Quick analysis method of fuel gas component and gas chromatography system thereof

Abstract

The invention discloses a gas chromatography system containing four pillars, three valves and double detectors, and a method for quick analysis of multiple fuel gases by the system. Only by one sampling, analysis of light hydrocarbon, heavy hydrocarbon and inorganic gas in every fuel gas can be rapidly completed. After sampling, a ten-way valve is switched to an analysis state, and a sample in a first sample pipe enters a SE-30 column; after inorganic gas and light hydrocarbon flow out, the ten-way valve is switched again to reversely blow the heavy hydrocarbon in the column out of the SE-30 column; inorganic gas and light hydrocarbon enter the PQ column again, carbon dioxide flows out firstly, and the other inorganic gas and light hydrocarbon flowed out latter enter a 5A chromatographic column and then orderly enter TCD (thermal conductivity detector) to detect. A sample in the second sample tube enters the Al2O3 column and then enters FID to realize the separation and testing of the heavy hydrocarbon component. The inorganic gas, the light hydrocarbon, heavy hydrocarbon of multiple fuel gases are effectively separated, and three sets of data are assembled on one spectrogram, thus the fuel gas component analysis and calorific value are quickly completed through one sampling.

Description

technical field [0001] The invention belongs to the technical field of analysis and testing, and in particular relates to a rapid analysis method for gas components and a gas chromatography analysis system thereof, in particular, the combination of multiple chromatographic columns and double detectors, and the gas path cutting-back blowing technology are used to realize various A method for fast and accurate analysis of gas components. Background technique [0002] With the increasingly severe smog weather in large and medium-sized cities in my country and the continuous strengthening of the government's efforts to control smog, the domestic consumption of conventional and unconventional natural gas in clean energy has increased sharply. In 2016, my country's natural gas consumption reached 205.8 billion cubic meters, but its natural gas production was only 137.1 billion cubic meters. Therefore, my country still needs a large amount of imported pipeline natural gas and lique...

AI Technical Summary

Problems solved by technology

[0007] Generally speaking, the weak point of above-mentioned prior art method is: (1) need two or more than two sets of analysis equipments, need multiple sample injections, analysis is loaded down with trivial details, analysis time is long, and analysis efficiency is not high; (2) ) needs to prepare multiple bottles of gas standard samples; (3) the separation effect of hydrogen and helium is not good; (4) it can only be used for the analysis of conventional natural gas or specific gas and LPG, and the analysis effect of other new types of gas is not good

[0008] In "Application of a Multifunctional Gas Chromatograph in Natural Gas Analysis" ("Petroleum and Natural Gas Chemical Industry", 2010, 39(6): 531-532), Yang Yingsheng et al. introduced a relatively independent three-way carrier gas composition. Separation system; the inventors of the present invention, Wang Shaonan and others, previously proposed a method for rapid analysis of natural gas that adopts two-way gas path processes and has the principle of gas path backflushing in the patent application CN102141557A "A Rapid Analysis Method for Composition of Compressed Natural Gas". However, in these two methods, carbon dioxide enters the molecular sieve column together with hydrogen, oxygen, nitrogen, helium and light hydrocarbon components, and carbon dioxide is easy to cause damage to the molecular sieve column and shorten the service life of the equipment; The whole component sample enters the separation column, which has a great impact on the separation column, and the separation takes a long time; the latter method uses a thermal conductivity detector to analyze the trace heavy hydrocarbon components in natural gas, which has low sensitivity, and the calculation of the calorific value of different natural gases will produce certain error

Images