With supercritical ( SC) and ultra supercritical ( USC) power unit main/ reheat steam parameters increase, the unit thermal efficiency being improved than the national average, which have a significant effect on energy conservation and environmental improvement. 超(超)临界机组由于主/再热蒸汽参数提高,机组热效率比国内现有平均水平明显提高,且具有显著的节能和改善环境的效果。