Negative CO2 emissions in biomass gasification process with hybrid amine-deep eutectic solvents

Abstract

Abstract Biomass gasification is one of the most promising solution for producing clean electricity. This technology option can reduce the use of fossil fuels and limit the exhaust CO 2 emissions in atmosphere. Moreover, by integrating different CO 2 separation technologies, the biomass gasification power plant is considered to have negative CO 2 emissions due to the CO 2 absorption during its growth. In this study, the physical absorption process deep eutectic solvent (DES) was used to retain the CO 2 from syngas. Subsequently, the treated synthesis gas was used in a gas turbine (ITG) plant. The flue gases expanded in the gas turbine were introduced into the heat recovery steam generator (HRSG) for steam production and utilization in a steam turbine for mechanical work and subsequent power generation. The biomass (poplar) gasification process was analysed for different air equivalent ratio (ER). The highest lower heating value of the synthesis gas was obtained for ER = 0.2. In the case of CO 2 capture based on DES, a thermal energy consumption of 1 GJ/tCO 2 was determined, this represents an electrical energy consumption of 0.4 GJ/tCO 2 . In terms of electricity production, for a syngas flow rate of 20 t/h, the maximum power obtained was of 10.8 MW, and the net cycle efficiency of 30 %.