Classifications

• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
  • C21D1/62—Quenching devices
  • C21D1/667—Quenching devices for spray quenching
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
  • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
  • C21D9/54—Furnaces for treating strips or wire
  • C21D9/56—Continuous furnaces for strip or wire
  • C21D9/573—Continuous furnaces for strip or wire with cooling

Definitions

• the invention relates to a spray treatment installation more particularly intended for the cooling of metallurgical products successively comprising spraying means and a suction box disposed in front of a moving material such as plate, sheet metal, etc. continuously.
• European patent application H ⁇ 0 117 958 describes a device intended to collect a powder-laden gas metallic after it has been used to coat a strip provided with a base coating.
• the device comprises a box formed by two symmetrical casings between which the strip to be covered circulates.
• the box is divided lengthwise into three compartments, the first and last compartment comprising means for blowing the powder-laden gas and the central compartment having return slots for collecting the gas loaded with residual metal powder.
• the central compartment is connected to the intake of a fan and the charged gas is sent to a metering device which restores the powder content before it returns to the gas blowing means. Aerodynamic seals are provided at the ends of the box to prevent the blown gas charged with metal powder from escaping outside the device.
• This device is very suitable for gases conveying powders . dry but the problems to be solved are very different if it is desired, for example, to collect a sprayed liquid as in the case of a heat treatment installation comprising ramps of jets of sprayed water intended to cool a material at high temperatures defying them. Indeed in the case of the film boiling regime (non-wetting regime) intervening for example for steel sheets for wall temperatures higher than about 400 ° C. to 500 ° C., the droplets of water will fractionate on contact with the wall to be cooled with very little evaporation and re-leave.
• the object of the invention is to provide an installation for treating by spraying a liquid, intended for the cooling of a metallurgical product continuously scrolling and for the evacuation of the water sprayed by the organization of the gas flows. conveying the droplets so as to avoid dissymmetrical cooling of the treated surface.
• the invention can in particular be used for the formation of a moderate cooling zone as provided for in French patent application N ⁇ 84 15458 of October 9, 1984 filed by the applicant.
• the treatment installation according to the invention is remarkable in that it comprises in front of the upper face of the material and at least at the inlet and at the outlet a suction box, a spraying boom being arranged between two boxes. neighboring aspiration.
• the distances between the spray bars and the face to be cooled on the one hand and the distances between two consecutive spray bars on the other hand are defined so as to organize the flow of air from the sprayer and the secondary air penetrating between box and sprayer and accompanying the jet, this organization having the effect of allowing to transport and evacuate the droplets flowing from the hot surface.
• the distance between consecutive spraying booms will be sufficient so that there is not appreciably no direct interaction between the jets of successive sprayers and that it is, moreover, possible to constitute and separate flow zones directed towards the product to be cooled and flow zones deviating from the product
• the suction boxes arranged between the spraying booms and also at the two ends of the machine are located directly above the ren ⁇ against zone between the gas and droplet flows coming from two sucking booms ⁇ incessant; they have skirts provided on the edges of the suction opening confining the zone of spouting of the flows and of the droplets.
• FIG. 1 shows schematically: ⁇ ent in perspective and partially broken away an example of a treatment installation according to the invention.
• FIG. 1 is a perspective view of a suction box.
• FIG. 3 is a cross-sectional view of the box according to FIG. 2.
• the installation according to the invention is intended for cooling a metallurgical product moving horizontally after, for example, its exit from a treatment furnace or from a rolling mill "
• a roller conveyor 1 horizontal, supports and drives a sheet 2 in a spray treatment installation made up according to the example shown, of four suction boxes 3, 4, 5, 6 arranged in a trans-
• the ram ⁇ pes consist of jet sprayers in bi-menional ply such as those described, for example, in the
• the suction boxes are arranged between the sprayers above the zone in which the air and droplet flows emerge, the zone being confined by skirts worn by the open-
• FIG. 2 ⁇ An embodiment of the suction boxes is shown in FIG. 2 ⁇
• a box is formed from a metal frame, of approximately parallelepiped shape, closed on three of its longitudinal sides by a formwork ensuring sealing. The ends of the box are closed by plates 11 carrying a central hatch 12 giving access to the drop separator.
• the profiles constituting the upper part of the chassis extend outside the formwork to secure the box on the main frame of the installation.
• the upper wall 13 of the formwork carries, according to the embodiment, two circular passages 14, 15 on which are fixed cylindrical housings 16, 17 connected to the suction of fans (not shown).
• the box has at its lower part, approximately in the extension of its side faces 18, 19, mobile skirts 20, 21 which confine and isolate the rejail ⁇ smoothing area avoid, in case of deformation of the sheet to be treated, deterioration of the boxes and allowing the passage of the deformed sheet.
• This arrangement allows the upper sprayers to be placed at a sufficient distance fisante of the pass line (for example 0.7m) to allow the passage of deformed sheets without deterioration of the machine.
• the box leaves at its lower part a longitudinal opening 22 of relatively large width, limited on one side by a gutter 23 and on the other by a separation 24 which forms, with an upper wall 25 and a face of a drop separator 26, a chamber in which is drawn the air-droplet mixture flowing between the skirts 20, 21.
• a certain part of the droplets are deposited on the walls and fall back into the gutter while the other part passes through the separator plates 26 where the droplets are retained and flow in the lower part between the partition 24 and the wall 19 forming a gutter 27.
• Boxes 28, 29 provided at the ends of the box receive the water recovered by the gutters which is led by pipes (not shown) - to an evacuation - or to a recycling facility.
• the number of elements of the installation depends on the length of the product to be treated but also on the desired cooling capacity.
• the drop separators 26 can, as a variant, be arranged outside the suction boxes. In this case, several boxes can be connected to a single box carrying the separators 26 and the suction fans.

Landscapes

• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Thermal Sciences (AREA)
• Crystallography & Structural Chemistry (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Physics & Mathematics (AREA)
• Heat Treatments In General, Especially Conveying And Cooling (AREA)
• Treatment Of Fiber Materials (AREA)
• Fertilizers (AREA)
• Catching Or Destruction (AREA)
• Absorbent Articles And Supports Therefor (AREA)
• Road Signs Or Road Markings (AREA)
• Valve-Gear Or Valve Arrangements (AREA)
• Sampling And Sample Adjustment (AREA)
• Details Of Measuring And Other Instruments (AREA)
• Transplanting Machines (AREA)
• Dry Formation Of Fiberboard And The Like (AREA)
• Separation Of Suspended Particles By Flocculating Agents (AREA)
• Coating By Spraying Or Casting (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=9316916

Family Applications (1)

Country Status (12)

Families Citing this family (15)

Family Cites Families (8)

• 1985
  • 1985-03-06 FR FR8503281A patent/FR2578553B1/fr not_active Expired
  • 1985-03-27 IN IN264/DEL/85A patent/IN163108B/en unknown
• 1986
  • 1986-02-21 WO PCT/FR1986/000053 patent/WO1986005210A1/fr active IP Right Grant
  • 1986-02-21 AU AU55169/86A patent/AU582976B2/en not_active Ceased
  • 1986-02-21 KR KR1019860700755A patent/KR900004651B1/ko not_active IP Right Cessation
  • 1986-02-21 DE DE8686901411T patent/DE3663685D1/de not_active Expired
  • 1986-02-21 EP EP86901411A patent/EP0215830B1/de not_active Expired
  • 1986-02-21 AT AT86901411T patent/ATE43644T1/de not_active IP Right Cessation
  • 1986-02-21 JP JP61501221A patent/JPS62500182A/ja active Granted
  • 1986-03-05 US US06/836,481 patent/US4711431A/en not_active Expired - Lifetime
  • 1986-11-04 FI FI864482A patent/FI81121C/fi not_active IP Right Cessation
  • 1986-11-06 NO NO864422A patent/NO864422L/no unknown

Non-Patent Citations (1)

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