An analysis of the steam superheater coil operation depending on different methods of coil support

Piotr Duda,

Łukasz Felkowski


The paper presents the main types of power boiler steam superheater loads together with relevant standards applicable to superheater calculations. In the case of horizontal superheaters, due to their thermal expansion and assembly errors which are the effect of non-uniform support of the hanger tubes, extra loads are generated on the coil pipes. An FEM analysis performed for a selected superheater structure indicates that maximum stress values and the location where the stresses occur depend on the method of support of the superheater tubes. It is shown that maximum stresses in this structural element can be reduced by introducing appropriate tension of hanger bars supporting the superheater hanger tubes.

Słowa kluczowe: power boiler, creep, stress, FEM analysis

[1] Dobosiewicz J., Zbroińska-Szczechura E., Ocena stopnia zużycia ciśnieniowych elementów kotłów pracujących w warunkach pełzania, Energetyka, 12/2007, 917–922.
[2] Laudyn D., Pawlik M., Strzelczyk F., Elektrownie, WNT, 1997.
[3] Dobrzański J., Zieliński A., Pasternak J., Hernas A., Doświadczenia z zastosowania nowych stali do wytwarzania elementów kotłów na parametry nadkrytyczne, Prace IMŻ 62/1, 2010, 51–60 .
[4] Wala T., Hernas A., Dobór materiałów na przegrzewacze referencyjnego kotła nadkrytycznego, Prace IMiUE Politechniki Śląskiej, Book 23, Vol. III, 2009, 221–237.
[5] Sertić J., Kozak D., Konjatić P., Kokanović M., Analytical and numerical investigation of elastic-plastic behaviour of the connecting pipes between header and steam superheater, Proceedings of the 6th International Congress of the Croatian Society of Mechanics, Edited by Smojver, I., Sorić, J., Zagreb the Croatian Society of Mechanics, 2009. 119.
[6] EN 13480-3 Metallic industrial piping. Design and calculation.
[7] EN 12952-3 Water-tube boilers and auxiliary installations.
[8] Felkowski Ł., Duda P., Analiza cieplno wytrzymałościowa wężownicy przegrzewacza pary, Analiza systemów energetycznych, edited by: Węglowski B., Duda P., Wydawnictwo Politechniki Krakowskiej, Kraków 2013, 387–401.
[9] Renowicz D., Plaza M., Plaza B., Renowicz E., Measurement and force adjustment in boiler suspensions and other statically indeterminate mechanical systems, the 14th International Research/Expert Conference, Trends in the Development of Machinery and Associated Technology TMT 2010, Mediterranean Cruise, 11-18 September 2010.