Double-shaft-furnace system and method for producing iron-containing products

A shaft furnace and product technology, applied in the field of metallurgy, can solve the problems of reducing the comprehensive utilization rate of reducing gas, increasing the requirements for preparing reducing gas, and high requirements for supporting equipment, so as to improve energy utilization rate, reduce equipment complexity, and reduce equipment investment. cost effect

Pending Publication Date: 2017-12-26
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] However, in the prior art, the requirements for reduction reaction conditions of vanadium-titanium magnetite are higher than those of iron ore concentrate, which causes a certain problem of energy utilization, and the relatively high top gas pressure has a great impact on the top gas system during the recycling process. Higher requirements for supporting equipment
[0005]

Method used

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  • Double-shaft-furnace system and method for producing iron-containing products

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] refer to figure 1 , the joint production system and method are specifically:

[0051] Put vanadium-titanium-magnetite pellets in the first shaft furnace 10, put iron concentrate pellets in the second shaft furnace 20, and mix fresh reducing gas and hydrogen-rich gas in the first mixing tank 11 to make the gas composition reach H 2 / CO ratio 5, effective reducing gas (H 2 +CO) volume ratio ≥ 0.95, the mixed gas is passed into the first compressor 12, so that the pressure of the mixed gas reaches 0.8MPa, then it is passed into the first heating furnace 13, and the mixed gas is transferred by the first heating furnace 13 The temperature is heated to 1100°C. React in the first shaft furnace 10 to produce vanadium-titanium sponge iron and obtain the first top gas. The main components of the first furnace top gas are hydrogen, carbon monoxide, water vapor generated by the reaction and a small amount of carbon dioxide generated by the reaction, and the first furnace top gas...

Embodiment 2

[0055] refer to figure 1 , the details of the joint production system and method are:

[0056] Put vanadium-titanium-magnetite pellets in the first shaft furnace 10, put iron concentrate pellets in the second shaft furnace 20, and mix fresh reducing gas and hydrogen-rich gas in the first mixing tank to make the gas composition reach H 2 / CO ratio 4, effective reducing gas (H 2 +CO) volume ratio ≥ 0.95, the mixed gas is passed into the first compressor 12 to make the pressure of the mixed gas reach 0.7MPa, and then it is passed into the first heating furnace 13, and the mixed gas is compressed by the first heating furnace 13 The temperature is heated to 1050° C., and the reaction is carried out in the first shaft furnace 10 to produce vanadium-titanium sponge iron and obtain the first top gas. The main components of the first furnace top gas are hydrogen, carbon monoxide, water vapor generated by the reaction and a small amount of carbon dioxide generated by the reaction, and...

Embodiment 3

[0060] refer to figure 1 , the details of the joint production system and method are:

[0061] Put vanadium-titanium-magnetite pellets in the first shaft furnace 10, put iron concentrate pellets in the second shaft furnace 20, and mix fresh reducing gas and hydrogen-rich gas in the first mixing tank 11 to make the gas composition reach H 2 / CO ratio 3, effective reducing gas (H 2 +CO) volume ratio ≥ 0.85, the mixed gas is passed into the first compressor 12, the pressure of the mixed gas reaches 0.65MPa, and it is passed into the first heating furnace 13, and the mixed gas is passed into the first heating furnace 13 by the first heating furnace The temperature is heated to 1000°C, and the reaction is carried out in the first shaft furnace 10 to produce vanadium-titanium sponge iron and obtain the first top gas. The main components of the first furnace top gas are hydrogen, carbon monoxide, water vapor generated by the reaction and a small amount of carbon dioxide generated b...

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Abstract

The invention discloses a double-shaft furnace system for producing iron-containing products, comprising: a first shaft furnace, a first heating furnace sequentially connected to the air inlet of the first shaft furnace through pipelines, a first compressor, and a second shaft furnace. A mixing tank; and a heat exchanger, a dehydrator, and a residual pressure power generation system sequentially connected to the first top gas outlet of the first shaft furnace; the second shaft furnace is connected to the second inlet of the second shaft furnace through pipelines; The second heating furnace, the second mixing tank and the residual pressure power generation system connected in sequence to the gas port; and the water washing tower and the hydrogen extraction device connected in sequence to the second top gas outlet of the second shaft furnace. The invention also discloses a method for producing iron-containing products using a double shaft furnace system. Through the use of the above-mentioned device and method, the efficient utilization of different iron ore reducing gas raw materials is realized, and on the basis of comprehensive optimization of the reaction system, the comprehensive utilization of resources and energy is achieved, and finally the comprehensive production of multi-metal products is realized.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a double shaft furnace system and method for producing iron-containing products. Background technique [0002] Gas-based shaft furnace direct reduction ironmaking is the most important non-blast furnace ironmaking method, and its product is direct reduced iron (also known as sponge iron), which is mainly used as raw material for electric furnace steelmaking, and can also be used as a coolant for converter steelmaking. At present, 80% of the total output of direct reduced iron in the world is produced by the gas-based shaft furnace method. At present, the most mature shaft furnace direct reduction ironmaking process is the MIDREX method and the HYL-III method. Both methods in the current equipment have a single shaft furnace with a capacity of more than 1 million tons in operation. Gas-based shaft furnace product sponge iron is a high-quality raw material for electric furnace ...

Claims

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Application Information

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IPC IPC(8): C21B13/02C21B13/14
CPCC21B13/02C21B13/0073C21B13/146
Inventor 刘亮邓君范志辉员晓唐敬坤冯鲁兴韩志彪吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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