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Blast furnace injection coal and safe and efficient injection method thereof

A blast furnace injection coal and lean coal technology, applied in the field of smelting, can solve the problems of low calorific value, low use value, and low carbon content, and achieve the effects of alleviating inefficient utilization, reducing coal blending costs, and improving combustion rate

Pending Publication Date: 2021-07-16
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lignite is a young coal with a low degree of deterioration. Its main characteristics are high moisture (35%-50%), high volatile matter (35-50%), strong explosiveness (flame return length > 750mm, which belongs to strong explosive coal), and Low carbon content (35-60%), low calorific value (about 2700Kcal / kg), easy to be natural in the air, not suitable for direct use in blast furnace injection, currently lignite resources are mainly used for industrial boiler fuel and household fuel, and the use value is extremely high Low

Method used

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  • Blast furnace injection coal and safe and efficient injection method thereof
  • Blast furnace injection coal and safe and efficient injection method thereof
  • Blast furnace injection coal and safe and efficient injection method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A safe and efficient injection method for blast furnace injection coal with lignite, comprising the following steps:

[0039] 1) Formulate key parameter control of the mill, mill inlet O 2 Concentration = 6%, exit O 2 Concentration = 10%, bag box outlet O 2 Concentration = 12%. The inlet temperature of the mill is less than or equal to the ignition point of mixed coal 50°C, the outlet temperature is controlled at 80°C, and the outlet temperature of the bag box is 75°C.

[0040] 2) Stir and mix 20% lignite, 48% lean coal, and 32% anthracite, transport the mixed coal to the raw coal bunker through the belt, and feed the coal through the coal feeder into the coal mill for grinding The coal pulverizer is controlled according to the parameters in step 1, and the alarm and automatic flushing of N2 safety chain protection are realized.

[0041] 3) The mixed coal powder is collected by the bag powder collector, and the compressed air is transported to the blast furnace inje...

Embodiment 2

[0048] A safe and efficient injection method for blast furnace injection coal with lignite, comprising the following steps:

[0049] 1) Formulate key parameter control of the mill, mill inlet O 2 Concentration = 4%, exit O 2 Concentration = 8%, bag box outlet O 2 Concentration = 10%. The inlet temperature of the mill is less than or equal to the ignition point of mixed coal 50°C, the outlet temperature is controlled at 85°C, and the outlet temperature of the bag box is 80°C.

[0050] 2) Stir and mix 30% lignite, 42% lean coal, and 28% anthracite, transport the mixed coal to the raw coal bunker through the belt, and feed the coal through the coal feeder into the coal mill for grinding Mixed pulverized coal with a proportion of 65% of 200 mesh, the coal pulverizer is controlled according to the parameters in step 1, and the alarm and automatic flushing of N2 safety chain protection are realized.

[0051] 3) The mixed coal powder is collected by the bag powder collector, and ...

Embodiment 3

[0058] A safe and efficient injection method for blast furnace injection coal with lignite, comprising the following steps:

[0059] 1) Formulate key parameter control of the mill, mill inlet O 2 Concentration = 5%, exit O 2 Concentration = 9%, bag box outlet O 2 Concentration = 11%. The inlet temperature of the mill is less than or equal to the ignition point of mixed coal 50°C, the outlet temperature is controlled at 75°C, and the outlet temperature of the bag box is 70°C.

[0060] 2) Stir and mix 10% lignite, 54% lean coal, and 36% anthracite, transport the mixed coal to the raw coal bunker through the belt, and feed the coal through the coal feeder into the coal mill for grinding Mixed pulverized coal with a proportion of 70% to 200 mesh, the coal mill is controlled according to the parameters in step 1, and the alarm and automatic flushing of N2 safety chain protection are realized.

[0061] 3) The mixed coal powder is collected by the bag powder collector, and the co...

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Abstract

The invention discloses blast furnace injection coal and a safe and efficient injection method thereof. The blast furnace injection coal is pulverized coal prepared by mixing and grinding anthracite, lean coal and lignite. The lignite accounts for 10%-30%, the anthracite accounts for 36%-28%, and the lean coal accounts for 54%-42%. The safe and efficient injection method comprises the following steps that components are mixed by using a mill to prepare the pulverized coal; the pulverized coal is collected by using a cloth bag powder collector; the inlet flue gas temperature of the mill is controlled to be less than or equal to the ignition point 50 DEG C of mixed coal, the inlet flue gas oxygen concentration of the mill to be less than or equal to 6.00% and the outlet flue gas oxygen concentration of the mill to be less than or equal to 10.00%; the pulverized coal is collected by using the cloth bag powder collector; the pulverized coal is conveyed to a blast furnace injection station by using compressed air through a pipeline; the pulverized coal is conveyed to a blast furnace distributor via an injection tank to be distributed to each tuyere pulverized coal spray gun; and finally the pulverized coal is sprayed into a blast furnace through a blast furnace tuyere. By the adoption of the technical measures of reasonable coal blending, key process parameter control, proper widening of the granularity of the pulverized coal and the like, the safety control over a coal pulverizing system is effectively realized, the combustion rate of the pulverized coal is improved, and the coal blending cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of smelting, and in particular relates to a blast furnace injection coal and a safe and efficient injection method thereof. Background technique [0002] In recent years, with the rapid expansion of China's iron and steel production capacity and the advancement of blast furnace coal injection technology, the coal injection ratio has increased significantly, resulting in increased consumption of high-quality PCI resources, reduced resources, and rising prices. The price of high-quality PCI coal in some areas has approached the price of coke , which seriously restricts the profit margins of energy saving, consumption reduction and cost reduction of iron and steel enterprises, and there is an urgent need to broaden the selection range of coal types for blowing. [0003] Lignite is a young coal with a low degree of deterioration. Its main characteristics are high moisture (35%-50%), high volatile matter (35-50%)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
CPCC21B5/003C21B5/008
Inventor 王亚力罗英杰胡兴康汪勤峰
Owner WUKUN STEEL
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