我国中小型燃煤锅炉SO2排放特征与控制对策

 基于87台中小型燃烟煤层燃炉(£70MW)的燃料特性分析数据和SO2排放实测数据,研究了锅炉出力、过量空气系数、燃煤硫含量对燃烧过程中SO2初始排放浓度的影响,分析了燃煤锅炉SO2排放现状,讨论了我国中小型燃煤锅炉SO2排放管理控制的潜力和可行性.结果表明,在锅炉运行负荷³80%的条件下,SO2初始排放浓度与燃煤硫含量之间具有显著的线性相关性,与锅炉出力和过量空气系数无关;分别有94%和87%的实测锅炉可以满足国家现行排放标准规定的第I和第II时段SO2最高允许排放浓度.

Emission characteristics and control measures of SO2 from medium and small coal-fired boilers in China

The influences of boiler output, excess air coefficient, coal sulphur content on SO2 initial emission concentration in coal combustion were investigated by statistical analysis method using SO2 field data and coal analysis data from 87 medium and small layer burning boilers firing soft coal, actual capacity of boilers£70MW. Furthermore the emission status of SO2 from coal-fired boilers was analyzed and the possibility and feasibility of regulatory control of SO2 emissions of medium and small coal-fired boilers in China were also discussed. The results indicate the SO2 initial emission concentrations present a highly significant positive linear correlation with sulphur contents and are not correlated with boiler output and excess air coefficient under the condition of boiler loads³80%. 94% and 87% of all tested boilers can respectively meet the SO2 Maximum Acceptable Emission Concentration (MAEC) for I and II phases prescribed by national emission standard.