Study on emission characteristics and field measurement of PM2.5 in coal-fired power plant boilers
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Abstract:
Field experiments and chemical composition analysis of particle in flue gas from several coal-fired power plants in Guanzhong area of Shaanxi province was carried out with dilution and collection system of PM2.5 in stationary sources designed by the team. The results show that the proportions of PM2.5 and PM10 in the particles of 4 coal-fired power plants are quite different. The proportion of PM2.5 ranges from 6.92% to 54.34%, and the proportion of PM10 ranges from 36.36% to 73.02%. Maximum values (2.0×104 to 4.0×105/cm3) of number concentration levels from 4 coal-fired power plants are quite different, and the difference is about 1 order of magnitude. The mass concentration proportion of small particles to PM2.5 from coal-fired power plants is mostly low, but the small particles' contribution to PM2.5 number concentration is great (minimum value > 95%), and the situation of the large particles is quite the opposite. The PM1/PM2.5 value of the pulverized coal boiler is large, the ratio range is between 35.29% and 51.35%, and the PM1/PM2.5 value of the circulating fluidized bed boiler is small, the ratio range is between 16.62% and 21.47%. SO42- is the most abundant ion component in PM2.5 of coal-fired power plants, and the proportion of SO42- to total ion concentration ranges from 50.02% to 65.52%, Na+ and Ca2+ ranking second or third. The main inorganic elements detected in the coal-fired power plants are Si, Al, Ca, Na, Fe, Na and other crustal elements. The emission factors' range of PM2.5, PM10 and particles in the coal-fired power plants are 0.001 to 0.028 kg/t, 0.002 to 0.086 kg/t and 0.003 to 0.236 kg/t, respectively. The more complex and advanced the combination of dust removal facilities is, the smaller the emission factor is likely to be.
