CN106248518A - Coke is the evaluation methodology of degradation in blast furnace - Google Patents
Coke is the evaluation methodology of degradation in blast furnace Download PDFInfo
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- CN106248518A CN106248518A CN201610653550.2A CN201610653550A CN106248518A CN 106248518 A CN106248518 A CN 106248518A CN 201610653550 A CN201610653550 A CN 201610653550A CN 106248518 A CN106248518 A CN 106248518A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses the evaluation methodology of degradation in blast furnace of a kind of coke, the method include sampling coke specimen, measure every physical and chemical indexes of coke specimen, analyze coke smelting behavior in blast furnace and degradation mechanism according to every physical and chemical indexes；Described sample the step of coke specimen is: after blast furnace stopping damping down, start, from furnace roof, cooling of fetching water, when in blast furnace, salvage stores surface temperature starts sampling when being down to below 50 DEG C；On charge level top to cupola well lower area short transverse, to be a sample plane every 0.5 ~ 1m, take a little at the center of each sample plane and edge, each some sampling 2 ~ 10kg.The method can accurately draw coke degradation in blast furnace.
Description
Technical field
The invention belongs to technical field of blast furnace ironmaking, be specifically related to a kind of coke evaluation side of degradation in blast furnace
Method.
Background technology
Blast furnace is a black box, often through raw material and fuel quality detection, blast furnace operation technology parameter, slag ferrum physical and chemical performance
The means such as detection carry out indirect analysis to conditions of blast furnace.But, actually occur the physical-chemical reaction that series is complicated in blast furnace,
Coke degradation mechanism in research blast furnace is caused bigger difficulty by this.
Following problem it is primarily present at present: 1, the smelting behavior of research coke is often by examination in coke degradation is studied
Test the physical and chemical reaction of analog blast furnace regional area coke, but the real reaction complicated condition that coke is in blast furnace is changeable, experiment
Room there is no the experimental provision of the analog blast furnace smelting overall process of maturation, and the condition of laboratory simulation is deposited with blast furnace process actual state
In larger difference, coke actual state in blast furnace therefore cannot be reacted.2, in coke degradation is studied generally in air port and
Upper blast furnace STRENGTH ON COKE is sampled so that this research is only capable of reacting the coke degradation of regional area, the blast furnace drawn in blast furnace
The deterioration data of interior coke are the most inaccurate, it is impossible to research coke degradation trend in blast furnace.It can thus be seen that it is bad at coke
Change in research, be sampled coke in blast furnace being a difficult point.
Summary of the invention
It is an object of the invention to provide the evaluation methodology of degradation in blast furnace of a kind of coke, the method can accurate obtain
Go out coke degradation in blast furnace.
The technical solution adopted in the present invention is:
A kind of coke is the evaluation methodology of degradation in blast furnace, and the method includes obtaining coke specimen, measuring coke specimen
Every physical and chemical indexes, analyzing coke smelting behavior in blast furnace and degradation mechanism according to every physical and chemical indexes, described acquirement is burnt
The step of charcoal sample is: after blast furnace stopping damping down, starts, from furnace roof, cooling of fetching water, when in blast furnace, salvage stores surface temperature is down to
When less than 50 DEG C and furnace roof take the safety prevention measure of necessity, open in entering blast furnace furnace shell opening part above air plane
Begin to sample；On charge level top to cupola well lower area short transverse, to be a sample plane every 0.5 ~ 1m, take each
The center of sample plane and edge take a little, each some sampling 2 ~ 10kg.
By such scheme, each sample plane Shang Qu center and edge totally 4 ~ 5 points, to guarantee the dispersibility of sampling.
After intermediate repair or overhaul generally use stockline dropping stopping process, i.e. blowing out damping down, charge level is positioned at top near air port
0.5m ~ 2m, furnace charge uses the mode of fetching water to cool down.The coke that will remain in blast furnace to change the equipment such as cooling wall to need after blowing out
Dig out, so sampling should be carried out before being dug out by coke.
The coke specimen 165 ~ 170 DEG C in an oven that first will take out before the every physical and chemical indexes being measured coke specimen
2 ~ 2.5h is dried, to guarantee to dry coke specimen under temperature conditions.
Every physical and chemical indexes of mensuration coke specimen:
(1) granularity of coke specimen is measured；The coke quality of weighing each grade of 60mm, 40mm, 20mm, 10mm, 5mm, and with
Feeding density granularity contrasts, and in analysis blast furnace, coke is in the mass loss of blast furnace regional；
(2) coke apparent porosity is measured；Assay method is: extracts the intrapore gas of coke out, under the effect of atmospheric pressure, makes
Water is filled in the hole of coke, and the quality and the same sample that measure water in coke space are submerged in water the quality lost, so
Rear calculating apparent porosity；
(3) proximate analysis of coke；Measure the moisture of coke, ash, volatile matter, and calculate coke fixed carbon content；
(4) Coulomb equation is used to measure coke S content；
(5) coke degree of graphitization is measured；
(6) coke ash component measures.
Analyze coke smelting behavior in blast furnace and degradation mechanism:
(1) analyze blast furnace coke size situation of change from top to bottom, understand coke deterioration condition at each position in blast furnace；
(2) analyze the apparent porosity of coke, ash, volatile matter, S content etc., understand the size of slag ferrum hold-up in coke hole；
(3) analyze the fixed carbon content of coke, understand boudouard reaction to slag ferrum in the impact of coke in blast furnace and cupola well
The erosion of STRENGTH ON COKE；
(4) analyzing the ash component of coke, owing to a large amount of slag ferrum are trapped in coke gap, in further analysis slag ferrum, each element divides
Cloth situation, and analyze the harmful element such as alkali metal and Zn enrichment condition in blast furnace.
The beneficial effect comprise that:
The present invention utilizes the chance of intermediate repair or overhaul, and in stove, from charge level top to cupola well lower height direction, each is put down
Coke physical and chemical index in residual coke, and further analytical furnace is taken out in face, studies coke deterioration behavior in blast furnace, can be to height
The coke in stove upper, middle and lower portion carries out deterioration analysis, makes analysis result more accurate, and this is to coke after pyroreaction in blast furnace
Understanding is more comprehensively, directly；
The present invention, using coke after pyroreaction in blast furnace as object of study, compares laboratory simulation more objective, compares
It is higher that practicality dissected by blast furnace；
By researching and analysing intermediate repair residual coke, the STRENGTH ON COKE deterioration Behavior law at each position of blast furnace recognizes more
Deeply；The coke quality index used for proposing to be more suitable for blast furnace provides the foundation data；
It is detained slag ferrum according to coke and can analyze State of Blast Furnace slag making rule, can make alkali metal in blast furnace and zinc enrichment cycles quantitatively to divide
Analysis, it is more accurate to hold blast furnace characteristic, can be used for instructing blast fumance.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the sampling schematic diagram in blast furnace.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, not
For limiting the present invention.
As it is shown in figure 1, December 3 days to 2014 November in 2014 is repaiied in No.6 BF in WISCO blast furnace stopping on the 18th, last 45 days,
Repairing employing stockline dropping blowing out in this, before blowing out, upper Mn ore deposit, improves furnace temperature, uses furnace roof to be atomized technology such as fetching water, for the last time
After damping down taps a blast furnace, coke is down to about 0.5m above air plane, in anxious top be positioned at 2.5m above air plane, it is achieved safety
Blowing out.After No.6 BF in WISCO blast furnace staying blowing out, in stove, residue proceeds by after fetching water and cooling down to burn two sets and change cooling wall etc. and executes
Work industry, needs to dig out the coke remained in blast furnace to change the equipment such as cooling wall, so coke should dug by sampling
Carry out before going out.
On November 8th, 2014 to 14 days, in stove below Jiao Dui top 4.7m, from (coke) charge level top in stove
To cupola well lower area short transverse, and each height aspect (being a sample plane every 0.5 ~ 1m, each sample plane
Each 4 ~ 5 points in Shang Qu center and edge) take out coke specimen, and it is dried, do grain size analysis, Industrial Analysis, ash one-tenth
Point mensuration etc., thus the composition transfer that the STRENGTH ON COKE carbon's solution loss reaction in blast-furnace tuyere region, coke are detained slag ferrum has had more straight
The understanding seen, the related data that some aspects is dissected with blast furnace is the most identical.Particularly as follows:
1, sampling
After blowing out damping down, furnace roof starts atomization and fetches water cooling, when in blast furnace, salvage stores surface temperature is down to less than 50 DEG C, and
When furnace roof takes the safeguard procedures of necessity, furnace shell opening part above air plane enter high furnace inner sampling, when under charge level in stove
It is down to during below air plane be entered blast furnace by air port；Concrete sampling method is: along (coke) charge level top to cupola well lower region
In the short transverse of territory, being a sample plane every 0.5 ~ 1m, each sample plane Shang Qu center and edge totally 4 ~ 5 points,
Sampling schematic diagram is shown in Fig. 1, each some sampling 2 ~ 10kg；Sample position, with air plane datum plane, is expressed as " 0m ", "+" table
Show that more than air plane, "-" represent below air plane.
2, it is dried
In coke specimen is measured stove before the every physical and chemical indexes of residual coke, need to be dried；Drying steps is: will take out
Coke specimen 165 ~ 170 DEG C of temperature conditionss in an oven under dry 2 ~ 2.5h.
3, the every physical and chemical indexes of residual coke in stove is measured
(1) granularity of coke specimen is measured
Weigh the coke quality of each grade of 60mm, 40mm, 20mm, 10mm, 5mm, and contrast with feeding density granularity, analyze height
In stove, coke is in the mass loss of blast furnace regional；
(2) coke apparent porosity is measured
Assay method is: extracts the intrapore gas of coke out, under the effect of atmospheric pressure, makes water be filled into the hole of coke
In, the quality and the same sample that measure water in coke space are submerged in water the quality lost, and then calculate apparent porosity；Air port
The coke apparent porosity of 0.85m area above below plane is about 44%, and feeding density coke apparent porosity is typically about 38%,
-0.85m region below coke apparent porosity reduces further；
(3) proximate analysis of coke
Measure the moisture of coke, ash, volatile matter, and calculate coke fixed carbon content；Coke bosh in blast furnace and lower ash Ad
Content is in the trend of rising, and especially-0.85m region below Ad content is significantly raised, and fixed carbon FCad content is on a declining curve ,-
0.85m region below FCad content is decreased obviously；
Meanwhile, in 0m ,-1m ,-2m aspect, each point FCad content is all that edge is more than center, especially with this phenomenon of-1m aspect
The most obvious；
(4) Coulomb equation is used to measure coke S content；
(5) coke degree of graphitization is measured；
(6) coke ash component measures
In blast furnace, in residual coke ash from top to bottom, various constituent contents change greatly, in the ash of-2m following cupola well region
SiO2, Al2O3, CaO, content of MgO are higher, are closer to the slag composition discharged from ferrum mouth during normal production, ash component alkali
Spend the most identical with basicity of slag when discharging normal production, and differ bigger with feeding density ash component.
4, coke smelting behavior in blast furnace and degradation mechanism are analyzed
(1) be can be seen that blast furnace coke size situation of change from top to bottom, especially-2m region below by coke size measurement result
Coke size is decreased obviously；
(2) from coke apparent porosity, S assay, ash, Determination of Volatile Matter result, coke from bosh bottom to air port
Near zone coke FCad content be have dropped 11% ~ 25% by the 87% of feeding density；Cupola well top, stove is entered below air plane
Slag gradually increases, and penetrates in coke hole, causes the Ad content in coke gradually to increase, and FCad content gradually decreases；In blast furnace
Central temperature is higher than edge, and slag ferrum is at the caused center of reduction, centre and edge FCad content difference；
(4) from the ash component measurement result of coke, owing to a large amount of slag ferrum are trapped in coke gap, residual coke ash in blast furnace
Mainly slag is divided to be trapped in coke hole.
The slag that is detained by coke it can be inferred that, in the slag that bosh bottom initially occurs, SiO2, Al2O3, CaO, MgO contain
Measuring the highest, in first slag, MnO, Fe2O3, P2O5 content is several times even ten times in finishing slag.Enter cupola well region, SiO2 in slag,
CaO content gradually rises, and in slag, dual alkalinity is risen to 1.08 by 0.24.In the slag of cupola well top, content of MgO is up to 12.05%,
Al2O3 content is up to 36.63%, and the most significantly higher than its content in finishing slag, cupola well bottom MgO, Al2O3 content declines, this
It is owing to a large amount of generation of SiO2, CaO causes its content to decline in this region slag, has illustrated that substantial portion of slag making is at cupola well
Bottom is carried out.From the point of view of blast furnace residual coke is detained the analysis of slag, some aspects drawn with blast furnace anatomy experiment is more
It coincide.
Alkali metal K, Na and Zn enrichment phenomenon in blast furnace is more serious, bosh bottom to cupola well upper area, K2O in slag
Content is up to 13.9%, and Na2O content is up to 1.38%, and Zn content 0.40%, is several times even tens times of blast furnace raw material.And
Entering cupola well bottom, in slag, biological cycle content declines by a big margin, and this is consistent with alkali-metal enrichment principle, at cupola well
High-temperature region, bottom partial alkaline-metal element is with silicate patterns precipitated oxide, and another part is then discharged in stove by slag, because of
And reach maximum on cupola well top to cupola well upper area alkali metal enriching quantity, in the slag of cupola well bottom, alkali metal content drops
Low.Meanwhile, the catalytic action of alkali metal STRENGTH ON COKE pyroreaction is understood more greatly in conjunction with this region coke blacking dust quantity in sampling process
Substantially.Be enriched with Circulation of Alkali except that, the cupola well top that is enriched in of Zn reaches maximum, than alkali metal enrichment
Big value value position moves down, and this is that in the slag of cupola well bottom, Zn content is less than 0.01%, and this also prints owing to the boiling point of Zn is higher than K, Na
Demonstrate,prove Zn mainly discharge blast furnace in vapour form from furnace roof discharge rather than discharged by slag.
It should be appreciated that for those of ordinary skills, can be improved according to the above description or be converted,
And all these modifications and variations all should belong to the protection domain of claims of the present invention.
Claims (1)
1. coke evaluation methodology of degradation in blast furnace, the method includes obtaining coke specimen, measuring coke specimen
Every physical and chemical indexes, analyze coke smelting behavior in blast furnace and degradation mechanism according to every physical and chemical indexes, its feature exists
Step in described acquirement coke specimen is: after blast furnace stopping damping down, start, from furnace roof, cooling of fetching water, when salvage stores in blast furnace
Surface temperature is down to when less than 50 DEG C start sampling；On charge level top to cupola well lower area short transverse, with every 0.5 ~
1m is a sample plane, takes a little at the center of each sample plane and edge, each some sampling 2 ~ 10kg.
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Cited By (7)
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| CN107860680A (en) * | 2017-12-19 | 2018-03-30 | 武汉钢铁有限公司 | A kind of blast-furnace tuyere Jiao granularmetric composition and the analysis method of slag hold-up |
| CN108676944A (en) * | 2018-05-11 | 2018-10-19 | 武汉钢铁有限公司 | A kind of coke degradation degree evaluation method in blast furnace |
| CN109487022A (en) * | 2018-12-21 | 2019-03-19 | 鞍钢集团朝阳钢铁有限公司 | A kind of method for operating blast furnace |
| CN113718072A (en) * | 2021-09-15 | 2021-11-30 | 鞍钢股份有限公司 | Method for distinguishing coke state in blast furnace |
| CN114606354A (en) * | 2022-03-31 | 2022-06-10 | 鞍钢股份有限公司 | Method for analyzing tuyere raceway height by means of hearth sampling |
| CN114752717A (en) * | 2022-03-31 | 2022-07-15 | 鞍钢股份有限公司 | Method for analyzing tuyere raceway width by means of hearth sampling |
| CN114908202A (en) * | 2022-04-27 | 2022-08-16 | 鞍钢股份有限公司 | Method for calculating size of active area of integral hearth by utilizing hearth sampling means |
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| CN107860680A (en) * | 2017-12-19 | 2018-03-30 | 武汉钢铁有限公司 | A kind of blast-furnace tuyere Jiao granularmetric composition and the analysis method of slag hold-up |
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| CN109487022A (en) * | 2018-12-21 | 2019-03-19 | 鞍钢集团朝阳钢铁有限公司 | A kind of method for operating blast furnace |
| CN113718072A (en) * | 2021-09-15 | 2021-11-30 | 鞍钢股份有限公司 | Method for distinguishing coke state in blast furnace |
| CN114606354A (en) * | 2022-03-31 | 2022-06-10 | 鞍钢股份有限公司 | Method for analyzing tuyere raceway height by means of hearth sampling |
| CN114752717A (en) * | 2022-03-31 | 2022-07-15 | 鞍钢股份有限公司 | Method for analyzing tuyere raceway width by means of hearth sampling |
| CN114752717B (en) * | 2022-03-31 | 2023-03-17 | 鞍钢股份有限公司 | Method for analyzing tuyere raceway width by means of hearth sampling |
| CN114606354B (en) * | 2022-03-31 | 2023-03-17 | 鞍钢股份有限公司 | Method for analyzing tuyere raceway height by means of hearth sampling |
| CN114908202A (en) * | 2022-04-27 | 2022-08-16 | 鞍钢股份有限公司 | Method for calculating size of active area of integral hearth by utilizing hearth sampling means |
| CN114908202B (en) * | 2022-04-27 | 2023-03-17 | 鞍钢股份有限公司 | Method for calculating size of active area of integral hearth by utilizing hearth sampling means |
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Effective date of registration: 20170703 Address after: 430083 Gate No. 2, Qingshan District, Hubei, Wuhan Applicant after: Wuhan iron and Steel Company Limited Address before: 430083 Wuhan factory in Hubei Province before the door No. 2 Applicant before: WUHAN IRON AND STEEL CORPORATION |
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Application publication date: 20161221 |
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