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

Taler D., Dzierwa P.

Archives of Thermodynamics

2009

Vol. 30, no. 4

81-95

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.