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A method for preventing explosion of high-draw carbon converter dry dust removal system

A technology of converter dry dust removal and high carbon pulling, which is used in the manufacture of converters and other directions, can solve problems such as electrostatic precipitator explosion venting, and achieve the effects of safe production, prevention of explosion venting, and improvement of molten steel quality.

Active Publication Date: 2017-02-01
TANGSHAN IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through research, there is currently no mature technology to prevent the explosion venting of the electrostatic precipitator when the converter is drawing carbon at high temperature

Method used

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  • A method for preventing explosion of high-draw carbon converter dry dust removal system
  • A method for preventing explosion of high-draw carbon converter dry dust removal system
  • A method for preventing explosion of high-draw carbon converter dry dust removal system

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Experimental program
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Effect test

Embodiment 1

[0042] In this embodiment, furnace number 4A10149, steel number: HRB400B, steel type: low alloy, C: 0.20-0.25%. When the low alloy is produced by the high carbon drawing method, the oxygen flow is manually adjusted to 50% of the rated oxygen supply flow 20s before carbon drawing, and the nitrogen valve behind the evaporative cooler is opened at the same time, the nitrogen flow rate is 7800Nm3 / h, and the nitrogen filling time is 30s . Oxygen flow rate is by rated oxygen supply flow rate when supplementary blowing, does not operate according to the method of the present invention. Draw CO-O2-CO2(+N2) according to the flue gas composition of the furnace number Figure 5 Ternary graph, by Figure 5 It can be seen that the smoke components did not bypass the explosion hazard zone during supplementary blowing. The field practice showed that during the smelting of this furnace number, a small explosion vent occurred during supplementary blowing.

Embodiment 2

[0044] In this embodiment, furnace number 4B12161, steel number: 55#, steel type: high carbon steel, C: 0.53-0.57%. Use the high carbon method to control the end point, manually adjust the oxygen flow to 50% of the rated oxygen supply flow 20s before pulling carbon, and open the nitrogen valve behind the evaporative cooler at the same time, the nitrogen flow rate is 7800Nm 3 / h, nitrogen flushing time 30s. During supplementary blowing, the oxygen flow is manually adjusted so that the oxygen supply flow is 65% of the rated oxygen flow. According to the flue gas composition of the furnace number, the CO-O 2 -CO 2 (+N 2 ) Figure 6 Ternary diagram, the dotted line ABC is flue gas CO-O when high carbon is drawn 2 -CO 2 (+N 2 ) composition curve, it can be seen from the figure that the composition obviously avoids the explosion area. CD is CO-O when supplementary blowing 2 -CO 2 (+N 2 ) composition curve, and the composition is also far away from the explosion range. No...

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Abstract

The invention discloses a method for preventing explosion venting of a dry dedusting system of a catch carbon converter, belongs to the technical field of dry dedusting of converters, and is used for preventing the dry dedusting system of the catch carbon converter from generating the explosion venting accident. The oxygen flow and the nitrogen blowing amount in the catch carbon operation are controlled, and the oxygen blowing amount mode is controlled according to the catch carbon content in secondary gun reblowing, so that the xplosion venting of the dry dedusting system of the catch carbon converter can be effectively prevented, the safety production is realized, the operability of the converter is improved, the production cost is reduced, and the molten steel quality is enhanced. Under the conditions of the dry dedusting technology, the target of stably producing low alloys (HRB400 series) and high-carbon steels (40-80#, 77B, 82B and the like) by the converter catch carbon method is realized.

Description

technical field [0001] The invention relates to a method capable of preventing explosion venting of a high-draw carbon converter dry dedusting system, and belongs to the technical field of converter dry dedusting methods. Background technique [0002] With the development of oxygen converter steelmaking production and the improvement of steelmaking process, dust removal technology is also developing and maturing. There are two main methods for purification and recovery of oxygen converter steelmaking, namely wet gas method (OG) and dry gas method (LT). Correspondingly, the gas dry method (LT) can directly reduce the dust concentration (standard state) to 10mg / m3 through the electrostatic precipitator 3 In the following, its dust removal and purification efficiency is high and it is widely used. [0003] At present, converter dry dedusting technology has been recognized internationally as the development direction in the future. It can partially or completely compensate all...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C5/38
Inventor 韩志杰郝华强李波刘善喜吴海东孙玉霞李双武王振刚项有兵
Owner TANGSHAN IRON & STEEL GROUP
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