Determination of allowable fluid temperature during start-up operation of outlet header under the assumption of constant and temperature-dependent material properties

• Autorzy: Rząsa D. , Duda P.
• Języki publikacji: EN

Abstrakty

EN

Modern supercritical power plants operate at very high temperatures and pressures. Thus the construction elements are subjected to both high thermal and mechanical loads. As a result high stresses in those components are created. In order to operate safely, it is important to monitor stresses, especially during start-up and shut-down processes. The maximum stresses in the construction elements should not exceed the allowable stresses that are defined according to boiler regulations. It is important to find optimum operating parameters, that can assure safe heating and cooling processes. The optimum parameters define temperature and pressure histories that can keep the highest stresses within allowable limit and reduce operation time as much as possible. In this paper a new numerical method for determining optimum working fluid parameters is presented. In this method, properties of steel can be assumed as constant or temperature dependent. The constant value is taken usually at the average temperature of the operation cycle. For both cases optimal parameters are determined. Based on these parameters start-up operations for both cases are conducted. During entire processes stresses in the heated element are monitored. The results obtained are compared with German boiler regulations - Technische Regeln fur Dampfkessel 301.

Słowa kluczowe

EN

optimization methods; total stresses; steam boilers; heat transfer

PL

metody optymalizacyjne; wymiana ciepła; kotły parowe

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2013
• Tom: Vol. 34, no. 3
• Strony: 3--14
• Opis fizyczny: Bibliogr. 12 poz., il.

Twórcy

autor

Rząsa D.

• Cracow University of Technology, Faculty of Mechanical Engineering, Jana Pawła II 37, Kraków, Poland

autor

Duda P.

• Cracow University of Technology, Faculty of Mechanical Engineering, Jana Pawła II 37, Kraków, Poland

Bibliografia

• [1] Taler J. Duda P.: Solving Direct and Inverse Heat Conduction Problems. Springer-Verlag, Berlin Heidelberg 2006.
• [2] Taler J., Dzierwa P.: A new method for determining allowable medium temperatureduring heating and cooling of thick walled boiler components. In: Proc of the Congress on Thermal Stresses, Taipei 2007.
• [3] Duda P. Dwornicka R.: Optimization of heating and cooling operations of steam gate valve. Struct Multidiscip Optim 40(2010), 529-535.
• [4] Duda P. Rząsa D.: Numerical method for determining the allowable medium temperature during the heating operation of a thick-walled boiler element in a supercritical steam power plant. Int. J. Energ. Res. 36(2012), 6, 703-709.
• [5] Rząsa D., Duda P.: A new method for optimum heating of pressure components in supercritical steam power plant. Arch. Thermodyn. 33(2012), 3, 133-145.
• [6] Schittkowski K.: A FORTRAN subroutine solving constrained nonlinear programming problems. Ann. Oper. Res. 5(1986), 485-500.
• [7] Taler J. Węglowski B. Grądziel S. Duda P. Zima W.: Monitoring of thermal stresses in pressure components of large steam boilers. VGB Kraftwerks Technik 1(2002).
• [8] TRD 301, Technische Regeln für Dampfkessel Carl Heymans Verlag, Koln und Beuth-Verlag, Berlin 1986, 98-138.
• [9] Richter F.: Physikalische Eigenschaften von Stählen und ihre Temperaturabhängigkeit. Mannesmann Forschungberichte 930, Dusseldorf 1983.
• [10] Seber G.A.F. Wild CJ.: Nonlinear Regression. John Wiley & Sons, New York 1989.
• [11] Press W.H., Teukolsky S.A., Vetterling W.T., Flannery B.P.: Numerical Recipes. The Art of Scientific Computing. 2nd edn. Cambridge Univ Press, New York 1997.
• [12] ANSYS r_ 14.0: User manual. ANSYS, Inc.