Thermodynamic investigation on coal fired emission free s-CO2 power cycles

India has a large amount of coal deposits, currently account for 60% of the nation's electricity production. However, burning coal for the purpose of producing energy is not environmentally friendly practice as it releases large quantities of CO2 and greenhouse gases into the atmosphere and causing global warming issues. Emissions from power generation plants can be effectively reduced by using an oxy-fuel combustion power generation system with carbon capture and storage. This work presents an effective solution to reduce carbon emissions from coal-powered power plants. The proposed power generation system consists of a coal gasifier integrated with an oxyfuel combustion power cycle and a carbon capture and storage unit. This work discusses three different configurations of coal-based oxy-combustion power generation systems. Each proposed cycles modelled thermodynamically, and investigations were conducted using the Engineering Equation Solver (EES). The sensitivity analysis and parametric study were performed for the chosen input variables, such as cycle pressure ratio, turbine inlet temperature, coal composition, and split ratio, and observed the effect on net power and thermal efficiency. The results indicate that the coal-based oxyfuel combustion cycles possess high first-law efficiency with a 100% carbon-capturing rate. The thermal efficiency was observed 23.4% for the basic version of the oxyfuel power cycle. By incorporating a recuperator into the basic cycle, the thermal efficiency reached 39.42%. Further, the recuperator integrated cycle is again modified with stream split and double expansion, and the thermal efficiency of the power cycle reached 41.33%.

Thermodynamic investigation on coal fired emission free s-CO2 power cycles Keywords:

Oxy Fuel Combustion , Coal Based Power Generation , Emission Free Power Generation , Carbon Capture and Storage , s-CO2 Power Cycle