EP0265707B1 - Verfahren und Anordnung zur thermo-mechanischen Regenerierung von Schüttgütern, insbesondere von Giesserei-Altsandt - Google Patents

Verfahren und Anordnung zur thermo-mechanischen Regenerierung von Schüttgütern, insbesondere von Giesserei-Altsandt Download PDF

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Publication number
EP0265707B1
EP0265707B1 EP87114398A EP87114398A EP0265707B1 EP 0265707 B1 EP0265707 B1 EP 0265707B1 EP 87114398 A EP87114398 A EP 87114398A EP 87114398 A EP87114398 A EP 87114398A EP 0265707 B1 EP0265707 B1 EP 0265707B1
Authority
EP
European Patent Office
Prior art keywords
fluidized bed
bed furnace
sand
arrangement according
silo
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.)
Expired - Lifetime
Application number
EP87114398A
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German (de)
English (en)
French (fr)
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EP0265707A3 (en
EP0265707A2 (de
Inventor
Norbert Becker
Michael Dipl.-Ing. Gross
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Forder- und Anlagentechnik GmbH
Original Assignee
Forder- und Anlagentechnik GmbH
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Publication date
Application filed by Forder- und Anlagentechnik GmbH filed Critical Forder- und Anlagentechnik GmbH
Priority to AT87114398T priority Critical patent/ATE76794T1/de
Publication of EP0265707A2 publication Critical patent/EP0265707A2/de
Publication of EP0265707A3 publication Critical patent/EP0265707A3/de
Application granted granted Critical
Publication of EP0265707B1 publication Critical patent/EP0265707B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/18—Plants for preparing mould materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C5/00—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose
    • B22C5/08—Machines or devices specially designed for dressing or handling the mould material so far as specially adapted for that purpose by sprinkling, cooling, or drying
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S241/00—Solid material comminution or disintegration
    • Y10S241/10—Foundry sand treatment

Definitions

  • the invention relates to an arrangement for the thermo-mechanical regeneration of bulk materials, in particular of foundry sands, in which the used sand to be regenerated is heated in a fluidized bed furnace to a temperature exceeding 750 ° C.
  • the molding sand used in foundries is used to process it with the additives that secure it.
  • a molding sand used in this way can, however, only be partially reused at best.
  • Both the procurement of new sand and the disposal of old sand in landfills prove to be disadvantageously costly. Especially since the disposal of the old sand, for example by depositing it in landfills, is becoming more difficult and more expensive due to increasing environmental awareness.
  • thermal and mechanical as well as wet-chemical and thermo-mechanical processes for the regeneration of used sand are therefore known.
  • the thermal, mechanical and wet-chemical processes are not economically justifiable here
  • DE-C1-3 516 191 recommends that bulk materials of this type to be decoated slide over floors in a metered thin layer, which allows the sliding bulk material to be heated by infrared rays.
  • Such arrangements are praised as inexpensive, small and compact, and particularly flexible in terms of throughput, but the heating and throughput that can be achieved have proven to be both inadequate and uneconomical.
  • Thermal stripping with the aid of fluidized bed furnaces with a relatively large content is also listed.
  • Such fluidized bed furnaces are explained and illustrated, for example, in Gmelin-Durrer, Metallurgy of Iron, 1964 Weinheim, 4th edition, volume 1a, page 62a and volume 1b, page 62b, Fig. 252, and also the foundry practice, Issue No. 17, 1984, Berlin, shows on pages 293 to 297 on page 295 a process flow diagram of a regeneration process using a fluidized bed furnace 8.
  • these fluidized bed furnaces are fed centrally, so that for the thermal stripping of the sand, fluidized bed furnaces with a relatively large content are used, which prove to be disadvantageously costly and can only be used for large throughput quantities.
  • the central feed results in different dwell times of the sand in the furnace, which further reduce the throughput actually achieved and thus the economy. Furthermore, such fluidized bed furnaces do not ensure continuous, trouble-free operation, since heavy foreign bodies, for example cast spatter, settle on the furnace bed with increasing operating time and thus further reduce the furnace output.
  • the invention aims at a powerful, continuously operable and in particular profitable arrangement of the described To create genus, the starting product can be used without restrictions like new sand.
  • the fluidized bed furnace used is equipped with a forced discharge device, which transports the bulk material in a layer of a predetermined, relatively lower level, the complete whirling of which ensures the level is completely horizontal through the hearth chamber of the fluidized bed furnace over its entire length to a transfer device which does this Throws bulk material into a discharge silo, and in that the bottom of the fluidized bed furnace is porous and / or is provided with openings or nozzles through which combustion air and heating gases and / or a heating gas / air mixture are fed to the hearth of the fluidized bed furnace.
  • the bulk material guided in a direct, largely constant current through the hearth of the fluidized bed furnace is heated to such a high temperature, with constant swirling, that both the crystalline binders are removed from the crystal water and the organic binder materials are burnt completely, so that the grains of the bulk material connect and envelop Binder residues are completely destroyed.
  • the swirling in connection with the forced discharge is not only able to completely remove binding residues adhering to grains of the bulk material by mutual friction, but also heavier admixtures, such as, for example, casting splashes, sprue parts or the like, are safely removed from the hearth of the fluidized bed furnace, so that interference effects can be avoided by congestion in the stove area.
  • a silo 1 for receiving old sand to be processed, which is designed to be closable by means of a closure 2 after the loading of a batch if the closure alone is not considered sufficient by the good column.
  • a metering device 3 At its lower end there is a metering device 3, which has two metering plates 5 and 6, one above the other, with openings, at least one of which can be set in vibration by means of a vibrator 4.
  • This metering device allows metered removal from the silo 1.
  • the material released by the metering device 3 is fed into the hearth of a fluidized bed furnace 8 via a closing funnel 7 in such a way that it covers the bottom 9 thereof in a good layer 10 of a predetermined height.
  • the bottom 9 is vibrated by vibrators 11 in such a way that the material undergoes a loosening vertical acceleration and on the other hand in the conveying direction, i.e. to the right in the figure, is slowly moved towards a transfer device 12.
  • the layer height is stabilized by one or more retaining webs 13.
  • the sand falls into a transfer silo 14, in which the sand is cooled down to a favorable processing temperature.
  • the sasnd is fed into a penumatic conveyor 16 via a trigger 15 and fed to a classifier 19 via a delivery line 17.
  • the delivery line 17 is provided with an acceleration nozzle 18, and the accelerated sand is blown into an impact bell 20 so that any impact of the burned binder is released from the grains of sand by the impact.
  • the sand entered into the silo 1 is metered into the hearth of the fluidized bed furnace (8) by the mutual movements of the metering plates 5 and 6.
  • Sand tubers and larger core pieces are placed in the feed hopper 28, which is suitably equipped with a good lock in order to prevent the escape of smoke gases.
  • Released tubers slide down a chute 26 or a corresponding grate and lie in front of the grate 27 until thermal decay has occurred to such an extent that the released sand is able to pass through the narrow grates. Any metal parts that may accumulate can be removed from the furnace via the chamber door 29.
  • the air required for combustion is sucked in by means of a blower 30 and pressed through the heat exchangers 31 provided in the upper part of the discharge silo 14, so that the regenerated sand which is emitted from the fluidized bed furnace (8) at, for example, 750.degree. C. while heating the combustion air to, for example Is cooled to 200 to 300 ° C.
  • the gas intended for combustion is transferred to the fluidized bed furnace Pipes 33 supplied while the preheated supply air is removed from the heat exchangers 31 of the discharge silo 14. Gas and combustion air are fed into the chambers 32 provided under the porous base 9 and mix there to form a combustible gas mixture.
  • the combustion takes place effectively within the whirled-up material layer 10 or directly above it, so that effective heating with high efficiency is achieved.
  • the flue gases formed in the fluidized bed furnace 8 are fed via a flue gas line 34 to a series of heat exchangers 35 operated in series, which are arranged in the lower regions, in the exemplary embodiment in the lower two thirds of the silo 1.
  • the flue gases are then fed via an exhaust pipe 37 via a collector in the direction of arrow 25, expediently via a filter, a chimney, a fireplace or the like.
  • the flue gases give off the essential part of their heat content practically in countercurrent when they flow through the heat exchangers 35 and heat the old sand in the silo 1 to be regenerated to, for example, 300 ° C., so that the fluidized bed furnace is already loaded with material that is at that temperature is preheated to which conventional thermal processes heat the goods as a whole.
  • the silo 1 By closing the silo 1 through its closure 2, but in the absence of such a closure, however, due to sand masses present above the heat exchangers, the waste gases arising during this preheating are conducted via the funnel 7 into the hearth of the fluidized bed furnace 8, in which they burn completely and , extracting with the exhaust air, can no longer be regarded as environmentally hazardous.
  • the optimum processing temperature for molding sand is around 25 ° C.
  • further heat exchangers 39 which, interspersed with cooling water, cool the regenerated sand down to the temperature recognized as appropriate.
  • a heat exchanger 31, 35 and 39 is shown in section.
  • Several parallel tubes (41) are connected to a common heat transfer plate 42, so that there are large contact surfaces to the sand.
  • the heat exchanger can also have an elliptical cross-section with tubes onto which the heat-conducting plates 42 are pressed and / or with this are welded. The longer axis of the tube is expediently vertical.
  • the heat exchangers 31 and 39 can be designed in the same way, but in particular the heat exchangers 39 through which cooling water flows can have pipes of smaller cross-section.
  • the heat-conducting sheets which mediate contact with the bulk material can be drawn onto the pipe; but there is also the possibility, in a manner known per se, of winding sheet metal strip onto the pipes in a helical manner and, if appropriate, welding them at the base.
  • one or more retaining webs 13 in the hearth of the fluidized bed furnace 8 on the base 9 thereof can have recesses 44 on their upper side. But essential are on their underside facing the bottom 9 recesses 43, which allow the passage of non-fluidizable material, such as cast splatter, ceramic parts, etc., so that clogging of the stove by such foreign objects is reliably prevented. It has been found that, for example, 25 ° C. can be considered the most favorable processing temperature for the regenerated sand, since at this temperature the binder sets neither too quickly nor too slowly and has proven to be particularly effective. The cooling in the transfer silo 14 is therefore expediently regulated.
  • a temperature sensor provided at the output detects the actual value of the output temperature, and a solenoid valve 38 is provided as an actuator of the control device, which allows the control to be carried out relatively simply and inexpensively as a so-called two-point control; the cooling water is then discharged via the waste water line 40.
  • the cooling streams of the heat exchangers are not shown in FIG. 1.
  • the heat exchangers 31 and 35 through which air flows it has proven useful to carry out the diversion from one heat exchanger to the higher one via deflection chambers 36 and 45, respectively.
  • These, their outer walls or in each case over the faces of the mouths of the heat exchangers can be designed to be removable, so that in particular the heat exchangers 35 through which the flue gases flow can be easily cleaned.
  • the invention can be varied; However, it has been shown that binder layers are reliably destroyed when heated to correspondingly high temperatures. On the other hand, heating to such high temperatures ensures that the flue gases released in this process are free of environmentally harmful constituents and essentially of nitrogen, There is water vapor and carbon dioxide so that the flue gas can be safely discharged through chimneys, food or the like, after filtering.
  • the heat exchangers 31 and 35 ensure a desired high efficiency of the arrangement, so that the fuel consumption remains pleasantly low and high efficiency can be achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
EP87114398A 1986-10-27 1987-10-02 Verfahren und Anordnung zur thermo-mechanischen Regenerierung von Schüttgütern, insbesondere von Giesserei-Altsandt Expired - Lifetime EP0265707B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87114398T ATE76794T1 (de) 1986-10-27 1987-10-02 Verfahren und anordnung zur thermo-mechanischen regenerierung von schuettguetern, insbesondere von giesserei-altsandt.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3636479 1986-10-27
DE19863636479 DE3636479A1 (de) 1986-10-27 1986-10-27 Verfahren und anordnung zur thermo-mechanischen regenerierung von schuettguetern, insbesondere von giesserei-altsand

Publications (3)

Publication Number Publication Date
EP0265707A2 EP0265707A2 (de) 1988-05-04
EP0265707A3 EP0265707A3 (en) 1988-08-17
EP0265707B1 true EP0265707B1 (de) 1992-06-03

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87114398A Expired - Lifetime EP0265707B1 (de) 1986-10-27 1987-10-02 Verfahren und Anordnung zur thermo-mechanischen Regenerierung von Schüttgütern, insbesondere von Giesserei-Altsandt

Country Status (4)

Country Link
US (1) US4821654A (enrdf_load_stackoverflow)
EP (1) EP0265707B1 (enrdf_load_stackoverflow)
AT (1) ATE76794T1 (enrdf_load_stackoverflow)
DE (2) DE3636479A1 (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0343272A1 (de) * 1988-05-26 1989-11-29 Pohl Giessereitechnik Verfahren und Vorrichtung zum Regenieren von Giessereialtsanden
EP0505722A1 (de) * 1991-03-27 1992-09-30 Alb. Klein GmbH & Co. KG Verfahren zum Regenerieren von Haufwerk aus beschichteten Körnern, insbesondere Giessereialtsanden
EP0512236A1 (de) * 1991-04-10 1992-11-11 KGT GIESSEREITECHNIK GmbH Verfahren zur mechanischen Reinigung von Giessereialtsand
EP0465778A3 (en) * 1990-06-28 1993-04-14 Kuenkel-Wagner Gmbh & Co.Kg Process for reclaiming used foundry sand
WO2003061873A1 (en) * 2002-01-23 2003-07-31 Pec Technologies Limited A method of treating sand

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3903604C1 (en) * 1989-02-08 1990-03-29 Siempelkamp Giesserei Gmbh & Co, 4150 Krefeld, De Process for regenerating moulding sand
IT1237296B (it) * 1989-11-28 1993-05-27 Metodo per il recupero delle sabbie di fonderia esauste mediante arrostimento.
DE4015031A1 (de) * 1990-05-10 1991-11-14 Kgt Giessereitechnik Gmbh Verfahren zum thermischen regenerieren von in giessereien anfallenden altsanden, sowie zur behandlung der im sandkreislauf anfallenden staeube
US5027721A (en) * 1990-09-21 1991-07-02 Enviro-Klean Soils, Inc. Method and apparatus for cleaning contaminated soil
US5111756A (en) * 1990-09-21 1992-05-12 Enviro-Klean Soils, Inc. Apparatus for cleaning contaminated soil
US5251565A (en) * 1990-12-13 1993-10-12 Shell Oil Company Process and apparatus for removal of carbonaceous materials from particles containing such materials
DE4102168C2 (de) * 1991-01-25 1994-10-20 Klein Alb Gmbh Co Kg Verfahren und Vorrichtung zum Verbrennen von Staub
DE4126976C1 (enrdf_load_stackoverflow) * 1991-08-14 1993-01-07 Kuenkel-Wagner Gmbh & Co Kg, 3220 Alfeld, De
US5127343A (en) * 1991-10-16 1992-07-07 Terrachem Environmental Services, Inc. Hydrocarbon extractor
DE4215867A1 (de) * 1992-05-14 1993-11-18 Kgt Giessereitechnik Gmbh Verfahren und Vorrichtung zur Regelung des Sandaustrages bei der thermischen Regenerierung von Gießerei-Altsand in Wirbelschichtöfen
DE4316610A1 (de) * 1993-05-18 1994-11-24 Gut Gieserei Umwelt Technik Gm Öko-Sandregenerierung mech./pneum. im Chargenbetrieb
FR2730653B1 (fr) * 1995-02-16 1997-05-09 Fm Ind Procede de regeneration par degangage thermique de sables de fonderie usages
DE19631788A1 (de) * 1996-08-07 1998-02-12 Inutec Ingenieure Fuer Ind Umw Anordnung zur thermischen Aufbereitung von Formsand aus dem Vollformgießverfahren
SE513607C2 (sv) 1999-02-03 2000-10-09 Ruben Larsson Apparat för behandling och transport av ett material i fluidiserad bädd
JP3355325B2 (ja) * 2000-05-18 2002-12-09 旭有機材工業株式会社 原料鋳物砂又はシェルモールド用レジンコーテッドサンドの温度調節ユニット及びこれを用いた温度調節装置
KR101161779B1 (ko) * 2010-09-09 2012-07-03 한전원자력연료 주식회사 Ｕ3ｏ8 분말 제조장치
US9109531B2 (en) * 2012-01-09 2015-08-18 Honda Motor Co., Ltd. Method for testing casting quality and apparatus therefor
CN104043772A (zh) * 2014-06-20 2014-09-17 中机中联工程有限公司 铸造旧砂热法再生系统
CN109093065A (zh) * 2018-10-11 2018-12-28 深圳清大同科生态环境有限公司 一种余热利用的覆膜砂生产系统
US11566504B2 (en) 2019-07-17 2023-01-31 Weatherford Technology Holdings, Llc Application of elastic fluids in hydraulic fracturing implementing a physics-based analytical tool

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
US3841240A (en) * 1973-07-06 1974-10-15 Sola Basic Ind Inc Continuous fluid bed wire burn-off apparatus and method
US4508277A (en) * 1980-09-08 1985-04-02 Andrews Robert S L Apparatus for reclaiming foundry sand
US4628838A (en) * 1980-11-19 1986-12-16 Peabody Engineering Corp. Fluidized bed combustion method
DE3103030C2 (de) * 1981-01-30 1984-05-03 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren zur Gewinnung von Gießereisand aus gebrauchtem Gießereisand
NL8500860A (nl) * 1985-03-25 1986-10-16 Esmil Bv Werkwijze voor het reinigen van vervuilde grond.
DE3516191C1 (de) * 1985-05-06 1990-11-15 Gerd Dipl.-Ing. 7448 Wolfschlugen Pritschow Verfahren und Vorrichtung zur thermischen Entschichtung umhuellter Schuettgueter
US4708775A (en) * 1985-07-08 1987-11-24 Anachemia Solvents Limited Disposal of wastes with solvent recovery
US4667609A (en) * 1986-09-08 1987-05-26 Robert Hardison Apparatus and method for treatment of soil contaminated with hydrocarbons

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0343272A1 (de) * 1988-05-26 1989-11-29 Pohl Giessereitechnik Verfahren und Vorrichtung zum Regenieren von Giessereialtsanden
US5045090A (en) * 1988-05-26 1991-09-03 Pohl Giesserreitechnik Process and device for reclaiming used foundry sands
EP0465778A3 (en) * 1990-06-28 1993-04-14 Kuenkel-Wagner Gmbh & Co.Kg Process for reclaiming used foundry sand
EP0505722A1 (de) * 1991-03-27 1992-09-30 Alb. Klein GmbH & Co. KG Verfahren zum Regenerieren von Haufwerk aus beschichteten Körnern, insbesondere Giessereialtsanden
EP0512236A1 (de) * 1991-04-10 1992-11-11 KGT GIESSEREITECHNIK GmbH Verfahren zur mechanischen Reinigung von Giessereialtsand
WO2003061873A1 (en) * 2002-01-23 2003-07-31 Pec Technologies Limited A method of treating sand
GB2399528A (en) * 2002-01-23 2004-09-22 Pec Technologies Ltd A method of treating sand

Also Published As

Publication number Publication date
DE3636479C2 (enrdf_load_stackoverflow) 1990-09-13
EP0265707A3 (en) 1988-08-17
ATE76794T1 (de) 1992-06-15
DE3779560D1 (de) 1992-07-09
US4821654A (en) 1989-04-18
DE3636479A1 (de) 1988-05-05
EP0265707A2 (de) 1988-05-04

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