CN-224227105-U - Iron making system

CN224227105UCN 224227105 UCN224227105 UCN 224227105UCN-224227105-U

Abstract

The utility model relates to an iron-making system, which belongs to the technical field of smelting reduction furnaces. The iron ore powder preheating device comprises a furnace body, a scraper, a driving system and a driving device, wherein the furnace body is provided with a charging hole, a coal gas outlet, a coal gas inlet and a discharging hole, a plurality of trays are connected with the side wall of the furnace body, each tray is provided with a plurality of discharging holes, the scraper is provided with a scraper arm and a scraper, the scraper arm is connected with a rotating shaft, the scraper arm and the scraper rotate together with the rotating shaft, and the driving system is provided with the rotating shaft and the driving device. The method has the advantages that the high-temperature coal gas generated by the reduction furnace is used for preheating the iron ore powder, the utilization efficiency of the coal gas is improved, CO and H 2 in the coal gas and the iron ore powder undergo reduction reaction, the pre-reduction degree of the iron ore powder is improved, and the production efficiency of the smelting reduction furnace is improved.

Inventors

YU XINMIAO
JIA LIJUN
ZHAO SHIJIE
GUO CHUNLEI
YAO HANG
YU GUOHUA

Assignees

山东省冶金设计院股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250425

Claims (9)

1. The iron-smelting system is characterized by comprising an iron ore powder feeding device, an iron ore powder preheating device, an iron ore powder blowing device, a coal powder blowing system and a smelting reduction furnace, wherein the iron ore powder feeding device is connected with the iron ore powder preheating device, the iron ore powder preheating device is connected with the iron ore powder blowing device, the iron ore powder blowing device is connected with the smelting reduction furnace, the coal powder blowing system is connected with the smelting reduction furnace, and the smelting reduction furnace is connected with the iron ore powder preheating device; The iron ore powder preheating device comprises a furnace body, a scraping device, a driving system and a driving device, wherein the furnace body is of a barrel-shaped structure, a feeding hole is formed in the upper part and/or the top of the furnace body, a gas outlet is formed in the upper part and/or the top of the furnace body, a gas inlet is formed in the lower part and/or the bottom of the furnace body, a discharging hole is formed in the lower part and/or the bottom of the furnace body, a plurality of trays connected with the side wall of the furnace body are arranged, a plurality of chambers which are separated by the trays along the up-down direction are arranged, each tray is provided with a plurality of discharging holes, and the adjacent chambers are communicated through the discharging holes; The melting reduction furnace is provided with an oxygen-containing gas spray gun, a solid material spray gun, a forehearth, a slag hole and a reduction furnace gas outlet.
2. The iron making system as set forth in claim 1, wherein said shaft is hollow and is cooled by a cooling medium.
3. The iron making system as set forth in claim 1, wherein said tray is made of a refractory alloy, said tray having a wear-resistant material thereon and said tray having a feed opening therein.
4. The ironmaking system of claim 1, wherein the scraper arm and the scraper rotate with the shaft, the scraper scraping material on the tray.
5. The iron making system as set forth in claim 1, wherein said iron ore fines discharged from said discharge outlet are at a temperature of at least 600 ℃.
6. The iron making system as set forth in claim 1, wherein said gas produced in said smelting reduction furnace is introduced into said iron ore powder preheating device, and said gas after preheating the iron ore powder is discharged from said gas outlet.
7. The ironmaking system of claim 6, wherein the gas temperature is greater than or equal to 800 ℃.
8. The iron making system as set forth in claim 1, wherein said oxygen-containing gas lance blows oxygen-enriched air at a temperature of at least 1000 ℃.
9. The iron making system as set forth in claim 1, wherein said oxygen-containing gas lance blows oxygen having an oxygen content of 80% or more at room temperature.

Description

Iron making system Technical Field The utility model relates to an iron making system, which directly uses iron ore powder and coal dust to produce molten iron, and belongs to the technical field of smelting reduction furnaces. Background The said smelting reduction furnace is commonly referred to as Hismelt. The smelting reduction furnace directly adopts iron ore powder and coal powder for iron making, and the procedures of coking and sintering are omitted. The smelting reduction ironmaking directly sprays mineral powder and coal powder into a slag iron molten pool, reduction reaction is carried out in the molten pool to generate CO, rising CO in the molten pool, the iron powder and coal powder carrier gas are sprayed to bring slag iron drops into an upper space to form 'fountain' -shaped slag iron drops, rising CO gas and hot air sprayed by a hot air spray gun at the top are subjected to secondary combustion reaction to generate a large amount of heat, and the 'fountain' -shaped slag iron drops are heated to bring heat back to the molten pool. The operating pressure of the smelting reduction furnace is typically less than 100kPa. The iron ore powder sprayed into the smelting reduction furnace needs to be preheated and prereduced. The preheating of iron ore powder in the smelting reduction furnace adopts a circulating fluidized bed, a venturi tube and a cyclone process in Australia KWINANA, and the high-temperature gas generated by the smelting reduction furnace for the iron ore powder is preheated in the original plan due to the extremely high flow rate in the process, serious abrasion of refractory materials and short service life, but the gas of the smelting reduction furnace cannot be introduced into an iron ore powder preheating system even if the project is stopped. The iron ore powder of the smelting reduction furnace is preheated by adopting a rotary kiln drying and preheating process, and as the rotary kiln adopts negative pressure operation, a heat source for drying and preheating adopts pulverized coal combustion or gas combustion, and the rotary kiln cannot adopt high-temperature flue gas generated by the smelting reduction furnace for preheating. The iron ore powder preheating and prereduction process adopts a multistage fluidized bed process in the pump item FINEX, and the multistage fluidized bed process has the advantages of more equipment, high power required by fluidization, high resistance loss and higher fluidization air pressure than 300kPa during operation. Disclosure of Invention Solution to technical problems The iron-smelting system comprises an iron ore powder feeding device, an iron ore powder preheating device, an iron ore powder blowing device, a coal powder blowing system and a smelting reduction furnace, wherein the iron ore powder feeding device is connected with the iron ore powder preheating device, the iron ore powder preheating device is connected with the iron ore powder blowing device, the iron ore powder blowing device is connected with the smelting reduction furnace, the coal powder blowing device is connected with the smelting reduction furnace, and the smelting reduction furnace is connected with the iron ore powder preheating device; The iron ore powder preheating device comprises a furnace body, a scraper, a driving system, a rotating shaft and a driving device, wherein the furnace body is of a barrel-shaped structure, a charging hole is formed in the upper part and/or the top of the furnace body, a gas outlet is formed in the upper part and/or the top of the furnace body, a gas inlet is formed in the lower part and/or the bottom of the furnace body, a discharging hole is formed in the lower part and/or the bottom of the furnace body, a plurality of trays connected with the side wall of the furnace body are arranged, a plurality of chambers which are separated by the trays along the up-down direction are arranged, each tray is provided with a plurality of discharging holes, the adjacent chambers are communicated through the discharging holes; the inner side of the iron ore powder preheating device cylinder is provided with a heat insulation and wear-resistant material; the melting reduction furnace is provided with at least one iron ore powder preheating device; The melting reduction furnace is provided with an oxygen-containing gas spray gun, a solid material spray gun, a forehearth, a slag hole and a reduction furnace gas outlet, wherein the oxygen-containing gas spray gun is inserted into the upper part of the melting reduction furnace, the outlet is arranged above a slag layer, the solid material spray gun is inserted from the side wall of the melting reduction furnace, and the outlet is arranged in the slag layer. Preferably, the rotating speed of the rotating shaft is 0.4-4 r/min, the rotating speed is adjusted through the driving device, the residence time of the furnace burden in the iron ore powder preheating device is controlled through the adjustment o