Differential total scattering suspended particle concentration monitoring device and its use method and application

Abstract

The invention discloses a differential full-scattering suspended particle concentration monitoring device and its use method and application. The differential full-scattering suspended particle concentration monitoring device includes an air circuit circulation system and an optical path detection system; the air circuit circulation system also includes an exhaust suction unit for maintaining a constant fluid flow in the air circuit, and a device connected to a particle size classifier. Neutralizing charge; the inlet section of the particle size classifier includes the sheath gas inlet and the tail gas inlet connected to the neutralizing charge; the outlet section includes the gas outlet to be detected coaxially distributed with the sheath gas inlet; the optical path detection system is connected to the detection chamber , to realize the detection of light intensity in the detection chamber. The use method is to calculate the concentration of particles with a specific particle size settled within the voltage range according to the light intensity attenuation under different voltages. The application described is the application in monitoring the particle size distribution and concentration of suspended particulate matter in industrial tail gas. The invention has the advantages of wide application, low cost, and especially low requirements for gas temperature and humidity.

Description

technical field [0001] The invention relates to the technical field of industrial tail gas monitoring, and more specifically, to a differential full-scattering suspended particle concentration monitoring device and its use method and application. Background technique [0002] In recent years, the air quality has been deteriorating day by day, and the source analysis of air particulate matter shows that the particulate matter produced by industrial production and coal combustion accounts for 20-30% of the atmosphere. On July 18, 2011, the Ministry of Environmental Protection of China and the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China jointly issued the latest "Emission Standards of Air Pollutants for Thermal Power Plants (GB13223-2011)", pointing out that for coal-fired power plants, the concentration of particulate matter in the exhaust gas should be increased from 50mg·Nm -3 (Emission standard of air pollutants...

AI Technical Summary

Problems solved by technology

However, due to the defects in the monitoring principle, on the one hand, because the particles need to be condensed and crystallized to count, the device has to be monitored in a narrow temperature range (15-35°); on the other hand, the monitoring object is High concentration of suspended particles, and it adopts the method of particles flowing out from the narrow gap, which is very easy to be blocked under the working conditions of frequent alternation of cold and heat and high humidity

Even if a good working environment is provided for it in the experimental environment, it still has the above defects. If it is applied to the monitoring of industrial exhaust gas with harsh environment, high temperature and high humidity and high concentration of suspended particulate matter, it will definitely not be realized.

In addition, the equipment is expensive. The price of one piece of equipment is hundreds of thousands of yuan. The cost is too high to become the equipment choice of most enterprises, and it is impossible to carry out research and promotion of industrial exhaust suspended particulate matter removal.

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