Method for screening equivalence ratios of combustion gas of foamed ceramic burner

Abstract

The invention provides a method for screening equivalence ratios of combustion gas of a foamed ceramic burner. The method includes the steps that a physical model of the foamed ceramic burner is generated; the radiant heat flux inside media of the foamed ceramic burner is established by the adoption of a diffusion approximation method, the radiant heat flux on the boundary of the foamed ceramic burner is established through a double-flux method, and a solid phase energy equation of the foamed ceramic burner is obtained; a premixed combustion control model of the foamed ceramic burner is established by the adoption of a volume control energy balance method; the premixed combustion control model is disjointed, so that a discrete control model is obtained; numerical simulation is conducted on premixed combustion of the foamed ceramic burner under all the candidate combustion gas equivalence ratios according to the discrete control model and the physical model; all the candidate combustion gas equivalence ratios are screened on the basis of a preset screening condition according to a numerical simulation result. By the aid of the method, the combustion characteristic inside the burner can be obtained accurately, and the best combustion gas equivalence ratio can be screened out.

Description

technical field [0001] The invention relates to the technical field of foam ceramic burners, in particular to a method for screening the combustion gas equivalent ratio of a foam ceramic burner. Background technique [0002] Premixed combustion in porous media is a complex heat transfer process involving chemical reactions and the coupling of three heat transfer modes: conduction, convection and radiation. Theoretical study of premixed combustion in porous media and the establishment of a mathematical model of combustion are the directions of many researchers. Most researchers have established a combustion mathematical model through appropriate simplification on the basis of experimental research, and then obtained results that are basically consistent with the experiment through numerical calculation methods, verifying the effectiveness of the combustion model. [0003] The numerical simulation of the burner can be used to adjust the combustion gas equivalence ratio so tha...

AI Technical Summary

Problems solved by technology

Because the process of radiative heat transfer is very complicated, it cannot be accurately simulated in the combustion model obtained by traditional technology, and radiative heat transfer has a great influence on important parameters such as flame position, flame temperature, and burning speed in porous media premixed combustion

Therefore, most of the processing methods cannot accurately obtain the combustion characteristics in the burner, so adjusting the combustion gas equivalent ratio cannot achieve better results

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