Thermodynamic performance assessment of an indirect intercooled reheat regenerative gas turbine cycle with inlet air cooling and evaporative aftercooling of the compressor discharge

Abstract

SUMMARYThis study provides a computational analysis to investigate the effects of cycle pressure ratio, turbine inlet temperature (TIT), and ambient relative humidity (j) on the thermodynamic performance of an indirect intercooled reheat regenerative gas turbine cycle with indirect evaporative cooling of the inlet air and evaporative aftercooling of the compressor discharge. Combined first and second-law analysis indicates that the exergy destruction in various components of gas turbine cycles is significantly affected by compressor pressure ratio and turbine inlet temperature, and is not at all affected by ambient relative humidity. It also indicates that the maximum exergy is destroyed in the combustion chamber; which represents over 60% of the total exergy destruction in the overall system. The net work output, first-law efficiency, and the second-law efficiency of the cycle significantly varies with the change in the pressure ratio, turbine inlet temperature and ambient relative humidity. Results clearly shows that performance evaluation based on first-law analysis alone is not adequate, and hence more meaningful evaluation must include second-law analysis. Decision makers should find the methodology contained in this paper useful in the comparison and selection of gas turbine systems.

Statistical analysis and optimum performance of the gas turbine power plant

“…The favourable conditions for increasing the working capacity of a CCGT power generation plant are: the intake temperature of is decreased to 15ºC (ISO) and the humidity (RH) are maintained to about 100% before the entrance in GT power plant compressor. These conditions of GT power plant are commonly measured to check the efficiency and power generation capacity of the plant [15][16][17][18]. The operating limits mentioned above like pressure ratio, ambient temperature, air-fuel ratio, turbine inlet temperature, compressor as well as turbine isentropic efficiency is continuously applied to the performance of GT plant [19,20].…”

Analysis of parameters affecting the performance of gas turbines and combined cycle plants with vapor absorption inlet air cooling

“…The enthalpy at any polytropic stage of compressor has been calculated using equations (1), (2), and (7).…”

“…The combined cycle plant typically produces 30% higher outputs at ambient temperature of −6.6 °C than at 35 °C . Thus, the cost of installing a combined cycle plant rated at 35 °C is 20%–30% higher than that rated at −6.6 °C.…”

“…The combined cycle plant typically produces 30% higher outputs at ambient temperature of À6.6 C than at 35 C [2]. Thus, the cost of installing a combined cycle plant rated at 35 C is 20%-30% higher than that rated at À6.6 C. This inherent disadvantage of reduced combined cycle plant output at high ambient temperatures can be mitigated by the reduction of the compressor inlet air temperature, which would result in the increase of combined cycle plant output at a given ambient temperature.…”

A Calculation and Analysis to Determine Feasibility of Inlet Air Evaporative Cooling Systems for CCPP by Thermodynamic and Economic Method

“…Different inlet air cooling technologies of gas turbine and CCPP are introduced [1,2], and their benefits and drawbacks associated with the electric power load requirements and the climatic conditions are investigated [3][4][5][6]. Hosseini et al [7] modeled the performance enhancement of CCPP by media evaporative cooling system and investigated the effects of ambient temperature, RH and pressure.…”