摘要
排烟热损失是锅炉各项热损失中最大的一项,影响排烟热损失的主要因素是排烟温度。电站锅炉在尾部烟道加装低温省煤器,利用排烟余热加热凝结水,可以降低脱硫系统的入口烟温。以国内某660 MW超超临界机组为研究对象,用等效焓降法对低温省煤器的节能效果进行了计算分析。结果表明:投运低温省煤器后,发电煤耗降低2.33 g/k Wh,节能效果显著;与国内同类型采用回转再生式原烟气/净烟气换热器的机组相比,引风机比压能下降约1 000 Nm/kg,工况点也得到了明显改善。
The heat loss of the exhaust gas is the greatest loss in all kinds of the boiler heat loss. The major influence factor on the heat loss of the exhaust gas is the exhaust gas temperature. Adding a low-temperature economizer into the rear duct of power station boiler and utilizing the waste heat of the exhaust gas to heat condensate water can decrease the inlet flue gas temperature of desulfurization system. Taking a domestic 660 MW ultra-supercritical unit as the study object,the paper uses the equivalent enthalpy drop method for the calculation and analysis on the energy-saving effect of low-temperature economizer. The calculation results show that the coal consumption rate for power generation can be decreased by 2. 33 g / k Wh after low-temperature economizers put into operation and the significant energy-saving effect can be achieved. Compared to the domestic same-type Gas-Gas-Heater units,the specific pressure of induced draft fan can drop about 1000 NM / kg and the operating point can be improved remarkably.
出处
《热能动力工程》
CAS
CSCD
北大核心
2016年第3期83-86,141,共4页
Journal of Engineering for Thermal Energy and Power
关键词
低温省煤器
余热利用
发电煤耗
引风机
low-temperature economizer
waste heat utilization
coal consumption rate for power generation
induced draft fan
