WO2021056657A1

WO2021056657A1 - Device and method for performing continuous online sampling and monitoring of vocs at multiple points

Info

Publication number: WO2021056657A1
Application number: PCT/CN2019/113123
Authority: WO
Inventors: 曹迅; 吕金诺; 杨惠锋; 陈伟章; 黎红玉; 陈谷德; 封荣贵; 陈州富; 洪义; 燕志奇
Original assignee: 广州禾信仪器股份有限公司; 昆山禾信质谱技术有限公司
Priority date: 2019-09-25
Filing date: 2019-10-24
Publication date: 2021-04-01

Abstract

A device (10) and method for performing continuous online sampling and monitoring of VOCs at multiple points. The device (10) for performing continuous online sampling and monitoring of VOCs at multiple points comprises an analyzer (100), a gas suction mechanism (200), a gas storage mechanism (300), a sampling tube (400), a communicating member (500), a first control valve (600) and a second control valve (700). Multiple sampling tubes (400) are provided, wherein each sampling tube (400) respectively communicates with the communicating member (500) by means of the first control valve (600). The communicating member (500) communicates with the gas storage mechanism (300). The gas storage mechanism (300) communicates with the analyzer (100) and the gas suction mechanism (200) by means of the second control valve (700). The device (10) for performing continuous online sampling and monitoring of VOCs at multiple points can remotely perform continuous online sampling of VOCs at different locations within a short period of time, and can perform quantitative detection on unknown VOCs in the environment.

Description

Multi-point VOCs online continuous sampling monitoring device and method

Technical field

The invention relates to the field of environmental protection, in particular to a multi-point VOCs online continuous sampling monitoring device and method.

Background technique

At present, the sampling method for online monitoring of known target VOCs (volatile organic compounds) components at multiple points within a diameter of 1km is to directly configure a sampling tube with a length of no more than 100m through a single testing instrument. Conduct monitoring. The sampling method for online monitoring of known target VOCs (volatile organic compounds) components at multiple points in a large area is usually used to monitor VOCs online at different locations at the same time using multiple instruments or to carry a portable instrument to monitor online VOCs on a large scale. In continuous online monitoring, the cost of using multiple instruments at the same time is high, and frequent movement of the instruments is too wasteful of human resources.

Summary of the invention

Based on this, it is necessary to provide a multi-point VOCs online continuous sampling monitoring device and method that can continuously sample VOCs in different locations at a long distance in a short time, and quantitatively detect unknown VOCs in the environment through analytical instruments.

A multi-point VOCs online continuous sampling monitoring device, comprising an analysis instrument, an air pumping mechanism, a gas storage mechanism, a sampling pipe, a connecting piece, a first control valve and a second control valve; the number of the sampling pipes is multiple, Each of the sampling pipes is respectively connected to the connecting member through the first control valve, the connecting member is connected to the gas storage mechanism, and the gas storage mechanism is connected to the analysis instrument and the analysis instrument through the second control valve. The suction mechanism.

In one of the embodiments, the analysis instrument is an air detection instrument.

In one of the embodiments, the suction mechanism is a suction pump.

In one of the embodiments, the second control valve is a three-way solenoid valve or a two-way solenoid valve.

In one of the embodiments, the number of the air storage mechanism is multiple, the multiple air storage mechanisms are arranged side by side and are all connected to the communicating member, and the multiple air storage mechanisms all pass through the corresponding first Two control valves are connected to the analysis instrument, and a plurality of the gas storage mechanisms are all connected to the air pumping mechanism through the corresponding second control valves.

In one of the embodiments, the number of the air pumping mechanism is at least two, and each air pumping mechanism is correspondingly connected with at least one air storage mechanism.

In one of the embodiments, the number of the air storage mechanism is the same as the number of the air extraction mechanism, and the plurality of air storage mechanisms corresponds to the plurality of air extraction mechanisms one-to-one, and each of the air storage mechanisms is It is connected to the corresponding suction mechanism through the corresponding second control valve.

In one of the embodiments, the air pressure detection mechanism is further included, and the air pressure detection mechanism is provided on the pipeline between the air storage mechanism and the connecting member.

In one of the embodiments, the air pressure detection mechanism is a barometer.

A method for online continuous sampling and monitoring of VOCs in a large-scale multi-point location in a monitoring environment includes the following steps:

The gas storage mechanism and the analysis instrument are connected through the second control valve. The gas extraction mechanism performs sampling through a sampling tube. The gas sampled by the sampling tube is stored in the gas storage mechanism and enters the analysis instrument for analysis. The air pressure value inside reaches the preset value, it means that the gas detection of the sampling tube is completed;

Sampling and analysis of different sampling tubes are carried out in chronological order.

The multi-point VOCs online continuous sampling monitoring device of the present invention is equipped with a gas storage mechanism. The samples collected by sampling tubes of different lengths are stored through the gas storage mechanism and sent to the analysis instrument for testing under a constant air pressure value. The gas storage mechanism can also Reduce the detection limit of VOCs under long-distance sampling. When the air pressure value in the gas storage mechanism reaches the preset value, it means that the detection of the gas collected by the sampling tube is completed, and the different sampling tubes are sampled and analyzed in chronological order. Compared with the traditional technology, the present invention achieves continuous Sampling and analysis. The multi-point VOCs online continuous sampling monitoring device of the present invention can continuously online sampling VOCs at different locations at a long distance in a short time, and quantitatively detect unknown VOCs in the environment through an analytical instrument.

In the multi-point VOCs online continuous sampling monitoring device of the present invention, an air pressure detection mechanism is provided at the air storage mechanism to measure the air pressure value of the air storage mechanism, and the detected air pressure value is used to determine the storage condition of the air storage mechanism and whether the detection is completed. When the air pressure value in the gas storage mechanism reaches the preset value, it means that the gas collected by the sampling tube has been detected, and the next sampling tube can be collected and analyzed.

The multi-point VOCs online continuous sampling monitoring device of the present invention is provided with a plurality of sampling pipes, the sampling pipe channels are switched through each first control valve, and different sampling pipes are sampled in sequence according to the time sequence.

In the multi-point VOCs online continuous sampling monitoring device of the present invention, the analysis instrument after sampling selects an air detection instrument with a fast detection time, which can perform qualitative and quantitative analysis on unknown VOCs in a short time, thereby improving detection efficiency and detection sensitivity.

Description of the drawings

Figure 1 is a schematic diagram of a multi-point VOCs online continuous sampling and monitoring device according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of a multi-point VOCs online continuous sampling and monitoring device according to another embodiment of the present invention.

Description of Reference Signs

10: Multi-point VOCs online continuous sampling and monitoring device; 100: analytical instrument; 200: pumping mechanism; 300: gas storage mechanism; 400: sampling pipe; 500: connecting parts; 600: first control valve; 700: second Control valve; 800: air pressure detection mechanism.

detailed description

In order to facilitate the understanding of the present invention, the present invention will be more fully described below with reference to the relevant drawings. The preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

It should be noted that when an element is referred to as being "fixed to" another element, it can be directly fixed on the other element or a central element may also be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or an intermediate element may be present at the same time. When an element is considered to be "mounted on" another element, it can be directly mounted on the other element or a centered element may exist at the same time. When an element is considered to be "installed on" another element, it can be directly provided on the other element or there may be a centered element at the same time.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and/or" as used herein includes any and all combinations of one or more related listed items.

As shown in FIG. 1, an embodiment of the present invention provides a multi-point VOCs online continuous sampling and monitoring device 10, which includes an analytical instrument 100, an air pumping mechanism 200, a gas storage mechanism 300, a sampling tube 400, a connecting piece 500, The first control valve 600 and the second control valve 700.

The number of sampling tubes 400 is multiple, and each sampling tube 400 is respectively connected to the connecting member 500 through the first control valve 600. The length of the sampling tube 400 is 20-100 meters, for example, the length of the sampling tube 400 is 20 meters, 30 meters, 50 meters, 100 meters or other non-integer values. The connecting member 500 communicates with the air storage mechanism 300. The gas storage mechanism 300 is connected to the analytical instrument 100 and the gas extraction mechanism 200 through the second control valve 700. The first control valve 600 is a two-way solenoid valve.

The multi-point VOCs online continuous sampling monitoring device 10 of the present invention is provided with multiple sampling tubes 400, and the channels of the sampling tubes 400 are switched through each first control valve 600, and the 400 channels of different sampling tubes are sampled in sequence according to the time sequence. Realize continuous sampling in chronological order.

Further, the analysis instrument 100 is an air detection instrument. In the multi-point VOCs online continuous sampling monitoring device 10 of the present invention, the analysis instrument 100 after sampling selects an air detection instrument with a fast detection time, which can perform qualitative and quantitative analysis on unknown VOCs in a short time, when fast and sensitive qualitative and quantitative analysis is required A mass spectrometer can be selected as the analysis instrument 100 to improve the detection efficiency and detection sensitivity.

Preferably, the air extraction mechanism 200 is an air extraction pump.

Further, the second control valve 700 is a three-way solenoid valve or a two-way solenoid valve.

In one of the embodiments, the number of the air storage mechanism 300 is multiple. A plurality of gas storage mechanisms 300 are arranged in parallel and communicate with the connecting member 500. The plurality of gas storage mechanisms 300 are all connected to the analytical instrument 100 through a corresponding second control valve 700, and the plurality of gas storage mechanisms 300 are all connected through a corresponding second control valve. The valve 700 communicates with the air suction mechanism 200.

Further, the number of the suction mechanism 200 is at least two. At least one air storage mechanism 300 is connected to each air pumping mechanism 200. As shown in FIG. 1, two air storage mechanisms 300 are correspondingly connected to one air extraction mechanism 200, that is, two or more air storage mechanisms 300 can share one air extraction mechanism 200. This arrangement can reduce the number of air extraction mechanisms 200. save costs.

Further, in another embodiment, the number of the air storage mechanism 300 is the same as the number of the air suction mechanism 200. The multiple air storage mechanisms 300 correspond to the multiple air extraction mechanisms 200 one-to-one, and each air storage mechanism 300 is connected to the corresponding air extraction mechanism 200 through a corresponding second control valve 700. As shown in FIG. 2, each air storage mechanism 300 is correspondingly connected to an air extraction mechanism 200. Although the cost is increased in this design, each air storage mechanism 300 can correspond to an air extraction mechanism 200, which can realize independent operation and avoid The problem of interference from other gases that may be caused by sharing the same pumping mechanism 200. In addition, multiple air extraction mechanisms 200 and multiple air storage mechanisms 300 can be pumped and stored at the same time, saving sampling time.

Preferably, as shown in FIG. 1, the gas storage mechanism 300 may be composed of a gas storage tank and a pipeline connected to the gas storage tank.

Furthermore, the multi-point VOCs online continuous sampling and monitoring device 10 of the present invention further includes an air pressure detection mechanism 800. The pipeline between the air storage mechanism 300 and the connecting member 500 is provided with an air pressure detection mechanism 800. Preferably, the air pressure detection mechanism 800 is a barometer, which can visually display the current air pressure value in the air storage mechanism, which can facilitate the operator to determine whether the analysis is completed. In the multi-point VOCs online continuous sampling monitoring device 10 of the present invention, an air pressure detecting mechanism 800 is provided at the air storage mechanism 300 to measure the air pressure value of the air storage mechanism 300, and the air pressure value detected by the air pressure detecting mechanism 800 is used to determine the air storage mechanism 300 storage status and whether the detection is completed. When the air pressure value in the gas storage mechanism 300 reaches the preset value, it means that the gas collected by the sampling tube 400 has been detected, and the next sampling tube 400 can be collected and analyzed, thus sampling is achieved , Continuous analysis, improve the efficiency of detection and analysis.

When the multi-point VOCs online continuous sampling and monitoring device 10 of the present invention is in use, it relates to a large-scale multi-point VOCs online continuous sampling and monitoring method in a monitoring environment, which includes the following steps:

The gas storage mechanism 300 and the analysis instrument 100 are connected through the second control valve 700, the gas extraction mechanism 200 performs sampling through the sampling pipe 400, and the gas sampled by the sampling pipe 400 is stored in the gas storage mechanism 300 and enters the analysis instrument 100 for analysis.

The air pressure detection mechanism 800 is used to measure the air pressure value of the gas storage mechanism 300. When the air pressure value in the air storage mechanism 300 reaches a preset value, it means that the gas detection of the sampling tube 400 is completed.

Sampling and analysis of different sampling tubes 400 are performed sequentially in chronological order.

The multi-point VOCs on-line continuous sampling monitoring device 10 of the present invention is provided with a gas storage mechanism 300, and samples collected by sampling tubes 400 of different lengths are stored through the gas storage mechanism 300 and sent to the analysis instrument 100 for testing under a constant pressure value. The gas storage mechanism 300 can also reduce the detection limit of VOCs under long-distance sampling. When the air pressure value in the gas storage mechanism 300 reaches the preset value, it indicates that the gas collected by the sampling tube 400 has been detected, and the different sampling tubes 400 are sampled and analyzed sequentially in chronological order. The multi-point VOCs online continuous sampling monitoring device 10 of the present invention can continuously online sampling VOCs at different locations at long distances in a short time, and quantitatively detect unknown VOCs in the environment through the analytical instrument 100.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the present invention, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

A multi-point VOCs online continuous sampling monitoring device, which is characterized in that it comprises an analysis instrument, a gas pumping mechanism, a gas storage mechanism, a sampling pipe, a connecting piece, a first control valve and a second control valve; the number of the sampling pipes There are multiple, each of the sampling pipes is respectively connected to the communicating member through the first control valve, the communicating member is connected to the gas storage mechanism, and the gas storage mechanism is connected to the communication member through the second control valve. The analysis instrument and the pumping mechanism.
The multi-point VOCs online continuous sampling and monitoring device according to claim 1, wherein the analysis instrument is an air detection instrument.
The multi-point VOCs online continuous sampling and monitoring device according to claim 1, wherein the air extraction mechanism is an air extraction pump.
The multi-point VOCs online continuous sampling monitoring device according to claim 1, wherein the second control valve is a three-way solenoid valve or a two-way solenoid valve.
The multi-point VOCs online continuous sampling and monitoring device according to claim 1, wherein the number of the gas storage mechanism is multiple, and the plurality of gas storage mechanisms are arranged in parallel and are all connected to the connecting member, The plurality of gas storage mechanisms are all connected to the analysis instrument through the corresponding second control valve, and the plurality of gas storage mechanisms are all connected to the air pumping mechanism through the corresponding second control valve.
The multi-point VOCs online continuous sampling and monitoring device according to claim 5, wherein the number of the air extraction mechanism is at least two, and each air extraction mechanism is correspondingly connected with at least one air storage mechanism.
The multi-point VOCs online continuous sampling and monitoring device according to claim 6, wherein the number of the air storage mechanism is the same as the number of the air pumping mechanism, and the plurality of the air storage mechanism is the same as the plurality of the air suction mechanism. The air pumping mechanisms are in one-to-one correspondence, and each of the air storage mechanisms is connected to the corresponding air pumping mechanism through the corresponding second control valve.
The multi-point VOCs online continuous sampling and monitoring device according to any one of claims 1-7, further comprising an air pressure detection mechanism, and the pipeline between the air storage mechanism and the connecting member is provided with The air pressure detection mechanism.
The multi-point VOCs online continuous sampling monitoring device according to any one of claims 1-7, wherein the air pressure detection mechanism is a barometer.
A method for on-line continuous sampling and monitoring of VOCs in a large-scale multi-point location in a monitoring environment is characterized in that it comprises the following steps:

The gas storage mechanism and the analysis instrument are connected through the second control valve. The gas extraction mechanism performs sampling through a sampling tube. The gas sampled by the sampling tube is stored in the gas storage mechanism and enters the analysis instrument for analysis. The air pressure value inside reaches the preset value, it means that the gas detection of the sampling tube is completed;

Sampling and analysis of different sampling tubes are carried out in chronological order.