When the pressure in a boiler exceeds the "critical" pressure of 3,208 psi, water and steam have the same density and no longer exist as separate phase states. Steam conditions above the critical pressure are referred to as "supercritical." Modern supercritical units operate at steam conditions above 3,900 psi/1,075 F/1,110 F, while typicalrnsteam parameters in subcritical reheat steam plants are 2,400 psi/1,000 F/1,000 F.rnSupercritical steam conditions result in a net plant efficiency of up to 45 percent, an improvement of 3.5 percentage points over a subcritical unit. Less coal is used to generate the same amount of electricity.
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机译：当锅炉中的压力超过3,208 psi的“临界”压力时，水和蒸汽具有相同的密度，不再以单独的相态存在。高于临界压力的蒸汽条件称为“超临界”。现代超临界装置在高于3,900 psi / 1,075 F / 1,110 F的蒸汽条件下运行，而亚临界再热蒸汽厂的典型蒸汽参数为2,400 psi / 1,000 F / 1,000 F.rn超临界蒸汽条件导致工厂净效率高达45％，比亚临界单位提高了3.5个百分点。较少的煤炭用于产生相同的电量。
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