Method of drying granular fuel in a fluidized bed combustion pla

Details Method of drying granular fuel in a fluidized bed combustion pla Method of drying granular fuel in a fluidized bed combustion pla

1985-07-02

1987-02-03

Yuen, Henry C.

Furnaces

Process

Burning pulverized fuel

110106, 110238, 432 14, F22B 100

Patent

active

046402055

ABSTRACT:
The conveying properties of a particulate fuel during pneumatic transportation to a fluidized bed in a combustion plant, are improved by at least surface drying of the fuel. A calcium-containing bed material is withdrawn from the bed under such conditions that the bed material is calcined to form CaO. This withdrawn bed material is crushed and mixed with fuel, whereby the CaO absorbs water from the fuel in an exothermic reaction forming calcium hydroxide, Ca(OH).sub.2, the released heat evaporating moisture from the fuel. The fuel particles will have reduced surface moisture which reduces the risk of clogging during pneumatic feeding of fuel to a combustion chamber. Due to the intimate contact between the fuel particles and the crushed bed material, the tendency towards reaction between sulfer in the fuel and the bed material increases.

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