JPS63231112A - Fluidized bed type incinerator - Google Patents

Abstract

PURPOSE:To increase combustion load and prevent unburning and solidification by a method wherein a fluidized bed type incinerator for sludge comprises a horizontally rotating drum intersecting supply direction at right angles in the inner part of a sludge supply hole and having a plurality of radial distributing members around its surroundings so that the sludge cast into the incinerator. CONSTITUTION:Sludge transported by a screw conveyor not indicated in a drawing is charged into a chute 7 and then distributed in the axial direction of a horizontally rotating drum 9 by an oscillating distributor not indicated in the drawing. The masses of the sludge are crushed by rotational distributing members 10a, 10b and at the same time cast into an incinerator 1 through a sludge supply hole 8. At that time, high pressure air is ejected from an vent hole 21 and the promotion of sludge distribution and prevention of sludge sticking to the members 10 are carried out. By this constitution, combustion load can be increased and the unburning and solidification of the sludge can be prevented.

Description

Detailed Description of the Invention (Industrial Field of Application) This invention incorporates an inorganic heating medium particle layer in a furnace, and transforms this heating medium particle layer into a fluidized bed by fluidizing air introduced from below into the furnace. The present invention relates to a fluidized bed incinerator that performs incineration by supplying sludge through a sludge supply port opened in the furnace wall above the fluidized bed.

(Prior art) An injection device that injects high-pressure air or high-pressure steam in an adjustable direction in a desired direction is installed around the tip of the screw tweeter that transfers sludge to be incinerated to the sludge supply port, and the injection device is installed to inject high-pressure air or high-pressure steam in a desired direction while crushing the sludge. It was established in 1973 that the supply was uniformly distributed in the furnace.
5589:1 is publicly known.

(Problems to be solved by the invention) Since the above-mentioned device supplies sludge into the furnace using only high-pressure air or high-pressure steam, a large amount of high-pressure air or high-pressure steam may be required depending on the physical properties or amount of sludge. In this case, the air ratio may become excessive, making it impossible to take full advantage of the advantage of the fluidized bed incinerator, which allows the air ratio to be reduced.

Also, if high pressure 7A air is used, a heat source is required.

(Means for Solving the Problems) Therefore, the present invention provides a horizontal rotating drum perpendicular to the sludge supply direction at the back of the sludge supply port opened in the furnace wall above the fluidized bed of a fluidized bed incinerator. - A plurality of dispersion members are installed radially around the wooden flat rotary drum, and the horizontal rotary drum is rotated in a direction in which the dispersion members dredge the sludge at the bottom of the sludge supply port and release it into the furnace. It is characterized by

(effect)? The sludge that has moved to the mud supply port is dispersed into the furnace by the rotation of the floating rotating drum using dispersion members installed radially around it.

(Example) In the illustrated example, 1 is a fluidized incinerator, and a rectifier 2 blows out fluidized air at the bottom of the furnace, and this air causes a layer of inorganic heat medium particles filled in the furnace to flow. The layer 3 is formed and the sludge fed into the furnace by the screw conveyor 4 is burned.

Reference numeral 5 indicates a starting hole, and 6 indicates an auxiliary combustion burner port.Since these have conventionally been attached to a fluidized bed incinerator, their explanation will be omitted here.

A downward chute 7 that creates an effective head is connected to the discharge end of the screw conveyor 4, and the lower end of this chute 7 is bent sideways and connected to a sludge supply port 8 that opens in the furnace wall above the fluidized bed 3. do.

In this embodiment, a floating rotary drum 9 is installed in the lower end of the chute 7 connected to the sludge supply port 8, and is perpendicular to the sludge supply direction. The dispersion members 10 are mounted radially, and the drum 9 is driven by a motor and a variable speed reducer 11 to rotate in the direction of the arrow, that is, in the direction in which each row of the dispersion members dredges up the sludge at the bottom of the chute 7 and releases it into the furnace. .

As shown in Figure 3.4, each row of dispersing members is connected to a drum 9.
are installed radially at predetermined equal intervals in the axial direction of the
In this case, the dispersing members 10a of one row adjacent to each other in the circumferential direction are located in the middle of the interval between the dispersing members tab of the other row, and the dispersing members 10a of each row are located at the left end of the drum. The closer the right end, the more the firing surface faces to the left, and the more the right end, the more the firing surface faces to the right, and the more centrally located, the more the firing surface faces to the front, thus almost covering the entire area inside the furnace. It is preferable to be able to supply sludge uniformly. In addition, in response to this, the opening area of the sludge supply port 8 is expanded vertically and horizontally toward the inside of the furnace as shown in the figure, and the width of the chute 7 is considerably wider than the diameter of the screw conveyor 4.
In the middle of the chute, there is a distributor 12 that rotates back and forth from side to side with a set of automobile wipers to evenly distribute the sludge falling from the screw conveyor into the chute in the axial direction onto a horizontal rotating drum.
In order to prevent the sludge caught between the dispersing members 10 from rolling back, it is preferable to provide comb-shaped fixed blades 13 positioned at intervals between all the dispersing members.

The horizontal rotary drum 9 is hollow in this embodiment, passes through the chute 7, and is rotatably supported at each end by bearings 15 on support plates 14 provided on the left and right outer sides of the chute. The inner circumference of the through hole and tram is ml)! l
A wearable seal 16 rotatably closes. An air blowing pipe 17 penetrates along the center of this horizontally rotating drum 9. Two partition plates ta, ta are attached to the outer periphery of the blow-off pipe 17, one facing downward and the other facing the sludge supply port 8, the tip of which slides into contact with the inner periphery of the horizontal rotating tram 9. Forming an air chamber 19 with a substantially fan-shaped cross section,
The blowout pipe t7 is a blowout port 1 that blows out air into the air chamber 19.
7'.

The horizontal rotating drum 9 and the blowout pipe 17 are relatively rotatable,
In order to prevent the blow-off pipe 17 from rotating, an air supply pipe 20 is connected to the end of the blow-off pipe 17 protruding from one end of the horizontal rotating drum 9 and supplies air from a blower or the like into the blow-off pipe to the support plate 14. Fixed against.

Further, on the outer periphery of the horizontal rotating drum 9, one or more ventilation holes 21 are provided at the roots of the front surfaces of the respective dispersion members 10 standing radially. Note that a wear-resistant seal 22 is also used to rotatably close the space between the blow-off pipe 17 and the through hole through which it passes through the end surface of the horizontal rotating drum 9. Said seal 16.2
In 2, it is preferable to use asbestos or the like containing carbon to lubricate the rotation.

As a result, the sludge transferred by the screw conveyor 4 falls from its discharge end into the chute 7, and is effectively dispersed in the axial direction of the horizontal rotating drum 9 by the distributor 12 operating in the direct swing operation in the chute. The distributed sludge is in the form of clumps that correspond to the dimensions of the screw conveyor, but as the horizontal rotating drum rotates, the dispersion members lO... attached radially around the outer periphery break up the clumps and at the same time It is scattered as small lumps in various directions inside the furnace through the supply port 8 and thrown. In this case, high-pressure air is blown out from the vent hole 21 communicating with the air chamber 19 in the horizontal rotating tram 9, which supplements the effective dispersion of the sludge pellets and at the same time
Prevents sludge from adhering to and remaining on the surface of... or,
This air also helps cool the rotating drum.

The rotational speed of the horizontal rotating drum 9 is appropriately determined according to the dimensions of the furnace body, the amount of sludge supplied, etc., so that the sludge is evenly distributed within the furnace.

In addition, the chute 7 is designed to prevent bridging from occurring inside the lumpy fO mud that falls from the output end of the screw conveyor 4.
Further, the shape and dimensions are appropriately determined so that each dispersion member 10 can be well hit.

Also, even if air is blown from the blow-off pipe 17 into the air chamber 19 in the horizontal rotating tram 9 and is injected outside from the vent hole 21 on the outer periphery of the drum, the air is ejected through the partition plate 18.1.
Since the air is partitioned into 8 parts and restricted to the inside of the furnace, the amount of air used is small. It does not take away from the advantage that "it can be done easily."

(Effect of the invention) According to the present invention, the combustion load per unit hearth (area) of a fluidized bed incinerator is approximately twice as high as that of a fluidized bed incinerator that does not have a sludge dispersion mechanism. becomes. Further, localized unburnt solidification within the furnace does not occur at all.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view of an embodiment of the fluidized bed incinerator of the present invention, FIG. 2 is an enlarged cross-sectional view taken along the line ■-■ in FIG. 1, and FIG.
The figure is a plan view from below of the horizontal rotating drum, FIG. 4 is a vertical side view of the floating rotating drum, and FIG. 5 is a longitudinal front view of one end of the horizontal rotating drum. is a rectifier,
3 is a fluid, 8 is a sludge supply port, 9 is a water rotating drum, 1
0 indicates a dispersion member.

Claims (2)

[Claims] (1) An inorganic heating medium particle layer is built into the furnace, and this heating medium particle layer is made into a fluidized bed by fluidized air introduced into the furnace from below, and a sludge supply port is opened in the furnace wall above the fluidized bed. In a fluidized bed incinerator that supplies sludge and incinerates it, a horizontal rotating drum is installed at the back of the sludge supply port perpendicular to the sludge supply direction, and a plurality of sludge particles are dispersed radially around the horizontal rotating drum. A fluidized bed incinerator characterized in that a member is attached to the dispersion member, and the horizontal rotating drum is rotated in a direction in which the dispersing member dredges up sludge at the bottom of the sludge supply port and dumps it into the furnace. (2) In the fluidized bed incinerator according to claim 1, the horizontal rotating drum is hollow and air is supplied inside;
The fluidized bed incinerator has an air outlet located at the base of the dispersion member on the outer periphery of the drum.