SO2 Emission Characteristic of Pulverized Coal Combustion in O2/CO2 Atmosphere
In order to study SO2 emission characteristic of pulverized coal combustion in O2/CO2 atmosphere, this paper analyzes influence of excess air coefficient, CO2 volume fraction, furnace temperature and fuel ratio on SO2 emission characteristic at the time of single coal combustion and mixed coal combustion by simulating actual condition of mixed coal combustion in the power plant. Results show that excess air coefficient increases from 0.8 to 1.4 and the higher SO2 emission mass concentration (thereafter as emission concentration) is, the lower CO emission concentration is. SO2 emission concentration in O2/CO2 atmosphere which has decreased 10% is less than that in O2/N2 atmosphere. As CO2 volume fraction in reaction atmosphere increases from 20% to 50%, SO2 emission concentration gradually reduces while CO emission concentration gradually increases. With rise of furnace temperature, SO2 emission concentration in O2/CO2 and O2/N2 atmosphere both increases while changes of SO2 emission concentration curve slopes in different atmosphere and temperature rise time periods are different. In addition, the less fuel ratio is, the better combustion of pulverized coal is and the higher conversion percentage of S to SO2 in fuel is. In high temperature and enriched oxygen atmosphere, the higher S content in fuel is, the higher SO2 emission is , but conversion percentage of S to SO2decreases.
O2/CO2 atmospherepulverized coal combustionmixed combustionfuel ratioemission concentrationoxygen-enriched combustionexcess air coefficient
国家科技期刊平台
NSTL
万方数据
维普
