摘要
某电厂2台燃用褐煤直流锅炉通过采用烟气余热深度梯级利用与减排系统加热高压给水和凝结水,来提高机组热效率和降低污染物排放量。在不同工况下,对系统投停进行试验对比和运行影响分析。结果表明:投运该系统后,660 MW负荷时实测发电煤耗、供电煤耗分别降低4.97 g/(k W·h)和5.12 g/(k W·h);高负荷时除尘系统出口烟尘排放质量浓度、脱硫工艺用水、送风机及引风机电流等参数降幅较大;单台机组每年产生经济效益约为750万元,设备投资回收期约6年。建议在实际运行中适当增大旁路管径来提高烟气温度,同时增加吹灰频次,以弥补压缩空气旋转除灰系统吹灰能力的不足。
To improve the unit thermal efficiency and reduce pollutants emissions, two once-through lignite boilers in a power plant have adopted the flue gas waste heat deep cascade utilization and emission reduction system to heat the high pressure feed water and hot condensation water. Experimental study and operational effect analysis on the running and stop running system were performed. The results show that, after the flue gas waste heat deep cascade utilization and emission reduction system was put into service, at 660MW, the actual measured coal consumption for power generation and power supply declined by 4.97 g/（kW＇h） and 5.12 g/（kW＇h）, respectively. At high loads, the dust emission concentration, desulfurization process water, draft fan and induced draft fan current decreased greatly. The annual economic benefit of single unit is about 7.50 million yuan, and the payback period of the equipment investment is about 6 years. It is suggested that the bypass diameter be enlarged to increase the flue gas temperature, and the soot blowing frequency be increased to compensate the insufficient soot blowing capability of the compressed air rotary ash removal system.
出处
《热力发电》
CAS
北大核心
2017年第10期94-99,共6页
Thermal Power Generation
基金
中国神华科技项目(SHGF-17-61)~~
关键词
直流锅炉
褐煤
烟气余热梯级利用
经济性
污染物
机组效率
发电煤耗
除尘效率
once-through boiler, lignite, flue gas waste heat cascade utilization, economy, pollutant, unit efficiency, coal consumption for power generation, dust removal efficiency
