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Process and equipment for preparing spongy iron by two-step reduction method

A process method, the technology of sponge iron, applied in the field of sponge iron production by two-step reduction method, can solve the problems of high production cost, poor product quality, waste of energy, etc., and achieve the effects of reduced production cost, less equipment required, and reduced pollution

Inactive Publication Date: 2004-07-28
雷少军
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The gas-based method is a process of reducing iron oxide in a reduction furnace after heating the reducing gas. The sponge iron produced by this method has a high metallization rate, which can reach more than 92%, but the disadvantage is that the investment is large and the reduced tail gas More than 50% of the effective gas is discharged, which not only wastes energy, but also causes environmental pollution; the coal-based method is to mix coal or coke with iron oxide ore in a container, and heat it externally to reduce it. method, the advantages of this method are small investment and quick results, but there are problems such as poor product quality, high production cost, and serious pollution.
The above-mentioned two beneficial methods all have the disadvantages of low energy utilization rate and pollution of the environment by tail gas emissions. Although some people use the waste gas generated in the reduction process to generate electricity, their thermal energy utilization rate is less than 10%, which has little practical significance and has not solved the problem of tail gas pollution. pollution problem
For example, Chinese patent 96190922 discloses an Austrian production method for sponge iron, the main content of which is to output CO in the tail gas of the reduction furnace 2 The gas is removed by pressure swing adsorption, and then used as a heat source to supply the heating device. The utilization rate of heat energy is low. In addition, corresponding equipment must be added to provide a certain amount of oxygen-containing gas. This method consumes a lot of power and the production higher cost

Method used

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  • Process and equipment for preparing spongy iron by two-step reduction method
  • Process and equipment for preparing spongy iron by two-step reduction method
  • Process and equipment for preparing spongy iron by two-step reduction method

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Experimental program
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Effect test

Embodiment 1

[0025] like figure 1 As shown, the present invention comprises two-step reduction reactions, one-step reduction reaction is carried out in reduction shaft furnace 2, two-step reduction reaction is carried out in heating reformer 1, one-step reduction reaction reduces iron oxide into metallic iron, and two-step reduction reaction will CO 2 Reduction to CO, as follows:

[0026] Before the entire system starts to operate, coke and / or coal with a fixed carbon content ≥ 80% are fed into the reduction chamber 20 of the heating reformer 1 through the feed port 13, and CO is charged into the system through the gas charging port 12 and the exhaust port 11. 2 , replace the air in the system, close the charging and exhaust ports 12, 11, open the valves 5, 6, 7, ignite and heat the combustion chamber 21 of the reformer 1, start the fan 3 and other equipment, and the system starts to cycle.

[0027] The reduction chamber 20 is heated to 900°C by the combustion chamber 21, and the CO in t...

Embodiment 2

[0035] like figure 2 As shown, in the system of Embodiment 1, the furnace top exhaust gas cleaner and the gas storage cabinet may not be provided. At this time, the furnace top exhaust gas output by the reduction shaft furnace 2 is divided into two paths after being output by the pipeline 26, and one path passes through the blower fan 3 Afterwards, it is sent into the reduction chamber 20 by the pipeline 9 for two-step reduction, and the reducing gas produced after the reduction reaction continues to participate in the gas cycle;

[0036] like image 3 As shown, the heating reformer 1 includes a gas reduction chamber 20 and a combustion chamber 21; the reduction chamber 20 is filled with coke and / or coal, has a gas input 24, an output port 23, and inlet and outlet ports 13, 14, and is hermetically sealed; The combustion chamber 21 has a top exhaust gas input port 22 and other fuel and oxygen-containing gas input ports 15 .

[0037]

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Abstract

A process and equipment for preparing spongy iron by two-step reduction method is disclosed. The tail gas is pumped from the top of vertical reducing furnace to transform heater, where the tail gas reacts on the solid carbon to obtain the reducing gas whose main component is CO and the excess gas. Said reducing gas is returned back to said vertical reducing furnace to form a circulation. Said excess gas can be used as fuel. Its advantages include full use of energy resource, less environmental pollution and low cost.

Description

technical field [0001] The invention relates to a process and equipment for producing sponge iron by a two-step reduction method. Background technique [0002] At present, the production methods of sponge iron can be roughly divided into two categories, namely gas-based method and coal-based method. The gas-based method is a process of reducing iron oxide in a reduction furnace after heating the reducing gas. The sponge iron produced by this method has a high metallization rate, which can reach more than 92%, but the disadvantage is that the investment is large and the reduced tail gas More than 50% of the effective gas is discharged, which not only wastes energy, but also causes environmental pollution; the coal-based method is to mix coal or coke with iron oxide ore in a container, and heat it externally to reduce it. method, the advantages of this method are small investment and quick results, but there are problems such as poor product quality, high production cost, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/14
Inventor 雷少军
Owner 雷少军