高湿度地区燃气-蒸汽联合循环机组进气冷却影响的研究

Reaserch of Inlet Air Precooling of Gas-Steam Combined Cycle in High-Humidity Area

燃气-蒸汽联合循环机组的出力和效率受进气温度影响较大。在夏季高温期间,采用进气冷却技术能够有效地增大燃气轮机和蒸汽轮机的做功能力,但对于我国南方沿海城市,高湿度的气候导致进气冷却需要带走大量空气中水分的潜热,这是一笔非常巨大的代价。传统分析通常只是比较加装进气冷却后的燃气-蒸汽联合循环机组系统的收益,并没有计算制冷所需要的代价。本文更全面地分析了在高湿度条件下加装溴化锂吸收式制冷机组对系统的影响,得出了进气冷却技术的确可以提高机组出力,但在高湿度环境下将会影响机组效率,从而降低电厂效益的结论。

The ambient temperature has a great influence on the performance and efficiency of gas-steam combined cycle. In this sense,the inlet air precooling technology is crucial to the increasing of the performance of gas turbine and steam turbine during the summer time. However,in the high-humidity south coastal area of our country,more cooling capacity is needed because of the enormous cost of latent heat. Traditionally,only the benefit of gas-steam combined cycle system with inlet air precooling has been taken into consideration,with its cost ignored. In this paper,the influence of inlet air precooling system is discussed completely. The result is that the inlet air precooling can increase the performance but may decrease the efficiency and profit of gas-steam combined cycle system at the same time.