JPH0426446Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention supplies various fluids such as oxygen, powder, and protective gas to the converter type furnace body from a fluid supply source in a smelting reduction furnace and a scrap melting furnace. The present invention relates to a fluid supply device for.

[Prior Art] Conventionally, methods for producing molten pig iron include a method using a blast furnace to reduce iron ore, and a method using a shaft furnace and an electric furnace in combination. There was also a method of using an electric furnace to melt the scrap.

However, in the method using a blast furnace, a large amount of coke is used as a heat source and a reducing agent. In addition, iron ore, which is an iron source, is usually charged into a blast furnace as sintered ore in order to improve air permeability and reducibility within the furnace. Therefore, the blast furnace method requires coke oven equipment for dry distilling highly caking coal and sintering equipment for producing sintered ore. Therefore, it requires not only large equipment costs but also a large amount of energy and labor.
The drawback was that it led to a rise in processing costs. Further, there is also the problem that the supply of strongly coking coal is likely to be unstable because it is present in a small amount worldwide and unevenly distributed in different regions.

On the other hand, the method of reducing iron ore using a shaft furnace requires pretreatment of the iron ore, for example, into pellets, and has the disadvantage that it consumes large amounts of expensive natural gas and electricity as reducing agents and heat sources.

On the other hand, the method of obtaining hot metal by melting scrap in an electric furnace requires a large amount of electricity, but electricity is dependent on petroleum, whose production is unstable and is expected to be depleted in the near future, and the price of electricity is high. Fluctuations and soaring prices are reflected in electricity costs, making it extremely difficult to stably produce low-priced hot metal.

The smelting reduction method and the scrap mass melting method are attracting attention as alternatives to the conventional hot metal production techniques described above. In the smelting reduction method, molten iron alloys can be produced using small-scale equipment without being restricted by the raw materials used, and in the scrap large-volume melting method, thermal coal can be used as a raw material because of its low cost and stable supply. Therefore, it is possible to operate with low running costs.

Both of these methods require the use of a converter-type furnace body, and a large amount of powder, oxygen, and protective gas for the tuyeres are blown into the furnace through a nozzle, but it is possible to supply powder fluid in this way. No equipment was provided for this purpose. Conventionally, as a method of supplying a small amount of fluid into a top-bottom blowing converter, the method shown in Figure 4 is
An example of circulating oxygen and protective gas as in the publication,
JP-A No. 49-63609 shown in FIG. 5 discloses an example in which a powder such as quicklime that does not undergo an oxidation reaction is carried and blown into an oxygen stream.

[Problems to be solved by the invention] However, in cases where combustible powder such as fine ore or carbon powder is injected at the same time as oxygen, it is possible to avoid explosive combustion and to install it in a limited space. A compact feeding device was not provided. When oxygen and combustible powder are transported, the example shown in Figure 4 has a flow path configuration in which oxygen and powder are adjacent to each other within the same rotary joint, which could lead to damage to the rolling seal within the rotary joint or wear of the piping. If the two fluids mix, a serious disaster will occur due to ignition and combustion. Further, in the example shown in FIG. 5, oxygen and powdered coal cannot be conveyed through the same flow path. As a countermeasure, even if an inert gas is used as the carrier gas and a separate oxygen flow path is installed,
As long as both fluids are passed through the same rotary joint, the problem is the same as the example shown in FIG. 4.

In this way, these methods can be used for the smelting reduction method and the scrap melting method, which require large quantities of various fluids such as oxygen, combustible powder, and protective gas to be supplied to the converter, instead of the conventional supply method using only a single rotary joint. It could not be applied practically.

It is an object of the present invention to solve these problems and provide a compact and inexpensive supply device that can safely and reliably supply various fluids to required locations.

[Means for Solving the Problems] In order to achieve the above object, the present invention is configured as follows. In other words, it is a smelting reduction furnace or a scrap melting furnace that has a bottom blowing or side blowing nozzle at the bottom of the furnace. In a fluid supply device for supplying various fluids such as gas and protective gas, a rotary joint having a rotor and a stator is provided at the end of the trunnion shaft, and (a) a central fluid passage is provided at the center of the rotation axis of the rotary joint. (b) One or more sets of fluid passages are bored in the rotor and the stator, and each fluid passage is connected to the stator. (c) fixing a hose drum to said rotor or trunnion shaft, and connecting one or more flexible hoses wound around said hose drum; A fluid supply device for a smelting reduction furnace and a scrap melting furnace, characterized in that one end thereof is communicated with respective fluid passages provided in a trunnion shaft.

[Operation] When supplying flammable powder, protective gas, and oxygen at the same time, the present invention prevents the flammable powder from entering the central fluid passage.
Combustible powder and oxygen can be completely removed with one fluid supply device by circulating protective gas through multiple fluid passages drilled in the rotor and stator, and oxygen through the flexible hose of the hose drum. It can be separated and fed to a smelting reduction furnace or a scrap melting furnace.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, 9 is a pipe for supplying combustible powder such as ore powder or carbon powder, and the pipe 11 is arranged in an opening in the trunnion shaft 1 via a central fluid passage 10 in the rotary joint 2. , and is connected to a tuyere provided at the bottom of the furnace via an outlet pipe 12. Central fluid passage 1
An isolation space 15 is provided around the outer periphery of the powder, and the structure is such that even if the powder flow path is broken, the powder does not mix with other fluids immediately. Cooling water is supplied from the stator 23 of the trunnion shaft-side rotary joint 2 to the furnace bottom through the cooling water supply port 16 via the supply channel 17 of the rotor 22 and through the sleeve 20 fitted to the trunnion shaft. Drainage water can also be discharged by flowing in the opposite direction using similar measures, but this is omitted in this figure because the explanation would be redundant. 1
Reference numeral 3 denotes a protective gas passage arranged in a polyaxial manner, through which the protective gas is supplied from the gas supply passage 18 to the furnace through a protective gas outlet pipe 19 and a sleeve 20 in the same manner.

On the other hand, a support 3 is attached to the rotor 22 of the trunnion shaft-side rotary joint 2 as an oxygen flow path, and a hose drum 6 is attached to the support 3. The hose drum 6 is provided with one or more flow path pipes 5 having a diameter of 10A to 150A, to which one end of a flexible hose 4 through which oxygen flows is connected. The hose 4 has a drum rotary joint 8 disposed at a fixed part near the converter trunnion axis, and is wound around a hose winder 7 capable of supplying fluid, and its end is connected to the hose winder 7. It is connected to a fluid pipe 14 provided in the machine 7. Further, one end of a hose 4 is connected to a flow path piping 5 provided in the hose drum 6 on the trunnion shaft side, and is passed through a pipe 21 loosely fitted into an opening in a sleeve 20 to a tuyere provided at the bottom of the furnace. It has a structure that supplies oxygen. FIG. 3 shows an example in which the fixed example of the hose is connected to a building fixed piping in the present invention.

In the rotary joint configured as described above, as the converter trunnion shaft rotates, the flexible hose is wound around the hose drum on the trunnion shaft side, and the flexible hose is configured so that the deflection can be absorbed by the hose, and the flexible hose can be tilted to the maximum tilting angle limit. The structure is such that there is some slack left in the hose. When the converter trunnion shaft rotates in the opposite direction to that described above, the hose is unwound from the hose drum on the trunnion shaft side by the opposite action.

Since the present invention has the above-described configuration, as the trunnion shaft of the converter type furnace body rotates, the hose is wound around the hose drum 6 on the trunnion shaft side, and at the same time, the hose winder 7 disposed on the fixed side Since the hose is let out from the melting reduction furnace or the melting reduction furnace or It is possible to provide a realistic structure that can reliably supply oxygen and pulverized coal, which are always dangerous, in a scrap melting furnace.

[Effects of the invention] As explained above, the present invention is effective in reducing combustible powder in equipment such as smelting reduction furnaces and scrap melting furnaces where flammable powder, oxygen, and tuyere protective gas must be safely and reliably supplied. The purpose is to provide a compact supply device that avoids mixing of body and oxygen and causing explosive combustion and can be installed in a limited space. Moreover, there is an advantage that it is not necessary to use expensive materials for the rotary joint and the fluid supply channel wall in the converter trunnion shaft, and maintainability is improved. In addition, since the oxygen supply path is added outside the rotary joint, the rotary joint can be made more compact and lightweight, and as a result, it can be made cheaper.

[Brief explanation of the drawing]

FIG. 1 is a structural diagram of an embodiment of the device of the present invention. Second
FIG. 3 is a side view of the embodiment of the present invention. Figure 4,
FIG. 5 is a drawing of the prior art. 1...Converter trunnion shaft, 2...Rotary joint, 3
...Support, 4...Flexible hose, 5...
...Flow path piping outlet, 6...Hose drum, 7...Hose winder, 8...Rotary joint for hose winder, 9
... Powder supply pipe, 10 ... Central fluid passage, 11 ...
...Powder pipe, 12...Outlet pipe, 13...Independent flow path, 14...Hose winder pipe, 16...Cooling water supply pipe, 17...Cooling water flow path, 18...Protection gas supply pipe , 19...Protective gas outlet pipe, 20...Sleeve, 21...Pipe, 22...Rotor, 23...
... Stator, 25... Trunnion bearing, A... Protective gas, B... Cooling water, C... Powder + carrier gas, D... Oxygen.

Claims (1)

[Scope of Claim for Utility Model Registration] A smelting reduction furnace or a scrap melting furnace having a bottom-blowing or side-blowing nozzle at the bottom of the furnace, in which the furnace body is In a fluid supply device for supplying various fluids such as oxygen, combustible powder, and protective gas to a computer, a rotary joint having a rotor and a stator is provided at the end of the trunnion shaft, and (a) the center of the rotation axis of the rotary joint is (b) providing one or more sets of fluid passages in the rotor and the stator, each with a central fluid passage communicating from the stator through the rotor to a fluid passage provided in the trunnion shaft; (c) fixing a hose drum to the rotor or trunnion shaft, and connecting a fluid passage from the stator through the rotor to a fluid passage provided in the trunnion shaft; A fluid supply device for a smelting reduction furnace and a scrap melting furnace, characterized in that one end of one or more flexible hoses is communicated with each fluid passage provided on a trunnion shaft.