电站余热利用方案热经济性分析对比  

Thermal Economic Analysis and Comparison of Waste Heat Utilization Schemes in Power Plants

作　　者：张鹏[1] 王利伟[1] ZHANG Peng;WANG Li-wei

机构地区：[1]华北电力科学研究院(西安)有限公司

出　　处：《电站系统工程》2018年第5期65-68,72,共5页Power System Engineering

摘　　要：为深度挖掘电站余热利用潜力,探索电站余热最佳利用方案,在传统余热利用的基础上,提出吸收式热泵+烟气梯度利用方案,并以某600 MW超超临界机组为研究对象,选取了采用低压省煤器、吸收式热泵加热凝结水和吸收式热泵+烟气梯度利用的三种余热回收方案,详细阐述各自的技术特点,并对三种余热利用方案进行了热经济性分析对比。结果表明,案例电厂在采用低压省煤器、吸收式热泵加热凝结水、吸收式热泵+烟气梯度利用方案时,机组供电煤耗分别降低2.5 g/(kW·h)、2.79 g/(kW·h)、9.04 g/(kW·h)。由此可见,吸收式热泵+烟气梯度利用方案节能效果显著。In order to excavate the potential of waste heat utilization in power plants and explore the best scheme, the absorption heat pump ＋ flue gas gradient system was proposed based on the conventional schemes. Taking a ultra supercritical 600 MW unit as the example, three kinds of waste heat utilization schemes were chosen to be studied, which were low pressure economizer, absorption heat pump heating condensate and absorption heat pump ＋ flue gas gradient utilization. The technical characteristics of three kinds of schemes were expounded in detail, and the thermal economic analysis and comparison were conducted. The results indicate that the coal consumption can be reduced respectively by 2.5 g/（kW·h）, 2.79 g/（kW·h）, 9.04 g/（kW·h） when low pressure economizer, the absorption heat pump, or absorption heat pump ＋ flue gas gradient utilization is used. It can be seen that the energy-saving effect of absorption heat pump ＋ flue gas gradient utilization is remarkable.

关 键 词：余热利用 吸收式热泵 烟气梯度利用 节能改造 热经济性 等效焓降 

分 类 号：TK16[动力工程及工程热物理—热能工程]