Радіоелектронні і комп'ютерні системи (Oct 2018)
COMPUTER SIMULATION OF AIR COOLING PROCESSES AT THE INLET OF THE GAS TURBINE UNIT WITH THE DETERMINATION OF THE RATIONAL AIR VELOCITY IN AIR COOLER
Abstract
It is proposed to determine the rational velocity of air flow through the air coolers of a stepped a waste heat-recovery absorption-ejector chiller utilizing the heat of exhaust gases of a gas turbine unit to cool the air at the inlet, by computer simulation of air processes processing. Whereas the result of air cooling depends on the efficiency of the air coolers at the inlet of the gas turbine unit, it is proposed to determine it as an increase in the specific fuel economy, which consider both the cooling depth (the magnitude of the temperature decrease) of the air and the air resistance of the air cooler, which significantly affects the efficiency of operation cooling devices. On the example of air cooling at the inlet of a gas turbine unit has been analyzed the value of specific fuel economy by cooling the air at the inlet to a temperature of 10 °C in a two-stage absorption-ejector chiller, depending on the rational airflow rate through the cooling units (air coolers). The efficiency of the air coolers at different air flow rates has been analyzed. It is shown that proceeding from the different rate of increment in the specific fuel economy caused by the change in the rational velocity of air flow through the air coolers of chillers, it is necessary to choose a design (rational) the rational velocity of air flow that ensures the achievement of a maximum or close to the maximum increase in the specific fuel economy at relatively high rates increments. In order to determine the established the rational velocity of air flow through the air coolers, which provides the maximum increment of the specific fuel economy, the dependence of the increment of the specific fuel economy on the airflow velocity is analyzed. Based on the results of modeling air cooling processes at the inlet of the gas turbine unit, using software from firms that produce heat exchange equipment, it is proposed to determine the rational velocity of air through the air coolers, which ensures a close maximum specific fuel economy at relatively high rates of its increment
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