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Abstract
India’s energy market is one of the country a fastest developing sectors. The electricity generated from thermal power plants contributes 68.14% of the total generation. The availability of coal in the country such that the high grade of coal, which have higher calorific value, have been exhausted and progressively over grades of coal are being made available for generation of electricity in power plants.This has resulted in poor thermal efficiencies of power plants.The major loss of a boiler is caused by the hot stack gases discharging to the atmosphere in order to increase the efficiency of boiler. But we have to extract maximum amount of heat from the flue gases and increase the heat pick up the rate of the rate of the feed water outlet in boiler.