On-line enrichment and sample introduction device and on-line enrichment and sample introduction method for volatile organic chemicals (VOCs) in atmosphere

A sampling device and sampling technology, applied in measurement devices, instruments, scientific instruments, etc., can solve problems such as rapid pretreatment of gas samples that are not suitable for on-site, and achieve a high degree of automation, accurate control of carrier gas pressure and flow, and operation. simple effect

Pending Publication Date: 2018-06-22
HENAN HANWEI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But at present, commercialized thermal desorption tubes developed according to this technology are only suitable for sample pretreatment in the laboratory, not suitable for rapid pretreatment of gas samples on site

Method used

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  • On-line enrichment and sample introduction device and on-line enrichment and sample introduction method for volatile organic chemicals (VOCs) in atmosphere
  • On-line enrichment and sample introduction device and on-line enrichment and sample introduction method for volatile organic chemicals (VOCs) in atmosphere
  • On-line enrichment and sample introduction device and on-line enrichment and sample introduction method for volatile organic chemicals (VOCs) in atmosphere

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Such as figure 1 As shown, an atmospheric VOCs online enrichment sampling device includes a control system, a sample gas inlet 1, a carrier gas inlet 12, a filter 2, a first electromagnetic two-way valve 3, an electromagnetic multi-way valve, a thermal desorption pipe 14, The second electromagnetic two-way valve 5, the sampling air pump 9, the sample gas exhaust port 10 and the sample injection analysis port 16;

[0052] Preferably, the electromagnetic multi-way valve is an electromagnetic six-way valve 4 or an electromagnetic four-way valve, and the electromagnetic multi-way valve in this embodiment is an electromagnetic six-way valve 4;

[0053] Such as figure 2 As shown, one interface of the electromagnetic six-way valve 4 is recorded as the first interface, and the remaining five interfaces are numbered counterclockwise in sequence; when the electromagnetic six-way valve 4 is powered off, the The first interface is connected to the second interface, the third int...

Embodiment 2

[0077] The difference between this embodiment and Embodiment 1 is that: Figure 10 As shown, it also includes a redundant electromagnetic multi-way valve, a redundant thermal desorption pipe 15, a third electromagnetic two-way valve 6 and a fourth electromagnetic two-way valve 7, preferably, wherein the redundant electromagnetic multi-way valve is redundant Surplus electromagnetic six-way valve 11 or redundant electromagnetic four-way valve. The redundant electromagnetic multi-way valve described in the embodiment of the present invention selects the redundant electromagnetic six-way valve 11;

[0078] Note that one interface of the redundant electromagnetic six-way valve 11 is the first interface, and the remaining five interfaces are numbered counterclockwise; when the redundant electromagnetic six-way valve 11 is powered off, the redundant electromagnetic six-way The first interface of the valve 11 is connected to the second interface, the third interface is connected to the...

Embodiment 3

[0098] The difference between this embodiment and Embodiment 1 is that: Figure 14 As shown, the electromagnetic multi-way valve is a double electromagnetic four-way valve composed of a first electromagnetic four-way valve 19 and a second electromagnetic four-way valve 20; specifically, the first electromagnetic four-way valve 19 and the second electromagnetic four-way valve The electromagnetic four-way valve 20 is the same electromagnetic four-way valve. When the electromagnetic four-way valve is powered off, the first interface of the electromagnetic four-way valve communicates with the second interface of the electromagnetic four-way valve. The third interface of the four-way valve communicates with the fourth interface of the electromagnetic four-way valve; when the electromagnetic four-way valve is energized, the first interface of the electromagnetic four-way valve and the third interface of the electromagnetic four-way valve The ports are connected, and the second port ...

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Abstract

The invention provides an on-line enrichment and sample introduction device and an on-line enrichment and sample introduction method for volatile organic chemicals (VOCs) in atmosphere. The device comprises a control system, a sample gas inlet, a carrier gas inlet, a filter, a first electromagnetic two-way valve, an electromagnetic multi-way valve, a pyrolysis suction tube, a second electromagnetic two-way valve, a sample gas flow regulating device, a carrier gas flow regulating device, a sampling air pump, a sample gas emptying hole and a sample introduction analytic port, wherein the samplegas inlet is connected with the first port of the first electromagnetic two-way valve by means of the filter, the carrier gas inlet is communicated with the first port of the carrier gas flow regulating device, the first port of the sampling air pump is connected with the second port of the second electromagnetic two-way valve by means of the sample gas flow regulating device, the second port of the sampling air pump is communicated with the sample gas emptying hole, and the electromagnetic multi-way valve is respectively connected with the pyrolysis suction tube, the second port of the firstelectromagnetic two-way valve, the first port of the second electromagnetic two-way valve and the sample introduction analytic port.

Description

technical field [0001] The invention relates to the field of enrichment and sampling, in particular to an online enrichment and sampling device and method for atmospheric VOCs. Background technique [0002] With the increasing popularity of industrial pollution and automobiles, the content of volatile organic compounds (VOCs) in the ambient air is increasing, and the adverse effects of volatile organic compounds (VOCs) in the air on human health and the environment have received widespread attention. Among them, benzene series have been confirmed as strong carcinogens by the International Cancer Research Center (IARC). An effective method to detect volatile organic compounds in the air is to use thermal desorption technology to pretreat harmful substances in the air. Thermal desorption technology is a technology that can analyze volatile organic compounds (VOCs) in the air without solvents. [0003] But at present, the commercial thermal desorption tubes developed accordin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/08G01N30/20
CPCG01N30/08G01N30/20G01N2030/201
Inventor 李志刚张华杰王栋陈海永李志慎金鸽
Owner HENAN HANWEI ELECTRONICS
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