Study on biomass gasification and natural gas integrated chemical looping combustion power system

In this work, a biomass gasification integrated natural gas power generation system using chemical looping technology (CCLPS) is established to avoid the low efficiency of biomass power systems with negative CO2 emission. A supplementary combustion power system (CLSPS) is proposed using chemical looping combustion with H2 cogeneration to improve the system efficiency. The combustion temperature, pressure and supplementary temperature are the key factors affecting the power efficiency of systems. The optimal combustion temperature and pressure of CCLPS and CLSPS are 1100 °C, 10 bar and 1400 °C, 25 bar, respectively. When the biomass blending ratio varies from 0.1 to 0.9, the power efficiencies of CCLPS and CLSPS are 31.1 %∼50.6 % and 38.9 %∼54.5 %. The exergy analyses show that the topping cycle subsystem has the highest exergy destruction, followed by the gasification subsystem. The sum of the topping cycle and gasification subsystems account for 70 %∼85 % of the total exergy destruction. The bottoming cycle has relatively small exergy destruction and the highest exergy efficiency. The exergy destruction of the carbon capture subsystem is the lowest, which accounts for about 6 %. The results will contribute to the development of biomass conversion technology and apply solutions to promote sustainable bioenergy systems.