JPS6366881B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a fluid supply device to a molten metal refining tuyere installed at the bottom of a rotary furnace.

[Prior art]

This type of rotary furnace is especially used as production equipment for so-called special steels such as ferroalloys, and its functional effect is that by rotating the furnace body at about 2 to 30 RPM during refining, the molten metal can be stirred to a large extent. Close,
There are points that can accelerate metallurgical reactions. However, in the case of the known LD converter which does not have the function of rotating the furnace body, one of the improvement technologies is the technology for injecting refining gas etc. into the molten metal, which has made dramatic progress. However, especially in the case of rotary furnaces, the means for rotating the furnace body is mechanically complex, and there is no simple and reliable means for supplying refining gas, etc., especially for its control means.
The reality is that we have not yet seen its application.

Therefore, in order to further improve the device functionality,
It has been desired to apply a technique of injecting refining gas or the like into the molten metal.

[Purpose of the invention]

The present invention relates to a fluid supply device for advantageously solving the above-mentioned problems, in which a rotary joint is concentrically connected to the tip of a rotary shaft protruding from the bottom of a rotary furnace, and the fluid supply device The joint is made to correspond to a fluid blowing tuyere installed at the bottom of the furnace and is formed into an individual fluid supply section, and the fluid guided to the rotary joint is controlled in a preset usage pattern of the tuyere according to the furnace condition. In addition to the original characteristics of a rotary furnace, the purpose is to improve refining efficiency by blowing refining gas, etc.

[Structure of the invention]

The present invention will be explained below based on illustrated examples.

FIG. 1 shows the basic concept of this invention, and shows the state of the rotary furnace during refining.

The furnace body 1 is rotatably supported by a plurality of support rollers 5 around an annular tire 3 provided approximately at the center thereof, and by its supporting bearing 6 around a rotary shaft 4 provided at the bottom of the furnace. Note that the support roller 5 and the support bearing 6 are fixed to the support frame 2. The support frame 2 has a pair of trunnion shafts and bearing means (not shown), and is rotatably supported, as in the known LD converter.

Reference numeral 7 denotes a drive device for the support roller 5, and usually an electric drive method or a hydraulic drive method is used.
Reference numeral 10 denotes tuyeres for injecting fluid into the molten metal in the furnace, and 6 to 24 tuyeres are usually arranged on the bottom side wall of the furnace body 1 in single or double rows evenly around the circumference.

The tuyere 10 is, for example, a tuyere used in a known LD converter, as shown in FIG. This is done by fixing it using a mounting bracket provided on the furnace body 1.

As shown in FIG. 1, from the viewpoint of equipment maintenance, the rotating shaft 4 has a portion that is fitted with a support bearing 6 fixed to the support frame 2, separated from the bottom of the furnace body 1. It is also easy to create a removable structure. Note that the rotating shaft 4 is formed in a hollow shape, and a rotating joint 11 is fitted to the tip thereof.

FIG. 3 is a sectional view of the rotary joint 11, and FIG. 4 is a sectional view taken along the line A--A in FIG. As is clear in these figures, the rotary joint 11
consists of a fixed cylinder 12 and a rotating cylinder 13, and the rotating cylinder 13 is fitted onto the tip of the rotating shaft 4, and a fluid supply passage 14 is individually provided inside the rotating cylinder 13. In this direction, holes are radially perforated and opened on the fixed cylinder 12 side. What should be noted here is that the fluid supply path 14 corresponds to the tuyere 10 in terms of quantity, mounting position, and even for each type of fluid. The point is that the selection of the radial fluid supply path 14 also determines the tuyere 10 on the furnace body 1 side.

On the other hand, the rotary cylinder 13 is located on the fixed cylinder 12 side.
An annular groove 15 is provided to correspond to the radial fluid supply passage 14 bored in the rotary joint 11 and to distribute the fluid supplied to the rotary joint 11 to the tuyeres 10 at predetermined locations. The cutout grooves 15 are formed only in a range where fluid can be supplied to all the tuyeres 10 immersed in the molten metal in the furnace in the state of the furnace body 1 during refining. Therefore,
On the contrary, fluid is not supplied to the radial fluid supply passages 14 that are not included in the groove-shaped structure 15. Further, O is provided on both sides of the radial fluid supply path 14.
A known sealing mechanism such as a ring is provided.

Reference numeral 16 denotes a fluid supply port to the rotary joint 11, to which a fluid supply pipe 17 is connected, for example, from a trunnion shaft of the support frame 2 via the support frame 2 and the like.

18 is a bearing, and 19 is a bearing holder. Usually, the rotary joint 11 has a fixed cylinder 12
is used as the fixed side, the fixed cylinder 1
2 is fixedly supported by the support frame 2 via a rotation prevention mechanism (not shown). The rotating cylinder 13 is attached by attaching its flange to the rotating shaft 4. Dedicated piping to each tuyere 10 is arranged and connected to the end of the rotating cylinder 13 on the rotating shaft 4 side.

Next, an embodiment in which a double-pipe structure tuyere 10 is used is shown in FIGS. 5 and 6, and parts equivalent to those in the previous embodiment are denoted by the same reference numerals, and redundant explanation will be omitted.

The tuyere 10 has a double tube structure, and is formed by an inner tube 20 and an outer tube 21, and includes a central tube flow path 22 and an annular flow path 23 formed between the inner tube 20 and the outer tube 21.
Two channels are provided, each having an inlet at its outer end.

On the other hand, the rotary joint 11 is provided with a fluid supply passage 14 similar to that of the previous embodiment, but what should be noted here is that the radial fluid supply passage 14 bored in the rotary cylinder 13 is connected to the two tuyeres 10. They are provided in two rows for the flow passages 22 and 23, one for the central pipe passage 22 and the other for the outer annular passage 23.
Provided for personal use. Similarly, the fixed cylinder 12 also has an annular structure 1 corresponding to the rotating cylinder 13.
5 is provided only in a range corresponding to the pattern setting of the fluid supply to the tuyere 10, and as a result, the fluid supply into the molten metal in the furnace is automatically performed according to the rotation of the furnace body 1. A predetermined amount of a predetermined fluid can be supplied from the predetermined tuyeres 10.

Furthermore, as another embodiment, the fixed cylinder body 12
The ring-shaped structure 15 is provided in a region corresponding to the so-called upper tuyere, which prevents the refining gas from being ejected into the molten metal in the furnace, to prevent clogging of the tuyeres due to scattering of the molten material in the furnace. It is also easy to continuously supply as much fluid as necessary.

In addition, it is easy to equip the above-mentioned rotary joint 11 with a combination of the radial fluid supply passage 14 on the rotating cylinder 13 side and the annular groove 15 on the fixed cylinder 12 side in a combination that matches the optimal refining pattern. Of course, it can be achieved.

〔Effect of the invention〕

As described in detail above, the present invention provides a rotary cylindrical body and a rotary cylindrical body connected to a rotating shaft protruding from the furnace bottom when supplying a plurality of refining fluids installed at the bottom of a rotary furnace. A rotary joint consisting of an exterior rotary cylinder is connected concentrically, and the rotary cylinder has a fluid supply passage corresponding to the tuyeres in the axial direction on the furnace body side and a single passage on the rotary cylinder side. The fixed cylinder is provided with an annular communication groove corresponding to the radial opening of the fluid supply channel, with airtight mechanisms arranged on both sides of the communication groove. A fluid inlet is provided on the outer periphery of the rotary cylinder to communicate with the omitted ring structure, and an end face of the rotary cylinder has a
Since the configuration is such that a supply pipe that guides fluid is connected to the tuyere, the rotation operation of the rotary furnace automatically selects the fluid supply to the tuyere that is at the position where the fluid should be blown into the molten metal. The combination of the radial fluid supply channel on the rotary cylinder side and the annular structure on the fixed cylinder side allows for example to selectively supply two or more types of fluid, and also to prevent clogging of the tuyeres. In addition to the inherent advantages of this type of device, it can also accomplish other functions.
The technology of blowing refining gas into molten metal, which has recently made rapid progress in LD converters, can be easily applied, and as a result, a significant improvement in refining efficiency can be expected.

Furthermore, since the configuration is extremely simple, maintenance can be greatly simplified.

[Brief explanation of drawings]

The drawings are all explanatory diagrams of embodiments of the present invention, and FIG. 1 is a conceptual diagram showing a refining state, and FIGS. 2 to 6 are detailed diagrams of the main parts thereof. DESCRIPTION OF SYMBOLS 1... Furnace body, 2... Support frame, 4... Rotating shaft, 10... Tuyere, 11... Rotating joint, 14...
Fluid supply path, 15... missing annular groove.

Claims (1)

[Claims] 1 The furnace body has a plurality of fluid injection tuyeres at the bottom of the furnace, and a rotating shaft that is rotatably held on a support frame by a rotating shaft protruding from the bottom and an annular tire installed at the center. In the furnace fluid supply system,
A rotary joint is concentrically connected to the tip of the rotary shaft, and the rotary joint is made up of a rotary cylinder and a solid cylinder sheathed on the rotary cylinder, and the rotary cylinder includes:
A plurality of fluid supply passages corresponding to the tuyeres are perforated and opened in the axial direction on the rotating shaft side and radially on the fixed cylinder side, and the radial openings of the fluid supply passages are formed in the fixed cylinder on the other side. A corresponding annular groove is provided with an airtight mechanism arranged on both sides thereof, and a fluid inlet is provided on the outer periphery of the fixed cylinder body to communicate with the annular groove,
A fluid supply device for a rotary furnace, characterized in that a pipe for guiding fluid to a tuyere is connected to an end face of the rotary cylinder.