A detection device for directly measuring the number concentration of engine exhaust particulate matter

Abstract

The invention discloses a detection device for directly measuring the number concentration of engine exhaust particulate matter, comprising an intake pipe, a capillary tube, a connecting pipe, a saturator, a condenser, an intermediate connector, a mixing chamber, an optical particle counter and a diesel engine particulate matter filter, wherein, One end of the connecting pipe is inserted into the intermediate connector, at this end, the air inlet pipe is sleeved in the connecting pipe, the top of the air inlet pipe is connected to the capillary, and the capillary is inserted into the condenser, The other end of the connecting pipe communicates with the saturator, the intermediate connector communicates with the condenser, and communicates with the saturator, the upper end of the condenser is connected to the mixing chamber, and the optical particle counter is connected to The mixing chamber and the diesel particulate filter are arranged inside the saturator. The invention uses a simple method to remove the influence of volatile substances in the exhaust gas of the engine, and only measures the number concentration of solid particles in the exhaust gas, thereby saving detection cost.

Description

technical field [0001] The invention relates to the field of environmental monitoring equipment, in particular to a detection device for directly measuring the number concentration of engine exhaust particles. Background technique [0002] Particulate matter emitted by motor vehicles is an important source of particulate matter in the atmospheric environment. The number concentration of engine exhaust particulate matter has a three-peak distribution according to particle size, nucleated particles (<50nm), aggregated particles (50nm—500nm), and coarse particles (>500nm). In the engine exhaust, the mass of nucleated particles only accounts for 0.1%-10% of the particle mass, but accounts for 90% of the total number. Although the mass weight of nucleated particles is low, they account for the majority of the total particle number. Particles mainly detects the number of nucleated particles. And studies have shown that compared with large particles, fine particles are more...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a detection device that can directly measure the concentration of engine exhaust particulate matter, so as to solve the technical problem that the existing device needs to add volatile substance removal equipment to accurately measure. The device can accurately count solid particles, And effectively reduce the complexity and detection cost of the detection device

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