Experimental Study On Calorific Value Gas Flameless Combustion

Low calorific value gas is hugely reserved and widely sources.It not only wastes energy,but also pollutes the environment.It is wise to use it in an efficient manner and it helps alliviate the pressure of the energy shortage in our country and.reduce the environmental pollution.The limit of concentration of fuel gas and the effect of gas composition change on the stability of premixed flame restrictes the traditional flame combustion’s application in LCV gas combustion.Flameless combustion eliminated the limit of concentration of fuel gas and has a strong adaptability of composition.It is a efficient mannner using LCV.High temperature oxidation and catalytic combustion are widely used for flameless combustion.The importance of flameless combustion technology has become more highlighted.This study designs the high temperature oxidation experiment and catalytic combustion experimentto investigate the flameless combustion characteristic.The three main results of the work are the following:1.Building flameless oxidation experimentla system:This thesis re-design and transform the experimental system,so that can meet this thesis’s needs.2.High temperature oxidation properties experiment of LCV:High temperature oxidation properties experiment of CH₄、CO、H₂ is made.Based on the above investigation,the properties of high temperature oxidation experiment of hydrogen-enriched CH₄ and hydrogen-enriched CO and synthesis of CH₄/CO/H₂ is completed.The effect of mutal relationship between the syngas composttion and the reason why H₂promotes the combustion are analysed from reaction dynamics.3.Catalytic combustion properties experiment of LCV:Catalytic combustion properties of CH₄,CO,H₂ are studied using experiment bench.In consideration of the effect of H₂O on the catalyst activity,the effect of H₂O on the catalytic combustion properties of CO is investigated from adsorption kinetics.Because of the difficulty of CH₄ catalytic combustion,the properties of syngas with H₂ addition to CH₄is studied.4.Flameless oxidation properties of industrial gas:The above results show that low speed,high temperature and high concentration accelerant the flameless combustion.It not only rises the concentration of radical and the high temperature oxidation reaction rate,but also accelerants the syngas oxidation adding H₂ to the syngas.It helps reduce the emission of CO and increase the energy efficiency.H₂ has the lowest ignition temperature and burnout temperature and it can be used as combustion agent.When additional water vapor is added to the feed stream,the catalyst cativity is inhibited beacause of the formation of hydroxyl on the catalyst surface.The degree of acticity loss over the catalyst is dependent on the water concentration in the feed stream.