JPH0650800Y2 - Incinerator - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention is directed to reducing the volume of combustible radioactive waste such as polyethylene, waste, and paper generated in nuclear power plants, etc. in a floor combustion type incinerator. The present invention relates to an incinerator having an incineration residue discharging device for automatically discharging the incinerated residue.

(Prior Art) Conventionally, polyethylene generated in nuclear power plants,
Combustible radioactive waste such as waste and paper is incinerated and reduced in volume in a self-combusting vertical cylinder incinerator, but since this self-combusting vertical cylinder incinerator is large, it burns too much air. However, there is a problem that the whole apparatus becomes large and complicated and the cost becomes high. Therefore, there has been a demand for the development of a floor-burning type incinerator that has a small size, a simple structure, and low cost. The combustion method of this floor-burning type incinerator is divided into two stages. First, the combustible material is self-combusted in a suppressed air atmosphere, that is, at an air ratio smaller than the theoretical air ratio, and the combustible material is converted into charcoal (this (It is called "gasification combustion"), and then combustible materials are combusted under an air ratio in excess of the theoretical air ratio to form an ash state (this is called "burning combustion"). This floor-burning type incinerator is suitable for putting in combustible materials all at once and treating them easily.

(Problems to be solved by the invention) However, in this conventional floor-burning type incinerator, radioactive combustibles are charged to the hearth surface through a charging / discharging port provided on the same plane as the hearth surface. Since the incineration ash, that is, the residue is manually taken out from the charging / discharging port and the working environment is not good, for example, when burning combustible radioactive waste, automatic charging and discharging is desired.

When a combustible material containing a synthetic resin such as polyethylene is gasified and burnt, the synthetic resin in the combustible material deposited on the hearth melts and flows out, opening and closing the lid that opens and closes the discharge port. There may be a problem in that the synthetic resin melted on the part adheres to the part and the cover part is closed and cannot be opened.

An object of the present invention is to solve the above-mentioned inconvenience and to provide an incinerator having an incineration residue discharging device capable of automatically discharging an incineration residue.

(Means for Solving Problems) An incinerator for combustible radioactive waste according to the present invention has an inlet for incineration objects, an outlet for incineration residues, and a hearth surface. Is a floor combustion type incinerator that statically burns combustible radioactive waste by providing the discharge port on the side surface of the incinerator, the furnace floor surface lower than the discharge port, and further discharging the incineration residue. A scraper, and a shaft attached to the scraper via a parallel link mechanism that allows the scraper to move up and down and has a locking and releasing mechanism,
An incineration residue discharge device including a drive system for moving the shaft laterally is provided on a side surface of the incineration device so as to face the discharge port and substantially on the same plane, and further, the discharge port on the hearth surface. It is characterized in that a taper surface is provided at an end portion connected to and an end portion connected to the incineration residue discharging device.

(Function) According to the present invention, the synthetic resin such as polyethylene contained in the incineration material is melted and accumulated on the hearth surface by lowering the hearth surface below the discharge port of the incineration residue. Does not cause the blockage of the discharge port or the cover member that opens and closes the discharge port.

Further, the vertically movable scraper and the shaft and drive system for laterally moving the scraper enable the scraper to effectively trace the hearth surface, so that the incineration residue accumulated on the hearth surface can be pushed out to the discharge port. .

(Example) An example of the incinerator of the present invention will be described in detail.

FIG. 1 shows the entire incinerator 1 of the present invention. Two
Indicates an incinerator for gasifying and burning burnable radioactive waste, and 3 indicates an incineration residue discharge device provided in the incinerator.

First, the incinerator 2 will be described. This incinerator 2 is called a floor combustion type, and the inside of the incinerator 2 is covered with a refractory material 4 made of, for example, silicon carbide, and a steel frame member 5 is formed on the outside thereof. Has been done. In the upper part of the incinerator 2, there are provided an input port 6 for inputting combustible radioactive wastes such as polyethylene, waste cloth and paper, and a gas discharge port 7 for discharging gas. This gas outlet 7
Is connected to a device (not shown) for inhaling and purifying exhaust gas. In addition, an insertion port 8 into which an incineration residue discharging device 3 for discharging incineration ash and an incineration residue discharging port 9 are respectively provided on any one of a pair of opposing two side walls of the incinerator 2. On the frame member 5 above the incineration residue discharge port 9, a lid member 10 for opening and closing the incineration residue discharge port 9 is provided.
The lid member 10 is connected to the frame member 5 via a lever 11 which is pivotally supported, and the lid member 10 can be opened and closed as indicated by an arrow A as required. Further, as shown in FIG. 2, the pair of other two side walls of the incinerator 2 facing each other are provided with a peep hole 12 and a peep hole 12.
Individual burner insertion openings 13 and 14 are provided, respectively. Further, the hearth surface 15 of the incinerator 2 is recessed, and a tapered surface having a gentle slope is provided at the end portion connected to the insertion port 8 and the incineration residue discharge port 9 provided on each side wall thereof. Air supply ports 16 for supplying air when combustible radioactive wastes are burned are provided on the side wall of the recessed hearth surface 15 in a row or at regular intervals.

Next, the incineration residue discharging device 3 inserted into the insertion port 8 in FIG. 1 will be described based on FIGS. 3 and 4.
Reference numeral 17 denotes a scraper for scraping out incineration residues, 18 denotes a parallel link mechanism connected to the scraper 17, and 19 denotes a hollow shaft connected to the parallel link mechanism 18 via a flange 20.

The scraper 17 is composed of a heat insulating material 21 having a small specific gravity and softness, and a metallic rectangular plate 22 to which the heat insulating material 21 is bonded. The lower portion of the heat insulating material 21 slides along the concave hearth surface 15 having a tapered surface at a part thereof, and therefore a tapered surface is provided at a part thereof. Of the metallic rectangular plate 22,
For example, four projections 23 (; 23a, 23b, 23c, 23d) are provided on the surface opposite to the surface bonded to the heat insulating material 21 and project from the surface and are vertically and horizontally separated by a predetermined distance. The parallel link mechanism 18 is rotatably connected to the four protrusions 23 so that the scraper 17 can move up and down while maintaining its horizontal position.

The parallel link mechanism 18 will be described in detail below. The four link members 2 are attached to the four protrusions 23 (; 23a, 23b, 23c, 23d).
4 (; 24a, 24b, 24c, 24d), one end of each of which is pivotally supported, and the other end of the link member 24 projects from the flange 20 and is fixed to the flange 20 vertically and horizontally similarly to the projection 23. The projections 25 (; 25a, 25b, 25c, 25d) arranged at intervals are pivotally supported. An L-shaped arm 26 is rotatably attached to at least one of rotation shafts on which the projection 25 and the link member 24 are pivotally mounted. For example, in FIGS. 3 and 4, a link member 24d is pivotally supported by a protrusion 25b, and an L-shaped arm 26 is pivotally attached to the pivot shaft 27 from the outside. On the end portion side of the L-shaped arm 26 extending substantially parallel to the link member 24b, a locking pin 28 protruding outward from the link member 24b (direction protruding perpendicularly from the plane of the drawing).
Is provided with a step portion 29 that comes into contact with the other link member.
A long groove 30 is provided on the end portion side that extends in a direction substantially perpendicular to 24, and in this long groove 30, the hollow shaft 19 of the solid shaft 31 concentric with the hollow shaft 19 and extending inward. A pin 32 protruding toward the L-shaped arm 26 is inserted from the end side that has come out of the pin 32, and the pin 32 can slide in the long groove 30.

By the way, the end of the solid shaft 31 opposite to the side where the pin 32 is provided is connected to the air cylinder 33 as shown in FIG. Further, in the hollow shaft 19 that houses the solid shaft 31,
The female screw member 34 is fixed, and this female screw member 34 is
The feed screw 35 extends parallel to the axis of the solid shaft 19 and on substantially the same plane. The feed screw 35 has one end connected to a motor 36 via a chain or a belt, and the other end pivotally supported by a partition wall 37, so that the feed screw 35 is rotated by the rotation of the motor 36. It can rotate about its axis. When the feed screw 35 is further rotated by the motor 36, the female screw member 34 threadedly engaged with the feed screw 35 moves horizontally in cooperation with the feed screw 35, and as the female screw member 34 moves, the female screw member 34 moves. The fixed hollow shaft 19 moves horizontally, and the horizontal movement of the solid shaft 19 causes the scraper 17 connected thereto to move horizontally. Because of this, the scraper
In order to limit the moving range of 17 to a distance sufficient to discharge the incineration residue, the moving range of the female screw member 34 on the feed screw 35 is limited, for example, by providing the partition wall 37 or the stopper 44 on the feed screw 35. do it.

The hollow shaft 19 is fitted to the sleeves 39 and 40 fixed to the side wall 38 via the seal members 41 and 42, and therefore,
The gas in the furnace does not enter the incineration residue discharging device 3. Further, a side wall 38 near the scraper 17 and the parallel link mechanism 18 is provided with an openable / closable purge air supply port 43,
Cooling air can be introduced into the furnace if desired.

The incinerator 2 provided with the incineration residue discharging device 3 as described above
The operation of will be described below.

First, the combustible radioactive waste to be burned is charged from the charging port 6 of the incinerator 2, and the combustible radioactive waste is deposited on the hearth surface 15. In order to burn this radioactive combustible material statically, the temperature inside the furnace and the temperature of the combustible radioactive waste are raised by the burners inserted from the burner insertion ports 13 and 14. After raising to an appropriate temperature, for example, the gasification temperature of 500 ° C., the heating by the burner is stopped, the combustible radioactive waste is caused to self-combust, and the synthetic resin film such as polyethylene of the combustible radioactive waste is melted to release gas, In addition, waste cloth and paper are burnt on the surface so that the amount of combustion air is adjusted to a charcoal state. Next, while supplying excess air to the combustible material in the charcoal state through the air supply port 16, the combustible material is further burned to be in an ash state. The combustion temperature in this case is about 700
The temperature is ℃, and the amount of ash accumulated at the end of combustion is only a few centimeters from the hearth of the furnace, even if combustible radioactive waste is packed in the furnace.

In order to take out the incineration residue, that is, the incineration ash accumulated on the dented furnace floor surface 15 from the incineration residue discharge port 9, it is necessary to move the scraper 17 toward the incineration residue discharge port 9 to push out the incineration ash. Therefore, the incineration residue discharging device 3 is operated. First, the engaging means of the link member 24 composed of the solid shaft 31, the air cylinder 33 and the L-shaped arm 26 is operated to push the solid shaft 31 out by operating the air cylinder 33, thereby engaging the L-shaped arm 26. Move from the stop position (solid line) to the release position (virtual line). Then, the scraper 17 descends due to its own weight and comes into contact with the hearth surface 15. Next, the motor 36 is operated to rotate the feed screw 35 forward through the belt or the chain. By the rotation of the feed screw 35, the female screw member 34 screwed into the feed screw 41 is fed and moved toward the incineration ash discharge port 9. By this feed movement, the hollow shaft 19 to which the female screw member 34 is fixed is fed and moved toward the incineration residue discharge port 9, so that the scraper 17 is housed in the hollow shaft 19 and is solid shaft 31.
And it is moved toward the incineration residue discharge port 9 together with the air cylinder 33 connected to the solid shaft 19. During this movement, the scraper 17 moves while sliding on the hearth surface 15 and pushes out the incineration residue accumulated on the hearth surface 15. Of course, in this case, the lid member 10 is open. The forward rotation of the feed screw 35 causes the female screw member 34 to move to the end of the feed screw 35 and stop. Since the position of the scraper 17 at the time of this stop projects from the incineration residue discharge port 9, the incineration residue can be completely discharged. By the way, the scraper 17 may be moved to at least the incineration residue discharge port 9 and stopped. Therefore, the feed screw 35 may be partitioned at an appropriate position, or when the position is reached, the motor 36 is stopped and the feed screw 35 is stopped. It is also possible to stop the rotation (see the dotted line position of the scraper 17 in FIG. 1).

Next, the pressure of the air cylinder 33 is reduced to reduce the pressure of the air cylinder 33.
To reduce the amount of protrusion of the solid shaft 31 from the solid shaft 19 and to project from the solid shaft 31 to be inserted into the long groove 30 of the L-shaped arm 26. After moving (returning movement), the L-shaped arm 26 is rotated about the rotary shaft 27 so that the step portion 29 of the L-shaped arm 26 comes into contact with the locking pin 28, and pushes up the locking pin 28 to pull up the link member 24 and the scraper 17. To the position as shown by the solid line in FIG. Next, the motor 36 is rotated in the reverse direction, and the feed screw 35 connected to the motor 36 via a chain or a belt is rotated in the reverse direction,
Move back the female screw member 34 screwed to the feed screw 35,
Hollow shaft 19 fixed to female screw member 34, and this hollow shaft
Scraper 17 connected to 19 via parallel link mechanism 18
Move back. This return movement stops the drive of the motor 36 when the scraper 17 reaches the end of the hearth surface 15, that is, the position drawn by the solid line in FIG. 1, and the rotation of the feed screw 35 associated therewith, The movement is ended by stopping the movement of the hollow shaft 19 and the scraper 17. By repeating the above cycle many times, the incineration residue accumulated on the hearth surface 15 can be completely discharged.

By the way, when there are many incineration residues accumulated on the hearth surface 15 and the incineration residues, that is, the incineration ash can be discharged even at the position where the scraper 17 is raised, it is effective to perform the partial discharge of the incineration ash. For example, first, when the scraper 17 is in the raised position, the hollow shaft 19 is fed and moved so that the incineration residue is discharged by the scraper 17, and then the locking of the scraper 17 is released near the incineration residue discharge port 9, and the position thereof is released. The incineration ash from the incineration residue discharge port 9 is discharged. Then, the scraper 17 is sequentially moved to a position away from the incineration residue discharge port 9, and this work is repeated. Therefore, the incineration ash is gradually discharged from the side close to the incineration residue discharge port 9.

Since the temperature in the incinerator is high during incineration, it is necessary to supply purge air from the purge air supply port 43 to cool the periphery of the metallic parallel link mechanism 18. In this case, since the gas is constantly discharged from the gas discharge port 7 in the incinerator, the pressure is negative and the gas in the incinerator does not blow out from the purge air supply port 43 in reverse.

The embodiment of the incinerator of the present invention has been described above.
The present invention is not limited to this example, and it is obvious that various modifications and changes can be made. For example, by using an air cylinder as a step motor, the vertical position of the scraper 11 can be set in any number of stages, whereby the incineration ash can be gradually discharged from above in a constant step.

Further, the number of link members 24 constituting the parallel link mechanism 18 may be at least one or more, and may be two, three or more. In this case, the projections 23 and 25 need to have a number corresponding to the link member 24.

(Effects of the Invention) The present invention is equipped with a mechanism for mechanically discharging the incineration residue in the incinerator, thereby rationalizing the incineration residue discharging work that was conventionally performed by manpower, reducing the exposure of workers and reducing the environment. Can be improved.

[Brief description of drawings]

Fig. 1 is a sectional view showing a part of an incinerator in which an incineration residue discharging device is incorporated, Fig. 2 is a sectional view taken along the line I-I in Fig. 1, and Fig. 3 is a lifting mechanism of the incineration residue discharging device. FIG. 4 is a partial detailed view showing the same, and FIG. 4 is a partial detailed view showing the state of the incineration residue discharging device at the release position. DESCRIPTION OF SYMBOLS 1 ... Incineration apparatus, 2 ... Incinerator 3 ... Incineration residue discharge apparatus, 4 ... Refractory material 5 ... Frame member, 6 ... Input port 7 ... Gas discharge port, 8 ... Insertion port 9 ... Incineration residue discharge port, 10 ... Lid member 11 ... Lever, 12 ... Peep hole 13 ... Burner insertion port, 14 ... Burner insertion port 15 ... Hearth surface, 16 ... Air supply port 17 ... Scraper, 18 ... Parallel link mechanism 19 ... Hollow shaft, 20 ... Flange 21 ... Insulation Material 22 ... Rectangular plate 23 ... Projection, 24 ... Link member 25 ... Projection, 26 ... L-shaped arm 27 ... Rotating shaft, 28 ... Locking pin 29 ... Step, 30 ... Long groove 31 ... Solid shaft, 32 ... Pin 33 ... Air cylinder, 34 ... Female screw member 35 ... Feed screw, 36 ... Motor 37 ... Partition wall, 38 ... Side wall 39 ... Sleeve, 40 ... Sleeve 41 ... Seal member, 42 ... Seal member 43 ... Purge air supply port, 44 ... Stopper

Claims (2)

[Scope of utility model registration request] 1. A floor-burning type incinerator having an inlet for incineration objects, an outlet for incineration residues, and a hearth surface, in which combustible radioactive waste is statically burnt on the hearth surface. Where the discharge port is provided on the side surface of the incinerator, the hearth surface is provided lower than the discharge port, and a scraper for discharging the incineration residue, and a locking and releasing mechanism that enables the scraper to move up and down. An incineration residue discharging device comprising a shaft attached to the scraper via a parallel link mechanism having a drive system for laterally moving the shaft, and a side surface of the incineration device facing the discharge port and substantially An incinerator characterized by being provided on the same plane, and further provided with a tapered surface at an end connected to the discharge port of the hearth surface and an end connected to the incineration residue discharge device. 2. The parallel link mechanism rotates at least one link member having both ends pivotally supported by the scraper and the shaft, and engages with at least one of the link members to rotate the link member. The incinerator according to claim 1, wherein the utility model registration comprises a lifting lever.