Detection device used for direct measuring of engine tail gas particulate matter number concentration

Abstract

The invention discloses a detection device used for direct measuring of engine tail gas particulate matter number concentration. The detection device comprises an air inlet pipe, a capillary, a connecting pipe, a saturator, a condenser, a middle connecting part, a mixing chamber, an optical particle counter, and a diesel engine particulate matter filter; one end of the connecting pipe is inserted into the middle connecting part, and the air inlet pipe is sleeved with the same end of the connecting pipe; the top part of the air inlet pipe is connected with the capillary; the capillary is inserted into the condenser; the other end of the connecting pipe is communicated with the saturator; the middle connecting part is communicated with the condenser, and is communicated with the saturator; the upper end of the condenser is connected with the mixing chamber; the optical particle counter is connected with the mixing chamber; and the diesel engine particulate matter filter is arranged in the saturator. According to the detection device, influence of volatile substance in engine tail gas is avoided in a simple mode; only solid particulate matter number concentration is detected; and detection cost is reduced.

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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