Directing against the causes resulting in deviation of temperature distribution for exit flue gas from the rotary air preheater of utility boilers

as well as the problems of low-temperature corrosion and ash clogging in the air preheaters

a non-equilibrium control facility and system for inlet flue gas flow rate of air preheaters has been developed.The said system can effectively enhance the low-temperature corrosion resistant ability of the air preheater

providing possibility for further reducing the temperature of discharged flue gas from boilers.Taking the boiler of one 600 MW unit as example

the variation of absorbed heat and temperature of exit flue gas during the lime of varrying the flow rate in small flue duct at initial end and final end has been calculated after adopting the non-equilibium control mode of flue gas flow rate.