Emission of gaseous pollutants and water-soluble inorganic ions from civil fuel flue gas
LIU Ya-nan1, ZHONG Lian-hong2, HAN Li-hui1, YAN Jing2
1. Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China; 2. Beijing Municipal Research Institute of Environmental Protection, Beijing 100037, China
Abstract:The typical biomass fuels (made of corn cob, corn stalks, soybean stalks, straw stalks, pine, chestnut branches, peach branches) and civil coal (bituminous coal, honeycomb coal) were selected in Beijing to carry out simulated combustion experiments in the laboratory. The whole-process online monitoring of NOx, SO2 and CO in flue gas was carried out using Thermo Fisher 42i chemiluminescence NO-NO2-NOx analyzer, 43i pulsed fluorescence SO2 analyzer and 48i CO analyzer. The particle samples were collected and the water-soluble inorganic ions in the particles of different particle sizes were measured by ICS 90A and ICS2000ion chromatograph. The results showed that the average emission factors of SO2 from three kinds of civil fuels were civil coal > fuelwood > straw; CO emission factors were straw > civil coal > fuelwood; and NOx emission factors were fuelwood > Civil coal > straw.The content of SO42- in PM2.5 of firewood combustion is the highest, accounting for 22%~30% of the total water-soluble ions. K+ takes an absolute advantage in the composition of water-soluble ions in PM2.5 of straw, accounting for 36%~49% of the total water-soluble ions. Among the three types of civil fuels, straw combustion has the highest emission factor of water-soluble inorganic ions, followed by fuelwood fuel and civil coal. Nine kinds of water-soluble inorganic ions (Na+, K+, Mg2+, Ca2+, NH4+, F-, Cl-, NO3-, SO42-) were analyzed in this experiment. The emission factors of Na+, K+, NH4+, F-from firewood combustion are the largest in the the range of 0~2.5μm, while those of Mg2+ and Ca2+ are the largest in the in the range of 2.5~10μm. Except Ca2+, Mg 2+, the emission factors of other ions from straw fuels reached the maximum in the range of 0~2.5μm particle size. For bituminous coal, except K+, Mg2+ and Ca2+, the emission factors of other ions reach the maximum in the particle size range of 0~2.5μm. The emission factors of Na+, K+, Cl-, NO3-, SO42-in honeycomb coal reach the maximum in the range of 0~2.5μm particle size.
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