High-temperature aerosol particle sampling gun

Abstract

A high-temperature aerosol particle sampling device belongs to the technical field of coal combustion and environmental pollution emission and comprises two parts of a sampling head and a gun body, wherein the sampling head consists of a sampling nozzle, a diluent gas heating pipe and a mixing channel, and the gun body comprises a water cooled shell assembly and a two-stage diluent mixing tube. Aiming at the complicated conditions of a high temperature combustion environment, the device inhibits the condensation and nucleation of gaseous inorganic substances in high temperature smoke gas during sampling process through two-stage diluent sampling, and meanwhile, holds back the collision and conglobation process of particles during sampling process, thus obtaining the real distribution of particulate matter in the high temperature smoke gas. The sampling device is applicable to sampling of aerosol particulate matter under high temperature environment (such as various combustion apparatuses).

Description

technical field [0001] The invention relates to a high-temperature aerosol particle sampling gun, which belongs to the technical field of coal combustion and environmental pollution discharge. Background technique [0002] The particulate matter sampling system in high temperature environment is very important for studying the formation mechanism and emission of inhalable particulate matter during the combustion of fossil fuels and biomass, and for studying the formation of nanoparticles in combustion synthesis. However, in a high-temperature environment, it usually contains gaseous inorganic minerals and gaseous reactants, and these substances will undergo a series of dynamic physical and chemical processes during the sampling cooling process, that is, condensation and formation of new particles will occur during the cooling process of the gas temperature , or condense to the original particles, thus affecting the original particle phase. Therefore, these processes need to...

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Problems solved by technology

[0003]However, the existing high-temperature particle sampling devices either use water-cooled tube walls and vacuum pump extraction methods, or add diluent gas at the sampling inlet. This high-temperature particle sampling method is difficult Ensure the distribution and characteristics of the particulate matter in the high-temperature environment, especially for fine particulate matter (aerodynamic diameter less than 10 μm), the existing sampling methods and equipment cannot freeze the physical and chemical properties of gaseous inorganic minerals in the high-temperature environment during the sampling process reaction, thereby changing the characteristics of fine particles

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