Device for varying the height of a bed in a fluidized combustion chamber

Claim 2

In an arrangement for varying the height of a bed in a fluidized combustion chamber, comprising: a pressurized housing; hoppers for supplying bed material to said chamber; a single supply line connecting said chamber to said hoppers, said bed material being returned back to said hoppers from said chamber through said supply line; bed material flowing through said single supply line in two opposite directions; said hoppers having means for increasing or decreasing pressure inside said hoppers; a hot-gas filter in each hopper; gas flowing through said gas filter in two opposite directions; gas connection means communicating with each hopper above said filter; said gas connection means being maintainable at a higher or lower pressure than said fluidized combustion chamber; said filter separating solid particles from escaping air upon a pressure decrease in said hopper, a solid particle layer formed on the gas filter surface being blown off when gas flows through the filter in opposite direction for raising pressure in said hopper.

Claim 3

An arrangement as deiined in claim 1, including a preheater communicating with said gas connection means in an empty space inside said fluidized combustion chamber, said preheater heating a medium flowing therethrough to a temperature prevailing inside a hopper.

Claim 4

An arrangement as defined in claim 1, wherein said supply line has a section sloping up at an angle of 10 to 30 degrees to the horizontal upstream of where said section opens into said chamber.

Claim 5

An arrangement as defined in claim 1, wherein said hotgas filter is comprised of ceramic material.

Claim 6

An arrangement as defined in claim 1, wherein said fluidized combustion chamber has converging walls, said hoppers being located directly at said converging walls of said chamber; said hoppers communicating with said converging alls through a siphonshaped slot; said hoppers having an air box with a base provided with nozzles.

Claim 7

An arrangement as defined in claim 5, including distributing means in vicinity of said siphon-shaped slot and supplied with air.

Claim 8

An arrangement as defined in claim 1, wherein said hoppers have walls through which ieed water or steam flows.

Claim 9

In an arrangement for varying the height of a bed in a fluidized combustion chamber, comprising: a pressurized housing; hoppers for supplying bed material to said chamber; a single supply line connecting said chamber to said hoppers, said bed material being returned back to said hoppers from said chamber through said supply line; bed material flowing through said single supply line in two opposite directions; said hoppers having means for increasing pressure inside said hoppers; a hot-gas filter in each hopper; gas flowing through said gas filter in two opposite directions; gas connection means communicating with each hopper above said filter; said gas connection means being maintainable at a higher or lower pressure than said fluidized combustion chamber; said filter separating solid particles from escaping air upon a pressure decrease in said hopper, a solid particle layer formed on the gas filter surface being blown off when gas flows through the filter in opposite direction for raising pressure in said hopper; a preheater communicating with said gas connection means in an empty space inside said fluidized combustion chamber, said preheater heating a medium flowing therethrough to a temperature prevailing hopper; said supply line having a section sloping up at an angle of 10 to 30 degrees to the horizontal upstream of where said section opens into said chamber; said hot gas filter comprising ceramic material; said fluidized combustion chamber having converging walls, said hoppers being located directly at said converging walls of said chamber; said hoppers communicating with said converging walls through a siphon-shaped slot; said hoppers having an air box with a base provided with nozzles; distributing means in vicinity of said siphon-shaped slot and supplied with air; said hoppers having walls through which feed water or stream flows.

Claim 10

In an arrangement for varying the height of a bed in a fluidized combustion chamber, comprising: a pressurized housing; hoppers for supplying bed material to said chamber; a single supply line connecting said chamber to said hoppers, said bed material being returned back to said hoppers from said chamber through said supply line; bed material flowing through said single supply line in two opposite directions; said hoppers having means for increasing pressure inside said hoppers; a hot-gas filter in each hopper; gas flowing through said gas filter in two opposite directions; gas connection means communicating with each hopper above said filter; said gas connection means being maintainable at a higher or lower pressure than said fluidized combustion chamber; said filter separating solid particles from escaping air upon a pressure decrease in said hopper, a solid particle layer formed on the gas filter surface being blown off when gas flows through the filter in opposite direction for raising pressure in said hopper; a preheater communicating with said gas connection means in an empty space inside said fluidized combustion chamber, said preheater heating a medium flowing therethrough to a temperature prevailing hopper; said supply line having a section sloping up at an angle of 10 to 30 degrees to the horizontal upstream of where said section opens into said chamber; said hot gas filter comprising ceramic material; said fluidized combustion chamber having converging walls, said hoppers being located directly at said converging walls of said chamber; said hoppers communicating with said converging walls through a siphon-shaped slot; said hoppers having an air box with a base provided with nozzles; distributing means in vicinity of said siphon-shaped slot and supplied with air; said hoppers having walls through which feed water or stream flows.