JPH08262191A - Seal structure of device for throwing waste into waste melting furnace - Google Patents

Abstract

PURPOSE: To suppress the fluctuation of pressure in a waste melting furnace, stabilize the combustion state in the furnace, and prevent leakage of, for example, a combustion exhaust gas when opening the damper at the entrance of the waste melting furnace. CONSTITUTION: A shield body 1 surrounds a bucket 21 held by the chuck of a bucket elevation device 2 and at the same time is adhered to the bucket 21 at the upper edge via the bucket elevation device 2 and a packing 11. The body 1 adhered to the peripheral edge of an upper surface opening 32 of a damper room via the packing 21 at the lower edge, thus completely shielding a space surrounded by a closed hood 5 and a damper room 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved seal structure for a device for inputting wastes to a waste melting furnace, particularly hazardous wastes and radioactive wastes.

[0002]

2. Description of the Related Art Conventionally, as a seal structure of a waste charging device for a waste melting furnace, a seal structure as shown in FIG. 5 is known, for example, from Japanese Patent Application Laid-Open No. 2-298896. According to this, the closed hood 5 is provided above the waste melting furnace 4, and the bucket 21 containing the waste is lowered into the furnace in a state of being sealed above the closed hood against the outside air. The bucket lifting device 2 is provided. In the case of this device, a space sufficient for moving the traveling carriage 51 and the traveling carriage is provided inside the closed hood, and an opening provided in the upper portion of the waste melting furnace 5 so that the bucket 21 can pass therethrough. Slide damper 3 that opens and closes
Since it also houses 1'and its operating mechanism, it has to occupy a considerably large volume.

When operating such a waste melting furnace, the inside of the furnace is maintained at a slight negative pressure, for example, about minus 200 mmAq, so that combustion gas and unburned substances in the furnace do not leak to the outside. It is designed to lead to a given exhaust gas treatment device. However, when the slide damper 32 provided at the upper opening of the waste melting furnace is opened in order to lower the bucket 21 containing the waste into the furnace, the air inside the closed hood 5 is discharged into the furnace. As a result, the pressure inside the furnace fluctuates in the direction approaching the atmospheric pressure, so that the combustion state inside the furnace may become unstable, and the combustion exhaust gas may flow back into the closed hood 5.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a damper provided at the inlet of a waste melting furnace for lowering a bucket containing waste into the furnace. By suppressing the fluctuation of the pressure in the furnace that occurs when it is opened as much as possible, the combustion state in the furnace is kept stable,
Moreover, the purpose is to prevent combustion exhaust gas and the like from leaking from the opening in the upper part of the melting furnace.

[0005]

[Means for Solving the Problems] The above-mentioned problems are solved by providing a bucket lifting device for lowering a bucket containing wastes to the inside of the melting furnace above the waste melting furnace. Is provided with an opening through which the bucket can pass, and a damper chamber having an opening through which the bucket can pass and which accommodates a damper that can open and close the opening on the upper surface of the opening. In the waste throwing apparatus for the waste melting furnace in which the above is arranged, the bucket chucked by the bucket elevating device is surrounded and slidably close to the outer peripheral surface of the bucket elevating device at the upper end, and at the lower end, By the seal structure of the waste feeding device for the waste melting furnace, which is provided with a shield body which can be brought into close contact with the periphery of the upper opening of the damper chamber. It is possible to attain.

[0006]

Next, the present invention will be described in detail with reference to the illustrated embodiments. (Example 1) In FIGS. 1 and 2, the waste melting furnace 4 is used.
A bucket raising / lowering device 2 for lowering the bucket 21 containing hazardous waste or radioactive waste into the inside of the melting furnace is disposed above. The bucket lifting device 2 comprises a cylindrical case, a chuck 22 for gripping the bucket 21 is provided so as to project from the lower surface in a sealed state, and an operating unit (not shown) for operating the chuck 22 is built-in. There is. An opening 41 through which the bucket can pass is provided in the upper portion of the melting furnace, and a damper 31 is provided on the upper surface of the opening. Normally, the opening 41 is closed as shown in FIG. Combustion gas, etc. are prevented from flowing upward from the inside. Further, when the bucket 21 is lowered to the inside of the melting furnace, the damper 31 is slid by the piston 33 as shown in FIG.
Can be raised and lowered.

A damper 31 for opening and closing the opening 41
Are housed in the damper chamber 3 together with the slide operating device. The damper chamber 3 has the bucket 21 at the top.
Has an opening 32 through which it can pass vertically, and is always in communication with the space surrounded by the upper sealed hood 5,
The other part constitutes a sealed space. The closed hood 5 is located above the damper chamber 3 and surrounds a group of devices such as a traveling carriage 51 that conveys the bucket 21.
A bucket lifting device 2 through a packing at the upper part thereof
Is slidably positioned. In addition, in FIG. 2, the bucket lifting device 2 is lifted upward, and
Is set just below the bucket lifting device 2 by the traveling carriage 51, and the opening 41 is closed by the damper 31.

The shield body 1 in this embodiment is a cylindrical case made of heat-resistant steel such as stainless steel, the top and bottom of which are open, and the inner diameter of which can accommodate the bucket lifting device 2 and the bucket 21. It is set to dimensions. In the state of FIG. 2, the shield body 1 is slidably in close contact with the bucket lifting device 2 via the packing 11 at the upper end of the shield body 1 in the state where the bucket lifting device 2 is accommodated. Further, the lower end of the shield body 1 is provided with a packing 12 directed downward for the purpose described later.

Next, from the state shown in FIG. 2, the bucket lifting device 2
1 shows a state in which the bucket 21 is gripped by the chuck 22 and the traveling carriage 51 is retracted, and then the upper end of the shield body 1 is slid to the bucket lifting device 2 and lowered. In this way, when the lower end of the shield body 1 is lowered until it reaches the peripheral edge that surrounds the upper opening 32 of the damper chamber, the shield body 1 becomes the bucket lifting device 2
Of the packing 1 which surrounds the bucket 21 located immediately below, and is in close contact with the bucket lifting device 2 at the upper end via the packing 11, and is directed downward at the lower end.
Since it comes into close contact with the peripheral edge that surrounds the upper opening 32 of the damper chamber via 2, the space surrounded by the closed hood 5 and the damper chamber 3 can be completely cut off.

Subsequently, the damper 31 is slid to open the opening 41 at the upper part of the waste melting furnace 4, and the bucket 21 is lowered into the furnace to throw in the waste in the bucket. However, as mentioned above, shield body 1
The space surrounded by the closed hood 5 and the damper chamber 3
Therefore, the air in the space surrounded by the closed hood 5 does not flow into the furnace through the opening 41.

As described above with reference to the embodiments, according to the present invention, when the damper 31 provided in the opening 41 of the waste melting furnace 4 is opened, the flow of air from the outside to the opening 41 does not occur. Since it is completely shut off by the shield body 1, the outside air does not flow into the furnace through the opening 41, and the air inside the shield body 1 and the damper chamber 3 having only a small space becomes the pressure inside the furnace. Since it only affects, it is possible to suppress the fluctuation of the pressure in the furnace to 1/5 or less compared to the conventional case, and there is a possibility that the combustion state in the furnace becomes unstable or the combustion exhaust gas leaks. It can be resolved.

(Embodiment 2) In the shield body 1 illustrated in FIGS. 1 and 2, an integral metal case structure is shown.
As shown in FIG. 3, which is an explanatory view of the horizontal method cross section of the shield body 1, the shield body 1 is divided into two parts in the vertical direction, and a hinge 13 is provided on one side to be embodied as a structure that can be opened and closed left and right. You can In this embodiment, when the bucket 21 is set immediately below the bucket lifting device 2, the bucket 21 can be housed therein by simply opening and closing the shield body 1 left and right with the hinge 13 as a fulcrum. In this case, there is no need for an elevating mechanism for the shield body 1 and a space for retracting the shield body 1 upward, which is advantageous in that the height of the entire apparatus can be designed to be low.

(Embodiment 3) Further, the shield body 1 of the present invention.
As shown in FIG. 4, the side wall 14 can be embodied in a bellows-like structure that is vertically expandable and contractible. In this case, the height of the shield body 1 can be expanded and contracted as needed, so that the height of the closed hood 5 can be designed lower than that of the first embodiment, and the entire device can be designed compactly. is there.

[0014]

As described above, according to the seal structure of the present invention, when the damper provided at the inlet of the waste melting furnace is opened, it is possible to suppress the fluctuation of the pressure in the furnace as much as possible. Therefore, the combustion state in the furnace can be stably maintained, leakage of combustion exhaust gas and the like can be prevented, and the invention according to claim 2 or 3 has a large industrial value because the entire apparatus can be configured compactly. is there.

[Brief description of drawings]

FIG. 1 is an explanatory view of a vertical cross section of a first embodiment.

FIG. 2 is a vertical cross-sectional explanatory view of the first embodiment.

FIG. 3 is a horizontal cross-sectional explanatory view of the second embodiment.

FIG. 4 is a vertical cross-sectional explanatory view of the third embodiment.

FIG. 5 is an explanatory view of a conventional seal structure.

[Explanation of symbols]

1: shield body, 14: side wall, 2: bucket lifting device,
21: bucket, 3: damper chamber, 31: damper, 32:
Openings, 4: waste melting furnace, 41: openings.

Claims (3)

[Claims] 1. A bucket elevating device for lowering a bucket containing waste to the inside of the melting furnace is provided above the waste melting furnace, and the bucket can pass above the melting furnace. To a waste melting furnace in which an opening is provided, and a damper chamber capable of opening and closing the opening is housed in the upper surface of the opening and a damper chamber having an opening through which the bucket can pass is provided in the upper portion. In the waste throwing device, a peripheral edge that surrounds the bucket chucked by the bucket elevating device, slidably contacts the outer peripheral surface of the bucket elevating device at the upper end, and surrounds the upper opening of the damper chamber at the lower end. A seal structure of a waste feeding device for a waste melting furnace, which is characterized in that a shield body that can be in close contact with the inside is provided. 2. The seal structure for a waste throwing apparatus for a waste melting furnace according to claim 1, wherein the shield body is a shield body which is vertically divided into two and which can be opened and closed left and right. 3. The sealing structure for a waste throwing apparatus for a waste melting furnace according to claim 1, wherein the shield has a bellows-shaped side surface and is a shield which is vertically expandable and contractible.