燃气-蒸汽联合循环系统的能量分析及火用分析

燃气-蒸汽联合循环系统是利用燃气侧高温吸热和蒸汽侧低温放热来扩大循环平均吸放热温差,促进能源的梯级利用,以提高循环效率。简述了余热锅炉型燃气-蒸汽联合循环的工作原理,采用能量平衡分析联合循环机组的热效率及其影响因素,采用火用分析方法和具体算例分析联合循环机组各部位火用损失及大小。通过分析计算,寻求燃气-蒸汽联合循环发电系统能量利用的薄弱环节,并为联合循环的节能指明方向。

Energy and Exergy Analysis of Gas-steam Combined Cycle

Gas-steam combined cycle uses endothering in high temperature on gas side and exothering in low temperature on steam side,to enlarge cycle's temperature head,promote energy's utilization by step,increase efficiency of the cycle.The paper formalates the operating principle of exhaust-heat boiler's gas-steam combined cycle;uses energy-blance method to analysis the combined cycle's thermal efficiency and its influencing factors,uses exergy method and specific calculation example to analysis the combined cycle'...