Method for measuring mass concentration of particulate matter

Abstract

The invention relates to a method for measuring the mass concentration of a particulate matter. A processor controls a sampling pump so that airflow enters from a particulate matter collecting unit, atmospheric particulate matter information is acquired, whether an instrument needs to be calibrated is judged, a beta-ray calibration module is started to calibrate the parameter values of a light scattering measurement module if calibration is needed, and the light scattering measurement module is turned on after the parameters are calibrated; and if calibration is not needed, the light scattering measurement module directly carries out measurement. By combining a light scattering method for measuring the concentration of the particulate matter with a beta-ray method, the measurement is accurate and data are directly read on line in real time; the beta-ray calibration module and the light scattering measurement module share one gas path, so as to ensure that various conditions in the calibration process are consistent and reduce error factors; and the parameters of the light scattering measurement module are calibrated by using the beta-ray calibration module when the measurement environment is changed, and the light scattering measurement module is separately utilized to measure the concentration of the particulate matter when the measurement environment is not changed.

Description

Technical field [0001] The invention relates to a method for measuring the mass concentration of particulate matter, and belongs to the field of particulate matter concentration measurement. Background technique [0002] Due to the serious environmental pollution caused by pollution sources such as industrial boilers, power plant boilers, and industrial kilns, countries all over the world have conducted in-depth research and control on this, which requires the detection of the concentration of particulate matter and dust emitted by them. At present, the commonly used detection methods include light scattering method, β-ray absorption method, opacity method, light transmission method and so on. [0003] The principle of the light scattering method is: the light beam from the light source irradiates a certain space (measurement area) containing the particles to be measured, so that scattering occurs. The scattered light is converted into an electrical signal by a photoelectric receiv...

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Problems solved by technology

[0005] Other methods such as opacity method and light transmission method also have the above problems. At present, there is no method that can not only avoid the influence of environmental particles, frequently calibrate the parameter values, but also read the particle concentration value online in real time.

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