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Abstract
A boiler or steam generator is a device used to create steam by applying heat energy to water. The flue gas temperature at the outlet of air preheater which-is the final regenerative equipment is higher than the design temperature and a proportionate quantity of heat is carried away by the flue gases to the atmosphere. A proportionate quantity of fuel can be saved by utilizing the waste beat from the flue gases. Due to this saving the efficiency of the boiler can also be increased considerably. A heat exchanger is used to recover the waste heat. Waste heat from the flue gas can be used to heat some portion of the feed water coming out from condensate extraction pump. Feed water is heated by passing it through the heat exchanger. Recovery of waste heat is done by placing heat exchanger in the flue gas, duct after air preheater stage. This is done without disturbing the original system.