JP2973041B2 - Fluidized bed incinerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluidized bed incinerator for forcibly circulating a fluid medium in the direction of an incombustible discharge port.

[0002]

2. Description of the Related Art Generally, non-combustible substances such as metals as well as combustible substances are introduced into a fluidized bed incinerator. For this reason, the incombustible small lump in which the metal is melted is guided to the outlet by the flow of the flowing medium (sand, etc.), but the incombustible large lump cannot be guided to the outlet by the flowing action of the flowing medium alone and cannot be discharged. Stagnate on the bottom of the furnace, that is, on the dispersion plate. Therefore, in order to circulate the flowing medium along the dispersion plate so as to move toward the discharge port, and to move the non-combustible lump toward the discharge port by this flow, the dispersion plate is inclined downward toward the discharge port. Or by dividing the wind box into multiple parts and controlling the amount of air blown into each divided wind box to be different,
A circulating flow was created in the flowing medium. (See, for example, JP-A-63-271016)

[0003]

In the prior art in which the dispersion plate is inclined downward toward the outlet, it is difficult to control a fluidized bed that generates a circulating flow for moving the non-combustible lump toward the outlet. This is because the layer pressure difference on the dispersion plate varies depending on the location, and if the air volume control is not accurately performed, the flow of the layer may stop. This is a serious problem in the case where the wind box is divided so as to control and supply different air flows to the respective wind boxes.

An object of the present invention is to provide a group of draft tubes in a fluidized bed around a discharge port, and to circulate a fluid medium from the wall of the furnace toward the discharge port by using the draft tubes to remove all non-combustible substances. It is an object of the present invention to provide a fluidized bed incinerator that can lead to an exhaust port and perform efficient dust incineration and incombustible discharge.

[0005]

SUMMARY OF THE INVENTION In order to solve the problems of the prior art, a configuration of the present invention is a fluidized bed incinerator in which incombustibles are sequentially discharged from a discharge port. A large number of draft tubes are provided in a vertical position for circulating the fluid medium from the wall of the furnace body toward the discharge port through the dispersion plate through the dispersion plate.

[0006]

[Operation] In the draft tube disposed in the fluidized bed around the discharge port, the fluidized medium easily jumps out and becomes diluted without being affected by the fluidized medium around the draft tube. The convection circulation of the fluidized bed can be efficiently performed by the concentration difference of the fluidized medium.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a cross-sectional plan view of the incinerator of the present invention, and FIG.
1 is a sectional view taken along line AA of FIG. 1, FIG. 3 is a sectional view taken along line BB of FIG. 1, FIG. 4 is a cross-sectional plan view showing another embodiment of the draft tube arrangement, and FIGS. FIG. 7 is a longitudinal sectional front view of another embodiment in which the upper end of the draft tube is inclined outward.

Referring to the embodiment shown in FIG. 1, FIG. 2 and FIG. 3, reference numeral 1 denotes a furnace main body having an inlet (not shown) for incineration of dust or the like at the upper part. An outlet 4 for the fluid medium 2 and the incombustible lump 3 is formed.
The opposite sides of the discharge port 4 are connected to the lower ends of the discharge grooves 5 which are sequentially inclined upward as the bottom plate reaches the outside. Further, on both sides of the discharge port 4 and the discharge groove 5, a dispersion plate 6 in a horizontal posture is provided. In the figure, 7 is a wind box, and 8 is a blowing pipe for flowing air.

A plurality of draft tubes 9 having a cylindrical structure are arranged in series in a fluidized bed on a dispersion plate 6 near both sides of the discharge port 4 and the discharge groove 5. The draft tubes 9 are in a vertical position, and the draft tubes 9 are connected in series by a connecting member 10 and are attached to the furnace body 1 in a suspended manner.

As shown in FIG. 2, the lower end of the flow of the discharge port 4 is connected to a sorting device 11, and the incombustible lump selected here is discharged and recovered from a flow channel 12. The classified fluid medium 2 such as sand can be appropriately supplied to the free board section 14 of the furnace main body 1 through the flow path 13 by a circulating means (not shown) or the like.

Next, a specific operation will be described with reference to the above embodiment. As shown in FIG. 2, the flowing air blown into the fluidized bed from the dispersion plate 6 flows as bubbles 14 into the fluidized bed. Burns the input dust. On the other hand, the flowing medium 2 guided into the draft tube 9 becomes a thin layer without being affected by the surrounding flowing medium 2 and jumps upward as indicated by an arrow a. Fluid medium 2 which jumps out in the direction of arrow a
As a result, the fluidized bed below the draft tube 9 becomes thin, so that the outer fluidized medium 2 flows forcibly in the direction of arrow b, and forced circulating flow by arrows a and b is continuously generated in the fluidized bed. Occurs.

Aside from the combustibles incinerated in the fluidized-bed furnace,
The incombustible lump 3 such as metal melted inside is sequentially discharged through the discharge groove 5 by the flow action of the flowing medium 2 flowing in the direction of the discharge port 4 on the dispersion plate 6 and the bubble action from the dispersion plate 6. It moves to 4 and is discharged.

A conical non-fluidizing portion c of the non-flowable fluid medium 2 is formed directly above the discharge port 4. The draft tube 9 must be installed so as not to cover the non-fluidizing portion c. is there. In addition, the non-fluidized portion c has an outlet 4
Since the discharging action that flows down the inside is working, the non-combustible
Is efficiently discharged from the discharge port 4 through the discharge groove 5.

The embodiment shown in FIG. 4 corresponds to the discharge groove 5 shown in FIG.
Is provided, a discharge port 4 is opened in the center of the dispersion plate 6, and a large number of cylindrical draft tubes 9 are arranged so as to surround the discharge port 4. The operation in this embodiment is substantially the same except that the non-combustible lump 3 is guided to the discharge port 4 through the discharge groove 5, so that the description of the operation is omitted.

In the embodiment shown in FIG. 5, the cylindrical draft tube 9 shown in FIG. 1 is connected in series by a connecting member 10 and is arranged side by side on the both sides of the discharge port 4. A thin rectangular flat tube 15 is divided by a partition plate 16, and a large number of square tube-shaped draft tubes 17 are formed. The operation of this embodiment is the same as that of FIG.

In the embodiment shown in FIG. 6, a cylindrical draft tube 9 arranged as shown in FIG. 4 is replaced by a square rectangular tube draft tube 18 constructed in the same manner as in FIG. The operation of this embodiment is the same as that of FIG.

FIG. 7 corresponds to FIG. 1, FIG. 4, FIG. 5, or FIG.
5 shows a modified example of the embodiment shown in FIG. 1 and has a structure in which draft tubes 9 and 17 are connected in series as shown in FIGS. 1 and 5 or a structure surrounding the discharge port 4 as shown in FIGS. The upper portions of the provided draft tubes 9 and 18 are inclined toward the furnace wall of the furnace main body 1.

Thus, the draft tubes 9, 17, 1
8, the draft tubes 9, 17,
Fluid medium 2 which passes through and escapes from inside 18 by the draft effect
Is properly discharged toward the side wall of the furnace main body 1 as indicated by an arrow a, and a circulating flow which effectively acts on the non-combustible lump 3 is obtained together with the flow of the arrow b.

[0019]

According to the configuration of the present invention as described above, the following effects can be obtained. (A) The dust introduced into the furnace body is incinerated by the fluidized bed, and incombustible substances such as metals are discharged to the outside from the discharge port as incombustible lump. In the present invention, a vertical draft tube group for convectively circulating the fluid medium from the furnace body wall toward the discharge port is disposed in the fluidized bed surrounding the discharge port, so that the flowing fluid medium is guided into the draft tube, The fluid medium is discharged toward the furnace wall by the effect, and arrows a and b in FIG.
In the fluidized bed, a convective circulation flow is formed in the fluidized bed, and the non-fluidized portion c is dislodged by the circulation flow, and the incombustible mass on the dispersion plate is properly discharged to the discharge port. And incineration without stagnation of incombustible lump can be performed continuously. (C) According to the present invention, there is no need to incline the dispersion plate or divide the wind box unlike the prior art. Therefore, since no air volume control or the like is required, the entire apparatus can be simplified.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of the incinerator of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a cross-sectional plan view showing another embodiment of the draft tube arrangement example.

FIG. 5 is a cross-sectional plan view showing another embodiment of the draft tube.

FIG. 6 is a cross-sectional plan view showing another embodiment of the draft tube.

FIG. 7 is a longitudinal sectional front view of another embodiment in which the upper end of the draft tube is inclined outward.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Furnace main body 2 Fluid medium 3 Noncombustible material 4 Discharge port 6 Dispersion plate 7 Wind box 9 Draft tube 17 Draft tube 18 Draft tube

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23G 5/30 ZAB

Claims (1)

(57) [Claims] In a fluidized bed incinerator in which incombustibles are sequentially discharged from a discharge port, a fluid medium is supplied to a fluidized bed portion near the discharge port from a wall portion of the furnace body through a dispersion plate toward a discharge port. A fluidized bed incinerator comprising a number of vertical draft tubes for convection circulation.