Waste gas emission on-line monitoring system and method for chemical automatic production

Abstract

The invention relates to the technical field of chemical engineering detection, and provides a chemical engineering automatic production waste gas emission on-line monitoring system and method.The system comprises a waste gas inlet pipe, a sealing cover, a sample injection pipeline, a cleaning pipeline, an air drying pipeline, a waste liquid pipeline, an air drying airflow circulation pipeline, a valve element module, a filter, a double-probe detection module and a waste gas purification pipe; the valve element module comprises a valve element shell, through holes and a first driving unit, two sets of through holes are symmetrically formed in the side face of the valve element shell, the first driving unit is used for controlling the valve element shell to be rotationally connected into the sealing cover, the filter comprises a filter cover, a radial partition plate, a filling layer and a second driving unit, and the sections of the sealing cover, the valve element shell and the filter cover are all round. The radial partition plates are annularly arrayed in the filter cover, the filling layers are filled in a cavity formed between the two sets of radial partition plates, the second driving unit is used for controlling the filter cover to be rotationally connected into the valve element shell, one through hole only corresponds to one set of filling layers, and the detection precision is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical detection support, in particular to a waste gas emission online monitoring system and method for chemical automatic production. BACKGROUND

[0002] The online monitoring system / device for chemical production is usually installed in high-altitude emission pipelines or narrow spaces (such as pipe corridors), and generally uses optical sensors and electrochemical sensors to detect the particulate matter concentration and gas composition in waste gas respectively. The optical sensor detects based on the light scattering principle through the scattering / attenuation effect of particulate matter on light, which is a non-contact detection, and the electrochemical sensor indirectly evaluates by monitoring the specific gas composition or reaction product adsorbed by particulate matter, which is a contact detection.

[0003] After searching, the existing publication number CN119147346B discloses a waste gas particulate matter concentration emission detection device, relating to the technical field of detection devices, which comprises a detection mechanism and a processing mechanism. The processing mechanism comprises a connecting block, the top of the connecting block is provided with a cover plate, the outer surface of the connecting block is provided with auxiliary optical sensors, one of the inner walls of the rectangular grooves is provided with a first electrically controlled valve, the lower side of the connecting block is provided with a second electrically controlled valve, one side of the connecting block is fixedly provided with a third communication pipe, and the inside of the second cylindrical hole is connected with a rubber ring. This technical solution can know whether the emitted waste gas contains oily substances and remove the oily substances mixed in the waste gas, thereby ensuring the detection effect of the waste gas particulate matter concentration emission detection device, improving the use effect of the waste gas particulate matter concentration emission detection device, and improving the use efficiency of the waste gas particulate matter concentration emission detection device.

[0004] The existing waste gas emission detection device still has the following defects: (1) the sampling pipeline, filter and sensor lens are easy to accumulate dust and block, especially in high-dust working conditions, which need to be manually disassembled and cleaned every week. During the operation, the operator may contact the untreated toxic waste gas (such as VOCs and acidic gas), which poses a safety risk, and the cleaning effect depends on the operator's experience, which may lead to detection drift due to incomplete cleaning; During the multiple sampling and detection processes, the particulate matter deposited on the inside of the filter and the surface of the sensor will affect the next detection, especially the electrochemical sensor which needs to be in contact with the detection. The attachment of solid particles on the electrode surface will directly affect the detection accuracy of the next time. SUMMARY

[0005] The present application relates to the technical field of chemical detection support, in particular to a waste gas emission online monitoring system and method for chemical automatic production.

[0006] To achieve the above object, the present application provides the following technical scheme, a kind of waste gas emission on-line monitoring system of chemical automation production, including waste gas inlet pipe and waste gas purification pipe, still include: Sealing cover Annular array is in the sampling line, cleaning line, air drying line, waste liquid line and air drying airflow circulation line of the side of sealing cover, the sealing cover horizontal side is respectively connected waste gas inlet pipe and waste gas purification pipe by sampling line; Valve core module arranged in sealing cover, the valve core module includes valve core shell, through hole and drive unit one, the valve core shell side is symmetrically provided with two groups of through holes, and the drive unit one is used to control the valve core shell rotationally connected in sealing cover; Filter arranged in valve core shell, the filter includes filter cover, radial partition, filling layer and drive unit two, the sealing cover, valve core shell and filter cover section are circular, the radial partition is annular array in filter cover, the filling layer is filled in the cavity formed between two groups of radial partitions, the drive unit two is used to control the filter cover rotationally connected in valve core shell, and one through hole only corresponds one group of filling layer; Dual-probe detection module located at the axis of filter cover.

[0007] A kind of waste gas emission on-line monitoring method of chemical automation production, comprising: Chemical waste gas passes through waste gas inlet pipe and through hole and enters sealing cover, the filter cover with circular section and the filling layer separated and arranged in annular array are used to pre-filter waste gas, to remove large particle soot in waste gas; Dual-probe detection module is used to detect and analyze pre-filtered waste gas several times, and the waste gas flowing through dual-probe detection module enters waste gas purification pipe after being filtered by filter cover and filling layer; Drive unit one is used to control the valve core shell to rotate preset angle, to align two groups of through holes with cleaning line and waste liquid line respectively, the cleaning liquid sprayed in cleaning line is used to clean filter and dual-probe detection module in central position, and waste liquid after cleaning is discharged through waste liquid line, to prevent waste liquid from polluting sampling line; Drive unit one is used to control the valve core shell to rotate preset angle, to align two groups of through holes with air drying line and air drying airflow circulation line respectively, and drying gas discharged from air drying line is used to dry filter and dual-probe detection module, and the gas after drying is discharged through air drying airflow circulation line, to prevent drying airflow from polluting sampling line The beneficial effects of the present application are as follows: in the detection and analysis of pre-filtered waste gas several times by dual-probe detection module, the dual-probe detection module and filter can be automatically cleaned under the premise of isolating sampling line, to eliminate the interference of residual particulate matter on detection accuracy, with the characteristics of preventing secondary pollution and improving detection accuracy.

[0008] The present application has the characteristics of high detection precision, because the detection precision is reduced by the accumulated pollutants in the filling layer and the pollutants attached to the surface of the optical sensor and the electrochemical sensor are prevented from reducing the detection precision by the automatic switching of the filling layer before each detection and the cleaning of the filling layer and the electrochemical sensor before each detection according to the different detection modes of the optical sensor and the electrochemical sensor. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is a perspective view of the present application.

[0010] Figure 2 It is a front view of the present application.

[0011] Figure 3 It is an exploded view of the present application.

[0012] Figure 4 It is a sectional view of the valve core module and the filter of the embodiment of the present application.

[0013] Figure 5 It is a planar sectional view of the present application.

[0014] Figure 6 It is a sectional view of the present application Figure 5 It is a partial enlarged view at a in the present application.

[0015] Figure 7 It is a transverse sectional view of the filter cleaning of the present application.

[0016] Figure 8 It is a planar sectional view of the air-drying filter of the present application.

[0017] Figure 9 It is a longitudinal sectional view of the present application.

[0018] Figure 10 It is a perspective view of the double-probe detection module of the embodiment of the present application.

[0019] Figure 11 It is a flow chart of the exhaust emission online monitoring method in the present application.

[0020] Figure 12 It is a flow chart of the several times of detection and analysis of the pre-filtered exhaust gas by the double-probe detection module in the present application.

[0021] Reference signs: 1-exhaust inlet pipe; 2-sealing cover; 3-sample inlet pipeline; 4-cleaning pipeline; 5-air-drying pipeline; 6-Valve core module, 61-Valve core housing, 62-Through hole, 63-Central tube, 64-Drive unit one, 65-Sealing ring, 66-End cap; 7-Filter, 71-Filter cover, 72-Radial baffle, 73-Filling layer, 74-Rotating shaft, 75-Drive unit two; 8-Dual probe detection module, 81-Optical sensor, 82-Electrochemical sensor, 83-Differential pressure sensor; 9-Sealing cap assembly, 91-Main sealing cap, 92-Secondary sealing cap; 10- Waste liquid pipeline; 11-Air-drying airflow circulation duct; 12-Exhaust gas purification pipe. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0023] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0024] Please see Figures 1 to 10 In one embodiment of the present invention, an online monitoring system for waste gas emissions from automated chemical production includes a waste gas inlet pipe 1 and a waste gas purification pipe 12. The waste gas inlet pipe 1 is connected to a chemical waste gas emission pipeline, and the waste gas purification pipe 12 is connected to a waste gas purification system. The system also includes: Sealing cover 2; The sealing cover 2 is arranged in a ring on the side of the sample inlet pipe 3, cleaning pipe 4, drying pipe 5, waste liquid pipe 10 and drying airflow circulation pipe 11. The horizontal side of the sealing cover 2 is connected to the waste gas inlet pipe 1 and the waste gas purification pipe 12 through the sample inlet pipe 3. The angle between the axes of the sample inlet pipe 3, cleaning pipe 4, drying pipe 5, waste liquid pipe 10 and drying airflow circulation pipe 11 and the center of the sealing cover 2 is 60 degrees. Solenoid valves and flow meters are installed in the sample inlet pipe 3, cleaning pipe 4 and drying pipe 5. The valve core module 6 is disposed inside the sealing cover 2. The valve core module 6 includes a valve core housing 61, a through hole 62 and a drive unit 64. The valve core housing 61 has two sets of through holes 62 symmetrically arranged on its side. The drive unit 64 is used to control the valve core housing 61 to rotate and connect to the sealing cover 2. The filter 7 is disposed within the valve core housing 61. The filter 7 includes a filter cover 71, radial partitions 72, a rotating shaft 74, a filling layer 73, and a second drive unit 75. The sealing cover 2, the valve core housing 61, and the filter cover 71 all have circular cross-sections. The radial partitions 72 are arranged in a ring array within the filter cover 71. The filling layer 73 fills the cavity formed between the two sets of radial partitions 72. The filter cover 71 is fixedly connected to the rotating shaft 74. The second drive unit 75 is drivenly connected to the rotating shaft 74. The second drive unit 75 is used to control the filter cover 71 to rotate within the valve core housing 61. Each through hole 62 corresponds to only one set of filling layers 73. A dual-probe detection module 8 is located on the axis of the filter hood 71. The dual-probe detection module 8 includes an optical sensor 81, an electrochemical sensor 82, a data fusion processor, and a differential pressure sensor 83. The optical sensor is used to collect the real-time concentration of particulate matter in the exhaust gas, the electrochemical sensor 82 is used to collect the gas composition in the exhaust gas, and the differential pressure sensor 83 is used to monitor the gas flow rate, thereby determining the clogging status of the filter 7. The dual-probe detection module 8 uses the data fusion processor to fuse the real-time concentration data detected by the optical sensor 81 and the component analysis data detected by the electrochemical sensor 82. The data fusion processor is embedded inside the dual-probe detection module 8. A microcontroller (MCU) or microprocessor (MPU) integrates, correlates, and analyzes heterogeneous data from optical sensor 81 (particulate matter concentration and particle size distribution) and electrochemical sensor 82 (gas component concentration) through software algorithms for data preprocessing, feature extraction, and data fusion models. This generates a more comprehensive, accurate, and reliable assessment result of exhaust gas pollution than data from a single sensor. Furthermore, it can indirectly monitor the filter status by combining data from differential pressure sensor 83, thereby enabling comprehensive monitoring of the concentration and particle size distribution in exhaust gas, as well as parameters of toxic components. Since data fusion processors have been widely and maturely applied in existing technologies, they will not be described in detail here.

[0025] Please see Figures 3 to 9 Furthermore, the valve core module 6 also includes a central tube 63, a sealing ring 65, and an end cap 66. The sealing ring 65 is fixedly sleeved on the surface of the valve core housing 61, and the inner wall of the sealing cover 2 slides in contact with the sealing ring 65. The end cap 66 is fixedly connected to one end of the valve core housing 61, and the central tube 63 is fixedly connected to the other end of the valve core housing 61. The central tube 63 and the dual-probe detection module 8 are both connected to the sealing cover 2. The drive unit 64 is drivenly connected to the central tube 63. The dual-probe detection module 8 enters the filter cover 71 through the central tube 63, which has the characteristics of easy disassembly and maintenance.

[0026] Please see Figures 3 to 9Furthermore, it also includes a sealing cover assembly 9, which includes a main sealing cover 91 and a secondary sealing cover 92. The secondary sealing cover 92 is threadedly connected to the main sealing cover 91. The sealing cover 2 is fixedly connected to the main sealing cover 91. The drive unit 75 and the rotating shaft 74 are both connected to the main sealing cover 91. When maintaining the drive unit 75, only the secondary sealing cover 92 needs to be opened. When maintaining the valve core module 6, the main sealing cover 91 needs to be opened. When maintaining the filter 7, the end cover 66 of the valve core housing 61 needs to be opened.

[0027] In this embodiment of the invention, both drive unit 64 and drive unit 75 adopt a worm gear transmission structure. The worm gear drives the filter cover 71 to rotate, so that only one set of filling layer 73 is used for a single detection (the other 5 sets are spares). It can automatically switch to a new filter layer after the optical sensor 81 detects. The cleaning pipeline 4 is used to spray the cleaning liquid obliquely downward. The waste liquid pipeline 10 is used to suction the waste liquid after cleaning under negative pressure. The air drying pipeline 5 sprays the thermal inert gas (nitrogen) obliquely upward. Please see Figure 11 A method for online monitoring of waste gas emissions from automated chemical production, comprising: S100, chemical waste gas enters the sealing cover 2 through the waste gas inlet pipe 1 and through hole 62. The circular filter cover 71 and a set of filling layers 73 arranged in a ring array are used to pre-filter the waste gas to remove large particulate dust in the waste gas. S200. The pre-filtered exhaust gas is detected and analyzed several times using the dual-probe detection module 8. The exhaust gas flowing through the dual-probe detection module 8 enters the exhaust gas purification pipe 12 after being filtered by the filter cover 71 and the filling layer 73. S300, the drive unit 64 controls the valve core housing 61 to rotate by a preset angle (60 degrees) to align the two sets of through holes 62 with the cleaning pipeline 4 and the waste liquid pipeline 10 respectively. The cleaning liquid sprayed out in the cleaning pipeline 4 is used to clean the filter 7 and the dual probe detection module 8 at the center position. The waste liquid after cleaning is discharged through the waste liquid pipeline 10 to prevent the waste liquid from contaminating the sample inlet pipeline 3. S400: The drive unit 64 controls the valve core housing 61 to rotate by a preset angle (60 degrees) to align the two sets of through holes 62 with the air drying pipeline 5 and the air drying airflow circulation pipeline 11 respectively. The drying gas discharged from the air drying pipeline 5 is used to dry the filter 7 and the dual probe detection module 8. The dried gas is discharged through the air drying airflow circulation pipeline 11 to prevent the drying airflow from entering the sample inlet pipeline 3.

[0028] In this embodiment of the invention, when the dual-probe detection module 8 is used to perform several detections and analyses on the pre-filtered exhaust gas, it can automatically clean the dual-probe detection module 8 and the filter 7 under the premise of isolating the sample inlet pipeline 3, so as to eliminate the interference of residual particulate matter on the detection accuracy.

[0029] Please see Figure 12 The steps of using the dual-probe detection module 8 to perform several detections and analyses on the pre-filtered exhaust gas include: S210, When the optical sensor 81 in the dual-probe detection module 8 is turned on separately for detection; S220. After one test is completed, the filter cover 71 is rotated by a preset angle using the drive unit 2 75 to align another set of filling layers 73 with the sample inlet pipe 3. Since the flow rate of the airflow (exhaust gas) at the center of the filter cover 71 is relatively high, the exhaust gas will not diffuse toward the other filling layers 73, so the exhaust gas will not contaminate the other filling layers 73. S230, repeat this cycle several times to achieve different pre-filtration of the filling layer 73 for each exhaust gas detection, in order to improve detection accuracy; S240, when detecting by turning on the electrochemical sensor 82 alone or by turning on the optical sensor 81 and the electrochemical sensor 82 simultaneously; S250. After one test is completed, the valve core housing 61 is rotated by a preset angle using the drive unit 64. The cleaning liquid sprayed from the cleaning pipeline 4 is used to clean the filter 7 and the dual probe detection module 8 at the center position. The valve core housing 61 is rotated by a preset angle using the drive unit 64. The drying gas discharged from the air drying pipeline 5 is used to dry the filter 7 and the dual probe detection module 8. This process is repeated several times, enabling automatic cleaning and drying after each exhaust gas detection, thereby improving detection accuracy.

[0030] In this embodiment of the invention, the optical sensor 81 is a non-contact detection device. By automatically switching the filling layer 73 before each detection, the accumulation of contaminants in the filling layer 73 can be prevented from reducing the detection accuracy. The electrochemical sensor 82 is a contact detection device. By cleaning the filling layer 73 and the electrochemical sensor 82 before each detection, the contaminants attached to the surface of the filling layer 73 and the electrochemical sensor 82 can be prevented from reducing the detection accuracy.

[0031] The cleaning process of the cleaning fluid sprayed from the cleaning pipeline 4 to clean the filter 7 and the dual-probe detection module 8 at the center includes the following steps: S310. Use cleaning pipe 4 to spray cleaning fluid diagonally downwards. S320: The filter cover 71 is controlled by the drive unit 2 75 to perform centrifugal motion at a preset speed. This can not only be used to improve the cleaning effect with the cleaning solution, but also to perform centrifugal dehydration after cleaning, which is convenient for subsequent air drying. S330. Waste liquid is discharged using waste liquid pipeline (10).

[0032] In this embodiment of the invention, when the drying gas discharged from the air drying pipe 5 dries the filter 7 and the dual probe detection module 8, the drive unit 2 75 can also control the filter cover 71 to perform centrifugal motion at a preset speed, which helps to improve the drying efficiency.

[0033] In summary, this application utilizes the dual-probe detection module 8 to perform several detection analyses on the pre-filtered exhaust gas. Under the premise of isolating the sample inlet pipeline 3, it can automatically clean the dual-probe detection module 8 and the filter 7 to eliminate the interference of residual particulate matter on the detection accuracy. It has the characteristics of preventing secondary pollution and improving detection accuracy.

[0034] Based on the different detection methods of the optical sensor 81 and the electrochemical sensor 82, this application can not only prevent the accumulation of contaminants in the filling layer 73 from reducing the detection accuracy by automatically switching the filling layer 73 before each detection, but also prevent contaminants attached to the surface of the filling layer 73 and the electrochemical sensor 82 from reducing the detection accuracy by cleaning the filling layer 73 and the electrochemical sensor 82 before each detection, thus possessing the characteristic of high detection accuracy.

[0035] While several embodiments and examples of the present invention have been described for those skilled in the art, these embodiments and examples are provided as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention.

[0036] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An on-line monitoring system for waste gas emission in automatic chemical production, comprising a waste gas inlet pipe (1) and a waste gas purification pipe (12), characterized in that, Also include: Seal cover (2); Annular array on the side of the seal cover (2) sample inlet pipeline (3), cleaning pipeline (4), air dry pipeline (5), waste liquid pipeline (10) and air dry gas flow circulation pipeline (11), the seal cover (2) horizontal side is connected with exhaust inlet pipe (1) and exhaust gas purification pipe (12) through sample inlet pipeline (3) respectively; Valve core module (6) arranged in the seal cover (2), the valve core module (6) includes valve core shell (61), through hole (62) and drive unit one (64), the valve core shell (61) side is provided with two groups of through holes (62) symmetrically, the drive unit one (64) is used for controlling the valve core shell (61) rotation is connected in the seal cover (2); Filter (7) arranged in the valve core shell (61), the filter (7) includes filter cover (71), radial partition (72), filling layer (73) and drive unit two (75), the seal cover (2), valve core shell (61) and filter cover (71) cross section are circular, the radial partition (72) is annularly arranged in the filter cover (71), the filling layer (73) is filled in the cavity formed between the two groups of radial partitions (72), the drive unit two (75) is used for controlling the filter cover (71) rotation is connected in the valve core shell (61), one through hole (62) corresponds only one group of filling layer (73); Double probe detection module (8) located at the axis of the filter cover (71).

2. The online monitoring system for waste gas emission in automatic chemical production according to claim 1, characterized in that, The double probe detection module (8) includes: Optical sensor (81) for collecting the real-time concentration of particulate matter in exhaust gas; Electrochemical sensor (82) for collecting gas components in exhaust gas; Differential pressure sensor (83) for monitoring gas flow rate, and then for judging the blockage condition of the filter (7).

3. The online monitoring system for waste gas emission in automatic chemical production according to claim 2, characterized in that, The valve core module (6) further includes center tube (63), sealing ring (65) and end cover (66), the sealing ring (65) is fixedly sleeved on the surface of the valve core shell (61), the inner wall of the seal cover (2) is in sliding contact with the sealing ring (65), the end cover (66) is fixedly connected to one end of the valve core shell (61), the other end of the valve core shell (61) is fixedly connected with the center tube (63), the center tube (63) and the double probe detection module (8) are connected with the seal cover (2), the drive unit one (64) is in transmission connection with the center tube (63), and the double probe detection module (8) enters the filter cover (71) from the center tube (63).

4. The online monitoring system for waste gas emission in automatic chemical production according to claim 3, characterized in that, The filter (7) further includes a rotating shaft (74), the filter cover (71) is fixedly connected with the rotating shaft (74), and the drive unit two (75) is in transmission connection with the rotating shaft (74).

5. The online monitoring system for waste gas emission in automatic chemical production according to claim 4, characterized in that, It also includes a sealing cover assembly (9), the sealing cover assembly (9) includes main sealing cover (91) and vice sealing cover (92), the vice sealing cover (92) is in threaded connection with the main sealing cover (91), the seal cover (2) is fixedly connected with the main sealing cover (91), and the drive unit two (75) and the rotating shaft (74) are connected with the main sealing cover (91).

6. The online monitoring system for waste gas emission in automatic chemical production according to claim 1, characterized in that, The included angle of the axis of the sample inlet pipeline (3), the cleaning pipeline (4), the air-drying pipeline (5), the waste liquid pipeline (10) and the air-drying gas flow circulation pipeline (11) with the center of the sealing cover (2) is 60 degrees.

7. The method of claim 1-6, wherein the method is applied to the system of claim 1-6. Comprise: The chemical waste gas enters the sealing cover (2) through the waste gas inlet pipe (1) and the through hole (62), the filter cover (71) with a circular cross section and the ring array separated group of filler layers (73) are used for pre-filtering the waste gas and removing large particles of smoke dust in the waste gas; The pre-filtered waste gas enters the waste gas purification pipe (12) after being filtered by the filter cover (71) and the filler layer (73); The valve core shell (61) is controlled to rotate a preset angle by the driving unit one (64), which is used for aligning the two groups of through holes (62) with the cleaning pipeline (4) and the waste liquid pipeline (10) respectively, the cleaning liquid sprayed in the cleaning pipeline (4) is used for cleaning the filter (7) and the double probe detection module (8) at the center position, and the cleaned waste liquid is discharged through the waste liquid pipeline (10) to prevent the waste liquid from polluting the sample inlet pipeline (3); The valve core shell (61) is controlled to rotate a preset angle by the driving unit one (64), which is used for aligning the two groups of through holes (62) with the air-drying pipeline (5) and the air-drying gas flow circulation pipeline (11) respectively, the drying gas discharged from the air-drying pipeline (5) is used for drying the filter (7) and the double probe detection module (8), and the dried gas is discharged through the air-drying gas flow circulation pipeline (11) to prevent the drying gas flow from entering the sample inlet pipeline (3).

8. The online monitoring method of waste gas emission in automatic chemical production according to claim 7, characterized in that, The step of using the double probe detection module (8) to detect and analyze the pre-filtered waste gas several times comprises: When the optical sensor (81) in the double probe detection module (8) is opened alone for detection; After one detection is completed, the filter cover (71) is controlled to rotate a preset angle by the driving unit two (75), which is used for aligning another group of filler layers (73) with the sample inlet pipeline (3); The cycle is repeated several times to realize that each waste gas detection corresponds to the pre-filtering of different filler layers (73), so as to improve the detection precision; When the electrochemical sensor (82) is opened alone or the optical sensor (81) and the electrochemical sensor (82) are opened simultaneously for detection; After one detection is completed, the valve core shell (61) is controlled to rotate a preset angle by the driving unit one (64), the cleaning liquid sprayed in the cleaning pipeline (4) is used for cleaning the filter (7) and the double probe detection module (8) at the center position, the valve core shell (61) is controlled to rotate a preset angle by the driving unit one (64), and the drying gas discharged from the air-drying pipeline (5) is used for drying the filter (7) and the double probe detection module (8); The cycle is repeated several times to realize the automatic cleaning and drying after each waste gas detection, so as to improve the detection precision.

9. The online monitoring method of waste gas emission in automatic chemical production according to claim 8, characterized in that, The step of cleaning the filter (7) and the double probe detection module (8) at the center position by the cleaning liquid sprayed in the cleaning pipeline (4) comprises: The cleaning liquid is sprayed obliquely downward by the cleaning pipeline (4); The driving unit two (75) is used to control the centrifugal movement of the filter cover (71) at a preset rotating speed, so as to improve the cleaning effect in cooperation with the cleaning liquid. The waste liquid pipeline (10) is used to discharge the waste liquid.

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