Abstract
Analysis of the literary sources showed a lack of data on the pollution, heat transfer, and thermal efficiency coefficients for condensing surfaces with water-fuel emulsions combustion. The study aims to obtain the dependences of heat transfer coefficients, pollution, and thermal efficiency from the wall temperature for condensing low-temperature heating surfaces. Experimental studies on pollution intensity were held on the experimental installation with fuel oils and water-fuel emulsions combustion. In the wet capillary-porous body, together with energy transfer in the form of heat, energy is transferred due to mass transfer. It is necessary to consider the presence of internal sources of heat because, in the layer, there is an additional amount of heat due to the passage of absorption processes and the passage of chemical reactions. The dependences of heat transfer coefficients, pollution, and thermal efficiency from wall temperature have been developed based on the experimental-theoretical data. Analysis of the results has shown that water-fuel emulsions combustion with a water content of 30% increase heat transfer and the cleaning periodicity of heating surfaces. It is recommended to reduce the periodicity between cleaning to 8 h to obtain high values of heat transfer and thermal efficiency for condensing heating surfaces. The obtained dependences of the pollution coefficients for condensing heating surfaces are recommended for use in the standard method for the design calculation of convective heating surfaces of exhaust gas boiler.
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Kornienko, V., Radchenko, R., Bohdal, T., Radchenko, M., Andreev, A. (2021). Thermal Characteristics of the Wet Pollution Layer on Condensing Heating Surfaces of Exhaust Gas Boilers. In: Ivanov, V., Pavlenko, I., Liaposhchenko, O., Machado, J., Edl, M. (eds) Advances in Design, Simulation and Manufacturing IV. DSMIE 2021. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-030-77823-1_34
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