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Method for increasing combustion rate of coal powder by adding furnace-front dust of blast furnace to injection coal

A technology of pulverized coal combustion rate and furnace dust, which is applied to the field of adding blast furnace front dust to injection coal to improve the coal dust combustion rate, can solve the problems of low utilization rate of blast furnace front dust, large environmental pollution, easy to raise dust, and the like. The effect of reducing long-distance transportation and other processes for processing blast furnace dust, reducing environmental pollution and reducing fuel consumption

Active Publication Date: 2015-12-02
WUKUN STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Blast furnace ironmaking produces a large amount of blast furnace dust every year. If it cannot be fully recycled, it will cause waste of resources on the one hand, and adversely affect the environment on the other hand, increasing the environmental protection cost of the enterprise
At present, the furnace dust is mainly used as a sintering raw material and added to the sintering raw material, but due to the small particle size during transportation, it is easy to raise dust and cause great environmental pollution.
Since the blast furnace dust has a certain negative impact on the quality of sinter, the proportion of sinter mixed ore is generally not more than 5%, and the utilization rate of blast furnace dust is not high, so it is necessary to further develop other ways to use blast furnace dust
[0003] In the absence of any additives, the combustion rate of blast furnace injection coal is relatively low. In order to increase the combustion rate of blast furnace injection coal, it is necessary to further explore ways to improve the combustion of blast furnace injection coal

Method used

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  • Method for increasing combustion rate of coal powder by adding furnace-front dust of blast furnace to injection coal
  • Method for increasing combustion rate of coal powder by adding furnace-front dust of blast furnace to injection coal
  • Method for increasing combustion rate of coal powder by adding furnace-front dust of blast furnace to injection coal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Step (1): Collect blast furnace dust and transport it to the injection coal pulverization workshop;

[0030] Step (2): Add 1.0% blast furnace dust to the injection coal and mix it evenly, and transport it to the coal mill through the belt conveyor to make mixed coal powder. 2 Content 6%, coal mill outlet O 2 content of 10%, the inlet temperature of the coal mill is 60°C lower than the mixed coal ignition point (350°C), the outlet temperature of the coal mill is 75°C, the mixed coal powder is collected by the bag powder collector, and the outlet of the bag powder collector is O 2 The content is 12%, and the outlet temperature of the bag powder collector is 85°C;

[0031] Step (3): Use compressed air to transport the mixed pulverized coal through the pipeline to the blast furnace injection station, and then through the injection tank to the blast furnace distributor, so that the mixed pulverized coal is distributed to each coal injection gun, and finally sprayed into the...

Embodiment 2

[0036] Step (1): Collect blast furnace dust and transport it to the injection coal pulverization workshop;

[0037] Step (2): Add 2.0% blast furnace dust to the injection coal and mix it evenly, and transport it to the coal mill through the belt conveyor to make mixed coal powder. 2 Content 6%, coal mill outlet O 2 content of 8%, the inlet temperature of the coal mill is 50°C lower than the mixed coal ignition point (350°C), the outlet temperature of the coal mill is 75°C, the mixed coal powder is collected by the bag powder collector, and the outlet of the bag powder collector is O 2 The content is 10%, and the outlet temperature of the bag powder collector is 80°C;

[0038] Step (3): Use compressed air to transport the mixed pulverized coal through the pipeline to the blast furnace injection station, and then through the injection tank to the blast furnace distributor, so that the mixed pulverized coal is distributed to each coal injection gun, and finally sprayed into the ...

Embodiment 3

[0040] Step (1): Collect blast furnace dust and transport it to the injection coal pulverization workshop;

[0041] Step (2): Add 3.0% blast furnace dust to the injection coal and mix it evenly, and transport it to the coal mill to make mixed coal powder through the belt conveyor. 2 Content 6%, coal mill outlet O 2 content of 8%, the inlet temperature of the coal mill is 50°C lower than the mixed coal ignition point (350°C), the outlet temperature of the coal mill is 75°C, the mixed coal powder is collected by the bag powder collector, and the outlet of the bag powder collector is O 2 The content is 10%, and the outlet temperature of the bag powder collector is 80°C;

[0042] Step (3): Use compressed air to transport the mixed pulverized coal through the pipeline to the blast furnace injection station, and then through the injection tank to the blast furnace distributor, so that the mixed pulverized coal is distributed to each coal injection gun, and finally sprayed into the bl...

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Abstract

The invention discloses a method for increasing the combustion rate of coal powder by adding furnace-front dust of a blast furnace to injection coal. The method comprises steps as follows: step (1), the furnace-front dust of the blast furnace is collected and transported to an injection coal grinding workshop; step (2), 1.0%-.4.0% of the furnace-front dust of the blast furnace is added to the injection coal, the mixture is transported to a coal grinding machine through a belt conveyor to be prepared to form mixed coal powder, and the mixed coal powder is collected by a bag type powder collector; step (3), the mixed coal powder is conveyed to a blast furnace injection station through compressed air via a pipeline, then conveyed to a blast furnace distributor through an injection tank, distributed to coal injection lances and sprayed into the blast furnace to be combusted from a blast furnace tuyere finally. The furnace-front dust of the blast furnace is added to the injection coal, so that the amount of ore and coke required for smelting of each ton of iron is reduced; the combustion rate of the coal powder is increased due to addition of a proper amount of Fe2O3 to the coal powder, and the comprehensive fuel ratio of the blast furnace is reduced due to the increase of the combustion rate; SiO2 in the furnace-front dust of the blast furnace t performs the function of an abrasive, and the yield of the coal powder is increased.

Description

technical field [0001] The invention belongs to the technical field of blast furnace injection, and in particular relates to a method for adding blast furnace dust to injection coal to increase the combustion rate of pulverized coal. Background technique [0002] Blast furnace dust is mainly the dust generated during blast furnace tapping and slag discharge and the dust generated from the top of the blast furnace top main belt material feeding into the blast furnace. The furnace dust mainly contains TFe, C and a small amount of other metal elements. Blast furnace ironmaking produces a large amount of blast furnace dust every year. If it cannot be fully recycled, it will cause waste of resources on the one hand, and adversely affect the environment on the other hand, increasing the environmental protection cost of the enterprise. At present, furnace dust is mainly used as sintering raw material and added to sintering raw material, but during transportation, due to its small p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B5/00
Inventor 汪勤峰王亚力李明刘宁斌杨立新
Owner WUKUN STEEL
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