Paper 14: The Response of Power Station Superheaters to Thermal Transients

Distributed parameter transfer functions, derived from heat-balance partial-differential equations for a simple tubular element, are applied to cases of real superheaters having complicated geometry and simultaneous variation of more than one input perturbation. The results of such computations are compared with observations recently made on large C.E.G.B. installations. A digital computer programme has been prepared with which the dynamic characteristics of any new superheater design may be rapidly predicted. Methods of deriving simplified versions of the transfer functions are discussed; such simplified expressions facilitate representation of a superheater on an electronic analogue computer for control system investigations.