Numerical Analysis Of Dynamic Properties Of Regenerative High Temperature Air Combustion System In Coupled Case

High temperature air combustion (HTAC) is a new combustion technology, which can save fuel, enhance the heat efficiency, decrease emission of NOX and reduce the size of equipment. Three chemical reaction models and three radiation models for calculation of HTAC are analyzed and compared respectively in this paper, and the dynamic properties of regenerative high temperature air combustion system in coupled case are analyzed in detail.During the numerical analysis of reaction model, the applicability of present conventional reaction models is analyzed, and the finite reaction rate model is investigated in the calculation of HTAC. Meanwhile, four-step reaction including reverse reaction is taken into account. It could be obtained from the comparison of temperature distribution and pollutant production among three models that the finite reaction rate model is more adaptive for the calculation of HTAC than the Eddy-Break-Up model, and the feasibility of the finite reaction rate model in the calculation of HTAC is proved.During the investigation of radiation model, the present popular three radiation models including P-1, Discrete transfer and Monte-Carlo models are introduced. It can be seen from the analysis of temperature distribution and pollutant production among three radiation models that the Monte-Carlo model could give more effective results than that of the other two.During the simulation of the dynamic properties of regenerative high temperature air combustion system in coupled case, an industrial heating furnace model is selected as the physics model. The influence of burner pitch, air velocity, air preheating temperature, oxygen concentration and fuel velocity on combustion properties are analyzed separately, and the change of combustion properties are analyzed during the burner exchanging.Results in this paper enrich the investigation of HTAC and benefit to improve the calculation accuracy.