A method for adding waste wood to blast furnace injection

A waste wood and blast furnace technology, applied in the field of metallurgical manufacturing, can solve problems such as the decline of combustion-supporting effect, and achieve the effects of reducing coke ratio, increasing coal injection amount, and increasing combustion rate

Inactive Publication Date: 2017-08-15
CHONGQING UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0004] At present, there are many types of combustion-supporting agents for coal injection in domestic blast furnaces, which are concentrated in the inorganic catalytic combustion-supporting aspects such as rare earth metal oxides and alkaline earth metal oxides, and the addition method is relatively fixed, or the coal mill at the raw powder feeding place is fed through a screw. The feeder is added, or the raw coal is dried and ground together with the raw coal in the coal mill on the raw coal conveyor belt, and then enters the tuyere of the blast furnace through the coal conveying pipeline to realize injection; but these adding methods are only suitable for inorganic mineral substances that are easy to grind. It is not suitable for waste wood as an organic additive, because the proportion of waste wood particles is much lower than that of coal powder. When this method is used, coal powder and waste wood particles will be stratified in the coal pipeline, which will significantly reduce the combustion-supporting effect;

Method used

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  • A method for adding waste wood to blast furnace injection

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Effect test

Embodiment 1

[0033] 1) Pretreatment of waste wood products:

[0034] 1.1) The collected waste wood products are mainly composed of 35% shavings, 35% waste plywood and 30% waste furniture boards, which are sorted and cleaned;

[0035] 1.2) remove the impurities mixed in the cleaned waste wood to obtain the cleaned waste wood;

[0036] 1.3) classifying the cleaned waste wood obtained in step 1.2) according to different species, and obtaining the waste wood products sorted out;

[0037] Among them, the shavings are mainly chestnut, oil pine, and fir wood shavings mixed materials, the waste plywood is mainly the plywood mixture pressed by chestnut, oil pine, and fir, and the waste furniture board is mainly artificial particle board;

[0038] The material composition of waste wood contains 50% cellulose, 25% hemicellulose, 22% lignin, 1% inorganic substances (mainly carbonates of K and Na, silicates of Ca and Mg, phosphoric acid salt, carbonate, etc.) and 2% organic matter (mainly tannins, pi...

Embodiment 2

[0046] 1) Pretreatment of waste wood products:

[0047] 1.1) The collected waste wood products are mainly composed of 40% shavings, 30% waste plywood and 30% waste furniture boards, which are sorted and cleaned;

[0048] 1.2) remove the impurities mixed in the cleaned waste wood to obtain the cleaned waste wood;

[0049] 1.3) classifying the cleaned waste wood obtained in step 1.2) according to different species, and obtaining the waste wood products sorted out;

[0050] Among them, the shavings are mainly chestnut, oil pine, and fir wood shavings mixed materials, the waste plywood is mainly the plywood mixture pressed by chestnut, oil pine, and fir, and the waste furniture board is mainly artificial particle board;

[0051]The material composition of waste wood contains 45% cellulose, 27% hemicellulose, 25% lignin, 1% inorganic substances (mainly K, Na carbonate, Ca, Mg silicate, phosphoric acid salt, carbonate, etc.) and 2% organic matter (mainly tannins, pigments and resi...

Embodiment 3

[0059] 1) Pretreatment of waste wood products:

[0060] 1.1) The collected waste wood products are mainly composed of 35% shavings, 30% waste plywood and 35% waste furniture boards, which are sorted and cleaned;

[0061] 1.2) remove the impurities mixed in the cleaned waste wood to obtain the cleaned waste wood;

[0062] 1.3) classifying the cleaned waste wood obtained in step 1.2) according to different species, and obtaining the waste wood products sorted out;

[0063] Among them, the shavings are mainly chestnut, oil pine, and fir wood shavings mixed materials, the waste plywood is mainly the plywood mixture pressed by chestnut, oil pine, and fir, and the waste furniture board is mainly artificial particle board;

[0064] The material composition of waste wood contains 50% cellulose, 20% hemicellulose, 27% lignin, 1% inorganic substances (mainly carbonates of K and Na, silicates of Ca and Mg, phosphoric acid salt, carbonate, etc.) and 2% organic matter (mainly tannins, pi...

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Abstract

The invention relates to the field of metallurgical manufacture, in particular to a process method in which waste wood is granulated and injected into a blast furnace as a combustion aid for blast furnace coal injection in blast furnace ironmaking. The invention solves the problem of waste wood reuse, and according to the characteristics of waste wood in terms of combustion performance, the waste wood is sorted, cleaned, dried, and crushed as auxiliary fuel for blast furnace injection, so as to realize concentrated and efficient reuse of solid waste , It also avoids the secondary pollution caused by the solid waste treatment process.

Description

technical field [0001] The invention relates to the field of metallurgical manufacturing, in particular to a process method in which waste wood is granulated and injected into a blast furnace as a blast furnace coal-injection combustion-supporting agent in blast furnace ironmaking; Background technique [0002] Blast furnace coal injection technology has become a measure to greatly reduce the coke ratio. This is one of the major technological developments in the past 40 years. The blast furnace pulverized coal injection at home and abroad has achieved good results; , high smelting strength and oxygen-enriched technical means, but blindly pursuing high coal ratio will cause an increase in unburned coal powder due to the extremely short residence time of coal powder in the tuyere combustion zone, affecting the gas permeability of the material column and the viscosity of the slag. Therefore, increasing the combustion rate of pulverized coal in the tuyere combustion zone and acc...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C21B5/00
Inventor刘清才姚璐任山
OwnerCHONGQING UNIV