Abstract
Aiming at the problem of soot concentration measurement under ultra-low emission conditions, a forward small angle soot concentration measurement method is proposed. Taking a typical boiler emission of 0.1 μm–3.0 μm bimodal distribution soot as an object, the particle scatter simulation calculation under different parameters is carried out, and the influence of detection angle and particle size on the angular scattering measurement of ultra-low emission soot is analyzed. The influence of detection angle and particle size on the angular scattering measurement of ultra-low emission soot is analyzed. Preferably, the wavelength of incident light is 650 nm, and the forward detection angle parameter is 15° for the design of forward small angle soot concentration measurement system. An experimental system for measuring soot with standard concentration is built. Experiments of particle concentration measurement of 1.0 μm and 3.0 μm under ultra-low emission conditions are carried out. The results show that the average deviation of soot concentration measurement is less than 0.10 mg/m3 under the condition of ultra-low emission by using 15° of forward detection, which provides an effective way for monitoring ultra-low emission soot concentration in coal-fired power plants.
Highlights
With the implementation of ultralow emission transformation in coal-fired power plants, the soot emission concentration has been greatly reduced, which puts forward higher requirements for soot concentration monitoring technology
The forward angular scattering method is more applicable to the monitoring of ultra-low emission flue gas from coal-fired power plants with particle size of 0.1–3.0 μm and concentration of less than
In order to obtain the concentration of bimodal distribution characteristic of soot particles within the range of 0.1 μm–3.0 μm at the same time, combined with the above 0.1 μm and 3.0 μm particle scattering light intensity distribution characteristics, the soot concentration monitoring of 0.1 μm–3.0 μm particle size bimodal distribution characteristic under ultra-low emission conditions should select 10◦–20◦ forward small angle detection
Summary
Coal-fired pollution has become one of the main sources of air pollution, which seriously effects the regional ecological environment, and poses a great threat to human health [1]. The forward angular scattering method is more applicable to the monitoring of ultra-low emission flue gas from coal-fired power plants with particle size of 0.1–3.0 μm and concentration of less than
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