PAN gas generation system and method

Abstract

The invention relates to a generation system of PAN (peroxyacetyl nitrate) standard and a method. The system comprises a reaction bin, an NO source, an acetone source and an ultraviolet lamp, wherein the reaction bin is provided with a gas inlet and a gas outlet, the acetone source is accessed in the gas inlet through a first pipeline and is connected with a first quality flow controller, and theacetone source is accessed in the gas inlet through a second pipeline and is connected with a second quality flow controller; the ultraviolet lamp is arranged outside the reaction bin, and the acetone and the NO are pumped in the reaction bin for ultraviolet irradiation. In the method, through the control of the two quality flow controllers, suitable NO and excessive acetone are pumped in the reaction bin; under the irradiation of the ultraviolet lamp, the NO fully participates in a reaction for generating the PAN so as to further calculate the concentration of the generated PAN standard according to the flow of the NO. The invention provides a PAN standard source for a PAN detector to realize online calibration, save experimental cost, lower operation complexity, and provide accurate response factors for the concentration of the PANs (peroxyacetyl nitrate standard) in atmosphere.

Description

technical field [0001] The invention relates to the field of environmental quality monitoring, in particular to a PAN standard gas generation system and method for PAN online detection instruments or conventional PAN detection instruments. Background technique [0002] Peroxyacetyl nitrate (PAN) is an important product of atmospheric photochemical pollution. With the increasing number of motor vehicles in my country's cities, photochemical smog pollution is becoming more and more serious. The detection of PAN concentration, which is an important indicator of atmospheric oxidants, is very important. Due to the difficulties in PAN concentration detection technology: the concentration of PAN substances in the atmosphere is low and it is easy to decompose when heated, so it cannot be stored for a long time at room temperature. Although it can be enriched by liquid nitrogen condensation and enriched, the operation is complicated and continuous detection is not possible. , so the ...

AI Technical Summary

Problems solved by technology

However, many standard gases rely on foreign imports or are generated by imported equipment, which is expensive

Coupled with the poor stability of PAN, there is currently no standard sample of PAN to provide

[0004] Instead of relying on foreign imports or using imported equipment to generate PAN standard gas, the traditional method of generating PAN standard gas from volatile sources, that is, the method of chemical synthesis, has many disadvantages and is not suitable for real-time and accurate detection of the atmosphere

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