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Gas-based shaft kiln and method for producing direct reduction iron

A gas-based shaft furnace and reducing iron technology, which is applied to shaft furnaces, furnaces, furnace types, etc., can solve the problems of reducing the quality of the top gas and reducing gas of the shaft furnace, wasting heat, endangering personal safety, etc., and improving production efficiency. And the effect of energy utilization rate, recycling ratio improvement, and quality improvement

Inactive Publication Date: 2017-06-13
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of the gas sealing system is that if the sealing gas pressure is high, it will easily cause a large amount of sealing gas to enter the shaft furnace, reducing the quality of the top gas and reducing gas in the shaft furnace; if the sealing gas pressure is low, it will easily lead to A large amount of gas escapes, endangering personal safety
[0004] In actual production, the gas-based shaft furnace feeding system can use N-rich 2 Dynamic sealing of reformer exhaust gas will result in 10-20Nm 3 N of / DRI 2 Enriched into the top gas of the shaft furnace, so that the proportion of the top gas circulation cannot be too high, only about 67%, otherwise the ineffective component N in the reducing gas 2 The content is too high, which reduces the production efficiency of the shaft furnace and wastes heat

Method used

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  • Gas-based shaft kiln and method for producing direct reduction iron

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] After the oxidized pellets with a total iron grade of 67% enter the hopper, they slowly move down through the slender feeding channel and enter the furnace body, and are gradually reduced to qualified direct reduced iron products by the reducing gas in the gas-based shaft furnace. Base shaft furnace.

[0054] In order to prevent the top gas (rich in CO and H 2 ) escape and seal the N in the gas 2 A large amount of ingredients are mixed into the shaft furnace, and there are two sets of sealing systems in the feeding channel from top to bottom—the first gas sealer and the second gas sealer. The first sealing gas is the combustion flue gas of the reforming converter, the gas volume is 60Nm 3 / DRI, the second sealing gas is CO obtained from decarburization of the mixed gas 2 The content is about 99% of the bleed gas, and the gas volume is 15Nm 3 / DRI. The pressure of the second sealing gas is about 450Pa higher than the pressure in the furnace at the sealing point, and...

Embodiment 2

[0058] After the oxidized pellets with a total iron grade of 67% enter the feeding device, they slowly move down through the slender feeding channel and enter the gas-based shaft furnace, where they are gradually reduced by the reducing gas into qualified direct reduced iron. The product exits the gas-based shaft furnace.

[0059] In order to prevent the top gas (rich in CO and H 2 ) escape and seal the N in the gas 2 A large amount of ingredients are mixed into the shaft furnace, and there are two sets of sealing systems in the feeding channel from top to bottom—the first gas sealer and the second gas sealer. The first sealing gas is the combustion flue gas of the reforming converter, the gas volume is 65Nm 3 / DRI, the second sealing gas is CO obtained from decarburization of furnace top gas 2 The content is about 99% of the bleed gas, and the gas volume is 13Nm 3 / DRI. The pressure of the second sealing gas is about 550 Pa higher than the pressure in the furnace at the ...

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Abstract

The invention discloses a gas-based shaft kiln and a method for producing a direct reduction iron. The gas-based shaft kiln comprises a kiln body, a feed channel, a first gas sealer, a second gas sealer and a gas processing device used for removing CO2 in a mixed gas; a feed outlet of the feed channel is connected with a feed inlet of the kiln body, a mixed gas outlet of the kiln body is connected with a mixed gas inlet of the gas processing device, and a reduction gas outlet of the gas processing device is connected with a reduction gas inlet of the kiln body. The gas-based shaft kiln adopts double-gas dynamic sealing, so that the top gas is guaranteed not to escape, the high quality of the top gas is also guaranteed, and the production rate and the energy utilization rate of the gas-based shaft kiln are improved.

Description

technical field [0001] The invention belongs to the technical field of sealing equipment, and in particular relates to a gas-based shaft furnace in which two gases are simultaneously used for sealing and a method for producing direct reduced iron. Background technique [0002] Direct reduced iron (DRI), also known as sponge iron, is an iron-containing product obtained by direct reduction of iron ore below the melting temperature. Sponge iron is a substitute for scrap steel, an indispensable impurity diluent for electric furnace smelting of pure and high-quality steel, a high-quality coolant for converter steelmaking, and an indispensable raw material for the development of short iron and steel metallurgy processes. In 2014, the world's annual output of direct reduced iron reached 74.5 million tons, a record high. my country has listed the direct reduction process as one of the main directions for the development of the iron and steel industry. [0003] The process of produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02
CPCY02P10/122C21B13/02C21B13/0073
Inventor 范志辉员晓刘亮曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST