Abstract
Self-recuperative burners are a common solution for efficient combustion systems in industrial furnaces. Due to the geometric complexity of the recuperators, a detailed CFD simulation is computationally expensive and not feasible for simulation models of burner-integrated systems such as radiant tubes. Especially in the FSI studies of radiant tubes, the temperature of the radiant tube surrounding the burner is decisive for the final results. The exclusion of the recuperator from the simulation models introduces significant uncertainties in the simulations results. The presented paper describes an innovative, efficient approach to model a fin-type recuperator in which the recuperator is geometrically reduced. The resulting acceleration of the numerical simulation makes a fully dynamic modelling of the recuperator in a radiant tube simulation possible. Specifically designed source terms are used to model pressure loss and heat transfer inside the recuperator to match results obtained with a detailed simulation model. The results show deviations in total heat transfer of less than 1.3% with a 98.5% reduction of numerical mesh size. The computational savings enable comprehensive modelling of air preheat for radiant tube simulations and accurately replicate flow and temperature profiles in the recuperator.
Highlights
In order to make the dynamic modelling of recuperators and their surrounding areas of the radiant tube in future numerical investigations feasible, this paper introduces an efficient model to calculate heat transfer and flow inside a fin-typed heat exchanger of a self-recuperative burner
A high agreement of the models can be observed in the temperature profiles
As the transfer the operating point the porous the flow through theheat described gapisismatched higher infor the detailed model, shown, heat transfer and air preheat temperatures are equal in both cases
Summary
Abstract: Self-recuperative burners are a common solution for efficient combustion systems in inAbstract: Self-recuperative burners are a common solution for efficient combustion systems in dustrial furnaces. Due to the geometric complexity of the recuperators, a detailed CFD simulation industrial furnaces. Due to the geometric complexity of the recuperators, a detailed CFD simulation is computationally expensive and not feasible for simulation models of burner-integrated systems is computationally expensive and not feasible for simulation models of burner-integrated systems such as radiant tubes. In the FSI studies of radiant tubes, the temperature of the radiant tube surrounding the burner is decisive for the final results. The exclusion of the recuperator from the the simulation models introduces significant uncertainties in the simulations results. The resulting acceleration of the numerical simulation makes a fully dynamic fully dynamic modelling of the recuperator in a radiant tube simulation possible. The results show deviations in total heat with a detailed simulation model.
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