The object

reheater of utility boilers

has properties of large time delay

big inertia

and nonlinearity of parameters

so it is very difficult to get an accurate mathematical model under the background of noise.On the basis of analysing the propcess mechanism of reheated steam temperature

a signal of heat disturbance for reheated steam has been constructed

and a signal reconstruction method of reheated steam temperature based on LMS algorithm being proposed.Furthermore

a finity impulse(FIR) model has been obtained from LMS filtering

approaching to the combustion disturbance in the inertia part of the reheater

so the original signal can more accurately be resumed.