초록 ▼

Method in combusting solid fuel in a first fluidized bed (11) and a second fluidized bed (12) located laterally of the first bed, said beds being mutually separated but communicating with each other. Fuel particles are transferred from the first bed to the second bed. The first bed is operated subst

Method in combusting solid fuel in a first fluidized bed (11) and a second fluidized bed (12) located laterally of the first bed, said beds being mutually separated but communicating with each other. Fuel particles are transferred from the first bed to the second bed. The first bed is operated substoichiometrically and the second bed is operated with a large excess of air. Flue gas from the first bed is diverted in a common freeboard over the beds to be directed in counterflow towards the flue gas from the second bed. Heat power is recovered solely from the second bed.

대표청구항 ▼

Method of combusting solid fuel in a first fluidized bed and a second fluidized bed located laterally of the first bed, said beds being mutually separated but communicating with each other, a common freeboard being provided above the beds, the method comprising the steps of: (a) operating the first

Method of combusting solid fuel in a first fluidized bed and a second fluidized bed located laterally of the first bed, said beds being mutually separated but communicating with each other, a common freeboard being provided above the beds, the method comprising the steps of: (a) operating the first bed substoichiometrically; (b) positively directing flue gas from the first bed towards the second bed in said common freeboard in counterflow to the flue gas from the second bed to direct fuel particles entrained in the flue gas from the first bed towards the second bed; (c) regulating the height of said first and second beds to cause overflow of fuel particles from said first to said second bed; (d) supplying particulate material from said second bed to said first bed by removing material from the bottom of the second bed and supplying it to the bottom of the first bed; (e) operating the second bed with large excess of air; (f) efficiently mixing the flue gases from the two beds; and (g) recovering heat power by heat exchange solely from said second bed.