Measurement and analysis of an energy saving retrofitting project of flue gas heat recovery from gas-fired boiler

The high exhaust gas temperature of the thermal power equipment, such as gas-fired boilers, causes energy waste and environment pollution. Using a new self-developed efficient compact and anticorrosive condensing heat recovery device in an existing boiler room, makes energy saving retrofitting on the boiler room and followed field measurement. Analyses the changes of boiler gas consumption, exhaust gas temperature and heat efficiency. The results show that the exhaust gas temperature is reduced from 150-200 ℃ to below 50 ℃, and that the condensing exhaust gas heat recovery device could exclusively increase the heat recovery efficiency by more than 10%. Moreover, the device increases inlet water temperature of the boiler, the combustion efficiency is increased, so the overall low heat value efficiency is more than 100%, the high heat value efficiency is more than 95%, and the total energy saving rate could reach 25.6%.