回收乏汽余热的吸收式热泵性能及对机组调峰性能的影响

采用吸收式热泵回收汽轮机乏汽余热用于供热，具有显著的节能效果。以某300 MW直接空冷供热机组为例，建立了基于热泵回收乏汽余热的供热机组性能计算模型，分析了供热量对热泵辅助供热系统性能的影响，研究了热泵辅助供热方式下机组的调峰性能。结果表明，回收乏汽余热的吸收式热泵性能系数为1.73，热泵辅助供热方式的火用效率较传统供热方式提高了15.6%。采用热泵辅助供热可节省供热抽汽64.7 t/h，机组净增功率11.1 MW。随着供热量的增加，热泵辅助供热系统中乏汽利用量及节省的汽轮机抽汽量增多，而机组净增功率先增加后减少。采用热泵辅助供热后，机组的可调峰范围扩大。

Performance Analysis of Absorption Heat Pump with Exhaust Steam Heat Recovery and Its Influence on Peak Regulation Capability

Heat recovery from exhaust steam based on absorption heat pump can be used for heating, which has remarkable energy saving effect. Taking a 300 MW direct air-cooled heating unit as an example, this paper constructs the calculation model for heating unit performance based on heat pump with exhaust steam heat recovery, analyzes the influence of heating load on the heating supply system with heat pump, and studies the peak regulation capability of the unit with heat pump heating supply system. The results show that the performance coefficient of absorption heat pump with heat recovery from exhaust steam is 1.73, and the exergy efficient of heat pump heating supply system increases by 15.6 % compared with that of the traditional system. The heat pump heating supply system can save extraction steam of 64.7 t/h, and the net power increment is 11.1 MW. With the increase of heating load, the recovery exhaust steam increases in heat pump heating supply system, which saves more extraction steam of turbines； while the net power increment increases and subsequently decreases. The peak regulation capability is improved by heat pump recovering heat from exhaust steam.