Repowering of existing coal-fired power plants is often accomplished by adding gas turbines. In this paper we assume that the gas turbine exhaust is used for feed water preheating.Typical gas turbine exhaust temperatures are in the range 450-600C whereas typical boiler inlet temperatures are 250-300C. The big difference in temperature between exhaust and water prevents an efficient exchange of heat. One way to lower the exhaust temperature is to expand the gas to sub atmospheric pressure. The result is a 50% increase in possible installed gas turbine power.
|Title of host publication||Efficiency, Cost, Optimization, Simulation and Environmental aspects of Energy Systems and Processes|
|Place of Publication||Nancy, France|
|Publication status||Published - 1998|
|Event||ECOS '98 - Nancy, France|
Duration: 1 Jan 1998 → …
|Period||01/01/1998 → …|