초록 ▼

The efficiency of a combined cycle power plant is improved by preheating fuel supplied to a combustion turbine. The flow rate of feed water through an economizer section of a heat recovery steam generator is increased, and the excess flow, over that required to sustain saturated steam production in

The efficiency of a combined cycle power plant is improved by preheating fuel supplied to a combustion turbine. The flow rate of feed water through an economizer section of a heat recovery steam generator is increased, and the excess flow, over that required to sustain saturated steam production in an evaporator section, is flowed through a heat exchanger to preheat the fuel.

대표청구항 ▼

Method of operating a combined cycle power plant comprising the steps of: (a) flowing exhaust gas from a combustion turbine through a heat recovery steam generator (HRSG); (b) flowing feed water through an economizer section of the HRSG at a flow rate and providing heated feed water; (c) flowing a f

Method of operating a combined cycle power plant comprising the steps of: (a) flowing exhaust gas from a combustion turbine through a heat recovery steam generator (HRSG); (b) flowing feed water through an economizer section of the HRSG at a flow rate and providing heated feed water; (c) flowing a first portion of the heated feed water through an evaporator section of the HRSG and producing saturated steam at a production rate, the flow rate of the feed water through the economizer section being greater than required to sustain the production rate of steam in the evaporator section; (d) flowing fuel for the turbine through a heat exchanger; and, (e) flowing a second portion of the heated feed water provided by the economizer section through the heat exchanger then to an inlet of the economizer section, thereby heating the fuel flowing through the heat exchanger.