Multi-point VOCs online continuous sampling monitoring device and method

Abstract

The present invention discloses a multi-point VOCs online continuous sampling monitoring device and method. The multi-point VOCs online continuous sampling monitoring device comprises an analytical instrument, an air extraction mechanism, an air storage mechanism, a sampling tube, a connecting piece, a first control valve and a second control valve; the number of the sampling tubes is multiple, each of the sampling tubes is connected to the connecting piece through the first control valve, the connecting piece is connected to the air storage mechanism, and the air storage mechanism is connected to the analytical instrument and the air extraction mechanism through the second control valve. The multi-point VOCs online continuous sampling monitoring device can continuously sample VOCs at different locations at a long distance in a short time, and quantitatively detect unknown VOCs in the environment through the analytical instrument.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection, and in particular to a multi-point VOCs online continuous sampling monitoring device and method. Background Art

[0002] At present, the sampling method for online monitoring of known target VOCs (volatile organic compounds) components at multiple points within a 1km diameter range is to directly monitor the VOCs in the environment near the detection instrument through a single detection instrument equipped with a sampling tube with a length of no more than 100m. In the sampling method for online monitoring of known target VOCs (volatile organic compounds) components at multiple points in a large area, multiple instruments are usually used to monitor VOCs online at different locations at the same time, or people carry portable instruments to monitor VOCs online over a large range. The cost of using multiple instruments at the same time for continuous online monitoring is high, and people carrying instruments frequently and moving around consumes too much human resources. Summary of the invention

[0003] Based on this, it is necessary to provide a multi-point VOCs online continuous sampling monitoring device and method that can continuously sample VOCs at different locations at long distances in a short period of time, and quantitatively detect unknown VOCs in the environment through analytical instruments.

[0004] A multi-point VOCs online continuous sampling and monitoring device comprises an analytical instrument, an air extraction mechanism, an air storage mechanism, a sampling tube, a connecting piece, a first control valve and a second control valve; the number of the sampling tubes is multiple, and each of the sampling tubes is connected to the connecting piece through the first control valve, the connecting piece is connected to the air storage mechanism, and the air storage mechanism is connected to the analytical instrument and the air extraction mechanism through the second control valve.

[0005] In one embodiment, the analytical instrument is an air detection instrument.

[0006] In one embodiment, the air extraction mechanism is an air extraction pump.

[0007] In one embodiment, the second control valve is a three-way solenoid valve or a two-way solenoid valve.

[0008] In one embodiment, there are multiple gas storage mechanisms, and the multiple gas storage mechanisms are arranged in parallel and connected to the connecting piece. The multiple gas storage mechanisms are connected to the analytical instrument through the corresponding second control valves, and the multiple gas storage mechanisms are connected to the gas extraction mechanism through the corresponding second control valves.

[0009] In one embodiment, the number of the air extraction mechanisms is at least two, and each of the air extraction mechanisms is connected to at least one corresponding air storage mechanism.

[0010] In one embodiment, the number of the gas storage mechanisms is consistent with the number of the gas exhaust mechanisms, and the multiple gas storage mechanisms correspond one-to-one to the multiple gas exhaust mechanisms, and each gas storage mechanism is connected to the corresponding gas exhaust mechanism through the corresponding second control valve.

[0011] In one of the embodiments, it further includes an air pressure detection mechanism, and the air pressure detection mechanism is provided on the pipeline between the air storage mechanism and the connecting piece.

[0012] In one embodiment, the air pressure detection mechanism is a barometer.

[0013] A method for online continuous sampling and monitoring of VOCs at multiple points in a large range in a monitoring environment comprises the following steps:

[0014] The gas storage mechanism is connected to the analytical instrument through the second control valve, and the gas extraction mechanism samples through the sampling tube. The gas sampled by the sampling tube is stored in the gas storage mechanism and enters the analytical instrument for analysis. When the air pressure value in the gas storage mechanism reaches a preset value, it indicates that the gas detection collected by the sampling tube is completed;

[0015] The different sampling tubes are sampled and analyzed in chronological order.

[0016] The multi-point VOCs online continuous sampling and monitoring device of the present invention adds a gas storage mechanism, which stores samples collected by sampling tubes of different lengths and sends them to an analytical instrument for detection 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 a preset value, it means that the detection of the gas collected by the sampling tube is completed. Different sampling tubes are sampled and analyzed in chronological order. Compared with traditional technologies, the present invention realizes continuous sampling and analysis. The multi-point VOCs online continuous sampling and monitoring device of the present invention can continuously sample VOCs at different long-distance locations in a short time, and quantitatively detect unknown VOCs in the environment through analytical instruments.

[0017] The multi-point VOCs online continuous sampling and monitoring device of the present invention has an air pressure detection mechanism at the gas storage mechanism to measure the air pressure value of the gas storage mechanism, and judges the storage condition of the gas storage mechanism and whether the detection is completed according to the detected air pressure value. When the air pressure value in the gas storage mechanism reaches a preset value, it indicates that the detection of the gas collected by the sampling tube is completed, and the collection and analysis of the next sampling tube can be implemented.

[0018] The multi-point VOCs online continuous sampling monitoring device of the present invention is provided with a plurality of sampling pipes, and the sampling pipe channels are switched by respective first control valves, so that different sampling pipelines are sampled in sequence according to time sequence.

[0019] The multi-point VOCs online continuous sampling monitoring device of the present invention uses an air detection instrument with a fast detection time as the analysis instrument after sampling, which can perform qualitative and quantitative analysis on unknown VOCs in a short time, thereby improving the detection efficiency and detection sensitivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a multi-point VOCs online continuous sampling and monitoring device according to an embodiment of the present invention;

[0021] Figure 2 This is a schematic diagram of a multi-point VOCs online continuous sampling and monitoring device according to another embodiment of the present invention.

[0022] Description of Reference Numerals

[0023] 10: Multi-point VOCs online continuous sampling monitoring device; 100: Analytical instrument; 200: Air extraction mechanism; 300: Air storage mechanism; 400: Sampling tube; 500: Connecting piece; 600: First control valve; 700: Second control valve; 800: Air pressure detection mechanism. DETAILED DESCRIPTION

[0024] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given 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.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly fixed to the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time. When an element is considered to be "mounted on" another element, it may be directly mounted on the other element or there may be an intermediate element at the same time. When an element is considered to be "located on" another element, it may be directly located on the other element or there may be an intermediate element at the same time.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0027] See also Figure 1As shown, an embodiment of the present invention provides a multi-point VOCs online continuous sampling and monitoring device 10, which includes an analytical instrument 100, a gas extraction mechanism 200, a gas storage mechanism 300, a sampling tube 400, a connecting piece 500, a first control valve 600 and a second control valve 700.

[0028] There are multiple sampling tubes 400, and each sampling tube 400 is connected to the connecting piece 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 piece 500 is connected to the gas storage mechanism 300. The gas storage mechanism 300 is connected to the analysis 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.

[0029] The multi-point VOCs online continuous sampling monitoring device 10 of the present invention is provided with a plurality of sampling tubes 400. The channels of the sampling tubes 400 are switched by respective first control valves 600, and different sampling tubes 400 are sampled in chronological order, thereby realizing continuous sampling in chronological order.

[0030] Furthermore, 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 uses an air detection instrument with a fast detection time after sampling, and can perform qualitative and quantitative analysis on unknown VOCs in a short time. When rapid and highly sensitive qualitative and quantitative analysis is required, a mass spectrometer can be selected as the analysis instrument 100 to improve detection efficiency and detection sensitivity.

[0031] Preferably, the air extraction mechanism 200 is an air extraction pump.

[0032] Furthermore, the second control valve 700 is a three-way solenoid valve or a two-way solenoid valve.

[0033] In one embodiment, there are multiple gas storage mechanisms 300. The multiple gas storage mechanisms 300 are arranged in parallel and are all connected to the connecting member 500. The multiple gas storage mechanisms 300 are all connected to the analytical instrument 100 through the corresponding second control valve 700, and the multiple gas storage mechanisms 300 are all connected to the gas extraction mechanism 200 through the corresponding second control valve 700.

[0034] Furthermore, the number of the air extraction mechanisms 200 is at least two. Each air extraction mechanism 200 is connected to at least one corresponding air storage mechanism 300. Figure 1 As shown, two gas storage mechanisms 300 are connected to one gas extraction mechanism 200 , that is, two or more gas storage mechanisms 300 can share one gas extraction mechanism 200 . Such a configuration can reduce the number of gas extraction mechanisms 200 and save costs.

[0035] Further, in another embodiment, the number of the gas storage mechanisms 300 is consistent with the number of the gas extraction mechanisms 200. The multiple gas storage mechanisms 300 correspond to the multiple gas extraction mechanisms 200 one by one, and each gas storage mechanism 300 is connected to the corresponding gas extraction mechanism 200 through the corresponding second control valve 700. Figure 2 As shown, each gas storage mechanism 300 is connected to a corresponding gas extraction mechanism 200. Although the cost is increased in this design, each gas storage mechanism 300 corresponds to a gas extraction mechanism 200, and can realize independent operation, avoiding the problem of interference from other gases that may be caused by sharing a gas extraction mechanism 200. In addition, multiple gas extraction mechanisms 200 and multiple gas storage mechanisms 300 can extract and store gas at the same time, saving sampling time.

[0036] Preferably, if Figure 1 As shown, the gas storage mechanism 300 may be composed of a gas storage tank and a pipeline connected to the gas storage tank.

[0037] Furthermore, the multi-point VOCs online continuous sampling monitoring device 10 of the present invention also includes an air pressure detection mechanism 800. The air pressure detection mechanism 800 is provided on the pipeline between the gas storage mechanism 300 and the connecting piece 500. Preferably, the air pressure detection mechanism 800 is a barometer, which can intuitively display the air pressure value in the current gas storage mechanism, which can facilitate the operator to judge whether the analysis is completed. The multi-point VOCs online continuous sampling monitoring device 10 of the present invention is provided with an air pressure detection mechanism 800 at the gas storage mechanism 300 to measure the air pressure value of the gas storage mechanism 300. The storage condition of the gas storage mechanism 300 and whether the detection is completed are judged by the air pressure value detected by the air pressure detection mechanism 800. When the air pressure value in the gas storage mechanism 300 reaches the preset value, it means that the gas detection collected by the sampling tube 400 is completed, and the collection and analysis of the next sampling tube 400 can be implemented, so as to achieve the continuity of sampling and analysis and improve the efficiency of detection and analysis.

[0038] When used, the multi-point VOCs online continuous sampling monitoring device 10 of the present invention relates to a large-scale multi-point VOCs online continuous sampling monitoring method in a monitoring environment, which comprises the following steps:

[0039] The gas storage mechanism 300 and the analytical instrument 100 are connected via the second control valve 700 , and the gas extraction mechanism 200 samples through the sampling tube 400 . The gas sampled by the sampling tube 400 is stored in the gas storage mechanism 300 and enters the analytical instrument 100 for analysis.

[0040] The air pressure detection mechanism 800 is used to measure the air pressure value of the air storage mechanism 300. When the air pressure value in the air storage mechanism 300 reaches a preset value, it indicates that the detection of the gas collected by the sampling tube 400 is completed.

[0041] The different sampling tubes 400 are sampled and analyzed in sequence according to the time sequence.

[0042] The multi-point VOCs online continuous sampling monitoring device 10 of the present invention adds a gas storage mechanism 300, which stores samples collected by sampling tubes 400 of different lengths, and sends them to the analytical instrument 100 for detection under a constant air 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 means that the gas detection collected by the sampling tube 400 is completed, and different sampling tubes 400 are sampled and analyzed in chronological order. The multi-point VOCs online continuous sampling monitoring device 10 of the present invention can perform continuous online sampling of VOCs at different long-distance locations in a short period of time, and quantitatively detect unknown VOCs in the environment through the analytical instrument 100.

[0043] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0044] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A multi-point VOCs online continuous sampling and monitoring device, characterized in that: It includes an analyzing instrument, an air extraction mechanism, an air storage mechanism, a sampling tube, a connecting piece, an air pressure detection mechanism, a first control valve and a second control valve; the analyzing instrument is an air detection instrument or a mass spectrometer, the number of the sampling tubes is multiple, different sampling tubes have different lengths, each of the sampling tubes is connected to the connecting piece through the first control valve, each first control valve can switch the sampling tube channel, the connecting piece is connected to the air storage mechanism, the air pressure detection mechanism is arranged on the pipeline between the air storage mechanism and the connecting piece, the air storage mechanism is connected to the analyzing instrument and the air extraction mechanism through the second control valve; the number of the air storage mechanism is multiple, the multiple air storage mechanisms are arranged in parallel and are connected to the connecting piece, the multiple air storage mechanisms are connected to the analyzing instrument through the corresponding second control valve, and the multiple air storage mechanisms are connected to the air extraction mechanism through the corresponding second control valve.

2. The multi-point VOCs online continuous sampling monitoring device according to claim 1 is characterized in that: The air extraction mechanism is an air extraction pump.

3. The multi-point VOCs online continuous sampling monitoring device according to claim 1 is characterized in that: The second control valve is a three-way solenoid valve or a two-way solenoid valve.

4. The multi-point VOCs online continuous sampling and monitoring device according to claim 1 is characterized in that: The number of the air extraction mechanisms is at least two, and each of the air extraction mechanisms is connected to at least one corresponding air storage mechanism.

5. The multi-point VOCs online continuous sampling and monitoring device according to claim 4 is characterized in that: The number of the gas storage mechanisms is consistent with the number of the gas extraction mechanisms, and the multiple gas storage mechanisms correspond one to one with the multiple gas extraction mechanisms. Each of the gas storage mechanisms is connected to the corresponding gas extraction mechanism through the corresponding second control valve.

6. The multi-point VOCs online continuous sampling and monitoring device according to any one of claims 1 to 5, characterized in that: The air pressure detection mechanism is a barometer.

7. A method for online continuous sampling and monitoring of VOCs at multiple points in a large range in a monitoring environment, characterized in that: The multi-point VOCs online continuous sampling monitoring device according to any one of claims 1 to 6 comprises the following steps: The gas storage mechanism is connected to the analytical instrument through the second control valve, and the gas extraction mechanism samples through the sampling tube. The gas sampled by the sampling tube is stored in the gas storage mechanism and enters the analytical instrument for analysis. The gas pressure value of the gas storage mechanism is measured by the gas pressure detection mechanism. When the gas pressure value in the gas storage mechanism reaches a preset value, it indicates that the detection of the gas collected by the sampling tube is completed; The different sampling tubes are sampled and analyzed in chronological order.

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