EP0092029A2 - Four à cuve - Google Patents

Four à cuve Download PDF

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Publication number
EP0092029A2
EP0092029A2 EP83101249A EP83101249A EP0092029A2 EP 0092029 A2 EP0092029 A2 EP 0092029A2 EP 83101249 A EP83101249 A EP 83101249A EP 83101249 A EP83101249 A EP 83101249A EP 0092029 A2 EP0092029 A2 EP 0092029A2
Authority
EP
European Patent Office
Prior art keywords
furnace
cupola
head
wind
furnace according
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.)
Granted
Application number
EP83101249A
Other languages
German (de)
English (en)
Other versions
EP0092029B1 (fr
EP0092029A3 (en
Inventor
Hans-Günther Dr. Rachner
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.)
Kuettner GmbH and Co KG
Original Assignee
Kuettner GmbH and Co KG
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 Kuettner GmbH and Co KG filed Critical Kuettner GmbH and Co KG
Priority to AT83101249T priority Critical patent/ATE21543T1/de
Publication of EP0092029A2 publication Critical patent/EP0092029A2/fr
Publication of EP0092029A3 publication Critical patent/EP0092029A3/de
Application granted granted Critical
Publication of EP0092029B1 publication Critical patent/EP0092029B1/fr
Expired legal-status Critical Current

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Classifications

    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/02—Shaft or like vertical or substantially vertical furnaces with two or more shafts or chambers, e.g. multi-storey
    • F27B1/04—Combinations or arrangements of shafts
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/12—Shells or casings; Supports therefor
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • F27B1/12—Shells or casings; Supports therefor
    • F27B1/14—Arrangements of linings

Definitions

  • the invention relates to a cupola furnace, in particular a hot-wind cupola furnace with long-term feed, with a discharge device arranged below the charging opening for extracting the blast furnace gases and a wind device arranged below the blast furnace gas discharge device for feeding, distributing and introducing the wind into the furnace.
  • the cupola furnace which has long been known in its basic structure, is known to be the most common melting unit for the production of cast iron, malleable iron, etc. in foundries.
  • Cupola furnace the wind of which is warmed before being introduced into the furnace.
  • the classic cold wind cupola essentially consists of a cylindrical sheet metal jacket which is lined on the inside with a refractory acidic lining, the wind nozzles which form the wind device and which are distributed over the circumference, together with an annular wind jacket, are molded into the refractory lining. Since the feed burn-out in the melting zone is so high that a daily relining of the furnace is necessary, two furnace shafts are usually installed next to each other, one of which is in operation while the other is repairing, i.e. is delivered with new feed.
  • Cupola furnaces of this type with acidic lining, wind nozzles molded into the refractory delivery, and furnace shafts arranged in pairs due to the daily relining required are also in operation as hot-wind cupola furnaces, although hot-wind cupola furnaces have been built predominantly without feed with a water-cooled furnace shaft and with water-cooled wind nozzles at a Such a design, repair work on the stove is only necessary at intervals of a few weeks and can then be carried out at the weekend, so that such melting plants are operated only with one furnace shaft.
  • These hot-wind cupola ovens with a feedless furnace shaft which have mainly been in use since 1960, have also found widespread use because they prevent the feed from being re-fed daily.
  • shut-off devices are therefore generally designed as gas-tight slides, which require considerable effort, since on the one hand they are constantly exposed to dust-containing gas and on the other hand they are exposed to temperatures of 1200 ° C when the furnace burns down, but they are always safe for a gas-tight one Should provide closure.
  • the top gas extraction device is in such systems arranged below the inspection opening and consists essentially of an annular chamber from which the blast furnace gas line leads to the combustion chamber.
  • the column of material standing above the blast furnace gas extraction device results in a pressure drop for the unavoidable quantity of false air, which can possibly be used for the construction of a control circuit, with the negative air quantity in a range of approximately 2 to 10 at a vacuum of 1 to 2 mm WS % of the amount of blast furnace gas can be set.
  • lined cupola furnaces with water-cooled wind nozzles and water-cooled furnace jacket have also become known, initially as cold cupola furnaces and later, after the first energy crisis, as larger hot-wind cupola furnaces, which do not require repair work for at least a week can be operated on feed and are therefore referred to as ovens with "long-term feed”. They are carried out with an oven shaft, with the relining taking place on a weekend.
  • the object of the present invention is to considerably simplify and thus improve the cupola furnace of the type described in the introduction, in particular with regard to the gas system, in particular the expensive shut-off devices of the blast furnace gas extraction devices which were previously required for operational and safety reasons and the cupola furnace with regard to the energy balance, in particular for a hot wind operation and a design with long - term feed should.
  • the limited lifespan of the kiln feed should be usable up to the last day and nevertheless practically continuous kiln operation should be possible.
  • the accessibility to the interior of a new furnace to be relocated is to be improved and the overall effort to be reduced.
  • the invention provides that the furnace between the blast furnace gas extraction device and the wind device has a separating joint provided with a seal, that the furnace head located above the separating joint can be uncoupled from the lower furnace located below the separating joint, and that a second lower furnace is present which is interchangeable with the first sub-furnace and can be coupled to the furnace head.
  • the configuration according to the invention can advantageously be used both in cold-wind cupola furnaces and in hot-wind cupola furnaces as well as in hot-wind cupola furnaces with long-term feed, the latter having a particularly advantageous application if there is a desire for the life of the feed to exploit until the last day and then repair work on the feed during normal working hours (and not on the coming weekend), with the sub-furnace being replaced at the end of the shift in about half an hour and the relining of this sub-furnace after cooling can then be carried out on the following working day, while the system is being used on the second To continue operating the furnace.
  • the furnace head can preferably be lifted out of its working position in contact with the sub-furnace, specifically with regard to the blast furnace gas line connected to the furnace head, preferably pivotable about a pivot axis running at a distance from the furnace axis, which, according to a preferred embodiment of the present invention, runs horizontally and can lie in a joint, which is preferably located on the end section of the blast furnace gas line facing away from the furnace and is connected there to a stationary component.
  • This stationary component is preferably the inlet connection of a combustion chamber arranged downstream of the blast furnace gas line.
  • the seal arranged in the parting line between the furnace head and the lower furnace is preferably designed as a soft seal, which in the operating state is acted upon by the weight of the furnace head, so that the required tightness can be achieved in this way.
  • a centering device may be provided for centering the furnace head relative to the lower furnace, the Centering device can be realized according to a preferred embodiment by a correspondingly adjustable joint, which enables a message in the longitudinal direction of the blast furnace gas line, while alignment transverse to the longitudinal direction of the blast furnace gas line can be carried out by a corresponding method of the sub-furnace.
  • Fig. 1 shows a perspective view of a cupola furnace, generally designated 1, which is designed and operated as a hot-wind cupola furnace with long-term feed.
  • the cupola 1 has one at the top of one Inspection shaft 2 existing inspection opening 3.
  • a blast furnace gas extraction device designated as a whole, which essentially consists of an annular chamber 6 and a blast furnace gas line 7 connected to it.
  • the cupola furnace 1 is provided between the blast furnace gas extraction device 4 and the wind device 9 with a separating joint 14 having a soft seal 13, the part lying above the separating joint 14 being a part of the furnace head identified overall by 16 and below the separating joint 14 a first lower furnace 17 forms, which can be uncoupled from the furnace head 16.
  • a second sub-oven 18 arranged laterally next to it, which can be exchanged for the first sub-oven 17 and coupled to the oven head 16, as will be described further below is.
  • the furnace head 16 has two wind line sections 19, each of which also has a separation line 21 in the plane of the joint 14 of the furnace shaft 8 and is connected there to lower wind line sections 19 ′ which lead to the wind jacket 11.
  • the entire furnace head 16 forming an upper furnace rests with its own weight on the soft seal 13 and in this way ensures a good seal.
  • the top of the top gas line 7 leads away from the furnace 1 to a combustion chamber 22 and is connected at this end in an articulated manner to an inlet connection 23 of the combustion chamber 22, as can be seen in particular from FIG. 3.
  • this end section of the blast furnace gas line 7 has laterally arranged pivot pins 24, which are mounted in webs 26, which extend parallel to the longitudinal axis 27 of the blast furnace gas line 7 and are fastened to a flange 28 of the inlet connector 23.
  • An annular seal 20 is arranged between the inside of the inlet connection 23 and the outside of the blast furnace gas line 7.
  • the diameter of the passage opening 31 in the wall 32 of the combustion chamber 22 is larger than the outside diameter of the blast furnace gas line 7, so that it can be pivoted in the direction of arrow 33 to a limited extent about the pivot pin 24 forming a horizontal pivot axis.
  • the shaft located above the parting line 14 is double-walled and can be cooled with water in its cavity.
  • the cupola furnace 1 in operation which is shown in the middle part in FIG. 1, has at its lower end a chassis 38, which is not shown in detail in detail, by means of which it is mounted on rails 39 of a frame 40 in the direction of Double arrow 42 can be moved laterally.
  • the hydraulic cylinders 37 are actuated after the furnace has burned down completely, which moves the entire furnace head 16 around the Move height H upwards, namely by means of a pivoting movement about the pivot axis formed by the pivot pin 24, the brackets or the like which may be present beforehand, of course. be released at the parting line 14 and / or the parting lines 21 and the screw connection 43 of the water line 44 is also opened.
  • the first lower furnace 17 is free from the upper furnace 16 and can be moved to the right in the direction of arrow 42 by means of the drive 38 of its carriage 38, not shown, so that it assumes a position in the right part, which corresponds in mirror image to the position of the second sub-furnace 18 shown in FIG. 1.
  • the second sub-furnace 18 is simultaneously moved under the furnace head 16 which is still raised. If the undercarriages 38 and 38 'of the two sub-furnaces 17 and 18 are separate, this can be done The newly delivered sub-oven 18 is moved in a separate work step.
  • the second sub-furnace 18 can be positioned relative to the furnace head 16 on the one hand by means of its chassis 38 '.
  • adjusting means (not shown in detail) are provided on the joint designated as 46 between the top gas line 7 and the inlet connection 23 of the combustion chamber 22.
  • the hydraulic cylinders 37 are slowly lowered, so that the lower edge 46 of the furnace head 16 lies on the soft seal 13 and provides the required sealing.
  • the connections between the wind line sections 19 and 19 'and the sections of the water line 44 are established, so that the cupola furnace is then ready for operation again.
  • the sub-oven can be replaced in about half an hour.
  • the sub-furnace 17 moved from its operating position into a waiting position can then cool down overnight and be reloaded on the following working day. It can easily be seen that the accessibility to the interior of a sub-oven 17 or 18 to be relocated is extraordinarily good, since the operating personnel are not hindered by the upper oven. Furthermore, it is seen that no risk of accident for the - service personnel is because a accommodated in the waiting position lower furnace is completely separated from the gas system of the cupola. For this reason there is therefore no danger that uncontrolled false air is sucked in from a waiting furnace. Despite these considerable operational advantages, the overall effort to be taken is considerably less than comparable known systems, since the gas system has only a single furnace head and accordingly also on any shut-off devices such as sliders, water cups or the like. can do without.
  • the cupola furnace according to the invention is suitable for all possible designs and operating modes, including with regard to the utilization of waste heat, both so-called wet scrubbers, i.e. So systems that are provided in front of a downstream recuperator with wet dedusting devices, as well as systems with a combustion chamber, recuperator, heat exchanger and subsequent filter can be used in an advantageous manner, in which the initially unpurified blast furnace gases are burned.
  • wet scrubbers i.e. So systems that are provided in front of a downstream recuperator with wet dedusting devices, as well as systems with a combustion chamber, recuperator, heat exchanger and subsequent filter can be used in an advantageous manner, in which the initially unpurified blast furnace gases are burned.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Heat Treatment Of Articles (AREA)
  • Compressor (AREA)
EP83101249A 1982-04-21 1983-02-10 Four à cuve Expired EP0092029B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83101249T ATE21543T1 (de) 1982-04-21 1983-02-10 Kupolofen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823214708 DE3214708A1 (de) 1982-04-21 1982-04-21 Kupolofen
DE3214708 1982-04-21

Publications (3)

Publication Number Publication Date
EP0092029A2 true EP0092029A2 (fr) 1983-10-26
EP0092029A3 EP0092029A3 (en) 1984-04-25
EP0092029B1 EP0092029B1 (fr) 1986-08-20

Family

ID=6161460

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101249A Expired EP0092029B1 (fr) 1982-04-21 1983-02-10 Four à cuve

Country Status (3)

Country Link
EP (1) EP0092029B1 (fr)
AT (1) ATE21543T1 (fr)
DE (1) DE3214708A1 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE420094C (de) * 1924-09-23 1925-10-16 Robert Ardelt Dr Ing Kupolofen mit fahrbarem Unterherd
US1801045A (en) * 1926-07-24 1931-04-14 Centrifix Corp Cupola
US2345502A (en) * 1942-03-13 1944-03-28 Herbert A Reece Cupola apparatus and method of melting metal
DE2815274C3 (de) * 1978-04-08 1981-07-09 Deere & Co. Niederlassung Deere & Co. European Office, 6800 Mannheim, Moline, Ill. Vorrichtung zum Abdichten von Öfen

Also Published As

Publication number Publication date
DE3214708A1 (de) 1983-11-03
DE3214708C2 (fr) 1987-07-02
EP0092029B1 (fr) 1986-08-20
ATE21543T1 (de) 1986-09-15
EP0092029A3 (en) 1984-04-25

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