Nitrogen dioxide standard gas generating device and method

Abstract

The invention provides a nitrogen dioxide standard gas generating device and method. The nitrogen dioxide standard gas generating device comprises an outer barrel, a cover plate, a heat-conducting sleeve, a nitrogen dioxide permeation tube, a temperature sensor, an electric heating device and a gas channel nipple, wherein the heat-conducting sleeve and the electric heating device are located in the outer barrel; the temperature sensor and the nitrogen dioxide permeation tube are arranged in the heat-conducting sleeve; the nitrogen dioxide permeation tube is provided with a permeable membrane; a sealing ring is arranged between the nitrogen dioxide permeation tube and a cover plate; a through hole is formed in the sealing ring and opposite to the permeable membrane; the gas channel nipple comprises a carrier gas pipeline, a dilution pipeline and a standard gas pipeline; the carrier gas pipeline is provided with a first elbow, while the dilution pipeline is provided with a second elbow; the first elbow and the second elbow are arranged back on to each other; the standard gas pipeline penetrates through the first elbow and the second elbow; one port of the standard gas pipeline extends out of the first elbow and is inserted into the through hole and located on one side of the permeable membrane. The distribution difficulty of the nitrogen dioxide standard gas is reduced and the detection accuracy and stability of the detection equipment are improved.

Description

technical field [0001] The invention relates to a gas generating device, in particular to a nitrogen dioxide standard gas generating device and method. Background technique [0002] Nitrogen dioxide is one of the main pollutants in the atmosphere. Its photolysis is an important source of tropospheric ozone. The reaction product of nitric acid with hydroxyl radicals is one of the main causes of acid rain. It can also be free from organic peroxide in the atmosphere. base reaction to generate organic nitrogen compounds causing regional environmental problems. Nitrogen dioxide has a stimulating effect on the human respiratory system and can induce bronchitis, asthma and other respiratory diseases. Nitrogen dioxide in the atmosphere mainly comes from man-made pollution such as fossil fuel combustion, automobile exhaust and industrial exhaust gas. Early warning, and help to formulate reasonable urban planning and construction are of great significance. However, due to the stron...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is: to provide a nitrogen dioxide standard gas generating device and method, which can solve the defects of difficult gas distribution, low precision and poor stability of low-concentration nitrogen dioxide standard gas in the prior art, and realize the The nitrogen standard gas generator provides convenience for the rapid and accurate calibration of atmospheric nitrogen dioxide on-site detection equipment, so as to reduce the difficulty of gas distribution of low-concentration nitrogen dioxide standard gas and improve the detection accuracy and stability of the detection equipment

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