Numerical and Experimental Analysis of Heat Transfer for Solid Fuels Combustion in Fixed Bed Conditions

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.

Analysis of Low-Power Boilers Work on Real Heat Loads: A Case of Poland

“…For many years, the authors of this paper have been researching the improvement of the emission and energy-related parameters in modern solid fuel heating boilers [7][8][9][10][11]. Unfortunately, the recently changing requirements as to the parameters of newly designed equipment do not result in a significant improvement of the air quality.…”

Analysis of heating time and of temperature distributions for cylindrical geometry with the use of solution to the inverse problem

“…Knowledge about the surface temperature allows the atmosphere in the furnace to be adjusted more precisely, which involves diffusion of relevant chemicals to heat treated steel and formation of a surface having desired properties [1]. Inverse problems are used to solve many engineering problems [4][5][6][7][8][9]. Temperature of the heated element can be determined by solving the inverse problem for the heat equation [2,[10][11][12][13][14].…”

Modelling of the cylindrical geometry cooling process based on the solution of the inverse problem

“…Determination of the heat transfer coefficient for the cooling process by solving the inverse problem with the use of the Trefftz method was presented in the paper [15]. Today, inverse problems are widely used to determine the temperature, the heat flux and the heat transfer coefficient in elements of machines and thermal devices during heating and cooling processes [16][17][18][19][20][21][22]. In this paper, numerical research on the solution to the inverse problem for cooling the cylinder is presented.…”