JPS60234928A - Vertical sintering furnace - Google Patents

Abstract

PURPOSE:To improve the productivity by using molded starting materials and uniting a sintering apparatus, coolers, etc. to one body so as to make the facilities compact. CONSTITUTION:This vertical sintering furnace is provided with units 3, 4, 5, 6 for charging molded starting materials to be sintered at a position close to the top of the shaft furnace 8, inlets 15 for blowing gas at high temp., inlets 13 for blowing gas at low temp., and outlets 10 for discharging gas. The inlets 15, 13 are positioned at parts close to the center of the furnace 8 and at the bottom, respectively. The outlets 10 are positioned between the inlets 15, 13. Thus, the facilities are made compact and the productivity is improved.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention is directed to the production of sintered ore by integrating the two steps of sintering and cooling a sintered raw material formed in a molding machine in a shaft furnace. The present invention relates to vertical sintered pVC, which is characterized by a small equipment space and high productivity.

(Prior art) W $ trN+Tj) -1, -r r7J
k mouth j lj/nT) formula, Greenerwald (GW) formula,
There is an AiB type.

Among these, D, which can be adapted to the recent increase in size, has a simple charging and ignition mechanism, and is suitable for continuous mass production.
L-type sintering equipment is often used.

Figure 3 is an example of the flow of DL type sintering equipment ("Ironmaking and Steelmaking Method", Japan Iron and Steel Association, page 68).

Raw materials such as iron ore, coke, return powder, etc. are mixed in a specified ratio in a mixer 64, and then passed through charging devices such as a charging hopper 65 and a drum feeder, and then onto the holes 70 of a sintering machine 69. Charge. Next, the surface is ignited in an ignition furnace 66, the coke in the raw material is burned with suction air, and the ore is discharged from the end of the sintering machine. Further, −Next Crusher 7
4. Crush and sieve with Honto Grizzly-75, cooled with 76
The sintered ore is cooled and sent to the blast furnace as sintered ore suitable for use in the blast furnace.

(Problems with the conventional technology) The DL type sintering machine burns coke powder mixed into the raw material, and the generated heat promotes the sintering reaction and (semi) melting reaction between the raw material ore particles. The properties are limited by the combustion reaction rate.

The line speed and layer thickness of the sintering machine are variable factors in production volume, but productivity is low because the above-mentioned constraints must be satisfied in order to continue stable operation.

Furthermore, although there are types of coolers such as circular type and linear type, they are installed independently of the sintering machine, requiring a large installation space and resulting in low productivity.

Based on these factors, the productivity of conventional sintering equipment is 25 to 4
0'/rn'-day.

(Object of the Invention) In view of the above-mentioned problems, the present invention aims to provide a vertical sintering furnace that is compact and has high productivity.

(Structure of the Invention) The sintering furnace according to the present invention has a charging device for charging the molded sintering raw material near the top of the shaft furnace, and a high-temperature gas inlet for sintering near the center of the shaft furnace body. This is a vertical sintering furnace characterized in that a low-temperature gas inlet for cooling is formed in the lower part of the shaft furnace body, and a gas outlet is formed in the middle part between the two inlets.

Hereinafter, a detailed description will be given based on the accompanying drawings.

FIG. 1 is a sectional view of the vertical sintering furnace of the present invention.

First, various raw materials such as iron ore, return powder, and limestone are mixed with a binder (Oak, bentonite, cement, sulfite pulp waste liquid, etc.) in a specified ratio in a mixer. After the mixed and granulated material is formed into a predetermined shape and size using a molding machine, it is sent by a charging conveyor 1 to a collection of hot springs 2 installed in the upper part of the shaft furnace.

The molding size in the molding machine can be any size, but it must be easy to handle, easy to use as a raw material for blast furnaces, and unlikely to cause nogging or welding in the shaft furnace (does not significantly increase ventilation resistance). 20 to 50 a is preferable.

The raw material supplied to the collecting hole ξ- passes through the raw material supply device (feeder 3, weighing pumper 4, cut gate 5, gas seal valve 6) and is charged into the upper part of the shaft furnace 8 through the chute 7.

The shape of the shaft furnace may be circular or rectangular in cross section.

The hot air generated by the hot air generator is blown into the shaft furnace through the annular pipe 16 and the hot air tuyere 15 against the raw material charged into the shaft furnace. The charged raw materials are preheated and sintered by this hot air. The hot air is supplied at a temperature above about 1300'C, which is the temperature required for sintering.

The hot air heat-exchanged by preheating and sintering the raw materials has a low temperature, and is guided to the outside of the shaft furnace through the exhaust gas duct 11.

The sintered ore is preheated and sintered in the preheating zone and sintering zone in the upper part of the shaft furnace, and then moves down through the furnace to the cooling zone.

The cold air necessary for cooling the sintered ore enters the furnace through the shaft furnace lower hopper 14 through a cold air blower, a cold air header 12, and a cold air blowing hole 13, and as it rises, it exchanges heat with the high-temperature sintered ore. , the sintered ore is cooled to a predetermined temperature. The air after heat exchange is guided from the exhaust hole 10 through the exhaust pipe 9 to the outside of the shaft furnace.

By making the upper part of the shaft furnace the sintering zone and the lower part the cooling zone, it becomes possible to perform sintering and cooling in a single shaft furnace.

After sintering, the cooled sintered ore is transported by a discharge conveyor 23 via a lower discharge device (discharge chute 17, cut gate 18, gas seal valve 19, storage tank 20, cut gate 21, seal valve 22). Ru.

FIG. 2 is a diagram showing an example of the overall flow when using the vertical sintering furnace according to the present invention. 31 is a raw material tank, 32 is a cutting device, 33 is a raw material conveyor, 34 is a kneading machine supply device, 35 is a kneading machine, 36 is a molding machine, 37 is a drying device,
38 is the forming raw material HONNO e-139 is the charging conveyor, 4
0 is a shaft furnace charging device, 41 is a shaft furnace main body, 42
43 is a shaft furnace discharge device, 43 is a discharge conveyor, 44 is a cold air blower, 145 is a cold air blowing header, 46 is an exhaust pipe, 47 is a hot air annular pipe, 48 is an exhaust pipe, 49 is a fuel pressure booster blower for hot air generation 150 is Boosting blower for hot air generation-1
51 is a heat exchanger, 52 is a hot air generator, 53 is a dust collector,
54 is an exhaust fan, and 55 is a diffusion tube.

(Operations and Effects of the Invention) According to the present invention, in the production of sintered ore, shaped raw materials are used, and a vertical sintering furnace with a shaft furnace structure in which a conventional sintering machine and a cooling machine are integrated is used. This makes it possible to downsize the equipment and achieve high productivity.

According to the present invention, the cross-sectional productivity is 200-300'An'
・It is expected to be a dramatic improvement over conventional equipment. -): In addition, the equipment space can be significantly reduced compared to the conventional type where the sintering machine and cooling machine are installed independently. Furthermore, although conventional equipment mixes coke into the raw material, there is no need to mix coke in the present invention. Therefore, the Na equipment required in conventional equipment can be omitted.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the vertical sintering furnace of the present invention, Figure 2 is a diagram showing an example of the overall flow when the vertical sintering furnace of the present invention is used, and Figure 3 is a diagram showing the conventional sintering furnace. It is a figure showing an example of the flow of equipment. 3, 4, '5, 6... Raw material supply device, 8
...... / Yaft furnace, 10 ... Exhaust hole, 1
3...Cold air blowing hole, 15...Hot air tuyere. Agent: Patent attorney Masamitsu Akizawa and 2 others

Claims (1)

[Claims] m A charging device for the formed sintered raw material is formed near the top of the shaft furnace, and a high-temperature gas inlet for calcination is installed near the medium heat part of the shaft furnace main body, and a low-temperature gas inlet for cooling is installed at the bottom of the shaft furnace main body. A vertical sintering furnace characterized in that a gas inlet and a gas outlet are formed at an intermediate portion between the two inlets.