The efficiencyof a coal-fired thermal plant is typically in the range of 30%-35%. In a combined cycle gas turbine system running on natural gas, the maximum efficiency is in the range 45%-50%.
The ideal cycle heat efficiency used nowadays is affected by the relative internal efficiency so it can't reflect the operation economic state ofthermal system of steam turbine.
目前采用的汽轮机理想循环热效率受到相对内效率影响而不能准确反映汽轮机热力系统运行经济状态。
3
The optimization of the ecological function makes the entropy generation rate ofcycle decrease greatly and the thermalefficiency increase with the cost of a little decreasing of the power output.