中文摘要：

针对某600 MW亚临界空冷机组实际供电煤耗率偏高的现状,从机组锅炉、汽轮机两大部分进行了能效诊断,并诊断出机组供电煤耗实际值较供电煤耗设计值偏高的主要原因。借助EBSILION模拟软件,计算发现100%THA工况下低压缸相对内效率较设计值偏低,因此导致供电煤耗率有所增加。同时,又针对机组特点,提出了电动泵改汽动泵、提高主再热蒸汽温度的节能措施,并详细分析了两种节能措施对机组设计工况特性的影响。研究结果表明：在100%~40%THA不同工况下,同时进行电动泵改汽动泵以及提高主再热蒸汽温度后,机组发电功率增加,且供电煤耗率下降明显,两种改造措施所带来的节能效果非常显著。

英文摘要：

This paper carried on a diagnosis of energy cfficiencyin view of two main parts, boiler and turbine, and found out the reason why the actual value of the power supply coal consumption is higher than the design value in 600MW subcritical air cooling unit. Using EBSILION simulation software, we discovered that the low pressure cyl- inder relative internal efficiency is lower than the design value in 100%THA working condition, and this leads to the rise of the power supply coal consumption rate. According to characteristics of the unit, we put forward two kinds of energy saving measurements, changing electric pump to steam pump and improving the temperature of ma- inand reheat steam, and analyzed the influence of the two kinds of energy saving measures on the characteristics of the unit underdesign conditions. The results show that in the range of 100% -40% THA, by implementing the two measurements, the unit generated power rises, and the power supply coal consumption rate reduces obviously, so energy-saving effect is remarkable.