一种吸收式热泵—空冷复合系统的热力学分析

Thermodynamic Analysis of a New Air-cooling System Combined With an Absorption Heat Pump

对一种应用于火力发电厂的吸收式热泵-空冷复合系统,采用热量法和火用方法进行热力学分析。结果表明:利用吸收式热泵吸收空冷发电机组7.3%的乏汽量,并用热泵加热发电机组的乏汽凝结水时,机组背压可降至5 kPa,机组发电量可提高3.9%。该系统可降低空冷发电机组夏季运行的背压,提高机组的安全稳定性和运行效率。

The thermodynamic performance of an air-cooling system combined with an absorption heat pump in thermal power plants is analyzed by heat and exergy method. The result indicates that when 7.3% of exhaust steam from the air-cooling generator set is absorbed by the absorption heat pump, and the exhaust steam condensate of the generator set is heated by the heat pump, the back pressure of the generator set can be reduced to 5 kPa, and its generating capacity will be increased by 3.9%. The system can reduce the operation back pressure of the air-cooling generator set in summer and improve the safety, stability and operation efficiency.