摘要
为研究循环流化床锅炉炉内石灰石脱硫+炉外烟气循环流化床半干法脱硫除尘一体化系统在不同负荷下,锅炉出口和布袋除尘器出口烟气中SO2和SO3质量浓度的变化规律,对某300 MW循环流化床锅炉进行了试验研究。结果表明:锅炉出口原烟气中SO2质量浓度随锅炉负荷的增加而减小,SO3质量浓度随锅炉负荷的增加而增大;在炉内氧过量及二次风分级送入的情况下,炉温和流化速度是影响炉内SO3质量浓度的重要因素,导致在大于75%锅炉负荷后SO3质量浓度增加趋势明显增大,100%锅炉负荷时达到18.5 mg/m3;在炉外烟气半干法循环流化床脱硫除尘一体化系统中,消石灰、再循环脱硫灰、工艺水等的协同作用使净烟气中SO3质量浓度降至1.4 mg/m3以下,表明炉外半干法循环流化床脱硫除尘一体化工艺具有良好的负荷适应性和脱除能力。
To study the variation law of SO2 and SO3 concentration in the flue gas at outlet of a 300 MW circulating fluidized bed(CFB) boiler and its bag filter, where in-furnace limestone desulfurization and external semi-dry desulfurization combined with dust removal were adopted at different loads, experimental tests were conducted. Results show that with the increase of boiler load, the SO2 concentration in raw outlet gas of boiler decreases, while the SO3 concentration increases. In the presence of excess oxygen in the boiler and under the grading supply of secondary air, both the furnace temperature and fluidizing velocity are the main factors influencing the in-furnace SO3 concentration, leading to the obvious increase in SO3 concentration at the load above 75%, which gets up to 18.5 mg/m3 at 100% load. For the external flue gas sulfur/ash removal system, the combined action of slaked lime, desulfurization ash recycling as well as process water helps to reduce the SO3 concentration to be below 1.4 mg/m3, indicating high sulfur/ash removal ability and good load adaptability of the integral semi-dry CFB system.
作者
李东雄
徐鸿恩
牛拥军
郑立星
韩豪杰
程芳琴
LI Dongxiong;XU Hong'en;NIU Yongjun;ZHENG Lixing;HAN Haojie;CHENG Fangqin(Department of Power Engineering,Shanxi University,Taiyuan 030013,China;Shanxi Guofeng Coal-Power Co.,Ltd.,Fenyang 032200,Shanxi Province,China;Xi'an Thermal Power Research Institute Co.,Ltd.,Xi'an 710054,China;Institute of Resources and Environment Engineering,Shanxi University,Taiyuan 030006,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2020年第6期447-453,共7页
Journal of Chinese Society of Power Engineering
基金
山西省煤基低碳科技重大专项资助项目(MD2015-04)。
关键词
循环流化床锅炉
炉内脱硫
半干法
协同脱除
SO3排放
CFB boiler
in-furnace desulphurization
semi-dry method
simultaneous removal
SO3 emission
