Gas dilution device and method based on selection technology

Abstract

The invention provides a gas dilution device and method based on a selection technology. The gas dilution device based on the selection technology comprises a mixing tank, a quantitative ring and a gas separation unit, wherein the first switching module is used for enabling the input end of the quantitative ring to selectively communicate with first gas and second gas; the second switching module is used for enabling the output end of the quantitative ring to selectively communicate with the gas separation unit or the outside; the input end of a non-destructive detector is connected with the gas separation unit, and the output end of the non-destructive detector is connected with a third switching module; the third switching module is used for enabling the outlet of the non-destructive detector to be selectively connected with the mixing tank and the outside; third gas enters the mixing tank through a gas pipeline; and a metering module is used for metering the third gas. The gas dilution device meets the requirement of trace gas dilution.

Description

technical field [0001] The present invention relates to gas dilution, in particular to a gas dilution device and method based on selection technology. Background technique [0002] The concentration of ozone depleting substances in the ambient air is extremely low and relatively stable, usually on the order of 1ppt-1ppb, and the concentration of some components is on the order of 0.1ppt. In the field of environmental monitoring in our country, there is a lack of systematic analysis and monitoring methods and scientific quality control methods. Among them, the key to quality control is the standard gas preparation for such trace concentrations of ozone layer depleting substances. The quality control of such substances is different from the conventional method of monitoring volatile organic compounds in the ambient air. It needs to prepare the corresponding concentration according to the actual concentration of each substance in the ambient air to ensure the accuracy and effe...

AI Technical Summary

Problems solved by technology

[0004] 1. The concentration of a single gas distribution is single, and different concentrations of various species cannot be selectively prepared according to actual needs;

[0005] 2. It needs to consume a large flow of dilution gas for dilution, and the consumption of standard gas is large;

[0006] 3. The dilution ratio is limited and cannot be diluted to ppt level concentration

[0007] Based on the shortcomings of existing dilution devices, each substance can only be prepared with a single concentration, and cannot be prepared to a ppt level concentration standard gas, which cannot meet the scientific monitoring needs of the ozone layer depleting substance system in the ambient air

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