Various advanced gas turbine cycles have been proposed to compete with combined cycles. One of the promising cycles is humid air turbine cycle. The latest configuration proposed for this cycle is known as part flow evaporative gas turbine cycle (PEvGT) in which humidification is combined with steam injection. Having advantages of both steam injected and humid air cycles, it is regarded as a very desirable plant for future. The objectives of this paper are: Development of a comprehensive model for analysis of PEvGT cycle in order to predict its performance parameters depending on different design conditions. It should be noted that the model validated with available data in literature. Comparing the performance of PEvGT cycle with full flow evaporative gas turbine cycle (FEvGT) and stand alone steam injected gas turbine cycle (STIG). Based on a computer code developed for this research, a parametric analysis was carried out for the above-mentioned cycles for a wide range of pressure ratio and turbine inlet temperature variations. The obtained results show that the specific net work of PEvGT cycle, for given conditions, is higher than for both FEvGT and STIG cycles. On the other hand, the efficiency of PEvGT is higher than STIG but is slightly lower than FEvGT cycle.
Computer modelling of Performance optimization was done to examine the effect of key operating variables like compressor pressure ratio, turbine inlet temperature, and recovery boiler pressure on performance parameters of a simple combined cycle and comparison was made to a simple gas turbine cycle. Both thermal efficiency and specific net work were examined as pressure ratio and recovery boiler pressure were varied for each turbine inlet temperature. Also careful consideration was given to admissible values of stack gas temperature, steam turbine outlet dryness fraction, and steam turbine outlet dryness fraction, and steam turbine inlet temperature. Specifically, it was shown that when we treat a combined cycle as an integrated system, efficiency optimization entails a pressure ratio below that suitable for simple gas turbine plant.
The evaporative gas turbine cycle is a new high-efficiency power cycle that has reached the pilot plant testing stage. This article presents the construction of a mathematical model for thermodynamic simulation of part-flow evaporative gas turbine cycle including steam injection. The maximum deviation of predicted performance results by this model from available data in literature was 1 per cent. Then, changes in configuration of this cycle have been investigated. Configuration changes concern using feed water heater and injection of saturated vapour instead of superheated vapour to the humid air in the cycle. This investigation shows that both these strategies were in the direction of improvement of efficiency and specific work of cycles (intercooled and non-intercooled). The results obtained from this research show that using spray cooler as the intercooler in the intercooled cycle offers interesting perspectives. In addition, the optimization of part-flow evaporative gas turbine (PEvGT) cycles in the systematic manner is presented and discussed.
Combined cycle cogeneration plants offer significant advantages over other cogeneration systems in many medium and large scale industrial applications. This paper presents a new methodology for the identification of the most efficient plant to satisfy given process requirements of heat and power loads and process steam conditions.
Most of investment in power generation industry tends to combined gas and steam turbine power plants due to thermodynamic and economic reason. Beside this tendency repowering of existing power plants is an attractive option for upgrading and life extension of existing power plants. In fact repowering is usage of combined cycle advantages for increasing power output and efficiency in steam power plants. Several approaches are proposed for repowering regards to condition of existing power plants such as life period and condition of parts of that and most important off all boiler condition. One of this approaches which provide opportunity of existing boiler reusing is converting existing power plant to fully fired combined cycle by installing a gas turbine and integration of that with existing steam units boiler. The aim of this paper is investigation of condition and how to integration of gas turbine and boiler. Also by exerting the condition and limitation in integration, the effect of gas turbine parameters to power output and efficiency of after repowering have been investigated. Finally the best condition of gas turbine parameters with high power and efficiency will be introduced.
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