火力发电厂中仍存在大量废热浪费的现象，回收该部分余热可有效提高电厂供热性能.提出一种由两级蒸发器串联耦合成的新型吸收式热泵系统以提升热泵机组性能与电厂能源利用率，新系统采用电厂锅炉排污水作为第二蒸发器的热源，同时回收循环冷却水与排污水余热，采用Aspen Plus软件进行模拟，以中国东北某200MW火电机组典型供热系统为例与新系统进行对比分析.研究结果表明，新系统较典型系统COP提高6.21%，年节约煤资源15358.91吨，投资回收期约3.82年，新型吸收式热泵系统具有良好的社会经济效益，新系统的提出为火力发电厂能量梯级利用提供了理论支撑，对节能减排与环境保护有着重要意义.

A large amount of waste heat still exists in the thermal power plant,and the recovery of the waste heat can effectively improve the heating performance of the power plant.In this paper,a new type of absorption heat pump system coupled with two cascade evaporators is proposed to improve the performance of the heat pump unit and the energy utilization ratio of the power plant.The new system uses the boiler blow-down water as the heat source of the second evaporator,and simultaneously reclaims the circulating cooling water and waste water exhaust heat.The Aspen Plus software is used for simulation.A typical heating system of a 200 MW thermal power unit in Northeast China is taken as an example to compare with the new system.The results show that the new system increases the COP by 6.21%,saves the coal resources by 15358.91 tons and the payback period of the new system is 3.82 years.The new system has good social and economic benefits.It provides a theoretical support for the energy cascade utilization of the thermal power plant,which is of great significance to energy conservation and environmental protection.