Sample gas intake system for on-line gas chromatographic detection

Abstract

The invention discloses a sample gas intake system for on-line gas chromatographic detection. According to the invention, the gas inlet end of a sampling pump is connected with a gas source, and the gas outlet end of the sampling pump is connected with a first gas inlet of a reversing valve assembly; the gas inlet of a quantitative sample gas storage unit is connected with the first gas outlet ofthe reversing valve assembly, and the gas outlet of the quantitative sample gas storage unit is connected with the second gas inlet of the reversing valve assembly; the second gas outlet of the reversing valve assembly is connected with a first exhaust port via a buffer tank; a carrier gas pipeline is connected with the third gas inlet of the reversing valve assembly; and the third gas output of the reversing valve assembly is connected with a detection unit. The sampling pump pumps sample gas to the quantitative sample gas storage unit, and the quantitative sample gas storage unit is connected with the buffer tank, so the sample gas in the quantitative sample gas storage unit has good stability; and switching of closed circuits is carried out via the reversing valve assembly, and the sample gas with stable pressure is conveyed to the detection unit by the carrier gas for detection, so accurate detection results can be obtained.

Description

technical field [0001] The invention relates to a gas pressure balance design, in particular to an online gas chromatograph, which is used in the field of gas analysis. Background technique [0002] In the current commonly used online gas chromatography analysis process, there are mainly the following deficiencies: [0003] 1. The sampling pump is directly used to drive the sample gas injection, and the pressure of the chromatograph’s sample gas fluctuates greatly, resulting in large fluctuations in the standard sample volume and unstable measurement data; [0004] 2. During the online gas chromatography analysis process, the air permeability of the filter in the pretreatment changes with time, which causes the sample gas pressure to change when the chromatograph enters, and the measurement data changes accordingly; [0005] 3. Some sampling pumps use the start-stop method for pressure balance, and the sampling pump is easy to be damaged; on the other hand, the sample gas s...

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Problems solved by technology

[0005] 3. Some sampling pumps use the start-stop method for pressure balance, and the sampling pump is easy to be damaged; on the other hand, the sample gas sampling will lag

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