JP3854451B2 - Emergency shut-off device for molten metal outlet - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention melts incineration residues discharged from incinerators such as municipal waste and industrial waste and melted materials such as fly ash, and at the same time, provides molten metal collected on the furnace wall with molten metal collected at the furnace bottom. Used in melting furnaces that are extracted from the tap (tap hole) and crushed with cooling water, ensuring the amount of water required for pulverizing and cooling molten metal due to unforeseen circumstances during molten metal tapping. The present invention relates to an emergency shutoff device for a molten metal hot water outlet that can forcibly stop the molten metal hot water outlet when the mud filling device that automatically closes the molten metal hot water outlet cannot be used.
[0002]
[Prior art]
In recent years, in order to reduce the volume and detoxify incineration residue and fly ash (hereinafter referred to as melted material) discharged from incinerators such as municipal waste, melting and solidifying treatment methods of melted materials have attracted attention. It is used for practical use. Because the melted material can be melted and solidified, its volume can be reduced to 1/2 to 1/3, and the elution of hazardous substances such as heavy metals, reuse of molten slag, and final landfill site This is because it is possible to prolong life.
[0003]
Thus, in the melting and solidifying method of the melt, an electrical melting furnace such as a plasma melting furnace, an arc melting furnace, or an electric resistance furnace is used, and after melting the melt with electric energy, this is performed. Using a method of solidification by water cooling or air cooling, and a combustion melting furnace such as a surface melting furnace, a swirl melting furnace, a coke bed furnace, etc., melt the material to be melted by the combustion energy of the fuel, and then solidify it by water cooling or air cooling If the power generation equipment is juxtaposed with the waste incineration facility, the former method using electric energy is used. If the power generation equipment is not juxtaposed, the latter method is used. Many methods using combustion energy are employed.
[0004]
FIG. 4 shows an example of an electric melting furnace installed in the waste incineration equipment. In FIG. 4, 20 is a melting furnace, 21 is a molten metal outlet (tap) formed on the furnace wall of the melting furnace 20. Hole), 22 is a downwardly inclined metal hot water tap provided continuously to the molten metal hot water outlet 21, 23 is a cooling water tank for storing cooling water W connected to the metal hot water tap 22, and 24 is a cooling water tank 23. A metal granulation nozzle provided to spray and cool the molten metal M from the metal tap 22 to the molten metal M falling into the cooling water tank 23, and 25 is a metal granulation nozzle 24 and a cooling water tank. A granulated water pump for supplying cooling water W to 23, 26 is a water-sealed conveyor disposed in the cooling water tank 23, 27 is excavated and removed from the mud material such as clay filled in the molten metal outlet 21 and melted. Open metal outlet 21 Together they are equipped with perforator, a mud filling device for closing the molten metal tap hole 21 is filled with a mud material clay such as molten metal tap hole 21 which is opening.
[0005]
The material to be melted supplied into the melting furnace 20 is heated to a temperature exceeding the melting point by electric energy to become a high-temperature liquid melt. Since this melt contains a lot of slag components such as metals including iron and silica in the melt, the melt slag S and the melt slag S located above due to the specific gravity difference are located below. It is separated into molten metal M located at the bottom of the furnace.
[0006]
The molten slag S continuously overflows from a molten slag outlet (not shown) provided on the furnace wall of the melting furnace 20, falls into a slag cooling water tank (not shown) filled with cooling water, and granulated slag After that, it is discharged by a water-sealed slag carry-out conveyor (not shown).
On the other hand, the molten metal M remains and accumulates on the bottom of the furnace sequentially as the operation time of the melting furnace 20 elapses, and the liquid level of the molten metal M rises and its thickness increases. When the liquid level of the molten metal M rises, various problems occur. For example, when the liquid level of the molten metal M rises and reaches the overflow level of the molten slag S, the molten metal M may be mixed with the molten slag S and discharged. In this case, the quality of the slag decreases. Problems occur.
[0007]
Therefore, in the conventional melting furnace 20, the molten metal outlet 21 provided in the lower part of the furnace wall of the melting furnace 20 is opened intermittently, and the molten metal M is extracted from the molten metal M to form a layer of the molten metal M. The thickness does not exceed a predetermined thickness.
Further, when the operation of the melting furnace 20 is stopped, in order to prevent the molten metal M and the like from being cooled and solidified in the furnace, the molten metal outlet 21 provided at the lower part of the furnace wall of the melting furnace 20 is opened. The molten metal M and the like are extracted through holes to make the inside of the melting furnace 20 empty.
[0008]
Thus, in order to extract the molten metal M accumulated at the bottom of the melting furnace 20, the mud material filled in the molten metal outlet 21 is excavated and removed by an opening machine mounted on the mud filling device 27. The molten metal outlet 21 is opened. As a result, the molten metal M accumulated in the bottom of the melting furnace 20 is discharged into the metal outlet 22 through the molten metal outlet 21.
After the discharged molten metal M flows down in the metal tap 22, falls from the metal tap 22 into the cooling water tank 23, and is granulated and cooled by the cooling water W sprayed from the metal granulating nozzle 24. Then, it is completely cooled in the cooling water tank 23 and carried out by the water-sealed conveyor 26.
On the other hand, when the extraction of the molten metal M is completed, the mud material is filled in the molten metal outlet 21 opened by the mud filling device 27, and the molten metal outlet 21 is closed.
[0009]
[Problems to be solved by the invention]
By the way, in the conventional melting furnace 20, the mud filling device 27 is filled with the mud material in the molten metal hot water outlet 21 to forcibly stop the molten metal M. In the case, there were the following problems.
That is, when a power failure occurs while the molten metal M is being tapped, the granulated water pump 25 is stopped and the cooling water W cannot be supplied, so that the temperature of the cooling water W in the cooling water tank 23 rises, causing a steam explosion. was there. However, since the mud filling device 27 can no longer be used, the hot water of the molten metal M cannot be forcibly stopped, and the molten metal M continues to fall into the cooling water tank 23, increasing the danger.
Further, there is a problem that even when the mud filling device 27 is out of order even at times other than a power failure, it is impossible to forcibly stop the molten metal M.
[0010]
The present invention has been made in view of such problems, and the purpose thereof is when the amount of water required for the granulation / cooling of the molten metal cannot be ensured due to an unexpected situation during the tapping of the molten metal or when the molten metal is melted. An object of the present invention is to provide an emergency shut-off device for a molten metal hot water outlet that can forcibly stop the molten metal hot water when a mud filling device that automatically closes the metal hot water outlet cannot be used.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the invention of claim 1 of the present invention is a melting furnace in which the molten metal accumulated in the furnace bottom is extracted from a molten metal outlet provided on the furnace wall and is granulated with cooling water. An emergency shut-off device provided on the molten metal tap outlet side, wherein the emergency shut-off device is disposed at an upper position of a metal tap that allows the molten metal discharged from the molten metal tap to flow down. A gate cover, a gate that is housed in the gate cover so as to be movable up and down, opens and closes a metal discharge path of the metal tap, an electromagnet that holds the gate in an upper position by magnetic force and opens the metal discharge path, a gate cover and a gate The drive system with a cooling material housed in between is composed of an electromagnet type metal shut-off gate. The metal discharge passage is further lowered to close the metal discharge path, and as the gate is lowered, the filler in the gate cover is discharged to the upstream position of the gate, and the discharged filler fills the gap between the gate and the metal discharge path. It is characterized by being configured to cool the molten metal in the blocked metal discharge passage while preventing the molten metal from leaking .
[0012]
The invention according to claim 2 of the present invention is such that the emergency shut-off device opens and closes the metal discharge gate of the metal tap and opens and closes the outlet side of the molten metal tap. The system is composed of cylinder-type metal shut-off gates, and the gates of the respective metal shut-off gates are configured to block the metal discharge passage and the outlet side of the molten metal outlet .
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a melting furnace 1 provided with an emergency shut-off device A according to an embodiment of the present invention. The melting furnace 1 includes a molten metal outlet 2 provided with a molten metal M accumulated at the bottom of the furnace at the lower part of the furnace wall. It is extracted from the (tap hole) and crushed with the cooling water W, and the metal shut-off gates A1 and A2 having different driving systems are provided on the outlet side of the molten metal tap 2.
[0015]
The melting furnace 1 melts incineration residues discharged from incinerators such as municipal waste and industrial waste, and to-be-melted objects such as fly ash by electric energy, and has a structure similar to that of conventionally known ones. Has been. On the furnace wall of the melting furnace 1, an object supply port (not shown) for supplying an object to be melted such as incineration residue or fly ash into the furnace, and an overflow of the molten slag S in the furnace are provided. A molten slag outlet (not shown) and a molten metal outlet 2 (tap hole) for extracting the molten metal M accumulated at the furnace bottom are provided.
[0016]
Thus, in the melting furnace 1, when the liquid level of the molten metal M reaches the set value or when the operation of the melting furnace 1 is stopped, the molten metal is moved by the hole opening machine mounted on the mud filling device 3. The hot water outlet 2 is opened so that the molten metal M accumulated at the bottom of the furnace is extracted. When the extraction of the molten metal M is completed, the molten metal outlet 2 is closed by the mud filling device 3.
[0017]
The mud filling device 3 is supported by a frame 4 provided in the vicinity of the melting furnace 1 so as to face the molten metal outlet 2 of the melting furnace 1, and the liquid level of the molten metal M is set to a set value. When it reaches or when the operation of the melting furnace 1 is stopped, the molten metal outlet 2 is opened, and when the extraction of the molten metal M is completed, the molten metal outlet 2 is closed.
The mud filling device 3 is equipped with an opening machine for excavating and removing mud material such as clay filled in the molten metal outlet 2 to open the molten metal outlet 2, and the molten metal having been opened. A mud gun for closing the molten metal hot water outlet 2 by filling the hot water outlet 2 with a mud material such as clay is provided and has a structure similar to that of a conventionally known one.
[0018]
Below the molten metal outlet 2 of the melting furnace 1, there is a downwardly inclined metal outlet 5 for smoothly flowing down the molten metal M discharged from the molten metal outlet 2. Are provided in a continuous state. The metal tap 5 is formed by lining a refractory material on a chute made of a steel plate having a concave cross-sectional shape, and the concave portion serves as a metal discharge path 5a for molten metal M.
A cooling water tank 6 that stores a predetermined amount of cooling water W is provided at a position below the metal tap 5. The cooling water tank 6 includes a metal granulating nozzle 7 that sprays the cooling water W onto the molten metal M that falls into the cooling water tank 6 from the metal hot water trough 5, and granulates and cools the molten metal M. A water-sealed conveyor 8 for carrying out the solidified metal is provided, and each of them has the same structure as a conventionally known one.
Furthermore, a granulated water pump 9 that supplies cooling water W to the metal granulated nozzle 7 and the cooling water tank 6 is connected to the metal granulated nozzle 7 via a cooling water supply pipe 10.
[0019]
The emergency shut-off device A according to the embodiment of the present invention opens and closes the metal shut-off gate A1 whose drive system for opening and closing the metal discharge passage 5a of the metal tap 5 and the outlet side of the molten metal tap 2 is open. The drive system is made up of a cylinder type metal shut-off gate A2, and when the molten metal M is discharged from an unforeseen situation, the amount of water required for the water crushing / cooling of the molten metal M cannot be secured or the molten metal tap 2 is opened. When the mud filling device 3 that automatically closes cannot be used, the hot water of the molten metal M is forcibly stopped.
[0020]
Specifically, as shown in FIGS. 1 and 2, the electromagnet-type metal cutoff gate A1 is supported by the frame 4 and disposed at the upper position of the metal tap 5 and the lower side is an open steel gate cover. 11, a gate 12 made of steel that can be moved up and down in the gate cover 11 and opens and closes the metal discharge passage 5a, and an upper end portion of the gate cover 11, and holds the gate 12 at an upper position by magnetic force. The electromagnet 13 that opens the metal discharge path 5a and a large number of steel ball fillers 14 that are accommodated between the gate cover 11 and the gate 12 and have a cooling effect are released. Thus, the gate 12 is configured to descend by its own weight and close the metal discharge path 5a.
Further, as the gate 12 is lowered, the metal blocking gate A1 is discharged from the discharge port 11a formed in the lower end portion of the gate cover 11 to the upstream side of the gate 11 and the filler 14 in the gate cover 11 is discharged. The filler 14 prevents the molten metal M from leaking from the gap between the gate 11 and the metal discharge path 5a, and cools the molten metal M in the metal discharge path 5a.
[0021]
On the other hand, as shown in FIGS. 1 and 2, the cylinder-type metal shut-off gate A2 is supported by a guide rail 15 disposed at an upper position on the outlet side of the molten metal outlet 2 and the guide rail 15 so as to be movable up and down. A working fluid that includes a steel gate 16 that opens and closes the outlet side of the metal tap 2 and an air cylinder 17 that is provided above the guide rail 15 and that raises and lowers the gate 16 and supplies the working fluid to the air cylinder 17. The solenoid valve (not shown) interposed in the supply pipe (not shown) is released from the excited state, so that the gate 16 descends by its own weight and closes the outlet side of the molten metal tap 2. Yes.
[0022]
Thus, in the melting furnace 1 provided with the emergency shut-off device A described above, the incineration residue and fly ash to be melted supplied into the melting furnace 1 reach a temperature exceeding the melting point by electric energy. It is heated to become a high-temperature liquid melt. Since this melt contains a lot of slag components such as metals including iron and silica in the melt, the melt slag S and the melt slag S located above due to the specific gravity difference are located below. It is separated into molten metal M located at the bottom of the furnace.
[0023]
The separated molten slag S continuously overflows from a molten slag outlet (not shown) provided on the furnace wall of the melting furnace 1 and falls into a water-filled slag cooling water tank 6 (not shown). After becoming crushed slag, it is discharged by a water-sealed slag carry-out conveyor 8 (not shown).
[0024]
On the other hand, the molten metal M remains and accumulates on the bottom of the furnace sequentially as the operation time of the melting furnace 1 elapses, and the liquid level of the molten metal M rises and its thickness increases. When the liquid level of the molten metal M rises, various problems occur. Therefore, the molten metal outlet 2 is opened to extract the molten metal M. Further, when the operation of the melting furnace 1 is stopped, the molten metal outlet 2 is opened to extract the molten metal M accumulated at the bottom of the furnace.
[0025]
Thus, in order to extract the molten metal M accumulated in the bottom of the melting furnace 1, the mud material filled in the molten metal outlet 2 is excavated and removed by an opening machine installed in the mud filling device 3. The molten metal outlet 2 is opened. Thereby, the molten metal M collected at the furnace bottom of the melting furnace 1 passes through the molten metal outlet 2 and is discharged to the metal outlet 5. At this time, the gates 12 and 16 of the metal cutoff gates A1 and A2 are lifted upward by the electromagnet 13 and the air cylinder 17 to open the metal discharge path 5a of the metal tap 5.
The discharged molten metal M flows down in the metal tap 5 and falls from the metal tap 5 into the cooling water tank 6, and after being granulated and cooled by the cooling water W sprayed from the metal granulating nozzle 7. Then, it is completely cooled in the cooling water tank 6 and carried out by the water-sealed conveyor 8.
When the extraction of the molten metal M is completed, the mud material is filled in the molten metal outlet 2 opened by the mud filling device 3, and the molten metal outlet 2 is closed.
[0026]
By the way, in the melting furnace 1 provided with the emergency shut-off device A, when a power failure occurs while the molten metal M is discharged, the electromagnet 13 of the electromagnet-type metal shut-off gate A1 and the electromagnetic of the cylinder-type metal shut-off gate A2 are used. The excited state of the valve is released.
That is, when the excitation state of the electromagnet 13 of the electromagnet-type metal cutoff gate A1 is released, the gate 12 descends due to its own weight and closes the metal discharge path 5a, and as the gate 12 descends, The filler 14 is discharged from the discharge port 11a of the gate cover 11 to the upstream side of the gate 12 and into the metal discharge path 5a. The filler 14 discharged into the metal discharge path 5a prevents the molten metal M from leaking through the gap between the gate 12 and the metal discharge path 5a, and at the same time the molten metal M in the blocked metal discharge path 5a. Cool down. In particular, as shown in FIG. 3, the filler 14 fills the gap formed between the metal tap 5 where the bottom surface is uneven due to the solidified metal M ′ and the lower end surface of the gate 12, Prevent leakage.
When the excitation state of the solenoid valve of the cylinder type metal shut-off gate A2 is released, the gate 16 descends by its own weight and closes the outlet side of the molten metal tap 2.
Accordingly, in the melting furnace 1 provided with the emergency shut-off device A, the metal discharge gate 5a and the outlet side of the molten metal tap 2 are closed by operating the metal shut-off gates A1 and A2, and the molten metal M The hot water can be stopped reliably.
[0027]
On the other hand, even when the mud filling device 3 breaks down while the molten metal M is discharged, the operator manually operates the electromagnet 13 of the electromagnet-type metal cutoff gate A1 and the electromagnetic of the cylinder-type metal cutoff gate A2. By releasing the excitation state of the valve, the gates 12 and 16 are lowered to close the metal discharge passage 5a and the outlet side of the molten metal hot water outlet 2, and the hot water of the molten metal M can be stopped reliably.
[0028]
As described above, in the melting furnace 1 provided with the emergency shut-off device A, even if a power failure occurs during the tapping of the molten metal M and the amount of water necessary for the water crushing and cooling of the molten metal M cannot be secured, the metal Since the hot water of the molten metal M can be reliably stopped by the shut-off gates A1 and A2, the danger of steam explosion can be reliably avoided. In addition, even when the mud filling device 3 fails and the molten metal outlet 2 cannot be closed except during a power failure, the molten metal M can be forcibly stopped by the metal cutoff gates A1 and A2.
[0029]
In the above-described embodiment, a cylinder type metal cutoff gate A2 is provided upstream of the electromagnet type metal cutoff gate A1, and the gate 16 of the metal cutoff gate A2 is lifted upward by the air cylinder 17. However, in another embodiment, the gate 16 of the upstream metal blocking gate A2 may be lifted upward by the electromagnet 13.
[0030]
In the above-described embodiment, the electrometal-type metal shut-off gate A1 and the cylinder-type metal shut-off gate A2 are provided side by side to stop the molten metal M. However, in other embodiments, In this case, the molten metal M may be stopped only by the electromagnet type metal cutoff gate A1, or another metal cutoff gate is provided at both the upstream side position and the downstream side position of the electromagnet type metal cutoff gate A1. (Not shown) may be provided to stop the molten metal M from being discharged.
[0031]
Furthermore, in the above-described embodiment, the emergency shut-off device A is provided in the melting furnace 1 in which the molten metal M is water-crushed. The emergency shutoff device A may be provided in a melting furnace (not shown) that is air-cooled. Also in this case, the same effect as the case where the molten metal M is granulated is obtained.
[0032]
【The invention's effect】
As described above, according to the first aspect of the present invention, an electromagnet-type metal cutoff gate is provided on the outlet side of the molten metal outlet, and the gate is lowered by its own weight by releasing the excitation state of the electromagnet. Since the discharge path is closed, the molten metal can be forcibly stopped when a power failure occurs during the molten metal. As a result, even if there is a power outage during molten metal tapping and the amount of water required for molten metal crushing / cooling cannot be secured, the metal shutoff device can reliably stop molten metal tapping. The danger can be avoided reliably. Even when the mud filling device fails and the molten metal outlet cannot be closed except during a power failure, the molten metal outlet can be forcibly stopped by the metal shut-off gate, which is extremely convenient. However, since the metal shut-off gate lowers the metal discharge path by lowering the gate, it is possible to stop the molten metal hot water in a short time.
Further, according to the first aspect of the present invention, since the filler having a cooling effect is discharged to the upstream side position of the gate as the gate is lowered, the gate and the metal are discharged by the discharged filler. It is possible to prevent the molten metal from leaking from the gap with the path, and to cool the molten metal in the blocked metal discharge path. As a result, the molten metal tapping can be stopped more reliably.
[0033]
The invention according to claim 2 of the present invention can further provide the following effects in addition to the above effects.
That is, in the invention of claim 2 of the present invention , a plurality of metal cutoff gates are disposed on the outlet side of the molten metal outlet, and the gate of each metal cutoff gate closes the metal discharge passage. The metal hot water can be stopped more reliably.
[Brief description of the drawings]
FIG. 1 is a schematic longitudinal sectional view of a melting furnace provided with an emergency shut-off device according to an embodiment of the present invention.
2A and 2B are schematic longitudinal sectional views showing an emergency cutoff device according to an embodiment of the present invention, in which FIG. 2A shows an open state of a metal cutoff gate and FIG. 2B shows a closed state of the metal cutoff gate.
FIG. 3 is a cross-sectional view taken along the line II of FIG.
FIG. 4 is a schematic longitudinal sectional view of a conventional melting furnace.
[Brief description of symbols]
A is an emergency shut-off device, A1 and A2 are metal shut-off gates, M is molten metal, W is cooling water, 1 is a melting furnace, 2 is a molten metal outlet, 5a is a metal discharge passage, 11 is a gate cover, and 12 is a gate. , 13 is an electromagnet, 14 is a filler, 16 is a gate, and 17 is an air cylinder.

Claims (2)

An emergency shut-off device provided on the molten metal outlet outlet side of a melting furnace in which the molten metal accumulated in the furnace bottom is extracted from the molten metal outlet provided on the furnace wall and granulated with cooling water. The shut-off device is located at the upper position of the metal tap that allows the molten metal discharged from the molten metal outlet to flow down, and the lower part is opened in the gate cover so that it can be moved up and down in the gate cover. Drive with a gate that opens and closes the metal discharge path, an electromagnet that holds the gate in the upper position by magnetic force and opens the metal discharge path, and a cooling material that is housed between the gate cover and the gate The system consists of an electromagnet-type metal interrupting gate, and when the electromagnet excitation state is released, the gate descends due to its own weight and closes the metal discharge path. As a result, the filling material in the gate cover is discharged to the upstream position of the gate, and the discharged filling material prevents the molten metal from leaking from the gap between the gate and the metal discharge path, and the blocked metal. An emergency shut-off device for a molten metal outlet, characterized in that the molten metal in the discharge passage is cooled . The emergency shut-off device opens and closes the metal discharge passage of the metal tap, and the drive type that opens and closes the outlet side of the molten metal tap opens from the cylinder-type metal shut-off gate. 2. The emergency shutoff device for a molten metal tap according to claim 1 , wherein the gate of each metal shutoff gate is configured to block the metal discharge passage and the exit side of the molten metal tap.

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