Dynamic generator for multicomponent low-concentration standard gas

Abstract

The invention relates to a dynamic generator for multicomponent low-concentration standard gas, and belongs to the field of the generation of standard gas. According to the dynamic generator, a carrier gas source outlet is connected with a humidification tank by a pipeline; the humidification tank is connected in parallel at the inlet end and the outlet end of a bypass valve; a microporous humidification head is arranged in the humidification tank and is connected with the outlet end of a first flow controller and the inlet end of the bypass valve simultaneously by the pipeline; a polluted gas source is connected with a gas collector by the pipeline, and a flow controller is arranged on the connected pipeline for connecting the polluted gas source and the gas collector; a capillary sprayer is arranged in the gas collector; a liquid injection pump is connected with the capillary sprayer in the gas collector; and a constant temperature heating sleeve is wrapped outside the gas collector. According to the dynamic generator, due to the adoption of a mode of the liquid injection pump, the proportioning of multiple organic pollutants is realized simply and accurately, and the multicomponent low-concentration standard gas with the concentration ranging from 0.01 to 20 mg / m<3> can be generated simultaneously. The dynamic generator can be applied to multiple fields of scientific research, environment, chemistry, chemicals and the like.

Description

technical field [0001] The invention relates to a multi-component low-concentration standard gas dynamic generating device, which belongs to the field of standard gas generation. Background technique [0002] Indoor air quality significantly affects people's comfort, health and work efficiency, and has attracted more and more attention. The high concentration of volatile organic compounds (VOCs) released by indoor objects and decoration materials is one of the main reasons for poor indoor air quality. In order to ensure a safe and comfortable indoor environment, many air purification materials are widely used in indoor environments, such as activated carbon adsorption materials, nano-titanium dioxide photocatalytic materials, room temperature thermocatalytic materials, etc. Therefore, it is very important to test the performance of these air purification materials. A common detection method is to first configure a constant concentration of pollutant gases, and then evaluat...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a multi-component low-concentration standard gas dynamic generator to overcome the deficiencies of the existing polluting gas dynamic generator method, and use a liquid injection pump to generate 0.01-20 mg / m with low cost and high precision. 3 Multi-component low-concentration gas in the concentration range, to obtain the required concentration of multi-component low-concentration standard gas

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