System and method for measuring carbon dioxide, methane and nitrous oxide in air simultaneously

Abstract

The invention discloses a system and a method for measuring carbon dioxide, methane and nitrous oxide in air simultaneously. In an analysis part, a gas sample enters a sample introduction unit; a separation unit is connected with the sample introduction unit, and the gas sample enters the separation unit to be separated under the drive of carrier gas through the state change of the sample introduction unit; a detection unit is connected with the separation unit, and the separated sample enters the detection unit to be detected; and a switching unit is connected with the separation unit and the detection unit, and sample components are selectively emptied or detected through the state change of the switching unit. In a drive part, two electronic switches are respectively connected with two electromagnetic valves through electric wires, the air inlets of the two electromagnetic valves are connected with compressed air, and the two electromagnetic valves are respectively connected with a drive cylinder of a pneumatic valve of the sample introduction unit and a drive cylinder of a pneumatic valve of the switching unit through three-way joints; and the electronic switches are regularly switched on or off to change the flow direction of the compressed air in the electromagnetic valves so as to finish the state switching of the sample introduction unit and the switching unit.

Description

technical field [0001] The invention relates to a system and method for quickly measuring the content of three main greenhouse gases (carbon dioxide, methane and nitrous oxide) in the atmosphere at the same time, and is especially suitable for the business monitoring of atmospheric greenhouse gas concentration in meteorological and environmental departments or for scientific research units to use in greenhouses. Gas emission measurement. Background technique [0002] It has become an indisputable fact that the increase in the concentration of greenhouse gases in the atmosphere leads to global warming, and my country is facing severe challenges in the diplomacy of reducing greenhouse gas emissions. carbon dioxide (CO 2 ), methane (CH 4 ) and nitrous oxide (N 2 O) are the three most important long-lived greenhouse gases in the atmosphere, and their global warming shares are 63%, 15% and 7%, respectively. To formulate emission reduction measures, long-term monitoring of gre...

AI Technical Summary

Problems solved by technology

Usual gas chromatography analysis of N 2 When O, only one chromatographic column is used, and the accumulation of water vapor and chlorofluorocarbons in the chromatographic column will gradually increase the chromatographic baseline and sharply reduce the sensitivity and stability of the ECD. The aging and cleaning of the column and detector must be performed to Continue the experiment, the analysis time is long, and it is difficult to perform continuous measurement

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