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Pipeline type reduction gas charging device of gas-based vertical furnace and method utilizing pipeline type reduction gas charging device

A gas-based shaft furnace, pipeline-type technology, applied in the field of pipeline-type reducing gas into the furnace device, can solve the problems of high content, unfavorable sponge iron metallization rate, etc., to improve production efficiency, shorten gas-based reduction time, and convenient switching Effect

Active Publication Date: 2016-12-07
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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Problems solved by technology

However, in this process, the oxidizing component H contained in the medium reducing gas passed into the shaft furnace 2 O and CO 2 High content, greater than 10%, is not conducive to the improvement of the metallization rate of sponge iron in the shaft furnace, and high reducing gas is formed in the shaft furnace cavity, and it takes a long time for the reduction reaction to obtain a sponge iron product with a high metallization rate

Method used

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  • Pipeline type reduction gas charging device of gas-based vertical furnace and method utilizing pipeline type reduction gas charging device
  • Pipeline type reduction gas charging device of gas-based vertical furnace and method utilizing pipeline type reduction gas charging device

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Embodiment 1

[0037] The oxidized pellets with about 67% of the total iron are added from the top of the shaft furnace, and slowly move down until they are discharged from the bottom of the shaft furnace; during this period, the oxidized pellets are gradually reduced to full It is a sponge iron product with 91% iron and 94% metallization rate. About 1085°C, containing 23% CH4, 10.3% (H 2 O and CO 2 ), 64.7% (H 2 and CO) into the shaft furnace after being pre-reformed and transformed through the reduction gas inlet branch pipe filled with a large number of oxidized pellets; 67.3% oxidized pellets, the oxidized pellets are slowly reduced by a medium reducing gas, and a small amount of CH can be catalytically reformed when a small amount of metallic iron is generated 4 for H 2 And CO, after being reduced by a medium reducing gas for 9 hours, it can be reduced to a very high-quality sponge iron with a total iron of about 93% and a metallization rate of 99%. Catalytic reforming of the mediu...

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Abstract

The invention provides a pipeline type reduction gas charging device of a gas-based vertical furnace and a method utilizing the pipeline type reduction gas charging device. The pipeline type reduction gas charging device comprises a stuffing device, an unloading device, a valve group, gratings, a reduction gas main tube, two or more reduction gas branch tubes and oxidized pellets; one end of the reduction gas main tube is connected with the reduction gas branch tubes; the other end of the reduction gas main tube is connected with a plurality of reduction gas spray nozzles arranged in the gas-based vertical furnace; a pellet filling region is arranged in each reduction gas branch tube; oxidized pellets are filled in the pellet filling regions for carrying out catalytic reforming on reduction gas, so that high-reduction gas is obtained; and the stuffing device and the unloading device are positioned on corresponding positions of the pellet filling regions. In this device, medium-reduction gas in a furnace hearth is catalytically refined into high-reduction gas, so that the oxidized pellets in the furnace hearth of the vertical furnace are easily reduced into pellets with a high metallization ratio, and therefore, reduction reaction time is shortened, and production efficiency of the gas-based vertical furnace is improved; and moreover, oxidized pellet regions can be conveniently switched when effect is worsened or faults are caused, and therefore, stable and safe operation of the whole system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and ironmaking, and in particular relates to a pipeline-type reducing gas feeding device for a gas-based shaft furnace and a method for using the same. Background technique [0002] Direct reduced iron (DRI) is an iron-containing product obtained by direct reduction of iron ore below the melting temperature. Direct reduced iron has a stable chemical composition and low impurity content. It is one of the substitutes for scrap steel. It is an indispensable impurity diluent for electric furnace smelting pure steel and high-quality steel. It is a high-quality coolant for converter steelmaking. missing raw materials. In 2014, the output of direct reduced iron in the world reached 74.5 million tons, and direct reduction ironmaking has been listed as one of the main directions for the development of my country's iron and steel industry. The technical method of producing direct reduced iron in this f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/02
CPCC21B13/0073C21B13/02
Inventor 范志辉员晓邓君曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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