吸收式热泵耦合大型抽凝机组供热的经济性分析

针对供热需求与供热能力之间的矛盾和电站低品位冷凝热利用不充分的问题,以300MW抽凝供热机组为实例制定了吸收式热泵耦合抽凝机组供热方案。结合耦合供热方案提出供热面积扩容率的概念,通过对耦合供热与传统热电联产供热两种供热方式的定流量热力计算,以供热面积扩容率、能源综合利用率和热电总收益三个经济性指标为比较标准,进行了经济性指标对比分析。结果表明:耦合供热方式在机组不增容的前提下能够扩大供热面积,提高能源利用率,并增加热电厂的经济收益。

Economic analysis of absorption heat pump coupling NC turbines in thermal power plant

As to the contradiction between the heating demand and heating capacity,and the problem of the utilization of low-grade condensing heat in power plants,this paper took a 300MW extraction-condensing unit(NC unit)as an example,designed the heating program of absorption heat pump coupled NC unit.First,combined with the heating program,proposed the conception of heating area expansion rate.Then,set the heating area expansion rate、the comprehensive energy utilization rate and the thermal and power total income as economic comparison standard,using constant-flow thermodynamic calculation method,compared the three economic indicators of coupling heating way and traditional thermal-power cogeneration heating way.Finally,the results show that the coupled heating mode could expand the heating area、 improve the energy efficiency,and increase the economic benefits of the thermal power plant,when the unit capacity did not change.