Method for rapidly analyzing components of compressed natural gas

A technology for compressing natural gas and analysis method, applied in the field of analysis and testing, can solve problems such as poor separation of helium and hydrogen components, and achieve the effect of high analysis efficiency

Inactive Publication Date: 2011-08-03
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Abstract
  • Description
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Problems solved by technology

[0010]l The separation of helium a

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  • Method for rapidly analyzing components of compressed natural gas
  • Method for rapidly analyzing components of compressed natural gas
  • Method for rapidly analyzing components of compressed natural gas

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Embodiment 1

[0076] The following describes the analysis of a CNG sample analysis of the Gas Products Supervision and Inspection Station of Guizhou Province in conjunction with the accompanying drawings.

[0077] Two thermal conductivity detectors and three columns were used in this analysis. The two detectors are named A and B detectors respectively; among them, detector A has higher sensitivity and mainly completes the analysis of hydrocarbons and carbon dioxide in the sample; detector B has lower sensitivity and mainly completes the analysis of helium, hydrogen, oxygen and nitrogen in the sample. analysis.

[0078] The three chromatographic columns are named as A1, A2 and B columns respectively, the A1 and A2 columns are used with the detector A, and the B column is used with the detector B. Among them, A1 column is 0.6m long, filled with 80 / 100 mesh VZ-7; A2 column is 5.5m long, filled with 80 / 100 mesh VZ-7; B column is 3m long, filled with 40 / 60 mesh 13X molecular sieve treated as fo...

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Abstract

The invention discloses a method for analyzing components such as helium, hydrogen, oxygen, nitrogen, methane, ethane, carbon dioxide, dimethylmethane, iso-butane, n-butane, isopentane, n-pentane, n-hexane and heavier components in compressed natural gas (CNG) by adopting a double thermal conductivity gas chromatograph, utilizing the principles of predissociation and gas circuit back flushing, applying the negative peak and channel switching function of a chromatographic workstation and adopting one-step sample injection. The analysis method is improved based on an analysis method provided by American Society for Testing Material and the current national standard. By adopting the analysis method disclosed by the invention, the problems that multiple sample injection is required and the analysis efficiency is lower when the components of the CNG are analyzed in the prior art can be solved.

Description

technical field [0001] The invention belongs to the technical field of analysis and testing, and in particular relates to an analysis method using a special gas path flow. Background technique [0002] Background Technology 1: Domestic Status [0003] At present, there is no one-time injection of helium, hydrogen, oxygen, nitrogen, methane, ethane, carbon dioxide, propane, isobutane, n-butane, isopentane, n-pentane, n-hexane and other components in compressed natural gas (CNG). A method for the rapid analysis of heavier components. At present, most of the analysis methods used in China are the implementation of the national recommended standard (GB / T) 13610-2003, gas chromatography for composition analysis of natural gas. The method stipulated in this standard uses 3 chromatographic columns and 4 valves to manually switch for analysis. The three chromatographic columns used are: chromatographic column 1: Squalance, Chromosorb P AW, column length 3m; column 2: Porapak N, 2...

Claims

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Application Information

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IPC IPC(8): G01N30/60G01N30/02
Inventor 王少楠周鹏云张军陈雅丽代高立
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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