A new method of drum heating determination during start-up of steam boilers

• Autorzy: Taler D. , Dzierwa P.
• Języki publikacji: EN

Abstrakty

EN

A method for determining time-optimum medium temperature changes is presented. Heating and cooling of pressure exposed elements will be conducted in such way, that the circumferential stresses caused by pressure and fluid temperature variations at the edge of the opening and at the point of stress concentration, do not exceed the allowable values. How-ever, the calculated optimum temperature changes are difficult to follow in practice in the initial stage of heating. It is however possible to in-crease the fluid temperature stepwise to the minimum value and then heat the pressure component according to the determined optimum temperature changes. Allowing stepwise fluid temperature increase at the beginning of heating ensures that the heating time of a thick-walled component is shorter, than heating time resulting from the calculations according to EN 12952-3 European Standard or TRD 301 regulations.

Słowa kluczowe

EN

boiler drum; heating optimization; inverse heat conduction problem; least squares method; thermal stresses

PL

metoda najmniejszych kwadratów; naprężenia termiczne; odwrotne przewodzenie ciepła; optymalizacja ogrzewania; walczak kotła

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2009
• Tom: Vol. 30, no. 4
• Strony: 81--95
• Opis fizyczny: Bibliogr. 10 poz.,Rys., wz.,

Twórcy

autor

Taler D.

autor

Dzierwa P.

• Cracow University of Science and Technology, Department of Power Engineering and Environment Protection, Faculty of Mechanical Engineering and Robotics, Al. Mickiewicza 30, 30-059 Cracow, Poland,

Bibliografia

• [1] TRD 301, Technical Standards of Boilers, Heymanns Beuth, Berlin, 2001, 143-185.
• [2] EUROPEAN STANDARD EN 12952-3: Water-tube boilers and auxiliary installations - Part 3: Design and calculation for pressure parts, European Committee for Standardization, Brussels 2001.
• [3] |sc Taler J., Dzierwa P.: A new method for determining allowable medium temperature rates during heating and cooling of thick-walled boiler components, Proc. of the Seventh International Congress on Thermal Stresses, Taipei, Taiwan 2007, Vol. 2, 437-440.
• [4] Dzierwa P.: Optimization of heating and cooling of thick walled pressure components, PhD Thesis, Cracow University of Technology, Dept. of Mechanical Engineering, Cracow, Poland 2007.
• [5] TALER D., TALER J.: Optimum heating of thick plate, Int. Journal of Heat and Mass Transfer, 52 (2009), 2335-2342.
• [6] TALER J., DZIERWA P., TALER D.: Optimum heating of pressure components of large steam boilers, Forschung im Ingenieurwesen, Vol. 73(2009), No. 3, 183-192.
• [7] TALER J., DUDA P.: Solving Direct and Inverse Heat Conduction Problems, Springer-Verlag Berlin, Heidelberg 2006.
• [8] SEBER G.A.F., WILD C.J.: Nonlinear Regression, Wiley, New York 1989.
• [9] PRESS W. H., TEUKOLSKI A., VETTERLING W.T., FLANNERY B.P.: Numerical Recipies in FORTRAN; The Art of Scientific Computing, third ed., Cambridge University Press, Cambridge, 2007.
• [10] BCLSF Subroutine, Chapter 8: Optimization, IMSL MATH/LIBRARY, FORTRAN subroutines for mathematical applications, Vol. 2, Visual Numerics Ina, 1994.