US3473795A - Industrial furnace built of radiating elements - Google Patents

Industrial furnace built of radiating elements Download PDF

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Publication number
US3473795A
US3473795A US686139A US68613967A US3473795A US 3473795 A US3473795 A US 3473795A US 686139 A US686139 A US 686139A US 68613967 A US68613967 A US 68613967A US 3473795 A US3473795 A US 3473795A
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US
United States
Prior art keywords
furnace
radiating elements
radiating
elements
heat
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
US686139A
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English (en)
Inventor
Attila Biro
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.)
Koho es Gepipari Miniszterium
Koho Es Gepipari Minist Tuzelestechnikai Kutatointezet
Original Assignee
Koho es Gepipari Miniszterium
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 Koho es Gepipari Miniszterium filed Critical Koho es Gepipari Miniszterium
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Publication of US3473795A publication Critical patent/US3473795A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0033—Heating elements or systems using burners
    • F27D99/0035—Heating indirectly through a radiant surface
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/126—Radiant burners cooperating with refractory wall surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B17/00—Furnaces of a kind not covered by any of groups F27B1/00 - F27B15/00
    • F27B17/0016—Chamber type furnaces
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D2001/0046—Means to facilitate repair or replacement or prevent quick wearing
    • F27D2001/0053—Furnace constructed in modules

Definitions

  • the furnace consists of a plurality of prefabricated, removable radiating elements and a framework.
  • the radiating elements are provided on their inner side turned towards the hearth with a firing space built behind the radiating wall, and their outer side opposite to the hearth is provided with heat insulation reducing the heat loss.
  • the elements are also provided with means serving to introduce the fuel and the fire-feeding air into the said firing space and with means to exhaust the combustion products.
  • the radiating elements are fastened to one another and to the said framework by releasable coupling-elements.
  • the invention relates to a heat-treating furnace built of radiating elements for carrying out various metaltechnologic operations.
  • the metal objects to be heated are put into the furnace hearth limited by a refractory wall into which flue gases produced by the firing of a gaseous, a liquid or a solid fuel are introduced.
  • the heat-treating furnaces of this type have the drawback of detrimental deformations appearing on the surface of the material to be heat-treated, due to the contact with flue gases.
  • the dimensions of the hearth of this furnace type cannot be altered after construction.
  • the invention aims at bringing about a heat-treating furnace wherein the deficiencies of the known furnace types are eliminated, the operation being inexpensive, the material to be heated not being in contact with the flue gases during the heat-treating process, the heat transfer being uniform at various points in the furnace hearth, the furnace being assemblable of prefabricated elements in a quick and simple way, the shape of the furnace hearth being alternable in a quick way and by simple means.
  • the task aimed at is solved by the invention by means of special radiating elements.
  • these elements there is a chamber suitable for receiving the flue gases and for carrying out the combustion process.
  • the combustion chamber is bordered by a thin metallic wall, a so-called radiating wall towards the furnace hearth.
  • Coupling elements link the individual elements with one another and with the framework of the furnace on four sides of the elements.
  • each radiating element is provided on its inner side lying towards the furnace hearth with a firing space built behind the radiating wall, whereas on its outer side opposite to the furnace hearth it has heat insulation in order to reduced its heat losses; each radiating element is fitted also with means to introduce the fuel and the firefeeding air into the firing space, and to exhaust the combustion products.
  • the invention has the advantage of the furnace being quickly installable and entirely gas-tight, whereas the workpiece is heated uniformly by the radiation of the Whole wall surface.
  • Another advantage lies in that the elements of the furnacesimilarl to the construction setscan be made any shape or size, and that the radiating elements of standard size are replaceable by elements of the same size, connected in a simple and similar way to the frame work of the furnace and to the other radiating elements. So, for instance, a mixing fan, or simply nothing but an insulating element made of refractory material can be inserted in the place of the radiating elements.
  • FIGURE 1 shows the schematic side elevation of the furnace by way of example, Whilst FIG- URE 2 represents the schematic section of one of the radiating elements.
  • radiating elements 3 bordering and encircling the furnace chamber are fixed by clamps 2. Heating of the radiating elements 3 is effected through a fuel conduit 4.
  • the fuel comes from the fuel conduit 4 into firing devices 5, the amount thereof being regulable by means of cocks 6 built into the conduit.
  • combustion products are generated and flow through connecting branches 7 of the radiating element into a smoke collecting conduit 8.
  • Introduction of the material to be heat-treated into the furnace chamber and its removal therefrom are effected through a furnace door 9 of the usual design, disposed against the head wall of the furnace.
  • the fuel comes from generator space 12 into firing space 11 of the radiating element shown in FIGURE 1.
  • any known type of burning device can expediently be used that gives a flame preferably perpendicular to its own longitudinal axis.
  • the fuel flows through a tube 13 into the generator space 12, whereas the fire-feeding air is conducted through a preheating space 14 and through a tube 15 to the flame.
  • the flue gas produced in the firing space 11 transmits a great part of its heat content to the radiating wall 16 and flows out through a tube end 7 into a smoke collecting conduit.
  • the radiating element 3 is provided with a screening plate 18 and with an insulating board 19 filled with insulating material.
  • the air space arranged on both sides of the screening plate 18 serves equally the purpose of heat insulation. That surface of the radiating elements 3 which lies towards the outer side of the furnace is covered with a corrugated aluminum sheet 17 serving equally to reduce the radiation heat loss.
  • the radiating elements 3 can be airtightly interconnected by any known method, e.g. by means of welding together fastening elements 20 fixed to the body of the element.
  • radiating elements of abt. 1 sq. m. radiating surface are the most expedient, but, in a given case, the size of the elements may be altered or possibly standardized in several sizes.
  • the invention is adaptable with excellent results for carrying out the most various metal-technologic operations: annealing, drying, tempering, hardening, casehardening, nitriding, and for combinations of the above operations.
  • An industrial furnace for carrying out operations on metal workpieces being an assembly of a plurality of removable radiating elements, a framework on which said elements are supported, releasable coupling elements by which the radiating elements are connected to each other and to said framework, said radiating elements encircling and defining within them a heating chamber, said radiating elements having gas-impermeable radiating walls on their inner side facing the chamber 4 and having heat insulation on their outer side opposite the chamber, said radiating elements each having a firing space between the radiating wall and the insulation. means to introduce fuel and combustion air into said firing space, and means to exhaust combustion products from said firing space.
  • said radiating elements being in the form of modular wall-forming elements from which at least a portion of the walls of the furnace are constructed.
  • each radiating element has at least one flue gas outlet tube to exhaust the combustion products.
  • each radiating element has at least one flue gas outlet tube to exhaust the combustion products, and the Whole equipment is provided with one common smoke-collecting and exhausting conduit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • Tunnel Furnaces (AREA)
  • Gas Burners (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Heat Treatments In General, Especially Conveying And Cooling (AREA)
  • Furnace Details (AREA)
US686139A 1967-01-30 1967-11-28 Industrial furnace built of radiating elements Expired - Lifetime US3473795A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HUBI000270 1967-01-30

Publications (1)

Publication Number Publication Date
US3473795A true US3473795A (en) 1969-10-21

Family

ID=10993622

Family Applications (1)

Application Number Title Priority Date Filing Date
US686139A Expired - Lifetime US3473795A (en) 1967-01-30 1967-11-28 Industrial furnace built of radiating elements

Country Status (5)

Country Link
US (1) US3473795A (de)
AT (1) AT284898B (de)
CS (1) CS164250B2 (de)
DE (1) DE1583384C2 (de)
GB (1) GB1226109A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516935A (en) * 1982-07-23 1985-05-14 Gerhard Sanders Arrangement for heating and/or heat retaining of containers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494530A (en) * 1946-03-16 1950-01-10 Malcolm H Tuttle Gas-fired muffle furnace
US2960980A (en) * 1955-12-14 1960-11-22 Selas Corp Of America Stove burner
US3020032A (en) * 1959-04-06 1962-02-06 Selas Corp Of America Vacuum furnace
US3368802A (en) * 1965-06-11 1968-02-13 Alco Standard Corp Construction of insulated furnace wall

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494530A (en) * 1946-03-16 1950-01-10 Malcolm H Tuttle Gas-fired muffle furnace
US2960980A (en) * 1955-12-14 1960-11-22 Selas Corp Of America Stove burner
US3020032A (en) * 1959-04-06 1962-02-06 Selas Corp Of America Vacuum furnace
US3368802A (en) * 1965-06-11 1968-02-13 Alco Standard Corp Construction of insulated furnace wall

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4516935A (en) * 1982-07-23 1985-05-14 Gerhard Sanders Arrangement for heating and/or heat retaining of containers

Also Published As

Publication number Publication date
DE1583384C2 (de) 1973-11-15
DE1583384B1 (de) 1973-04-26
GB1226109A (de) 1971-03-24
AT284898B (de) 1970-10-12
CS164250B2 (de) 1975-11-07

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