JPH062891B2 - Reactor-Steelmaking raw material supply method - Google Patents

Description

Detailed Description of the Invention

 Purpose of the invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a raw material supply method when carrying out reactor ironmaking.

[Prior art]

The inventors have further established a technique for producing iron (which means pig iron and steel) by melting scrap, using carbonaceous materials and oxygen gas, without using electric power or coke. And this is the "reactor steelmaking method"
Already disclosed (Japanese Patent Application Laid-Open No. 57-201982).
No. 6). In this iron-making method, not only scrap but also reduced iron can be used as a raw material, but when the reduced iron is targeted, the optimum operating conditions have been determined, which is also disclosed (Japanese Patent Application No. 59-35842). . The basic method of "reactor ironmaking" is the molten iron stored in the reactor leaving a space above (hereinafter "molten iron").
Scrap and carbonaceous material are charged into the molten iron, oxygen gas is blown into the molten iron to stir the molten metal, the carbonaceous material is mainly oxidized to CO, and the space above the molten iron surface in the reactor is also filled. Blow in oxygen gas
It oxidizes the gas to CO ₂ , melts the charging scrap with the heat generated by the oxidation, and uses it for preheating the scrap charging the high temperature exhaust gas. In a subsequent improved method, the oxidation of CO to CO ₂ is carried out outside the reactor. Regarding the apparatus used for "reactor iron making", the basic apparatus is disclosed in the above-mentioned JP-A-57-198206, and the improved apparatus is disclosed in JP-A-58-199809 and Japanese Patent Application No.
-24370. In the improved device, the scrap preheating shaft is placed directly above the reactor, and a damper is installed below the shaft,
By closing this at the time of preheating and holding the scrap, and opening it at the time of charging and dropping it directly into the reactor, it was possible to reliably charge regardless of the shape and size of the scrap. Cooling water is passed inside to prevent burnout of the damper, but if it is exposed to high temperature exhaust gas, its life will be shortened.
Therefore, the effect was obtained by introducing the exhaust gas flow path from the upper part of the scrap and exiting it from the lower part, that is, by heating the scrap so that the exhaust gas having a lowered temperature comes into contact with the damper. However, when the damper faces the reactor, it still receives heat from both sides, so the damage is not negligible. Including this point, the reactor iron making equipment has
It is required to be even more robust and have a long service life. Improving thermal efficiency is also a constant issue, and the shape must be such that heat loss is small. It is also important to ensure airtightness, because high-temperature combustion gas is constantly introduced into the heating shaft, so it is necessary to charge the raw material into the heating shaft while maintaining the airtight state. It is necessary to smoothly insert into the furnace while maintaining the state.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present inventors have responded to the above-mentioned demands, are easy to manufacture, have a long life, are convenient for operation and repair, have high utilization of heat, and are highly rationalized. We developed a reactor iron making device with the above structure and proposed it separately. It is an object of the present invention to provide a raw material supply method for heating a raw material and transferring it into the furnace body while maintaining the above-mentioned airtight state when carrying out reactor ironmaking using this proposed apparatus. is there. Structure of the invention

[Means for solving problems]

The structure of the main part of the improved reactor iron making apparatus related to raw material supply is shown in FIG.
Referring to this figure, the method for supplying a raw material for reactor iron making according to the present invention includes a furnace body 1 for melting the charged raw material, a heating shaft 3 for heating the raw material with combustion gas, and a heating shaft. Raw material buckets 4 for replenishing the raw material are arranged substantially vertically from below to above,
When melting scrap raw materials using a reactor iron-making device equipped with a gas combustion tower (not shown) for burning the gas from the furnace body to high temperature and using it for heating the raw materials, the following operations are performed. It is characterized by performing. B) The lower damper 23 of the raw material bucket 4 is closed, the upper lid 24 is opened, and a predetermined amount of raw material is loaded from the conveyor 6 into the bucket. B) The damper 22 below the heating shaft 3 is closed, the lid 24 of the bucket is closed, and the damper 24 is opened to drop the raw material CS in the bucket into the heating shaft 3. C) The damper 23 of the bucket is closed, and the combustion gas is introduced into the heating shaft 3 through the gas inlet 31 and exits through the outlet 32 to heat the raw material, while the lid 24 of the bucket is opened and the next raw material is charged. . D) The damper 22 of the heating shaft and the lid 21 on the upper part of the furnace body are opened, the heated raw material HS is charged into the furnace body 1, and the damper 22 of the heating shaft and the lid 21 of the furnace body are closed. Hereinafter, the above b), c) and d) are repeated.

[Action]

By supplying the raw material by operating the above-mentioned lid and damper, the raw material can be heated while maintaining the airtight state.

Embodiment

The lids 21 and 24 of the reactor iron making apparatus are preferably of a slide type as shown in the figure because they are compact, while the dampers 22 and 23 are preferably of the double-door type as shown because of the smooth operation. It is desirable that these dampers alleviate the drop impact that accompanies the charging of raw materials. For this purpose, it is convenient to employ a hydraulic mechanism that also serves as an opening / closing operation, as shown in FIGS. 2 and 3. In the illustrated example, the hydraulic cylinder 5 is used to open and close the damper 22 at the lower part of the heating shaft and absorb the shock. The hydraulic cylinder whose one end is fixed to the fulcrum 51 on the outer wall of the heating shaft is used when the damper is closed. Absorbs the impact of receiving the raw material at the position indicated by the solid line, and moves to the position indicated by the chain line when the damper is opened. The cooling water is circulated inside the damper by using the fixed shaft 221 and the movable shaft 222 of the damper. Passage 223 for axis of movement 222
Is covered with a cover plate (not shown) to maintain airtightness. What is to be charged as a melting raw material is scrap and a slag forming agent. There are many kinds of scraps, such as shredder, briquette, Koyama, Dalai, etc., which can be arbitrarily used. It is also possible to replace all or part with reduced iron. The slag-making agent is CaO and other
It is particularly preferable to use granular CaO. It is effective to achieve airtightness by charging granular CaO at the beginning of each raw material supply process so as to fill the gap between the dampers. EFFECTS OF THE INVENTION By carrying out the raw material supply method of the present invention, in a reactor ironmaking using a separately proposed highly streamlined structure apparatus, sufficient heating and smooth charging of raw materials can be performed while maintaining an airtight state. I can do it.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the main components of the reactor iron making apparatus. 2 and 3 are for explaining a means for opening and closing a damper and a shock absorbing means which is a part of the raw material supply mechanism of the present invention, FIG. 2 is a side view, and FIG. Second
It is a transverse cross-sectional view of FIG. 1 ... Furnace 21 ... Lid I 22 ... Damper I 23 ... Damper II 24 ... Lid II 3 ... Heating shaft 4 ... Raw material bucket 5 ... Hydraulic cylinder 6 ... Conveyor

Claims (3)

[Claims] 1. A furnace body for melting the charged raw material, a heating shaft for heating the raw material with combustion gas, and a raw material bucket for replenishing the heating shaft with the raw material are arranged substantially from the bottom to the top. The following operations are performed when melting scrap raw materials using a reactor iron-making device that is arranged vertically and is equipped with a gas combustion tower that is used to heat the raw materials by burning the gas from the furnace body to a high temperature. A raw material supply method characterized by the above. A) Close the damper at the bottom of the raw material bucket, open the top lid, and load a predetermined amount of raw material from the conveyor into the bucket. B) Close the damper at the bottom of the heating shaft and close the bucket lid. Open the damper to drop the raw material in the bucket into the heating shaft. C) Close the damper in the bucket and introduce the combustion gas into the heating shaft to heat the raw material, while opening the bucket lid to open the next Charge the raw material, d) Open the damper of the heating shaft and the lid on the upper part of the furnace body, and put the heated raw material into the furnace body, and close the damper of the heating shaft and the lid of the furnace body. Repeat steps c) and d). 2. The raw material supply method according to claim 1, wherein the damper is supported and opened / closed by a hydraulic cylinder mechanism. 3. The raw material supply method according to claim 1, wherein granular CaO is charged at the beginning of each raw material supply process.