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WO1991010749A1 - Procede et appareil de rechauffage de ferrailles a haute temperature - Google Patents

Procede et appareil de rechauffage de ferrailles a haute temperature Download PDF

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Publication number
WO1991010749A1
WO1991010749A1 PCT/US1990/007631 US9007631W WO9110749A1 WO 1991010749 A1 WO1991010749 A1 WO 1991010749A1 US 9007631 W US9007631 W US 9007631W WO 9110749 A1 WO9110749 A1 WO 9110749A1
Authority
WO
WIPO (PCT)
Prior art keywords
scrap
preheating
vessel
combination
gates
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/US1990/007631
Other languages
English (en)
Inventor
Vinod Kumar
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1991010749A1 publication Critical patent/WO1991010749A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
    • F27D13/002—Preheating scrap
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/56—Manufacture of steel by other methods
    • C21C5/562—Manufacture of steel by other methods starting from scrap
    • C21C5/565—Preheating of scrap
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • This invention is used for preheating scrap to high temperature before being charged into a melting furnace. Its main application is in mini steel mills which use scrap as the main source of raw material for making steel. It is also used in integrated steel mills where scrap makes up only a part of the charge. Background
  • Steel making processes like electric arc furnaces, basic oxygen furnaces etc. use scrap as raw material for making steel. Depending on the process, scrap may form upto 100% of the charge.
  • the efficiency of the melting process varies between 45 to 60% and roughly 20 to 40% of input energy goes to waste in the form thermal energy of exhaust gases which must be cooled to about 90 to 140 C by a combination of water cooled duct, infusion of cold air, water sprays, air to air coolers or a combination of two or more of these processes before these gases could be admitted to a filter baghouse for cleaning and subsequent discharge to the atmosphere. All these devices mean operating expenses and capital investment to the steel maker without any recovery of the lost energy.
  • the refractory lining cools down to ambient temperature before the scrap bucket is returned to the preheat station. Due to repeated cycles of heating and cooling, the
  • Scrap bucket is a crude fabrication and due to rough handling they receive during loading of scrap with magnets, scrap being dropped in these all the time and frequent lifting by crane, the scrap buckets never retain their shape, and therefore it is impossible to provide a good seal between the bucket and the hood, and between the bucket and the container they are kept during scrap preheating period.
  • the distorsion of these buckets gets worse when these are used for preheating scrap.
  • the biggest casualty on these buckets are clam shells on which the scrap rests during preheating. As the hot gases pass through and around these clam shells during the preheating period, these suffer most damage and need extensive repairs.
  • This invention comprises the following main components:
  • a scrap preheating station consisting of one or more stationary
  • preheating vessels with or without refractory, metallic or other lining, which receive scrap from a scrap bucket and hold it (the scrap) while it is being heated by hot exhaust gases. After the heating cycle is complete, the scrap is discharged into an empty scrap bucket ready to receive the preheated scrap from the preheating vessels.
  • a cover for each vessel which covers the preheating vessel while the scrap is being preheated in it. The cover is also used to convey hot gases to or from the preheating vessel.
  • a set of bottom discharge gates for each preheating vessel which support the scrap during loading and preheating period and open by mechanical or hydraulic devices or a combination thereof to discharge scrap into an empty scrap bucket kept below the preheating vessel.
  • a hot gases supply and return system with at least one set of
  • Figs 1, 2, 3 and 4 show typical cross sections, and Fig 6 a general
  • Fig 5 shows the end view of a typical installation of the invention as further elaborated by description in this application.
  • the scope of the invention is not limited to this layout only.
  • This figure being the end view shows one preheating vessel; the scope of the invention also includes multiple vessels in parallel or in series.
  • This figure shows the vessel is installed in a separate building.
  • the scope of the invention provides that space, physical conditions and clearances permitting, the preheating vessel and apparatus could be installed in an existing melting furnace building also as covered in the text of this application.
  • the scrap preheating vessel 1 in Figs 1,2,3,4 and 6 is a steel fabricated shell with or without refractory, metallic or other lining 2 in Figs 1,2,3 and 4.
  • the preheating vessel is circular in section but could also be elliptical or other shapewithout in any way affecting the intended performance of the invention.
  • the walls of the vessel 1 are preferably conical, with larger diameter on the bottom, as shown in Figs 1,3 and 4, or cylindrical (not shown), or a combination of conical and cylindrical forms as shown in Fig 2.
  • the bottom part of the preheating vessel 1 could also be an inverted cone as shown in Fig 6, should it become necessary to discharge scrap into a smaller scrap bucket - again without affecting the intended performance of the invention.
  • the preheating vessel 1 itself is open at the top as well as at the bottom.
  • the size of the preheating vessel depends on the quantity and quality of the scrap to be preheated in one batch, the size and physical dimensions of the scrap bucket and the melting practice used in the furnace.
  • the preheating vessel 1 is supported by structural beams 3 in Figs 1,2, and 5.
  • the support could be mounted directly on the beams 3 as shown in Fig 1, or on spring pads 4 in Fig 2.
  • the advantage of mounting on the spring pads 4 is that as the scrap expands when it is being heated the vessel will be lifted up thus causing less mechanical damage to the lining 2, if installed, and also less stresses in the preheating vessel shell 1.
  • the support beams 3 could be located near the top of the vessel as shown or anywhere along the height of the vessel to suit the space and design requirements of a particular application.
  • the Vessel Cover The vessel cover 5 in Figs 1,2,3,4,5 and 6 is a steel fabrication with or without a lining 6,
  • the cover is preferably of dome shape but other shapes and forms shall also perform equally well.
  • the gas duct shall be connected to the center of the top of the cover which would result in even and uniform distribution of gases over the surface of the scrap. But, if the building height and the crane approaches so dictate, the duct could be connected to the side of the cover, as shown in Figs 2 and 6.
  • the cover is supported from a self propelled travelling car 7 in Fig 5, which travels on tracks mounted on the support structure 3.
  • the car has cover lifting means 8 in Fig 5, to lift and lower the cover.
  • the direction of movement of the cover 5 is dictated by the physical layout of the installation. In the preferred embodiment, the cover 5 moves perpendicular to the direction of the crane travel in order to keep the building height to a minimum.
  • the cover could be supported from a cantilever beam or a jib crane (not shown) or other devices.
  • a gasket 9 in Figs 1,2,3 and 4, or seal (not shown) is provided between the vessel 1 and the cover 5 in order to prevent leakage of outside air into the preheater.
  • the gasket or seal is not absolutely necessary.
  • Bottom Discharge Gates The basic concept of the design of the bottom discharge gates of this invention is that the hot gases do not pass through the bottom discharge gates or around them. Also the gates are opened or moved out from below the vessel 1 by mechanical or hydraulic devices or a combination thereof. The gates are closed by gravity or electro-mechanical or hydraulic means or a combination thereof.
  • the gates are opened or moved out from under the vessel by electro - mechanical or hydraulic devices or a combination thereof.
  • Fig 1 shows the design of one embodiment of the bottom discharge gates.
  • a pair of swing gates 11 are mounted on fulcrum pins 12 which are mounted on brackets on structural beams. In this particular embodiment, it is quite possible that these brackets could be mounted on the vessel 1 itself .
  • the swing gates 11 are sealed against the bottom flange of the vessel 1 by a gasket seal 10.
  • the gates 11 are swung in position to close and seal the vessel against leakage by moving in a pair of cars 13.
  • the cars 13 are moved out to open the gates 11 and discharge the scrap in the scrap bucket below after it has been preheated.
  • the cars movement is accomplished by a withdrawing device 14 comprising hydraulic cylinder or electro-mechanical device or a combination thereof.
  • the cars 13 are equipped with a set of spring pads 15, which exert continuous pressure on the swing gates 11 to keep them sealed against the bottom flange of the preheating vessel 1.
  • a set of gates sealing hydraulic cylinders (not shown) relieve the spring pressure, so that the cars 13 can be moved out and the gates 11 automatically opened.
  • the gates sealing hydraulic cylinders keep the spring pads 15 depressed, the cars 13 moved in position and then the gates sealing hydraulic cylinders are depressurized to let the spring pads 15 exert pressure on the gates 11 to keep these pressed against the bottom flange of the vessel 1.
  • the pair of the cars 13 are replaced by a set of hydraulic cylinders or electromechanical devices which swing the gates 11 in and out. And by means of
  • Fig 2 shows the design of another embodiment of bottom discharge gates.
  • the bottom discharge gates consist of a pair of travelling cars 16 made of heavy fabricated steel structure. Each car has an upper frame 17, fully detachable from the main frame 16.
  • the upper frame 17 is also made of heavy steel fabrication with top surface with or without cast iron or other heat resistant steel liners and act as the bottom discharge gate.
  • the upper frame 17 is moved up and down in slides in the main frame 16 by a gates sealing device 18, which serves to seal the upper frame 17 against the bottom flange of the vessel 1 through a gasket 10.
  • the gates sealing device 18 consist of either a set of hydraulic cylinders or electro- mechanical drive.
  • the gates sealing device 18 exerts constant pressure against the bottom flange of the vessel 1 in order to provide a good seal and prevent air infiltration.
  • the travelling cars 16 together with the upper frames 17 are moved in and out by a withdrawing device 14 consisting of a set of hydraulic cylinders or electro-mechanical drive or a combination thereof.
  • the upper frames 17 are first lowered by releasing the pressure of the gates sealing device 18. This removes the seal between the bottom flange of vessel 1 and the upper frame 17. Now the withdrawing device 14 is activated to move the travelling car 16 together with the upper frame 17 from under the preheating vessel 1 thus discharging the preheated scrap from the vessel 1 into the scrap bucket below.
  • the travelling car 16 -with the upper frame 17 in the lowered positon is moved under the preheating vessel 1.
  • the vessel sealing device 18 is activated which then lifts the upper frame 17 against the bottom flange of the vessel 1 and seals the preheating vessel.
  • the vessel 1 is then ready to receive the new charge of scrap.
  • the front face of the upper frame is equipped with a seal to prevent air infiltration along the face of the two upper frames.
  • Fig 3 shows the design of another embodiment of bottom discharge gates.
  • the bottom discharge gates consist of a pair of travelling cars 16, of heavy fabricated steel construction, which travel on a track mounted on support frame 20.
  • the cars are moved in and out by a withdrawing device 14 which consists of a set of hydraulic cylinders or electro-mechanical drive or a combination thereof.
  • the outer end of the support frame 20 is hinged while the inner end is moved up and down by a gates sealing device 18 which consists of a set of hydraulic cylinders or electro -mechanical drive or a combination thereof.
  • the top surfaces of the cars are lined with cast iron or other heat resistant steel liners which seal against the bottom flange of the vessel through gasket 10.
  • the pair of cars 16 act as the bottom discharge gates.
  • the support frame 20 When the preheated scrap is to be discharged, the support frame 20 is lowered by releasing the gates sealing device 18. In the lowered position the support frame rests on stops 21. This provides better support and rigidity to the support frame 20 and also the bottom discharge gates. The travelling cars 16 are then moved out by the withdrawing device 14, thus discharging the scrap in the the scrap bucket below.
  • the travelling cars 16 In order to prepare the preheating vessel to receive a new charge of scrap, the travelling cars 16 are first moved in below the preheating vessel 1 by the withdrawing device 14 and then the gates sealing device 18 is raised to push the travelling cars 16 against the preheating vessel 1. The vessel 1 is then ready to receive a new charge of scrap.
  • the gates sealing device 18 maintains continuous pressure on the travelling cars 16 to keep them sealed against the bottom flange of the vessel 1 and thus prevent any infiltration of outside air.
  • Fig 4 shows the design of yet another embodiment of the bottom discharge gates.
  • the bottom discharge gates also consist of a pair of travelling cars 16, Each car 16 has an upper frame 17, which is pivoted on the main frame 16, The pivoting of the upper frame takes care of any misalignment between the bottom flange of the vessel 1 and the surface of the upper frame 17, the car 16 itself or the car travel track 20 and thus results in a more effective seal.
  • the travelling cars 16 themselves together with the upper frames 17 are moved in and out on a support frame 20 by a withdrawing device 14 which consists of a set of hydraulic cylinders or an electro-mechanical drive or a combination thereof.
  • the outer end of the support frame 20 is hinged while the inner end is lifted and lowered by a gates sealing device 18 which consists of a set of hydraulic cylinders or an electro-mechanical drive or a combination thereof. In the lowered position, the frame 20 rests on stops 21 in order to provide more stability and rigidness to the support frame 20 and the travelling cars 16.
  • the seal 10, mentioned above is provided only in the preferred embodiment
  • Fig 6 shows the design of yet another embodiment of bottom discharge gates.
  • the bottom discharge gates also consists of a pair of travelling cars 16, of heavy fabricated steel construction, with or without cast iron or other heat resistant liners.
  • the cars 16, travel on a track mounted on a frame 20.
  • the cars 16 are moved out by a
  • withdrawing device 14 which consists of a set of hydraulic cylinders or other electro-mechanical device or a combination thereof, and a connecting means 20 like chain or wire rope, which passes over a pulley or sheave 23.
  • the cars 16 are moved in by gravity or other means (not shown).
  • the support frame 20 is fixed and, in this embodiment, the cars are raised to seal against the bottom flange of the vessel by a gate sealing device 18 which consists of a set of hydraulic cylinders or electro-mechanical device or a combination thereof.
  • Hot Gas Supply and Duct System To prevent melting of scrap in preheater, the hot gases from melting furnace are cooled to a temperature below the melting temperature of steel before being admitted to the preheating vessel. As experience is gained with the operation of the preheater, hotter gases could also be admitted. Necessary dampers in the duct are provided to isolate the preheater for maintenance and during charging and discharging of scrap. An auxiliary burner system can also be installed in vessel cover or in the duct for providing additional energy for preheating the scrap, The gases are conveyed to the scrap preheater either from the duct connected to cover or through the duct connected to the bottom part of the vessel.
  • the preferred method will be to supply the hot gases through the duct connected to the center of the cover, as shown in Figs 1,3,4and 5.
  • This arrangement in combination with outlet duct design covered in this invention results in even distribution of gases in the preheater. This also yields more uniform and predictable scrap temperatures.
  • the duct can also be connected to top part of the vessel (not shown).
  • the inlet duct shall bewrapped around and the gases admitted evenly along the periphery of the vessel. However this is the last resort as this increases the height of the vessel and the distance the scrap has to be dropped thus causing more impact loading on bottom discharge gates.
  • embodiment is to convey the gases from top to bottom for part of heating cycle and then reverse the direction from bottom to top for the rest of the cycle or vice versa. This results in more uniform and predictable
  • the other duct which as stated earlier can be used either to supply or exhaust gases to or from the vessel is connected near the bottom edge of the vessel.
  • the duct 25 runs around the periphery of the vessel 1 with calculated opening all around so that the gases are distributed evenly around the circumference of the vessel 1.
  • the duct 25 may be lined with refractory 26. The even
  • the duct is mounted independently of the vessel so that any movement of the vessel 1 is not transmitted to the duct 25.
  • a seal 27 is provided as shown.
  • the seal 27 is a flexible, high tempearature resistant fabric.
  • One edge of this seal is bolted to a flange welded to the vessel 1; the other edge could be lying flat on the duct 25 as shown or could be bolted leaving some flexibility to allow relative movement between the duct 25 and the vessel 1. Since the duct is always under suction the seal 27 is always sucked against the duct 25 and thus providing a good seal.
  • the duct 25 is mounted on the vessel 1, seal 27 is not necessary.
  • the duct 25 is mounted directly on the vessel 1 as shown in Fig 4 and 6.
  • the duct 25 could have any cross section, square as shown in Fig 6 or round as shown in Fig 4.
  • the duct 25 is run around and connected by small multiple ducts 24 around the periphery of the preheating vessel so that the gases are supplied or exhausted all around the circumference.
  • the duct could be connected on one side of the vessel, as shown in Fig 3, or the single duct bifurcated and the two branches connected to the vessel diametrically opposite to each other (not shown).
  • This embodiment will, however, not provide even and uniform gas distribution in the vessel and is to be adopted under extenuating circumstances only.
  • the scrap preheater of this invention can be installed in many ways.
  • the main considerations in its installation, as shown in Fig 5, are: a.
  • a scrap bucket 31 on transfer car 32, is able to pass under the vessel 1 and allow the vessel 1 to discharge the load of scrap in it (scrap bucket 31). It should also be possible to pick up the scrap bucket 31 by an overhead crane to be discharged in melting furnace.
  • a crane 36 should be able to discharge a bucket 35 full of scrap in the preheating vessel 1, and c. There should be space around the vessel 1 for the supply and return ducts for the hot gases.
  • the scrap preheater and the associated equipment can not be installed in the existing melt shop, a separate building as close to the existing melt shop as feasible is to be constructed.
  • the two buildings should preferably be connected by a short transfer car track.
  • the cross section of the new building which is also part of the scope of this invention is shown on Fig 5.
  • the new building 33 is of structural fabrication. Building roof and siding are not necessary but are dictated by the local climatic conditions.
  • the installation consists of scrap bucket transfer car track 34 which receives the scrap bucket 35 loaded with scrap from the scrap yard and also lead to the melt shop.
  • the loaded scrap bucket 35 can also be brought to and taken away from building 33 by other means of transportation.
  • the building 33 is to be as narrow as possible; its width is dictated by the size of the preheater vessel to be installed.
  • the building 33 is equipped with a crane or crane trolley 36 to lift the scrap bucket 35 and discharge the scrap into the preheating vessel 1.
  • the building length is determined by the number of preheating vessels to be installed.
  • the scrap is brought in scrap buckets 35 to the preheater installation by any of the available means of transportation.
  • the scrap bucket 35 Is lifted by the existing crane in the existing building or by the crane or crane trolley 36 installed in the new building 33 or by other lifting means.
  • the vessel cover 5 is lifted by cover lifting device 8 and moved away from the top of the vessel 1 by the roof removing mechanism 7.
  • the bottom discharge gates are closed and sealed.
  • the bucket clam shells are then opened and the scrap discharged into the preheating vessel 1.
  • the bucket is then moved away and lowered on to the bucket carrier.
  • the vessel cover 5 is moved over and lowered on to the vessel 1. As soon the vessel 1 is covered, the necessary dampers in hot gas ducts are opened and the flow of gases started.
  • the scrap bucket Since the scrap bucket is not used for heating the scrap and the preheatihg vessel can be lined with refractories or other material, the scrap is heated to much higher temperatures than possible with the existing systems, b. Since the scrap buckets are exposed only to heated scrap (not hot gases) and that too for the short duration of transfer time, there are no adverse effects on the life of the scrap buckets, c. The scrap is heated to temperatures substantially higher than

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)

Abstract

Le procédé et l'appareil décrits servent à réchauffer des ferrailles à une température élevée grâce aux gaz d'émission du four chaud avec ou sans la contribution de brûleurs de combustible additionnels, avant de décharger les ferrailles dans un four de fusion. La station de réchauffage des ferrailles se compose d'un récipient réchauffeur (1) à coque en acier avec ou sans revêtement de garnissage. Le récipient est fermé à son sommet par un couvercle mobile (5) monté de façon indépendante et est fermé dans sa partie inférieure par un groupe de portes de décharge. Les ferrailles froides sont d'abord chargées dans le récipient réchauffeur (1) au moyen d'un godet à ferrailles (35) et, après réchauffage, elles sont déchargées dans un autre godet à ferrailles (31) qui les achemine dans un four de fusion.
PCT/US1990/007631 1990-01-10 1990-12-21 Procede et appareil de rechauffage de ferrailles a haute temperature Ceased WO1991010749A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US46323290A 1990-01-10 1990-01-10
US463,232 1990-01-10

Publications (1)

Publication Number Publication Date
WO1991010749A1 true WO1991010749A1 (fr) 1991-07-25

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Application Number Title Priority Date Filing Date
PCT/US1990/007631 Ceased WO1991010749A1 (fr) 1990-01-10 1990-12-21 Procede et appareil de rechauffage de ferrailles a haute temperature

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2332852A1 (es) * 2008-04-02 2010-02-12 Javier Guiu Lapresta Sistema de control del flujo termico en el horno electrico de arco.
CN107475483A (zh) * 2017-09-21 2017-12-15 洛阳沃达节能科技有限公司 一种移动式废钢在线加热系统
CN112299041A (zh) * 2020-11-13 2021-02-02 河南太行全利重工股份有限公司 一种废钢预热加工用竖井料仓
CN113124687A (zh) * 2021-04-20 2021-07-16 宁夏天净隆鼎碳化硅有限公司 一种碳化硅冶炼炉用粉料出料车

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645516A (en) * 1970-04-20 1972-02-29 Buell Eng Co Method of and apparatus for preheating scrap metal
US3771775A (en) * 1972-07-03 1973-11-13 Steel Corp Refractory-lined container for scrap
US3852028A (en) * 1972-03-28 1974-12-03 Bethlehem Steel Corp Apparatus for preheating scrap
US4666402A (en) * 1985-05-30 1987-05-19 Flakt Ab Method and apparatus for preheating scrap in a bucket

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3645516A (en) * 1970-04-20 1972-02-29 Buell Eng Co Method of and apparatus for preheating scrap metal
US3852028A (en) * 1972-03-28 1974-12-03 Bethlehem Steel Corp Apparatus for preheating scrap
US3771775A (en) * 1972-07-03 1973-11-13 Steel Corp Refractory-lined container for scrap
US4666402A (en) * 1985-05-30 1987-05-19 Flakt Ab Method and apparatus for preheating scrap in a bucket

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2332852A1 (es) * 2008-04-02 2010-02-12 Javier Guiu Lapresta Sistema de control del flujo termico en el horno electrico de arco.
ES2332852B1 (es) * 2008-04-02 2010-07-16 Javier Guiu Lapresta Sistema de control del flujo termico en horno electrico de arco.
CN107475483A (zh) * 2017-09-21 2017-12-15 洛阳沃达节能科技有限公司 一种移动式废钢在线加热系统
CN107475483B (zh) * 2017-09-21 2022-09-06 洛阳沃达节能科技有限公司 一种移动式废钢在线加热系统
CN112299041A (zh) * 2020-11-13 2021-02-02 河南太行全利重工股份有限公司 一种废钢预热加工用竖井料仓
CN113124687A (zh) * 2021-04-20 2021-07-16 宁夏天净隆鼎碳化硅有限公司 一种碳化硅冶炼炉用粉料出料车

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