Analysis system and analysis method for methane and non-methane total hydrocarbons

A non-methane total hydrocarbon and analysis system technology, applied in the detection field of carbon-containing compounds, can solve the problems of inability to achieve continuous analysis, inability to obtain methane content, cumbersome operation and calibration processes, etc.

Active Publication Date: 2021-09-03
BEIJING SDL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to achieve the purpose of enriching low-carbon, the method of freezing with low-temperature liquid inert gas (not using liquid nitrogen to prevent condensation of oxygen and methane) is used to remove methane, nitrogen, and oxygen. Although this method completely eliminates the interference of oxygen, it can Directly measure the results of non-methane total hydrocarbons, but cannot get the content of methane
Moreover, the equipment is too complicated, and the operation and calibration process is cumbersome, so continuous analysis cannot be realized. In addition, when the humidity of the sample gas is relatively high, the enrichment tube will freeze and affect the enrichment effect.

Method used

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  • Analysis system and analysis method for methane and non-methane total hydrocarbons
  • Analysis system and analysis method for methane and non-methane total hydrocarbons
  • Analysis system and analysis method for methane and non-methane total hydrocarbons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] use Figure 1-3 The analysis system shown performs sample gas analysis. Among them, the low-carbon separation unit is a stainless steel column with a length of 1.5m and an inner diameter of 4mm, and the column is filled with 60-80 mesh GDX-502 polymer beads; the high-carbon adsorption unit is composed of a quartz glass tube with a length of 8cm and an inner diameter of 1.5mm, and the outer layer is wound with platinum. Heating wire, the tube is filled with 60-80 mesh graphitized carbon black Carbotrap B filler.

[0087] Analysis methods include:

[0088] 1. Sampling;

[0089] 2. For sample injection, the heating temperature for the low-carbon separation unit is 80°C;

[0090] 3. Low-carbon total hydrocarbons are backflushed, and the heating temperature for the low-carbon separation unit is 80°C;

[0091] 4. High-carbon total hydrocarbons are stored, and the heating temperature for the high-carbon adsorption unit is 240°C;

[0092] 5. High-carbon total hydrocarbons ...

Embodiment 2

[0098] use Figure 1-3 The analysis system shown performs sample gas analysis. Among them, the low-carbon separation unit is a stainless steel column with a length of 1.5m and an inner diameter of 4mm, and the column is filled with 60-80 mesh GDX-502 polymer beads; the high-carbon adsorption unit is composed of a quartz glass tube with a length of 8cm and an inner diameter of 1.5mm, and the outer layer is wound with platinum. Heating wire, the tube is filled with 60-80 mesh graphitized carbon black Carbotrap B filler.

[0099] Analysis methods include:

[0100] 1. Sampling;

[0101] 2. For sample injection, the heating temperature for the low-carbon separation unit is 80°C;

[0102] 3. Low-carbon total hydrocarbons are backflushed, and the heating temperature for the low-carbon separation unit is 80°C;

[0103] 4. High-carbon total hydrocarbons are stored, and the heating temperature for the high-carbon adsorption unit is 240°C;

[0104] 5. High-carbon total hydrocarbons ...

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Abstract

The invention relates to an analysis system and analysis method of methane and non-methane total hydrocarbons. The analysis system includes: a multi-channel sampling valve, a quantitative tube, an air pump, a high-carbon adsorption unit, a low-carbon separation unit, and a hydrogen flame ionization detector. The analysis system forms a switchable first state through the multi-channel sampling valve, second state and third state. The analysis system can realize the purpose of continuous complete anaerobic interference accurate analysis and detection of methane and non-methane total hydrocarbons.

Description

technical field [0001] The present invention generally relates to the detection of carbon-containing compounds, in particular to an analysis system and analysis method for methane and non-methane total hydrocarbons. Background technique [0002] In environmental pollution monitoring, the monitoring of volatile organic compounds (VOCs) is generally divided into two categories: total monitoring and characteristic factor monitoring. Among them, total amount monitoring mainly uses total volatile organic compounds (TVOC) and non-methane total hydrocarbons (NMHC) as environmental control evaluation indicators. [0003] Total hydrocarbons, in the relevant environmental protection standards "HJ 604-2017 Determination of Total Hydrocarbons, Methane and Non-methane Total Hydrocarbons in Ambient Air Direct Sampling-Gas Chromatography" and "HJ 38-2017 Total Determination of hydrocarbons in "Gas Chromatography" is defined as "the sum of gaseous organic compounds responding on the hydrog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N30/68G01N30/06
CPCG01N30/06G01N30/68
Inventor 敖小强张云张英平孙焕斌
Owner BEIJING SDL TECH
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