CN217332372U

CN217332372U - Torch exhaust emission monitoring system

Info

Publication number: CN217332372U
Application number: CN202220714771.7U
Authority: CN
Inventors: 罗竞天; 孙纪业; 刘虎
Original assignee: NANJING ANALYTICAL INSTRUMENT FACTORY CO Ltd
Current assignee: NANJING ANALYTICAL INSTRUMENT FACTORY CO Ltd
Priority date: 2022-03-30
Filing date: 2022-03-30
Publication date: 2022-08-30
Anticipated expiration: 2032-03-30

Abstract

The utility model provides a torch waste gas emission monitoring system, which is characterized by comprising a sampling device, a pretreatment device, a detection device and a recovery device which are connected in sequence; the sampling device comprises a probe, a first air inlet pipeline, a first filter and a first air outlet pipeline which are connected in sequence, and the pretreatment device comprises a second air inlet pipeline, a pump assembly, a second filter and a second air outlet pipeline which are connected in sequence; the first air outlet pipeline is connected with the second air inlet pipeline, and the second air outlet pipeline is connected with the detection device; the pretreatment device further comprises an adjusting pipeline, an inlet of the adjusting pipeline is connected with an outlet of the second filter, an outlet of the adjusting pipeline is connected with the recovery device, and a first flow adjusting valve is arranged on the adjusting pipeline. The utility model provides a pair of torch exhaust emission monitoring system, the inside waste gas of on-line monitoring torch improves the waste gas sampling process velocity of flow, guarantees the real-time of monitoring to prevent effectively that the pipeline from being blockked up.

Description

Torch waste gas emission monitoring system

Technical Field

The utility model belongs to the technical field of exhaust-gas monitoring, particularly, relate to a torch exhaust emission monitoring system.

Background

In the chemical industry, exhaust gases are generally hazardous. Especially in the exhaust gas discharged from a flare, the exhaust gas may contain a large amount of flammable, toxic, and Highly Reactive Volatile Organic Compounds (HRVOCs). Therefore, there is a need for real-time monitoring and analysis of exhaust gas from chemical production equipment or heavy machinery to reduce emissions and pollution.

The existing monitoring of the waste gas discharged by a torch generally extracts the waste gas by a probe which extends into a discharge pipeline discharged by the torch, a sampling pump is arranged to provide pressure, and the waste gas is conveyed to a detection instrument for detection and analysis. However, the flow rate of the waste gas in the conveying process from the sampling position to the detection instrument is slow, the time is long, and the real-time performance of detection is influenced. The exhaust gas is easy to diffuse in the transmission process, the original state of the exhaust gas is changed, and the detection accuracy is influenced. And moreover, the torch waste gas contains a large amount of particles and moisture, so that the pipeline is easily blocked and corroded, and the detection effect is influenced.

Disclosure of Invention

The utility model is not enough to the aforesaid, a torch exhaust emission monitoring system is provided, the inside waste gas of monitoring torch on line improves the waste gas sampling process velocity of flow, guarantees the real-time of monitoring to prevent effectively that the pipeline from being blockked up.

In order to solve the technical problem, the utility model adopts the following technical scheme:

the utility model provides a torch waste gas emission monitoring system, which comprises a sampling device, a pretreatment device, a detection device and a recovery device which are communicated in sequence; the sampling device comprises a probe, a first air inlet pipeline, a first filter and a first air outlet pipeline which are sequentially communicated, and the pretreatment device comprises a second air inlet pipeline, a pump assembly, a second filter and a second air outlet pipeline which are sequentially communicated; the first air outlet pipeline is communicated with the second air inlet pipeline, and the second air outlet pipeline is communicated with the detection device; the pretreatment device further comprises an adjusting pipeline, an inlet of the adjusting pipeline is communicated with an outlet of the second filter, an outlet of the adjusting pipeline is communicated with the recovery device, and a first flow adjusting valve is arranged on the adjusting pipeline.

As a further improvement, the utility model also comprises a detection calibration device, the detection calibration device is communicated with the detection device.

As a further improvement of the present invention, the detection calibration device includes a third air inlet pipeline, a calibration valve set and a third air outlet pipeline, which are sequentially connected, wherein the calibration valve set is used for switching the on-off between the third air inlet pipeline and the third air outlet pipeline; the third air outlet pipeline is communicated with the detection device.

As a further improvement of the present invention, the calibration valve set includes N sets of valve set units, each set of valve set unit includes a first two-position three-way valve and a second two-position three-way valve, a port B of the first two-position three-way valve is connected with a port C of the second two-position three-way valve, and the port C of the first two-position three-way valve is connected with the recovery device; the port B of the first two-position three-way valve is a common end of the first two-position three-way valve, and the port B of the second two-position three-way valve is a common end of the first two-position three-way valve; and N is an integer greater than or equal to 1.

As a further improvement of the present invention, N is 1; the third air inlet pipeline comprises 1 pipeline, the third air inlet pipeline is connected with a port A of the first two-position three-way valve, the third air outlet pipeline is connected with a port B of the second two-position three-way valve, and the port A of the second two-position three-way valve is connected with the recovery device; the valve group unit is in a normal state that a port B of the first two-position three-way valve is communicated with a port C, and a port A of the second two-position three-way valve is communicated with the port B.

As a further improvement of the present invention, N is 4; the port B of the second two-position three-way valve of the front group of valve group units in the two adjacent groups of valve group units is connected with the port A of the second two-position three-way valve of the rear group of valve group units; the third air inlet pipeline comprises 4 paths, and ports A of the first two-position three-way valves of the 4 groups of valve group units are respectively connected with the 4 paths of third air inlet pipelines in a one-to-one correspondence manner; the port B of the second two-position three-way valve of the last group of valve bank units is connected with a third gas outlet pipeline, and the port A of the second two-position three-way valve of the first group of valve bank units is connected with a recovery device; the normal state of all the valve group units is that the port B of the first two-position three-way valve is communicated with the port C, and the port A of the second two-position three-way valve is communicated with the port B.

As a further improvement, go out through demarcation valves and third between gas pipeline and the detection device and go out gas tube coupling, the second goes out the gas pipeline and is connected with the demarcation valves, and the demarcation valves is used for switching third air inlet pipeline and second and goes out the gas pipeline for third air inlet pipeline or second go out the gas pipeline and go out gas pipeline intercommunication with the third.

As a further improvement of the present invention, the calibration valve set includes N sets of valve set units, each set of valve set unit includes a first two-position three-way valve and a second two-position three-way valve, a port B of the first two-position three-way valve is connected with a port C of the second two-position three-way valve, and the port C of the first two-position three-way valve is connected with the recovery device; and N is an integer greater than or equal to 1.

As a further improvement of the present invention, N is 1; the third air inlet pipeline comprises 1 pipeline, the third air inlet pipeline is connected with a port A of the first two-position three-way valve, the second air outlet pipeline is connected with a port A of the second two-position three-way valve, and the third air outlet pipeline is connected with a port B of the second two-position three-way valve; the valve group unit is in a normal state that a port B of the first two-position three-way valve is communicated with a port C, and a port A of the second two-position three-way valve is communicated with the port B.

As a further improvement of the present invention, N is 4; the port B of the second two-position three-way valve of the front group of valve group units in the two adjacent groups of valve group units is connected with the port A of the second two-position three-way valve of the rear group of valve group units; the third air inlet pipeline comprises 4 paths, and ports A of the first two-position three-way valves of the 4 groups of valve group units are respectively connected with the 4 paths of third air inlet pipelines in a one-to-one correspondence manner; a port B of a second two-position three-way valve of the last group of valve bank units is connected with a third gas outlet pipeline; the second gas outlet pipeline is connected with a port A of a second two-position three-way valve of the first group of valve bank units; the valve group unit connected with the third air inlet pipeline is normally in a state that a port B of the first two-position three-way valve is communicated with a port C, and a port A of the second two-position three-way valve is communicated with the port B; the valve group unit connected with the second air outlet pipeline is in a normal state that a port A of the first two-position three-way valve is communicated with a port B, and a port B of the second two-position three-way valve is communicated with a port C.

As a further improvement of the present invention, N is 5; the port B of the second two-position three-way valve of the front group of valve group units in the two adjacent groups of valve group units is connected with the port A of the second two-position three-way valve of the rear group of valve group units; the third air inlet pipeline comprises 4 pipelines, and the 4 pipelines and the second air outlet pipeline are respectively connected with the ports A of the first two-position three-way valves of the 5 groups of valve group units in a one-to-one correspondence manner; the port B of the second two-position three-way valve of the last group of valve bank units is connected with a third gas outlet pipeline, and the port A of the second two-position three-way valve of the first group of valve bank units is connected with a recovery device; the valve group unit connected with the second gas outlet pipeline is in a normal state that a port A of the first two-position three-way valve is communicated with a port B, and a port B of the second two-position three-way valve is communicated with a port C; the other four groups of valve group units are in a normal state that a port B of a first two-position three-way valve is communicated with a port C, and a port A of a second two-position three-way valve is communicated with the port B.

As a further improvement of the present invention, the detection calibration device further includes a fourth air outlet pipeline and a fourth air inlet pipeline, an inlet of the fourth air outlet pipeline is connected to the calibration valve set, and an outlet of the fourth air outlet pipeline is connected to the first air inlet pipeline; an inlet of the fourth air inlet pipeline is connected with an outlet of the second filter, and an outlet of the fourth air inlet pipeline is connected with the calibration valve group; the calibration valve group is also used for switching the connection and disconnection between the third air inlet pipeline and the fourth air outlet pipeline and the connection and disconnection between the fourth air inlet pipeline and the third air outlet pipeline.

As a further improvement, the utility model also comprises a full system calibration device, which is connected with the first air inlet pipeline.

As a further improvement of the present invention, the sampling device further comprises a housing, the probe is located outside the housing, and the first air inlet pipeline, the first filter and the first air outlet pipeline are all located inside the housing; the outer surface of the shell is provided with an electric heat tracing piece, and the shell is made of heat conducting materials.

As a further improvement, the temperature in the shell is 60-180 ℃.

As a further improvement, the first air inlet and the first air outlet have been seted up on the casing, first air inlet department is equipped with the first piece of blowing, and the first piece of blowing is located outside the casing and blows to the casing.

As a further improvement of the present invention, the pretreatment device further comprises a heat insulation box body, and the second air inlet pipeline, the pump assembly, the second filter, the second air outlet pipeline and the adjusting pipeline are all located in the heat insulation box body; a heater is arranged in the heat preservation box body.

As a further improvement, the temperature in the heat preservation box body is 60-180 ℃.

As a further improvement, the insulation box body is provided with a second air inlet and a second air outlet, the second air inlet is provided with a second air blowing piece, and the second air blowing piece is located outside the insulation box body and blows air to the insulation box body.

As a further improvement of the utility model, the second filter is used for filtering steam or steam and particles in the waste gas.

As a further improvement of the present invention, the pretreatment device further comprises a drainage pipeline, and the drainage pipeline is connected with the second filter; an automatic liquid discharge tank is arranged on the liquid discharge pipeline and comprises a tank body, a liquid inlet is formed in the upper end of the tank body, a liquid outlet is formed in the lower end of the tank body, and an air outlet is formed in the side wall of the tank body; the inlet of the adjusting pipeline is connected with the outlet of the second filter, the inlet of the adjusting pipeline is connected with the exhaust port of the automatic liquid discharging tank, and the liquid inlet of the automatic liquid discharging tank is connected with the outlet of the second filter.

As a further improvement of the present invention, the pump assembly comprises at least one sampling pump.

As a further improvement of the present invention, the pump assembly includes a first sampling pump, a second sampling pump, a first three-way valve and a second three-way valve, a port a of the first three-way valve is connected to the second air inlet pipeline, a port B of the first three-way valve is connected to an inlet of the first sampling pump, a port C of the first three-way valve is connected to an inlet of the second sampling pump, an outlet of the first sampling pump is connected to a port B of the second three-way valve, an outlet of the second sampling pump is connected to a port C of the second three-way valve, and a port a of the second three-way valve is connected to the second filter; the port a of the first three-way valve is the common port of the first three-way valve and the port a of the second three-way valve is the common port of the second three-way valve.

As a further improvement, the parallel connection has a fourth flow control valve on the first sampling pump, the parallel connection has a fifth flow control valve on the second sampling pump.

As a further improvement of the present invention, the recovery device comprises a recovery pipe, a gas pipe, a pressure-compensating pipe, a pressure-supplying pipe and an ejector, wherein the outlet of the recovery pipe is connected with the air suction port of the ejector, the inlet of the gas pipe is connected with the air source, the outlet of the gas pipe is respectively connected with the inlets of the pressure-compensating pipe and the pressure-supplying pipe, the outlet of the pressure-compensating pipe is connected with the recovery pipe, and the outlet of the pressure-supplying pipe is connected with the inlet of the ejector; and a fourth flow regulating valve is arranged on the pressure compensating pipe, and a fifth flow regulating valve is arranged on the pressure supply pipe.

Compared with the prior art, the technical scheme of the utility model following beneficial effect has: the utility model provides a torch exhaust emission monitoring system, sampling device are used for gathering waste gas from torch exhaust duct, and preprocessing device is used for carrying out the preliminary treatment to waste gas, and detection device is used for carrying out the analysis by detection to waste gas, and recovery unit is used for retrieving the waste gas after detecting, realizes the inside waste gas of on-line monitoring torch. The device comprises a sampling device, a pretreatment device, a pre-treatment device and a detection device, wherein the sampling device is internally provided with a first filter for primarily filtering waste gas at the initial sampling stage, the pretreatment device is internally provided with a second filter for filtering the waste gas again, and the two-time filtering improves the filtering effect, prevents a sampling pipeline from being blocked and protects the detection device; a pump assembly is arranged in the pretreatment device to provide power for the flow of the waste gas, improve the flow speed of the waste gas and further improve the detection response speed; the pump assembly is positioned at the front end of the second filter, and the pumping force of the pump assembly is not influenced by the filtering action; an outlet of the second filter is provided with an adjusting pipeline and a second gas outlet pipeline, the second gas outlet pipeline is connected with the detection device, one part of the waste gas pumped and filtered by the pump assembly flows into the adjusting pipeline, the other part of the waste gas flows into the second gas outlet pipeline and then flows into the detection device, and the adjusting pipeline has a flow dividing effect, so that the flow of the waste gas entering the detection device is reduced, the flow rate of the waste gas entering the detection device is increased, the detection response speed is increased, and the real-time performance of monitoring is ensured; the first flow regulating valve is arranged on the regulating pipeline to control the flow split of the regulating pipeline, so that the flow of the waste gas flowing into the detection device is accurately controlled, and the flow requirement of the detection device is met; the waste gas that will adjust the pipeline reposition of redundant personnel inputs recovery unit, does not directly discharge in the atmosphere, reduces the atmosphere pollution, environmental protection more.

Drawings

FIG. 1 is a schematic diagram of a flare exhaust emission monitoring system according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a flare waste gas emission monitoring system according to a first preferred embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a flare waste gas emission monitoring system according to a second preferred embodiment of the present invention;

FIG. 4 is a first preferred construction of the calibration valve block of FIG. 2;

FIG. 5 is a second preferred construction of the calibration valve block of FIG. 2;

FIG. 6 is a first preferred construction of the calibration valve block of FIG. 3;

FIG. 7 is a second preferred construction of the calibration valve block of FIG. 3;

FIG. 8 is a schematic structural diagram of a flare exhaust emission monitoring system according to a third preferred embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a pump assembly in the flare exhaust emission monitoring system of a preferred embodiment of the present invention;

fig. 10 is a schematic view of the recycling apparatus of fig. 1.

The figure shows that: 11 a first air inlet pipeline, 12 a first filter, 13 a first air outlet pipeline, 21 a second air inlet pipeline, 22 a pump assembly, 23 a second filter, 24 a second air outlet pipeline, 25 a regulating pipeline, 251 a first flow regulating valve, 31 a third air inlet pipeline, 32 a calibration valve group, 321 a first two-position three-way valve, 322 a second two-position three-way valve, 33 a third air outlet pipeline, 26 a liquid discharge pipeline, 27 an automatic liquid discharge tank, 221 a first sampling pump, 222 a second sampling pump, 223 a first three-way valve, 224 a second three-way valve, 4 a recovery device, 41 a recovery pipe, 42 an air conveying pipe, 43 a pressure compensating pipe, 44 a pressure supply pipe, 45 an ejector, 431 a fourth flow regulating valve and 441 a fifth flow regulating valve.

Detailed Description

The technical solution of the present invention will be described in detail with reference to the accompanying drawings.

The following description is merely exemplary in nature and is not intended to limit the present disclosure, application, or uses. It should be understood that throughout the drawings, corresponding reference numerals indicate like or corresponding parts and features.

An embodiment of the utility model provides a torch exhaust emission monitoring system, as shown in FIG. 1, including sampling device, preprocessing device, detection device 3 and the recovery unit 4 that communicate in proper order. The sampling device comprises a probe, a first air inlet pipeline 11, a first filter 12 and a first air outlet pipeline 13 which are sequentially communicated, and the preprocessing device comprises a second air inlet pipeline 21, a pump assembly 22, a second filter 23 and a second air outlet pipeline 24 which are sequentially communicated. The first outlet duct 13 communicates with the second inlet duct 21 and the second outlet duct 24 communicates with the detection device 3. The pretreatment device further comprises an adjusting pipeline 25, an inlet of the adjusting pipeline 25 is communicated with an outlet of the second filter 23, an outlet of the adjusting pipeline 25 is communicated with the recovery device 4, and a first flow adjusting valve 251 is arranged on the adjusting pipeline 25. In consideration of the number of types of detection gas, detection accuracy, and cost, it is preferable that the detection device 3 employ a chromatograph.

The working flow of the monitoring system of the above embodiment is as follows:

the first flow regulating valve 251 is adjusted according to the flow requirement of the detection device. The pump assembly 22 is started, the exhaust gas rapidly enters the first air inlet pipeline 11 under the suction effect of the pump assembly 22, the first filter 12 filters the exhaust gas through the first filter 12, the exhaust gas sequentially passes through the first air outlet pipeline 13, the second air inlet pipeline 21 and the pump assembly 22 to reach the second filter 23, the second filter 23 filters the exhaust gas again, under the effect of the first flow regulating valve 251, a proper amount of exhaust gas flows into the regulating pipeline 25, and the rest of the exhaust gas flows into the second air outlet pipeline 24 and then flows into the detection device 3. The detection device 3 detects and analyzes the waste gas, the waste gas flows into the recovery device 4 after detection, and the recovery device 4 recovers the waste gas.

The torch exhaust emission monitoring system of this embodiment, sampling device 1 are used for gathering waste gas from torch exhaust pipeline, and preprocessing device 2 is used for carrying out the preliminary treatment to waste gas, and detection device 3 is used for carrying out the analysis by detection to waste gas, and recovery unit 4 is used for retrieving the waste gas after detecting, realizes the inside waste gas of on-line monitoring torch. Wherein, set up first filter 12 in sampling device 1 for carry out prefiltering to waste gas at the sampling initial stage, set up second filter 23 in preprocessing device 2, be used for filtering waste gas once more, through twice filtration, improve the filter effect, prevent that the sample pipeline from being blockked up, protection check out test set. A pump assembly 22 is provided in the pre-treatment device to provide power to the exhaust flow, increasing the exhaust flow rate and thus the detection response speed. The pump assembly 22 is located at the front end of the second filter 23, the pumping force of the pump assembly being unaffected by the filtering. Set up at the export of second filter 23 and adjust pipeline 25 and second and go out gas pipeline 24, second is gone out gas pipeline 24 and is connected with detection device 3, partly inflow of the waste gas after the pumping filtration of pump package spare is adjusted pipeline 25, another part flows into second and goes out gas pipeline 24 and then flows into detection device 3, it plays the reposition of redundant personnel effect to adjust pipeline 25, make the waste gas flow who gets into detection device 3 reduce, improve the velocity of flow that waste gas got into detection device 3, then improve and detect response speed, guarantee the real-time of monitoring. By providing the first flow regulating valve 251 on the regulating pipeline 25, the flow rate of the exhaust gas flowing into the regulating pipeline 25 is controlled, and then the flow rate of the exhaust gas flowing into the detecting device 3 is accurately controlled, so that the flow rate requirement of the detecting device is met. The waste gas shunted by the adjusting pipeline 25 is input into the recovery device 4 and is not directly discharged into the atmosphere, so that the atmospheric pollution is reduced, and the environment is protected.

As a preferred example, the flare waste gas emission monitoring system further comprises a detection calibration device, and the detection calibration device is communicated with the detection device 3. After the detection device 3 operates for a certain time, the detection device 3 can be calibrated through the detection calibration device, and the detection precision of the detection device is improved.

The structure that detects calibration device has the multiple, the utility model provides two kinds of preferred structures that detect calibration device.

In a first preferred structure, as shown in fig. 2, the detection calibration device includes a third air inlet pipeline 31, a calibration valve set 32, and a third air outlet pipeline 33, which are sequentially communicated, where the calibration valve set 32 is used to switch on/off between the third air inlet pipeline 31 and the third air outlet pipeline 33. The third outlet line 33 communicates with the detection means 3.

In the preferred embodiment, the third air inlet pipeline 31 is used for inputting a calibration gas, and the calibration valve set 32 is used for switching on and off between the third air inlet pipeline 31 and the third air outlet pipeline 33. During normal monitoring, the calibration valve set 32 is closed, so that the third air inlet pipeline 31 is not communicated with the third air outlet pipeline 33. When the detection device 3 needs to be calibrated, the waste gas is stopped from being introduced into the detection device 3, the calibration valve group 32 is switched to enable the third air inlet pipeline 31 and the third air outlet pipeline 33 to be communicated, the calibration gas enters the detection device 3 through the third air inlet pipeline 31, the calibration valve group 32 and the third air outlet pipeline 33 in sequence, and the detection device 3 is calibrated.

Preferably, the calibration valve set 33 includes N sets of valve set units, where N is an integer greater than or equal to 1. Each group of valve group units comprises a first two-position three-way valve 321 and a second two-position three-way valve 322, a port B of the first two-position three-way valve is connected with a port C of the second two-position three-way valve, and the port C of the first two-position three-way valve is connected with the recovery device 4. In this preferred embodiment, each group of valve bank units includes two-position three-way valves, the two-position three-way valves are connected in series, and the two-position three-way valves of the same valve bank unit are switched simultaneously to control the connection and disconnection between the third air inlet pipeline 31 and the third air outlet pipeline 33. The port C of the first two-position three-way valve of each group of valve unit is connected with the recovery device 4, so that residual gas generated in the valve unit when the valve unit is switched or leaked gas generated due to poor sealing performance after long-term use can be conveyed to the recovery device 4, and the gas is not directly discharged to the atmosphere, so that the valve unit is more environment-friendly.

Preferably, N is 1, i.e., the calibration valve set 32 includes 1 set of valve set units. As shown in fig. 4, the third air inlet pipeline 31 has 1 pipeline, the third air inlet pipeline 31 is connected with the port a of the first two-position three-way valve 331, the third air outlet pipeline 33 is connected with the port B of the second two-position three-way valve 332, and the port a of the second two-position three-way valve 332 is connected with the recycling device 4.

In the preferred embodiment, the on-off between the third air inlet pipeline 31 and the third air outlet pipeline 33 is controlled by switching a group of valve group units, so that the structure is simple and the control is convenient. The valve group unit is normally provided with a port B of the first two-position three-way valve communicated with a port C, and a port A of the second two-position three-way valve communicated with the port B. During normal monitoring, the exhaust gas flows into the detection device 3 through the probe, the first inlet pipeline 11, the first filter 12, the first outlet pipeline 13, the second inlet pipeline 21, the pump assembly 22, the second filter 23 and the second outlet pipeline 24, and the detection device 3 performs detection analysis. During calibration, the input of exhaust gas to the detection device 3 is stopped, the first two-position three-way valve is switched to be communicated with the port A and the port B, and the second two-position three-way valve is switched to be communicated with the port B and the port C. The standard gas flows into the detection device 3 through the third gas inlet pipeline 31, the port a and the port B of the first two-position three-way valve, the port C and the port B of the second two-position three-way valve, and the third gas outlet pipeline 33 in sequence, and the detection device 3 performs calibration. The port C of the first two-position three-way valve and the port A of the second two-position three-way valve of the valve group unit are both connected with the recovery device 4, and when leakage occurs inside the valve group, gas can flow into the recovery device 4 from the port C of the first two-position three-way valve. When the valve bank unit is switched to a normal state from the calibration state, the standard gas in the valve bank can flow into the recovery device 4 from the port C of the first two-position three-way valve and the port a of the second two-position three-way valve. Not directly discharged to the atmosphere, thereby being more environment-friendly.

Preferably, N is 4, i.e., the calibration valve set 32 includes 4 sets of valve set units. As shown in fig. 5, a port B of the second two-position three-way valve of the previous group of valve group units in the two adjacent groups of valve group units is connected to a port a of the second two-position three-way valve of the next group of valve group units. The third air inlet pipeline 31 has 4 paths, and the ports a of the first two-position three-way valve of the 4 groups of valve group units are respectively connected with the 4 paths of third air inlet pipelines 31 in a one-to-one correspondence manner. The port B of the second two-position three-way valve of the last group of valve bank units is connected with the third gas outlet pipeline 33, and the port a of the second two-position three-way valve of the first group of valve bank units is connected with the recovery device 4.

In this preferred embodiment, the 4 third air inlet pipelines 31 are respectively used for inputting high-concentration standard air, medium-concentration standard air, low-concentration standard air and conventional-concentration standard air, and the 4 third air inlet pipelines 31 are respectively communicated with the third air outlet pipeline 33 by switching and controlling the 4 valve units, so that automatic input calibration of the 4 concentration standard air is realized, calibration is performed without manually replacing the standard air, and the control is convenient. The normal state of each group of valve group units is that a port B of a first two-position three-way valve is communicated with a port C, and a port A of a second two-position three-way valve is communicated with the port B. During normal monitoring, the exhaust gas flows into the detection device 3 through the probe, the first inlet pipeline 11, the first filter 12, the first outlet pipeline 13, the second inlet pipeline 21, the pump assembly 22, the second filter 23 and the second outlet pipeline 24, and the detection device 3 performs detection analysis. And during calibration, the waste gas input into the detection device is stopped, the first two-position three-way valve of the valve group unit connected with the third gas inlet pipeline for inputting the first concentration standard gas is switched to be communicated with the port A and the port B, and the second two-position three-way valve is switched to be communicated with the port B and the port C. The first concentration standard gas flows into the detection device 3 through the third gas inlet pipeline 31, the port a and the port B of the first two-position three-way valve, the port C and the port B of the second two-position three-way valve, the port a and the port B of the second two-position three-way valve of the valve bank unit located at the downstream of the valve bank unit, and the third gas outlet pipeline 33 in sequence, and the detection device 3 performs calibration. After the concentration standard gas calibration is finished, the corresponding valve group unit returns to the normal state. And the four groups of valve group units are sequentially switched to calibrate the four concentration standard gases. The port C of the first two-position three-way valve of each valve group unit and the port A of the second two-position three-way valve of the first valve group unit are both connected with the recovery device 4, and when leakage occurs inside the valve group, gas can flow into the recovery device 4 from the port C of the first two-position three-way valve. When the valve bank unit is switched from the calibration state to the normal state, the standard gas in the valve bank can flow into the recovery device 4 from the port C of the first two-position three-way valve and the port a of the second two-position three-way valve of the first valve bank unit. Not directly discharged to the atmosphere, thereby being more environment-friendly.

In a second preferred structure, as shown in fig. 3, the detection calibration device includes a third air inlet pipeline 31, a calibration valve set 32, and a third air outlet pipeline 33, which are connected in sequence, where the calibration valve set 32 is used to switch on/off between the third air inlet pipeline 31 and the third air outlet pipeline 33. The third outlet line 33 is connected to the detection device 3. The second air outlet pipeline 24 is connected with the detection device 3 through a calibration valve group 32 and a third air outlet pipeline 33, the second air outlet pipeline 24 is connected with the calibration valve group 32, and the calibration valve group 32 is used for switching the third air inlet pipeline 31 and the second air outlet pipeline 24, so that the third air inlet pipeline 31 or the second air outlet pipeline 24 is communicated with the third air outlet pipeline 33.

In the preferred embodiment, the second air outlet pipeline 24 is not directly connected to the detection device 3, but connected to the calibration valve set 32, and the calibration valve set 32 switches the third air inlet pipeline 31 or the second air outlet pipeline 24 to communicate with the third air outlet pipeline 33, i.e. the waste gas or the standard gas is switched to enter the detection device, the switching between the monitoring state and the calibration state is realized only by switching the calibration valve set 32, the on-off between the second air outlet pipeline 24 and the detection device 3 does not need to be controlled independently, and the control is simple.

During normal monitoring, the calibration valve group 32 is switched to enable the second air outlet pipeline 24 and the third air outlet pipeline 33 to be communicated, waste gas sequentially passes through the probe, the first air inlet pipeline 11, the first filter 12, the first air outlet pipeline 13, the second air inlet pipeline 21, the pump assembly 22, the second filter 23, the second air outlet pipeline 24, the calibration valve group 32 and the third air outlet pipeline 33 and enters the detection device 3, and the detection device 3 performs detection and analysis. When the detection device 3 needs to be calibrated, the calibration valve group 32 is switched to enable the third air inlet pipeline 31 and the third air outlet pipeline 33 to be communicated, the calibration air sequentially enters the detection device 3 through the third air inlet pipeline 31, the calibration valve group 32 and the third air outlet pipeline 33, and the detection device 3 is calibrated.

Preferably, the calibration valve group comprises N groups of valve group units, wherein N is an integer greater than or equal to 1. Each group of valve group units comprises a first two-position three-way valve 321 and a second two-position three-way valve 322, a port B of the first two-position three-way valve is connected with a port C of the second two-position three-way valve, and the port C of the first two-position three-way valve is connected with the recovery device 4. In this preferred embodiment, each group of valve bank units includes two-position three-way valves, the two-position three-way valves are connected in series, and the two-position three-way valves of the same valve bank unit are switched simultaneously to control the connection and disconnection between the second air outlet pipeline 24 or the third air inlet pipeline 31 and the third air outlet pipeline 33. The port C of the first two-position three-way valve of each group of valve group unit is connected with the recovery device 4, so that residual gas generated in the valve group during switching of the valve group or leaked gas generated due to poor sealing performance after long-term use can be conveyed to the recovery device 4, and the gas is not directly discharged to the atmosphere, so that the valve group is more environment-friendly.

Preferably, N is 1, i.e. the calibration valve set comprises 1 set of valve set units. The third air inlet pipeline has 1 pipeline, the third air inlet pipeline 31 is connected with a port a of the first two-position three-way valve, the second air outlet pipeline 24 is connected with a port a of the second two-position three-way valve, and the third air outlet pipeline 33 is connected with a port B of the second two-position three-way valve.

In the preferred embodiment, the second air outlet pipeline 24 and the third air inlet pipeline 31 are connected to the same group of valve group units, and the on-off between the second air outlet pipeline 24 and the third air inlet pipeline 31 and the third air outlet pipeline 33 is controlled by switching the group of valve group units, so that the structure is simple and the control is convenient. The valve group unit is in a normal state that a port B of the first two-position three-way valve is communicated with a port C, and a port A of the second two-position three-way valve is communicated with the port B. During normal monitoring, the exhaust gas flows into the detection device 3 through the probe, the first air inlet pipeline 11, the first filter 12, the first air outlet pipeline 13, the second air inlet pipeline 21, the pump assembly 22, the second filter 23, the second air outlet pipeline 24, the port a and the port B of the second two-position three-way valve, and the third air outlet pipeline 33, and the detection device 3 performs detection analysis. During calibration, the first two-position three-way valve is switched to be communicated with the port A and the port B, and the second two-position three-way valve is switched to be communicated with the port B and the port C. The standard gas flows into the detection device 3 through the third gas inlet pipeline 31, the port a and the port B of the first two-position three-way valve, the port C and the port B of the second two-position three-way valve, and the third gas outlet pipeline 33 in sequence, and the detection device 3 performs calibration. The port C of the first two-position three-way valve of the valve bank unit is connected with the recovery device 4, and when leakage occurs inside the valve bank, gas can flow into the recovery device 4 from the port C of the first two-position three-way valve. When the valve bank unit is switched from the calibration state to the normal state, the standard gas in the valve bank can flow into the recovery device 4 from the port C of the first two-position three-way valve. Not directly discharged to the atmosphere, thereby being more environment-friendly.

Preferably, N is 4, i.e. the calibration valve group comprises 4 groups of valve group units. As shown in fig. 6, a port B of the second two-position three-way valve of the previous group of valve group units in the two adjacent groups of valve group units is connected to a port a of the second two-position three-way valve of the next group of valve group units. The third air inlet pipeline 31 has 4 paths, and the ports a of the first two-position three-way valve of the 4 groups of valve group units are respectively connected with the 4 paths of third air inlet pipelines 31 in a one-to-one correspondence manner. The port B of the second two-position three-way valve of the last group of valve bank units is connected with the third gas outlet pipeline 33, and the second gas outlet pipeline 24 is connected with the port a of the second two-position three-way valve of the first group of valve bank units.

In the preferred embodiment, the 4 third air inlet pipelines 31 are respectively used for inputting high-concentration standard air, medium-concentration standard air, low-concentration standard air and conventional-concentration standard air, and the 4 third air inlet pipelines 31 and the 4 second air outlet pipelines 24 are respectively communicated with the third air outlet pipeline 33 through switching control of the 4 valve group units, so that automatic input of waste gas and 4 standard air is realized, calibration is performed without manual standard air replacement, and the control is convenient. The normal state of each group of valve group units is that a port B of a first two-position three-way valve is communicated with a port C, and a port A of a second two-position three-way valve is communicated with the port B. During normal monitoring, the exhaust gas flows into the detection device 3 through the probe, the first inlet pipeline 11, the first filter 12, the first outlet pipeline 13, the second inlet pipeline 21, the pump assembly 22, the second filter 23, the second outlet pipeline 24, the ports a and B of the second two-position three-way valve of the first group of valve bank units, the ports a and B of the second two-position three-way valve of the second group of valve bank units, the ports a and B of the second two-position three-way valve of the third group of valve bank units, the ports a and B of the second two-position three-way valve of the fourth group of valve bank units, and the third outlet pipeline 33, and the detection device 3 performs detection analysis. During calibration, a first two-position three-way valve of the valve group unit connected with a third air inlet pipeline for inputting the first concentration standard air is switched to be communicated with a port A and a port B, and a second two-position three-way valve is switched to be communicated with a port B and a port C. The first concentration standard gas flows into the detection device 3 through the third gas inlet pipeline 31, the port a and the port B of the first two-position three-way valve, the port C and the port B of the second two-position three-way valve, the port a and the port B of the second two-position three-way valve of the valve bank unit located at the downstream of the valve bank unit, and the third gas outlet pipeline 33 in sequence, and the detection device 3 performs calibration. After the concentration standard gas calibration is finished, the corresponding valve group unit returns to the normal state. And the four groups of valve group units are sequentially switched to calibrate the four concentration standard gases. The port C of the first two-position three-way valve of each valve group unit is connected with the recovery device 4, and when leakage occurs inside the valve group, gas can flow into the recovery device 4 from the port C of the first two-position three-way valve. When the valve bank unit is switched from the calibration state to the normal state, the standard gas in the valve bank can flow into the recovery device 4 from the port C of the first two-position three-way valve. Not directly discharged to the atmosphere, thereby being more environment-friendly.

Preferably, N is 5, i.e. the calibration valve group comprises 5 groups of valve group units. As shown in fig. 7, a port B of the second two-position three-way valve of the previous group of valve group units in the two adjacent groups of valve group units is connected to a port a of the second two-position three-way valve of the next group of valve group units. The third air inlet pipeline 31 has 4 pipelines, and the 4 pipelines of the third air inlet pipeline 31 and the second air outlet pipeline 24 are respectively connected with the ports a of the first two-position three-way valves of the 5 groups of valve group units in a one-to-one correspondence manner. The port B of the second two-position three-way valve of the last group of valve bank units is connected with the third gas outlet pipeline 33, and the port a of the second two-position three-way valve of the first group of valve bank units is connected with the recovery device 4.

In the preferred embodiment, the 4 third air inlet pipelines 31 are respectively used for inputting high-concentration standard gas, medium-concentration standard gas, low-concentration standard gas and conventional-concentration standard gas, and the second air outlet pipeline 24 and the 4 third air inlet pipelines 31 are in one-to-one correspondence with the 5 valve group units. Through 4 groups of valve group units, the 4 third air inlet pipelines 31 are switched and controlled to be communicated with the third air outlet pipelines 33 respectively, so that the automatic input calibration of 4 kinds of concentration standard air is realized, the standard air is not required to be manually replaced for calibration, and the second air outlet pipelines 24 are controlled to be communicated with the third air outlet pipelines 33 through 1 group of valve group units, so that the control is convenient. The normal state of the valve group unit connected with the second gas outlet pipeline 24 is that the port a of the first two-position three-way valve is communicated with the port B, the port B of the second two-position three-way valve is communicated with the port C, the normal state of the other valve group units is that the port B of the first two-position three-way valve is communicated with the port C, and the port a of the second two-position three-way valve is communicated with the port B. During normal monitoring, exhaust gas flows into the detection device 3 through the probe, the first air inlet pipeline 11, the first filter 12, the first air outlet pipeline 13, the second air inlet pipeline 21, the pump assembly 22, the second filter 23, the second air outlet pipeline 24, the port a and the port B of the first two-position three-way valve of the valve bank unit connected with the second air outlet pipeline 24, the port C and the port B of the second two-position three-way valve, the port a and the port B of the second two-position three-way valve of the valve bank unit located at the downstream of the valve bank unit, and the third air outlet pipeline 33, and the detection device 3 performs detection and analysis. During calibration, a first two-position three-way valve of the valve group unit connected with the second air outlet pipeline 24 is switched to be communicated with a port B and a port C, a second two-position three-way valve is switched to be communicated with the port A and the port B, a first two-position three-way valve of the valve group unit connected with a third air inlet pipeline for inputting the first concentration standard air is switched to be communicated with the port A and the port B, and a second two-position three-way valve is switched to be communicated with the port B and the port C. The first concentration standard gas flows into the detection device 3 through the third gas inlet pipeline 31, the port a and the port B of the first two-position three-way valve of the valve group unit connected with the third gas inlet pipeline for inputting the standard gas, the port C and the port B of the second two-position three-way valve, the port a and the port B of the second two-position three-way valve of the valve group unit located at the downstream of the valve group unit, and the third gas outlet pipeline 33 in sequence, and the detection device 3 performs calibration. After the concentration standard gas calibration is finished, the corresponding valve group unit is recovered to be a normal state. And the four groups of valve group units are sequentially switched to calibrate the four concentration standard gases. The port C of the first two-position three-way valve of each valve group unit and the port A of the second two-position three-way valve of the first valve group unit are both connected with the recovery device 4, and when leakage occurs inside the valve group, gas can flow into the recovery device 4 from the port C of the first two-position three-way valve. When the valve bank is switched from the calibration state to the normal state, the calibration gas in the valve bank can flow into the recovery device 4 from the port C of the first two-position three-way valve and the port a of the second two-position three-way valve of the first group of valve bank units. Not directly discharged to the atmosphere, thereby being more environment-friendly.

Preferably, the valve group unit is integrated into a modular structure, and the calibration valve group is formed by assembling at least one valve group unit. The valve group units are modularized, the valve group units are connected in an assembling mode, the size of the whole calibration valve group is reduced, the valve group units can be increased or decreased conveniently according to practical application scenes, and the valve group calibration device is flexible to use.

As a preferred example, the detection calibration device further includes a fourth air outlet pipeline and a fourth air inlet pipeline, an inlet of the fourth air outlet pipeline is connected to the calibration valve group 32, and an outlet of the fourth air outlet pipeline is connected to the first air inlet pipeline 11. The inlet of the fourth inlet line is connected to the outlet of the second filter 23, and the outlet of the fourth inlet line is connected to the calibration valve set 32. The calibration valve set 32 is further configured to switch between the third air inlet pipeline 31 and the fourth air outlet pipeline, and between the fourth air inlet pipeline and the third air outlet pipeline 33.

The detection calibration device of the preferred embodiment can be used for calibrating the detection device and can also be used for carrying out full-system calibration on the whole monitoring system. When the whole system calibration is carried out, the standard gas is input into the sampling device through the third gas inlet pipeline, the calibration valve group and the fourth gas outlet pipeline in sequence, and then flows into the detection device through the first gas inlet pipeline 11, the first filter 12, the first gas outlet pipeline 13, the second gas inlet pipeline 21, the pump assembly 22, the second filter 23, the fourth gas inlet pipeline, the calibration valve group and the third gas outlet pipeline 33 in sequence, so that the integrity, the response time, the connection condition among components and the gas tightness of the pipelines of the whole monitoring system are detected, and the detection precision and the safety of the monitoring system are improved.

As a preferred example, the monitoring system further includes a full-system calibration device, and the full-system calibration device is connected to the first air intake pipeline. The whole system calibration device inputs the calibration gas from the front end of the sampling device, can perform whole system calibration on the whole monitoring system, detects the integrity, the response time, the connection condition among components and the air tightness of a detection pipeline of the system, and improves the detection precision and the safety of the monitoring system.

Preferably, the sampling device further comprises a housing, the probe is located outside the housing, and the first inlet pipeline 11, the first filter 12 and the first outlet pipeline 13 are located inside the housing. The outer surface of the shell is provided with an electric tracing band, and the shell is made of heat conducting materials. This preferred embodiment, with first inlet line 11, first filter 12 and first outlet line 13 setting in the casing, the electric tracing area generates heat, inside through casing heat conduction heating casing to control the temperature to casing inside, make the waste gas temperature can not be lower when taking a sample, guarantee that waste gas composition and state do not change, improve and detect the precision.

Preferably, the temperature in the shell is 60-180 ℃. The waste gas is in the environment with the temperature range of 60-180 ℃ after being sampled, so that the components and the state of the waste gas are ensured not to change, and the detection precision is improved.

Preferably, the shell is provided with a first air inlet and a first air outlet, the first air inlet is provided with a first blowing piece, and the first blowing piece is located outside the shell and blows air into the shell. In the preferred embodiment, the first blowing piece blows air into the shell, the air outlet exhausts air, micro-positive pressure in the shell is achieved, and the explosion-proof performance is improved. Meanwhile, the air flow in the shell is flowed and replaced by blowing and exhausting, if slight waste gas leaks in the shell, the leaked waste gas can be replaced out of the shell, and the safety performance is improved.

As a preferred example, the pretreatment device further comprises a heat preservation box, and the second air inlet pipeline 21, the pump assembly 22, the second filter 23, the second air outlet pipeline 24 and the adjusting pipeline 25 are all located in the heat preservation box. The heat preservation box body is internally provided with a heater. In the preferred embodiment, the second air inlet pipeline 21, the pump assembly 22, the second filter 23, the second air outlet pipeline 24 and the adjusting pipeline 25 are arranged in the heat preservation box body, so that the temperature is convenient to control, meanwhile, the length of the flow path is reduced, and the maintenance is also convenient. The heater directly heats the interior of the heat preservation box body, and the temperature of the interior of the heat preservation box body is controlled, so that the temperature of waste gas in the transmission process is not low, the composition and the state of the waste gas are not changed, and the detection precision is improved.

Preferably, the temperature in the heat-preservation box body is 60-180 ℃. The waste gas is in the environment with the temperature range of 60-180 ℃ in the transmission process, so that the components and the state of the waste gas are not changed, and the detection precision is improved.

Preferably, the insulation box body is provided with a second air inlet and a second air outlet, the second air inlet is provided with a second air blowing piece, and the second air blowing piece is located outside the insulation box body and blows air into the insulation box body. In the preferred embodiment, the second blowing piece blows air into the heat insulation box body, and the air outlet exhausts air, so that micro-positive pressure in the heat insulation box body is realized, and the explosion-proof performance is improved. Meanwhile, the air flow in the insulation box body is flowed and replaced by blowing and exhausting, if slight waste gas leaks in the insulation box body, the leaked waste gas can be replaced out of the insulation box body, and the safety performance is improved.

As a preferred example, the second filter 23 is used to filter moisture or moisture and particulates in the exhaust gas. The second filter 23 in the preferred embodiment can filter out moisture in the exhaust gas or can filter out both moisture and particles, thereby effectively preventing the sampling pipeline from being blocked, preventing the pipeline from being corroded, and protecting the detection equipment. If the second filter is used only for filtering water vapor, the second filter may employ a gas-liquid separator. If the second filter is used for filtering moisture and particles, the second filter may be an adsorption type filter element.

Preferably, as shown in fig. 8, the pretreatment device further comprises a drain line 26, and the drain line 26 is connected to the second filter 23. An automatic liquid discharge tank 27 is arranged on the liquid discharge pipeline 26, the automatic liquid discharge tank 27 comprises a tank body, a liquid inlet is arranged at the upper end of the tank body, a liquid outlet is arranged at the lower end of the tank body, and an exhaust port is arranged on the side wall of the tank body. The inlet of the adjusting pipeline 25 is connected with the outlet of the second filter 23, the inlet of the adjusting pipeline 25 is connected with the exhaust port of the automatic liquid discharge tank 27, and the liquid inlet of the automatic liquid discharge tank 27 is connected with the outlet of the second filter 23. In this embodiment, the liquid filtered by the second filter 23 flows into the tank body from the liquid inlet of the automatic liquid discharge tank, and when the amount of the liquid in the tank body reaches a certain amount, the liquid is discharged from the liquid outlet, so that automatic liquid discharge is realized. An automatic drain tank 27 is provided on the drain line 26 to facilitate the drainage of the liquid filtered by the second filter 23 and prevent the liquid from accumulating in the second filter 23 and affecting the filtering effect of the second filter 23. Preferably, the automatic drain tank 27 may be replaced with a shut-off valve, and the opening degree of the shut-off valve is appropriately adjusted to drain the liquid filtered by the second filter 23. In the preferred embodiment, the adjusting pipeline 25 can only branch off the exhaust gas except the exhaust gas flowing into the detecting device, so as to control the flow rate of the exhaust gas entering the detecting device, increase the speed of the exhaust gas entering the detecting device, and further increase the response speed of detection. The adjusting pipeline 25 can also perform the air exhaust of the automatic liquid discharge tank 27, reduce the air resistance and facilitate the liquid discharge.

Wherein the pump assembly 22 comprises at least one sampling pump. A plurality of sampling pumps are connected in series to form a pump assembly to increase the pumping power of the pump assembly 22. A plurality of sampling pumps are connected in parallel to form a pump assembly, and switching standby is achieved.

As a preferable example, as shown in fig. 9, the pump assembly 22 includes a first sampling pump 221, a second sampling pump 222, a first three-way valve 223, and a second three-way valve 224, a port a of the first three-way valve 223 is connected to the second intake line 21, a port B of the first three-way valve 223 is connected to an inlet of the first sampling pump 221, a port C of the first three-way valve 223 is connected to an inlet of the second sampling pump 222, an outlet of the first sampling pump 221 is connected to a port B of the second three-way valve 224, an outlet of the second sampling pump 222 is connected to a port C of the second three-way valve 224, and a port a of the second three-way valve 224 is connected to the second filter 23. The port a of the first three-way valve (223) is a common port of the first three-way valve (223), and the port a of the second three-way valve (224) is a common port of the second three-way valve (224).

In the preferred embodiment, two sampling pumps are used, one sampling pump runs, the other sampling pump is standby, the sampling pumps can be switched when the maintenance is carried out, and the waste gas monitoring is not stopped. The first sampling pump 221 and the second sampling pump 222 are used for standby through the first three-way valve 223 and the second three-way valve 224, and the first sampling pump 221 and the second sampling pump 222 are switched through the switching of the first three-way valve 223 and the second three-way valve 224, so that the switching is simple, convenient and controllable. Preferably, the second flow rate adjustment valve and the third flow rate adjustment valve are connected in parallel to the first sampling pump 221 and the second sampling pump 222, respectively. The flow regulation of the sampling pump can be realized, the sampling pump is prevented from being blocked and short-circuited, and the safety is improved.

As a preferable example, as shown in fig. 10, the recovery device 4 includes a recovery pipe 41, a gas pipe 42, a pressure compensating pipe 43, a pressure supply pipe 44, and an ejector 45, an outlet of the recovery pipe 41 is connected to a suction port of the ejector 45, an inlet of the gas pipe 42 is connected to a gas source, an outlet of the gas pipe 42 is connected to inlets of the pressure compensating pipe 43 and the pressure supply pipe 44, respectively, an outlet of the pressure compensating pipe 43 is connected to the recovery pipe 41, and an outlet of the pressure supply pipe 44 is connected to an inlet of the ejector 45. The pressure compensating pipe 43 is provided with a fourth flow rate adjusting valve 431, and the pressure supply pipe 44 is provided with a fifth flow rate adjusting valve 441.

In the preferred embodiment, the inlet of the recycling pipe 41 is connected with the detection device and the adjusting pipeline, the outlet of the recycling pipe 41 is connected with the air suction port of the ejector 45, the outlet of the ejector 45 is connected with the torch discharge pipeline, and the waste gas output by the detection device and the adjusting pipeline is transmitted into the torch discharge pipeline. The inlet of the gas pipe 42 is connected with a carrier gas source, and the outlet of the gas pipe 42 is respectively connected with the inlets of the pressure compensating pipe 43 and the pressure supply pipe 44. The outlet of the pressure supply pipe 44 is connected to the inlet of the ejector 45, and the outlet of the pressure compensating pipe 43 is connected to the recovery pipe 41. The gas delivery tube 42 delivers a carrier gas, a portion of which flows into the supply tube 44 and another portion of which flows into the pressure compensation tube 43. The carrier gas in the pressure supply pipe 44 flows to the ejector 45, so that the air suction port of the ejector 45 generates negative pressure to suck the waste gas and push the waste gas to be conveyed to the flare exhaust pipeline. The carrier gas in the pressure compensating pipe 43 flows into the recovery pipe 41 to compensate the flow at the inlet of the recovery pipe 41, so that the pressure at the inlet is close to the normal pressure, the gas transmission port of the detection device is prevented from generating back pressure, and the detection accuracy is ensured. The carrier gas entering the recovery pipe 41 is conveyed with the exhaust gas to the flare vent line under suction by the ejector 45. The fourth flow regulating valve 431 is used to regulate the flow of the carrier gas into the pressure compensating pipe 43, thereby regulating the pressure at the front end of the recovery pipe 41. The fifth flow regulating valve 441 is used to regulate the flow of the carrier gas into the pressure supply pipe 44, thereby regulating the pressure at the outlet of the ejector. The recovery device 4 in the preferred embodiment can pressurize and drive back the waste gas to the torch, and simultaneously can ensure that the pressure at the outlet of the detection device is close to the normal pressure, without influencing the detection precision of the detection device.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the claims and their equivalents.

Claims

1. A torch waste gas emission monitoring system is characterized by comprising a sampling device, a pretreatment device, a detection device (3) and a recovery device (4) which are sequentially communicated; the sampling device comprises a probe, a first air inlet pipeline (11), a first filter (12) and a first air outlet pipeline (13) which are sequentially communicated, and the pretreatment device comprises a second air inlet pipeline (21), a pump assembly (22), a second filter (23) and a second air outlet pipeline (24) which are sequentially communicated; the first air outlet pipeline (13) is communicated with the second air inlet pipeline (21), and the second air outlet pipeline (24) is communicated with the detection device (3); the pretreatment device further comprises an adjusting pipeline (25), an inlet of the adjusting pipeline (25) is communicated with an outlet of the second filter (23), an outlet of the adjusting pipeline (25) is communicated with the recovery device (4), and a first flow adjusting valve (251) is arranged on the adjusting pipeline (25).

2. A flare exhaust gas emission monitoring system according to claim 1, further comprising a detection calibration device in communication with the detection device (3).

3. A flare waste gas emission monitoring system as defined in claim 2, wherein the detection calibration device comprises a third gas inlet pipeline (31), a calibration valve group (32) and a third gas outlet pipeline (33) which are communicated in sequence, and the calibration valve group (32) is used for switching the connection and disconnection between the third gas inlet pipeline (31) and the third gas outlet pipeline (33); the third air outlet pipeline (33) is communicated with the detection device (3).

4. A flare exhaust gas emission monitoring system according to claim 3, wherein the calibration valve group (32) comprises N groups of valve group units, each group of valve group units comprising a first two-position three-way valve (321) and a second two-position three-way valve (322), a port B of the first two-position three-way valve being connected with a port C of the second two-position three-way valve, the port C of the first two-position three-way valve being connected with the recovery device (4); the port B of the first two-position three-way valve is a common end of the first two-position three-way valve, and the port B of the second two-position three-way valve is a common end of the first two-position three-way valve; and N is an integer greater than or equal to 1.

5. The flare exhaust emission monitoring system of claim 4, wherein the N is 1; the third air inlet pipeline (31) is provided with 1 pipeline, the third air inlet pipeline (31) is connected with a port A of the first two-position three-way valve, the third air outlet pipeline (33) is connected with a port B of the second two-position three-way valve, and the port A of the second two-position three-way valve is connected with the recovery device (4); the valve group unit is in a normal state that a port B of the first two-position three-way valve is communicated with a port C, and a port A of the second two-position three-way valve is communicated with the port B.

6. The flare exhaust emission monitoring system of claim 4, wherein the N is 4; the port B of the second two-position three-way valve of the front group of valve group units in the two adjacent groups of valve group units is connected with the port A of the second two-position three-way valve of the rear group of valve group units; the third air inlet pipeline (31) is provided with 4 pipelines, and ports A of a first two-position three-way valve of the 4 groups of valve group units are respectively connected with the 4 third air inlet pipelines (31) in a one-to-one correspondence manner; a port B of a second two-position three-way valve of the last group of valve bank units is connected with a third gas outlet pipeline (33), and a port A of the second two-position three-way valve of the first group of valve bank units is connected with a recovery device (4); the normal state of all the valve group units is that the port B of the first two-position three-way valve is communicated with the port C, and the port A of the second two-position three-way valve is communicated with the port B.

7. A flare waste gas emission monitoring system according to claim 3, wherein the second gas outlet pipeline (24) is connected with the detection device (3) through a calibration valve set (32) and a third gas outlet pipeline (33), the second gas outlet pipeline (24) is connected with the calibration valve set (32), and the calibration valve set (32) is used for switching the third gas inlet pipeline (31) and the second gas outlet pipeline (24) so that the third gas inlet pipeline (31) or the second gas outlet pipeline (24) is communicated with the third gas outlet pipeline (33).

8. A flare exhaust gas emission monitoring system according to claim 7, wherein the calibration valve group (32) comprises N groups of valve group units, each group of valve group units comprising a first two-position three-way valve (321) and a second two-position three-way valve (322), a port B of the first two-position three-way valve being connected with a port C of the second two-position three-way valve, the port C of the first two-position three-way valve being connected with the recovery device (4); and N is an integer greater than or equal to 1.

9. The flare exhaust emission monitoring system of claim 8, wherein the N is 1; the third air inlet pipeline (31) is provided with 1 pipeline, the third air inlet pipeline (31) is connected with a port A of the first two-position three-way valve, the second air outlet pipeline (24) is connected with a port A of the second two-position three-way valve, and the third air outlet pipeline (33) is connected with a port B of the second two-position three-way valve; the valve group unit is normally provided with a port B of the first two-position three-way valve communicated with a port C, and a port A of the second two-position three-way valve communicated with the port B.

10. The flare exhaust emission monitoring system of claim 8, wherein the N is 4; the port B of the second two-position three-way valve of the front group of valve group units in the two adjacent groups of valve group units is connected with the port A of the second two-position three-way valve of the rear group of valve group units; the third air inlet pipeline (31) is provided with 4 pipelines, and ports A of a first two-position three-way valve of the 4 groups of valve group units are respectively connected with the 4 third air inlet pipelines (31) in a one-to-one correspondence manner; the port B of the second two-position three-way valve of the last group of valve bank units is connected with a third gas outlet pipeline (33); a second air outlet pipeline (24) is connected with a port A of a second two-position three-way valve of the first group of valve bank units; the valve group unit connected with the third air inlet pipeline (31) is in a normal state that a port B of a first two-position three-way valve is communicated with a port C, and a port A of a second two-position three-way valve is communicated with the port B; the normal state of the valve group unit connected with the second air outlet pipeline (24) is that the port A of the first two-position three-way valve is communicated with the port B, and the port B of the second two-position three-way valve is communicated with the port C.

11. The flare exhaust emission monitoring system of claim 8, wherein the N is 5; the port B of the second two-position three-way valve of the front group of valve group units in the two adjacent groups of valve group units is connected with the port A of the second two-position three-way valve of the rear group of valve group units; the third air inlet pipeline (31) is provided with 4 pipelines, and the 4 pipelines of the third air inlet pipeline (31) and the second air outlet pipeline (24) are respectively connected with the ports A of the first two-position three-way valves of the 5 groups of valve group units in a one-to-one correspondence manner; a port B of a second two-position three-way valve of the last group of valve bank units is connected with a third gas outlet pipeline (33), and a port A of the second two-position three-way valve of the first group of valve bank units is connected with a recovery device (4); the normal state of the valve group unit connected with the second air outlet pipeline (24) is that a port A of the first two-position three-way valve is communicated with a port B, and a port B of the second two-position three-way valve is communicated with a port C; the other four groups of valve group units are in a normal state that a port B of a first two-position three-way valve is communicated with a port C, and a port A of a second two-position three-way valve is communicated with the port B.

12. A flare exhaust gas emission monitoring system according to claim 3, wherein the detection calibration device further comprises a fourth gas outlet pipeline and a fourth gas inlet pipeline, an inlet of the fourth gas outlet pipeline is connected with the calibration valve group (32), and an outlet of the fourth gas outlet pipeline is connected with the first gas inlet pipeline (11); the inlet of the fourth air inlet pipeline is connected with the outlet of the second filter (23), and the outlet of the fourth air inlet pipeline is connected with the calibration valve group (32); the calibration valve group (32) is also used for switching the connection and disconnection between the third air inlet pipeline (31) and the fourth air outlet pipeline and the connection and disconnection between the fourth air inlet pipeline and the third air outlet pipeline (33).

13. A flare exhaust gas emission monitoring system according to claim 1, further comprising a full system calibration device connected to the first intake conduit (11).

14. A flare exhaust emission monitoring system according to claim 1, wherein the sampling device further comprises a housing, the probe is located outside the housing, and the first inlet line (11), the first filter (12), and the first outlet line (13) are all located within the housing; the outer surface of the shell is provided with an electric heat tracing piece, and the shell is made of heat conducting materials.

15. The flare exhaust emission monitoring system of claim 14, wherein the temperature within the housing is 60-180 ℃.

16. A flare exhaust gas emission monitoring system according to claim 14, wherein the housing is provided with a first air inlet and a first air outlet, the first air inlet is provided with a first blowing member, and the first blowing member is located outside the housing and blows air into the housing.

17. A flare exhaust gas emission monitoring system according to claim 1, wherein the pretreatment device further comprises a holding tank in which the second inlet line (21), the pump assembly (22), the second filter (23), the second outlet line (24), and the regulating line (25) are located; a heater is arranged in the heat preservation box body.

18. The flare exhaust emission monitoring system of claim 17, wherein the temperature in the insulated cabinet is 60-180 ℃.

19. The flare exhaust gas emission monitoring system of claim 17, wherein the insulation box body is provided with a second air inlet and a second air outlet, the second air inlet is provided with a second blowing member, and the second blowing member is located outside the insulation box body and blows air into the insulation box body.

20. A flare exhaust emission monitoring system according to claim 1, wherein the second filter (23) is used to filter moisture or moisture and particulates in the exhaust.

21. A flare exhaust gas emission monitoring system according to claim 20, wherein the pretreatment device further comprises a liquid discharge line (26), the liquid discharge line (26) being connected with the second filter (23); an automatic liquid discharge tank (27) is arranged on the liquid discharge pipeline (26), the automatic liquid discharge tank (27) comprises a tank body, a liquid inlet is formed in the upper end of the tank body, a liquid outlet is formed in the lower end of the tank body, and an exhaust port is formed in the side wall of the tank body; the inlet of the adjusting pipeline (25) is connected with the outlet of the second filter (23), the inlet of the adjusting pipeline (25) is connected with the exhaust port of the automatic liquid discharge tank (27), and the liquid inlet of the automatic liquid discharge tank (27) is connected with the outlet of the second filter (23).

22. A flare exhaust emission monitoring system according to claim 1, wherein the pump assembly (22) comprises at least one sampling pump.

23. A flare exhaust emission monitoring system according to claim 1, wherein the pump assembly (22) comprises a first sampling pump (221), a second sampling pump (222), a first three-way valve (223) and a second three-way valve (224), a port a of the first three-way valve (223) is connected to the second air intake line (21), a port B of the first three-way valve (223) is connected to an inlet of the first sampling pump (221), a port C of the first three-way valve (223) is connected to an inlet of the second sampling pump (222), an outlet of the first sampling pump (221) is connected to a port B of the second three-way valve (224), an outlet of the second sampling pump (222) is connected to a port C of the second three-way valve (224), a port a of the second three-way valve (224) is connected to the second filter (23); the port a of the first three-way valve (223) is a common port of the first three-way valve (223), and the port a of the second three-way valve (224) is a common port of the second three-way valve (224).

24. A flare exhaust gas emission monitoring system according to claim 23, wherein a second flow regulating valve is connected in parallel to the first sampling pump (221), and a third flow regulating valve is connected in parallel to the second sampling pump (222).

25. The flare waste gas emission monitoring system according to claim 1, wherein the recovery device comprises a recovery pipe (41), an air conveying pipe (42), a pressure compensating pipe (43), a pressure supplying pipe (44) and an ejector (45), an outlet of the recovery pipe (41) is connected with an air suction port of the ejector (45), an inlet of the air conveying pipe (42) is connected with an air source, an outlet of the air conveying pipe (42) is respectively connected with inlets of the pressure compensating pipe (43) and the pressure supplying pipe (44), an outlet of the pressure compensating pipe (43) is connected with the recovery pipe (41), and an outlet of the pressure supplying pipe (44) is connected with an inlet of the ejector (45); the pressure compensating pipe (43) is provided with a fourth flow regulating valve (431), and the pressure supply pipe (44) is provided with a fifth flow regulating valve (441).