JP2753540B2 - Furnace cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used for cooling a furnace for melting or refining a treated material, particularly for a furnace having a structure capable of tilting. Furnace cooling system.

[Conventional technology]

This type of cooling device is provided with a spraying means for spraying water droplets of cooling water to the furnace, and a plurality of suction ports for respectively sucking the water that has been blown and flowed down, and is blown down the furnace and flowed down. By removing water through a suction port, some furnaces always allow fresh water droplets to come in contact and efficiently cool the furnace. The plurality of suction ports are provided apart from each other so that water can be removed through the lower suction port even if the furnace is tilted to either side. In this case, even if the upper suction port is exposed to the air, suction can be performed on each of the plurality of suction ports so that water can be removed through the lower suction port without trouble. Pumps are provided individually and connected individually.

[Problems to be solved by the invention]

This conventional furnace cooling device requires a large number of suction pumps, so that the cost of the pump itself increases, of course,
A large number of various facilities required to operate each pump are required, and there has been a problem that facility costs are extremely high.

The present invention has been made in view of the above points, and it is an object of the present invention to enable efficient cooling of a furnace by always contacting new water droplets with the furnace even when the furnace is tilted, and It is an object of the present invention to provide a furnace cooling device capable of maintaining such a state by a single suction pump, and capable of greatly reducing equipment costs.

[Means for solving the problem]

In order to achieve the above object, the present invention employs the means described in the claims, and the operation is as follows.

[Action]

Water droplets are sprayed from the spraying means onto the furnace, and the water droplets cool the furnace. The sprayed down water is sucked through the suction port to prevent stagnation. When the furnace is tilted, by closing the on-off valve connected to the suction port on the upper side, suction of air from the suction port is prevented,
Suction of the water flowing down through the suction port on the lower side,
Removal is performed stably.

〔Example〕

Hereinafter, drawings showing an embodiment of the present application will be described. 2 and 3 showing a known configuration of the furnace and its related equipment, reference numeral 1 denotes a furnace, which is a known arc furnace and is provided on a furnace body platform 2. Reference numeral 3 denotes a furnace body of the furnace 1, which has a space 4 for holding a molten metal 5, and a tapping gutter 6 is provided on one side wall as shown in FIG.
On the opposite side, though not shown, a well-known desalting port is provided. Reference numeral 7 denotes a furnace lid of the furnace 1, in which a plurality of electrodes 8 for heating the arm are inserted in the center, and a dust collecting elbow 9 is connected to a position unevenly distributed from the center. The furnace body platform 2 is supported by a furnace leg 10 and a furnace base 11, and the furnace 1 is tilted in the direction of arrow A in FIG. 3 by a tilting device 12 such as a hydraulic cylinder for tapping, and the furnace 1 is tilted by arrow It can be tilted in the B direction. Reference numeral 13 denotes a tilt detecting means for detecting the tilt of the furnace 1.

Next, reference numeral 15 denotes a well-known furnace lid raising / swinging device, which includes an arm 16 which can be raised and swiveled, and the furnace lid 7 is supported by the arm 16.

Next, reference numerals 17 to 23 denote known structures relating to the electrode 8, 17 is an electrode support, 18 is an electrode support, 19 is an electrode clamp, 20 is an arm busbar, 21 is a flexible electric wire, and 22 is a furnace transformer. , 23 indicate transformer secondary buses, respectively.

In the arc furnace 1 having the above-described configuration, the melting material is charged into the space 4 in a state where the furnace lid 7 is swung up and swirled, and the furnace lid 7 is closed, as is well known. In this state, electric power for generating an arc is supplied to the electrode 8, and the molten material is melted by the arc emitted from the electrode 8 to form the molten metal 5. After the formation of the molten metal 5, the furnace 1 is tilted in the direction of arrow B in FIG. 3 to remove slag, or tilted in the direction of arrow A to discharge the molten metal.

Next, a cooling device for the arc furnace 1 will be described. First, a cooling device for the furnace lid 7 will be described as an example of the cooling device with reference to FIGS. Except for the small ceiling at the center, the furnace lid 7 is formed hollow using a steel plate as shown in FIG. Reference numeral 25 denotes a cooling device attached to the furnace lid, which is composed of a cooling water spraying device 26 and a cooling water discharging device 27 after the cooling water is sprayed. First, the spraying device 26 will be described. Reference numeral 30 denotes a water supply header, which is provided in a substantially annular shape around the center of the furnace cover 7 in the hollow portion of the furnace cover 7 and is connected to a water supply device (not shown). Reference numeral 31 denotes a number of branch pipes radially connected to the header 30. Reference numeral 32 denotes blowing means for blowing water drops for cooling onto the lower plate 7a of the furnace cover 7.
It has a spray nozzle attached to 31. The spraying means 32 may spray mist on the lower plate 7a.

Next, the discharging device 27 will be described. Reference numerals 34 and 35 denote suction ports provided in the hollow furnace lid 7, respectively. The suction ports are provided at one edge of the furnace 1 in the tilting direction and at the other edge thereof, respectively. Reference numerals 36 and 37 denote drain pipes, respectively. One end of each is connected to the suction ports 34 and 35, and the other end is drawn out of the furnace lid. Reference numeral 38 denotes a suction pump provided outside the furnace, and a venturi pump (ejector) is used as an example. Reference numeral 39 denotes a suction port of the pump, and the drain pipes 36, 3
The other end of 7 is connected via respective on-off valves 40, 41 and connecting hoses 36a, 37a. Reference numeral 42 denotes an inlet of driving water in the pump 38, to which a booster pump 43 which is operated by a motor 44 is connected. Reference numeral 45 denotes a discharge port of the pump 38. Next, reference numeral 50 denotes control means for the on-off valve. Reference numeral 51 denotes a control device of the control means, which can control opening and closing of the on-off valves 40 and 41 in response to a tilt signal from the tilt detecting means 13. This control device 51 is a timer
It is also configured to be able to receive a signal from 52 to give an instruction to the on-off valves 40 and 41 to open and close them in a predetermined order at predetermined time intervals.

Next, cooling of the furnace lid 7 by the cooling device 25 having the above configuration will be described.

(A) When the operation of the furnace 1 is performed in a substantially horizontal state, such as melting or refining, the cooling water supplied to the water supply header 30 during the operation of the arc furnace 1 is cooled from a number of nozzles 32 through branch pipes 31. Water drops are sprayed on a lower plate 7a (a plate facing the space 4 in the furnace) of the furnace lid 7. The lower plate 7a of the furnace lid 7 is cooled by the sprayed water droplets. The sprayed water drops flow down the outer periphery of the furnace lid 7 along the lower plate 7a.

On the other hand, in the above operating state,
Driving water is supplied to 42, and a negative pressure is generated in the suction port 39. Further, a time signal is given from the timer 52 to the control device 51, and the control device 51 gives a command to the on-off valves 40, 41 alternately to open and close them as an example of a predetermined order at predetermined time intervals. Therefore, the on-off valves 40 and 41 are alternately opened and closed at predetermined time intervals, and the suction port 34 or 35 is alternately the suction port
Communicated with 39. As a result, the water flowing down to the outer peripheral side of the furnace lid 7 is alternately sucked through the suction port 34 or 35. As a result, the water that has flowed down hardly stays in the furnace lid 7, and a state in which new cooling water droplets are always sprayed on the lower plate 7 a of the furnace lid 7 is maintained. Therefore, the cooling of the lower plate 7a is performed extremely efficiently.

In the case of the above-mentioned drainage, since the suction of the cooling water is performed alternately at predetermined time intervals through the suction ports 34 or 35 as described above, for example, the arc furnace 1 is in a substantially horizontal state, but is slightly tilted, and thus either Even if the suction port 34 or 35 is always above the water surface, the lower suction port 34 or 35
The cooling water is sucked through the furnace to prevent the cooling water from overflowing into the furnace lid 7. The predetermined time is, for example, a time (for example, 2 to 3 minutes) when the cooling water overflows into the furnace lid 7.
By setting the ratio to 1/3 to 1/4, suction alternately through each of the suction ports 34 or 35 is performed frequently, and overflow in the furnace lid 7 is reliably prevented, and the height due to water drops as described above is reduced. It is desirable to ensure efficient cooling.

In the case of operation in the above horizontal state, both open / close valves 40, 41
May be opened together to remove the cooling water through both suction ports 34 and 35 at the same time.

When there are more than two places where the suction ports are provided as in the present embodiment, the method of opening and closing them at a predetermined order at a predetermined time is a method of opening one by one, two by two. Various methods such as a method of sequentially opening may be arbitrarily used.

(B) When the arc furnace 1 is tilted in the direction of the arrow A in FIG. 3 for tapping water In this case as well, the blowing of the cooling water from the spraying means (nozzle) 32 is continued in the same manner as described above. For this reason, the cooling water sprayed on the lower plate 7 a of the furnace lid 7 flows down to the suction port 35 side. The discharge of the cooling water by the discharge device 27 in this case is as follows. When the arc furnace 1 tilts, the tilt detecting means 13 detects the tilt direction (or the angle) and gives a tilt signal to the control device 51.
The control device 51 receives the signal, and the upper suction port 34
A closing command is given to the on-off valve 40 connected to. In this case, needless to say, an open command is given to the other on-off valve 41.
Accordingly, only the suction port 35 communicates with the suction port 39 of the pump 38, and the communication between the suction port 34 and the suction port 39 is cut off. Therefore, there is no possibility that air is accidentally sucked from the suction port 34,
The cooling water flowing down to the side 35 is stably sucked and eliminated through the suction port 35.

When the arc furnace 1 is tilted in the direction of arrow B in FIG. 3 to remove the slag, the on-off valve 40 is opened and the on-off valve 41 is closed by the control signal 51 in response to the tilt signal from the tilt detecting means 13. As a result, the suction of the cooling water through the suction port 34 is stably performed.

In the case where the on-off valve is opened and closed in response to the tilt of the furnace as described above, in this example, the tilt detection means 13 already provided in the furnace can be used, so that special equipment costs for the detection can be eliminated. Moreover, since the tilt detecting means 13 is provided relatively far from the arc electrode through which a large current flows, the tilting means 13 has a larger current than the conventional structure in which a water level detection probe is attached to the furnace lid (closer to the arc electrode). And the reliability of the tilt signal is high.

Next, FIGS. 5 to 7 show different embodiments of the present invention, and show a cooling device for a side wall of a furnace body as another example of a cooling device for a furnace. In the figure, reference numeral 54 denotes a hearth of the furnace body 3e, which is formed of a refractory. Reference numeral 55 denotes a side wall of the furnace body 3e, which is formed of a steel plate so as to be hollow, and has therein the same members as those of the furnace lid. 56 is a switching valve, and each suction port 34e, 35e and one suction port 39e of one pump 38e.
The opening / closing valves between them are constituted by this one switching valve 56, so that the opening / closing between the suction port 34e and the suction port 39e and between the suction port 35e and the suction port 39e can be individually opened / closed. 57 shows a well-known blind plug.

In this configuration, a water droplet for cooling is blown from the spraying means 32e to the inner peripheral plate 55a on the side wall 55, and the cooling is performed. The switching valve 56 is switched as shown in FIG. 6 or FIG. 7 at predetermined time intervals or in accordance with the tilting direction according to the furnace state (horizontal state or tilting state). In the switching state of FIG. 6, the suction port 34e is the suction port 3.
The cooling water is sucked through the suction port 34e in communication with 9e. On the other hand, in the switching state as shown in FIG. 7, the suction port 35e communicates with the suction port 39e, and the cooling water is sucked through the suction port 35e.

In addition, functionally considered to be the same or equivalent to those in the previous figure, the same reference numerals as those in the previous figure denote the same parts as in the previous figure.
And duplicated description is omitted.

〔The invention's effect〕

As described above, in the present invention, when water is sprayed on the furnace 1 to cool the furnace 1, the water sprayed on the furnace and flowing down can be removed. It has the effect of cooling.

Moreover, in the case of the above cooling, no matter which side the furnace 1 tilts, water is removed through the lower suction port, for example, 35 of the plurality of suction ports 34, 35, so that the new water droplets as described above are removed. There is an effect that the cooling state by the contact can be maintained.

In addition, in the present invention, even if the suction from the plurality of suction ports 34, 35 is performed by one pump 38, there is a danger that the air will be sucked as a higher rank among the plurality of suction ports 34, 35. An on-off valve such as an on-off valve, for example, for suction from the suction port on the side that generates
Since it can be stopped at 40, there is a feature that the suction from the lower suction port, for example, 35 can be stably performed. This means that since only one suction pump 38 is required, the cost of the suction pump itself and the cost of the pump are lower than in the prior art in which an individual suction pump is connected to each suction port. The cost of various facilities required for the operation can be eliminated, and there is an effect that the facility cost can be significantly reduced even in view of the necessity of the on-off valves 40 and 41.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a system diagram showing a cooling device for a furnace lid, FIG. 2 is a longitudinal sectional view showing an arc furnace and related equipment, and FIG. 3 is a tilting structure of the arc furnace. FIG. 4 is a longitudinal sectional view of a furnace lid, and FIGS. 5 to 7 show different embodiments. Of these, FIG. 5 is a longitudinal sectional view of a furnace body, and FIG. The figure is a system diagram of a drainage device, and FIG. 7 is a partial view showing a state in which a valve is switched from the state of FIG. 1 ... arc furnace, 32 ... spraying means, 34, 35 ... suction port, 3
8 ... Suction pump, 39 ... Suction port.

Claims (3)

(57) [Claims] A furnace which has a space for introducing a molten metal therein and is freely tiltable is provided with spraying means for spraying cooling water drops on a part of the furnace. In a furnace cooling device, a plurality of suction ports for suctioning water blown down and flowing down to the furnace are attached to the furnace in a state where the suction ports are spaced apart from each other. A cooling device for a furnace, wherein the suction ports of one suction pump are connected to each other. 2. The furnace is further provided with a tilt detecting means for detecting a tilt of the furnace and generating a tilt signal, and receiving the tilt signal and giving a closing command to an on-off valve connected to a suction port on the upper side. 3. The furnace cooling device according to claim 1, further comprising an apparatus. 3. A furnace cooling apparatus according to claim 1, further comprising control means for giving a command to open and close the plurality of on-off valves in a predetermined order at predetermined time intervals. .