section. Connecting rings, a first connecting ring and a second connecting ring, are sleeved on the outer surface of the outer tube. A first flow pressure gauge and a second flow pressure gauge are respectively installed on the surface of the first connecting ring and the second connecting ring. The detection ends of the first flow pressure gauge and the second flow pressure gauge are inserted into the inner tube. The insertion points are respectively recorded as the first pressure detection point and the second pressure detection point. The measured pressure data are respectively recorded as the first pressure value F1 and the second pressure value F2. The first flow pressure gauge and the second flow pressure gauge are connected to the data processor of the control unit. The front end of the first connecting ring is connected to a sampling bend tube through and sealed. The front end of the sampling bend tube is set as the sampling port. A filter screen is installed on the sampling bend tube facing the sampling port.

[0006] The present invention further describes that a particle collection part is connected through and sealed to the collection part near the handle part. The inside of the particle collection part is connected to the inside of the inner tube. A filter membrane is installed inside the particle collection part in a direction perpendicular to the central axis of the inner tube. A second connecting ring is disposed at the front end of the particle collection part.

[0007] The present invention further describes that an auxiliary frame is installed on the outer surface of the outer tube located between the particle collection part and the handle part via an ear seat. The auxiliary frame has a U-shaped structure, and a placement box is fixedly installed on the auxiliary frame. The absorption part is placed inside the placement box, and the absorption liquid of the absorption part is dilute sulfuric acid.

[0008] The present invention further explains that the absorption section includes at least a first absorption tube, a second absorption tube, and a third absorption tube arranged in series, and the other end of the collection pipe is connected to the interior of the first absorption tube.

[0009] The present invention further describes that the top of the placement box is provided with a cover, the cover and the inside of the placement box form a sealed storage cavity, and the sealed storage cavity is provided with a heat insulation structure and an ice-water mixture.

[0010] The present invention further illustrates that an early warning tube is detachably installed on the surface of the auxiliary frame adjacent to the third absorption tube. The early warning tube is connected to the third absorption tube and an indicator is installed inside the early warning tube for early warning of ammonia penetration.

[0011] The present invention further describes that a hollow tube is installed around the front half of the outer tube, with the front port of the hollow tube facing the sampling port of the acquisition bend. The rear port of the hollow tube is sealed to a first auxiliary tube via a flange. A first control valve is installed on the first auxiliary tube. A second auxiliary tube is sealed to the inside of a second connecting ring. The port of the second auxiliary tube inside the second connecting ring passes through the sampling section and communicates with the inner tube. A second control valve is installed on the second auxiliary tube. The first control valve and the second control valve are signal-connected to the data processor.

[0012] The present invention further illustrates that the other ends of the first auxiliary pipe and the second auxiliary pipe are connected to a bidirectional air pump through a three-way pipe, and a temperature and humidity sensing unit is fixedly connected to the bottom of the auxiliary frame. The temperature and humidity sensing unit is connected to the data processing unit via a signal.

[0013] The present invention further describes that the bidirectional air pump is fixedly installed on one side of the outer wall of the temperature and humidity sensing unit. The output end of the bidirectional air pump is connected to a three-way control valve through a pipe. One valve port of the three-way control valve is connected to a first output pipe. The first output pipe is connected to the detection end of the temperature and humidity sensing unit. The discharge end of the temperature and humidity sensing unit is connected to an auxiliary recovery pipe. The other end of the auxiliary recovery pipe is connected to a third absorption pipe.

[0014] The present invention further illustrates that the other valve port of the three-way control valve is connected to a second output pipe, and the other end of the second output pipe is connected to an air extraction pipe and an exhaust pipe respectively through a three-way pipe. A third control valve and a fourth control valve are respectively connected to the air extraction pipe and the exhaust pipe. The third control valve and the fourth control valve are both connected to the data processing unit for signal connection. The air extraction pipe is connected to the external air, and the exhaust pipe is connected to a recovery box.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The present invention adopts a pipeline design of a data processor, a first connecting ring, a second connecting ring, a first flow pressure meter, a second flow pressure meter, a temperature and humidity sensing unit, and a hollow tube. It can not only adjust the heating temperature and the collection flow rate according to the actual temperature and humidity data to achieve high-efficiency collection, but also detect, intelligently clean, and alarm abnormal usage of the device, realize integrated sampling and self-inspection, and improve the intelligent use of the device. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the acquisition unit of the present invention; Figure 3 This is the present invention. Figure 1 A schematic diagram of the rear view structure; Figure 4 This is the present invention. Figure 1 Front view structural diagram; Figure 5 This is a rear view schematic diagram of the auxiliary frame of the present invention; Figure 6 This is the present invention. Figure 4 Enlarged schematic diagram of the structure of region A; In the diagram: 1. Outer tube; 2. Inner tube; 3. Temperature control layer; 4. Insulation layer; 5. Heat insulation layer; 6. First connecting ring; 7. Second connecting ring; 8. Collection bend; 9. First flow and pressure gauge; 10. Second flow and pressure gauge; 11. Hollow tube; 12. Particle collection unit; 13. Handle unit; 14. Direct inspection pipe; 15. Collection pipe; 16. Auxiliary frame; 17. Temperature and humidity sensing unit; 18. Absorption unit; 181. First absorption tube; 182. Second absorption tube; 183. Third absorption tube; 19. Warning tube; 20. First auxiliary tube; 21. First control valve; 22. Second auxiliary tube; 23. Second control valve; 24. Two-way air pump; 25. Three-way control valve; 26. First output tube; 27. Second output tube; 28. Slide; 29. ​​Support unit; 30. Auxiliary recovery tube. Detailed Implementation

[0017] The following detailed, non-limiting description of the technical solution of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0018] Please refer to Figures 1 to 6 This invention provides a technical solution: a sampling and detection device for waste gas from a stationary pollution source, comprising a sampling gun for collecting ammonia and particulate ammonium salts from the waste gas at the stationary pollution source. Specifically, the sampling gun includes a collection section and a control section. The collection section of the sampling gun is arranged from the outside to the inside as follows: an outer tube 1, a heat insulation layer 5, a temperature control layer 3, an insulating layer 4, and an inner tube 2. The inner tube 2 is used for direct contact with the waste gas and is preferably made of polyvinylidene fluoride or a stainless steel inner sleeve high-temperature tempered glass tube structure to minimize the adhesion of ammonia and particulate ammonium salts during transportation, while also being able to withstand high temperatures. The temperature control layer 3 is uniformly distributed with several heating wires or heating plates to provide a heat source and temperature control measures for the inner tube 2. When collecting ammonia and particulate ammonium salts, the temperature is usually controlled between 120℃ and 140℃. The insulation layer 4 is set between the temperature control layer 3 and the inner tube 2, effectively performing the heat conduction and anti-conduction processes. At the same time, it provides limiting support for the several heating wires or heating plates. The temperature control layer 3 can also uniformly distribute multiple thermocouples to detect the temperature at different points in the inner tube 2 and transmit the temperature data of multiple points in the tube to the control unit in real time, so as to realize the real-time acquisition of temperature data of multiple points and precise temperature control. The heat insulation layer 5 is set between the outer tube 1 and the temperature control layer 3, preferably made of glass fiber, asbestos, etc., to reduce heat loss and improve heating uniformity. refer to Figure 1 The control unit of the sampling gun includes a handle 13. A built-in air pump is installed inside the handle 13 near the collection unit. The input end of the built-in air pump is connected to the inner tube 2. The input end of the built-in air pump is connected to at least a direct detection pipe 14 through a pipe. The direct detection pipe 14 is used to transmit the collected ammonia gas. The other end of the direct detection pipe 14 is connected to a laser gas analyzer (not shown in the figure) through a pipe. It is used to directly detect the ammonia gas concentration online. When conducting on-site detection, the pipe of the direct detection pipe 14 is connected to the pipe of the laser gas analyzer. The laser gas analyzer is preferably a tunable semiconductor laser gas detector. It mainly uses tunable semiconductor laser absorption spectroscopy technology to invert the concentration of ammonia gas by measuring the degree of absorption of ammonia molecules by a specific wavelength of laser. The specific principle is not described here. The control unit also includes a built-in data processor and a display screen mounted on the outer surface of the handle 13. The data processor is used for data acquisition and analysis, and the display screen is used to display the measured data and execute control commands, thereby realizing the intelligent use of the sampling and detection device.

[0019] Furthermore, a particle collection unit 12 is connected through and sealed to the collection unit near the handle 13. The inside of the particle collection unit 12 is connected to the inside of the inner tube 2. A filter membrane is installed inside the particle collection unit 12 in a direction perpendicular to the central axis of the inner tube 2. When ammonia and particulate ammonium salt are transported inside the inner tube 2 and pass through the filter membrane, the particulate ammonium salt is trapped on the surface of the filter membrane, and the ammonia continues to be transported through the filter membrane. After the collection process is completed, the filter membrane is removed and eluted, and then ammonium ions are detected by an ion chromatograph.

[0020] refer to Figure 1 as well as Figure 3 In addition to the online detection method for ammonia, an auxiliary frame 16 is installed on the outer surface of the outer tube 1 located between the particle collection section 12 and the handle section 13 via an ear seat. The auxiliary frame 16 has a U-shaped structure and a placement box is fixedly installed on the auxiliary frame 16. The placement box contains an absorption section 18. The absorption liquid of the absorption section 18 uses dilute sulfuric acid to absorb ammonia. Specifically, the absorption section 18 includes at least a first absorption tube 181, a second absorption tube 182, and a third absorption tube 183 arranged in series. The first absorption tube 181, the second absorption tube 182, and the third absorption tube 183 contain sufficient dilute sulfuric acid solution. In addition, a cover can be provided on the top of the placement box. On the one hand, it limits and supports the absorption tubes. On the other hand, the cover and the interior of the placement box form a sealed storage cavity. The sealed storage cavity can be equipped with a heat preservation structure and an ice-water mixture to cool the outside of the absorption bottle with a water bath, improve the solubility of ammonia in the absorption liquid, and ensure full absorption. The input end of the built-in air pump is connected to a collection pipe 15 via a pipeline. The other end of the collection pipe 15 is connected to the inside of the first absorption pipe 181. The first absorption pipe 181 is used to absorb most of the ammonia gas. The second absorption pipe 182 is used to ensure the absorption of the remaining ammonia gas after the first absorption pipe 181 has absorbed most of the ammonia gas. The third absorption pipe 183 is used to prevent the penetration after absorption saturation or to absorb and treat the ammonia gas that is not for detection, and to carry out environmental protection measures for the surrounding environment.

[0021] Furthermore, an early warning tube 19 is detachably installed on the surface of the auxiliary frame 16 adjacent to the third absorption tube 183. The early warning tube 19 is connected to the third absorption tube 183. An indicator is installed inside the early warning tube 19 for early warning of ammonia penetration. The indicator is preferably phenolphthalein. When ammonia that has not been absorbed by the third absorption tube 183 enters the early warning tube 19, the phenolphthalein indicator will change from colorless to red. Since the early warning tube 19 is detachably installed, the indicator will be replaced when the early warning tube 19 is used again after the early warning.

[0022] A first connecting ring 6 and a second connecting ring 7 are respectively connected and sealed at the front end and middle of the collection unit. The first connecting ring 6 and the second connecting ring 7 are sleeved on the outer surface of the outer tube 1, and the second connecting ring 7 is set at the front end of the particle collection unit 12. A first flow pressure gauge 9 and a second flow pressure gauge 10 are respectively installed on the surface of the first connecting ring 6 and the second connecting ring 7. The detection ends of the first flow pressure gauge 9 and the second flow pressure gauge 10 are inserted into the inner tube 2, and the insertion points are respectively recorded as the first pressure detection point and the second pressure detection point. The measured pressure data are respectively recorded as the first pressure value F1 and the second pressure value F2. The first flow pressure gauge 9 and the second flow pressure gauge 10 are connected to the data processor of the control unit. The display screen can retrieve the measured pressure data, namely the first pressure value F1 and the second pressure value F2, in real time.

[0023] refer to Figures 4 to 5 The front end of the first connecting ring 6 is connected to a sampling bend 8 through and sealed. A filter screen is installed at the sampling port of the sampling bend 8 facing the fixed pollution source to prevent large particles of debris from entering the inner tube 2 and to ensure that the tube performs normal collection of ammonia and particulate ammonium salts.

[0024] A hollow tube 11 is installed on the periphery of the front half of the outer tube 1. Specifically, a slide 28 is fixedly connected to the outer ring of the first connecting ring 6 and the second connecting ring 7. A support part 29 is slidably connected inside the slide 28. The hollow tube 11 is supported on the two support parts 29 to realize the installation and connection of the hollow tube 11 on the equipment. The front end of the hollow tube 11 is set towards the sampling port of the sampling bend 8, which can help to clear the sampling port and ensure normal sampling and feeding. The rear port of the hollow tube 11 is sealed to a first auxiliary tube 20 via a flange. A first control valve 21 is installed on the first auxiliary tube 20. A second auxiliary tube 22 is connected to the interior of the second connecting ring 7 and is sealed to it. The port of the second auxiliary tube 22 located inside the second connecting ring 7 passes through the sampling section and communicates with the inner tube 2. A second control valve 23 is installed on the second auxiliary tube 22. The first control valve 21 and the second control valve 23 are signal-connected to the data processor and are used to control the opening degree and the opening and closing state.

[0025] The other ends of the first auxiliary pipe 20 and the second auxiliary pipe 22 are connected to a bidirectional air pump 24 via a three-way pipe. A temperature and humidity sensor 17 is fixedly connected to the bottom of the auxiliary frame 16. The temperature and humidity sensor 17 is connected to the data processing unit for real-time detection and display of the real-time temperature and humidity data of the transmitted gas. The bidirectional air pump 24 is fixedly installed on one side of the outer wall of the temperature and humidity sensor 17. The output end of the bidirectional air pump 24 is connected to a three-way control valve 25 via a pipe. One port of the three-way control valve 25 is connected to a first output pipe 26, which is connected to the detection end of the temperature and humidity sensor 17. The discharge end is connected to an auxiliary recovery pipe 30, and the other end of the auxiliary recovery pipe 30 is connected to a third absorption pipe 183 for recovering the waste gas after temperature and humidity detection, thereby reducing air pollution in the surrounding environment. The other valve port of the three-way control valve 25 is connected to a second output pipe 27, and the other end of the second output pipe 27 is connected to an extraction pipe and an exhaust pipe respectively through a three-way pipe. The extraction pipe and the exhaust pipe are respectively connected to a third control valve and a fourth control valve. The third control valve and the fourth control valve are both connected to the signal of the data processing unit. The extraction pipe is connected to the outside air, and the exhaust pipe is connected to a recovery box. The recovery box is also equipped with an absorption liquid for collecting waste gas.

[0026] In this embodiment, the assembly is completed according to the structure shown in the figure. When the fixed pollution source exhaust gas sampling point is determined, the collection part is extended into the sampling area. The outer tube 1 can be supported and connected to a tripod or manually held to carry out the sampling process. Before formally sampling ammonia and particulate ammonium salts, the temperature and humidity of the sampling area are detected using hollow tube 11. Specifically, the first control valve 21 is opened, the second control valve 23 remains closed, the three-way control valve 25 is adjusted to open the first output pipe 26, and the bidirectional air pump 24 is started in the forward direction for a period of time. The air in the sampling area enters the temperature and humidity sensing unit 17 through hollow tube 11, first auxiliary pipe 20, bidirectional air pump 24, and first output pipe 26. The temperature and humidity sensing unit 17 measures the temperature and humidity data in the sampling area. After the temperature and humidity detection is completed, the waste gas enters the third absorption pipe 183 through auxiliary recovery pipe 30 for waste gas recovery to prevent ammonia and particulate ammonium salts from entering the external environment. After acquiring the temperature and humidity data, the data processor presets the heating temperature and acquisition flow rate of the temperature control layer 3 according to the actual temperature and humidity data to achieve high-efficiency acquisition. The bidirectional air pump 24 is started in the forward direction for a period of time and then turned off.

[0027] During the sampling process, it is necessary to ensure the humidity of ammonia and particulate ammonium salts. Therefore, at the initial sampling, the second control valve 23 is opened, the first control valve 21 is kept closed, the three-way control valve 25 is adjusted to open the first output pipe 26, the bidirectional air pump 24 is started in the forward direction for a period of time, the temperature and humidity sensing unit 17 detects the temperature and humidity data in the inner tube 2, when the measured humidity is consistently higher than the preset humidity within the set time period, the flow rate will be adjusted again to improve the drying effect by reducing the flow rate until the humidity meets the standard. Then, the three-way control valve 25 is adjusted to close the first output pipe 26, the exhaust pipe is opened, and the remaining gas is exhausted and absorbed. After exhausting for a period of time, the bidirectional air pump 24 is closed, and the second control valve 23 is closed; then the built-in air pump is started.

[0028] Based on the preset heating temperature and adjusted collection flow rate, the sampling gun initiates formal sampling by activating the built-in air pump. During sampling, particulate ammonium salts are trapped in the particulate collection section 12. After the collection process is completed, the filter membrane is removed and eluted, and then ammonium ions are detected using an ion chromatograph. Regarding the collection and detection of ammonia: ① Ammonia can be detected online. The input end of the built-in air pump enters the laser gas analyzer through the direct detection pipe 14 for online ammonia detection; ② Ammonia is absorbed into the absorption section 18 through the collection pipe 15. After absorption, the absorption liquid is detected by an ion chromatograph or other detectors to obtain concentration data. Ammonia collection and detection are achieved through the above methods.

[0029] Ammonia gas and particulate ammonium salts are transported into the inner tube 2 through the collection bend 8. The first flow pressure gauge 9 and the second flow pressure gauge 10 respectively perform fixed-point detection of pressure data at the insertion point, and record them as the first pressure value F1. t Second pressure value F2 t ,t is the set detection time point. The data processor draws pressure-time curve fitting graphs based on the collected first pressure value F1 and second pressure value F2, which are denoted as first pressure curve fitting graph L1 and second pressure curve fitting graph L2. First, during a period of time at the beginning of sampling, the average of multiple consecutive pressure values ​​when the derivative approaches 0 is taken from the fitting graph L1 of the first pressure curve, and this average is denoted as the first standard pressure value F1. Z Similarly, based on the fitting graph L2 of the second pressure curve, the average of multiple consecutive pressure values ​​when the derivative approaches 0 is taken and denoted as the second standard pressure value F2. Z And record it in the data processor, when there is no internal blockage, the second standard pressure value F2 Z It should be consistent with the first standard pressure value F1 Z Same or same region; Subsequently, during sampling, the first pressure value F1 was recorded in real time. t Compared with the first standard pressure value F1Z For comparison, the sampling port differential pressure limit is set to... F1, when the first pressure value F1 t Compared with the first standard pressure value F1 Z The actual pressure difference does not exceed the sampling port pressure difference limit. When F1 is reached, it indicates that the sampling port is sampling normally. When the first pressure value F1... t Compared with the first standard pressure value F1 Z The actual pressure difference exceeds the sampling port pressure difference limit. When F1 is selected, it indicates that the sampling port is blocked, resulting in increased internal negative pressure and pressure difference. The sampling port cannot perform sampling normally. Therefore, the data processor controls the first control valve 21 to open, the second control valve 23 to remain closed, the three-way control valve 25 to be adjusted to open the second output pipe 27, the air extraction pipe to open, and the bidirectional air pump 24 to start in reverse for a period of time. External air is sprayed into the sampling port of the collection bend 8 through the front port of the first auxiliary pipe 20 and the hollow pipe 11 to help clear the sampling port and ensure normal collection and feeding. The bidirectional air pump 24 is turned off after starting in reverse for a period of time. Secondly, based on the insertion point spacing L and the adjusted flow velocity q, the pressure measurement time difference T at different insertion points for the same airflow movement point is determined. When comparing the overlap of the first pressure curve fitting graph L1 and the second pressure curve fitting graph L2, F1... t With F2 t-T Comparison, where from F2 t The pressure value can be measured and then compared, when F2 t When a non-zero pressure value can be measured, F1 t It will definitely be able to measure the pressure value; Set | F1 t -F2 t-T |=f, where f is the pressure difference at different insertion points of the same airflow movement point. A pressure limit value fmax is set. When 0≤f≤fmax, it means that the pressure difference inside the inner tube 2 is within the normal pressure range for stable delivery. When f>fmax, it means that the pressure difference inside the inner tube 2 is within the abnormal pressure range, and the airflow cannot be delivered smoothly inside the inner tube 2, resulting in internal stacking and blockage. The data processor will execute an alarm and suspend the sampling process. In addition to determining the presence of internal blockage by testing the pressure difference data at different insertion points from the same airflow movement point, one can also directly and roughly determine the first pressure value F1. t With the second pressure value F2 t The larger the pressure difference, the more severe the internal blockage. The above methods enable intelligent cleaning and alarm functions for abnormal usage of the equipment, achieving integrated sampling and self-inspection and improving the intelligent use of the equipment.

[0030] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features, and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sampling and detection device for waste gas from a stationary pollution source, comprising a sampling gun, the sampling gun comprising a collection section and a control section, the collection section being provided with an outer tube (1), a heat insulation layer (5), a temperature control layer (3), an insulation layer (4), and an inner tube (2) in sequence from the outside to the inside, characterized in that: The control unit includes a handle (13), a built-in data processor, and a display screen mounted on the outer surface of the handle (13). A built-in air pump is installed inside the handle (13) near the acquisition unit. The input end of the built-in air pump is connected to the inner tube (2). The input end of the built-in air pump is connected to at least a direct inspection pipe (14) and / or an acquisition pipe (15) via a pipe. A first connecting ring (6) and a second connecting ring (7) are respectively connected and sealed at the front end and middle of the acquisition unit. The first connecting ring (6) and the second connecting ring (7) are sleeved on the outer surface of the outer tube (1). The surfaces of the first connecting ring (6) and the second connecting ring (7) are... Each of the two surfaces is equipped with a first flow pressure gauge (9) and a second flow pressure gauge (10). The detection ends of the first flow pressure gauge (9) and the second flow pressure gauge (10) are inserted into the inner tube (2). The insertion points are respectively recorded as the first pressure detection point and the second pressure detection point. The measured pressure data are respectively recorded as the first pressure value F1 and the second pressure value F2. The first flow pressure gauge (9) and the second flow pressure gauge (10) are connected to the data processor of the control unit. The front end of the first connecting ring (6) is connected to a sampling bend (8) through and sealed. The front end of the sampling bend (8) is set as a sampling port. A filter screen is installed on the sampling bend (8) facing the sampling port.

2. The stationary pollution source exhaust gas sampling and detection equipment according to claim 1, characterized in that: The particle collection part (12) is connected through and sealed to the collection part near the handle part (13). The inside of the particle collection part (12) is connected to the inside of the inner tube (2). A filter membrane is installed inside the particle collection part (12) in a direction perpendicular to the central axis of the inner tube (2). The second connecting ring (7) is located at the front end of the particle collection part (12).

3. The stationary pollution source exhaust gas sampling and detection equipment according to claim 2, characterized in that: An auxiliary frame (16) is installed on the outer surface of the outer tube (1) located between the particle collection part (12) and the handle part (13) via an ear seat. The auxiliary frame (16) has a U-shaped structure. A placement box is fixedly installed on the auxiliary frame (16). An absorption part (18) is placed inside the placement box. The absorption liquid of the absorption part (18) is dilute sulfuric acid.

4. The stationary pollution source exhaust gas sampling and detection device according to claim 3, characterized in that: The absorption section (18) includes at least a first absorption tube (181), a second absorption tube (182) and a third absorption tube (183) arranged in series, and the other end of the collection pipe (15) is connected to the interior of the first absorption tube (181).

5. The stationary pollution source exhaust gas sampling and detection equipment according to claim 3, characterized in that: The top of the placement box is provided with a cover, which together with the inside of the placement box forms a sealed storage cavity. The sealed storage cavity is provided with a heat insulation structure and an ice-water mixture.

6. The stationary pollution source exhaust gas sampling and detection device according to claim 4, characterized in that: The auxiliary frame (16) is detachably mounted with a warning tube (19) on the surface adjacent to the third absorption tube (183). The warning tube (19) is connected to the third absorption tube (183) and an indicator is provided inside the warning tube (19) for warning of ammonia penetration.

7. The stationary pollution source exhaust gas sampling and detection device according to claim 6, characterized in that: A hollow tube (11) is installed around the front half of the outer tube (1). The front port of the hollow tube (11) is set towards the sampling port of the acquisition bend (8). The rear port of the hollow tube (11) is sealed to a first auxiliary tube (20) through a flange. A first control valve (21) is installed on the first auxiliary tube (20). A second auxiliary tube (22) is connected to the inside of the second connecting ring (7) through and sealed. The port of the second auxiliary tube (22) inside the second connecting ring (7) passes through the sampling part and communicates with the inner tube (2). A second control valve (23) is installed on the second auxiliary tube (22). The first control valve (21) and the second control valve (23) are signal connected to the data processor.

8. The stationary pollution source exhaust gas sampling and detection device according to claim 7, characterized in that: The other ends of the first auxiliary pipe (20) and the second auxiliary pipe (22) are connected to a bidirectional air pump (24) through a three-way pipe. The bottom of the auxiliary frame (16) is fixedly connected to a temperature and humidity sensor (17), which is signal-connected to the data processing unit.

9. The stationary pollution source exhaust gas sampling and detection device according to claim 8, characterized in that: The bidirectional air pump (24) is fixedly installed on one side of the outer wall of the temperature and humidity sensing unit (17). The output end of the bidirectional air pump (24) is connected to a three-way control valve (25) through a pipe. One valve port of the three-way control valve (25) is connected to a first output pipe (26). The first output pipe (26) is connected to the detection end of the temperature and humidity sensing unit (17). The discharge end of the temperature and humidity sensing unit (17) is connected to an auxiliary recovery pipe (30). The other end of the auxiliary recovery pipe (30) is connected to a third absorption pipe (183).

10. A stationary pollution source exhaust gas sampling and detection device according to claim 8, characterized in that: The other port of the three-way control valve (25) is connected to a second output pipe (27). The other end of the second output pipe (27) is connected to an air extraction pipe and an exhaust pipe through a three-way pipe. A third control valve and a fourth control valve are connected to the air extraction pipe and the exhaust pipe, respectively. The third control valve and the fourth control valve are both connected to the data processing unit. The air extraction pipe is connected to the outside air, and the exhaust pipe is connected to a recovery box.

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