CN106767611A - A kind of assay method of COREX melting gasification furnaces Tuyere Raceway length - Google Patents
A kind of assay method of COREX melting gasification furnaces Tuyere Raceway length Download PDFInfo
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- CN106767611A CN106767611A CN201611129292.4A CN201611129292A CN106767611A CN 106767611 A CN106767611 A CN 106767611A CN 201611129292 A CN201611129292 A CN 201611129292A CN 106767611 A CN106767611 A CN 106767611A
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- air port
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- 238000002309 gasification Methods 0.000 title claims abstract description 41
- 238000002844 melting Methods 0.000 title claims abstract description 41
- 230000008018 melting Effects 0.000 title claims abstract description 41
- 238000003556 assay Methods 0.000 title claims abstract description 14
- 239000000571 coke Substances 0.000 claims abstract description 111
- 238000010586 diagram Methods 0.000 claims abstract description 12
- 235000019580 granularity Nutrition 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000008187 granular material Substances 0.000 claims description 14
- 239000002245 particle Substances 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000012467 final product Substances 0.000 claims description 3
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 16
- 238000004519 manufacturing process Methods 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008202 granule composition Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B11/00—Making pig-iron other than in blast furnaces
- C21B11/02—Making pig-iron other than in blast furnaces in low shaft furnaces or shaft furnaces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
Abstract
The present invention relates to a kind of assay method of COREX melting gasification furnaces Tuyere Raceway length, comprise the following steps：1) sample；2) voidage of diverse location air port coke specimen is calculated；3) as abscissa, the voidage with air port coke specimen draws coordinate diagram to the distance with sample point away from air port as ordinate；4) in coordinate diagram there is a catastrophe point in the voidage of air port coke specimen, and the distance between the catastrophe point correspondence position and air port are COREX melting gasification furnace Tuyere Raceway length.The present invention calculates COREX melting gasification furnace convolution region lengths by measuring the voidage of air port coke specimen, and method is simple and easy to apply, accurately and reliably, can be used as the foundation for judging the COREX melting gasification furnace working of a furnaces.
Description
Technical field
It is long the present invention relates to non-blast furnace ironmaking technical field, more particularly to a kind of COREX melting gasification furnaces Tuyere Raceway
The assay method of degree.
Background technology
Blast furnace iron-making process has the advantages that many other ironmaking equipments are incomparable, such as production scale is big, production efficiency is high,
Energy consumption is low, long service life, desulfurization performance are good and is suitable for production hot metal in steelmaking etc., therefore up to the present always as refining
The main production of iron.But blast furnace ironmaking there is also many unfavorable factors, and such as scale of investment is big, environmental pollution is serious, raw
Produce dumb etc., particularly its STRENGTH ON COKE production heavy dependence；The raising required with Environmental protection and coking coal resource
Worsening shortages, to use no or little coke and low CO2The non-blast furnace ironmaking technique of discharge is increasingly paid attention to, but at present only
The COREX techniques for having VAI to develop are unique new technologies for successfully realizing industrialized production in ironmaking technique of fusion and reduction.
The capital equipment of COREX iron-smelting process is reduction shaft furnace and melting gasification furnace, and melting gasification furnace cupola well is circumferentially
Direction sets multiple air ports, for normal temperature pure oxygen is sprayed into stove, occurring with semicoke after oxygen penetrating melting gasification furnace violent
Combustion reaction generates reducing gas, therefore the shape of melting gasification furnace Tuyere Raceway is to determine COREX stove smelters with size
Skill direct motion whether key factor.
Scientific worker both domestic and external has carried out substantial amounts of research to In Raceway Before Tuyere of Blast Furnace, wherein for convolution region length
Assay method have a lot, such as use microwave transmitting antenna, microwave signal is sent in blast-furnace tuyere from blast furnace tuyere monitoring hole
Raceway zone, then echo-signal is received by microwave transmitting antenna, after sending microwave transmitter to convert, then send microwave signal process device to enter
Row treatment, is then received and is further processed into picture by display, final to obtain raceway zone depth data in blast-furnace tuyere；Or
The range data that microwave measuring instrument is measured is changed into by coordinate data by three-dimensional imaging computer, and is fitted according to coordinate data
The 3-D view of dead stock column in into area, and then realize the measurement to Blast Furnace Raceway depth.But up to the present, for COREX
The research of melting gasification furnace Tuyere Raceway is also little, the measuring method of its convolution region length is even more and is rarely reported；And it is above-mentioned
The equipment used in method is generally expensive, also less outfit in blast fumance.
The content of the invention
The invention provides a kind of assay method of COREX melting gasification furnaces Tuyere Raceway length, by measuring air port
The voidage of coke specimen calculates COREX melting gasification furnace convolution region lengths, and method is simple and easy to apply, accurately and reliably, can conduct
Judge the foundation of the COREX melting gasification furnace working of a furnaces.
In order to achieve the above object, the present invention is realized using following technical scheme：
A kind of assay method of COREX melting gasification furnaces Tuyere Raceway length, comprises the following steps：
1) sample；On the central plane of COREX melting gasification furnaces air port, along the radial direction of COREX melting gasification furnaces, from air port
Air port coke specimen is taken by tuyere p robing device respectively to COREX melting gasification furnaces center diverse location, and by acquired wind
Mouth coke specimen is numbered；
2) voidage of diverse location air port coke specimen is calculated, the voidage of air port coke specimen refers to whole granularities
Voidage；
3) distance with sample point away from air port as abscissa, as ordinate draw and sit by the voidage with air port coke specimen
Mark on a map；
4) step 3) in the coordinate diagram drawn, there is a catastrophe point, the catastrophe point in the voidage of air port coke specimen
The distance between correspondence position and air port are COREX melting gasification furnace Tuyere Raceway length；Circular is：
Sample point position as corresponding to the catastrophe point of the hollow porosity of coordinate diagram determines it, the position is on tuyere p robing device
The longitudinal center position of corresponding sample groove；The corresponding sample point position of voidage catastrophe point is sampled into slot length plus 1/2, as
COREX melting gasification furnace Tuyere Raceway length.
The specific assay method of the air port coke specimen voidage is as follows：
1) before air port coke specimen voidage is determined, first sieved, the selection wherein coke of granularity >=2.5mm
Particle group coke sample, coke specimen soaks more than 24h in water, is completely filled with the stomata for making coke in coke specimen
Water；Comprise the following steps that：
(1) measured quantity body product；
Pallet is placed on balance, is reset；Claim first measuring device weight；Then by measuring device topped up with water after, claim to obtain measuring device
With the weight of water；The difference of weight obtains final product the volume of measuring device divided by the density of water twice；
According to measuring device weight mAmount, topped up with water measuring device weight mIt is fullWith the proportion ρ of waterWater, amount of calculation body product：
(2) char volume, voidage are determined；
After coke specimen after immersion is drained, it is fitted into measuring device and is compacted, measuring device weight of the record equipped with coke specimen
ma；Whole coke specimens are just flooded to being added water in the measuring device equipped with coke specimen, record measuring device weight m nowb；According to
VAmount、ma、mb, calculate volume shared by coke specimen particulate interspaces：
Added water until filling it up with, record measuring device weight m now to measuring device relaying is continuousc；According to VAmount、maAnd mc, calculate coke examination
Sample volume：
According to VIt is emptyAnd VIt is burnt, calculate the voidage ε that coke specimen is the air port coke granule of granularity >=2.5mmDetermine：
(3) voidage of air port coke specimen whole granularity is calculated；
, it is necessary to consider the influence of granularity ＜ 2.5mm coke granules when calculating the voidage of air port coke specimen whole granularity,
Therefore, the voidage ε of air port coke specimen whole granularity is calculated as follows：
εWhole particles of calculating=(1- χ %) × εDetermine-- formula 5
In formula, εWhole particles of calculatingRepresent the voidage of air port coke specimen whole granularity；χ % represent granularity ＜ 2.5mm coke
The percentage composition of particle.
Compared with prior art, the beneficial effects of the invention are as follows：
1) assay method is simple, easy to operate, it is easy to implement；
2) measurement result accurately and reliably, can as judge the production of COREX melting gasification furnaces whether the foundation of direct motion.
Brief description of the drawings
Fig. 1 is the schematic diagram of sampling process of the present invention.
Fig. 2 is the coordinate diagram in the embodiment of the present invention.
In figure：The sampling groove of 2. air port of 1.COREX melting gasification furnaces, 3. tuyere p robing groove 4.
Specific embodiment
Specific embodiment of the invention is described further below in conjunction with the accompanying drawings：
A kind of assay method of COREX melting gasification furnaces Tuyere Raceway length of the present invention, comprises the following steps：
1) sample；As shown in figure 1, on the central plane of COREX melting gasification furnaces air port 2, along COREX melting gasification furnaces 1
Radial direction, air port coke is taken by tuyere p robing device 3 respectively from air port 2 to the center diverse location of COREX melting gasification furnaces 1 and is tried
Sample, and acquired air port coke specimen is numbered；
2) voidage of diverse location air port coke specimen is calculated, the voidage of air port coke specimen refers to whole granularities
Voidage；
3) distance with sample point away from air port as abscissa, as ordinate draw and sit by the voidage with air port coke specimen
Mark on a map；
4) step 3) in the coordinate diagram drawn, there is a catastrophe point, the catastrophe point in the voidage of air port coke specimen
The distance between correspondence position and air port 2 are COREX melting gasification furnace Tuyere Raceway length；Circular is：
Sample point position as corresponding to the catastrophe point of the hollow porosity of coordinate diagram determines it, the position is tuyere p robing device 3
The longitudinal center position of upper corresponding sample groove 4；The corresponding sample point position of voidage catastrophe point is added into the length of 1/2 sampling groove 4,
As COREX melting gasification furnaces Tuyere Raceway length.
The specific assay method of the air port coke specimen voidage is as follows：
1) before air port coke specimen voidage is determined, first sieved, the selection wherein coke of granularity >=2.5mm
Particle group coke sample, coke specimen soaks more than 24h in water, is completely filled with the stomata for making coke in coke specimen
Water；Comprise the following steps that：
(1) measured quantity body product；
Pallet is placed on balance, is reset；Claim first measuring device weight；Then by measuring device topped up with water after, claim to obtain measuring device
With the weight of water；The difference of weight obtains final product the volume of measuring device divided by the density of water twice；
According to measuring device weight mAmount, topped up with water measuring device weight mIt is fullWith the proportion ρ of waterWater, amount of calculation body product：
(2) char volume, voidage are determined；
After coke specimen after immersion is drained, it is fitted into measuring device and is compacted, measuring device weight of the record equipped with coke specimen
ma；Whole coke specimens are just flooded to being added water in the measuring device equipped with coke specimen, record measuring device weight m nowb；According to
VAmount、ma、mb, calculate volume shared by coke specimen particulate interspaces：
Added water until filling it up with, record measuring device weight m now to measuring device relaying is continuousc；According to VAmount、maAnd mc, calculate coke examination
Sample volume：
According to VIt is emptyAnd VIt is burnt, calculate the voidage ε that coke specimen is the air port coke granule of granularity >=2.5mmDetermine：
(3) voidage of air port coke specimen whole granularity is calculated；
, it is necessary to consider the influence of granularity ＜ 2.5mm coke granules when calculating the voidage of air port coke specimen whole granularity,
Therefore, the voidage ε of air port coke specimen whole granularity is calculated as follows：
εWhole particles of calculating=(1- χ %) × εDetermine-- formula 5
In formula, εWhole particles of calculatingRepresent the voidage of air port coke specimen whole granularity；χ % represent granularity ＜ 2.5mm coke
The percentage composition of particle.
Following examples are implemented under premised on technical solution of the present invention, give detailed implementation method and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
Do not mentionlet alone and bright be conventional method.
【Embodiment】
As shown in figure 1, in the present embodiment, sampling process is the edge on the central plane of COREX melting gasification furnaces air port 2
The radial direction of COREX melting gasification furnaces 1, is sampled from air port 2 to the center of COREX melting gasification furnaces 1 using tuyere p robing device 3,
The tuyere p robing machine that tuyere p robing device is developed using Baosteel, its sampling end is tubulose, is provided with multiple sampling grooves 4 along longitudinal direction thereon,
Once multiple sample points can be sampled；The length of sampling groove 4 is L.
In the present embodiment, 5 groups of acquired air port coke specimen number consecutivelies are 1#~5#, and corresponding sample point is away from air port
Distance respectively S1=0.25m；S2=0.75m；S3=1.25m；S4=1.75m；S5=2.25m.
5 groups of voidages of whole granularities of air port coke specimen are calculated by the method for the invention, result of calculation see the table below：
It is according to Archimedes principle, in known vessel volume, by being added that the voidage of air port coke specimen is determined
Air port coke specimen excludes consubstantiality ponding and determines its proportion and voidage.
There is certain hole on coke granule surface, during being reached before air port from after furnace roof addition, coke surface hole
Degree diminishes.Because granularity ＜ 2.5mm coke granules can float and are together lost with water on the water surface in voidage continuous mode, in addition
" and mud " phenomenon may occur, therefore only selection minimum particle size is the coke granule composition coke examination of 2.5mm in continuous mode
Sample.But due to containing more fine powder in the coke granule of granularity ＜ 2.5mm, can be several by the space between coke granule
It is fully filled with so that almost without space in the coke granule of granularity ＜ 2.5mm, so as to be affected greatly to the working of a furnace.Cause
This, the measure of air port coke specimen voidage still will consider the influence of the coke granule of granularity ＜ 2.5mm, and this is also regulation wind
The reason for mouth coke specimen voidage is whole granularity voidages.
As abscissa, the voidage with air port coke specimen draws coordinate to distance with sample point away from air port as ordinate
Figure is as shown in Figure 2；
As can be seen that S from coordinate diagram1Respective coordinates point and S2The line of respective coordinates point is one close to horizontal straight
Line, S3Respective coordinates point and S4、S5The line of respective coordinates point is also similar to a straight line for level, and S2Respective coordinates point and S3
Exist between respective coordinates point and obvious dashing forward is occurred in that between larger drop, i.e. 2# air ports coke specimen and 3# air ports coke specimen
Height, shows that the coke voidage in the coke specimen of air port there occurs mutation.This is because coke is in COREX melting gasification furnaces 1
Interior different apart from the position of air port 2, it is caused the voidage of coke to exist by blowing oxygen and the degree difference reacted with oxygen
Difference.The measurement accuracy of the catastrophe point is determined by the sampling precision of tuyere p robing device.
In the present embodiment, coke specimen corresponding sample point in 2# air ports is apart from air port S2=0.75m, the length L of sampling groove 4 are
COREX melting gasification furnaces Tuyere Raceway length is in 0.30m, therefore the present embodiment：
S2+ L/2=(0.75+0.15) m=0.90m.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technology according to the present invention scheme and its
Inventive concept is subject to equivalent or change, should all be included within the scope of the present invention.
Claims (2)
1. a kind of assay method of COREX melting gasification furnaces Tuyere Raceway length, it is characterised in that comprise the following steps：
1) sample；On the central plane of COREX melting gasification furnaces air port, along the radial direction of COREX melting gasification furnaces, from air port extremely
COREX melting gasification furnaces center diverse location takes air port coke specimen respectively by tuyere p robing device, and by acquired air port
Coke specimen is numbered；
2) voidage of diverse location air port coke specimen is calculated, the voidage of air port coke specimen refers to the space of whole granularities
Degree；
3) as abscissa, the voidage with air port coke specimen draws coordinate diagram to the distance with sample point away from air port as ordinate；
4) step 3) in the coordinate diagram drawn, there is a catastrophe point, catastrophe point correspondence in the voidage of air port coke specimen
The distance between position and air port are COREX melting gasification furnace Tuyere Raceway length；Circular is：
Sample point position as corresponding to the catastrophe point of the hollow porosity of coordinate diagram determines it, the position is correspondence on tuyere p robing device
The longitudinal center position of sampling groove；The corresponding sample point position of voidage catastrophe point is sampled into slot length plus 1/2, as
COREX melting gasification furnace Tuyere Raceway length.
2. a kind of assay method of COREX melting gasification furnaces Tuyere Raceway length according to claim 1, its feature exists
In the specific assay method of the air port coke specimen voidage is as follows：
1) before air port coke specimen voidage is determined, first sieved, the selection wherein coke granule of granularity >=2.5mm
Composition coke specimen, coke specimen soaks more than 24h in water, water is completely filled with the stomata for making coke in coke specimen；Tool
Body step is as follows：
(1) measured quantity body product；
Pallet is placed on balance, is reset；Claim first measuring device weight；Then by measuring device topped up with water after, claim to obtain measuring device and water
Weight；The difference of weight obtains final product the volume of measuring device divided by the density of water twice；
According to measuring device weight mAmount, topped up with water measuring device weight mIt is fullWith the proportion ρ of waterWater, amount of calculation body product：
(2) char volume, voidage are determined；
After coke specimen after immersion is drained, it is fitted into measuring device and is compacted, measuring device weight m of the record equipped with coke specimena；To
Added water in measuring device equipped with coke specimen and just flood whole coke specimens, record measuring device weight m nowb；Measured according to V,
ma、mb, calculate volume shared by coke specimen particulate interspaces：
Added water until filling it up with, record measuring device weight m now to measuring device relaying is continuousc；According to VAmount、maAnd mc, calculate coke specimen body
Product：
According to VIt is emptyAnd VIt is burnt, calculate the voidage ε that coke specimen is the air port coke granule of granularity >=2.5mmDetermine：
(3) voidage of air port coke specimen whole granularity is calculated；
, it is necessary to consider the influence of granularity ＜ 2.5mm coke granules when calculating the voidage of air port coke specimen whole granularity, because
This, the voidage ε of air port coke specimen whole granularity is calculated as follows：
εWhole particles of calculating=(1- χ %) × εDetermine-- formula 5
In formula, εWhole particles of calculatingRepresent the voidage of air port coke specimen whole granularity；χ % represent granularity ＜ 2.5mm coke granules
Percentage composition.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62257004A (en) * | 1986-04-30 | 1987-11-09 | Nippon Steel Corp | Method for detecting eroded state of furnace floor wall of shaft furnace |
| CN101121949A (en) * | 2007-09-24 | 2008-02-13 | 北京科技大学 | Method for measuring blast furnace convolution region length |
| CN102443667A (en) * | 2011-12-07 | 2012-05-09 | 首钢总公司 | Sampling and measuring device for tuyere raceway |
| WO2014009367A1 (en) * | 2012-07-13 | 2014-01-16 | Centre de Recherches Métallurgiques asbl - Centrum voor Research in de Metallurgie vzw | Method and device for measuring levels of cast-iron and slag in a blast furnace |
| CN204022856U (en) * | 2014-06-06 | 2014-12-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of In Raceway Before Tuyere of Blast Furnace length-measuring appliance |
-
2016
- 2016-12-09 CN CN201611129292.4A patent/CN106767611A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62257004A (en) * | 1986-04-30 | 1987-11-09 | Nippon Steel Corp | Method for detecting eroded state of furnace floor wall of shaft furnace |
| CN101121949A (en) * | 2007-09-24 | 2008-02-13 | 北京科技大学 | Method for measuring blast furnace convolution region length |
| CN102443667A (en) * | 2011-12-07 | 2012-05-09 | 首钢总公司 | Sampling and measuring device for tuyere raceway |
| WO2014009367A1 (en) * | 2012-07-13 | 2014-01-16 | Centre de Recherches Métallurgiques asbl - Centrum voor Research in de Metallurgie vzw | Method and device for measuring levels of cast-iron and slag in a blast furnace |
| CN204022856U (en) * | 2014-06-06 | 2014-12-17 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of In Raceway Before Tuyere of Blast Furnace length-measuring appliance |
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