JP2996961B1 - Method and apparatus for charging miscellaneous solid waste in a melting furnace - Google Patents

Abstract

[PROBLEMS] A high-temperature furnace that can be dealt with by one system of charging equipment irrespective of waste in drums, waste in bulk that is taken out of a large iron box, or not originally stored in a container. Provided is a method for charging miscellaneous solid waste in a melting furnace which does not have a movable part therein and does not damage a furnace bottom refractory. SOLUTION: A pallet previously contains miscellaneous solid waste in a container and waste in a loose state, and the box-shaped pallet is hung down at a delivery position before a waste input port of a furnace,
Next, lift the fork through the fork through hole provided on the box-shaped pallet, open the waste input port, put the box-shaped pallet into the furnace, and then retract the box while adjusting the swing angle of the fork. A method of charging miscellaneous solid waste in a melting furnace, wherein a mold pallet is slowly placed on an inclined furnace bottom.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for charging miscellaneous solid waste in a melting furnace mainly used for volume reduction of low-level radioactive miscellaneous solid waste.

[0002]

2. Description of the Related Art As a method of charging miscellaneous solid waste into a melting furnace, there are conventionally a method of charging miscellaneous solid waste in a container and a method of charging miscellaneous solid waste as it is. The method of putting miscellaneous solid waste in a container is 20
It is a method of putting in a 0-liter drum or putting it in an iron box. In the case of a drum, it is lowered from above using a hanging tool such as a tong and placed on the furnace bottom. As a prior art document, there is Kawasaki Heavy Industries: Plasma volume reduction facility pamphlet for radioactive miscellaneous solid waste. While the drum is suspended, the end face is cut and the contents are dropped by gravity. As a prior art document, Decommissioning Technical Report No. 9 (199)
3 years December). Roll it in from the end of a rotary kiln. As a prior art document, there is a pamphlet of Sumitomo Heavy Industries: W + E type industrial waste incineration plant. When the miscellaneous solid waste is charged as it is, it is charged with a supply device such as a pusher.

The above-mentioned method has an advantage that the waste stored in a 200-liter drum can be directly charged, but since the movable part of the hanging tool is also exposed in a high-temperature furnace, heat shielding is required. And cooling means. Therefore, the device becomes complicated and large. In addition, there is no sufficient record of the repeated heat load of the hanging tool (mainly wire) at a high temperature, and there is a concern about safety. The above method and the method repeatedly apply an impact force to the refractory at the bottom of the furnace, and the effect evaluation is not sufficient, and the durability of the furnace is concerned.

[0004] On the other hand, when a drum can and a non-drum can be charged by different methods, not only two charging devices are required, but also the drum can be hung from above with a hanging tool, and the others are damaged to the furnace bottom refractory. In consideration of this, if the injection is performed from the side, two openings of the furnace are required, and the auxiliary equipment of the furnace becomes complicated and large. In addition, with only drum-filled devices, waste that is stored in other small containers or that is not stored in containers needs to be stored in drums, which increases the amount of storage work. However, there is a problem that the amount of waste generated by the drum can increases.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for supplying a single system of waste regardless of whether the waste is contained in a drum, is taken out of a large steel box, or is not originally contained in a container. An object of the present invention is to provide a method and an apparatus for charging miscellaneous solid waste in a melting furnace which can be dealt with by an apparatus, does not have a movable part in a high-temperature furnace, and does not damage a furnace bottom refractory.

[0006]

To solve the above-mentioned problems, a method for charging miscellaneous solid waste in a melting furnace according to the present invention comprises:
The box-shaped pallet previously contains the miscellaneous solid waste in a container and the waste in a loose state, and the box-shaped pallet is hung down at a delivery position in front of the waste input port of the furnace, and then provided on the box-shaped pallet. The fork is lifted through the fork through hole, then the waste inlet is opened, the box-shaped pallet is put into the furnace, and then the box-shaped pallet is retracted while adjusting the swing angle of the fork. Slowly on the inclined furnace bottom ,
Place the fork in the original position while leaving the box-shaped pallet on the inclined furnace bottom.
It is characterized by being evacuated to a location . At this time,
If the main material of the box-shaped pallet is flammable material such as wood or paper, it will be burned when the waste is melted.
It does not increase the amount of waste solidified.

In order to solve the above-mentioned problems, an apparatus for charging miscellaneous solid waste in a melting furnace according to the present invention comprises: a box-shaped pallet provided with a fork through hole; A pallet handling device that hangs down at the front delivery position and a base end of a fork that passes through the fork introduction hole of the box-shaped pallet suspended at the delivery position before the waste input port are pivotally supported at the rear. And a box-shaped package
The pallet carrier has a cylinder for raising and lowering the fork so as to place the pallet, and a drive device for moving the pallet carrier on the rail.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method and an apparatus for charging miscellaneous solid waste in a melting furnace according to the present invention will be described. First, the melting furnace will be described with reference to FIG. 1. Reference numeral 1 denotes a casing constituting a boundary, in which a furnace body 2 of a plasma melting furnace is disposed, and the furnace body 2 is an upper part where the casing 1 is welded. The furnace body 3 and the lower furnace body 4 are divided via water cooling jackets 5 and 6, and the lower furnace body 4 is
The two screw jacks 8 provided on the outer surface of the bottom of the lower furnace body 4 through the bottom of the casing 1 are slidably supported by the hinge 7 on the outside of the mating surface with the hinge 7. The upper ends 8a are connected by hinges 8b, respectively, and the lower drive shaft 9 is connected to a gear motor with brake 11 via a gear box 10. The furnace bottom 12 of the lower furnace body 4 is inclined upward on the tilting side, and a melt discharge port 13 is vertically provided at an end thereof, and has a larger diameter below the discharge port 13 than the discharge port 13. Melt receiving container 14
A hood shell 15 into which is fed is provided integrally with the lower furnace body 4. A plasma torch 16 as a heat source is provided on the upper furnace body 3 so as to be tiltable in all directions by a spherical bearing 17.
Is provided. Reference numeral 19 denotes an exhaust gas duct provided in the upper furnace body 3, which is connected to a secondary combustion chamber (not shown). A waste inlet 20 is provided on the side of the upper furnace body 3 opposite to the melt outlet 13, and a heat-insulating gate 21 and a seal gate 22 are opened and closed at the waste inlet 20 from the furnace side. It is provided as possible.

[0009] However, outside the waste inlet 20, the miscellaneous solid waste input device 25 of the present invention is provided. The charging device 25 is provided with a box-shaped pallet (fork through hole 26
And the box-shaped pallet 27 is moved out of the waste input port 20 at the delivery position 2
Pallet handling device 29 that hangs down from 8
Then, the base end of the fork 30 passing through the fork through hole 26 of the box-shaped pallet 27 suspended at the delivery position 28 in front of the waste input port 20 is pivoted to the rear, and the fork 30 is lowered to the front. A pallet transport trolley 32 on which a cylinder 31 is disposed;
And a drive unit 34 such as a geared motor with a brake for running on the upper side. The box-shaped pallet 27
Is large enough to accommodate a 200 liter drum, and is largely made of flammable materials, and is designed so that the melt does not increase in the furnace. A pallet alignment is provided on the floor at the delivery position 28 in front of the waste input port 20 where the box-shaped pallet 27 is hung down, with a margin corresponding to the play of the fork through-hole 26 and the fork 30 of the box-shaped pallet 27. (Not shown) are provided. The traversing type handling device 29 for hanging the box-shaped pallet 27 to the delivery position 28 includes a hoist 36 running on a rail 35 provided above in a direction orthogonal to the waste input port 20.
And a pallet suspending tool 37 suspended on the hook of the hoist 36. The pallet transport cart 32 travels on rails 33 in a rectangular cylindrical casing 38 connected to the waste inlet 20. When the box-shaped pallet 27 is sent out into the furnace, mechanical movement of the cylinder 31 and the like is performed. The operating part is prevented from reaching a position where the thermal load due to radiation is not applied, which is 1.5 m or more away from the inner wall of the furnace. Discharge position 2 before waste input port 20
8, a pallet carry-in port 39 is provided on the upper surface of the rectangular tube casing 38, and a carry-in gate 40 is provided in the pallet carry-in port 39. The carry-in gate 40 is provided in the longitudinal direction of the upper surface of the rectangular tube casing 38. It is opened and closed by driving the cylinder 41.

Next, a method of charging miscellaneous solid waste by the charging device 25 having the above-described configuration will be described. First, a miscellaneous solid waste (simulated waste) such as iron or concrete is placed on a box-shaped pallet 27 in a pretreatment chamber (not shown). ) Is prepared by putting a 200-liter drum containing and sealing and waste in a loose state.
Next, the box-shaped pallet 27 is hung on the pallet hanging member 37 of the traversing pallet handling device 29, and the hoist 3
6 was driven and lifted and run on the rail 35, and stopped above the pallet carry-in port 39 on the upper surface of the rectangular cylindrical casing 38. And, the heat insulation gate 21 of the waste input port 20,
With the seal gate 22 closed, the pallet loading port 39
After opening the carry-in gate 40 by driving the cylinder 41, the hoist 36 is driven to suspend the box-shaped pallet 27 at the delivery position 28 just before the waste inlet 20,
It was aligned with a groove (not shown) on the floor. Next, after closing the carry-in gate 40 of the pallet carry-in port 39 by the reverse drive of the cylinder 41, the drive device 34 such as a gear motor with brake is driven to move the pallet carrier 32 forward on the rail 33, and the fork 30 is moved to the box. The pallet carrier 32 was temporarily stopped at a position where the pallet was passed through the fork through hole 26 of the mold pallet 27. Next, the fork 30 is turned upward by driving the cylinder 31, and the box-shaped pallet 2
7 was lifted off a groove (not shown) on the floor at the delivery position 28, and at the same time, the heat-insulating gate 21 and the seal gate 22 of the waste inlet 20 were lifted up and opened. Then, the pallet carrier 32 was again moved forward, and the box-shaped pallet 27 supported by the fork 30 was sent out to the center of the furnace and stopped. Next, fork 30 is connected to cylinder 3
After the lower surface of the box-shaped pallet 27 is brought into contact with the inclined bottom 12 by the reverse drive of
2 is gradually retracted, and the fork 30 is
, And the entire lower surface of the box-shaped pallet 27 was gently placed on the inclined furnace bottom 12. As a result, the impact of the inclined bottom 12 on the refractory was suppressed, and damage to the refractory was prevented. After the fork 30 receded from the waste inlet 20, the heat-insulating gate 21 and the seal gate 22 were pulled down and closed. When the box-shaped pallet 27 was put into the furnace, the box-shaped pallet 27 was partially burned, but the state was maintained until it was placed on the inclined furnace bottom while holding the contents. In addition, since the time during which the fork 30 is exposed to the high-temperature furnace is short, the fork 30 is not burned, and the cylinder 31 and the rotating part for lowering the fork 30 are located at positions where heat load due to radiation from the furnace inner wall is not applied. A normal temperature state could be maintained.

The miscellaneous solid waste contained in the 200-liter drum in the box-shaped pallet 27 put into the furnace as described above is supplied to the plasma torch (1.5 MW) 1 on the furnace body 3.
6, the melting is completed, and once the melting is completed, the plasma is once extinguished. Similarly, the second and third box-shaped pallets 27 are sequentially charged and melted. An in-furnace weld pool was formed. Molten metal M
By shortening the screw jack 8 and tilting the lower furnace body 4, the lower furnace body 4 is tilted integrally with the lower furnace body 4 by being inserted and set into the hood shell 15 from the melt discharge port 13 in advance. Was discharged. Then, the lower furnace body 4 was tilted to the maximum and the entire amount of the molten metal was discharged. After the molten metal was received in the melt receiving container 14, the screw jack 8 was extended to return the lower furnace body 4 to the original horizontal state.

[0012]

As can be understood from the above description, in the method for charging miscellaneous solid waste according to the present invention, a box-shaped pallet containing miscellaneous solid waste in a container or waste in a loose state is formed. -Lift the fork with the fork passed through the through hole and put it into the furnace through the waste inlet, then retract it while adjusting the swing angle of the fork, and slowly put the box-shaped pallet on the inclined furnace bottom. Since it is placed, the impact on the refractory at the inclined furnace bottom can be suppressed, and damage to the refractory can be prevented. In addition, box-shaped palle
To retract the fork while leaving the
Thus, it is only necessary to put the furnace into the furnace from one system, and the furnace auxiliary equipment can be simplified and downsized. Further, when the box-shaped pallet is put into the furnace, the box-shaped pallet partially burns, but this state can be maintained until it is placed on the inclined furnace bottom while holding the contents.
Further, since the fork is exposed to the high-temperature furnace for a short time, the fork does not burn, and the fork is raised and lowered.
And the rotating part is at a position where a heat load due to radiation from the furnace inner wall is not applied, so that it can be maintained at a substantially normal temperature state. Further, by providing a heat shielding plate near the fork penetrating portion on the insertion side of the box-shaped pallet, a heat load due to radiation can be suppressed, and the temperature can be maintained substantially at room temperature. In addition, a box-shaped pallet or miscellaneous solid waste can be pushed in by the heat shielding plate.

Further, according to the apparatus for charging miscellaneous solid waste according to the present invention, the above-described method for dispensing miscellaneous solid waste having an excellent effect can be carried out accurately and efficiently. The volume reduction process can be streamlined.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a melting furnace provided with an apparatus for charging miscellaneous solid waste according to the present invention.

[Explanation of symbols]

 2 Furnace Body 3 Upper Furnace Body 4 Lower Furnace Body 12 Inclined Furnace 20 Waste Inlet 21 Heat Insulation Gate 22 Seal Gate 25 Injection Device 26 Fork Through Hole 27 Box Pallet 28 Delivery Position 29 Horizontal Pallet Handling Device 30 Fork 31 Cylinder 32 Pallet transport cart 33 Rail 34 Drive unit

(72) Inventor Noboru Yamaguchi 2-6-5 Minamisuna, Koto-ku, Tokyo Kawasaki Heavy Industries, Ltd. Tokyo Design Office (72) Inventor Akihiko Hayashi 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel (72) Inventor Toshiya Sato 2-3-2 Uchisaiwai-cho, Chiyoda-ku, Tokyo Kawasaki Steel Corporation (56) References JP-A-8-20403 (JP, A) JP-A-8-151095 (JP) , A) Japanese Utility Model Hei 7-9725 (JP, U) Japanese Patent Publication Hei 8-3557 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23G 5/44 ZAB F23G 5/00 115 G21G 9/32 B65F 1/12 103 B65D 88/12 B65D 19/34

Claims (3)

(57) [Claims] 1. A box-shaped pallet previously contains miscellaneous solid waste in a container and waste in a loose state, and the box-shaped pallet is suspended at a delivery position before a waste inlet of a furnace. The fork is lifted by passing the fork through the fork through hole provided in the mold pallet, then the waste inlet is opened, the box-shaped pallet is put into the furnace, and then the fork is retracted while adjusting the swing angle of the fork. And slowly place the box-shaped pallet on the inclined furnace bottom.
A method for charging miscellaneous solid waste in a melting furnace, wherein the work is retracted to its original position . 2. The method according to claim 1, wherein the main material of the box-shaped pallet is a combustible material such as wood or paper. How to throw. 3. A box-shaped pallet provided with a fork through-hole, a pallet handling device for hanging the box-shaped pallet down to a delivery position in front of a waste input port of a furnace, and a delivery in front of a waste input port. The base end of the fork passing through the fork introduction hole of the box-shaped pallet suspended at the position is pivoted to the rear, and the box-shaped pallet is placed on the inclined furnace bottom at the front. And a driving device for moving the pallet carrier on the rails. A device for charging miscellaneous solid waste in a melting furnace.