Abstract
The paper concerns the analysis of the heat transfer process that occurred during solid fuel burning in fixed bed conditions. The subject of the analysis is a cylindrical combustion chamber with an output of 12 kW heating power equipped with a retort burner for hard coal and biomass combustion. During the research, a numerical and experimental study is performed. The analysis is prepared for various heat load of the combustion chamber, which allowed for the reconstruction of real working conditions for heating devices working with solid fuels combustion. The temperature distribution obtained by the experimental way is compared with results of the numerical modeling. Local distribution of principal heat transfer magnitudes like a heat flux density and a heat transfer coefficient that occurred on the sidewall of the combustion chamber is analyzed. The analysis showed, that the participation of convection and radiation in the overall heat transfer process has resulted from the heat load of the heating device. Research results may be used for improving an analytical approach of design process taking place for domestic and industrial combustion chambers.
Highlights
Solid fuel combustion is one of the main sources of thermal energy used for heating purposes by the individual and commercial sector in Poland
The mentioned approach does not show sufficient accuracy for viable modeling of conditions that occurred near combustion chamber walls which are necessary for modeling a heat transfer process
The proposed research is concerned with the investigation of the heat transfer phenomenon that occurred in a near-wall region of the combustion chamber
Summary
He has obtained a gas temperature profile inside the combustion chamber located above a fixed bed with the assumption of constant temperature for furnace walls He investigated the accuracy of a solution for different radiation heat transfer models. The issue of heat transfer phenomenon occurring in a wall neighborhood and free-room of a combustion chamber during fixed-bed combustion still has not been deeply recognized like it is realized in other types of thermal devices used for different industrial applications, like heat treatment furnaces [23,24,25], heat storage systems [26,27,28], or heat exchangers [29,30,31]. The mentioned approach does not show sufficient accuracy for viable modeling of conditions that occurred near combustion chamber walls which are necessary for modeling a heat transfer process
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