Evaluation of the Gas Turbine Inlet Temperature with Relation to the Excess Air

Abstract

This paper shows the effect of excess air on combustion gas temperature at turbine inlet, and how it determines power and thermal efficiency of a gas turbine at different pressure ratios and excess air. In such a way an analytic Equation that allows calculating the turbine inlet temperature as a function of excess air, pressure ratio and relative humidity is given. Humidity Impact on excess air calculation is also analyzed and presented. Likewise it is demonstrated that dry air calculations determine a higher level for calculations that can be performed on wet air

The effect of biomass moisture content on the IGCC efficiency

“…In practise, this is achieved by increasing excess air ratio [16]. Compression of the excess air is energy consuming, therefore the assumption that the low calorific syngas combustion could reduce this energy penalty, since its combustion proceeds at lower temperatures.…”

Thermodynamic analysis on the part-load performance of a microturbine system for micro/mini-CHP applications

“…Moreover, the excess air is also utilized to protect the turbine components from being overheated. Martínez et al reported that 600% to 100% excess air is required to maintain the turbine inlet temperature in the range of 800-1700°C while a methodology is presented to determine the turbine inlet temperature using the excess air and the pressure ratio [41]. In the present work, the excess air in the actual combustion process for different electrical loads is calculated from the actual fuel to air ratio.…”

Estudo De Configurações De Processo De Cogeração Aplicado Em Uma Estação De Tratamento De Efluentes

“…Sabendo que um fluido ao sofrer processo de expansão ou compressão que seja reversível e adiabático, então este processo é isentrópico (Smith et al, 2000). A eficiência de um compressor isentrópico é calculada pela equação 1 a seguir:…”

“…De acordo com o trabalho publicado por Martínez et al (2011), a maior temperatura de operação de turbinas comumente usadas na indústria é de 1700 °C, portanto, para manter a operação o modelo aqui apresentado em níveis aceitáveis, a temperatura do gás que entra na turbina será estipulada para 1500 °C.…”