Thermoeconomic analysis and performance evaluation of gas-steam combined cycle power plant based on H&S model

Traditional E&S model could not define the fuel and product of dissipative components conceivably in thermodynamics viewpoint. The productive components were overcharged. A new model was established for gas-steam combined cycle power plant based on structure theory of thermoeconomics and H&S theory in order to conduct the cost calculation and performance analysis of energy systems more reasonably and effectively. The composition of each component's thermoeconomic cost was analyzed and the concept of dissipative cost was proposed. The traditional evaluation indexes of relative cost difference and exergyeconomic coefficient were improved based on the H&S model. The typical 9FA single shaft gas-steam combined cycle generating unit was used to verify the effectiveness and accuracy of the model. Results show that the structure theory of thermoeconomics based on H&S model can reasonably deal with dissipative components' definition of fuel and product. The productive components can be fairly evaluated. For the condensate pump and the combustion chamber, it is necessary to reduce negentropy cost caused by irreversibility. For the air compressor and the steam turbine, the direction of improvement is to reduce non-energy cost. © 2016, Zhejiang University. All right reserved.