CN101365810B - A dust recycling system for enhanced availability of Corex - Google Patents
A dust recycling system for enhanced availability of Corex Download PDFInfo
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- CN101365810B CN101365810B CN2006800524015A CN200680052401A CN101365810B CN 101365810 B CN101365810 B CN 101365810B CN 2006800524015 A CN2006800524015 A CN 2006800524015A CN 200680052401 A CN200680052401 A CN 200680052401A CN 101365810 B CN101365810 B CN 101365810B
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
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- 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
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
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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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- Manufacturing & Machinery (AREA)
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- Environmental & Geological Engineering (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The present invention provides a dust recycling system for directly smelting reduction iron making process, which is used for increasing efficiency. The dust recycling system to capture dust from reduction gas and inject the same back into the melter gasifier for dust burning in a smelting reduction iron making process comprising a hot gas cyclone (HGC), a low dust bin (LDB) in operative connection to said hot gas cyclone for continuous flow of the captured dust through a hot knife gate and valve vertical pipelines provided at an inclination ranging from 4 to 12; said low dust bin (LDB) further operatively connected through a vertical pipeline and an inlet to a high dust volume T-piece (TP) comprising of injector and diffuser means; and a melter gasifier having dust burner to burn the dust thus recycled into the melter gasifier through said T-piece. The above system is adapted to favour effective and jam free transportation of dust from the hot gas cyclone to the dust burner and thereby improve plant availability/efficiency.
Description
Technical field
The invention belongs to the Metal smelting field, be specifically related to a kind of fume recovery system that is used to promote direct melting reduction iron production (Corex) technology of benefit.
Background technology
At present known in order to follow direct melting reduction iron production (Corex), finish the fused reduction iron-smelting process.Specific, this fused reduction iron-smelting process comprises two reaction units basically: i) shaft furnace (reduction shaft) and ii) melting gasification furnace (melter gasifier).High reducing gas is filled and coal produces reaction and produced by bearing between oxygen and iron in this melting gasification furnace.In this furnace chamber, the particulate that this gas comprises filling is admitted to this shaft furnace, and with after repeating to make it through dust separation cyclone, reducing this iron mixture is iron.Promptly sent back to melting gasification furnace after this dust separation via fume recovery system.
Therefore, fume recovery system provides to realize catching autoreduction gas and next dust, again it is penetrated melt back and melts vapourizing furnace.Carbon in the dust will fall through the oxygen that dust burner provided is burned.
Recovery system commonly used at present is about using a high hot gas cyclone, high dust box (upper dustbin), low dust box (lower dustbin), dust to penetrate system, T type spare (T-piece) and dust burner, all functionally interconnecting through vertical duct and dish gate and valve (disk gate valve).
Use comprises a device basically in this high hot gas cyclone of these recovery systems, and it is in order to catching the dust that autoreduction gas comes, and these isolating dust are delivered to high dust box.This high dust box is intermediary's case, catches this dust in order to this high hot gas cyclone certainly, and is sent to this low dust box.This type of high dust box generally comprises compression system and levelling device (levelers), to detect high and low restriction.Fluidization dust when nitrogen (N2) is used to hang down.Should low dust box be in order to this high dust box certainly, transmit this dust through a T type spare and inject system to this.This dust is injected system and is comprised two valves basically, and I) ball valve is imported with control, and other valve II) to control the flow rate of nitrogen.
Also have a vertical conduit, have the import of about 300/200 millimeter (mm) caliber, be in order to connect should low dust box to this T type spare.This conduit to the outlet end of this T type spare is about 200/100 millimeter caliber.This T type spare comprises injection device and scatterer, and is about 400/300 millimeter caliber.This dust burner is in order to utilize the oxygen in this melting gasification furnace, the dust that burning is taken by nitrogen.
Importantly, following operation, meaning is that traditional fume recovery system is that the dust that this high hot gas cyclone is certainly come is sent to this dust injection device, is to utilize the valve of this system of adjustment to finish.Because of aforementioned purpose, this system has high dish gate and valve, main frame gate and valve, high pressure valve and low pressure valve.High Pan Zha carries dust outside to should be low opening during dust box in order to this high dust box certainly, and the main frame lock keeps cutting out.These Pan Zha are selectivity operations, finish aforementioned dust reclaimer according to the rank (level) of each dust box.
The aforementioned system that is used for the dust recovery that both deposited is known and widely utilizes in the fused reduction iron-smelting process.Have some restriction and shortcoming yet this type systematic is found, can't reclaim the dust any obstruction of generation in the conduit of operation again by successive.Specific, need to detect frequency in this type of system nature, be collected into low dust box about dust in regular turn from high dust box, and finally all delivered to this dust burner via this T type spare.Therefore as long as in the stove instability is arranged slightly, just can't bear desired dust load.Therefore often cause of the obstruction of fume recovery system conduit, and finally cause shut down/can't using in some position.
Specific, pointed out in reclaiming conduit, to have the number place about the research of this quasi-tradition fume recovery system and the point that stops up often occurred, comprise in the filling box of a) this height and main frame gate and valve, b) import and the c of T type spare) this high dust box and should low dust box in.
What is more, this vertical conduit is connected to this T type spare place to have an outlet end and is about 200/100 millimeter caliber, its opening in low dust box place is about 300-200 millimeter caliber simultaneously, causes accumulating dust and coarse particle in the import of this T type spare, also causes frequent obstruction.These horizontal ranks to this dust burner also often is found obstruction, particularly when dust comprises than coarse particle.
Simultaneously should the person of noting, the cooling system that existing fume recovery system also faces the dish gate and valve the problem in the stove of entering of leaking.Even having research to point out, in this type systematic, the refractory material (refractory) in high dust box and the low dust box becomes flexible because of thermal shocking, therefore also causes these fume recovery system ranks to produce in the number place and stops up.
Summary of the invention
Purpose of the present invention promptly is, by catching dust in the reducing gas and its retroeflection being gone into this melting gasification furnace with at fused reduction iron-smelting process internal combustion dust, can avoid the problem and the shortcoming of aforementioned existing fume recovery system, and transmit dust to the transport process of dust burner by high hot gas cyclone, efficient is high can not stopped up simultaneously, has therefore improved the available rate and the efficient of facility.
Another object of the present invention is to, reclaim in the fume recovery system at dust, in order to reclaim the dust that this autoreduction gas is caught, and it is injected in the melting gasification furnace, simple and easy the use do not need the dust of complexity, the accurate monitoring of artificial batch change to be sent to the dust burner of prior art.
Another purpose of the present invention is, in fume recovery system in order to reclaim the dust that this autoreduction gas is caught, and it is injected in the melting gasification furnace, it is stable and is suitable for transmitting dust continuously and can avoids batch a complexity and a problem of changing the transmission dust, and can avoid because of problems such as complexity unstable in the stove or batch change transmission that similar factor causes.
Another purpose of the present invention; in fume recovery system, catch dust in order to autoreduction gas, and it is injected in the melting gasification furnace; can avoid in the fume recovery system conduit often taking place blocking problem, and can avoid facility to shut down and be suitable for strengthening facility operability and efficient.
Another purpose of the present invention is, in fume recovery system, catch dust in order to autoreduction gas, and it is injected in the melting gasification furnace, frequent blocking problem does not take place in it, particularly be positioned at the filling box, the import of T type spare of high and low gate and valve and in high dust box and low dust box, the position promptly often goes wrong when using in existing fume recovery system.
Another purpose of the present invention is, in fume recovery system, catches dust in order to autoreduction gas, and it is injected in the melting gasification furnace, with the dust that burns in the fused reduction iron-smelting process, can avoid at the import accumulation dust of this T type spare and than coarse particle.Therefore, also can avoid in the import of this T type spare accumulation and stop up.
Another purpose of the present invention is, in fume recovery system, catches dust in order to autoreduction gas, and it is injected in the melting gasification furnace, produces when wherein the horizontal ranks of this dust burner can be avoided comprising in dust than coarse particle and stops up.
Another purpose of the present invention is, in fume recovery system, catch dust in order to autoreduction gas, and in dust combustion, inject it in melting gasification furnace, the cooling system that can avoid the coiling gate and valve problem to stove of leaking, the problem that this is faced for existing fume recovery system.
Another purpose of the present invention is, in fume recovery system, catch dust in order to autoreduction gas, and it is injected in the melting gasification furnace, with the dust that in the fused reduction iron-smelting process, burns, can not cause that refractory material (refractory) become flexible because of thermal shocking in high dust box and the low dust box, cause this fume recovery system to produce and stop up, have a problem that fume recovery system is faced as present.
Another purpose of the present invention is; in fume recovery system; catch dust in order to autoreduction gas; and it is injected in the melting gasification furnace; with the dust that burns in the fused reduction iron-smelting process, it can avoid causing the regular shutdown of facility because of the fume recovery system ranks hinder, and also can not produce back pressure to cyclonic arrangement; as the problem that at present existing fume recovery system is faced in the fused reduction iron-smelting process, improve facility operability and efficient with this.
Can reach the fume recovery system of direct melting reduction iron production (Corex) technology that is used to promote benefit of foregoing invention purpose, it provides fume recovery system to catch dust in order to autoreduction gas, and it is injected in the melting gasification furnace, with the dust that burns in the fused reduction iron-smelting process, it comprises:
High hot gas cyclone, but this dust caught in the suitable autoreduction gas;
Dust box is connected to this high hot gas cyclone, continuously this has been caught dust flow through bonnet hot knife gate valve and vertical conduit, wherein vertical conduit have range of tilt angles from 4 degree to 12 degree, the preferably is 8 degree;
This dust box more connects paramount dust capacity T type spare by vertical conduit and import, comprises injection device and scatterer; And
Melting gasification furnace has dust burner is recycled to this melting gasification furnace via this T type spare with burning dust.
Aforementioned fume recovery system is suitable can to transmit dust to this dust burner from high hot gas cyclone, and does not stop up this transmission ranks.Prior, in fume recovery system of the present invention, the Gao Panzha that existing recovery system comprises has been replaced by bonnet hot knife gate valve (bonnet hot knife gate valve), and its preferably makes with stainless steel.This bonnet hot knife gate valve does not need water cooling system, only needs the nitrogen cooling system simply.Significantly, for the fume recovery system notion of the invention described above, it need not can finish this dust removal process by high dust box fully.According to the purpose of system of the present invention, this high hot gas cyclone is to be connected directly to low dust box, and by this bonnet hot knife gate valve and vertical conduit, it has an inclination between the 4-12 degree, and the preferably is 8 degree.This kind arrangement also has can avoid refractory material problem and high dust box in the import blocking problem of this T type spare, as the present fume recovery system person of facing.
According to another object of the present invention, it provides fume recovery system to catch dust in order to autoreduction gas, and it is injected in the melting gasification furnace, and with the dust that burns in a fused reduction iron-smelting process, it comprises:
High hot gas cyclone, but this dust caught in the suitable autoreduction gas;
Dust box is connected to this high hot gas cyclone, continuously this has been caught dust flow through bonnet hot knife gate valve and vertical conduit, wherein vertical conduit have range of tilt angles from 4 degree to 12 degree, the preferably is 8 degree;
This dust box more connects paramount dust capacity T type spare by vertical conduit and import, comprises injection device and scatterer;
Melting gasification furnace has dust burner is recycled to this melting gasification furnace via this T type spare with burning dust; And
Collect kettle, suitable can collect this dust or than coarse particle with online removing and eliminate ranks and stop up.
According to the purpose of aforementioned fume recovery system of the present invention, its be suitable in any may state, collect dust or than coarse particle, a collection kettle that is positioned at this fume recovery system ranks below is provided to this system of the present invention.This kind collection kettle is that supply is to be embodied directly in the obstruction that line is removed the fume recovery system ranks and eliminated the fume recovery system ranks fully.
According to another object of the present invention, it provides fume recovery system to catch dust in order to autoreduction gas, and it is injected in the melting gasification furnace, and with the dust that burns in a fused reduction iron-smelting process, it comprises:
High hot gas cyclone, but this dust caught in the suitable autoreduction gas;
Dust box is connected to this high hot gas cyclone, continuously this has been caught dust flow through bonnet hot knife gate valve and vertical conduit, have a range of tilt angles from 4 degree to 12 degree, the preferably is 8 degree;
This dust box more connects paramount dust capacity T type spare via vertical conduit and import, comprises injection device and scatterer;
Melting gasification furnace has dust burner is recycled to this melting gasification furnace via this T type spare with burning dust;
Collect kettle, suitable can collect this dust or than coarse particle with online removing and eliminate ranks and stop up; And
The gangway is with easy maintenance and cleaning.
Aforementioned gangway is directly to be suitable for easy maintenance and this system of cleaning.
Importantly, in the aforementioned fume recovery system, this bonnet hot knife gate valve is to make with stainless steel.Simultaneously, this bonnet hot knife gate valve comprises the nitrogen cooling system.In aforementioned system of the present invention, this vertical conduit is to be connected to this T type spare, has coaxial 300/200 millimeter import via one of this vertical tube.This T type spare is to hold high dust capacity, and it comprises 500/400 millimeter T type spare.
According to another preferable purpose of fume recovery system of the present invention, it comprises net grid between this injection device and this scatterer, but thus filtering agglomerate object to avoid stopping up the horizontal ranks of dust burner.
Apparently; fume recovery system of the present invention be can get simply and because continuously clog-freely certainly should high hot gas cyclone transmission dust to dust burner; operability and efficient that it can be avoided facility stop time and improvement is provided, and have simple and effective cleaning and maintenance characteristics.What is more, this system also is suitable for handling high dust load extremely per hour eight tons (8t/hour).
Description of drawings
Fig. 1 is used for the view of fused reduction iron-smelting process in the existing fume recovery system ranks;
Fig. 2 is the view that is used for the fused reduction iron-smelting process of the fume recovery system of direct melting reduction iron production (Corex) technology that is used to promote benefit provided by the present invention.
Description of reference numerals
1 high hot gas cyclone
Shut-off valve on 2
3 high dust box
4 low dust box
5 times shut-off valves
6T type spare
7 high dish gate and valves
8 main frame gate and valves
9 Chinese shape for hat spares
10 net grid
11 temperature control loops
12 injection devices
13 solenoid operated valve
14 melting gasification furnaces
15 cover flange piece
16 bonnet hot knife gate valve
17 horizontal ranks
18 loop expansion pipes
19 collect kettle
Embodiment
Please consult Fig. 1 earlier, its existing fume recovery system ranks are gone into melting gasification furnace in order to autoreduction gas seizure dust and retroeflection.
As shown in Figure 1, these fume recovery system ranks of both having deposited comprise high hot gas cyclone 1 (HGC) basically, upward shut-off valve 2 (USV), high dust box 3 (UDB), low dust box 4 (LDB), following shut-off valve 5 (LSV), dust are injected system, T type spare 6 (TP) and dust burner.The operability member of above-mentioned all fume recovery systems is for operatively being connected with main frame gate and valve 8 (LDG) via vertical conduit and high dish gate and valve 7 (UDG), shown in figure.
By Fig. 1 obviously as can be known, the fume recovery system ranks that this had both deposited, in high hot gas cyclone 1 (HGC), it one of comprises as shown in the figure Chinese shape for hat spare 9 (Chinese Hat) to create summit plastotype (vertexformation) with separating coarse-grained son and fine solid particle in this high hot gas cyclone 1, should be captured by the dust of reducing gas gained, and this isolating dust is sent to high dust box 3 (UDB) via shut-off valve 2 on net grid 10 and one and high dish gate and valve 7.Specific, this high dust box 3 is intermediary's case (intermediate bin), and meaning promptly provides with this high hot gas cyclone 1 certainly and transmits this dust that is captured to hanging down dust box 4 (LDB) via this main frame gate and valve 8.This high dust box 3 (UDB) comprises compression system and levelling device (leveler), to detect high and low restriction.This nitrogen is provided to lower part with this dust of fluidization.
Existed system should also have net grid 10 by low dust box 4 (LDB), and be in order to this high dust box 3 (UDB) certainly, through once shut-off valve 5, a temperature control loop 11 and T type spare 6 (TP), the transmission dust is to injecting system.This dust is injected system and is comprised two valves basically, one of them be ball valve to control this input, another is used to control the flow velocity of nitrogen.
Vertical conduit has 300/200 millimeter import, connects low dust box 4 (LDB) to T type spare 6.The outlet end of this conduit is 200/100 millimeter.This T type spare 6 has this injection device 12 and scatterer, as shown in the figure.This T type spare 6 generally has 400/300 millimeter diameter.
This dust is after catching, and by this dust burner burning, promptly (solenoidoperated valve SOV) is provided in the melting gasification furnace 14, with the common dust that burns and carried by nitrogen of oxygen via a solenoid operated valve 13 for it.
The aforementioned fume recovery system ranks of both having deposited, the valve by Adjustment System is finished in following operation significantly, promptly transmits this dust to the dust injection device from this high hot gas cyclone 1 (HGC).For reaching this purpose, this system has high dish gate and valve 7 (UDG), main frame gate and valve 8 (LDG), high pressurization valve and low pressurization valve.This height dish gate and valve 7 (UDG) is to open, and this main frame gate and valve 8 (LDG) is to keep closing with this high dust box 3 (UDB) certainly carrying dust outside to hanging down dust box 4 (LDB).These Pan Zha are that the rank (level) according to arbitrary dust box is operated.This vertical conduit ends at one and covers flange piece 15, and it is positioned at the bottom, via a bonnet hot knife gate valve 16.Therefore in the fume recovery system of both having deposited, it is through T type spare 6 from the dust that high dust box 3 (UDB) is collected in low dust box 4 (LDB), according to preset frequency, batch delivers to dust burner.Therefore, have smallly when unstable in stove, the previous batch program can't be handled dust load.And some point that causes the fume recovery system ranks often produces obstruction, and finally causes facility to be shut down.Specific, often produce the point that stops up in these ranks, be to be identified as to comprise a) the filling box of this height and main frame gate and valve 7,8; B) import of this T type spare 6; And c) this high dust box 3 (UDB) and low dust box 4 (LDB).
What is more, in existing system, this vertical conduit that is connected to T type spare 6 comprises the outlet end of 200/100 millimeter caliber of tool, and its opening at low dust box 4 (LDB) is 300/200 millimeter simultaneously.This causes dust and accumulates on the import of this T type spare 6 and cause frequent obstruction than coarse particle.
And, in existed system, should also stop up easily to the horizontal ranks 17 of dust burner, when having in the dust than coarse particle.The cooling system of dish gate and valve also can leak to stove.Even in existed system, the refractory materials of high dust box 3 (UDB) and low dust box 4 (LDB) also is found and can gets loose because of thermal shocking, and then causes more multiple-point obstruction in the fume recovery system ranks.
See also Fig. 2 now, it illustrates according to fume recovery system ranks of the present invention, is used for the fused reduction iron-smelting process.It is suitable for lowering the obstruction of fume recovery system ranks and improves the facility operability.In Fig. 2, have with Fig. 1 (existing system) same components number and name and be referred to as this formation thing/member, represent that it has same characteristic features, and also find expression in the present invention's fume recovery system, and, also should be read as the principle of work that is equal to identical components in the earlier figures 1 and understand with running about the narration of Fig. 2.
As shown in Figure 2, these fume recovery system ranks of the present invention are suitable to transmit dust to dust burner from this high hot gas cyclone 1 (HGC) serially, and can not produce obstruction in ranks.This can be reached by installing fume recovery system as shown in Figure 2.
Specific, as shown in Figure 2, this fume recovery system of the present invention is removed as height dish gate and valve 7 (UDG) shown in Figure 1, and replaces with a loop expansion pipe 18 and a bonnet hot knife gate valve 16 (KGV), and its preferably makes with stainless steel.This bonnet hot knife gate valve 16 (KGV) of system of the present invention does not need water-cooling system, and only needs simple nitrogen cooling system.Even fume recovery system of the present invention as shown in Figure 2 by removing high dust box 3 (UDB) demand as Fig. 1, has the benefit of continuity operation.Therefore, in the present invention, this high hot gas cyclone 1 (HGC) is to be connected to this low dust box 4 (LDB), it comprises this loop expansion pipe 18, and it is as same snubber, and enlarges load because of the high heat of dust ranks, when the hot coarse particle dust particle of this height via high hot gas cyclone 1 during to low dust box 4, bonnet hot knife gate valve 16 and vertical conduit ranks have an angle of inclination and are positioned at 4-12 degree scope, and the preferably is 8 degree.This system is suitable for eliminating that refractory materials because of high dust box causes in the obstruction of the import of T type spare 6.
Simultaneously, be used for as shown in Figure 1 that this main frame gate and valve 8 of existed system does not also need to be placed in the set continuous dust transfer system according to the present invention, as shown in Figure 2.Therefore, do not need main frame gate and valve 8 among the present invention fully.
This vertical conduit is attached to the T type spare 6 with import, and it for having 200/100 millimeter caliber, also is modified to having 300/200 millimeter in the existed system of Fig. 1, as this vertical conduit, to be suitable for efficient transmission dust.Simultaneously, this T type spare 6 has 400/300 millimeter caliber in prior art, also is modified in native system for having 500/400 millimeter caliber, to be suitable for realizing high dust load.One net grid 10 are used to this fume recovery system, between this injection device 12 and this scatterer, with filtering agglomerate object to avoid stopping up the horizontal ranks 17 of dust burner.This system comprises the gangway, to realize safeguarding easily and cleaning this fume recovery system.
Aforementioned gangway is directly to be suitable for easy maintenance and this system of cleaning.
Apparently; fume recovery system of the present invention be can get simply and because continuously clog-freely certainly should high hot gas cyclone 1 transmission dust to dust burner; operability and efficient that it can be avoided facility stop time and improvement is provided, and have simple and effective cleaning and maintenance characteristics.What is more, this system also is suitable for handling high dust load extremely per hour eight tons (8t/hour).
According to the purpose of fume recovery system of the present invention, it is to collect this dust than coarse particle in order to be suitable under any possibility situation, and therefore the collection kettle 19 that is positioned at this fume recovery system ranks below is provided.This collection kettle 19 is to have more a bonnet hot knife gate valve 16 these purposes that can realize these fume recovery system ranks of online cleaning and realize eliminating this fume recovery system obstruction.
Utilize system of the present invention to reduce dust and reclaim the advantage of ranks obstruction as shown in Figure 2, with the systematic comparison of both having deposited (as shown in Figure 1).Stop up number of times via fume recovery system ranks in further research and the Yu Yinian, by experiment for several times, the result who uses existing system simultaneously and use system of the present invention is described in following table one.
Table one
As shown in Table 1, use fume recovery system of the present invention, total obstruction number of times of its fume recovery system ranks through year experiment for several times, can reduce significantly.
Simultaneously, research is also pointed out to use and had both been deposited fume recovery system (Fig. 1) and to have used fume recovery system of the present invention (Fig. 2), in the year experiment, because the shutdown number of times in ranks unplanned due to stopping up, shown in following table two.
Table two
Result shown in the table two confirms to use fume recovery system ranks of the present invention more, can obtain the operability of one of percentage hundred, and avoids all shutdown in unplanned.The more important thing is that the online cleaning function of fume recovery system ranks of the present invention can be removed fully because the fume recovery system ranks stop up the halting problem that is caused.
Fume recovery system of the present invention has advantage, and is suitable for making facility to reach the operability of one of percentage hundred, and the obstruction of essence minimizing ranks, also can utilize collection kettle 19 of the present invention to reach online removing function.The more important thing is, the present invention can transmit dust to dust burner from high hot gas cyclone 1 continuously, ranks can not take place yet to be stopped up, with respect to both depositing fume recovery system, be more suitable for handling high dust load, to bring into play efficient and this fume recovery system of better application in the fused reduction iron-smelting process.
Claims (10)
1. fume recovery system that is used to promote the direct melting reduction iron production technology of benefit is characterized in that this system includes:
High hot gas cyclone is suitable for catching in the autoreduction gas this dust;
Dust box is connected to this high hot gas cyclone, will catch dust flow through bonnet hot knife gate valve and vertical conduit continuously, wherein vertical conduit have range of tilt angles from 4 degree to 12 degree;
This dust box more connects paramount dust capacity T type spare through vertical conduit and import, comprises injection device and scatterer; And
Melting gasification furnace has dust burner is recycled to this melting gasification furnace via this T type spare with burning dust.
2. fume recovery system that is used to promote the direct melting reduction iron production technology of benefit is characterized in that this system includes:
High hot gas cyclone is suitable for catching in the autoreduction gas this dust;
Dust box is connected to this high hot gas cyclone, will catch dust flow through bonnet hot knife gate valve and vertical conduit continuously, wherein vertical conduit have range of tilt angles from 4 degree to 12 degree;
This dust box more connects paramount dust capacity T type spare via vertical conduit and import, comprises injection device and scatterer;
Melting gasification furnace has dust burner is recycled to this melting gasification furnace via this T type spare with burning dust; And
Collect kettle, suitable can collect this dust or than coarse particle with online removing and eliminate ranks and stop up.
3. fume recovery system that is used to promote the direct melting reduction iron production technology of benefit is characterized in that this system includes:
High hot gas cyclone is suitable for catching in the autoreduction gas this dust;
Dust box is connected to this high hot gas cyclone, will catch dust flow through bonnet hot knife gate valve and vertical conduit continuously, wherein vertical conduit have range of tilt angles from 4 degree to 12 degree;
This dust box more connects paramount dust capacity T type spare via vertical conduit and import, comprises injection device and scatterer;
Melting gasification furnace has dust burner is recycled to this melting gasification furnace via this T type spare with burning dust;
Collect kettle, suitable can collect this dust or than coarse particle with online removing and eliminate ranks and stop up; And
The gangway is with easy maintenance and cleaning.
4. by the described fume recovery system that is used to promote the direct melting reduction iron production technology of benefit of 1,2 or 3 of claims the, it is characterized in that described bonnet hot knife gate valve is to make with stainless steel.
5. by the described fume recovery system that is used to promote the direct melting reduction iron production technology of benefit of 1,2 or 3 of claims the, it is characterized in that described bonnet hot knife gate valve comprises the nitrogen cooling system.
6. by the described fume recovery system that is used to promote the direct melting reduction iron production technology of benefit of 1,2 or 3 of claims the, it is characterized in that described vertical conduit is that the import through 300/200 millimeter caliber connects this T type spare.
7. by the described fume recovery system that is used to promote the direct melting reduction iron production technology of benefit of 1,2 or 3 of claims the, it is characterized in that described T type spare comprises the T type spare with 500/400 millimeter, to finish high dust capacity.
8. by the described fume recovery system that is used to promote the direct melting reduction iron production technology of benefit of 1,2 or 3 of claims the, it is characterized in that, described fume recovery system comprises the net grid, its between this injection device and this scatterer, with filtering agglomerate object to avoid stopping up the horizontal ranks of dust burner.
9. by the described fume recovery system that is used to promote the direct melting reduction iron production technology of benefit of 1,2 or 3 of claims the, it is characterized in that the suitable dust capacity of can handling of described fume recovery system is to per hour eight tons.
10. by the described fume recovery system that is used to promote the direct melting reduction iron production technology of benefit of 1,2 or 3 of claims the, it is characterized in that it is 8 degree that described vertical conduit has the angle of inclination.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN1095MU2006 | 2006-07-10 | ||
| IN1095/MUM/2006 | 2006-07-10 | ||
| PCT/IN2006/000443 WO2008007387A1 (en) | 2006-07-10 | 2006-11-08 | A dust recycling system for enhanced availability of corex |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101365810A CN101365810A (en) | 2009-02-11 |
| CN101365810B true CN101365810B (en) | 2011-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800524015A Active CN101365810B (en) | 2006-07-10 | 2006-11-08 | A dust recycling system for enhanced availability of Corex |
Country Status (5)
| Country | Link |
|---|---|
| KR (1) | KR101275107B1 (en) |
| CN (1) | CN101365810B (en) |
| AT (1) | AT505201B1 (en) |
| WO (1) | WO2008007387A1 (en) |
| ZA (1) | ZA200803129B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| MX2013007721A (en) * | 2010-12-30 | 2013-11-04 | Ivanhoe Energy Inc | Method, system, and apparatus for separation in processing of feedstocks. |
| CN103966380B (en) * | 2013-01-24 | 2016-06-29 | 宝山钢铁股份有限公司 | A kind of method recycling shaft furnace top coal gas dust removal powder |
| KR101722047B1 (en) * | 2015-12-23 | 2017-03-31 | 주식회사 포스코 | Cyclone |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0316819A1 (en) * | 1987-11-13 | 1989-05-24 | Kawasaki Jukogyo Kabushiki Kaisha | Metal-making process and apparatus involving the smelting reduction of metallic oxides |
| US5989309A (en) * | 1995-12-29 | 1999-11-23 | Pohang Iron & Steel Co., Ltd. | Method for injecting fine iron ore in smelting reducing process |
| US6585798B2 (en) * | 1999-12-20 | 2003-07-01 | Pohang Iron & Steel Co., Ltd. | Fluidized bed reactor for preventing the fine iron ore from sticking therein and method thereof |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4422390A (en) * | 1980-07-16 | 1983-12-27 | Fmc Corporation | Process and apparatus for collection of gases and particulates in a furnace feed system |
| US4733619A (en) * | 1986-12-01 | 1988-03-29 | Ube Industries | Powder feeder |
| KR100414533B1 (en) * | 1997-07-03 | 2004-02-14 | 에스케이 주식회사 | Dust conveyor system of electric dust collector |
| KR100431858B1 (en) * | 2000-10-23 | 2004-05-20 | 주식회사 포스코 | Disc for removing heat from dust recycling system of corex |
| KR100584732B1 (en) * | 2001-04-27 | 2006-05-30 | 주식회사 포스코 | Recycling method of waste material by using of coal based iron making process |
| KR101036636B1 (en) * | 2003-12-16 | 2011-05-24 | 주식회사 포스코 | Apparatus for recycling dust in COREX process |
-
2006
- 2006-11-08 WO PCT/IN2006/000443 patent/WO2008007387A1/en active Application Filing
- 2006-11-08 AT AT0953106A patent/AT505201B1/en not_active IP Right Cessation
- 2006-11-08 CN CN2006800524015A patent/CN101365810B/en active Active
-
2008
- 2008-04-09 ZA ZA200803129A patent/ZA200803129B/en unknown
- 2008-04-24 KR KR1020087009855A patent/KR101275107B1/en active IP Right Grant
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0316819A1 (en) * | 1987-11-13 | 1989-05-24 | Kawasaki Jukogyo Kabushiki Kaisha | Metal-making process and apparatus involving the smelting reduction of metallic oxides |
| US5989309A (en) * | 1995-12-29 | 1999-11-23 | Pohang Iron & Steel Co., Ltd. | Method for injecting fine iron ore in smelting reducing process |
| US6585798B2 (en) * | 1999-12-20 | 2003-07-01 | Pohang Iron & Steel Co., Ltd. | Fluidized bed reactor for preventing the fine iron ore from sticking therein and method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| AT505201A2 (en) | 2008-11-15 |
| KR101275107B1 (en) | 2013-06-14 |
| WO2008007387A1 (en) | 2008-01-17 |
| CN101365810A (en) | 2009-02-11 |
| KR20090031495A (en) | 2009-03-26 |
| AT505201B1 (en) | 2010-06-15 |
| ZA200803129B (en) | 2009-01-28 |
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