Incinerators

Claim 2

A waste disposal incinerator comprising a. a fluidisable bed of refractory particles; b. a waste inlet positioned so as to allow waste for incineration to be introduced into said bed when fluidised at a point within a fluidised region of said bed; c. means for supplying fluidising gas to fluidise said bed and support combustion of any combustible material in said waste; d. means for supplying fuel as required to maintain combustion; e. a chamber in which hot refractory particles and any noncombustible material are collected for cooling before removal from the incinerator; f. exit for removal of refractory particles and non-combustible material from the incinerator; g. said chamber being at an angle such that when a batch of cool material is removed through the exit, said refractory particles and non-combustible material in the waste remaining in the chamber form a seal preventing substantial escape of fluidising air; and h. means for charging refractory particles to said bed to replace those collected in said chamber.

Claim 3

An incinerator according to claim 1 in which said chamber has an exit for withdrawal of refractory particles and said non combustible material in the waste, said exit being far enough from the area of the chamber into which the hot refractory and non combustible material in the waste pasS to allow removal of cool material through the exit.

Claim 4

An incinerator according to claim 1 in which said fluidising air is arranged to pass in heat exchange with hot gases from the fluidisable bed for pre-heating.

Claim 5

An incinerator according to claim 1 in which waste is arranged to be charged through said inlet by means of a screw conveyor, said screw conveyor being inclined so as to feed the waste upwardly towards the inlet.

Claim 6

An incinerator according to claim 4 in which said screw conveyor is inclined at an angle of 30* to 45* to the horizontal.

Claim 7

An incinerator according to claim 1 in which the refractory particles are sand particles.

Claim 8

A waste disposal incinerator comprising a fluidisable bed of refractory particles, a waste inlet positioned so as to allow waste for inceneration to be introduced into said bed when fluidised at a point within a fluidised region of said bed, means for supplying fluidising air to fluidise said fluidised bed and support combustion of any combustible material in said waste, means for supplying fuel as required to maintain combustion, a chamber in which hot refractory particles and any non-combustible material are collected for cooling a column into which said hot refractory particles and non-combustible material in said waste can be passed from said chamber, a means for supplying fluidising air to said column to fluidise and cool said hot refractory particles and particles in said column, a first fluidising air distributor through which said fluidising air is supplied to fluidise said fluidised bed, a second fluidising air distributor through which said fluidising air is passed to fluidise and cool said hot refractory particles and non-combustible material in said column said chamber being included in a direction from said fluidisable bed to said column so that in operation the overall height of said fluidisable bed is greater than that in said column.

Claim 9

A waste disposal incinerator comprising a fluidisable bed of refractory particles, a waste inlet positioned so as to allow waste for inceneration to be introduced into said bed when fluidised at a point within a fluidised region of said bed, means for supplying fluidising air to fluidise said fluidised bed and support combustion of any combustible material in said waste, means for supplying fuel as required to maintain combustion, a chamber in which hot refractory particles and any non-combustible material are collected for cooling a column into which said hot refractory particles and non-combustible material in said waste can be passed from said chamber, a means for supplying fluidising air to said column to fluidise and cool said hot refractory particles and particles in said column, a first fluidising air distributor through which said fluidising air is supplied to fluidise said fluidised bed, a second fluidising air distributor through which said fluidising air is passed to fluidise and cool said hot refractory particles and non-combustible material in said column said chamber being included in a direction from said fluidisable bed to said column so that in operation the overall height of said fluidisable bed is greater than that in said column.

Claim 10

An incinerator according to claim 7 in which said fluidisable bed and column are connected to a common flue for the fluidising gases.

Claim 11

An incinerator according to claim 7 in which inclined fluidising air distributors are provided at the base of said fluidisable bed and of said column, said distributors being inclined at an angle which exceeds the angle of repose of said refractory bed particles.

Claim 12

An incinerator according to claim 7 in which said column has an outlet for cooled refractory particles and non combustible material in the waste, and a duct for the collection of any cooling air which passes through this outlet instead of up said column.

Claim 13

An incinerator according to claim 10 in which said duct leads to inspection parts for cooling them and/or the said means for charging refractory particles to the bed so said air passes to those means and prevents hot gases from said bed escaping during charging.

Claim 14

An incinerator according to claim 7 in which waste is arranged to be charged through said inlet by means of a screw conveyor, said screw conveyor being inclined so as to feed the waste upwardly towards the inlet.

Claim 15

An incinerator according to claim 12 in which said screw conveyor is inclined at an angle of 30* to 45* to the horizontal.

Claim 16

An incinerator according to claim 7 in which the refractory particles are sand particles.