Safe method applicable to shaft furnace soft coal preparation and jetting

A bituminous and safe technology, applied in blast furnaces, blast furnace details, furnaces, etc., can solve problems such as difficulty in coal blending adjustment, rising prices, and reduced efficiency of blast furnace coal injection

Inactive Publication Date: 2013-12-25
BAOSTEEL GROUP XINJIANG BAYI IRON & STEEL
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AI Technical Summary

Problems solved by technology

With the improvement of blast furnace production capacity in new and old areas, pulverizing capacity in old areas limits the further increase of coal ratio (design 1.2 million tons of iron, coal ratio 120kg / t). High 100-150 yuan / ton, coal blending adjustment is gradually difficult, and resource costs increase, which reduces the efficiency of blast furnace coal injection

Method used

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  • Safe method applicable to shaft furnace soft coal preparation and jetting
  • Safe method applicable to shaft furnace soft coal preparation and jetting

Examples

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Effect test

Embodiment

[0019] The blast furnace coal injection process of this method: transport the bituminous coal to the coal injection drying coal shed 1 for storage by vehicles from other places, stack it by driving, perform preliminary mixing and removal of debris, and then lay it flat and directly take it into the raw material warehouse 2 by driving Through the belt scale at the lower part of the raw material bin, the material is evenly proportioned to the 1#-5# belt according to the specified ratio, and transported to different raw coal bunkers 3; the pulverizing machine is turned on, and the main exhaust fan 6 generates the main force (pumping force), The exhaust gas from the hot blast stove 9 and the flue gas from the flue gas stove 8 are drawn into the coal mill 4 as a drying medium, and the coal mill rotates to crush the raw coal falling from the raw coal bunker, and the exhaust gas from the high temperature hot blast stove and the flue gas stove dries the pulverized coal and removes it. ...

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Abstract

The invention provides a safe method applicable to blast furnace soft coal preparation and jetting. The safe method comprises the steps: 1) an exhaust pipe is mounted on a hot blast furnace and extends to a chimney, and the oxygen content of hot blast furnace waste gas is controlled to be not more than 2.0%; 2) the hot blast furnace waste gas or nitrogen is utilized to replace natural wind for preparing pulverized coal and back blowing a cloth bag, the oxygen content at an inlet of a mill of a coal jetting system is not more than 4.0%, and the oxygen content at an outlet of the cloth bag is not more than 6.0%; 3) effective sealing and leaking stoppage of the waste gas pipeline of the hot blast furnace, a flue gas furnace, the mill and the cloth bag are implemented, and the system wind leakage rate is reduced to be not more than 10%; and 4) full nitrogen stamping and fluidization are adopted for a jetting blowing tank, and full nitrogen is also adopted in powdering. The method is suitable for safe preparation and jetting blowing production of raw coal with the volatile component content of not less than 25%.

Description

technical field [0001] The invention relates to the safe operation technology of blast furnace coal injection, and is particularly effective for the potential safety hazard produced by the segregation of coal powder concentration due to the segregation of gas and solid during the preparation, injection and storage of blast furnace coal injection. Background technique [0002] For blast furnace injection pulverized coal in the old area of ​​the steelmaking plant, when using highly explosive coal, the bituminous coal ignition point is 300-350°C, and the explosive flame length is 500-750mm. The proportion is gradually increased from 20% in the initial stage of production to 80%, and 10% of coke powder is added at the same time. With the improvement of blast furnace production capacity in new and old areas, pulverizing capacity in old areas limits the further increase of coal ratio (design 1.2 million tons of iron, coal ratio 120kg / t). High 100 ~ 150 yuan / ton, the adjustment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 袁万能刘文壮安志庆廖文新陶宏
Owner BAOSTEEL GROUP XINJIANG BAYI IRON & STEEL
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