Abstract
Integrated biomass gasification combined cycles can be advantageous for providing multiple products simultaneously. A new electricity and freshwater generation system is proposed based on the integrated gasification and gas turbine cycle as the main system, and a steam Rankine cycle and multi-effect desalination system as the waste heat recovery units. To evaluate the performance of the system, energy, exergy, and economic analyses were performed. Also, a parametric analysis was performed to assess the effects of various parameters on the system’s performance criteria. The economic feasibility of the plant was analyzed in terms of net present value. For the base case, the performance metrics are evaluated as W.net=8.347 MW, ε=46.22%, SUCP=14.07 $/GJ, and m.fw=11.7 kg/s. Among all components of the system, the combustion chamber is the greatest contributor to the exergy destruction rate, at 3250 kW. It is shown with the parametric analysis that raising the combustion temperature leads to higher electricity and freshwater production capacity. For a fuel cost of 2 $/GJ and an electricity price of 0.07 $/kWh, the total net present value at the end of plant’s lifespan is 6.547×106 $, and the payback period is 6.75 years. Thus, the plant is feasible from an economic perspective.
Highlights
Renewable energy resources such as biofuels are receiving significant attention worldwide
Since cogeneration systems yield to higher power generation capacity and offer desirable efficiencies and are due to abundant sources of biomass sources, integrated biomass gasification combined cycles can be considered as potentially beneficial technologies that provide multiple products simultaneously
The main novelties of the devised system lie in the integration of biomass gasification and a regenerative gas turbine with intercooling and a syngas combustor, where the syngas produced in the gasifier is burnt in the combustion chamber and directly fed to a gas turbine
Summary
Renewable energy resources such as biofuels are receiving significant attention worldwide. Soltani et al [8] analyzed an integrated biomass gasification and gas turbine combined cycle from energy and exergy perspectives. Since cogeneration systems yield to higher power generation capacity and offer desirable efficiencies and are due to abundant sources of biomass sources, integrated biomass gasification combined cycles can be considered as potentially beneficial technologies that provide multiple products simultaneously. The energy discharged from the gas turbine is utilized through a HRSG for further power generation Another motivation of the proposed system is the combination of a SRC and a MED desalination unit, in which the latter device acts as the condenser in the SRC plant. A parametric analysis was carried out to determine the impact of the main design parameters on the performance metrics of the system
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