To study the fluctuation mechanism of the furnace pressure and to quantitatively analyze the influence of various disturbance factors on furnace pressure

a characteristic analysis method of furnace pressure based on independent component analysis(ICA)

multi-scale delay correlation and spectrum analysis was proposed. Firstly

the fluctuation of furnace pressure was regarded as the superposition of various independent fluctuation components

and the independent fluctuation components were obtained by using ICA. Secondly

the disturbance factors of furnace pressure were matched with the independent components by using multi-scale delay correlation to determine the corresponding perturbation source of each independent component. Finally

the spectrum analysis was used to obtain the dynamic gain of each disturbance source to the furnace pressure fluctuation. The analysis results of a 600 MW pulverized coal boiler show that

the furnace pressure fluctuation is more closely related to the intermediate frequency component of the primary air

forced-draft air and induced-draft air than that of the coal feed. The unit forced-draft air fluctuation and unit induced-draft air fluctuation has the same effect on furnace pressure

but the effect of changing unit primary air on the furnace pressure is greater than that of changing unit forced-draft air or unit induced-draft air.