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Oxygen supply system, oxygen supply method and control method of oxygen-enriched blast furnace

An oxygen supply system and blast furnace technology, applied in blast furnaces, blast furnace details, blast furnace parts, etc., can solve the problems of oxygen supply system pressure, flow instability, low oxygen enrichment rate, and limited oxygen enrichment capacity.

Active Publication Date: 2022-04-19
XINJIANG BAYI IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]At present, the mainstream oxygen enrichment technology for blast furnaces is to incorporate the oxygen delivery pipe into the hot air pipe, and the oxygen is sent to the blast furnace from the tuyere air supply device along with the hot air, and the air supply device does not have The ability to send gas, oxygen, hot air, pulverized coal, nitrogen and other media in parallel. This way of sending oxygen, the pressure and flow of the oxygen delivery system are extremely unstable, and the oxygen enrichment capacity is limited. The traditional blast furnace oxygen enrichment technology The oxygen enrichment rate of the blast furnace is generally between 3-5%. The oxygen enrichment rate is relatively low, and due to the combustion-supporting property of oxygen, it is easy to react with the gas in the blast furnace. , the oxygen supply system is slightly improperly operated, and it is easy to cause various safety accidents

Method used

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  • Oxygen supply system, oxygen supply method and control method of oxygen-enriched blast furnace

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Effect test

Embodiment 1

[0026] See Figure 1 , the present embodiment provides an oxygen-enriched blast furnace oxygen supply system, comprising a primary pressure control valve table, a secondary double-wire control valve platform, a security emergency control system and a mixed injection air outlet device, a primary pressure stabilization control valve table and a secondary double-wire control valve table in series, a primary pressure control valve table comprising a front oxygen main tube, the front oxygen main pipe is provided with an oxygen pressure regulating valve PCV121 and an oxygen globe valve FT121, and a secondary double-wire control valve includes a first oxygen branch and a second oxygen branch, The first oxygen branch and the second oxygen branch are connected in parallel, the first oxygen branch is provided with oxygen flow control valve FCV122 and oxygen fast cutting valve ZY122, the second oxygen branch is provided with oxygen flow control valve FCV123 and oxygen fast cutting valve ZY1...

Embodiment 2

[0030] The present embodiment provides an oxygen enrichment blast furnace oxygen supply method, comprising the following steps:

[0031] (1) Set the nitrogen pressure target value, open the nitrogen cut-off valve PT141, the nitrogen pressure regulating valve PCV201 is in the automatic state, and start automatically tracking the set pressure target value, set the oxygen pressure target value, open the oxygen globe valve FT121, the oxygen pressure regulating valve PCV121 in the automatic state and start the automatic tracking to set the pressure target value;

[0032] (2) Open the nitrogen globe valve ZY141, nitrogen flow control valve FCV141 preset opening of 20%;

[0033] (3) After 30 seconds, open the oxygen fast cutting valve ZY122, the oxygen flow control valve FCV122 starts the action, and after the opening degree of 5%, it begins to track the set oxygen enrichment rate flow, and gradually introduces oxygen into the blast furnace;

[0034] (4) After 5 minutes, the oxygen flow ...

Embodiment 3

[0036] The present embodiment provides an oxygen enrichment blast furnace oxygen supply method, comprising the following steps:

[0037] (1) Set the nitrogen pressure target value, open the nitrogen cut-off valve PT141, the nitrogen pressure regulating valve PCV201 is in the automatic state, and start automatically tracking the set pressure target value, set the oxygen pressure target value, open the oxygen globe valve FT121, the oxygen pressure regulating valve PCV121 in the automatic state and start the automatic tracking to set the pressure target value;

[0038] (2) Open the nitrogen globe valve ZY141, nitrogen flow control valve FCV141 preset opening of 20%;

[0039] (3) After 60 seconds, open the oxygen fast cutting valve ZY123, the oxygen flow control valve FCV123 action, the starting degree of 5% after the start to track the set oxygen enrichment rate flow;

[0040] (4) After 4 minutes, the oxygen flow reaches the set value of 70%, the nitrogen flow control valve FCV141 is...

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Abstract

The invention relates to an oxygen-enriched blast furnace oxygen supply system, an oxygen supply method and a control method of the oxygen-enriched blast furnace oxygen supply system, and belongs to the technical field of blast furnace ironmaking. Oxygen is stably output through the primary pressure stabilizing control valve stand and the secondary double-line control valve stand to meet the blast furnace assembly line work; through the security emergency control system, various derivative accidents are prevented from occurring when emergencies such as gas stop, power failure or water stop of the blast furnace occur; by arranging the mixed blowing air nozzle device, the problem of simultaneous conveying of various media such as blast furnace tuyere coal gas, oxygen, hot air, pulverized coal and nitrogen in industrial production is solved.

Description

Technical field [0001] The present invention belongs to the field of blast furnace ironmaking technology, specifically relates to an oxygen-enriched blast furnace oxygen supply system, oxygen supply method and control method thereof. Background [0002] During blast furnace production, iron ore, coke and flux are loaded from the top of the furnace, and heated compressed air, oxygen, pulverized coal and steam are blown in from the furnace vent. In the high temperature environment, the carbon in the coke, the oxides in the iron ore and the gas medium drumming into the blast furnace react to generate gas with carbon monoxide, carbon dioxide, nitrogen and hydrogen and other substances, the gas produced is discharged from the top of the furnace, the gas rises in the furnace, the carbon monoxide and hydrogen in the gas reduce the iron oxides in the iron ore, the charge is soft melted during the decline, the iron oxides are reduced to form molten iron, the unreducted oxides and flux in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B7/00C21B5/00C21B7/16
CPCC21B7/00C21B5/00C21B7/16
Inventor 田宝山刘磊王卫兵
Owner XINJIANG BAYI IRON & STEEL
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