JPS60114617A - Fluidized furnace residue discharging device - Google Patents

Abstract

PURPOSE:To discharge effectively only the objective residue also prevent the fluid medium temperature from being carried away without increasing the height of a furnace and without using the means of sand screening and sand returning by a method wherein a screw conveyer is installed in inclined manner, further, an air diffusing means for fluidifying a fluid medium is installed inside the screw conveyer. CONSTITUTION:By supplying a compressed air into an air chamber 513, a fluidizing air is injected into a furnace bed part 1 through a nozzle 3 provided on a furnace bottom part 4 and a nozzle 12 provided on a screw housing 9. Thereby, a sand 6 in a furnace 11 and a sand 15 in the screw housing 9 are fluidized respectively. A sediment reached the lower end part of a screw 8 is moved upward in order with the screw. When the sediment is lifted from a surface 15' of the sand 15, the whole part of the sand 15 is left, finally, the sediment is fallen from a sediment falling port 16 and moved to the next process. As the screw 8 is located in the fluidizing sand 15, there is almost no moving resistance, accordingly, the screw can be rotated by extremely light force, also the sliding ability of the screw for the sediment is made to be smooth exceedingly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a residue discharging device for successively removing residues such as incombustibles generated in the furnace from a trap outside the furnace in a fluidized bed treatment furnace.

1 in a fluidized bed incinerator that incinerates municipal waste, etc.
Residues such as incombustibles present in the waste sink and accumulate at the bottom of the furnace, so it is necessary to sequentially discharge them out of the furnace.

For this reason, conventionally, a closed screw conveyor is placed horizontally below the residue discharge port provided at the bottom of the furnace, and the residue is discharged together with sand, which is a fluidizing medium that does not originally need to be discharged.
Furthermore, the discharged sand is passed through a sand leveling means to separate the residue, and the remaining sand is directly disposed of, and the sand is returned to the furnace using a sand return means such as a packet elevator.

However, with this residue discharge method, if the total distance between the inlet of the screw conveyor and the position of the aeration nozzle installed in the furnace is too small, a part of the air diffused into the furnace will be removed from the screw. -In order to prevent air from blowing into the conveyor and causing the conveyor to stop functioning, the above-mentioned total distance should be made considerably larger to provide sufficient air passage resistance.
And it needs to be taken downwards. Therefore, as a result, the height of the furnace including the screw conveyor becomes high, resulting in an inconvenience.

In addition, heat-resistant equipment such as the sand leveling means and sand returning means is required, making the equipment complex and expensive, and there is also the problem that heat is lost from the sand as it passes through the various equipment. Ta.

In view of these problems, the present invention makes it possible to efficiently discharge only the target residue without increasing the height of the furnace and without using sand sieving means or sand return means, and moreover, it is possible to efficiently discharge only the target residue without increasing the height of the furnace. It is an object of the present invention to provide a residue discharge device that can prevent the residue from being carried away.

Therefore, in the present invention, the screw conveyor is arranged so that the lower end of the screw is located directly below the residue discharge port provided at the bottom of the furnace, and the lower end of the screw is located above the upper surface of the fluidized medium in the furnace. In addition, an aeration means is provided to flow the fluid medium inside the scree conveyor. - Hereinafter, the present invention will be described in detail with reference to the drawings.

The left half of FIG. M1 shows a part of the hearth of an incinerator, and the right half shows an embodiment of the residue discharge device according to the present invention, which is applicable to this furnace.

In the trap shown in the same figure, the hearth part 1 includes a furnace wall 2 and a large number of aeration nozzles 3.
It consists of a furnace bottom 4 provided with a furnace bottom 4, an air chamber 5 disposed below the furnace bottom 4, etc., and sand 6 as a fluidizing medium inside the furnace bottom 4.
is filled. Although only a portion of this hearth portion l is shown, it actually extends largely toward the left side and the front and back sides of the figure.

The screw conveyor 7 used in the apparatus according to the present invention is composed of a screw housing 9 and a screw 5L-8 arranged at a predetermined angle with respect to the furnace wall 2.

The screw 8 is arranged so that its lower end is located directly above the residue discharge port 10 formed in the corner of the furnace bottom 3, and its upper end is lower than the upper surface of the sand 6 in the furnace 11. It is arranged so as to be located above, and the upper and lower ends of its shaft portion are rotatably supported by the screw housing 9. Note that the screens 5--8 are rotated by a drive device (not shown).

As shown in FIG. 2, which is a cross-sectional view taken along line A-A in FIG. It consists of side walls gb, gb and ceiling 9C. The annular portion 9a is provided with a large number of air diffuser nozzles 12 all over its inner surface, and several air chambers 13 isolated from each other are formed in the same outer portion. Also, the ceiling g
cKtExhaust pipe 1 communicating with the inside of the furnace at the upper part of the furnace 11
4 are connected.

The air chambers 13 and the air chambers 5 provided below the furnace bottom 4 are connected to an air source (not shown) via separate dampers (not shown).

Next, the operation of this embodiment will be explained. When pressurized air is supplied to the air chambers 5 and 13, fluidizing air is blown into the hearth part 1 from the nozzle 3 provided in the hearth bottom 4 and the nozzle 12 provided in the screw nozzle 9. ,
This trap causes the sand 6 in the furnace 11 and the sand 15 in the screw housing 9 to flow, respectively. In this case, sand 6
Although sand 15 can be made to have a strong flow, the sand 15 may be made to have a weak flow, and the strength of this flow can be adjusted by the above-mentioned control.

The sand 6 and sand 15 placed in a fluidized state by the ejected air pressure exhibit liquid properties, and the interior of the furnace 11 and the scree housing 9 are communicated with each other via a residue outlet 10. Therefore, the surface 6 of the sand 6 and the surface 15 of the sand 15 are
Always at the same height. This #L image occurs regardless of the difference in flow strength between the sand 6 and the sand 15, and is maintained even when the screw 8 rotates.

With the operation of garbage incineration, etc., residues such as incombustible materials gradually sink to the bottom of the furnace 4. These sediments are collected at the residue outlet 10 at the bottom corner of the furnace by air force or other means.
It further sinks to the upper end of the screw 8. The sediment that has reached the lower end of the screw 8 is gradually lifted up by the screw, leaving all of the sand 15 floating on the surface 15' of the sand 150 (leaving behind it) and passing it through the residue outlet 16 to the next process. falling down to.

If there is an empty can or the like that is partially crushed in the residual liquid, the empty can or the like will be taken out from the residue outlet 16 with some sand inside, but iron pieces, Residues of stones, glass pieces, bricks, etc. will be removed by sand and only they will be discharged.

By the way, since the screw 8 is placed in the flowing sand 15, there is almost no dynamic resistance (therefore, it can be rotated with an extremely light force, and the screw 8 is also extremely smooth against the residue.

The flowing air rising inside the screw housing 9 cools the residue, and the heated air flows into the furnace 11 through an exhaust pipe 14 provided in the ceiling 9C. In this case, the internal pressure of the furnace 11 is maintained at a slightly negative pressure compared to the outside pressure, so the damper 17 interposed in the exhaust pipe 14 is adjusted to prevent air from blowing out from the residue outlet 16. The flow rate can be balanced.

The required pressure of the above-mentioned fluidizing air differs depending on the depth of the sand 15, so the amount of air supplied to each air chamber 13 is adjusted using a damper etc. to create a uniform weak flow of the sand 15X). It is desirable to

If the sand 15 needs to be extracted in small quantities and circulated in the furnace 11 for completely different reasons, since the sand 15 is a liquid, an extraction port ( It is sufficient to sequentially overflow the necessary amount from the (not shown) to a separate furnace i i mm.

Although one screw 8 is used in the above embodiment,
A plurality of screws may be used, and although the flowed air is immediately merged into the furnace, the air may be sucked by a fan or the like and merged into the furnace.

The present invention can be effectively applied to any fluidized fluidized furnace having a structure in which residue is collected at the residue discharge port, and its scope of application is limited to the furnace pressure of the inclined furnace bottom type shown in the example. Never.

According to the present invention, (1) Since sand sieving equipment and sand returning equipment are not required, the structure can be simplified and lowered in cost, and it is possible to prevent not only heat loss due to heat carried away by the sand but also heat loss caused by residue carried away. be able to'.

■ The residue is cooled and discharged, making it easier to dispose of the residue.

■ There is no accident of flowing air protruding from the discharge machine, which sometimes occurred in the past.

■ The screw of the screw conveyor can be rotated extremely easily, and the screw slides extremely smoothly against the residue.

■ ■ The wear of the screw is reduced by 10%.

■ The furnace height including the screw conveyor is greatly reduced.

You can achieve groundbreaking effects such as:

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the residual discharge device according to the present invention, and FIG. 2 is a cross-sectional view taken along line A-Agi in FIG. 1. DESCRIPTION OF SYMBOLS 1... Hearth part, 2... Furnace wall, 3.12-... Amnesty nozzle, 4... Hearth bottom, 5, 13... Air chamber, 6, 15
...Sand, 7...Screw conveyor, 8-...Screw, 9...Screw housing, 10...Residue discharge port, 11...Furnace, 16-...Residue drop port.

Claims (1)

[Claims] The screw conveyor is arranged in an inclined manner so that the lower end of the screw is located directly below the residue outlet provided in the filter paper, and the upper end of the screw is located above the upper surface of the fluidized medium in the furnace. A residue discharging device for a fluidized bed furnace, which is provided with aeration means' (11-) for fluidizing the fluidized medium inside the conveyor.