CN104704131A - Reducing gas blowing apparatus for fluidized reduction furnace - Google Patents
Reducing gas blowing apparatus for fluidized reduction furnace Download PDFInfo
- Publication number
- CN104704131A CN104704131A CN201280076126.6A CN201280076126A CN104704131A CN 104704131 A CN104704131 A CN 104704131A CN 201280076126 A CN201280076126 A CN 201280076126A CN 104704131 A CN104704131 A CN 104704131A
- Authority
- CN
- China
- Prior art keywords
- reducing gas
- reduction
- fluidized
- nozzle
- blowing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
- C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
- C21B13/002—Reduction of iron ores by passing through a heated column of carbon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
- C21B13/143—Injection of partially reduced ore into a molten bath
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
- F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
- F27B15/10—Arrangements of air or gas supply devices
-
- 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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
Abstract
One embodiment of the present invention provides a reducing gas blowing apparatus for a fluidized reduction furnace, for providing a reducing gas to a fluidized bed formed on the top of a distribution plate having a passage formed therein, the reducing gas blowing apparatus for a fluidized reduction furnace comprising: a flange which is attached to the top surface of the distribution plate and has a hole formed therein to communicate with the passage; and a nozzle which has one end thereof coupled to the flange and the other end thereof tightly formed in the passage so as to induce a reducing gas to the fluidized bed, and which is made of a graphite material.
Description
Technical field
The present invention relates to a kind of device supplying reducing gas in Reduction on Fluidized Bed stove, relate more specifically to the reducing gas device for blowing of the Reduction on Fluidized Bed stove suppressing the muriatic attachment of molten alkali metal in the Reduction on Fluidized Bed stove of molten iron manufacturing apparatus.
Background technology
FINEX molten iron manufacturing apparatus is primarily of having coal packing layer for the Reduction on Fluidized Bed stove of reducing iron ore and inside and the melting furnace of reducing iron ore that melting is supplied to is formed.In melting furnace due to coal burning produce have stronger reducing power with carbon monoxide CO and hydrogen H
2for the gas of main component, so this gas is supplied to Reduction on Fluidized Bed stove as reducing gas.
This FINEX technique is just used after only carrying out particle size separation process to the common coal of digging up mine at first and iron ore, compared with the blast furnace process as existing iron smelting method, has the advantage that fuel cost is low and low in the pollution of the environment.
Fig. 1 is the schematic diagram of conventional FINEX molten iron manufacturing apparatus, and the top due to melting furnace 10 is the high-temperature service district of more than about 1000 DEG C, so the coal loaded produces a large amount of dust by thermolysis etc.More than 90% of the reducing gas of melting furnace 10 is captured in hot cyclone separator 45, is again put in melting furnace 10 afterwards, but the dust do not become trapped in flows in Reduction on Fluidized Bed stove 21,22,23.Flow into containing dust in the reducing gas of described Reduction on Fluidized Bed stove 21,22,23, dust comprises the reduced iron of coal thermolysis residue and molecule and alkali metal chloride etc.
High temperature reductive gas flows to fluidized-bed 27 (with reference to Fig. 2) through the breaker plate 26 be arranged on Reduction on Fluidized Bed stove 21,22,23.On described breaker plate 26 with a determining deviation be provided with hundreds of can the nozzle 51 that passes through of supplied gas, reducing gas is distributed in fluidized-bed 27 equably.But in the process of the reducing gas containing dust by nozzle 51, the liquid state existed in reducing gas or the alkali metal chloride etc. of gaseous state can corrode nozzle surface makes it become coarse, thus makes foreign matter easily be attached on nozzle surface.
In addition, at high temperature exist with liquid state due to alkali metal chloride and have viscosity, therefore foreign matter is easily attached to nozzle surface.The foreign matter being attached to described nozzle 51 surface can become large gradually along with the carrying out of operation, and the worst situation can cause spray nozzle clogging.If nozzle 51 generating portion blocks, then the flowing of reducing gas concentrates on subregion, and the phenomenon of reduced ore accumulation can occur in the region not having reducing gas to supply, and finally forms stagnant layer.Now, judge whether the passage 29 of breaker plate 26 blocks (with reference to Fig. 2), and described differential pressure gauge 28 is for detecting the pressure difference of the upper and lower sides of Reduction on Fluidized Bed stove 21,22,23 by installing differential pressure gauge 28.
If Reduction on Fluidized Bed stove 21,22,23 can not carry out fluidization treatment limit reducing iron ore to iron ore in limit, then need the operation stopping Reduction on Fluidized Bed stove 21,22,23, and change the nozzle being attached with foreign matter, there is inconvenience.In addition, in order to prevent alkali metal chloride to be attached in liquid form on nozzle, when the temperature of Reduction on Fluidized Bed stove 21,22,23 is maintained the fusing point lower than alkali metal chloride, then there is the problem that ore reduction rate declines.
Summary of the invention
The present invention, by suppressing to cause having height and can the molten alkali metal muriate of viscosity being attached on nozzle surface of the spray nozzle clogging of the breaker plate of Reduction on Fluidized Bed stove, makes the operation of Reduction on Fluidized Bed stove stably carry out.
In addition, the present invention also provides a kind of reducing gas device for blowing of Reduction on Fluidized Bed stove, and it improves the reduction ratio of ore by raising the temperature putting into the reducing gas of Reduction on Fluidized Bed stove, thus reduces fuel cost.
The reducing gas device for blowing of the Reduction on Fluidized Bed stove that one embodiment of the invention relates to is for supplying reducing gas to fluidized-bed, described fluidized-bed is formed at the top of the breaker plate with passage, described reducing gas device for blowing comprises: flange, its be installed on described breaker plate above and there is the hole with described channel connection; And nozzle, it is made up of graphite (graphite) material, and its one end is connected with described flange, and the other end is closely arranged on described passage, thus guides reducing gas to enter described fluidized-bed.
In addition, described flange can be combined by screw with described nozzle, and described nozzle can for the cone shape diminished gradually at the inflow direction radius of reducing gas.
The cone angle of described nozzle can be less than or equal to 90 degree.The inside of described nozzle can be inserted with iron core.
The lower end of described flange is formed with protection bank highlightedly, thus described flange is closely arranged on described passage.
In addition, the reducing gas device for blowing of the Reduction on Fluidized Bed stove that another embodiment of the present invention relates to is for supplying reducing gas to fluidized-bed, described fluidized-bed is formed at the top of the breaker plate with passage, described reducing gas device for blowing comprises: flange, its be installed on described breaker plate above and there is the hole with described channel connection; External nozzles, itself and described flange are integrally formed, and have cone shape, thus make it closely be combined with described passage; And inwardly projecting orifice, it is made up of graphite (graphite) material, and is installed on the inner peripheral surface of described external nozzles, thus guides reducing gas to enter described fluidized-bed.
According to the present invention, by the nozzle surface suppressing the molten alkali metal muriate contained in reducing gas to be attached to the breaker plate of reduction furnace, make the operation of Reduction on Fluidized Bed stove stable and carry out enduringly.
In addition, improved the reduction ratio of ore by the temperature raising reducing gas, thus can fuel cost be reduced.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the molten iron manufacturing apparatus with conventional Reduction on Fluidized Bed stove.
Fig. 2 is the enlarged view of the Reduction on Fluidized Bed stove that the embodiment of the present invention relates to.
Fig. 3 and Fig. 4 is the enlarged view of the nozzle that first embodiment of the invention relates to.
Fig. 5 is the enlarged view of the nozzle that second embodiment of the invention relates to.
Fig. 6 is the vertical view of the flange that the embodiment of the present invention relates to.
Fig. 7 is the sectional view that the display flange that relates to of first embodiment of the invention and nozzle are arranged on the state on breaker plate.
Embodiment
Referring to accompanying drawing, embodiments of the invention are described in detail, easily implement the present invention to enable those skilled in the art.The present invention can realize by various different shape, and protection scope of the present invention is not limited to embodiment described herein.In order to clearly the present invention is described, eliminate from accompanying drawing and irrelevant part is described, in specification sheets in the whole text, similar Reference numeral being employed for similar portion.
First, Fig. 1 is the schematic diagram of the molten iron manufacturing apparatus with conventional Reduction on Fluidized Bed stove, and Fig. 2 is any one enlarged view in the Reduction on Fluidized Bed stove 21,22,23 that relates to of the embodiment of the present invention.Fig. 3 to Fig. 5 is the enlarged view of the nozzle that the embodiment of the present invention relates to.
Melting furnace 10 and multi-stage fluidized reduction furnace 21,22,23 is comprised with reference to Fig. 1, FINEX molten iron manufacturing apparatus.Reduction on Fluidized Bed stove 21,22,23 can be made up of preheating oven 21, pre-reducing furnace 22 and final reduction furnace 23 3 grades.Final reduction furnace 23 is connected with melting furnace 10, and melting furnace 10 inside is formed with coal packing layer.
Iron ore powder along first to fourth ore conduit 31,32,33,34 from preheating oven 21, pre-reducing furnace 22, final reduction furnace 23 and melting furnace 10 move successively.And the reducing gas of melting furnace 10 is after hot cyclone separator 45, outside discharged to producing apparatus by final reduction furnace 23, pre-reducing furnace 22 and preheating oven 21 successively along first to fourth gas duct 41,42,43,44.
Now, described iron ore powder enters preheating oven 21 by the first ore conduit 31, and the reducing gas by being supplied by the 3rd gas duct 43, and the top of the breaker plate 50 in preheating oven 21 forms fluidized-bed 27 and carries out preheating.Then, iron ore powder enters pre-reducing furnace 22 by the second ore conduit 32, and the reducing gas by being supplied by the second gas duct 42, and the top of the breaker plate 50 in pre-reducing furnace 22 inside forms fluidized-bed 27 and carries out prereduction.
The iron ore powder of described prereduction enters final reduction furnace 23 by the 3rd ore conduit 33, and the reducing gas by being supplied by the first gas duct 41, and the top of the breaker plate 50 in final reduction furnace 23 inside forms fluidized-bed 27 and finally reduces.The reduced ore of described final reduction enters melting furnace 10 by the 4th ore conduit 34, and carries out melting at coal packing layer and convert molten iron to.Now, the reducing gas of preheating oven 21 inside passes through the 4th gas duct 44 discharged to device external.
With reference to Fig. 2, iron ore powder fluidized-bed 27 is positioned at by above the described breaker plate 26 that refractory brick is formed.Described breaker plate 26 is formed with hundreds of for being blown into the nozzle 51 of reducing gas with a determining deviation, thus the reducing gas flowed into by gas duct 41,42,43 is distributed in fluidized-bed 27 equably.Described breaker plate 26 is formed with the multiple passages 29 flowed into for reducing gas, and flange 50 is closely fixed on above described breaker plate 26, described flange 50 has the hole 56 be communicated with each described passage 29.
Below the reducing gas device for blowing that the first embodiment of the present invention relates to is described.
The one end of the described nozzle 51 that the first embodiment of the present invention relates to is combined with described flange 50, the other end is closely combined with described passage 29, thus guide reducing gas to enter described fluidized-bed 27, and described nozzle 51 is made up of graphite (graphite) material.Now, form the circular passage 29 be communicated with each described nozzle 51, nozzle 51 is opened.
Namely, the reducing gas device for blowing of the Reduction on Fluidized Bed stove that the first embodiment of the present invention relates to comprises flange 50 and nozzle 51, described flange 50 is tabular and is arranged on above described breaker plate 26, and described flange 50 is formed with the hole 56 be communicated with described passage 29; Described nozzle 51 is connected with described hole 56, from described flange 50 to the lower side of reduction furnace body 25 to outstanding.Described flange 50 and nozzle 51 are combined by combining unit 54, and described combining unit 54 can be such as that screw combines.
Described nozzle 51 has and more becomes large shape away from described its internal diameter of flange 50 and external diameter.That is, described nozzle 51 has from the downside end contacted at first with reducing gas near the cone shape that described its internal diameter of flange 50 and external diameter more diminish.The cone angle α of described nozzle 51 is only less than 180 degree, but along with described cone angle becomes large, the friction resistance of reducing gas also becomes large thereupon.Therefore, the cone angle that embodiments of the invention relate to is set to be less than or equal to 90 degree to increase wear resistance.Described angle is one embodiment of the invention, and the present invention is not limited to this.In addition, the thickness t of nozzle 51 that first embodiment of the invention relates to is about 10 millimeters (with reference to Fig. 3).
The reducing gas flowing into described reduction furnace body 25 contains the dust such as reduced iron and alkali metal chloride of coal thermolysis residue and molecule.When being included in the nozzle 51 of the dust in reducing gas by breaker plate 26, being attached to nozzle 51 inwall becomes foreign matter.Especially resemble Repone K (KCl) or the such alkali metal chloride of sodium-chlor (NaCl) is in a liquid state under the high temperature conditions and has viscosity, can be used as foreign matter and be attached to nozzle 51 surface.Occur for preventing this phenomenon, embodiments of the invention use and make nozzle 51 with the reactivity of alkali metal chloride and wetting properties (Wettabi l ity) low graphite (graphite) material, thus suppression muriate is attached on nozzle 51.
As shown in Figure 3, the nozzle 51 be made up of graphite and the combining unit 54 of flange 50 be made up of SUS310 are made volution, makes nozzle 51 and flange 50 be more prone to combine.Now, at high temperature its bonding force is increased by carburizing flange 50 and nozzle 51.
In addition, the lower end of flange 50 is formed with protection bank 58, and it is inserted in the passage 29 of described breaker plate 26, and nozzle 51 is combined securely with breaker plate 26, can prevent from accumulating dust etc. in the space between nozzle 51 and breaker plate 26 by described protection bank 58.Described protection bank 58 also have prevent mount and dismount time due to twist cause nozzle 51 to damage function.
Fig. 4 shows the state being provided with iron core in nozzle that embodiments of the invention relate to, by plugging iron core 57 in nozzle 51, can strengthen the resistibility of impacting the mechanicalness of graphite part.In order to change the reducing gas device for blowing that the embodiment of the present invention relates to, when removing the original nozzle 51 used, may occur nozzle 51 breakage to cause as breaker plate 26 between the passage 29 in space block, the situation causing the nozzle 51 be made up of graphite to break occurs, and the iron core 57 now plugged by inside prevents the sliver of the nozzle broken from coming off.
In addition, Fig. 6 is the vertical view of the flange that the embodiment of the present invention relates to, and Fig. 7 shows the state that nozzle that first embodiment of the invention relates to combines with the passage of breaker plate.
In addition, the reducing gas device for blowing of the Reduction on Fluidized Bed stove that the second embodiment of the present invention relates to can comprise: flange 50, and it is tabular and is installed on above described breaker plate 26, and is formed with the hole 56 be communicated with described passage 29; External nozzles 51b, itself and described flange 50 are integrally formed, and have and more become large cone shape away from its internal diameter of described hole 56, are closely combined on described passage 29 to make described external nozzles 51b; And inwardly projecting orifice 51a, it is made up of graphite material, and it is installed on the inner peripheral surface of described external nozzles 51b, thus guides reducing gas to enter described fluidized-bed 27.
As shown in Figure 5; the inwardly projecting orifice 51a that embodiments of the invention relate to is made up of graphite; for replacing and when dismantling nozzle 51; external nozzles 51b can protect the inwardly projecting orifice 51a be made up of graphite to avoid being subject to putting on the physical impact of external nozzles 51b; on the contrary, inwardly projecting orifice 51a can protect external nozzles 51b not by chemical corrosion.
The second embodiment of the present invention is the same with described first embodiment, is set to be less than or equal to 90 degree by the cone angle α of nozzle 51, and the inside of inwardly projecting orifice 51a can plug iron core 57.
In addition, the side, edge of the described flange 50 that the embodiment of the present invention relates to is formed with combined hole 53, thus by bolt etc., flange 50 is combined with breaker plate 26 or is separated.
Be illustrated embodiments of the invention above, but protection scope of the present invention is not limited to this, can carry out various distortion in the detailed content of claims, invention and the scope of accompanying drawing, this distortion ought to belong to protection scope of the present invention.
Claims (9)
1. the reducing gas device for blowing of a Reduction on Fluidized Bed stove, it is for supplying reducing gas to fluidized-bed, described fluidized-bed is formed at the top of the breaker plate with passage, it is characterized in that, described reducing gas device for blowing comprises: flange, its be installed on described breaker plate above and there is the hole with described channel connection; And nozzle, it is made up of graphite material, and its one end is connected with described flange, and the other end is closely arranged on described passage, thus guides reducing gas to enter described fluidized-bed.
2. the reducing gas device for blowing of Reduction on Fluidized Bed stove as claimed in claim 1, is characterized in that: described flange is combined by screw with described nozzle.
3. the reducing gas device for blowing of Reduction on Fluidized Bed stove as claimed in claim 1, is characterized in that: described nozzle is the cone shape diminished gradually at the inflow direction radius of reducing gas.
4. the reducing gas device for blowing of Reduction on Fluidized Bed stove as claimed in claim 3, is characterized in that: the cone angle of described nozzle is for being less than or equal to 90 degree.
5. the reducing gas device for blowing of Reduction on Fluidized Bed stove as claimed in claim 1, is characterized in that: the inside of described nozzle is inserted with iron core.
6. the reducing gas device for blowing of Reduction on Fluidized Bed stove as claimed in claim 1, is characterized in that: the lower end of described flange is formed with protection bank highlightedly, thus described flange is closely arranged on described passage.
7. the reducing gas device for blowing of a Reduction on Fluidized Bed stove, it is for supplying reducing gas to fluidized-bed, described fluidized-bed is formed at the top of the breaker plate with passage, it is characterized in that, described reducing gas device for blowing comprises: flange, its be installed on described breaker plate above and there is the hole with described channel connection; External nozzles, itself and described flange are integrally formed, and have cone shape, thus make it closely be combined with described passage; And inwardly projecting orifice, it is made up of graphite material, and is installed on the inner peripheral surface of described external nozzles, thus guides reducing gas to enter described fluidized-bed.
8. the reducing gas device for blowing of Reduction on Fluidized Bed stove as claimed in claim 7, is characterized in that: the cone angle of described cone shape is less than or equal to 90 degree.
9. the reducing gas device for blowing of Reduction on Fluidized Bed stove as claimed in claim 7, is characterized in that: the inside of described inwardly projecting orifice is inserted with iron core.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/KR2012/008302 WO2014058088A1 (en) | 2012-10-12 | 2012-10-12 | Reducing gas blowing apparatus for fluidized reduction furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104704131A true CN104704131A (en) | 2015-06-10 |
Family
ID=50477544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201280076126.6A Pending CN104704131A (en) | 2012-10-12 | 2012-10-12 | Reducing gas blowing apparatus for fluidized reduction furnace |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN104704131A (en) |
| IN (1) | IN2015DN03333A (en) |
| WO (1) | WO2014058088A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112923733A (en) * | 2021-02-02 | 2021-06-08 | 北京绿清科技有限公司 | Method for producing silicon carbide by adopting multi-furnace series connection grading melting furnace and special production system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6213763A (en) * | 1985-07-09 | 1987-01-22 | Nissan Motor Co Ltd | Nozzle for fuel gas generator |
| CN86101920A (en) * | 1986-03-22 | 1987-09-30 | 布赖恩·哈丁 | Fluid bed |
| KR20030052394A (en) * | 2001-12-21 | 2003-06-27 | 주식회사 포스코 | A gas distributor nozzle of fluidized bed reactor |
| KR20100023382A (en) * | 2008-08-21 | 2010-03-04 | 한국에너지기술연구원 | Gas distributer of fluidized bed reactor |
| KR20110075908A (en) * | 2009-12-29 | 2011-07-06 | 주식회사 포스코 | Gas distribution unit and fluidizd-bed reduction reactor comprising the same |
| CN102713001A (en) * | 2009-11-18 | 2012-10-03 | 瑞科硅公司 | Fluid bed reactor |
-
2012
- 2012-10-12 WO PCT/KR2012/008302 patent/WO2014058088A1/en active Application Filing
- 2012-10-12 CN CN201280076126.6A patent/CN104704131A/en active Pending
- 2012-10-12 IN IN3333DEN2015 patent/IN2015DN03333A/en unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6213763A (en) * | 1985-07-09 | 1987-01-22 | Nissan Motor Co Ltd | Nozzle for fuel gas generator |
| CN86101920A (en) * | 1986-03-22 | 1987-09-30 | 布赖恩·哈丁 | Fluid bed |
| KR20030052394A (en) * | 2001-12-21 | 2003-06-27 | 주식회사 포스코 | A gas distributor nozzle of fluidized bed reactor |
| KR20100023382A (en) * | 2008-08-21 | 2010-03-04 | 한국에너지기술연구원 | Gas distributer of fluidized bed reactor |
| CN102713001A (en) * | 2009-11-18 | 2012-10-03 | 瑞科硅公司 | Fluid bed reactor |
| KR20110075908A (en) * | 2009-12-29 | 2011-07-06 | 주식회사 포스코 | Gas distribution unit and fluidizd-bed reduction reactor comprising the same |
Non-Patent Citations (1)
| Title |
|---|
| 欧阳德刚等: "无气化室喷枪长寿命综合技术的研究与应用", 《炼钢》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112923733A (en) * | 2021-02-02 | 2021-06-08 | 北京绿清科技有限公司 | Method for producing silicon carbide by adopting multi-furnace series connection grading melting furnace and special production system |
Also Published As
| Publication number | Publication date |
|---|---|
| IN2015DN03333A (en) | 2015-10-23 |
| WO2014058088A1 (en) | 2014-04-17 |
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