Numerical Investigation On Laminar Premixed Combustion Characteristic Of Syngas Derived From Biomass

With the growing energy problems,renewable energy to become the focus.Biomass is a new energy source,and it has the advantages of wide distribution,low cost,low carbon and environmental protection.At present,There are many ways of biomass utilization,biomass pyrolysis and gasification are one of them.Biomass pyrolysis and gasification will produce a lot of low calorific value gas.Due to biomass gasification syngas composition of diverse,variable volume fraction,low calorific value,the use of Syngas Derived from Biomass in many occasions is limited,and can not even be applied.In order to make it suitable for more occasions,the first is to fully understand their flame characteristics.The syngas,one-dimensional laminar premixed flame was modeled using the PREMIX model from CHEMKIN software,in this research background.By simulating the syngas at different operating conditions,it is concluded that the laminar premixed flame speed of syngas is the fastest in the equivalence ratio of 1.2 to 1.4.The net heat production from gas-phase reactions is the highest at this time.When the equivalence ratio is 1,the highest flame temperature is the highest.When the temperature of unburned gas increases,flame speed and overall temperature distribution increase,increase of unburned gas component in product area,and unburned gas temperature on the net heat production from gasphase reactions has little effect.It shows that the increase of the temperature of unburned gas has an inhibitory effect on the reaction.With the pressure increases,the flame speed decreases,the overall temperature distribution increases,the net heat production from gas-phase reactions increase.the component of unburned gas in the product area becomes smaller.Ambient temperature and inlet velocity have little effect on flame speed.In this paper,methane,hydrogen and carbon monoxide are mixed with syngas respectively and studied.As the proportion of methane gas is increased,the flame speed propagation is reduced.Overall increase in temperature distribution.There is no effect on the net heat production from gas-phase reactions and uncombustible gas component increase.With the increase of the addition of hydrogen,the flame speed will rise obviously,the highest reaction temperature will rise with it,the net heat production from gas-phase reactions is higher than that of methane gas,the component of unburned gas rises slightly.With the increase of carbon monoxide content,the flame speed first increases and then decreases,the temperature distribution goes up as a whole,the net heat production from gas-phase reactions decreases,and the component of unburned gas rises slightly.Finally,the data are verified by relevant literature,which are consistent with the theoretical analysis.