JP3609275B2 - Dust collector for electric furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dust collector suitable for use in an electric furnace, and more particularly, to an improvement in a ring hood for an electric furnace.
[0002]
[Prior art]
As a prior art of a dust collector for an electric furnace, for example, there exists a “dust collector in an electric furnace” as seen in Japanese Utility Model Application No. 1-112917 (Japanese Utility Model Application Publication No. 3-52591).
[0003]
The above conventional dust collector is provided with a ring hood around the opening of the upper surface of the electric furnace, and a damper for adjusting the suction air volume is provided at the connecting portion between the end of the ring hood and the suction duct, so that the material is supplied to the electric furnace. When throwing in, the damper is fully opened and a large amount of dust is sucked in, while when the furnace lid is closed and melted, the damper opening is reduced to reduce the suction air volume, and the dissolved material is discharged. When the hot water is discharged from the gate, the opening of the damper is increased to suck in hot air.
[0004]
Further, in the above dust collector, by making the hood cross-sectional area on both sides of the tap out larger than the hood cross-sectional area on the opposite back side, the suction resistance is increased on the back side of the electric furnace, and on the contrary, the tap side is reduced. And it is comprised so that the hot air and exhaust gas which are going to escape from the tap may be sucked more strongly in the state where the furnace lid is covered.
[0005]
[Problems to be solved by the invention]
However, in the above dust collector, although hot air and exhaust gas trying to escape from the tap outlet can be sucked more strongly when the furnace lid is closed, it is in a state where the furnace lid is opened as when the material is charged. At times, contrary to strong suction on the outlet side, the suction power on the heart of the electric furnace and the back side of the furnace (from the front) is weak, so hot air and dust generated from the center and back side However, this means that the suction balance is not good when the furnace cover is open.
[0006]
In addition, when taking out the molten metal from the tap to the ladle by opening the furnace lid, a large amount of dust and exhaust gas will rise as hot air from the tap and rise into the air. The device only copes with this by increasing the suction force by increasing the opening of the damper, and this alone has a problem that dust and exhaust gas scattered in large quantities cannot be reliably collected.
[0007]
Furthermore, the conventional dust collector has a structure in which a suction air volume adjusting damper is provided at a continuous portion of a ring hood and a suction duct, and a dust collector is directly connected to the suction duct as described in the drawings of the publication. Therefore, the dust containing the hot air sucked by the ring hood is directly attached to the damper, the filter of the dust collector, etc., and there is a problem that the suction air volume is adjusted and the dust collection is adversely affected.
[0008]
Therefore, the technical problem of the present invention is to maintain a good suction balance of the ring hood when the furnace lid is open, to keep the suction air volume when the furnace lid is closed, and to take out the molten metal. Provides a dust collector for electric furnaces that can effectively suck a large amount of hot air and exhaust gas generated from the tap at the time of hot water discharge, and at the same time, the dust sucked into the damper and dust collector for adjusting the air volume is not directly attached It is to be.
[0009]
[Means for Solving the Problems]
Means taken in the present invention to solve the above technical problems are as follows.
[0010]
The dust collector has a suction action on the ring hood that is formed in a generally horseshoe shape so as to surround the periphery of the upper opening of the electric furnace and both sides of the tap that protrudes outward from the electric furnace. A dust collector for an electric furnace, configured to collect gas and dust generated from the upper opening and outlet of the electric furnace, and provided with a furnace lid that can be opened and closed on the ring hood. ,
The inner passage of the ring hood is divided into a passage that leads to at least the top opening side of the electric furnace and a passage that leads to the hot water outlet side by a rectifying plate, and an on-off valve is provided in the passage that leads to the hot water outlet side, The on-off valve is configured to close when the electric furnace is in melting operation, and to open when the electric furnace is tilted to discharge molten metal from the hot water outlet. The shape of the suction opening of the ring hood that surrounds both sides of the ring hood is formed in an approximately C shape in plan view, and dust removal boxes are connected to both sides of the ring hood, and each dust removal box is connected to a dust collector. Ducts are connected in series, and a damper for adjusting the suction air volume is provided in the middle of these suction ducts, and the opening of the damper is increased when the furnace lid is opened and when the hot water is discharged to increase the suction air volume. When closed, reduce the suction air volume Be configured to lance well adjusted.
[0011]
According to the above means, when the electric furnace is closed furnace lid is melted materials (metal), the suction action closing valve is closed directly fall short to dust generation is small outflow side In order to concentrate the suction force only on the top opening side of the electric furnace with a large amount of dust generation, open the on-off valve above when tilting the electric furnace and letting out the molten material from the outlet. In order to effectively suck hot air and exhaust gas by exerting a suction force on the tap, it also has a balanced action on the entire periphery of the electric furnace, effectively collecting dust with a relatively small air volume. Make it possible to do.
[0012]
In addition, according to the above means, the shape of the suction port of the ring hood surrounding both sides of the tap hole is formed in an approximately C shape in plan view to widen the suction range, so that when the electric furnace is tilted, A large amount of generated dust and exhaust gas can be effectively collected over a wide range.
[0013]
Further , according to the above means, the air volume adjusting damper is provided at the rear (rear stage) of the dust removal box connected to both sides of the ring hood, and the dust collecting device is provided at the rear of the damper via the suction duct. Since most of the dust sucked in is separated and collected in the dust removal box, no dust or exhaust gas containing steam is directly attached to the damper or the filter of the dust collector. It is possible to solve the problem of malfunction of the apparatus and to reduce the number of maintenance such as cleaning as much as possible.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The embodiment of the dust collector for an electric furnace according to the present invention will be described below with reference to the drawings. FIG. 1 is a partially sectional plan view illustrating the configuration of the present invention, and FIG. 2 is a front view thereof. In the figure, reference numeral 1 generally indicates an electric furnace apparatus, 2 is an electric furnace provided in the electric furnace apparatus 1, 3 is a tapping outlet protruding outside the electric furnace 2, and 4 is The ladle that receives the molten material discharged from the hot water outlet 3 is structured such that the entire electric furnace 2 is tilted and rotated by an operating device (not shown) as shown in FIG.
[0015]
What is generally indicated by reference numeral 10 is that the whole is formed in a substantially horseshoe shape so as to surround the periphery of the upper surface opening of the electric furnace 2 and both sides of the hot water outlet 3, and the suction port is opened on the inner surface. 10A and 10A are neck portions connected to the left and right of the ring hood 10, 10T and 10T are suction tubes connected to the left and right neck portions 10A and 10A, and 12 and 12 are suction tubes for the left and right. 10T, 10T cylindrical bodies connected to the lower side portions 10Z, 10Z, 13 and 13 are left and right dust removal boxes placed and fixed on the bottom surface. The left and right dust removal boxes 13, 13 The front end portions 12A and 12A of the cylindrical bodies 12 and 12 are connected so as to be rotatable (rotatable).
[0016]
Reference numerals 14 and 14 denote suction ducts connected to the left and right dust removal boxes 13 and 13, and the leading ends of these ducts 14 and 14 are connected to a dust collector (not shown). , 13 and suction cylinders 12, 12 so as to affect the ring hood 10, and the entire ring hood 10 is supported by the left and right dust removal boxes 13, 13, and the tip portions 12 </ b> A of the suction cylinders 12, 12.
, 12A (see FIGS. 4 and 5) as a fulcrum, and is tilted and rotated by an operating device (not shown) as shown in FIG. 5 in conjunction with the tilting operation of the electric furnace 2. ing.
[0017]
Reference numeral 5 denotes a furnace lid that opens and closes the opened upper surface opening of the electric furnace 2 except for the outlet 3, and 6 denotes an operating arm that opens and closes the furnace lid 5 by an operating device 7. The furnace lid 5 is used for melting and hot water. Although it is closed and is configured to open like the phantom line shown in FIG. 1 when the material is charged, the furnace lid 5 may be opened and the hot water may be discharged, and the selection is arbitrary.
[0018]
Next, 11S, 11S and 11T, 11T are extended over the internal passage of the ring hood 10 and the left and right neck portions 10A, 10A and the internal passages of the left and right suction cylinders 10T, 10T. The two current plates 11S on the left and right
11T, the ring hood 10 and the internal passage communicating with the ring hood 10 are shown in FIGS. 1 and 3 (enlarged cross-sectional view along the line AA in FIG. 2). The rear passages 11A and 11A that lead to the back side, the middle passages 11B and 11B that lead to the central portion of the electric furnace 2, and the front passages 11C and 11C that lead to both sides of the tap 3 are suctioned from the dust collector. Is divided into an upper surface opening of the electric furnace 2 and a hot water outlet 3.
[0019]
In FIG. 1 to FIG. 3, 10C and 10C are front end suction ports of the front passages 11C and 11C, 10B and 10B are neck portions protruding from the front side of these suction ports 10C and 10C. These left and right tip suction ports 10C, 10C and neck portions 10B, 10B exerting a suction action on both sides of the hot water outlet 3 are formed in an approximately C shape in plan view as shown in FIG. The exhaust gas and dust generated from the hot water outlet 3 are sometimes effectively sucked.
[0020]
In FIG. 1 to FIG. 4, 16P and 16P are on-off valves (poppet valves) for opening and closing the root ends of the front passages 11C and 11C leading to the hot water outlet 3, and 16 and 16 are the on-off valves 16P and 16P. The opening / closing valves 16P and 16P are configured to open only when the hot water is discharged and to exert a suction action on the outlet 3 and close at other times so as not to exert the suction action. .
[0021]
Further, in the figure, reference numerals 15 and 15 denote suction air volume adjusting dampers provided in the middle of the suction ducts 14 and 14 connected to the left and right dust removing boxes 13 and 13, respectively. As described above, when the furnace lid 5 is greatly opened, the opening degree is adjusted to increase the suction action with respect to the ring hood 10, while the opening degree is reduced when the furnace lid 5 is closed as in melting. It adjusts and it is comprised so that the suction effect with respect to the ring hood 10 may be weakened.
[0022]
In FIG. 1, 10H and 10H are inspection windows, 13 'and 13' in FIG. 2 are maintenance doors provided in the dust boxes 13 and 13, and FIGS. In this case, 10W is a dust removal cover protruding on the front surface of the ring hood 10, and this dust removal cover 10W is used for exhaust gas and dust rising from the outlet 3 when the electric furnace 2 is tilted as shown in FIG. The rise can be suppressed, and this can be guided and sucked toward the tip suction ports 10C, 10C opened in the above-mentioned C shape.
[0023]
Next, the operation of the dust collector for an electric furnace according to the present invention will be described according to the flowcharts shown in FIGS.
[0024]
Steps S1 to S10 shown in FIG. 6 explain the processing operation when the material is charged into the electric furnace 2 in order, and when the material is charged, as shown in steps S4 and S5, the dampers 15, 15 Is fully opened to maximize the suction force to the ring hood 10, while closing the on-off valves 16P and 16P (poppet valves) so that the suction force does not reach the outlet 3 side, thereby reducing the suction force loss. The system is configured to reduce the amount of suction and to balance the suction by concentrating the suction force on the electric furnace 2 side.
[0025]
Steps S11 to S17 shown in FIG. 7 (a) explain the processing operation at the time of pouring hot water in order, and at the time of pouring hot water, the dampers 15 and 15 are fully opened at step S12, and the on-off valves 16P, 16P is also opened and exerts a strong suction action on both the electric furnace 2 and the tap 3 to prevent dust generation during the tap.
[0026]
Steps S20 to S24 shown in (b) of FIG. 7 describe the processing operation after the hot water step by step. After the hot water, the furnace lid 5 is closed in step S20, and further in step S24. The dampers 15 and 15 are fully closed to finish the process.
[0027]
In the flow chart shown in FIG. 7 (a), the hot water is discharged while the furnace cover 5 is closed in step S11. However, there is a case where the hot water is discharged by opening the furnace cover 5. It is optional.
[0028]
【The invention's effect】
As described above, according to the dust collector for an electric furnace according to the present invention, the suction action from the dust collector to the ring hood can be adjusted according to the operation of the electric furnace to achieve the suction balance. It is possible to perform effective dust collection with a small amount of air flow, and it is possible to reduce the size of the dust collector, and a damper and dust collector for adjusting the air volume are provided at the rear stage of the dust removal box. Combined with the fact that the amount of dirt is reduced as much as possible, it is suitable for use as an electric furnace apparatus as shown in the figure.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional plan view illustrating a configuration of a dust collector for an electric furnace according to the present invention.
FIG. 2 is a front view of the present invention.
FIG. 3 is an enlarged cross-sectional view of the ring hood taken along the line AA in FIG.
FIG. 4 is a side view of the present invention.
FIG. 5 is a side view illustrating the state of tilting rotation of the electric furnace.
FIG. 6 is a flowchart illustrating a processing procedure when a material is input according to the present invention.
7A is a flowchart for explaining a processing procedure at the time of pouring hot water according to the present invention, and FIG. 7B is a flowchart for explaining a processing procedure after the pouring of hot water.
[Explanation of symbols]
2 Electric furnace 3 Hot water outlet 5 Furnace lid 10 Ring hood 10C Suction port 11S, 11T for hot water outlet Rectifier plate 11A Rear passage 11B Middle passage 11C Front passage 13 Dust removal box 14 Suction duct 15 leading to dust collector Opening / closing damper 16P Valve (poppet valve)

Claims (1)

The dust collector has a suction action on the ring hood that is formed in a generally horseshoe shape so as to surround the periphery of the upper opening of the electric furnace and both sides of the tap that protrudes outward from the electric furnace. A dust collector for an electric furnace, configured to collect gas and dust generated from the upper opening and outlet of the electric furnace, and provided with a furnace lid that can be opened and closed on the ring hood. ,
The inner passage of the ring hood is divided into a passage that leads to at least the top opening side of the electric furnace and a passage that leads to the hot water outlet side by a rectifying plate, and an on-off valve is provided in the passage that leads to the hot water outlet side, The on-off valve is configured to close when the electric furnace is in melting operation, and to open when the electric furnace is tilted to discharge molten metal from the hot water outlet. The shape of the suction opening of the ring hood that surrounds both sides of the ring hood is formed in an approximately C shape in plan view, and dust removal boxes are connected to both sides of the ring hood, and each dust removal box is connected to a dust collector. Ducts are connected in series, and a damper for adjusting the suction air volume is provided in the middle of these suction ducts, and the opening of the damper is increased when the furnace lid is opened and when the hot water is discharged to increase the suction air volume. When closed, reduce the suction air volume Electric furnace dust collector, characterized by being configured to lance better regulation.

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