Device and method for dehumidifying atmospheric particulate matter

Abstract

The invention relates to an atmospheric-particulates dehumidifying apparatus and a method. The atmospheric-particulates dehumidifying apparatus comprises a Nafion tube dehumidifying unit, a particle characterstic measuring unit, a particle purifying unit and a sucking pump. The atmospheric-particulates dehumidifying method is based on a Nafion tube dehumidifying principle, steam in a to-be measured sample gas is removed through a low-pressure high-flow-velocity drying gas blowing process, and lossless non-contact continuous dehumidifying of atmospheric particulates is realized. In order to guaranteeing the cleanliness of the blowing gas, the method firstly employs an inertia bumping manner for removing particles with micrometer-grade particle size in the blowing gas, and then removing nanoscale fine particles in the blowing gas by combining field ionization charging and electrostatic traction. The method also utilizes a process of combining a flow-limiting valve and a large-power suction pump, and thus the blowing gas pressure is lower than a sample gas pressure, and the drying efficiency of the whole atmpospheric-particulates dehumidifying apparatus is substantially improved.

Description

technical field [0001] The invention relates to the technical field of atmospheric aerosol monitoring, in particular to an atmospheric particle dehumidification device and method. Background technique [0002] In recent years, haze events have occurred frequently at home and abroad, and high concentrations of ozone and fine particle (PM2.5) pollution have become the main pollution characteristics of the current atmosphere. With the promulgation of the national PM2.5 air quality standard, the demand for measuring instruments such as the mass concentration of various fine particles at home and abroad has greatly increased. Humidity control has become one of the key issues affecting the measurement accuracy of the instrument. Therefore, various instrument manufacturing companies have adopted various methods to reduce the humidity of the particle sample gas. [0003] For the humidity control of particulate matter, desiccant adsorption dehumidification or heating dehumidificatio...

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Problems solved by technology

However, since the remaining dry air after being dehumidified by the dehumidification pipe flows back into the gas return channel without passing through any particle purification device, the outer wall of the inner drying pipe will be polluted after long-term operation, thereby reducing the drying efficiency; at the same time, in this In this working mode, the return (purge) air flow rate is much lower than that of the air to be dried, and it is difficult to achieve long-term efficient dehumidification even under the condition of a fixed pressure difference

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