CN107860680A - A kind of blast-furnace tuyere Jiao granularmetric composition and the analysis method of slag hold-up - Google Patents
A kind of blast-furnace tuyere Jiao granularmetric composition and the analysis method of slag hold-up Download PDFInfo
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Abstract
The invention belongs to technical field of blast furnace ironmaking, and in particular to the analysis method of a kind of blast-furnace tuyere Jiao granularmetric composition and slag hold-up, comprise the following steps：Blast furnace staying takes coke to dry；Peel off the slag and iron on air port Jiao surface；Weigh the slag amount w collected1；The burnt volume V in size fractionated air port is obtained by volumetric method1、V2、V3、V4、V5；So as to analyze to obtain the burnt granularmetric composition in air port；The burnt cumulative volume in air port is multiplied by coke apparent density and obtains air port Jiao's mass W2, W1/W2The as hold-up of slag.The present invention can accurately represent the burnt granularmetric composition in air port；It is not required to peel off the iron for being difficult to peel off on air port Jiao surface by hand, it is easy to accomplish and it is accurate；Suitable for volume 3000m3Blast fumance application above, the air port Jiao's size distribution and the hold-up of slag obtained according to analysis, can further adjust the raw material adapted scheme such as coking coal and ore, blast furnace stable smooth operation.
Description
Technical field
The invention belongs to technical field of blast furnace ironmaking, and in particular to a kind of blast-furnace tuyere Jiao granularmetric composition and slag hold-up
Analysis method.
Background technology
Coke is from blast furnace is loaded until the process for completing to smelt is a process progressively deteriorated.In lump zone, coke
Mainly by mechanical collision, extruding, friction effect, the lumpiness of coke is declined slightly, but unobvious；Melting dropping zone has been arrived by height
Warm mechanical function and CO2Acted on Deng gasification reaction, coke-blowhole wall is thinning, the porosity increases, granularity reduces, intensity declines simultaneously
Progressively efflorescence so that the gas permeability of blast furnace stock column is deteriorated.Melting drippage region is the key area of deterioration, and coke is in this area
Can domain degradation will be directly connected to blast furnace ironmaking process direct motion.In addition, in blast furnace ironmaking process, with raw material down
Temperature rise is walked, the relatively low material of fusing point progressively melts to form blast-furnace slag.Clinker passes through coke among cohesive zone and cupola well,
Few in coke layer hold-up if slag fluidity is good, blast furnace is ventilative to act charitably, smooth operation of furnace.Therefore, by blast-furnace tuyere
Studying to understand the requirement of blast furnace process Coke Quality for burnt deterioration condition, meets blast furnace process need to instruct coke production
Will；By understand air port region slag hold-up number, it can be determined that whether ore composition suitable, in time regulation ore
Proportioning provide instruction.
Domestic major steel mill such as Baosteel, Shoudu Iron and Steel Co, Wuhan Iron and Steel Plant, Ma Gang, Baogang, climb steel etc. and carried out the burnt sampling in air port and granularity
Composition analysis.The conventional method of air port char particle degree composition analysis is：Using artificial method, air port Jiao's table is peeled off with pocket knife by hand
The slag iron in face, then selection standard classifying screen is by the burnt progress grading in air port, then weighs the matter for taking each grade air port burnt in the balance
Amount, calculate the burnt mass percent in each grade air port and represent the burnt granularmetric composition in air port.The above method is disadvantageous in that wind
The iron of the burnt surface adhesion of mouth is largely penetrated into air port Jiao surface and stomata, and iron and Jiao are combined together, and pocket knife is used by hand using people
The method of stripping need to consume more manpower and time cost, and can not possibly separate completely, and the density of iron is 7.8g/cm3, coke
Apparent density is about 0.9g/cm3, and iron the weighing for STRENGTH ON COKE of meeting not being kept completely separate causes relatively large deviation.Patent CN106154868A
A kind of blast-furnace tuyere coke size hierarchical control method is disclosed, mechanical grading classification is carried out to blast-furnace tuyere coke, measures each grain
Degree rank coke accounts for the percentage of coke gross mass.Solution is weight method, passes through body shared by iron in micro- sem observation coke
Product percentage, then subtract the weight of iron.But the problem of sample representation be present, coke used in film-making only accounts for air port Jiao's very little
A part, error may be caused.And with precision instrument microscope, the iron ore itself come in coke by ribbing is to measurement result
There is certain interference.
The content of the invention
The defects of in order to overcome prior art, the purpose of the present invention are the errors for avoiding the burnt each grade quality in air port from weighing,
It is not required to peel off the close iron of air port Jiao's surface adhesion by hand, you can realize the accurate control to blast-furnace tuyere coke size, pass through
Slag hold-up judges the suitability of its mobility and raw ore proportioning.
To achieve the above object, the present invention provides the analysis method of a kind of blast-furnace tuyere Jiao granularmetric composition and slag hold-up,
It is as follows including step：
1) coke of bosh radial direction inlet horizontal is taken out during blast furnace staying with tuyere p robing machine, carries out drying and processing；
2) slag and iron of air port Jiao's surface porosity are peeled off using artificial pocket knife, slag and iron are separated with magnet, slag is collected
Get up to weigh, the record quantity of slag is w1；
3) by above-mentioned steps 2) stripping is scaling-off and part iron air port Jiao is sieved into ＞ d with standard grading1mm、d1~d2mm、
d2~d3mm、d3~d4mm、d4~d5Mm, ＜ d5Mm grade；
4) bituminous coal particle is loaded in the iron ware for having volume scale, the amount of bituminous coal particle will meet each grade air port
Jiao is flooded completely；
5) the volume V of initial bituminous coal particle in iron ware is write down0, it is put into ＞ d1Mm air ports Jiao is allowed to complete by bituminous coal particle
Total flooding, write down the now burnt volume and V with bituminous coal particle in air port01, by V01V0Obtain ＞ d1The burnt volume V in mm grades air port1；
6) according to above-mentioned steps 5) method, write down bituminous coal before being put into air port Jiao of size fractionated in iron ware every time
The initial volume of particle, be put into size fractionated air port it is defocused write down air port burnt and the volume of bituminous coal particle and, it is then burnt with air port
Volume and the initial volume for subtracting bituminous coal particle with bituminous coal particle, respectively obtain ＞ d1mm、d1~d2mm、d2~d3mm、d3~
d4Mm, d4~d5mm, ＜ d5The burnt volume V in mm grades air port1、V2、V3、V4And V5；
7) the burnt granularmetric composition in air port is represented using following calculation respectively：
V1* 100%/(V1+V2+V3+V4+V5)、V2* 100%/(V1+V2+V3+V4+V5)、V3* 100%/(V1+V2+V3+V4+
V5)、V4* 100%/(V1+V2+V3+V4+ V5) and V5* 100%/(V1+V2+V3+V4+V5)；
8) with air port Jiao's volume and it is multiplied by coke apparent density and obtains air port Jiao's mass w2, quantity of slag w1Divided by air port Jiao's mass w2
Obtain the hold-up of slag.
Specifically, the coke that the step 1) is taken out is put into baking oven and dried 2 hours at a temperature of 175 ± 2 DEG C.
Specifically, the granularity of the bituminous coal particle is 0.3~0.5mm, moisture is less than 2%.
The beneficial effects of the invention are as follows：1) because the iron of air port Jiao's surface adhesion influences very little, profit to the burnt volume in air port
Cubing is carried out in the container for having volume scale with size fractionated air port Jiao with the granularity bituminous coal particle burnt much smaller than air port,
Percent by volume is converted into mass percent again, the method for cubing is easy, and the mass percent finally given is more defined
Really；2) slag and iron of air port Jiao's surface porosity need to be only peeled off by hand, be not required to peel off the iron for being difficult to peel off on air port Jiao surface by hand,
It is easily achieved and accurately；3) the technical program is applied to volume 3000m3Blast fumance application above, can be obtained according to analysis
Air port Jiao's size distribution, and the hold-up for the slag being calculated by air port Jiao's volumetric method, further adjust coking coal and ore deposit
The raw material adapted scheme such as stone, blast furnace stable smooth operation.
Embodiment
The invention will be further elaborated by the following examples, but does not limit the present invention.It is every without departing substantially from the present invention
The change of design or equivalent substitute are included within protection scope of the present invention.Present embodiment is only the best example,
Not to the restricted implementation of technical solution of the present invention.
With 3200m3Exemplified by volume blast furnace, point of blast-furnace tuyere Jiao granularmetric composition and slag hold-up is followed the steps below
Analysis.
1) 1.5 meters are stretched into stove along furnace wall to combustion chamber direction using tuyere p robing machine, to certain enterprise 3200m3Volume blast furnace
Sample in damping down, sample 3 times altogether, air port Jiao taken out every time is put into experiment steel drum, and each sample is used immediately after taking out
Wet cotton covering；
2) the air port Jiao's sample taken transports laboratory back, and coke individual layer is placed in stainless steel pallet, be put into baking oven 175 ±
Dried 2 hours at a temperature of 2 DEG C；
3) slag and iron of air port Jiao's surface porosity are peeled off with pocket knife by hand using people, is separated slag and iron with suction is ferromagnetic,
Slag is collected and weighed, the record quantity of slag is w1For 1.57kg；
4) will peel off scaling-off and air port Jiao of part iron with standard grading be sieved into ＞ 40mm, 40~25mm, 25~20mm,
The grades such as 20~6mm, ＜ 6mm；
5) bituminous coal of a certain amount of 0.3~0.5mm of granularity, moisture less than 2% is loaded in the iron ware for having volume scale
Particle, the amount of bituminous coal particle will meet completely to flood each grade air port Jiao；
6) the volume V of initial bituminous coal particle in iron ware is write down0, it is put into ＞ 40mm air port Jiao and is allowed to complete by bituminous coal particle
Total flooding, write down the now burnt volume and V with bituminous coal particle in air port01, by V01-V0Obtain the burnt volume in ＞ 40mm grades air port
V1；
7) according to above-mentioned steps, the first of bituminous coal particle is write down before being put into air port Jiao of size fractionated in iron ware every time
Initial body accumulates, be put into size fractionated air port it is defocused write down air port burnt and the volume of bituminous coal particle and, then with air port is burnt and bituminous coal
The volume of grain and the initial volume for subtracting bituminous coal particle, obtain the burnt volume V in size fractionated air port1、V2、V3、V4、V5；
8) the burnt granularmetric composition in air port is represented using following calculation respectively：
V1* 100%/(V1+V2+V3+V4+V5)、V2* 100%/(V1+V2+V3+V4+V5)、V3* 100%/(V1+V2+V3+V4+
V5)、V4* 100%/(V1+V2+V3+V4+ V5) and V5* 100%/(V1+V2+V3+V4+V5)；
9) with air port Jiao's volume and being multiplied by coke apparent density 0.9g/cm3Obtain air port Jiao's gross mass w2, quantity of slag w1Divided by wind
The burnt quality w of mouth2Obtain the hold-up of slag.
The analysis result of each grade air port Jiao's granularmetric composition and slag hold-up see the table below 1.
Each grade air port Jiao's granularmetric composition of table 1 and the analysis of slag hold-up
Obtained by this technology method, certain enterprise 3200m3Volume blast-furnace tuyere Jiao ＞ 40mm, 40~25mm, 25~20mm,
The grade percents by volume such as 20~6mm, ＜ 6mm are respectively 3.15%, 13.24%, 17.69%, 63.57%, 2.35%, wherein
More than 65% is up to less than 20mm grade ratios, thus judges that blast furnace feeding coke strenth is relatively low, it is impossible to it is suitable to meet that blast furnace is stablized
OK, take immediate steps, increase strong cohesiveness Blending of Coking Coals 3%；Obtained by this technology method, certain enterprise 3200m3Volume blast furnace
The hold-up of slag reaches 10.76% in Jiao of air port, thus judges the illiquidity of slag, takes immediate steps, and reduces high aluminium ore
Stone proportioning 3%.Two measures are taken, and avoid blast furnace fluctuation, blast furnace fuel is than stable below 510kg/t iron.
And use the technical scheme of conventional weight method to judge the problem of feeding density and ore are present, can not be timely
Technical measures are taken to avoid blast furnace from fluctuating, blast furnace fluctuation causes fuel consumption big, and blast furnace fuel ratio is more than 515kg/t iron.
Claims (3)
1. a kind of blast-furnace tuyere Jiao granularmetric composition and the analysis method of slag hold-up, it is characterised in that：It is as follows including step：
1) coke of bosh radial direction inlet horizontal is taken out during blast furnace staying with tuyere p robing machine, carries out drying and processing；
2) slag and iron of air port Jiao's surface porosity are peeled off using artificial pocket knife, slag and iron are separated with magnet, slag is collected
Weigh, the record quantity of slag is w1；
3) by above-mentioned steps 2) stripping is scaling-off and part iron air port Jiao is sieved into ＞ d with standard grading1mm、d1~d2mm、d2~
d3mm、d3~d4mm、d4~d5Mm, ＜ d5Mm grade；
4) bituminous coal particle is loaded in the iron ware for having volume scale, the amount of bituminous coal particle will meet each grade air port Jiao is complete
Total flooding；
5) the volume V of initial bituminous coal particle in iron ware is write down0, it is put into ＞ d1Mm air ports Jiao is allowed to be flooded completely by bituminous coal particle
Not yet, the now burnt volume and V with bituminous coal particle in air port is write down01, by V01V0Obtain ＞ d1The burnt volume V in mm grades air port1；
6) according to above-mentioned steps 5) method, write down bituminous coal particle before being put into air port Jiao of size fractionated in iron ware every time
Initial volume, be put into size fractionated air port it is defocused write down air port burnt and the volume of bituminous coal particle and, then with air port is burnt and cigarette
The volume of coal particle and the initial volume for subtracting bituminous coal particle, respectively obtain ＞ d1mm、d1~d2mm、d2~d3mm、d3~d4mm、
D4~d5mm, ＜ d5The burnt volume V in mm grades air port1、V2、V3、V4And V5；
7) the burnt granularmetric composition in air port is represented using following calculation respectively：V1* 100%/(V1+V2+V3+V4+V5)、V2*
100%/(V1+V2+V3+V4+V5)、V3* 100%/(V1+V2+V3+V4+V5)、V4* 100%/(V1+V2+V3+V4+ V5) and V5*
100%/(V1+V2+V3+V4+V5)；
8) with air port Jiao's volume and it is multiplied by coke apparent density and obtains air port Jiao's mass w2, quantity of slag w1Divided by air port Jiao's mass w2Obtain
The hold-up of slag.
2. blast-furnace tuyere Jiao granularmetric composition according to claim 1 and the analysis method of slag hold-up, it is characterised in that：Institute
The coke for stating step 1) taking-up is put into baking oven and dried 2 hours at a temperature of 175 ± 2 DEG C.
3. blast-furnace tuyere Jiao granularmetric composition according to claim 1 and the analysis method of slag hold-up, it is characterised in that：Institute
The granularity for stating bituminous coal particle is 0.3~0.5mm, and moisture is less than 2%.
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| CN115326657A (en) * | 2022-10-14 | 2022-11-11 | 北京科技大学 | Non-blowing-out blast furnace coke granularity degradation online monitoring and evaluation method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115326657A (en) * | 2022-10-14 | 2022-11-11 | 北京科技大学 | Non-blowing-out blast furnace coke granularity degradation online monitoring and evaluation method and system |
| CN115326657B (en) * | 2022-10-14 | 2023-01-17 | 北京科技大学 | Non-blowing-out blast furnace coke granularity degradation online monitoring and evaluation method and system |
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