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Method for determining air inlet area of blast furnace tuyere

A technology for determining the method and air inlet area, applied in blast furnace, tuyere, blast furnace details, etc., can solve the problem of lack of comprehensiveness of quantification method, and achieve the effect of easy operation

Pending Publication Date: 2022-03-04
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the selection of the blast furnace air inlet area is generally determined simply based on the size of the effective volume of the blast furnace, and the quantification method lacks certain comprehensiveness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] A method for determining the air inlet area of ​​a blast furnace tuyere, for a certain 4117m2 3 Blast furnace, hearth diameter 13.6m, blast furnace oxygen enrichment 39000m 3 / h, the amount of pulverized coal injection (hourly coal volume) 76t / h, pulverized coal injection H 2 Content 4%, blast humidity 11g / m 3 ; The specific steps for determining the suitable air inlet area of ​​the blast furnace are as follows:

[0053] 1) Calculate the cross-sectional area S of the hearth of the blast furnace according to the inner shape of the blast furnace 截 ;S 截 = πD 2 / 4 (D is the hearth section radius) = π13.6 2 / 4=145.27m 2 ; The reasonable bosh gas index of blast furnace is selected as 68.45m 3 / m 2 , then the reasonable bosh gas volume of the blast furnace is 68.45×145.27=9944m 3 / min;

[0054] 2) According to the amount of bosh gas, oxygen enrichment, and injection pulverized coal H 2 Concrete conditions such as content, blast humidity etc. calculate and deduce the...

Embodiment 2

[0068] A method for determining the air inlet area of ​​a blast furnace tuyere, for a certain 2800m2 3 Blast furnace, hearth diameter 11.4m, blast furnace oxygen enrichment 20685m 3 / h, the amount of pulverized coal injection is 46t / h, the pulverized coal injection H 2 Content 4%, blast humidity 15g / m 3 , the steps to determine the suitable air inlet area of ​​the blast furnace are as follows:

[0069] 1) Calculate the cross-sectional area of ​​the hearth of the blast furnace according to the inner shape of the blast furnace; S 截 = πD 2 / 4 (D is the section radius of the hearth), the calculated cross-sectional area of ​​the hearth is: S 截＝ π11.4 2 / 4=102.07m 2 ; The reasonable bosh gas index of blast furnace is selected as 67.2m 3 / m 2 .The reasonable bosh gas volume of blast furnace is 67.2×102.07=6862m 3 / min;

[0070] 2) adopt the method described in embodiment 1, according to the bosh gas amount, oxygen enrichment amount, injection pulverized coal H 2The corresp...

Embodiment 3

[0078] A method for determining the air inlet area of ​​a blast furnace tuyere, for a certain 3200m2 3 Blast furnace, hearth diameter 12.4m, blast furnace oxygen enrichment 26053m 3 / h, injection pulverized coal volume 56t / h, injection pulverized coal H 2 Content 4%, blast humidity 11g / m 3 ; The specific steps for determining the suitable air inlet area of ​​the blast furnace are as follows:

[0079] 1) Calculate the cross-sectional area S of the hearth of the blast furnace according to the inner shape of the blast furnace 截 ;S 截 = πD 2 / 4 (D is the hearth section radius) = π12.4 2 / 4=120.76m 2 ; The reasonable bosh gas index of blast furnace is selected as 65.3m 3 / m 2 ; Then the reasonable bosh gas volume of blast furnace is Q=65.3×120.76=7883m 3 / m 2 ;

[0080] 2) adopt the method described in embodiment 1, according to the bosh gas amount, oxygen enrichment amount, injection pulverized coal H 2 The corresponding relationship between blast furnace blast volume (...

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Abstract

The invention discloses a method for determining the air inlet area of a blast furnace tuyere. The method comprises the following steps: 1) determining parameters such as hearth diameter, blast furnace air volume and oxygen-containing air volume adopted for blast furnace operation; 2) calculating the blast furnace hearth sectional area according to the blast furnace profile, and determining the bosh gas amount according to the bosh gas index; 3) calculating the blast furnace bosh gas volume according to the oxygen-containing air volume, the blast furnace oxygen enrichment amount, the H2 content of the injection pulverized coal, the injection pulverized coal amount and the blast humidity, and constructing a linear coefficient between the blast furnace bosh gas volume and the blast furnace air volume; and 4) establishing a relationship between the blast-furnace tuyere air inlet area and the blast-furnace hearth sectional area according to the linear coefficient, and calculating the obtained blast-furnace tuyere air inlet area. By the adoption of the quantification method, the blast speed, blast kinetic energy and the depth of a rotation area of the blast furnace can be within proper ranges, mass transmission, heat transmission and momentum transmission of a blast furnace hearth are guaranteed, and initial distribution of blast furnace gas flow is formed; and the related determination method is simple and convenient and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of blast furnace smelting, and in particular relates to a method for determining the air inlet area of ​​a blast furnace tuyere. Background technique [0002] The blast furnace is a shaft furnace type counter-flow reactor. The raw fuel (sintering + pellets + lump ore + coke) added from the top of the furnace is affected by the high-temperature reducing gas flowing upstream (the reducing gas is blown in by the blower, heated by the hot blast stove, and then enters the blast furnace through the tuyeres. Combustion reaction with the coke of the blast furnace to generate gas), which is continuously heated, decomposed, reduced, softened, melted, dripped, carburized, and finally formed into slag iron melt and separated. [0003] The blast furnace contains a variety of systems: such as air supply system, charging system, heat system, slagging system, slag and iron system, cooling system, etc. Among them, the blas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/04G16C20/10C21B5/00C21B7/16
CPCG06Q10/04G06Q50/04G16C20/10C21B5/006C21B7/16Y02P90/30
Inventor 尹腾陈胜香张正东李昕彭浩朱义斌薛玉卿
Owner 武汉钢铁有限公司
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