JPS6224694B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an electric melting furnace that continuously melts incineration residue of municipal waste, sewage sludge, industrial waste, etc., and ash collected in a dust collector. It is about improvement.

(Prior Art) Generally, most of the incinerated ash of municipal waste and the ash collected by dust collectors are disposed of in landfills. However, it is becoming increasingly difficult to secure landfill sites year by year, and there is a widespread demand for reducing the volume of rice husks.

On the other hand, a so-called waste incineration ash melting furnace has been developed to reduce the volume of municipal waste incineration ash. However, various technical problems remain in existing waste incineration ash melting furnaces, and stable operation has not yet been achieved. For example, clinker is generated at the molten ash outlet, making it difficult to take out the molten ash continuously, or it is extremely difficult to continuously and safely melt the incinerated ash, making it impossible to reduce the volume sufficiently. There was a problem.

Therefore, the present applicant has developed an electric rice husk melting furnace to solve the above-mentioned problems with conventional waste melting furnaces, and has previously filed an application for the same. (Jitsugan No. 58-15871).

That is, the electric husk melting furnace, as shown in FIG. Overflow weir 28 and unmelted material obstruction plate 29
An electrode 31 is disposed on the furnace lid 26 so as to be able to move up and down, and a support pedestal 32 and a tilting device 33 that support the furnace body 25 so as to be tiltable towards the slag opening 30 side. There is. In addition, in the figure, 3
4 is a molten metal, 35 is a molten material, 36 is an unmelted material, 37 is a drain, 38 is a drain cover, 39 is a raw material input chute, and 40 is a dust collection duct.

The rice husks charged into the furnace from the raw material inputting chute 39 are sequentially melted by the electric resistance heat from the electrode 31, and molten metal 3 is deposited on the hearth surface.
4. The molten material 35 and the unmelted material 36 are formed in layers. When the depth of the molten material 35 exceeds a certain value, the molten material 35 passes through the lower part of the unmelted material obstruction plate 29, sequentially overflows from the overflow weir 28, and flows down the drain trough 37. Note that since the obstruction plate 29 is provided, the unmelted material 36 will not overflow together with the molten material 35.

On the other hand, as the furnace operating time elapses, the molten metal 34
As the metal molten layer accumulates and becomes deeper, the molten layer becomes shallower, and the immersion depth of the electrode 31 immersed in the molten layer becomes shallower. As a result, the power load decreases and the melting capacity gradually decreases, making it impossible to maintain a highly efficient melting state.

Therefore, it is necessary to periodically discharge the metal container 34 to the outside. When discharging, as shown in FIG. 6, the electrode 31 is pulled upward, and the tilting device 33 is operated to tilt the furnace body 25 about the support shaft 41 of the support frame 32, thereby discharging the molten metal 34. The slag is discharged from the furnace through a slag port 30.

However, in the electric melting furnace, the molten metal 3
4, the molten metal 35 inevitably comes out from the slag outlet 30 at the beginning of the tilting of the furnace body 25, and after the molten metal 35 is blocked by the obstruction plate 29, the molten metal 34 is discharged. It will be discharged. As a result, when the furnace body 25 is returned to its original position after the molten metal 34 has been discharged, the molten layer becomes shallower due to the molten material 35 being discharged at the beginning of the tilting, and the electrode 31 is again removed. When the electrode 31 is lowered and energized, the depth of immersion of the electrode 31 into the molten material layer becomes shallow, the power load is lower than before the molten metal 34 is discharged, and there is a problem that the melting efficiency deteriorates.

Further, in order to reduce the total amount of molten material 35 discharged when the furnace body 25 is tilted, the tilting speed of the furnace body 25 may be increased, but in this case, the amount of molten material 35 discharged temporarily increases. , melt 35, metal melt 3
There is also the problem that the cooling and solidifying device No. 4 becomes larger.

(Problems to be Solved by the Invention) The present invention was devised to solve the above-mentioned problems, and its purpose is to provide a chaff that can reliably discharge only a certain amount of molten metal. to provide electric melting furnaces.

(Means for Solving the Problems) The present invention provides an electric melting furnace that continuously melts chaff of municipal waste, etc., and that is equipped with a melt outlet on the side wall of the furnace body. A separate discharge port for the molten metal is formed above the slag outlet on the side wall of the furnace body, and a metal discharge device capable of opening and closing the discharge port is provided, and the furnace body is moved toward the discharge port side by a tilting device. The basic structure is that it is supported so that it can be tilted freely.

(Function) The husks of municipal waste, etc. thrown into the furnace are sequentially melted by the electrical resistance heat from the electrodes, the metals in the husks settle into the hearth, and the molten material overflows from the slag outlet. It is dregs.

On the other hand, since the amount of settled metal melt increases over time, it is necessary to periodically discharge it. When discharging, the furnace body is tilted toward the discharge port using a tilting device, and when the molten metal reaches a height above the discharge port, the metal discharge device is activated to open the discharge port and the molten metal is discharged to the outside. Discharge. When the discharge of the molten metal is finished, the discharge port is closed by the metal discharge device, and the furnace body is returned to its original position. Note that since the metal discharge device can adjust the opening degree of the discharge port, the discharge amount of the molten metal can be adjusted.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a schematic longitudinal sectional view of an electric husk melting furnace according to the present invention, in which 1 is the furnace body, 2 is a slag outlet, 3 is a discharge port, 4 is a metal discharge device, 5 is a tilting device, 6 is metal melt, 7 is melt (slag), 8
is an unmelted substance.

A slag outlet 2 is formed in the side wall of the furnace body 1, and this is formed into an overflow weir 9 formed below the side wall of the furnace body 1 and a wall shape that hangs from above the inside of the furnace of the overflow weir 9. It consists of an unmelted material obstruction plate 10. The height of the overflow weir 9 is appropriately selected depending on the throughput of the electric melting furnace so as to obtain the most efficient pool depth. Further, the overflow weir 9 is provided at a position where it can always maintain a temperature at which the melt 7 can easily overflow.
Furthermore, the unmelted material obstruction plate 10 is provided with its lower end position slightly lower than the molten metal overflow weir 9 and slightly immersed in the molten metal puddle, thereby blocking the outflow of the unmelted material 8 and , only the molten slag is allowed to pass through and overflow from the overflow weir 9.

Slag outlet 2 on the side wall of the furnace body opposite to the slag outlet 2
A discharge port 3 for the molten metal 6 is located above the
is formed.

Further, a discharge port 3 is provided on the outer peripheral side of the side wall of the discharge port 3.
A metal discharge device 4 is provided which can be opened and closed.
That is, as shown in FIGS. 2 and 3, the metal discharge device 4 includes a fixed gate 12 made of special refractory material and having an opening 11 having the same diameter as the discharge port 3, and a fixed gate 12 made of the same material and having an opening 11 having the same diameter as the discharge port 3. A movable gate 14 having an opening 13 with the same diameter as 11, and a movable gate 1
4 and a driving device 15 such as a cylinder. The fixed gate 12 is fixed to the side wall of the furnace body 1 by an appropriate method so that its opening 11 coincides with the discharge port 3, and the movable gate 14
is provided so as to be able to slide on the fixed gate 12. Thus, the movable gate 14 is driven by the drive device 15.
opening 1 of both gates 12 and 14.
The discharge port 3 can be opened and closed by matching or mismatching the numbers 1 and 13. In addition, metal discharge device 4
Since the opening area of the discharge port 3 can be varied by appropriately adjusting the moving distance of the movable gate 14, the discharge amount of the molten metal 6 can be regulated.

The discharge port 3 is desirably located above the side wall facing the slag discharge port 2. However, if it is not provided on the side wall facing the slag outlet 2 due to location, etc., it may be installed on any of the other three side walls excluding the side wall where the slag outlet 2 is located if the furnace body is square. It is possible. In addition, when the furnace body is nearly circular, the side wall facing the slag outlet 2,
It is possible to provide it anywhere within a range of approximately 180° in terms of central angle.

The furnace body 1 is supported by a support frame 16 and a tilting device 5 such as a cylinder so that the discharge port 3 side can move vertically, and when the tilting device 5 operates, the discharge port 3 moves vertically about a support shaft 17. .

In FIG. 1, 18 is a drain provided below the overflow weir 9, 19 is a plurality of electrodes disposed on the upper wall of the furnace body 1 so as to be able to be raised and lowered and taken out;
0 is a raw material inputting chute that is arranged to be freely put in and taken out of the furnace, 21 is a dust collection duct that is arranged so that it can be taken in and taken out of the furnace, 22 is a drain cover made of a heat insulating material, 2
3 is a metal discharge gutter.

Next, the effect will be explained.

The husks of municipal waste, etc. that are uniformly thrown between the electrodes 19 from the raw material input chute 20 are
The metal is sequentially melted by the electric resistance heat from the metal, and the molten metal 6, the molten metal 7, and the unmelted metal 8 are formed in layers on the hearth surface, respectively. When the depth of the molten material 7 reaches a certain value or more, the molten material 7 passes through the lower part of the obstruction plate 10 slightly immersed in the molten pool, sequentially overflows from the overflow weir 9, and flows down from the drain trough 18. Note that the unmelted material 8 is prevented from moving by the obstruction plate 10, and does not overflow from the slag outlet 2 together with the melted material 7.

On the other hand, as the metal molten material 6 accumulates in the hearth over time, it is necessary to discharge this to the outside. When discharging, first, the unmelted material 8 in the furnace body 1 is completely melted, and then the electrode 19 is pulled up to the extent that it does not hit the molten metal layer, and the tilting device 5 is activated to move the furnace body 1. The support frame 16 is tilted toward the discharge port 3 side as shown in FIG. 4 using the support shaft 17 as a fulcrum. Next, when the metal molten material 6 reaches a height higher than the discharge port 3, the movable gate 14 of the metal discharge device 4 is moved to open the discharge port 3. At this time, since the discharge port 3 is located in the molten metal layer, only the molten metal 6 is discharged from the discharge port 3. Then, when a certain amount of the molten metal 6 has been discharged, the movable gate 14 is moved to close the discharge port 3, and the furnace body 1 is returned to its original position. Since the molten material 7 is not discharged when the metal molten material 6 is discharged, the depth of the molten material 7 does not change if the furnace body 1 is returned to its original position. As a result, melting can be continued under almost the same load conditions as before discharging the molten metal.

Note that the configuration of the furnace body 1 is not limited to the above embodiment; the furnace body is divided into upper and lower parts, the two are connected by a heat-resistant flexible plate, and only the lower part of the furnace body is tilted by a tilting device. You may also do this.

Further, the configuration of the metal discharge device 4 is not limited to the above embodiment, and any configuration can be used as long as it is provided at a higher position than the slag outlet 2 and the outlet 3 can be opened and closed as appropriate.

(Effects of the Invention) As described above, according to the present invention, the following excellent effects can be achieved.

(1) A discharge port for the molten metal is formed above the slag port, and a metal discharge device that can open and close the discharge port is provided, and the furnace body can be tilted toward the discharge port by a tilting device. Because of this structure, only the molten metal can be discharged when discharging the molten metal. As a result, even when the furnace body is returned to the horizontal state after discharging the molten metal, there is no change in the depth of the molten metal, and the furnace can be operated under the same load as before tilting, making it possible to increase melting efficiency.

(2) Since the metal discharge device is installed above the slag outlet, the metal discharge device will not be corroded by molten material. Even if the metal discharge device is eroded or the discharge port is blocked by the molten material or metal, it can be repaired from outside the furnace during operation, which is very convenient.

(3) Since the metal discharge device can adjust the opening degree of the discharge port arbitrarily, the discharge amount of molten metal can be kept constant. As a result, the capacity of the cooling and solidification equipment may be small, and manufacturing costs can be reduced.

[Brief explanation of the drawing]

Fig. 1 is a schematic longitudinal sectional view of the electric husk melting furnace according to the present invention, Fig. 2 is a schematic front view of the metal discharging device, Fig. 3 is a schematic plan view, and Fig. 4 is a schematic longitudinal sectional view of the electric husk melting furnace according to the present invention. FIG. 5 is a schematic vertical cross-sectional view of a conventional electric husk melting furnace, and FIG. 6 is a schematic vertical cross-sectional view of the furnace body in a tilted state. 1 is a furnace main body, 2 is a slag outlet, 3 is a discharge port, 4 is a metal discharge device, and 5 is a tilting device.

Claims (1)

[Scope of Claims] 1. In an electric rice husk melting furnace that continuously melts rice husks such as municipal waste and is equipped with a molten waste outlet 2 on the side wall of the furnace body 1, A discharge port 3 for the molten metal is separately formed at a position above the slag discharge port 2 on the side wall, and a metal discharge device 4 for opening and closing the discharge port 3 is provided, and the furnace body 1 is discharged by a tilting device 5. An electric husk melting furnace characterized by being supported so as to be tiltable toward the outlet 3 side. 2. The electric husk melting furnace according to claim 1, wherein the metal discharge device 4 is configured so that the opening degree of the discharge port 3 can be adjusted.