JPH0979754A - Continuous melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rotary type burner furnace performing a melting continuously by connecting a hopper for supplying material to a material melting chamber of the body of a melting furnace through a shutter to provide a sprue at an end part on the side of a molten metal holding chamber of the body of the melting furnace. SOLUTION: The body 1 of a melting furnace rotates about a axis core X and the inside of the furnace is divided into a material melting chamber 1a and a molten metal holding chamber 1b axially by a central partition plate 3 provided at the central part thereof. The central partition plate 3 is provided with a through hole for passing a burner flame 9a and a through hole that allows moving of molten metal 14 melted in the material melting chamber 1a by a burner 9 to the molten metal holding chamber 1b. A path is connected to one end 6a of the body 1 of the melting furnace to supply the melted material 7 to the material melting chamber 1a, the burner 9 is arranged to be rotatable having a screw conveyor 8 and a hopper 10 having a shutter 10a for controlling the delivery of the melted material 7 is mounted in a path where the burner 9 is housed. On the other hand, a sprue 19 is provided at the other end 6b of the body 1 of the melting furnace.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a rotary burner furnace capable of continuously melting materials.

[0002]

2. Description of the Related Art In a conventional rotary burner furnace, as shown in Japanese Patent Application Laid-Open No. 6-73570, material charging → total melting of charged material → tapping of all molten metal → discharge of slag →
Melting is performed in a cycle that only batch-type melting is possible, such as the next material input. The reason why it can be done only in batch mode is that unmelted material is mixed in the molten metal when it is continuously melted, and it is difficult to discharge only the molten metal. When the material is continuously sent, the molten metal is maintained at a sufficiently high temperature and discharged. It becomes difficult, etc.

[0003]

Since the conventional rotary burner furnace can only perform batch melting, the furnace body is tilted for each batch to perform tapping, discharge slag, and material charging. During this time, the heat accumulated in the furnace wall is released to the outside of the furnace, so that the thermal efficiency and thermo-economical efficiency deteriorate. An object of the present invention is to provide a rotary burner furnace (continuous melting furnace) that enables continuous melting.

[0004]

The present invention which achieves the above object is as follows. (1) A central partition plate having a melting furnace main body rotatably provided around an axis and an inside of the melting furnace main body divided axially into a material melting chamber and a molten metal holding chamber and having a through hole for passing the molten metal. A burner provided at an end of the melting furnace main body on the side of the material melting chamber, a hopper for material supply connected to the material melting chamber of the melting furnace main body via a shutter, and the melting furnace main body And a molten metal outlet provided at the end on the molten metal holding chamber side of the continuous melting furnace. (2) Melting furnace body rotatably provided around an axis inclined from the horizontal, a burner and a tap hole provided at the lower end of the melting furnace body, and an upper part of the melting furnace body From a hopper for material supply connected to the end on the side, a convex portion provided on the hopper side portion of the inner surface of the melting furnace main body and a concave portion provided on the tapping side portion, Becomes a continuous melting furnace. (3) A melting furnace body having a two-layer structure of a fixed outer furnace body and a rotatable inner furnace body having a plurality of through holes in the furnace wall, and a melting material supply device connected to the inside of the inner furnace body And a burner fixed to the outer furnace body to heat the material through the through hole of the inner furnace body, and a spout for discharging the molten metal flowing through the through hole of the inner furnace body at the bottom of the outer furnace body through the shutter. And a continuous melting furnace.

In the above (1), since the melting furnace main body is divided into the material melting chamber and the molten metal holding chamber by the central partition plate, the molten metal is separated from the unmelted material and stored in the molten metal holding chamber, where it is heated to a high temperature. It is maintained and hot water is discharged. Therefore, it is possible to solve the problems when the conventional batch dissolution is made into continuous dissolution, that is, the difficulty of separating the molten metal and the undissolved material and the difficulty of keeping the molten metal at a high temperature, and continuous melting becomes possible. In the above (2), the inner surface of the melting furnace main body is provided with the convex portion on the hopper side and the concave portion is provided on the taphole side portion, so that the material supplied from the hopper side is the kiln. As the type melting furnace main body rotates, it gradually moves to the burner side while being caught in the convex portion, and is melted during that time. The molten metal flows into the concave portion without being caught in the convex portion, accumulates in the concave portion, is maintained at a sufficiently high temperature, and eventually comes out of the molten metal outlet. Therefore, continuous dissolution is possible. In the above (3), since the melting furnace main body has a two-layer structure and the inner furnace main body has a rotatable structure having a through hole, the material is melted in the inner furnace main body and the molten metal penetrates the inner furnace main body. After passing through the hole, it is stored in the outer furnace body, where it is kept at a sufficiently high temperature and then tapped from the tap hole. Therefore,
Continuous dissolution is possible.

[0006]

1 to 3 show a first embodiment of the present invention, FIGS. 4 to 6 show a second embodiment of the present invention, and FIG.
Shows a third embodiment of the present invention. First, a first embodiment of the present invention will be described with reference to FIGS. The melting furnace main body 1 is a stainless steel cylindrical body having conical portions at both ends, and is rotated around an axis X. An electric motor (not shown) or the like is used as a drive source for this rotation. On the other hand, the furnace body is composed of a furnace wall 2 made of a refractory material lined with alumina, silica, etc., and the inside of the furnace is a central partition plate 3 provided in the central part, and two chambers in the axial direction, namely, the material melting chamber 1a And a molten metal holding chamber 1b. As shown in FIG. 2, the central partition plate 3 has a through hole 4 through which the burner flame 9a passes and a through hole for allowing the molten metal 14 melted by the burner 9 in the material melting chamber 1a to move to the molten metal holding chamber 1b. The hole 5 is opened. A passage for supplying the melting material 7 to the material melting chamber 1a is connected to one end 6a of the melting furnace body 1, and a burner 9 having a screw conveyor 8 is rotatably provided therein. An electric motor (not shown) is used as a drive source for the screw conveyor 8.
Are used. Further, a hopper 10 having a shutter 10a for storing the melted material 7 and controlling the cutout is attached to the passage in which the burner 9 is housed. The burner 9 includes a fuel gas and a burner material (for example,
It has the function of controlling the flow rate of pure oxygen) accurately. On the other hand, the other end 6b of the melting furnace main body 1 has a noro holding plate 11 (the tip position is set lower than the other end 6b) having a shape as shown in FIG. An exhaust gas duct 13 containing a pair 12 is attached. The other end 6b is set to be lower than the central partition plate 3 and the melting furnace main body end 6a so that hot water can be continuously discharged. Reference numeral 19 is a hot water outlet. This other end 6
A gutter 17 for guiding the molten metal 14 to the holding furnace 15 or the ladle 16 is provided in the lower part of b.

In the first embodiment of the present invention, continuous dissolution is carried out as follows. The interior of the melting furnace is preheated while the burner 9 is ignited and the furnace body is rotated while the shutter 10a of the hopper 10, which is a material supply device, is closed. After the preheating is completed, the shutter 10a is opened and the screw conveyor 8 is activated. As a result, the melting material 7 is supplied to the material melting chamber 1a, and the heat obtained directly from the burner 9 (when pure oxygen is used as an auxiliary combustion material, the flame temperature reaches 2500 ° C. or higher).
And is rapidly melted by the radiant heat from the preheated furnace wall 2. Here, the material melting chamber 1a and the molten metal holding chamber 1b
Since it is communicated through the through hole 5, only the molten metal 14
Molten metal holding chamber 1 until a and 1b have the same surface level
Move to b. Then, the molten metal is maintained at a sufficiently high temperature in the molten metal holding chamber 1b. Finally, the molten metal 14 is melted while adjusting the burner combustion conditions and the melted material supply conditions so that the height of the molten metal stops within the range of 6b to 6a. By doing so, the molten metal 14 can be continuously discharged. At this time, the slug 18 is the holding plate 11
Since it is pressed by, it is not discharged together with the molten metal from the tap hole (the other end 6b). The molten metal 14 is slag 1
When 8 is generated, it is covered with this slag 18 thereafter and is not newly oxidized. Since the slag has a molten metal protecting action, it is not necessary to remove the slag 18. By using such a continuous melting furnace, it becomes possible to improve the thermal efficiency.

Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. The continuous melting furnace of the second embodiment is an oxygen burner type rotary kiln continuous melting furnace. The melting furnace main body 21 is a stainless steel cylindrical body and is rotatable around an axis X inclined from the horizontal. The furnace body 21 is rotated by a ring-shaped member 22 and a rotating roller 23 attached to the outside of the cylindrical body. The furnace wall 24 is made of a refractory material lined with alumina or silica. For the refractory material, in the material melting region 25a on the side opposite to the burner, as shown in FIG.
6 are formed, and a plurality of recesses 24b as shown in FIG. 6 are provided in the melt holding area 25b on the burner side. The convex portion 24a may have a spiral shape.

A hopper 28 for supplying the melting material 27 to the material melting region 25a is attached to one end 26a of the melting furnace main body 21. Further, an oxygen burner 29 having the same function as in the first embodiment and a tap hole 31 for tapping the molten metal 30 are attached to the other end 26b. A gutter 34 for guiding the molten metal 30 to the holding furnace 32 is provided below the other end 26b.

In the second embodiment of the present invention, continuous dissolution is carried out as follows. The oxygen burner 29 is ignited in a state where the melting material 27 is not charged, and the inside of the melting furnace is preheated while rotating the furnace body. After completion of preheating, the melting material 27 is supplied from the hopper 28 to the material melting area 25a. The supplied melting material 27 gradually moves to the burner side while being caught by the convex portion 24a of the furnace wall. In this process, the melted material 27 is directly obtained from the burner 29 (when pure oxygen is used as an auxiliary burner, the flame temperature reaches 2500 ° C. or higher) and from the furnace wall 24 and the convex portion 24a accumulated by the burner flame. It is rapidly melted by radiant heat. The molten metal 30 generated in the material melting region 25a has a convex portion 24a.
It is separated from the unmelted material that is still caught in the metal, moves to the molten metal holding region 25b on the lower side of the furnace (6b side) by its own weight, and accumulates in the recess 24b. The molten metal 30 is here heated to a sufficiently high temperature by the heat from the burner and the furnace wall, and then discharged from the tap hole.

Next, a third embodiment of the present invention will be described with reference to FIG. The continuous melting furnace of the third embodiment comprises an inner cylinder rotary burner continuous melting furnace. The melting furnace body 41 has a two-layer structure including a fixed outer furnace body 41a and a rotatable inner furnace body 41b. The outer furnace body 41a is a stainless steel cylindrical body, and the furnace wall is made of alumina, silica, or the like, and is mounted on the pedestal 42. A plurality of oxygen burners 43 using oxygen as an auxiliary material are attached to the upper part of the outer furnace body 41a, and a tap hole 54 and a shutter 44 for discharging the molten metal 53 are provided to the lower part of the outer furnace body 41a. And the molten metal payout pipe 45 is connected.

The inner furnace body 41b is a cylindrical body made of recrystallized SiC and has a plurality of through holes 46 through which the molten metal passes. Both ends of the inner furnace body 41b are outer furnace body 41
It is rotatably supported by a, and a ring-shaped member 47 and a rotating roller 48 are attached to one end 41d of the one end 41d, whereby it is rotated about the axis X. Further, the other end 41c of the inner furnace body 41b is provided with a charging device 50 for supplying the molten material 49 into the furnace, and the end 41d on the opposite side thereof is provided with the auxiliary material 51 in the furnace. An input device 52 for supplying is provided.

In the third embodiment of the present invention, continuous dissolution is carried out as follows. First, the burner 43 is ignited in a state where the molten material 49 is not charged, and preheating is performed while rotating the inner furnace body 41b. After the completion of preheating, the melted material 49 is supplied to the inside of the inner furnace body 41b using a charging device. The melting material 49 is melted by the heat from the burner 43 and the radiant heat. At this time, the dissolution is advanced while adding the required amount of the auxiliary material 51 from the one end 41d. Only the molten metal 53 is the inner furnace body 4
It passes through the through hole 46 of 1b and flows down to the outer furnace body 41a. The molten metal 53 accumulated in the outer furnace body 41a is burner 4
After the temperature is raised to the temperature required for tapping by the radiant heat of the inner furnace body 41b stored by 3, the shutter 44
The hot water is tapped from the hot water outlet 54.

[0014]

According to the furnace of claim 1, since the central partition plate is provided, the molten metal is separated from the unmelted material and stored in the molten metal holding chamber, and the temperature is raised to the temperature required for tapping. It will be discharged later. This allows continuous dissolution. According to the furnace of claim 2, since the convex portion is provided in the hopper side portion of the inner surface of the furnace wall and the concave portion is provided in the hot water outlet side portion, the molten metal melted in the convex portion area is formed from the undissolved material caught on the convex portion. It is divided, moves to the recessed region, accumulates in the recessed part, is heated to a sufficiently high temperature, and is tapped. This allows continuous dissolution. According to the furnace of claim 3, since the melting furnace main body has a two-layer structure, the inner furnace main body is rotatable, and has a through hole, the material is melted inside the inner furnace main body, and only the molten metal is melted. Passes through the through hole, is stored in the outer furnace body, is sufficiently heated, and then is tapped. Therefore, continuous dissolution is possible.

[Brief description of drawings]

FIG. 1 is an overall sectional view of a continuous melting furnace according to a first embodiment of the present invention.

2 is a cross-sectional view of a central partition plate portion of the furnace of FIG.

FIG. 3 is a cross-sectional view of the vicinity of the tap hole of the furnace of FIG.

FIG. 4 is an overall sectional view of a continuous melting furnace according to a second embodiment of the present invention.

5 is a perspective view of a convex area on the inner surface of the furnace of FIG. 2. FIG.

6 is a perspective view of a recessed area on the inner surface of the furnace of FIG.

FIG. 7 is an overall sectional view of a continuous melting furnace according to a third embodiment of the present invention.

[Explanation of symbols]

 1 Melting furnace main body 1a Material melting chamber 1b Molten metal holding chamber 3 Central partition plate 5 Through hole 9 Burner 10 Hopper 19 Hot water outlet 21 Melting furnace main body 24a Convex portion 24b Recess 25a Material melting area 25b Molten metal holding area 28 Hopper 31 Hot water outlet 41 melting furnace main body 41a outer furnace main body 41b inner furnace main body 43 burner 44 shutter 46 through hole 52 charging device 54 hot water outlet

Claims (3)

[Claims] 1. A melting furnace main body rotatably provided around an axis, a central part having a through hole for passing a molten metal and dividing the inside of the melting furnace main body into a material melting chamber and a molten metal holding chamber. A partition plate, a burner provided at the end of the melting furnace main body on the side of the material melting chamber, a hopper for material supply connected to the material melting chamber of the melting furnace main body through a shutter, and the melting A continuous melting furnace comprising a molten metal outlet provided at an end portion of the furnace body on the molten metal holding chamber side. 2. A melting furnace main body rotatably provided around an axis inclined from the horizontal, a burner and a tap hole provided at a lower end of the melting furnace main body, and the melting furnace main body A material supply hopper connected to the upper end of the melting furnace, a convex portion provided on the hopper side portion of the inner surface of the melting furnace main body and a concave portion provided on the tap hole side portion A continuous melting furnace consisting of. 3. A melting furnace body having a two-layer structure of a fixed outer furnace body and a rotatable inner furnace body having a plurality of through holes in a furnace wall, and a melting material connected to the inside of the inner furnace body. A supply device, a burner fixed to the outer furnace body to heat the material through a through hole in the inner furnace body, and a melter that is provided in the lower portion of the outer furnace body and flows down through the through hole in the inner furnace body through a shutter. A continuous melting furnace consisting of an outlet.