engleski

Increasing Cogeneration Efficiency with Heat Accumulation

In this paper we analysed the operation of two gas turbine power blocks, which consist of one gas turbine of 26 MW with appropriate HRSG without additional firing. The gas turbine power blocks, which are located in power plant EL-TO Zagreb, Croatia, are used for supplying the district heating system Zagreb-West with heat. In this paper the heat accumulation in the low heat demand in a summer season was considered. During the summer period, only the industrial steam and warm water for sanitary use is generated. Analyzing the heat demand both of warm water and industrial steam load, it was found that the heat demand varies significantly. The unit power output is controlled by heat load. The electrical power is function of the heat. By decreasing the heat power output, the electric power output decreases faster. At low heat power generation, the electric power generation falls in the non-economic region. With introducing heat accumulation, in low heat demand periods, the turbine operation is set in economic region for most of the time. The increase of entire plant efficiency was achieved, including increased electricity generation, lower heat consumption and decreased number of over night shut down requirements.

kogeneracija; plinska turbina; generator pare na ispušne plinove

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