A mathematical model of the steam superheater exchanger with distributed parameters has been developed. Scale deposits were assumed to be present on the internal tube surfaces. It was assumed that the inner tube surfaces are covered by a thin layer of scale deposits. The finite volume method was used to solve partial differential equations describing flue gas, tube wall and steam temperature. The developed modeling technique can especially be used for modeling tube heat exchangers when detail information on the tube wall temperature distribution is needed. The numerical model of the superheater developed in the paper can be used for modeling of the superheaters with complex flow arrangement accounting scales on the internal tube surfaces. Using the model proposed the detailed steam, wall and flue gas temperature distribution over the entire superheater can be determined. The steam pressure distribution along its path flow and the total heat transfer rate can also be obtained. The calculations showed that the presence of scale on the internal surfaces of the tubes cause the steam temperature decrease and the heat flow rate transferred from the flue gas to the steam. Scale deposits on the inner surfaces of the tubes cause the tube wall temperature growth and can lead to premature wear of tubes due to overheating.

JO - Archives of Thermodynamics L1 - http://www.czasopisma.pan.pl/Content/94466/PDF/05_paper.pdf L2 - http://www.czasopisma.pan.pl/Content/94466 PY - 2013 IS - No 4 December EP - 91 KW - Steam superheater KW - Scale deposit KW - Heat exchanger numerical model A1 - Trojan, Marcin A1 - Taler, Jan PB - The Committee on Thermodynamics and Combustion of the Polish Academy of Sciences JF - Archives of Thermodynamics DA - 2013 T1 - Effect of scale deposits on the internal surfaces of the tubes on the superheater operation SP - 73 UR - http://www.czasopisma.pan.pl/dlibra/docmetadata?id=94466 DOI - 10.2478/aoter-2013-0030 ER -