SONG Jinghui, LIU Guicai, LIAO Yanfen, et al. Energy-saving analysis for heat recovery from low-temperature flue gas in coal-fired units[J]. Thermal power generation, 2015, 44(9): 57-60.
SONG Jinghui, LIU Guicai, LIAO Yanfen, et al. Energy-saving analysis for heat recovery from low-temperature flue gas in coal-fired units[J]. Thermal power generation, 2015, 44(9): 57-60.DOI:
燃煤机组锅炉低温烟气余热利用节能效益分析
摘要
在锅炉烟道尾部安装低压省煤器
可降低排烟温度
提高锅炉效率;将烟气余热用于汽轮机抽汽回热系统
可使部分回热器抽汽返回汽轮机做功
提高机组的能源利用率。为此
以某100 MW燃煤机组为例
通过迭代-校核法和等效焓降法
验证了采用低压省煤器进行余热利用的节能效果。结果表明
余热利用改造方案可使该机组锅炉排烟温度降低23.7℃
锅炉效率提高1.214%
热耗率降低60kJ/(kW·h)
发电标煤耗量减少2.313g/(kW·h)。
Abstract
Installing low pressure economizer in tail flue duct of boilers can reduce exhaust temperature and enhance the boiler efficiency.The waste heat of flue gas is introduced into regenerative system of the steam turbine
so part of the exaction steam will return into the turbine to do work
thus to improve energy utilization efficiency of the unit.Taking a 100 MW unit coal-fire power unit as the example
the energy-saving effect of the above waste heat utilization technology was verified by applying the iteration-check method and the equivalent enthalpy drop method.The results show that
this waste heat recovery transformation scheme can reduce the exhaust temperature by 23.7 ℃
increase the boiler efficiency by 1.214%
decrease the heat rate by 60kJ/(kW·h)and save the coal consumption by 2.313g/(kW·h).