Abstract
Currently, gas turbine is one of the most widely-used power generating technologies. The race to achieve higher efficiency from gas turbines is gathering momentum with most of the major manufacturers. Cogeneration with advanced engines has the prospect of attaining thermal efficiencies around 60% in the future. In this condition, further development of gas turbine design optimization in order to obtain higher thermal efficiency seems to be beneficial. In the current work, the design of a single shaft gas turbine in a cogeneration plant is optimized based on the model established using thermodynamic theory. The overall thermal efficiency of the engine is tried to be optimized by adjusting the compressor efficiency, turbine efficiency, compression pressure ratio, and turbine inlet temperatures. A feasible solution should satisfy two physical constraints, namely a desired gas turbine power and a suitable limit of engine exhaust temperature. An evolutionary model using Simulated Annealing algorithm is developed to find the sets of optimal solutions in the space defined by user experience and literature. A number of case studies have been performed and an optimal solution and their corresponding performance are discussed.
Highlights
Industrial gas turbine (IGT) is related to the majority of energy consumption in the world
Case study 1) At the first case study, compressor and turbine efficiencies are assumed to be constant. These variables are set to their maximum values which are 86% and 91%, respectively
The optimization algorithm was performed to find the sets of other design variables, i.e. compressor pressure ratio and turbine inlet temperature in a way that maximize the overall engine thermal efficiency
Summary
Industrial gas turbine (IGT) is related to the majority of energy consumption in the world. Open-cycle gas turbine engines exhaust a high-grade heat to the atmosphere. The cogeneration (cogen) through combined heat and power (CHP) is the simultaneous production of electricity with the recovery and utilization of the exhaust heat from the gas turbine engine. Single shaft gas turbine units feature direct mechanical coupling between power turbine stages and compressor drive turbine stages so that all rotating elements operate at the same speed. Most large industrial turbines are of single shaft design
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