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Method and device for ironmaking by smelting

A heat exchange device and a three-step technology, applied in the direction of fluidized bed furnace, etc., can solve the problems of insufficient utilization of heat energy, unused gas recycling, and low production efficiency, so as to achieve full utilization of heat energy, energy saving, and high production efficiency Effect

Active Publication Date: 2010-06-09
SHIJIAZHUANG XINHUA IND FURNACE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention patent still has its defects, such as the device is not equipped with a gas treatment device, the gas is not recycled, there is no heat exchange equipment, the heat energy cannot be fully utilized, the energy consumption is high, and the production efficiency of the final reduction single furnace operation is low

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  • Method and device for ironmaking by smelting
  • Method and device for ironmaking by smelting
  • Method and device for ironmaking by smelting

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Embodiment 1

[0022] The smelting reduction ironmaking device of the present invention is as figure 1 As shown, it includes a pre-reduction furnace 2, a gas treatment device 3, two final reduction furnaces 6, and a high-temperature heat exchange device 9. The pre-reduction furnace is a shaft furnace, and a feeding device 1 is arranged on the top of the pre-reduction furnace. The final reduction furnace is a sealed electric heating furnace (such as an induction heating furnace). There are electric heating facilities 7 around the furnace body. There are molten iron outlets 11 on the side of the furnace body. There are nozzles 13 on the upper part of the furnace body for injecting fuel. A screw conveyor 4 is provided between the pre-reduction furnace and the final reduction furnace, which is the passage for the products of the pre-reduction furnace to enter the final reduction furnace. The air intake pipe 5 is a gas channel through which the final reduction furnace gas enters the pre-reductio...

Embodiment 2

[0028] Another scheme of the present invention takes iron oxide (hematite or magnetite) as raw material, iron oxide ore is ground into ore powder and is made as Figure 6 The honeycomb-shaped non-carbon-containing molded object 35 shown is smelted and reduced in a smelting reduction device to produce molten iron or direct reduction molten steel. The smelting reduction device includes a pre-reduction furnace, a gas treatment device, two final reduction furnaces, and a high-temperature heat exchange device. Among them, the pre-reduction furnace is a shaft furnace, the final reduction furnace is an electric arc furnace 24, and the high-temperature heat exchange device is a regenerative heater 29

[0029] Such as image 3 As shown, the electric arc furnace includes a furnace body 24, a graphite electrode 25, a gas inlet 30 at the bottom of the electric arc furnace, and a molten iron outlet 11 on the side wall. The upper part of the electric arc furnace has a gas outlet 12 and a ...

Embodiment 3

[0034] Another solution of the present invention includes a pre-reduction furnace, a gas treatment device, a final reduction furnace and a high-temperature heat exchange device. The pre-reduction furnace is a shaft furnace, the high-temperature heat exchange device is a molten pool heating furnace, and the final reduction furnace is an electroslag furnace.

[0035] The molten pool is a body of furnace with molten iron, and its bottom or side wall is equipped with a spout 33. The molten pool heating furnace is airtightly connected with the final reduction furnace to isolate the air. The precipitated gas enters the molten iron pool from the nozzle, is heated to a high temperature, and then enters the final reduction furnace to be used as a heat carrier, protective gas or reducing agent. The molten pool heating furnace can be heated by electric heating, electric arc furnace, induction furnace, electroslag furnace or plasma furnace, and this embodiment is electric heating. Such a...

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Abstract

The invention relates to a method and a device for ironmaking by smelting reduction. Natural lump ore or artificial lump ore is taken as a raw material, coal gas produced during reduction is taken as a reducer and a heat carrier, and the raw material reacts through a pre-reduction furnace and then enters final reduction furnaces for a final reduction reaction. Liberated gas which comes out of the upper part of the pre-reduction furnace is treated through a gas processing device and is heated by a high-temperature heat exchange device and then enters the final reduction furnaces. The device for ironmaking by smelting reduction comprises the pre-reduction furnace, the gas processing device and at least one final reduction furnace. The method and the device have reasonable operation flow, fully utilize afterheat, and save energy sources; the method and the device use the two final reduction furnaces for alternate operation, have high production efficiency, and can perform continuous and mass production; and coal gas saved during production provides a raw material to other processes using the coal gas.

Description

technical field [0001] The invention relates to a method and device for smelting reduction ironmaking, in particular to a method and device for directly producing molten iron by smelting reduction of natural ore or artificial lump iron ore as raw material. Background technique [0002] Smelting reduction ironmaking is an important part of current steel production. Its main feature is to use non-coking coal as a primary energy source and reducing agent to reduce iron oxide in a molten state. It has the advantages of using coal instead of coke, short process, and less environmental pollution. , low construction investment, low production cost and other advantages, it is widely optimistic about the field in the industry, and iron and steel enterprises in various countries are competing to carry out research and development. The existing smelting reduction ironmaking methods mainly include COREX method (CN1010323B), DIOS method (CN1035136A), and HISELT method (CN1037542A). Amon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00
Inventor 贾会平
Owner SHIJIAZHUANG XINHUA IND FURNACE CO LTD
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