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Method for prolonging coal gas recovery time in blast furnace stockline-descending blowing-out process

A technology of empty material line and gas, which is applied in the control of blast furnace shutdown to draw water and empty material line, and the field of blast furnace empty material line shutdown to prolong the time of gas recovery, which can solve the problems of long time air pollution, etc., to prolong the time of gas recovery and generate electricity The effect of increasing time and obvious social benefits

Active Publication Date: 2019-02-01
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Many blast furnaces are forced to stop recovering gas when the material level drops below the furnace waist when the gas contains more than 12% H2, and the gas pressure frequently has high peaks during the shutdown process of the blast furnace empty material line. The gas cut-off valve stops the recovery of gas near the furnace waist and bosh from the empty material line, the recovery time of gas is short, and the pollution time to the atmosphere is long

Method used

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  • Method for prolonging coal gas recovery time in blast furnace stockline-descending blowing-out process
  • Method for prolonging coal gas recovery time in blast furnace stockline-descending blowing-out process
  • Method for prolonging coal gas recovery time in blast furnace stockline-descending blowing-out process

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Embodiment 1

[0047] This embodiment provides a method for shutting down the blast furnace empty material line to prolong the recovery time of gas, which specifically includes the following steps:

[0048] (1) Install blast furnace top atomization water pumping system before shutdown, and use it normally

[0049] Install the furnace top atomization water pumping system before the shutdown of the furnace. The specific requirements of the water pumping system: ①The number of spray guns should reach at least 8; ②The water sprayed by the spray guns should have a good atomization effect, and the atomized water particles should be less than 500 μm;

[0050] (2) One day before the shutdown, adjust the composition of slag and iron and the temperature of molten iron

[0051] According to the current production situation, reduce the coke load, control the coal ratio to less than 100kg / t, add serpentine, limestone, silica, and fluorite to adjust the composition of slag and iron to ensure good fluidity...

Embodiment 2

[0071] This example provides a specific embodiment of the method of shutting down the blast furnace empty material line to prolong the recovery time of gas, using 2150m 3 blast furnace for testing;

[0072] (1) Install blast furnace top atomization water pumping system before shutdown, and use it normally

[0073] From July 12th to 14th, the blast furnace was scheduled to be repaired for 48 hours. Taking this opportunity, the original furnace top cooling sprinkler system was transformed into a furnace top atomization water pumping cooling system, and the original four water pipes on the furnace top were cut off and placed on the same level. Opened 4 new holes, purchased and installed 8 single-fluid automatic telescopic atomizing anti-blocking spray guns and water pipes, control systems, etc. on the market, and the furnace top spray water cooling system was connected to the original blast furnace top sprinkling main pipe, and the original blast furnace The top sprinkling main ...

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Abstract

The invention discloses a method for prolonging the coal gas recovery time in the blast furnace stockline-descending blowing-out process. The method specifically comprises the following steps that (1)a blast furnace top atomization water pumping system is installed before a furnace is blown out, and the furnace is normally used; (2) on the day before the furnace is blown out, the components of slag iron and the temperature of molten iron are adjusted; (3) blowing-out materials are added, wherein the blowing-out materials refer to a two-section structure + cover surface coke; (4) pre-damping down is carried out; and (5) operations of wind supply, water pumping and descending a stockline are carried out so as to meet the condition of prolonging the time for recovering coal gas and continueto recover the coal gas. The method is simple and easy to implement, the recovery of the coal gas is not stopped unit the stockline is descended to a lower level (the middle lower part of the furnacebosh), the coal gas recovery time is prolonged, so that the pollution to the atmosphere caused by the diffusion of the blast furnace coal gas is reduced, meanwhile, the blowing-out process can be safely accelerated, and the time is saved for minor repair, medium repair and heavy repair of the blast furnace.

Description

technical field [0001] The invention relates to an operation method for shutting down an ironmaking blast furnace in the metallurgical industry, and relates to a control method for stopping a blast furnace to draw water and an empty material line, in particular to a method for prolonging the gas recovery time when the blast furnace is shut down for an empty material line. Background technique [0002] The production of iron-making blast furnaces reaches a certain number of years, and they need to be repaired or overhauled. There are two methods of shutting down the blast furnace: the filling method and the empty material line method. The empty material line method means that the furnace is not charged during the shutdown process. Pump water to control furnace top temperature. When the material line falls to the vicinity of the bosh, stop recovering gas, open the furnace top relief valve, close the gas shut-off valve, and shut down the furnace when the material level falls to ...

Claims

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Application Information

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IPC IPC(8): C21B5/00
CPCC21B5/00C21B5/008
Inventor 吴泽勇
Owner NANJING IRON & STEEL CO LTD
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