Energy capacity of a technically optimized combined heat and power plant scheme taking into account exergy losses

The scientific article evaluates the efficiency of a combined cycle gas turbine unit using the extended exergy metering method. The extended exergy accounting method allows for a quantitative comparison of physical energy flows and non-energy quantities. Resource consumption is estimated, capital expenditures and environmental impact are calculated. The method describes various scenarios of general base consumption of primary resources. The facility under study is located in Basra, has an efficiency of 58 %, and provides high exergy annihilation of up to 1,000 MW. A combined cycle gas turbine plant is economically feasible. Part of the installation uses solar energy to increase efficiency. Fuel savings per year with proper optimization can reach up to 35 % per year. This is due to the high thermodynamic potential and low energy consumption of 750 MW. With the integration of a modern automatic control system, the installation of solar collectors and the use of air-water cooling, the plant’s productivity increases by up to 63 %. The net capacity is increased from 350 MW to 410 MW. There is a slight increase in capital costs, but at the same time energy losses are reduced by 73 % and service reliability is improved. The losses of the combined plant in thermodynamic processes are analyzed. The reasons for the decrease in power indicators and efficiency are revealed. Electric energy costs are decreasing, net present value and internal rate of return are increasing, and power indicators are increasing.

The purpose of the scientific research is to optimize the power parameters and reduce the energy losses of a combined gas turbine installation using the extended exergy method.

The scientific novelty of the article lies in the quantitative comparison of production processes and the expansion of traditional exergetic analysis.

The application of the extended exergy accounting method improves the thermodynamic performance and efficiency of fuel processes. The thermodynamic execution of processes is optimized through the compilation of the exergetic balance, efficiency, identification and control of the installation elements with the greatest exergetic losses.

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