ПІДВИЩЕННЯ ЕФЕКТИВНОСТІ ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ ГТУ З УРАХУВАННЯМ КЛІМАТИЧНИХ ОСОБЛИВОСТЕЙ ЕКСПЛУАТАЦІЇ

Abstract

Cooling the air at the inlet of gas turbine units by utilizing the exhaust gas waste heat in the combined absorption-ejector chiller with absorption lithium-bromide chiller as a gas turbine unit and refrigerant ejector chiller as a low temperature cooling stage has been analyzed for changeable climatic conditions. The climatic peculiarities of ambient air cooling processes consisting in time removing of maximal values of ambient air temperature and air cooler heat load have been investigated. Taking this into account the current heat loads on the two-stage gas turbine unit intake air cooler were analyzed in comparison with designed installed cooling capacity of absorption-ejector chiller, i.e. in comparison with designed heat load on the two-stage gas turbine unit intake air cooler. The lack and surplus of designed installed cooling capacity of absorption-ejector chiller was calculated. The reserves of increasing the fuel efficiency of gas turbine units by intake air deep cooling taking into account the mentioned above climatic peculiarities of air cooling processes were revealed. A combined absorption-ejector chiller with absorption lithium-bromide chiller as gas turbine unit intake air high temperature cooling stage and refrigerant ejector chiller with condenser cooled by absorption chiller as turbine intake air low temperature cooling stage has been proposed for turbine intake air deep cooling at maximal values of ambient air temperature and during decreased air cooler heat loads. So as the coefficient of performance of refrigerant ejector chiller is much lower compared with its value for absorption lithium-bromide chiller the efforts were aimed to increase the first one. Such a gas turbine unit intake air cooling system with combined absorption-ejector chiller provides increasing of its coefficient of performance due to refrigerant ejector chiller condenser cooling by absorption chiller and increasing of ejector chiller coefficient of performance as a result. The realization of gas turbine unit intake air deep cooling provides the maximal annual fuel saving for site climatic performance conditions.