COMPARATIVE INVESTIGATION OF VARIOUS HUMIDIFIED GAS TURBINE CYCLES

摘要

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.