Blast furnace stockline descending top temperature controlling and detonation preventing method

A technology of empty material line and blast furnace, which is applied in the direction of blast furnace, blast furnace details, blast furnace parts, etc., can solve the problems that are not conducive to environmental protection and fail to achieve green production, and achieve improvement and reduction of furnace top temperature, good dilution effect, and shortened time Effect

Inactive Publication Date: 2019-09-13
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This technology improves cool down on steel making equipment used for producing molten metal during production without causing damage caused by excessive temperatures at certain points along its path. By forming tiny particles called bubbles near these locations where it comes into contact with hot gases, the process takes longer than if just before all that happens. To prevent overcooling, blows are made towards specific areas around them instead of directly hitting the surface. Additionally, the use of low oxygen levels reduces nitrogen oxide emissions compared to traditional methods like smelting techniques. Overall, this new system simplifies the manufacturing processes while reducing costs associated with energy consumption.

Problems solved by technology

This patented problem addressed during maintenance operations relates to ensuring proper thermal regulation while avoiding excessive pressure inside the furnance caused by unstable fluid flows within the furniture space. Existing methods such as draining the charged materials through holes near the bottom require long periods before they can be fully emptied without risking accidents like pipe cracks or fires. Additionally, existing techniques have limitations in terms of how much oxygen may enter the furnish vessel during startup/repair processes leading to potential explosion risks.

Method used

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  • Blast furnace stockline descending top temperature controlling and detonation preventing method
  • Blast furnace stockline descending top temperature controlling and detonation preventing method

Examples

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Effect test

Embodiment 1

[0031] The method for controlling the top temperature of the blast furnace lowering line to prevent knocking, the specific implementation steps are as follows:

[0032] The effective volume of a blast furnace is 3200m 3 , In 2014, the empty material line was shut down for medium repair and the bosh stave was replaced.

[0033] (1) During the small wind break before the blast furnace shut down, remove the sprinkling device on the top of the furnace, install 8 purchased special atomizing water pumps, and install valves and flow meters, and then connect them to the industrial water pipe network. The maximum pumping capacity is 150t / h. In the process of emptying the material line, adjust the opening of the valve according to the actual temperature of the furnace top to control the amount of water drawn. The actual maximum pumping volume is 132t / h, and the top temperature is always within the required range.

[0034] (2) During the small wind break before the shutdown of the bl

Embodiment 2

[0037] A method for controlling top temperature and preventing detonation in a blast furnace lowering line. The specific implementation steps are as follows:

[0038] The effective volume of a blast furnace is 2600m 3 , In 2017, the empty material line was shut down for intermediate repairs to replace the bosh stave.

[0039] (1) During the small wind break before the blast furnace shut down, remove the sprinkling device on the top of the furnace, install 6 purchased special atomizing water pumps, and install valves and flow meters, and then connect them to the industrial water pipe network. The maximum pumping capacity is 130t / h. In the process of emptying the material line, adjust the opening of the valve according to the actual temperature of the furnace top to control the amount of water drawn. The actual maximum pumping volume is 115t / h, and the top temperature is always within the required range.

[0040] (2) During the small wind break before the shutdown of the blast

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Abstract

The invention discloses a blast furnace stockline descending top temperature controlling and detonation preventing method. The method specifically comprises the steps that (1) a special furnace top atomized water injector is mounted, specifically, a purchased special furnace top atomized water injector is utilized for replacing a traditional water injecting pipe, and when being sprayed out of thefurnace top sprinkling atomized water injector, water is atomized to form water mist, wherein the diameter of water drops in the water mist is 10-20 [mu]m; and (2) N2 is sprayed and injected from a furnace body static pressure measuring hole and an air port coal lance, specially, before stockline descending, a pressure measurer is dismounted, an N2 spraying pipe is connected and communicates withan N2 pipe network of a blast furnace, and the air port coal lance stops spraying coal during stockline descending and only performs N2 spraying and injecting. By means of the method provided by the invention, the furnace top temperature decreasing effect can be improved, and in addition, the situation that the water drops have no time to vaporize and make direct contact with liquid slag iron canbe avoided; and furthermore, the method for spraying and injecting the N2 from the furnace body static pressure measuring hole and the air port coal lance is simple and feasible, the sprayed and injected N2 gas dilutes coal gas, it is guaranteed that the content of O2 in the coal gas meets standards while a large air capacity is maintained for descending the stockline, and the stockline descendingtime is shortened by around 15 h.

Description

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Claims

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Application Information

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Owner 武汉钢铁有限公司
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