摘要
针对某300 MW电厂循环流化床(CFB)锅炉高负荷下排烟温度过高,低负荷再热蒸汽温度不足的问题,提出了增加低温再热器面积的改造方案,并基于运行数据,对该锅炉改造前后的3个典型运行工况进行了详细热力计算与分析。结果表明:增加低温再热器面积可以有效地提高再热汽温,但受限于省煤器的烟-水换热特性,单纯降低省煤器之前的烟温难以降低最终的排烟温度。
For a 300 MW power plant circulating fluidized bed （CFB） boiler, the exhaust gas temperature is too high under high load, while the reheat steam temperature is largely reduced under the low load condition, a retrofit- ting program is proposed to solve this problem by increasing the heat transfer area of the low-temperature reheater. Based on the operational data, comprehensive thermodynamic calculations and analysis are conducted for three typi- cal operating conditions before and after the retrofitting. Results show that increasing the heat transfer areas of the low temperature reheater is an effective method to enhance the reheat steam temperature. But limited by gas-water heat transfer characteristics in economizer, it is difficult to reduce the final exhaust gas temperature by simply re- ducing the gas temperature before economizer.
出处
《电力科学与工程》
2014年第4期52-56,60,共6页
Electric Power Science and Engineering
基金
国家自然科学基金资助项目(51276059)
关键词
循环流化床锅炉
低温再热器改造
热力计算
换热特性分析
CFB boiler
low-temperature reheater transform
thermodynamic calculation
analysis of heat trans- fer characteristics
