Numerical method for determining allowable medium temperature during operation of steam gate valve

• Autorzy: Duda P. , Rząsa D.

Warianty tytułu

PL

Metoda numeryczna do wyznaczania dopuszczalnego przebiegu temperatury czynnika podczas pracy zasuwy parowej

• Języki publikacji: EN

Abstrakty

EN

Construction elements of power blocks such as collectors, separators or steam valves work in hazardous environment. During start-up and shut-down operations they are exposed to sudden temperature and pressure changes, that cause high stresses at certain points. Additionally, the cyclic character of loading causes material fatigue, known as low-cyclic fatigue, which may lead to the formation of fracture. Manufacturers of steam boilers provide instructions for heating and cooling processes in order to operate safely. It is important to find the optimum parameters for heating and cooling operations, i.e. parameters that enable to conduct heating and cooling in the shortest time and keep the maximum stresses in the construction within allowable limits. Efforts are made to develop an appropriate method for determining optimum operating parameters during start-up and shut-down phase of the power units. In this paper two optimum parameters will be found. Based on these parameters heating and cooling processes will be carried out and compared with heating and cooling operations processed according to the German boiler regulations Technische Regeln fur Dampfkessel 301 (TRD).

PL

W pracy przedstawiono metodę do wyznaczenia takiego przebiegu temperatury czynnika, aby maksymalne naprężenia cieplne powstające podczas rozruchu lub odstawiania bloku energetycznego nie przekraczały naprężeń dopuszczalnych. Przy założeniu liniowej postaci przebiegu temperatury czynnika poszukiwane są dwa parametry. Przebiegi naprężeń cieplnych uzyskane przy nagrzewaniu lub ochładzaniu, przeprowadzonych według zaproponowanej metody, porównane są z przebiegami uzyskanymi na podstawie Niemieckiej Normy Technische Regeln fur Dampfkessel 301 (TRD).

Słowa kluczowe

EN

thermal stresses; steam boilers; heat transfer; optimization

PL

naprężenia cieplne; kocioł parowy; transfer ciepła; optymalizacja

• Wydawca: AGH University of Science and Technology Press
• Czasopismo: Mechanics and Control
• Rocznik: 2010
• Tom: Vol. 29, no. 3
• Strony: 102--109
• Opis fizyczny: Bibliogr. 10 poz., rys., wykr.

Twórcy

autor

Duda P.

autor

Rząsa D.

• Department of Mechanical Engineering, Cracow University of Technology, Krakow, Poland,

Bibliografia

• [1] Duda P., Dwornicka R. 2008, Optimization of heating and cooling operations of steam gate valve. Proc. International Conference on Engineering Optimization EngOpt 2008, Rio de Janeiro, Brazil, June 2008, Jose Herskovits - Editor, p. 52 (on CD 8 pages).
• [2] Duda P., Taler J. 2009, A new method for identification of thermal boundary conditions in water-wall tubes of boiler furnaces. International Journal of Heat and Mass Transfer, vol. 52, pp. 1517-1524.
• [3] Press W.H., Teukolsky S.A., Vetterling W.T., Flannery B.P. 2007, Numerical Recipes: The Art of Scientific Computing, 3rd ed., Cambridge University Press, Cambridge, ISBN-10: 0521880688.
• [4] Richter F. 1983, Physikalische Eigenschaften von Stahlen und ihre Temperaturabhangigkeit. Mannesmann Forschungberichte 930, Dusseldorf.
• [5] Rusin A., Banaszkiewicz M., Lipka M., Łukowicz H., Radulski W. 2005, Continuous control and optimization of thermal stresses in the process of turbine start-up. Congress of Thermal Stresses, Wienna, Austria, May 2005, pp. 425-428.
• [6] Seber G.A.F., Wild C.J. 1989, Nonlinear Regression. John Wiley&Sons, New York, ISBN-10: 0471617601.
• [7] Taler J., Duda P. 2006, Solving direct and inverse heat conduction problems, Springer-Verlag, Berlin-Heidelberg, ISBN-10: 354033470X.
• [8] Taler J., Dzierwa P. 2007, A new method for determining allowable medium temperature during heating and cooling of thick-walled boiler components. Proc. 7th International Congress on Thermal Stresses, Taipei, Taiwan, June 2007, vol. 2, pp. 437-440.
• [9] Taler D., Taler J. 2009, Optimum heating of thick plate. International Journal of Heat and Mass Transfer, vol. 52, pp. 2335-2342.
• [10] TRD 301 (1986) Technische Regeln fur Dampfkessel, Carl Heymans Verlag, Koln und Beuth-Verlag, Berlin, ISBN-10: 3452254216, pp. 98-138.