Energy, exergy, and environmental analyses of a poly-generation system based on biomass gasification

In this research, an integrated renewable-based energy system consisting of a biomass gasifier is investigated to generate electricity, heating, hot water, and freshwater. The emission of the system is evaluated based on a thermodynamic equilibrium approach. The concentration of CO, CO2, and NOx in combustion products are evaluated to assessment of environmental impacts. The results show that the value of normalized CO2, CO, and NOx emission are 729.9 kg/MWh, 0.0053 kg/MWh and 6.354 kg/MWh, respectively. Analyses indicate that despite that the concentration of CO2 in the product has the highest value, the emission cost of NOx with 170.6 $/h is higher than other species due to the harmful effects of this kind of emission. Results indicate that the higher value of design parameters i.e., gas turbine inlet temperature (GTIT), biomass moisture content (BMC), gasification temperature, and combustion temperature result in a decrease in the sustainability index.

Automated summary

This research investigates an integrated renewable-based energy system that utilizes a biomass gasifier for generating electricity, heating, hot water, and freshwater. The study evaluates the emission of the system and finds that the emission cost of NOx is higher than other species due to its harmful effects. The results also indicate that higher values of design parameters result in a decrease in the sustainability index.