Exergoenvironomic modelling and performance assessment of selected gas turbine power plants

摘要

Purpose - This study aims to use an environomics method to assess the environmental impacts of selected gas turbine power plants in Nigeria. Design/methodology/approach - In this study, exergoenvironomic analysis has been carried out to investigate the environmental impact of selected gas turbine power plants in Nigeria from an exergetic point of view. Findings - The exergy analysis reveals that the combustion chamber is the most exergy destructive component compared to other cycle components. The exergy destruction of this component can be reduced by increasing gas turbine inlet temperature (GTIT). The results of the study show that thermodynamic inefficiency is responsible for the environmental impact associated with gas turbine components. The study further shows that CO_2 emissions and cost of environmental impact decrease with increasing GTIT. Originality/value - The exergo-environomic parameters computed in this study are CO_2 emission in kg per MWh of electricity generated, depletion number, sustainability index, cost flow rate of environmental impacts (C_(env)) in $/h and total cost rates of products (C_(Tot)) in $/hr. For the period considered, the CO_2 emissions for the selected plants vary from 100.18 to 408.78 kgCO_2/MWhm, while cost flow rate of environmental impacts varies from $40.18 /h to $276.97 /h and the total cost rates of products vary from $2935.69/h to $12,232.84/h. The depletion number and sustainability index vary from 0.69 to 0.84 and 1.20 to 1.44, respectively.