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Non-methane total hydrocarbon detection system and method based on single valve

A non-methane total hydrocarbon detection system technology, which is applied in the field of non-methane total hydrocarbon detection system based on single valve, can solve the problems of difficult synchronization of valve switching, inaccurate analysis data, and the need for multi-channel carrier gas. Avoid the loss of analytical accuracy, accurate analytical data, and reduce the effect of chromatographic peak broadening

Inactive Publication Date: 2021-07-23
HANGZHOU PUYU TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The structure is complex, using ten-way valve plus six-way valve, and multi-channel carrier gas is required at the same time;
[0005] 2. It is difficult for the two valves to be synchronized, which will cause inaccurate analysis data

Method used

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  • Non-methane total hydrocarbon detection system and method based on single valve
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  • Non-methane total hydrocarbon detection system and method based on single valve

Examples

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Embodiment 1

[0032] figure 1 A schematic structural diagram of a non-methane total hydrocarbon detection system based on a single valve in an embodiment of the present invention is given, as figure 1 As shown, the non-methane total hydrocarbon detection system based on single valve comprises:

[0033] Quantitative loop 21, chromatographic column 41 and detector 31, these parts all are prior art;

[0034] A multi-way valve 11, such as a ten-way valve, the only port of the multi-way valve 11 is respectively connected to the two ends of the quantitative loop 21, the two ends of the chromatographic column 41, the sample gas, the carrier gas and the detector 31; The carrier gas is selectively connected to one end of the quantitative loop 21 and one end of the chromatographic column 41, and the other end of the quantitative loop 21 is selectively connected to the sample gas and the other end of the chromatographic column 41;

[0035] Adsorption tube 51, the adsorption tube 51 is connected in s...

Embodiment 2

[0046] An application example of the non-methane total hydrocarbon detection system and method based on a single valve according to Embodiment 1 of the present invention.

[0047] In this application example, if figure 1 As shown, the chromatographic column 41 is a PQ column, and the adsorption tube 51 is filled successively with Tenax (adsorbing low boiling point substances) with strong adsorption capacity and Carbalsleve (adsorbing high boiling point substances) with weak adsorption capacity; Through valve; Detector 31 adopts FID;

[0048] The adsorption tube is made of an inertized metal tube. The external power supply is connected to both ends of the adsorption tube, and the heating is directly energized, which significantly increases the heating rate.

[0049] The non-methane total hydrocarbon detection method based on a single valve in the embodiment of the present invention, that is, the working method of the detection system of this embodiment, the single-valve-based ...

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Abstract

The invention provides a non-methane total hydrocarbon detection system and method based on a single valve. The non-methane total hydrocarbon detection system based on a single valve comprises a sample loop, a chromatographic column and a detector. The ports of only one multi-way valve are respectively communicated with the two ends of the sample loop, the two ends of the chromatographic column, sample gas, carrier gas and the detector. The carrier gas is selectively communicated with one end of the sample loop and one end of the chromatographic column, and the other end of the sample loop is selectively communicated with the sample gas and the other end of the chromatographic column. An adsorption tube is connected with the chromatographic column in series. During sample introduction, gas in the sample loop sequentially passes through the adsorption tube and the chromatographic column, and the adsorption tube adsorbs non-methane hydrocarbon. A temperature control unit is used for heating and refrigerating the adsorption tube. The system has the advantages of simple structure and the like.

Description

technical field [0001] The invention relates to the detection of non-methane total hydrocarbons, in particular to a non-methane total hydrocarbon detection system and method based on a single valve. Background technique [0002] Non-methane total hydrocarbons (NMHC) refers to the general term for all other volatile hydrocarbons except methane. When the NMHC in the environment exceeds a certain concentration, it will cause direct harm to human health, and many volatile organic compounds have carcinogenic effects on the human body. Therefore, methane / non-methane total hydrocarbons have been listed as important monitoring indicators in many countries, and my country has also added Increased monitoring of NMHC in the environment. [0003] At present, the main working method of the non-methane total hydrocarbon detection device is to inject the sample to be tested into the gas chromatograph by using a ten-way valve plus a six-way valve, and measure the content of total hydrocarbo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/20
CPCG01N30/02G01N30/20G01N2030/201
Inventor 雷丽丽王琳琳李天麟田智林刘立鹏韩双来李显凤
Owner HANGZHOU PUYU TECH DEV CO LTD
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