摘要
介绍了采用开式循环水热媒给水预热技术解决省煤器低温露点腐蚀问题。开式循环水热媒给水预热系统由高、低温省煤器、给水预热器等组成,利用锅炉给水为热媒体,形成一个开式循环系统。315℃的高温烟气经过高、低温省煤器,与热媒水换热后,温度降低到170℃排向烟囱。锅炉给水在低温省煤器中吸收烟气热量,温度升高至190℃,部分进入给水预热器。102℃的锅炉给水通过给水预热器加热至140℃后再进入低温省煤器,保证进入低温省煤器的给水温度高于酸露点温度,避免了露点腐蚀的发生。运行表明,开式循环水热媒给水预热系统由于增设了给水预热器,提高了余热锅炉省煤器的实际进水温度,避免了省煤器露点腐蚀,确保制氢余热锅炉长周期安全稳定高效运行。
The application of open-loop circulating heating water preheating technology to control dew- point corrosion of economizer is introduced. The open-loop circulating heating water preheating system consists of HT and LT economizers, feed water preheater, etc. The boiler feed water （BFW） is used as heating media. In the open-loop circulating system, the high-temperature flue gas is emitted to stack after temperature reduction from 315 ℃ to 170 ℃ by heat exchange with heating water in HT and LT economizers. In the LT economizer, the temperature of boiler feed water is elevated to 190 ℃ by absorbing the heat from flue gas, and part of water flows to feed water preheater. The 102 ~C boiler feed water is heated up to 140 ~C before entering LT economizer so that the temperature of boiler feed water is higher than the acid dew point temperature to avoid the dew point corrosion. The operation shows that the installation of feed water preheater in the open- loop circulating heating water preheating system has raised the feed water temperature of economizer, which has effectively controlled the corrosion of economizer and ensured long-term reliable operation of waste heat boiler of hydrogen generation plant.
出处
《炼油技术与工程》
CAS
2013年第1期55-57,共3页
Petroleum Refinery Engineering
关键词
制氢余热锅炉
给水预热技术
低温露点
腐蚀
节能
投资
hydrogen generation plant, waste heat boiler, feed water preheating technology, LT dew point, corrosion, energy saving, investment
