GAS TURBINES IN SIMPLE CYCLE COMBINED CYCLE APPLICATIONS

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GAS TURBINES IN SIMPLE CYCLE COMBINED CYCLE APPLICATIONS ( gas-turbines-in-simple-cycle-combined-cycle-applications )

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The application example below, which illustrates application of an SGT-700, is also another “repowering” (see the section on Combined Cycles) case illustration. The very first SGT-800 gas turbine was delivered to Helsingborg Energi AB (now called Öresunds Kraft). This municipal utility in the southern Swedish town of Helsingborg is using this gas turbine to extend its Vasthamn coal-fired power station. The SGT-800 gas turbine has been integrated with an existing steam turbine system to create a combined cycle, CHP plant. The project is supported by the State Energy Authority and DESS (the Delegation for Energy Supplies for Southern Sweden). The turbine was ordered in August 1998 and connected to the grid at 100% load in November 1999. It burns natural gas from the pipeline which passes through Helsingborg. Fitted with AEV burners, it provides emissions of NOx and CO below 15 ppmv (at 15% O2).The electrical generating capacity at Vasthamn went from 64 MW to 126 MW, and the heat production capacity from 132 MW to 186 MW. Fig. 67. Municipal utility in the southern Swedish town of Helsingborg (Source: Siemens Westinghouse) Combined Cycles Combined Cycle Basic Components, Terminology and Heat Cycle(s) The term combined cycle (CC) refers to a system that incorporates a gas turbine (GT), a steam turbine (ST), a heat recovery steam generator (HRSG), where the heat of the exhaust gases is used to produce steam and a generator. The shaft power from the gas turbine and that developed by the steam turbine both run the generator that produces electric power. The term “cogeneration” means generation of both work (shaft power) and heat (steam, in the case of a CC). So a combined cycle is a form of cogeneration. Fig. 68. Single and Multi shaft arrangements for CC plants (Reference: The World Bank) 56 The following figure shows a single shaft CC cycle block diagram in more detail.

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