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Oxygen-enriched dry gas supply process for blast furnace iron-making

A technology of oxygen-enriched dry gas and blast furnace ironmaking, which is applied to blast furnaces, blast furnace details, blast furnace parts, etc., can solve the problems of high energy consumption in device system operation, large investment in power equipment, and large energy consumption in oxygen-enriched preparation, achieving Reduce preparation energy consumption, lower equipment investment, and optimize equipment investment

Inactive Publication Date: 2012-12-05
李东林 +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The oxygen supply process still has the following disadvantages: due to the use of air compressors or vacuum units in the process of preparing oxygen enrichment, the energy consumption of oxygen enrichment preparation is relatively large, and if the method of adding oxygen enrichment after the blast furnace blower is used, the oxygen pressure needs to be increased Machine boosting, energy consumption and investment need to be further improved, and the entire device system requires high energy consumption, equipment occupies a large area, and requires a large investment
Therefore, the oxygen-enriched combustion device still has the disadvantages of large power equipment investment and high energy consumption, and is not suitable for blast furnace ironmaking

Method used

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  • Oxygen-enriched dry gas supply process for blast furnace iron-making
  • Oxygen-enriched dry gas supply process for blast furnace iron-making

Examples

Experimental program
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Effect test

Embodiment 1

[0028] An oxygen-enriched dry gas supply process for blast furnace ironmaking, characterized in that: the process steps include: the air pressurized by a blast furnace blower is cooled by a precooler and an air cooler, and the moisture in it is directly removed by PSA And part of the nitrogen, the obtained oxygen-enriched dry gas returns to the pre-cooler to heat up, and then enters the hot blast stove and sends it to the blast furnace for combustion support.

[0029] The blast furnace blower is pressurized, and the gauge pressure of the outlet air of the blast furnace blower is 0.25MPa.

[0030] The PSA adopts a plurality of adsorption towers connected in parallel, and the adsorption towers are sequentially filled with dehydration adsorbents and oxygen-generating molecular sieves from bottom to top to absorb and remove trace amounts of water and nitrogen.

[0031] In the adsorption tower, the operation steps of each adsorption tower include adsorption, pressure equalization a...

Embodiment 2

[0036] Same reason, as embodiment 1.

[0037] An oxygen-enriched dry gas supply process for blast furnace ironmaking. The process steps include: the gauge pressure after being pressurized by the blast furnace blower is 0.35Mpa, after being cooled by the precooler and the air cooler, the air temperature before entering the PSA is 85 ℃, humidity 10g / m 3 , the water and part of the nitrogen are removed directly by PSA, and the dew point temperature of the oxygen-enriched dry gas is -10°C, the oxygen-enriched gas is 23%, and the humidity is 1.92 g / m 3 , the obtained oxygen-enriched dry gas is returned to the pre-cooler for heating, and then sent to the blast furnace for combustion after being heated by a hot blast stove.

Embodiment 3

[0039] The same reason, as mentioned above.

[0040] An oxygen-enriched dry gas supply process for blast furnace ironmaking. The process steps include: the air is pressurized by a blast furnace blower to obtain a gauge pressure of 0.45Mpa, and after being cooled by a precooler and an air cooler, the air temperature before entering the PSA is 75°C, humidity 8g / m 3 , the moisture and part of the nitrogen are directly removed by PSA, and the dew point temperature of the oxygen-enriched dry gas is -20°C, the oxygen-enriched gas is 22%, and the humidity is 0.76 g / m 3 , the obtained oxygen-enriched dry gas is returned to the pre-cooler for heating, and then sent to the blast furnace for combustion after being heated by a hot blast stove.

[0041] Among them, the air cooled by the pre-cooler and the air cooler passes through the gas-water separator, and then the moisture and part of the nitrogen are removed by PSA, and the obtained oxygen-enriched dry gas returns to the pre-cooler f...

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Abstract

The invention relates to the technical field of blast furnace iron-making processes, and provides an oxygen-enriched dry gas supply process adaptive to a smelting course of blast furnace iron-making. The oxygen-enriched dry gas supply process provided by the invention comprises the steps as follows: after air pressurized by a blast furnace blower is cooled by a precooler and an air cooler, water and partial nitrogen gas in the air are directly removed through pressure swing adsorption (PSA); and obtained oxygen-enriched dry gas returns to the precooler to be heated and then sent to a blast furnace by a hot blast stove to be used for supporting the combustion. According to the process, equipment in the prior smelting process of blast furnace iron-making is fully utilized, and the air pressurized via an outlet of the blast furnace blower is directly utilized to prepare the oxygen-enriched dry gas through PSA, so that the manner in the prior art that the oxygen-enriched dry gas can be prepared only by externally adding enriched oxygen is changed. The oxygen-enriched dry gas supply process has the characteristics of low equipment investment and low operational energy consumption.

Description

[0001] technical field [0002] The invention relates to the technical field of blast furnace ironmaking technology, in particular to a supply process for directly making air into oxygen-enriched dry gas which can be used in blast furnace ironmaking. Background technique [0003] In the blast furnace ironmaking process, oxygen-enriched blast technology and dehumidification blast technology are widely used intensified smelting technologies. Among them, the oxygen-enriched blast is mainly to add industrial oxygen during the blast to increase the oxygen content in the blast, so that the oxygen-enriched content in the gas is ≥ 21%, which improves the smelting intensity and the combustion temperature at the hearth tuyeres, thereby increasing the blast furnace Yield and reduced focal ratio. The dehumidification blast is to reduce the humidity of the combustion air entering the blast furnace to the value required by the best operation and keep it stable by removing the moisture ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B9/16C21B5/00
Inventor 李东林郎治王华金苏为民马光俊
Owner 李东林
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