WO2002103067A2 - Verfahren zum einschmelzen von aluminium in einem schachtschmelzofen - Google Patents
Verfahren zum einschmelzen von aluminium in einem schachtschmelzofen Download PDFInfo
- Publication number
- WO2002103067A2 WO2002103067A2 PCT/EP2002/006472 EP0206472W WO02103067A2 WO 2002103067 A2 WO2002103067 A2 WO 2002103067A2 EP 0206472 W EP0206472 W EP 0206472W WO 02103067 A2 WO02103067 A2 WO 02103067A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- furnace
- burner
- gas
- oxygen
- exhaust gas
- Prior art date
Links
Classifications
-
- 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
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/26—Arrangements of controlling devices
-
- 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
- C22B21/00—Obtaining aluminium
- C22B21/0084—Obtaining aluminium melting and handling molten aluminium
-
- 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
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
-
- 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
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
-
- 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
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/04—Circulating atmospheres by mechanical means
- F27D2007/045—Fans
Definitions
- the present invention relates to a process for melting aluminum, comprising the steps of: feeding an aluminum-containing feed to a furnace, preheating the feed by furnace exhaust gas in an upper region of the furnace, and heating the feed by means of at least one burner to form an aluminum melt in a lower Area of the furnace, wherein an oxygen-rich gas and fuel are fed to the burner and a burner flame which acts on the feed material in the melting region and contributes to the furnace exhaust gas is thus generated.
- Shaft melting furnaces are frequently used in aluminum foundries, in which feedstocks are melted in the form of aluminum bars, cycles or scrap.
- the flue gas from the burner from the holding area and the melting area is used to preheat the feed materials. These are charged into the furnace shaft, preheated there as they sink, and melted in the lower area by means of burners.
- the molten aluminum flows over a melting bridge into a stove area, which is required as a collector and for adjusting the temperature.
- the shaft melting furnaces are usually designed for a certain burner output. Increasing the burner output for the purpose of increasing the melting capacity therefore generally also requires an adaptation of the exhaust gas routing and the filter system.
- the invention has for its object to modify the process for melting aluminum-containing feed material using an oxygen-rich gas so that the associated disadvantages with regard to the preheating of the aluminum insert are avoided.
- this object is achieved according to the invention in that the furnace exhaust gas is drawn off in the upper region of the furnace and is at least partially reintroduced as recirculated, heated gas in the lower region.
- oxygen-rich gas is understood to mean oxygen or air enriched with oxygen.
- the furnace exhaust gas mainly consists of the combustion products CO 2 and H 2 O. It is drawn off from the furnace and fed back to it as recirculated gas. By re-introducing the furnace exhaust gas or one Part of it as "heated, recirculated gas", the reduction in burner exhaust gas associated with the use of the oxygen-rich gas can be fully or partially compensated for. The additional amount of gas inside the furnace improves the convective heat transfer for preheating the feed material in the furnace shaft.
- a particular advantage of this procedure compared to feeding in additional air is that the furnace exhaust gas - when using an oxygen burner - is essentially nitrogen-free and thus the NO ⁇ formation is reduced.
- Another advantage is that the recirculated gas is already heated and thus contributes to better energy utilization. The The amount of heat from the recirculated gas additionally increases the melting capacity of the furnace.
- One or more burners are provided.
- the recirculated gas is fed to the at least one burner.
- An additional opening in the furnace wall for introducing the recirculated gas and a corresponding modification of an existing furnace can thus be avoided.
- the furnace waste gas is preferably drawn off by means of a blower and at the same time serves to feed the furnace waste gas - or a part thereof - back to the burner as recirculated gas.
- the fan thus ensures the circulation of the furnace exhaust gas. By changing the fan speed, the amount of furnace exhaust gas removed can be adapted to the requirements.
- a controllable hot gas blower is particularly suitable for this purpose.
- the oxygen content of the furnace atmosphere is measured and the measured value is used as a manipulated variable for regulating an oxygen supply to the burner. This makes it possible to keep the stoichiometry of the burner flame constant with respect to oxygen.
- the measurement of the oxygen content in the furnace atmosphere ensures a stable and reproducible melting process by regulating the flame stoichiometry.
- This also plays a role in a further advantageous development of the invention, in which combustible components of the furnace atmosphere are afterburned in the fan.
- the afterburning removes combustible components of the furnace atmosphere, such as oil on aluminum chips, from the furnace exhaust gas and thus ensures stable combustion.
- a controlled supply of oxygen is advantageous for this, which is ensured by measuring the oxygen content in the furnace atmosphere.
- the recirculated gas is introduced into the furnace above and / or below the burner flame.
- the recirculated gas is colder than the burner flame and therefore helps to reduce its temperature. This reduces the formation of NO x .
- the vault is additionally protected against the radiation from the burner flame, and wear is thereby prevented
- the recirculated gas is ideally introduced into the furnace in such a way that it envelops the burner flame.
- the method according to the invention is explained in more detail below using an exemplary embodiment.
- the exemplary embodiment relates to the retrofitting of a shaft melting furnace previously operated with air burners for aluminum ingots and circuit material with oxygen burners.
- the aluminum is automatically fed into the shaft, preheated there as it sinks and melted with burners.
- the molten metal flows into a stove area, which is required as a collector and for adjusting the temperature.
- the exhaust gas is used to preheat the solid aluminum.
- oxygen burners built into a ceramic block were used to convert the furnace accordingly.
- the ceramic block is simply installed in the wall of the furnace. It is not necessary to cool the burner.
- the furnace was therefore additionally equipped with a hot gas recirculation.
- a hot gas blower was installed at the upper end of the furnace shaft, by means of which the combustion exhaust gas is drawn off and returned to the furnace via the burner.
- the exhaust gas exits the burner via an annular outer nozzle so that the furnace flame is enveloped by hot furnace gas. This shielding of the burner flame protects the refractory lining from overheating.
- the flame temperature and the nitrogen content in the furnace atmosphere are reduced, thereby reducing NOx formation.
- a speed control is installed to control the output of the hot gas blower.
- the oxygen content of the furnace atmosphere is measured.
- the measured value is used to regulate the oxygen supply to the burners in such a way that the burners are operated with constant flame stoichiometry.
- the temperature of the furnace exhaust gas in the fan is around 1200 ° C.
- the supply of oxygen in the blower enables post-combustion of pyrolysis gas that contains combustible components.
- the shaft melting furnace is operated with two burners, the volume fraction of the furnace exhaust gas supplied being between 2 and 10 times the other burner gases (fuel gases and oxygen), depending on the mode of operation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Details (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2002345607A AU2002345607A1 (en) | 2001-06-19 | 2002-06-12 | Method for melting down aluminium in a shaft furnace |
DE50211788T DE50211788D1 (de) | 2001-06-19 | 2002-06-12 | Verfahren zum einschmelzen von aluminium in einem schachtschmelzofen |
EP02780764A EP1402078B1 (de) | 2001-06-19 | 2002-06-12 | Verfahren zum einschmelzen von aluminium in einem schachtschmelzofen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10129219.8 | 2001-06-19 | ||
DE10129219A DE10129219A1 (de) | 2001-06-19 | 2001-06-19 | Verfahren zum Einschmelzen von Aluminium |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002103067A2 true WO2002103067A2 (de) | 2002-12-27 |
WO2002103067A3 WO2002103067A3 (de) | 2003-11-27 |
Family
ID=7688506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2002/006472 WO2002103067A2 (de) | 2001-06-19 | 2002-06-12 | Verfahren zum einschmelzen von aluminium in einem schachtschmelzofen |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1402078B1 (de) |
AT (1) | ATE387510T1 (de) |
AU (1) | AU2002345607A1 (de) |
DE (2) | DE10129219A1 (de) |
WO (1) | WO2002103067A2 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010029648A1 (de) | 2010-06-02 | 2011-04-07 | Kutzner, Dieter, Dipl.-Ing. | Verfahren zum Schmelzen von Metallen oder Glas oder zur Wärmebehandlung von Metallen |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3759702A (en) * | 1971-04-07 | 1973-09-18 | Chemetron Corp | Method of melting aluminum |
DE2315748A1 (de) * | 1973-03-29 | 1974-12-19 | Wests Manchester Ltd | Schachtofen |
US3982889A (en) * | 1975-07-14 | 1976-09-28 | Olson Benjamin F | Preheating system for aluminum remelt furnace |
US4398501A (en) * | 1980-07-24 | 1983-08-16 | Costruzioni Meccaniche F.B.M.S.P.A. | System for recovering latent and sensible heat of effluent gases from a melting installation |
US4664702A (en) * | 1985-02-04 | 1987-05-12 | Southwire Company | Method of melting aluminum in a vertical shaft furnace |
EP0428117A2 (de) * | 1989-11-16 | 1991-05-22 | VIESSMANN WERKE GmbH & CO. | Heizkessel mit Abgasrückführung zum Brenner |
DE4324111A1 (de) * | 1993-07-20 | 1995-01-26 | Feustel Hans Ulrich Dipl Ing | Verfahren und Vorrichtung zum Brennen von mineralogischen und petrographischen Verbindungen und Gemengen |
US5542839A (en) * | 1994-01-31 | 1996-08-06 | Gas Research Institute | Temperature controlled low emissions burner |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU972202A1 (ru) * | 1981-04-13 | 1982-11-07 | Пензенский Политехнический Институт | Шахтна печь дл плавки алюминиевых сплавов |
JPH04160123A (ja) * | 1990-10-22 | 1992-06-03 | Daido Steel Co Ltd | アルミニウム溶解炉におけるバーナの燃焼制御方法 |
JPH10311688A (ja) * | 1997-05-09 | 1998-11-24 | Nippon Sanso Kk | 金属溶解方法 |
DE19732867A1 (de) * | 1997-07-18 | 1999-01-21 | Linde Ag | Verfahren und Vorrichtung zum Betreiben von Gasbrennern |
DE19917128C1 (de) * | 1999-04-15 | 2000-12-28 | Hans Ulrich Feustel | Roheisenerzeugung mit Sauerstoff und Kreislaufgas in einem koksbeheizten Schachtofen |
-
2001
- 2001-06-19 DE DE10129219A patent/DE10129219A1/de not_active Ceased
-
2002
- 2002-06-12 EP EP02780764A patent/EP1402078B1/de not_active Expired - Lifetime
- 2002-06-12 DE DE50211788T patent/DE50211788D1/de not_active Expired - Lifetime
- 2002-06-12 AU AU2002345607A patent/AU2002345607A1/en not_active Abandoned
- 2002-06-12 WO PCT/EP2002/006472 patent/WO2002103067A2/de active IP Right Grant
- 2002-06-12 AT AT02780764T patent/ATE387510T1/de active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3759702A (en) * | 1971-04-07 | 1973-09-18 | Chemetron Corp | Method of melting aluminum |
DE2315748A1 (de) * | 1973-03-29 | 1974-12-19 | Wests Manchester Ltd | Schachtofen |
US3982889A (en) * | 1975-07-14 | 1976-09-28 | Olson Benjamin F | Preheating system for aluminum remelt furnace |
US4398501A (en) * | 1980-07-24 | 1983-08-16 | Costruzioni Meccaniche F.B.M.S.P.A. | System for recovering latent and sensible heat of effluent gases from a melting installation |
US4664702A (en) * | 1985-02-04 | 1987-05-12 | Southwire Company | Method of melting aluminum in a vertical shaft furnace |
EP0428117A2 (de) * | 1989-11-16 | 1991-05-22 | VIESSMANN WERKE GmbH & CO. | Heizkessel mit Abgasrückführung zum Brenner |
DE4324111A1 (de) * | 1993-07-20 | 1995-01-26 | Feustel Hans Ulrich Dipl Ing | Verfahren und Vorrichtung zum Brennen von mineralogischen und petrographischen Verbindungen und Gemengen |
US5542839A (en) * | 1994-01-31 | 1996-08-06 | Gas Research Institute | Temperature controlled low emissions burner |
Non-Patent Citations (3)
Title |
---|
DATABASE WPI Section Ch, Week 198337 Derwent Publications Ltd., London, GB; Class M22, AN 1983-763556 XP002242084 & SU 972 202 A (PENZA POLY), 17. November 1982 (1982-11-17) * |
PATENT ABSTRACTS OF JAPAN vol. 016, no. 455 (C-0987), 22. September 1992 (1992-09-22) & JP 04 160123 A (DAIDO STEEL CO LTD), 3. Juni 1992 (1992-06-03) * |
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 02, 26. Februar 1999 (1999-02-26) & JP 10 311688 A (NIPPON SANSO KK), 24. November 1998 (1998-11-24) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010029648A1 (de) | 2010-06-02 | 2011-04-07 | Kutzner, Dieter, Dipl.-Ing. | Verfahren zum Schmelzen von Metallen oder Glas oder zur Wärmebehandlung von Metallen |
Also Published As
Publication number | Publication date |
---|---|
DE10129219A1 (de) | 2003-01-09 |
DE50211788D1 (de) | 2008-04-10 |
EP1402078A2 (de) | 2004-03-31 |
ATE387510T1 (de) | 2008-03-15 |
WO2002103067A3 (de) | 2003-11-27 |
EP1402078B1 (de) | 2008-02-27 |
AU2002345607A1 (en) | 2003-01-02 |
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