天然气锅炉烟气余热利用节能改造工程实测分析
Measurement and analysis of an energy saving retrofitting project of flue gas heat recovery from gas-fired boiler
摘要：
针对天然气锅炉等热能动力设备排烟温度高，造成能源浪费和环境污染的现状，应用自主研发的高效紧凑防腐型烟气冷凝热能回收利用装置，对一既有锅炉房进行了烟气余热回收利用节能改造和跟踪实测。分析了锅炉耗气量、排烟温度及热效率的变化，结果表明，排烟温度由150~200 ℃降到50 ℃以下，仅烟气余热回收装置就使锅炉热效率提高10%以上，且由于该装置提高了锅炉进水温度，从而提高了锅炉本体燃烧效率，使锅炉低热值总效率超过100%，锅炉高热值效率超过95%，锅炉房总节能率达25.6%。
Abstract：
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%.
Keywords:gas-fired boiler, smoke condensation, waste heat recovery, exhaust gas temperature, heat efficiency, energy saving