Simulation And Experimental Study On Combustion Performance Of Regenerative Biomass Gasification And Combustion Integrated Furnace

Biomass energy has a broad application prospect as a clean and pollution-free renewable energy.Biomass gasification technology has attracted much attention due to its economic significances and high efficiency with large-scale industrial application prospects.The key of biomass gasification is temperature.How to provide high temperature and efficient heat source for biomass gasification is one of the research priorities.From this point of view,a regenerative biomass gasification and combustion integrated process is proposed,and a corresponding regenerative integrated furnace is designed rationally.The combustion and heat transfer performance of biomass in the furnace and regenerator is simulated and experimentally studied.The combustion and heat transfer performance of the whole furnace under different working conditions is analyzed,and high temperature and efficient heat source is provided for biomass gasification.The biomass gasification can be in a high temperature environment for a long time and produce high quality gas continuously.The integrated process of biomass gasification combustion is composed of biomass gasification technology and regenerative combustion technology.The biomass gasifier is designed as a honeycomb ceramic regenerator structure,and it is closely combined with the biomass combustion furnace.The high temperature flue gas generated by biomass combustion is absorbed by regenerator and provides high temperature heat source for biomass gasification.On the basis of the numerical simulation of pulverized coal combustion,this paper simulates the combustion of biomass powder by the modified sub model,and studies the combustion of biomass powder and the regenerative performance of the regenerator under the different excess air coefficient and the secondary air mixture ratio,and explores the best combustion and regenerative conditions.And built regenerative biomass gasification and combustion integrated furnace pilot test bench to verify the accuracy of the simulation results and explore the feasibility of the whole process.The simulation results showed that with the increase of excess air factor?,the biomass combustion temperature increased first and then decreased,reaching the maximum at?=1.2.With the increase of?,the surface heat transfer coefficient of regenerator increases,so as the internal temperature of regenerator.Meanwhile,a reasonable proportion of secondary air can effectively enhance the combustion intensity,and the combustion intensity is the largest when the secondary air occupies 50%of the total air volume.With the increase of the secondary air ratio,the NO_X pollutants decrease and CO pollutants increase.The error between experiment and simulation is within 10%,which verifies the accuracy of the simulation results.At the same time,with the increase of?,the overall heating rate of combustion chamber and regenerator increases first and then decreases.The maximum heating rate is at?=1.2.In the end,the calorific value of gasification synthetic gas obtained by biomass gasification is 13.48 MJ/m3,which validates the feasibility of the integrated process of regenerative combustion and gasification and lays a foundation for large-scale industrial application.