Automatic-regulating discharged particulate matter dilution sampling device

Abstract

The invention discloses an automatic-regulating discharged particulate matter dilution sampling system; the system includes a dilution air regulating unit, a diluter unit, a particulate matter sampling unit and a signal conditioning and acquisition unit, and the dilution air regulating unit includes a high-efficiency particulate matter filter purifier, a pressure limiting valve, a flow controller and an electric heater, and is used for regulating the dilution air flow and temperature; the diluter unit is an air and sampling gas staying room with a thermal insulation material; the particulate matter sampling unit includes an optical fiber filter paper clamp and a three-way valve which is only used when other test system is needed to be connected); the signal conditioning and acquisition unit comprises sensor data acquisition, signal processing, data acquisition card, and PC (personal computer) LabVIEW (laboratory virtual instrumentation engineering workbench) data acquisition and PID (proportion integration differentiation) control programs. The automatic-regulating discharged particulate matter dilution sampling system is high in degree of automation, can realize the physical and chemical property analysis of particulate matters by filter paper collection, also can be in combined use with other detection instruments such as SMPS (scanning mobility particle sizer), DMS500 (difference mobility sizer) and the like, and is suitable for PM2.5 (particulate matter2.5) detection occasion with strict requirements on dilution conditions.

Description

technical field [0001] The invention relates to a device for automatically adjusting the dilution and sampling of discharged particulate matter, which can accurately control the dilution ratio and the temperature of the diluted gas by adopting the automatic adjustment PID control mode, and satisfies the strict requirements on the dilution conditions for particle testing proposed by the European Union and the United States, and belongs to the field of environmental monitoring. . Background technique [0002] Particulate matter emitted from various combustion sources (such as motor vehicles, aircraft, coal plants, etc.) is an important source of particulate matter in the atmospheric environment. Collecting and analyzing the physical and chemical properties and particle number concentration of particulate matter is of great significance for proposing atmospheric particulate matter pollution control measures and formulating reasonable and standardized particulate matter testing ...

AI Technical Summary

Problems solved by technology

[0004] At present, the particle dilution and filtration sampling systems developed by Chinese scholars generally only perform dilution and sampling, without adding an automatic control system, so the system can only work under manual operation, and the dilution parameters fluctuate during the collection process Uncontrollable, poor stability, and less accurate data

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