[go: up one dir, main page]

WO2013017251A1 - Buse d'alimentation pour matériau en poudre ou en granulés - Google Patents

Buse d'alimentation pour matériau en poudre ou en granulés Download PDF

Info

Publication number
WO2013017251A1
WO2013017251A1 PCT/EP2012/003230 EP2012003230W WO2013017251A1 WO 2013017251 A1 WO2013017251 A1 WO 2013017251A1 EP 2012003230 W EP2012003230 W EP 2012003230W WO 2013017251 A1 WO2013017251 A1 WO 2013017251A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
supply nozzle
open end
nozzle according
inlet
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.)
Ceased
Application number
PCT/EP2012/003230
Other languages
English (en)
Inventor
Marcellinus Maria Wilhelmus SCHILDER
Antonius Johannes Petrus BOUWENS
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.)
Tata Steel Nederland Technology BV
Original Assignee
Tata Steel Nederland Technology BV
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 Tata Steel Nederland Technology BV filed Critical Tata Steel Nederland Technology BV
Publication of WO2013017251A1 publication Critical patent/WO2013017251A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/108—Feeding additives, powders, or the like

Definitions

  • the invention relates to a supply nozzle for supplying a powder or granular material to a reservoir wherein the supply nozzle comprises an inlet and connected to the inlet at least one outlet member for the powder or granular material.
  • Such a nozzle is suitable for use in very different applications, for instance for filling a silo with grain or any other powdery or granular material or for supplying casting powder to molten metal or metal alloy in a continuous casting mould.
  • the liquid metal or metal alloy inside a casting mould is kept covered with a layer of casting powder wherein the thickness of said layer is kept constant within certain limits.
  • the function of the casting powder is to prevent the liquid metal from oxidising, to keep the liquid metal in the mould at a certain temperature and to act as a lubricant between the liquid metal and the walls of the mould.
  • the casting powder forms a slag on the liquid metal that spreads out over the surface of the liquid metal and gets entrained between the liquid metal and the walls of the mould by the liquid metal flowing downward in the oscillating casting mould. Because of the consumption of casting powder a continuous supply of new casting powder is needed to keep the layer of casting powder to a more or less constant thickness.
  • a well known method to supply new casting powder is the so called “chicken- feed” method, see for instance US4595045, in which casting powder is supplied from a hopper, through a supply pipe and a supply nozzle at the end of the supply pipe directly on top of the molten metal and slag layer.
  • the pile of accumulated casting powder will shut off the supply till enough of the casting powder has spread out by means of the oscillation of the mould and the entrainment of slag along the walls of the mould, after which the supply will start again until it is shut off again by a pile of accumulated casting powder.
  • an inert gas such as argon gas
  • argon gas is injected in the tundish well nozzle, the slide gate or the upper part of the submerged entry nozzle to protect the nozzle wall from inclusions and clogging.
  • the injected gas is drawn into the mould by the stream of molten metal coming from the tundish and rises in the mould through the molten metal, slag layer and casting powder and is subsequently taken up by an exhaust system with suction means positioned above the mould. With the inert gas disappearing in the exhaust system also part of the casting powder entrained by the inert gas will be lost.
  • a like problem may occur.
  • a silo gas is injected near the outlet in the grain contained in the silo.
  • the injected gas will leave the silo at the top therewith entraining a lot of grain and to prevent that the grain leaves the silo and comes into the environment large and expensive filter systems have to be used.
  • one or more of the above objectives are realized by providing a supply nozzle for supplying a powder or granular material to a container wherein the supply nozzle comprises an inlet and connected to the inlet at least one outlet member with an outlet opening and wherein the at least one outlet member over at least part of the length thereof is surrounded by a housing with a first and second open end with the outlet opening of the at least one outlet member in or near a first open end of the housing.
  • a housing around the nozzle it is realized that if gas escapes at or near the at least one outlet member that with supplying casting powder to a mould for continuous casting at least part of the casting powder that is blown away will settle again within the housing near the outlet member(s).
  • the supply of casting powder will stop as soon as a certain level inside the housing is reached. Although still a part of the casting powder may be blown away and disappear in an exhaust or suction system above the mould, depending on the amount of gas that escapes at or near the outlet member, the loss will be far less than without the housing according the invention.
  • nozzle according to the invention is described in the following on hand of a supply nozzle for casting powder, but it will be understood that the use of the nozzle according the invention is not limited to that use only.
  • the inlet is positioned in or near a second open end of the housing. With the supply nozzle in use the outlet member and the first open end will be positioned below the second open end of the housing.
  • the housing has a first and a second part, the first part having the first open end and the second part having the second open end opposite the first open end of the first part of the housing and wherein the second part of the housing has a tapered shape.
  • the tapering of the second part is such that the largest circumference corresponds to the circumference of the first part of the housing to which it connects.
  • the shape of the housing is chosen such that the motion of the molten metal and slag imposed by the oscillating mould is disturbed as little as possible.
  • Various shapes are possible for the housing, for instance a cylindrical shape for a supply nozzle with a single outlet and a rectangular shape for a supply nozzle with more than one outlet member. With such a rectangular shape the length and width of the first part of the housing will be taken parallel to length and width of the mould.
  • the shape of the housing can for instance also be round independent from the number of outlet members.
  • the second part of the housing has the shape of a truncated pyramid or a truncated cone with the side with the largest circumference connected to the first part of the housing.
  • the circumference of the second open end of the second part of the housing is larger than the circumference of the inlet , if the inlet is positioned in or near the second open end, in order not to not to close off the housing.
  • At least one outlet member is provided at the outlet opening with an end plate.
  • the end plate is provided over the outlet opening of the outlet member. The end plate will lead any escaping gas away from the outlet opening therewith preventing too much supply of casting powder.
  • the end plate has as a supply opening smaller than the outlet opening of the outlet member. This prevents that considerable amount of gas escaping from the molten metal in the mould or from powdery or granular material in a silo can enter the outlet member, therewith preventing that the flow of casting powder or the powdery or granular material in the outlet member is fluidized and/or destabilized resulting in an over-supply of casting powder or powdery or granular material.
  • the surface area of the end plate or end plates is smaller than the surface area of the first open end of the housing at the side of the at least one outlet member.
  • the end plate is large enough to lead the gas over a sufficient distance away from the supply opening. At the same time the surface area is limited in order to leave sufficient surface area of the housing open. Another reason is that with supplying casting powder in a continuous casting mould a large surface area of the end plate could seriously influence the motion or wave pattern of the molten metal, slag and casting powder in the mould therewith limiting the amount of slag formed and the entrainment thereof with the molten metal along the walls of the mould.
  • the motion or wave pattern of the molten metal, slag and casting powder in the mould is relatively low or not present than the size of the end plate may be taken larger.
  • At least one end plate is positioned above the first open end of the housing at the side of the at least one outlet member, that is above the rim of the first open end of the housing.
  • This feature further decreases the influence of the end plate or end plates on the motion or wave pattern of the molten metal, slag and casting powder generated by the oscillating movement of the mould.
  • a further advantage is that with said position of the end plate it is prevented that the end plate and more in particular the supply opening in the end plate might come into contact with the slag layer beneath the casting powder and that the supply opening could be obstructed by slag clogging in the supply opening.
  • a collar is provided at or near the second open end of the housing. This collar forms another obstruction for casting powder or entrained by gas escaping through the housing and further diminish the amount of casting powder that is lost in the factory building or in the exhaust system.
  • At least part of the collar is inside the second part of the housing and the outer rim of the collar is overlapped by the second part of the housing seen from the second open end of the housing in the direction to the first open end of the housing.
  • At least part of the collar and the second part of the housing slope downwards seen in radial outward direction with the supply nozzle in use. By sloping in the same direction a path of a certain dimension is created between the collar and the second part of the housing.
  • the length of the path that gasses escaping from the housing have to follow will be longest if the beginning of the collar against the inlet or outlet member starts at about the same height as the second open end, that is the open end of the second part of the housing.
  • an inward projecting edge is provided at the inside of the housing, the edge sloping downwards seen in radial outward direction with the supply nozzle in use.
  • the projecting edge provides that the path the gas escaping through the supply nozzle has to follow to leave the housing gets further complicated by means of which the loss of casting powder is even further reduced.
  • Such a projecting edge can be applied in both small and large housings that is respectively a housing for a supply nozzle with a single outlet member and a housing for a supply nozzle with multiple outlet members.
  • Such a projecting edge is preferably not continuous along the inner circumference of the housing since otherwise powder would get entrapped between the projecting edge and the housing.
  • the inward projecting edge slopes downwards seen in radial outward direction with the supply nozzle in use. With this sloping direction the projecting edge slopes in the same direction as the collar and the sloping face or sloping faces of the tapered second part of the housing. With the same direction is meant that with the supply nozzle in use these faces all slope downwards and may even run parallel or about parallel to each other.
  • the collar overlaps the innermost rim of the inward projecting edge seen from the second open end of the housing in the direction of the first open end of the housing.
  • the invention also provides an apparatus for feeding casting powder to a mould for continuous casting comprising a supply container with casting powder, at least one supply duct connecting the supply container with casting powder to at least one supply nozzle wherein the at least one supply nozzle is a supply nozzle according to the invention.
  • Such an apparatus further comprising, if necessary, means to transport casting powder through the supply duct to the at least one nozzle.
  • fig.1 shows a side view of a section of a supply nozzle with two outlet members
  • fig.2 shows a side view of a section transverse to the section according to fig.1
  • fig.3 shows a bottom view of the supply nozzle according to fig.1.
  • a supply nozzle 1 is shown with an inlet 2 and two outlet members 3,4.
  • Supply nozzle 1 is provided with a housing 5 which is fixed to the housing by means of a number of fixing plates 6 which run from the housing to the separate outlet members 3,4.
  • These fixing plates 6, four plates for each outlet member 3,4, run in radial direction to the corners of the housing and to about the middle of the longest sides of the housing.
  • another number of fixing plates could have been taken, for example two or three for each outlet member 3,4.
  • Inlet 2 consist of an inlet part 21 with inlet openings 22 at the free end of inlet part 21 and inlet opening 23 where inlet part 21 connects to the housing of the supply nozzle.
  • the inlet part 21 allows to connect the supply nozzle to a supply duct through which the casting powder is fed to the supply nozzle.
  • the inlet part 21 can also serve as a means to attach the supply nozzle and/or the supply duct to a fixed support by means of which the support nozzle is kept at a fixed position with respect to the continuous casting mould to which the casting powder is to be supplied.
  • the inlet 2 divides into two outlet members 3,4, that each comprise a tubular section 8 at an angle to inlet part 21 and a following tubular section 9 which in this example is parallel to inlet part 21.
  • the tubular sections are box sections in the example shown in the drawing but instead also tubes with a circular cross-section could have been taken.
  • the outlet members 3,4 are provided with an end plate 10 at the outer end of tubular sections 9.
  • the end plates 10 have a larger surface area than the cross-sectional surface area of the tubular sections 9, that is without taking the surface area of supply opening 1 1, see fig.3, provided in the end plate 10 into consideration. Instead of a rectangular shape these end plates 10 may also have every other shape, for instance a round shape.
  • the size of the supply opening 1 1 is taken such as to be able to fulfil the demand for casting powder and the size of the inlet part 21 and the outlet members 3,4 are taken such that there will always be enough casting powder under all or as good as all conditions.
  • the end plates 10 are at a level above the bottom rim 12 of housing 1 to prevent clogging of supply opening 11 by coming into contact with the slag layer on top of the molten metal in the mould.
  • Housing 5 comprises a first part 13 and a second part 14, wherein the first part 13 has the shape of a rectangular box and the second part the shape of a truncated pyramid.
  • the upper rim 15 of the second part 14 is at the height of the inlet part 21 just above the junction with the sections 8 of the outlet members 3, 4.
  • a collar 16 is provided with a flat portion 17 that is parallel or about parallel to the upper rim 15 of the second part 14 of housing 5, in the figure just below said upper rim 15. This corresponds to the position of flat portion 17 and upper rim 15 during normal use of the supply nozzle.
  • the sloping sides 18 are parallel or about parallel to the sloping sides of the second part 14 of housing 5 and form together a circumferential channel in the housing through which the gas entering the housing from out of the molten metal in the mould can escape.
  • a projecting edge 19 is provided in the housing which preferably consists of one or more parts along one or more of the inner sides or part of one or more inner sides.
  • the edge 19 is provided at the short sides of the housing only and runs parallel or about parallel to the sloping sides 8 of the outlet members 3,4 and extend to the in the figure lower rim 20 of collar 16.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

L'invention concerne une buse d'alimentation pour alimenter un récipient en matériau en poudre ou en granulés, comprenant une entrée pour le matériau en poudre ou en granulés et au moins un élément de sortie relié à l'entrée, ladite entrée et/ou l'élément de sortie étant entourés, sur au moins une partie de sa longueur, d'un logement avec deux extrémités opposées ouvertes. L'entrée est de préférence positionnée dans ou à proximité d'une extrémité d'ouverture et l'élément de sortie étant positionné dans ou à proximité de l'extrémité d'ouverture opposée du logement. Un collier est également disposé dans ou sur l'extrémité d'ouverture où l'entrée est positionnée. Le logement et le collier empêchent la perte de matériau en poudre ou en granulés fourni par entraînement par un gaz s'échappant de la buse d'alimentation dans l'environnement. La buse d'alimentation peut par exemple être utilisée pour fournir une poudre de coulée à un métal fondu ou à un alliage métallique dans un moule à coulée continue.
PCT/EP2012/003230 2011-08-02 2012-07-30 Buse d'alimentation pour matériau en poudre ou en granulés Ceased WO2013017251A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP11006341.9 2011-08-02
EP11006341 2011-08-02

Publications (1)

Publication Number Publication Date
WO2013017251A1 true WO2013017251A1 (fr) 2013-02-07

Family

ID=46724310

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2012/003230 Ceased WO2013017251A1 (fr) 2011-08-02 2012-07-30 Buse d'alimentation pour matériau en poudre ou en granulés

Country Status (1)

Country Link
WO (1) WO2013017251A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2378098A1 (fr) * 1977-01-20 1978-08-18 Akad Gorniczo Hutnicza Procede et dispositif pour l'introduction de reactifs dans du metal liquide
FR2458322A1 (fr) * 1979-06-07 1981-01-02 Clesid Sa Bouche d'epandage de poudre
EP0059411A1 (fr) * 1981-02-26 1982-09-08 Elkem A/S Dispositif pour la distribution de matiére de couverture
US4595045A (en) 1982-03-05 1986-06-17 Societe Lorraine De Laminage Continu-Sollac (Societe Anonyme) Method and device for supplying and controlling the layer of flux powder in a continuous casting mold
JPS62292255A (ja) * 1986-06-12 1987-12-18 Kawasaki Steel Corp 溶融金属注湯用ノズル
WO1992000819A1 (fr) * 1990-07-11 1992-01-23 Intocast Gmbh Feuerfestprodukte Und Giesshilfsmittel Procede et dispositif d'adjonction en continu d'additifs de coulee a la surface d'une masse fondue dans une coquille de coulee continue
BE1004046A3 (fr) * 1989-06-28 1992-09-15 Internat Ind Engineering S A Dispositif de dosage et de transport d'une masse pulverulente.
WO1995015234A1 (fr) * 1993-11-30 1995-06-08 Techmetal Promotion Dispositif d'alimentation pour le depot par simple gravite d'un materiau granuleux sur la surface d'un metal liquide coule en continu
EP2172290A1 (fr) * 2007-07-04 2010-04-07 TECHCOM GmbH Busette immergée

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2378098A1 (fr) * 1977-01-20 1978-08-18 Akad Gorniczo Hutnicza Procede et dispositif pour l'introduction de reactifs dans du metal liquide
FR2458322A1 (fr) * 1979-06-07 1981-01-02 Clesid Sa Bouche d'epandage de poudre
EP0059411A1 (fr) * 1981-02-26 1982-09-08 Elkem A/S Dispositif pour la distribution de matiére de couverture
US4595045A (en) 1982-03-05 1986-06-17 Societe Lorraine De Laminage Continu-Sollac (Societe Anonyme) Method and device for supplying and controlling the layer of flux powder in a continuous casting mold
JPS62292255A (ja) * 1986-06-12 1987-12-18 Kawasaki Steel Corp 溶融金属注湯用ノズル
BE1004046A3 (fr) * 1989-06-28 1992-09-15 Internat Ind Engineering S A Dispositif de dosage et de transport d'une masse pulverulente.
WO1992000819A1 (fr) * 1990-07-11 1992-01-23 Intocast Gmbh Feuerfestprodukte Und Giesshilfsmittel Procede et dispositif d'adjonction en continu d'additifs de coulee a la surface d'une masse fondue dans une coquille de coulee continue
WO1995015234A1 (fr) * 1993-11-30 1995-06-08 Techmetal Promotion Dispositif d'alimentation pour le depot par simple gravite d'un materiau granuleux sur la surface d'un metal liquide coule en continu
EP2172290A1 (fr) * 2007-07-04 2010-04-07 TECHCOM GmbH Busette immergée

Similar Documents

Publication Publication Date Title
US9745653B2 (en) Apparatus for the continuous hot-dip coating of metal strip
ES2228651T3 (es) Dispositivo para el recubrimiento de particulas.
KR102262144B1 (ko) 미립자 재료를 좁은 수직 용기 안으로 장입하기 위한 공정
BRPI0718348B1 (pt) instalação de fundição contínua para escoamento de aço líquido e processo para a fundição contínua de aço em jato oco
RU2450890C2 (ru) Способ и устройство для разливки расплава цветных металлов, в частности меди или медных сплавов
IT201600098452A1 (it) Apparecchiatura per la micronizzazione di materiale polveroso con capacita’ di prevenire incrostazioni
US7063242B2 (en) Refractory pouring spout and channel unit for the arrangement on an outlet of a vessel containing molten metal, especially the tundish of a strip casting installation
UA126023C2 (uk) Протиударне ущільнення
WO2013017251A1 (fr) Buse d'alimentation pour matériau en poudre ou en granulés
US4595045A (en) Method and device for supplying and controlling the layer of flux powder in a continuous casting mold
RS49820B (sr) Postupak i uredjaj za punjenje silosa
JP4920801B2 (ja) フラックス投入装置、連続鋳造設備、フラックス投入方法、及び連続鋳造方法
CN103038001A (zh) 将粉末状物质涂覆在冶金容器中的金属熔液的液面上的方法和设备
JPH06191640A (ja) 低速高濃度輸送装置
JP5106967B2 (ja) 燃焼灰堆積防止装置およびこれを備えたダクト
KR101349917B1 (ko) 침적 개공용 쉬라우드 노즐 및 이를 구비하는 연속 주조 장치
CN203613247U (zh) 一种铜熔炼炉的精矿入料装置
JP2024119445A (ja) 連続鋳造装置
CN101340991B (zh) 进料装置及其用法
KR102598750B1 (ko) 살수 시스템
KR101828690B1 (ko) 냉각수 수절장치
KR100495756B1 (ko) 내화물 조립체, 내화물 조립체 세트, 상기 내화물 조립체 세트를 포함하는 액상 금속 이송용 플랜트 및 상기 액상 금속 이송용 플랜트 내에서의 불활성 기체 공급 조절 방법
CA2473316A1 (fr) Systeme et methode de moulage pour le coulage de masses en fusion de metal non ferreux
JP2024120517A (ja) 連続鋳造装置
KR102209610B1 (ko) 노즐 장치

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12750318

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12750318

Country of ref document: EP

Kind code of ref document: A1