JPS63176406A - Reactor iron making device - Google Patents

Abstract

PURPOSE:To melt scrap with high thermal efficiency by preheating the scrap by the combustion heat of a CO-contg. exhaust gas at the time of smelting and refining the scrap by charging the preheated scrap into a furnace body having tuyeres in the upper and lower part and blowing gaseous O2 and carbon material therein. CONSTITUTION:The tiltable furnace body 1 is so constructed that said body can be moved to the positions right under a heating shaft 3 and right under a hood 6 connecting to a combustion column 5. The scrap HS preheated to a high temp. in the shaft 3 is dropped into the remaining molten metal in the furnace by moving the furnace body 1 to the position right under the shaft 3 and opening a slide damper 2. The furnace body 1 is moved to the position right under the hood 6 and the slide damper 2 of the shaft 3 is closed to put the cold charge CS of the scrap from a raw material bucket 4 into the shaft 3. The gaseous O2 is blown from the tuyere 11 of the furnace and the carbon material from the tuyere 12 into the furnace and the scrap HS is melted by the combustion heat of the carbon material. The CO-contg. exhaust gas generated at this time is burned in the combustion column 5 by the air from an intake 51 to form high-temp. exhaust gas. The cold charge CS of the scrap in the heating shaft is heated by said gas.

Description

[Detailed description of the invention]

Oiribe Danoi

[Industrial application field]

The present invention relates to improvements in reactor steelmaking equipment and provides a highly streamlined equipment configuration.

[Conventional technology]

The inventors first developed a technology for manufacturing iron (which includes pig iron and steel) by melting scrap, using carbonaceous materials and oxygen gas, without using electricity or coke. This was established and was already proposed under the name ``Reactor Iron Manufacturing Method'' (Special Publication No. 44363, 1983). Although this iron manufacturing method can use not only scrap but also reduced iron as a raw material, we have determined the optimal operating conditions when using reduced iron and have also disclosed them (JP-A-60-181213). . The basic method of "reactor iron manufacturing" is to store molten iron (hereinafter referred to as "molten iron") in a reactor with a space left at the top.
Scrap and carbonaceous material are charged into the reactor, oxygen gas is blown into the molten iron to stir the molten metal, and the carbonaceous material is oxidized mainly to CO. Blow in oxygen gas and remove the above CO
The gas is oxidized to CO2, the heat generated by the oxidation melts the charged scrap, and the high temperature exhaust gas is used to preheat the scrap to be charged. In a later improved process, the oxidation of co to CO2 is carried out outside the reactor. Regarding the equipment used in "reactor steel making", the basic one is disclosed in the above-mentioned Japanese Patent Publication No. 59-44363, and the improved equipment is disclosed in Japanese Patent Application Publication Nos. 58-199809 and 59-15.
No. 0005 and Japanese Patent Application Laid-open No. 15906/1983. In the early improved equipment, a scrap preheating shaft was placed directly above the reactor, and a damper was installed at the bottom of the shaft, which was closed during preheating to hold the scrap, and opened during charging to allow the scrap to fall directly into the reactor. This allows for reliable charging regardless of the shape or size of the container. Cooling water is passed through the damper to prevent burnout, but the problem is that it is exposed to high-temperature exhaust gas and has a short lifespan. In the next improvement, the exhaust gas flow path was introduced from the top of the scrap and exited from the bottom. In this type, the gas coming out of the furnace body is led to a combustion tower separate from the shaft, where air is introduced, and the temperature is increased by burning CO to CO2, which is then used for scrap heating. In other words, the scrap was heated so that the cooled exhaust gas came into contact with the damper, thereby reducing burnout. However, if the damper faces the reactor, it will still receive heat from both sides, so damage cannot be ignored. Therefore, in subsequent improvements, a scrap retaining damper for the preheating shaft and a damper for the lid of the reactor were prepared separately to reduce damage caused by heat. However, because the exit of the combustion gases from the furnace body is necessarily located relatively low, usually above the highest level of the molten metal, slag foam can enter into it and sometimes become entrained in the combustion gases. It has been experienced that it has reached the point of burning towers. In addition to improving these points, reactor steelmaking equipment is required to further streamline the arrangement of each part. Improving thermal efficiency must also be constantly pursued, and efforts must be made to ensure a shape with low heat loss and airtightness.

[Problems to be solved by the invention]

In view of the above-mentioned technical problems, the object of the present invention is to provide a reactor with a highly streamlined structure that is easy to manufacture, has a long service life, is convenient for operation and repair, and has a high degree of heat utilization. Our goal is to provide steel manufacturing equipment. R1 Rigume

[Means to solve the problem]

As shown in FIGS. 1 and 2, the reactor iron making apparatus of the present invention has a combustion gas inlet 31 at the top, a combustion gas outlet at the bottom, and a lid 21 that opens when melted raw materials are introduced. , a heating shaft 3 for holding the raw material to be fed into the furnace body and heating it with the heat of combustion gas, and for intermittently introducing the heated raw material into the furnace body 1; a heating shaft 3 for blowing carbonaceous powder and oxygen gas; Furnace body 1 having tuyere 11, 12,
and a gas combustion tower 5 having an air intake 51 and connected to the combustion gas inlet 31 of the heating shaft 3 at the upper part, and a reactor steel making apparatus comprising a raw material bucket 4 provided directly above the heating shaft 3. In,
A gas combustion tower 5- is placed near the heating shaft 3, and the furnace body 1 is provided so as to be able to reciprocate between directly below the heating shaft 3 and directly below the gas combustion tower 5. For tapping, a spout 13 may be provided on the side surface of the furnace body 1, and the furnace body 1 may be tilted during tapping. It is preferable to provide a hood at the bottom of the combustion tower that can be raised and lowered in a certain range as shown in the figure to maintain airtightness with the furnace body.

[For use]

As shown in FIG. 1, the operation of this reactor iron manufacturing equipment begins by placing a carbonaceous material on a carrier gas from the lower shell opening 12 against the molten iron in the furnace body 1 placed directly below the gas combustion tower 5. Oxygen gas is blown in from the soil tuyere 11. C
The combustion of C generates heat and melts the input raw materials, causing C
Gas containing O is released. When this gas is led to the gas combustion tower 5 directly above and air is blown into it through the air intake port 51,
CO burns to become CO2, which increases the temperature of the gas, which is introduced into the heating shaft 3 through the combustion gas inlet 31 to heat the scrap inside the shaft. The gas that has heated the scrap is sent from the exhaust duct 32 to the dust collector via the gas cooler. To feed the heated scrap 1-18 to the furnace body,
As shown in FIG. 2, the furnace body 1 is moved directly below the heating shaft 3, and the lid 21 (slide damper) is opened. After charging, the lid 2 is closed, and the unheated scrap C8 prepared in the raw material bucket 4 is dropped into the heating shaft 3 by opening the damper 41. Replenishment of unheated scrap O8 to the raw material bucket 4 is performed from the top by opening 142. The hood 6, which moves up and down, is raised so as not to obstruct the movement of the furnace body, and lowered when the furnace body 1 is placed directly under the gas combustion tower 5 to maintain airtightness. In this way, by melting scrap and heating raw materials while maintaining airtightness, heat utilization is increased. M2 of the heating shaft 3 is not directly exposed to the high temperature gas of the reactor and has a long life without being burned out. By adopting the above-described structure of the plate 54, it is possible to realize a reactor iron making device with low heat loss and long life. This equipment is easy to construct and repair, which also makes reactor steelmaking an advantageous practice.

[Brief explanation of the drawing]

Both drawings are longitudinal cross-sectional views of essential parts of an example of the reactor steelmaking apparatus of the present invention for explaining its operation, and FIG. 1 shows the state in operation with the furnace body placed directly below the gas combustion tower. 2 shows a state in which the furnace body is moved directly below the heating shaft and heated scrap H3 is being supplied into the furnace. 1... Furnace body 2... Lid 3... Heating shaft 31... Combustion gas population 4
... Raw material bucket 5 ... Gas combustion tower 51 ... Air intake port 6.
... Lifting hood C8 ... Unheated scrap H3 ... Heated scrap Patent applicant Daido Steel Co., Ltd. Agent Patent attorney Souo Suga Figure 1 Figure 2

Claims (3)

[Claims] (1) It has a combustion gas inlet at the top and a combustion gas outlet at the bottom, as well as a lid that opens when melting raw materials are introduced, holding the raw materials to be introduced into the furnace body and heating them with the heat of the combustion gas. The heating shaft has a heating shaft for intermittently charging heated raw materials into the furnace body, a furnace body having tuyeres for blowing carbonaceous powder and oxygen gas, and an air intake port, and a heating shaft in the upper part. In a reactor steelmaking device that essentially consists of a gas combustion tower connected to a combustion gas inlet and a raw material bucket provided directly above a heating shaft, the gas combustion tower is placed next to the heating shaft, and the furnace body is connected to the gas combustion tower. A reactor iron making device characterized in that it is provided so as to be able to reciprocate between directly below the heating shaft and directly below the heating shaft. (2) The apparatus according to claim 1, wherein a spout for tapping the melt is provided on the side surface of the furnace body, and the furnace body is configured to tilt during tapping. (3) The device according to claim 1, which is provided with a hood that moves up and down at the bottom of the gas combustion tower.