Demand of secondary energy is ever increasing. Presently, fossil fuels supply majority of it. Energy technologists are currently facing the formidable challenge of meeting this demand with minimum environmental impact, specifically reduced CO2 emission to minimize ‘climate change’. Also new technology development for efficient energy conversion is needed for renewable resource (e.g. biomass) utilization. Rice straw is an agricultural residue and has good calorific value to be used as an energy resource. For the efficient utilization of rice straw, combined cycle gas turbine (CCGT) based polygeneration is a possible option to deliver multiple utilities. In this paper, a polygeneration plant is proposed to deliver power, cooling, heating and desalinated water. It was simulated by Aspen Plus®. Results show that polygeneration has good potential in power generation as well as for various other utilities. Effects of gasification parameters and gas turbine compression ratio are also studied. Results show that optimum equivalence ratio is 3.5–4 for maximum fuel energy savings ratio and for maximum exergy efficiency. Higher GT-cycle compression ratio results more power output but other utility outputs decrease with increase in compression ratio.

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