Furnace-inside modification method of furnace gas in Hismelt smelting reduction furnace and smelting reduction furnace thereof

A reduction furnace and furnace gas technology, applied in the field of Hismelt smelting reduction, can solve the problems of low calorific value of the pre-reduction tail gas, reduce the productivity of the reduction furnace, and be difficult to use economically, so as to achieve economical and high-efficiency utilization, and improve the reduction capacity. , Improve the effect of pre-reduction degree

Inactive Publication Date: 2013-12-18
SHANDONG PROVINCE METALLURGICAL ENG CO LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0005] 1. Since the Hismelt method has a higher secondary combustion rate, the concentration of carbon monoxide in the furnace gas discharged outside the reduction furnace is low and the concentration of carbon dioxide is high, so: when it is used for pre-reduction, its reducing ability is low , so that the pre-reduction degree of iron-containing raw materials can only be maintained at a low level, thus reducing the productivity of the reduction furnace; in the pre-reduction process, due to the further consumption of carbon monoxide, the calorific value of the pre-reduction tail gas will be reduced It becomes very low, it is difficult to use economically, and if it is released, it will cause environmental pollution
[0006] 2. The temperature of the exhaust gas outside the reduction furnace is very high, and technical measures such as water-cooled flue are required. Although part of the heat is recovered in form, this indirect heat recovery method is inefficient

Method used

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  • Furnace-inside modification method of furnace gas in Hismelt smelting reduction furnace and smelting reduction furnace thereof
  • Furnace-inside modification method of furnace gas in Hismelt smelting reduction furnace and smelting reduction furnace thereof
  • Furnace-inside modification method of furnace gas in Hismelt smelting reduction furnace and smelting reduction furnace thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1, such as figure 1 with figure 2 shown.

[0029] exist figure 1 with figure 2 Among them, 1 represents the furnace shell and cooling wall of the smelting reduction furnace. 2 indicates the entrance of coal for smelting, which sprays coal into the molten pool 3 by blowing, and vigorously stirs the molten pool 3; in the molten pool 3, it includes the violently stirred slag layer 3.1 and molten iron Layer 3.2.4 is the entrance of the iron-containing raw material, which also sprays the iron-containing raw material into the molten pool 3 by means of blowing, and vigorously stirs the molten pool 3. 5 represents the slag outlet. 6 represents the tap hole. 7 represents the entrance of combustion-supporting gas. 8 represents the outlet of furnace gas. 9 denotes a spray gun for spraying pulverized coal into the space above the slag layer in the smelting reduction furnace. 10 represents the approximate range of the secondary combustion zone in the smelting redu...

Embodiment 2

[0032] Example 2, such as image 3 with Figure 4 shown.

[0033] This embodiment has been changed on the basis of Embodiment 1: the spray gun 9 is moved up moderately, so that the pulverized coal spray gun 9 faces the non-combustion zone 12 of the furnace gas, and the size of the base circle 11 is adjusted, as a pulverized coal The standard of the spray gun 9 tangential configuration; at the same time, the quantity of the spray gun 9 is increased from 2 to 4 and so on. In fact, there may be more or less options for selecting the number of spray guns, so details will not be repeated here.

[0034] For the rest, refer to the relevant description of Embodiment 1.

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Abstract

The invention discloses a furnace-inside modification method of furnace gas in a Hismelt smelting reduction furnace and a smelting reduction furnace thereof, and belongs to the technical field of Hismelt smelting reduction. The invention aims to solve the main technical problems of improving quality of furnace gas in a Hismelt smelting reduction furnace, reducing ability, using economy, and productivity of a Hismelt smelting reduction furnace. The basic technical characteristic of the furnace-inside modification method of furnace gas in a Hismelt smelting reduction furnace and the smelting reduction furnace thereof is that: coal powder is sprayed into the space above the slag layer in a smelting reduction furnace through a nozzle. The furnace-inside modification method of furnace gas in a Hismelt smelting reduction furnace and the smelting reduction furnace thereof are suitable for a technical system of Hismelt smelting reduction.

Description

technical field [0001] The invention relates to a furnace gas reforming method of a Hismelt smelting reduction furnace and the smelting reduction furnace thereof, belonging to the technical field of Hismelt smelting reduction. Background technique [0002] The Hismelt method was developed from the OBM converter steelmaking process of the Klockner company in Germany. Based on the OBM converter process, the process improves the furnace body design and injection technology to achieve a higher secondary combustion rate and secondary combustion heat transfer efficiency. The molten pool part is like a converter, with nitrogen and natural gas as the carrier, spraying coal to the molten pool through the bottom or upper nozzle, the carbon in the coal is quickly dissolved into the molten iron and reduces the iron oxide in the slag, and the carbon monoxide and Oxygen in the combustion-supporting air entering the smelting reduction furnace at the top is used for secondary combustion. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/14
Inventor 姚朝胜于国华钱纲
Owner SHANDONG PROVINCE METALLURGICAL ENG CO LTD
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