基于CCHP系统燃机进气冷却改造的可行性分析

Feasibility Analysis on Gas Turbine Inlet Air Cooling Reconstruction about CCHP System

针对燃气——蒸汽联合循环机组输出功率随环境温度升高而下降的问题，提出了一种对分布式CCHP系统低负荷运行制冷站改造的方法，将制冷站剩余容量用于燃气轮机进气冷却系统，并利用热水型溴化锂吸收式制冷机回收余热锅炉排烟余热制冷，以降低燃机进气温度。技术经济分析结果表明，该进气冷却系统具有明显的经济效益；温度变化对燃气轮机性能影响的分析表明，加翅片管式表面换热器的燃机进气冷却系统可使燃机进气温度下降15～20℃，进气冷却至15℃可使燃气轮机机组年净增发电量约35705MW·h。

For the problem of Gas - Steam combined cycle unit output power decreasing at higher ambient temperatures, a reconstruction method of the distributed CCHP system lithium bromide refrigeration station running at low load is proposed, the remaining capacity of the cooling station is used for a gas turbine intake air cooling system. Hot water type lithium bromide absorption refrigerator use waste heat recovery of boiler flue gas to reduces the gas turbine intake air temperature. Technical and economical analysis results indicate that the intake air cooling system has significant economic benefits. Analysis of the performance of the gas turbine affected by ambient temperature changes showed that, intake air cooling system allows the gas turbine intake air temperature dropped by 15 - 20 ℃ using fin -tube heat exchanger, the gas turbine unit annual generating capacity increase about 35 705 MW· h when the intake air temperature is decreased by 15 ℃.