Радіоелектронні і комп'ютерні системи (Mar 2019)
SIMULATION OF CONDENSATE PRODUCING PROCESSES DURING GAS TURBINE UNIT INTAKE AIR COOLING
Abstract
The processes of gas turbine unit intake air cooling with producing the condensate as a subproduct were simulated with using the computer programs of the firms-producers of the heat equipment for gas turbine unit intake air cooling waste heat recovery system with exhaust gas heat conversion. The heat-humidity processes in the two-stage air cooler of combined type with water stage of precooling air to the temperature not lower than 15 °C and refrigerant stage of further deep cooling air to the temperature about 10 °C by utilizing the exhaust gas waste heat in the absorption lithium-bromide chiller as the high temperature cooling stage and refrigerant ejector chiller as the low temperature cooling stage of the combined thermotransformer has been analyzed for daily changing ambient air temperatures and heat loads on the stages as consequence. The algorithm for treatment of data received by using the computer simulation programs of the firms-producers of the heat equipment for gas turbine unit intake air cooling waste heat recovery system with exhaust gas heat conversion is presented. The processes of producing the condensate as a subproduct of gas turbine unit intake air two-stage cooling were simulated for two variants of design heat loads upon air cooler stages: for approximately equal heat loads upon the air cooler stages and for more than twice decreased heat load upon the high temperature cooling stage as compared with a heat load upon the low temperature cooling stage. The data about hourly amount of condensate extracted in each air cooler stage was summed up over a day and its temperature was calculated. The results of calculation have shown that the temperature of condensate received in the refrigerant low temperature cooling stage are lower by 3…4 °C as compared with its value for high temperature cooling stage with a chilled water temperature of 7 °C from absorption lithium-bromide chiller. It was also shown that the temperature of condensate from both stages of a combined two-stage air cooler remained nearly unchangeable during days. A conclusion about using the condensate from low temperature cooling stage as a coolant has been made.
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