WO2001019532A1 - Systeme de commande de fumee - Google Patents

Systeme de commande de fumee Download PDF

Info

Publication number
WO2001019532A1
WO2001019532A1 PCT/US2000/021973 US0021973W WO0119532A1 WO 2001019532 A1 WO2001019532 A1 WO 2001019532A1 US 0021973 W US0021973 W US 0021973W WO 0119532 A1 WO0119532 A1 WO 0119532A1
Authority
WO
WIPO (PCT)
Prior art keywords
kettle
air
curtain
plenums
hood
Prior art date
Application number
PCT/US2000/021973
Other languages
English (en)
Inventor
Ronald W. Kalka
Werner Niehaus
Lars Baumgürtel
Original Assignee
Kalka Ronald W
Werner Niehaus
Baumguertel Lars
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kalka Ronald W, Werner Niehaus, Baumguertel Lars filed Critical Kalka Ronald W
Priority to AU74701/00A priority Critical patent/AU7470100A/en
Publication of WO2001019532A1 publication Critical patent/WO2001019532A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F9/00—Use of air currents for screening, e.g. air curtains
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor

Definitions

  • This invention relates to a fume control system for galvanizing kettles and optionally also related fluxing steps .
  • a method of controlling fumes emitted from a galvanizing kettle comprises : admitting air to an upper periphery of the kettle so that heat from the kettle warms the air and causes it to convect upwardly in a first inner curtain at least partially surrounding and entraining fumes from the kettle, impelling air from a blower upwardly through slots in plenums at least partly surrounding a base of the first curtain, and deflecting the air impelled through the slots to converge inwardly towards the first air curtain so as to form a second air curtain, the second curtain protecting the first air curtain and guiding it upwardly towards a hood supported above the kettle by a distance at least sufficient to permit racks supporting articles to be galvanized to be conveyed over and away from the kettle, and to be lowered into and withdrawn from the kettle without obstruction by the hood, and withdrawing air from the hood comprising that portion of the first air curtain containing the fumes .
  • the invention also extends to apparatus for carrying out the above method.
  • the invention provides a method of removing excess flux from, and drying and preheating articles supported on racks to be dipped into the galvanizing bath contained by the kettle, comprising moving each rack to a station adjacent arrays of nozzles directed towards the racks, and supplied through plenums by an air blower, to blow off excess flux and dry the remainder, thus reducing fume production during galvanizing.
  • the same blower is used to supply the nozzles as is used to generate the second air curtain.
  • the blower may draw air from a pit in which the galvanizing kettle is located.
  • Fig. 3 is a plan view of the installation from beneath its hood
  • Fig. 4 is a plan view of the installation from above the hood
  • Fig. 5 is a cross-sectional view of a header used in the installation
  • Fig. 6 is a diagrammatic transverse section illustrating certain air flows within the installation
  • Fig. 7 is a plan view corresponding to Fig. 4 of a modified installation
  • Fig. 8 is a diagrammatic longitudinal vertical section through the embodiment of Fig. 7;
  • Fig. 9 is a diagrammatic plan view of apparatus for removing excess flux and flux drying of racks of articles prior to submersion in the galvanizing bath in the kettle;
  • Fig. 10 is a transverse section in the line A-A in Fig. 9;
  • Fig. 11 is a diagrammatic plan view corresponding to Fig. 9 of an alternative embodiment of apparatus.
  • Fig. 12 is a transverse section on the line A-A in Fig. 11.
  • a rectangular kettle or tank 2 holds a bath 4 of molten zinc into which racks of cleaned and fluxed articles, typically of steel, can be dipped to galvanize them in accordance with normal techniques for dip galvanizing.
  • the bath is maintained above the melting point of zinc, and, as a result, the dipping of the racks 6 (see Figs. 10 and 12) of articles results in the release of fumes from the flux.
  • the bath also represents a substantial source of heat which is imported to air above the bath, causing it to decrease in density and be displaced upwardly by cooler air flowing inwards over the inner rim 8 of the bath.
  • a fan 28 supplied to the plenums by a fan 28 and need be at no greater pressure than is necessary to provide the secondary curtain 18 with sufficient velocity that it can act to contain the inner curtain sufficiently to align the latter with the hood 10 and provide it with sufficient resistance to displacement by drafts that its alignment with the hood may be maintained under normally-encountered operating conditions.
  • Operating pressure need be no more than 0.1 atmospheres, and usually much less. It may be advantageous to control the airflow from the fan so that velocity of the second curtain can be enhanced under adverse conditions resulting in stronger than usual drafts.
  • 1-4 shows four plenums 22 surrounding most of the rim of the kettle (sufficient space should be provided between or behind the plenums to permit a free flow of convection air) , it may not be necessary to provide plenums on all four sides . Thus sufficient protection may be provided in some cases by provision of longitudinal plenums only, as in the embodiment of Figs. 7 and 8, or walls or barriers may be provided extending from the hood 10 to the pit 30 in which the kettle 2 is located on certain sides, with plenums only being provided on that side or sides from which unobstructed crane access is required.
  • Fig. 6 diagrammatically illustrates how the second air curtain confines the convection air curtain that lifts the fumes into the hood 10.
  • the notional margin 32 between the curtains will curve upwardly into the hood leaving a space below the level of the crane rails 14 to accommodate rack being lowered into or removed from the tank 2.
  • the hood 10 is provided with exhaust ducts 34 through which air may be drawn from the hood for discharge or treatment in a bag house or other air cleaning equipment .
  • Figs. 7 and 8 show an elongated kettle or tank 2 suited for the galvanizing of elongated workpieces such as pipes 36 which may be supported in an inclined position so that the fumes are released towards the right hand end of the tank as shown in the Figures.
  • plenums 22 which provide the second air curtain are provided adjacent only right hand positions of the longitudinal edges of the rim of the bath, and the hood 10 may be mounted on a swivel column 38 so that it may be swung out of the way along an arc 40 to allow clearance above the bath when the pipes are supported above the bath by the crane (not shown in these figures) prior to or after being dipped.
  • Racks of articles to be hot dip galvanized undergo various preparatory cleaning and pickling stages, culminating with dipping in a flux bath.
  • the articles on the racks are drip-dried after being removed from the flux bath and before being dipped, but such drip- dried articles may retain excessive flux which may be inadequately dried.
  • a further aspect of the invention provides a system which precedes the galvanizing kettle by a station in which excess flux is removed and the remaining flux force dried by moving the racks of flux-dipped articles to be dipped adjacent one or more stations in which multiple air jets are directed at the racks so as to blow off excess flux and blow dry the remainder. In the arrangement shown in Figs.
  • the racks 6 are lowered into one end of a concrete trough 42 and then moved longitudinally of the trough along rails 50 past a location at which orifices in plenums 44 direct air jets 46 towards the articles 48 on the racks. After excess flux has been blown off, the racks are moved further along the rails 50 to a station at the other end of the trough in which they are blow dried by a similar plenum and jet arrangement before the racks are lifted and conveyed to the galvanizing kettle.
  • the racks are simply lowered into the trough 42 adjacent the plenums 44 so as to blow off the excess flux and dry the remainder, without being moved along the trough.
  • Figs. 11 and 12 The arrangement of Figs. 11 and 12 is similar, except that the racks are conveyed through U-shaped plenums 52 with jet orifices 54. Several such plenums may be spaced along the trough 42, in which case it may not be necessary to move the racks along the trough..
  • the plenums 44 or 52 are fed with air from the same fan 28 as the plenums
  • This fan 28 advantageously draws input air from the pit 30 surrounding the kettle to take advantage of preheating of the air by heat escaping from the kettle 2.
  • Timing of the flux blowing, drawing and dipping steps, and control of the airflow may be arranged to stagger the demands made on the fan and minimize energy requirements .

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Coating With Molten Metal (AREA)

Abstract

L'invention concerne des fumées émises par une cuve de galvanisation (2), commandées par admission d'air vers une périphérie supérieure de la cuve de sorte que la chaleur qui sort de la cuve (2) réchauffe l'air et entraîne la circulation ascendante de celui-ci dans un premier rideau interne entourant et entraînant, au moins en partie, les fumées provenant de la cuve (2). Le procédé consiste ensuite à souffler de l'air, vers le haut, depuis un ventilateur, à travers des ouvertures (20) ménagées dans des plenums (22) entourant, au moins en partie, une base du premier rideau; puis à diriger l'air soufflé à travers les ouvertures (20) pour qu'il converge vers l'intérieur contre ledit premier rideau de manière à former un second rideau d'air (18). Le second rideau (18) protège le premier rideau et le guide dans une direction ascendante contre une hotte (10) maintenue au-dessus de la cuve (2) à une distance au moins suffisante pour permettre aux éléments de support de baie, devant être galvanisés, d'être dirigés par dessus et à distance de la cuve (2), et d'être abaissés dans et retirés de la cuve (2) sans être gênés par la hotte (10).
PCT/US2000/021973 1999-09-15 2000-09-15 Systeme de commande de fumee WO2001019532A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU74701/00A AU7470100A (en) 1999-09-15 2000-09-15 Fume control system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US15394999P 1999-09-15 1999-09-15
US60/153,949 1999-09-15

Publications (1)

Publication Number Publication Date
WO2001019532A1 true WO2001019532A1 (fr) 2001-03-22

Family

ID=22549384

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/021973 WO2001019532A1 (fr) 1999-09-15 2000-09-15 Systeme de commande de fumee

Country Status (2)

Country Link
AU (1) AU7470100A (fr)
WO (1) WO2001019532A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2011007C2 (en) * 2013-06-19 2014-12-22 Biddle B V Air curtain device for realising an air curtain with a substantial vertical air flow and method there for.
CN106834995A (zh) * 2017-02-20 2017-06-13 李培芹 一种热镀锌风幕侧吸锌烟环保装置
CN108486515A (zh) * 2018-05-25 2018-09-04 梁晓翠 一种环保型热浸镀锌设备
CN109371348A (zh) * 2018-12-28 2019-02-22 巩义市恒星金属制品有限公司 钢丝镀锌装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834293A (en) * 1972-11-22 1974-09-10 L Danieli Equipment for conveying smokes and products of the combustion in a smelting furnace
US3943270A (en) * 1973-03-01 1976-03-09 Foseco International Limited Aqueous flux for hot dip galvanising process
FR2311600A1 (fr) * 1975-04-30 1976-12-17 Thevenard Paul Systeme d'aspiration, notamment pour bains de galvanisation de grande surface
US4336279A (en) * 1978-07-04 1982-06-22 Metzger Wesley A Apparatus and process for drying and curing coated substrates
US5167572A (en) * 1991-02-26 1992-12-01 Aerospace Engineering And Research Consultants Limited Air curtain fume cabinet and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3834293A (en) * 1972-11-22 1974-09-10 L Danieli Equipment for conveying smokes and products of the combustion in a smelting furnace
US3943270A (en) * 1973-03-01 1976-03-09 Foseco International Limited Aqueous flux for hot dip galvanising process
FR2311600A1 (fr) * 1975-04-30 1976-12-17 Thevenard Paul Systeme d'aspiration, notamment pour bains de galvanisation de grande surface
US4336279A (en) * 1978-07-04 1982-06-22 Metzger Wesley A Apparatus and process for drying and curing coated substrates
US5167572A (en) * 1991-02-26 1992-12-01 Aerospace Engineering And Research Consultants Limited Air curtain fume cabinet and method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2011007C2 (en) * 2013-06-19 2014-12-22 Biddle B V Air curtain device for realising an air curtain with a substantial vertical air flow and method there for.
WO2014204298A1 (fr) * 2013-06-19 2014-12-24 Biddle B.V. Dispositif de rideau d'air permettant de réaliser un rideau d'air avec un flux d'air vertical important et procédé associé
CN106834995A (zh) * 2017-02-20 2017-06-13 李培芹 一种热镀锌风幕侧吸锌烟环保装置
CN106834995B (zh) * 2017-02-20 2019-06-04 浙江冠明电力新材股份有限公司 一种热镀锌风幕侧吸锌烟环保装置
CN108486515A (zh) * 2018-05-25 2018-09-04 梁晓翠 一种环保型热浸镀锌设备
CN109371348A (zh) * 2018-12-28 2019-02-22 巩义市恒星金属制品有限公司 钢丝镀锌装置
CN109371348B (zh) * 2018-12-28 2024-02-09 巩义市恒星金属制品有限公司 钢丝镀锌装置

Also Published As

Publication number Publication date
AU7470100A (en) 2001-04-17

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