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WO1991008273A1 - Joint de porte de four - Google Patents

Joint de porte de four Download PDF

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Publication number
WO1991008273A1
WO1991008273A1 PCT/US1990/006915 US9006915W WO9108273A1 WO 1991008273 A1 WO1991008273 A1 WO 1991008273A1 US 9006915 W US9006915 W US 9006915W WO 9108273 A1 WO9108273 A1 WO 9108273A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade element
scraper
door
sealing
planar end
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/US1990/006915
Other languages
English (en)
Inventor
Robert Walter Highley
Stephen Joseph Stanczak
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 WO1991008273A1 publication Critical patent/WO1991008273A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B25/00—Doors or closures for coke ovens
    • C10B25/02—Doors; Door frames
    • C10B25/16—Sealing; Means for sealing

Definitions

  • the present invention relates generally to oven doors and sealing means for oven doors and more particularly to coke oven doors and coke oven door seals which automatically seal a coke oven so that noxious gases do not escape into the surrounding atmosphere during a cokeing process.
  • a further important reason for providing a coke oven door seal capable of significantly reducing or preventing coke oven gases escaping into the atmosphere is the harmful effect the gases have on the environrnent and the gases are carcinogenic.
  • the United States Environmental Protection Agency has issued regulations limiting the amount of coke oven gases which may be lawfully emitted and heavy penalties are levied for violations.
  • the coke oven door seals presently used on the Koppers coke oven doors and other Koppers-type coke oven doors, such as the improved coke oven doors of United States Patent No. 4,574,035, have self-sealing means in the form of a peripheral continuous sealing ring detachably mounted on the inner planar surface of the oven door designed to make a resilient metal-to -metal sealing contact between the door and a planar contact surface on the oven door frame (i.e. jamb) .
  • the unitary continuous sealing ring presently used on a Kbppers-type coke oven door is formed entirely of a uniform strip of resilient mild steel or 304 stainless steel with the seal having a cross-section generally referred to as S-shaped and having an outer end flange or sealing edge extending perpendicularly toward the oven jamb for making a sealing metal- to-metal contact with the jamb.
  • a Koppers-type door has at spaced points along the entire periphery a plurality of adjustable spring-loaded plungers are provided which press against the back of the S-shaped sealilng ring to force the sealing edge of the ring into a sealing engagement with the jamb.
  • the S-shaped sealing ring in combination with the spring-loaded plungers are able to effectively seal the coke oven against gas leakage, at least for a limited time, but only under conditions where there are initially only relatively small gaps or no gaps between the sealing edge and the oven jamb.
  • a Koppers-type coke oven door having an S-shpaed sealing ring has difficulty sealably closing relatively large gaps between the oven and the jamb, particularly where the gap is due to the jamb being bowed away from the door.
  • the S-shaped ring with its sealing edge extending perpendicularly toward the jamb behaves like a relatively stiff inflexible colmn which resists bending in the plane of the sealing edge where there is an inwardly extending depression in the jamb.
  • Some gaps can be sealably closed by an S-shaped dealing ring only by making time consi-irdng adjustments in the mounting means for the seal, the oven door or the jamb and further adjusting the spaced spring- loaded plungers which bear against the surface of the S-shaped sealing ring. In some instances where excess pressure is applied to the S-shaped sealing ring, permanent distortion of the sealing ring or sealing edge can result.
  • a further deficiency of the S-shaped door seals is the inability of the perpendicular sealing edge to exert any scraping action on the oven jamb to remove objectionable deposits of tar and carbonaceous material on the seal contact surface of the jamb.
  • deposits of tar and hard carboanceous material are formed on the jamb.
  • the deposits of hard carbonaceous material on the jamb can cause large gaps to be formed between the sealing edge and the contact surface which are difficult to remove.
  • the sealing edge of the S-shaped sealing ring is frequently unable to form a sealing engagement with the jamb or the sealing engagement is formed only after exerting excessive pressure on the sealing ring which can result in permanent damage to the sealing ring or sealintg edge.
  • Fig. 1 is a front elevational representation of a Koppers- type coke oven door partilly broken away having a scraper-sealing means of the present invention detachably mounted on the inner surface of the door,
  • Fig. 2 is an enlarged sectional view partially in elevation taken along the line 2-2 of Fig. 1 and showing in phantom the relative position of the scraper-sealing means of Fig. 1 and the oven jamb before and after the oven door is placed in latching engagement with the coke oven,
  • Fig. 3 is a fragmentary enlarged view of a detail of Fig. 1,
  • Fig. 4 is a cross-sectional view of a Koppers-type coke oven door in latching engagement with a coke oven and having the scraper sealing means of Fig. 1 detachably secured to the oven door.
  • Fig. 5 is a fragmentary sectional view partially in elevation of a modified form of a scraper-sealing means of the present invention and showing in phantom the relative postion of the scraper-sealing means and the oven jamb before and after the oven door is placed in latc ⁇ ing engagement with the coke oven.
  • Fig. 6 is a fragmentary sectional view partially in elevation of a further modified form of scraper-sealing means of the present invention and showing in phantom the relative position of the scraper-sealing means and oven jamb before and after the oven door is placed in latching engagement with the coke oven.
  • a self-sealing self-cleaning oven door and door seal embodying the present invention is provided by mounting a scraper- sealing means on a peripheral planar inner surface of a coke oven door having slightly larger dimentions than an oven doorway frame (i.e. jamb) which has a generally planar contact surface facing outwardly from the oven.
  • the scraper-sealing means is constructed of a continuous peripheral spring ring of resilient heat resistant material with interconnected inner and outer planar end sections extending laterally and parallel to the plane of the door and preferably having a generally U-shaped cross-section.
  • the inner planar end section or inner leg of a U-shaped spring ring is adapted to be secured to the inner surface of the oven door adjacent the periphery of the door.
  • the outer planar end section or outer leg of the U-shaped spring ring resiliently supports a free-standing scraper-sealing blade formed of resilient heat resistant material.
  • the scraper-sealing blade extends laterally and forwardly toward the contact surface of the jab and lies in a plane which makes an angle of less than 90 degrees and preferably
  • SUBSTITUTE SHEET about 45 degrees with the plane of the outer leg and the planar contact surface of the jamb.
  • the scraper-sealing blade resiliently engages the contact surface of the jamb with the outer end of the scraper-sealing blade moving laterally over the contact surface of the jamb at an angle less than 90 degrees scraping objectionable amounts of tar and deposits of hard carbonaeous material from an area of the contact surface.
  • the scraping action of the blade forms a smooth contact surface area on the jamb and reduces the number of large gaps between the scraper-sealing blade and the contact surface.
  • the scraper-sealing blade When the scraper-sealing blade moves laterally over the contact surface, tar-containing material piles up in front of the outer end of the scraper-sealing blade and forms a sealing barrier layer along the outer end of the scraper-sealing blade which serves to prevent gases escaping from the oven. While the door is being moved into latching engagement with the oven, the scraper-sealing blade also conforms with distortions in the contact surface by bending laterally along the length thereof (as opposed to bending in the plane of the blade) and closes gaps between the scraper-sealing blade and the contact surface of the jamb so that a sealing engagement is formed.
  • the scraper-sealing blade By having the scraper-sealing blade supported by a resilient U-shaped spring ring, the scraper-sealing blade is protected from being over stressed when force is applied to effect a satisfactory scraping and sealing engagement with the jamb.
  • the U-shaped spring ring is able to conform with distortions in the planar surface of the door when the sealing means is mounted on the door without causing the scraper-sealing blade to assume a form which makes it difficult or impossible for the scraper-sealing blade to sealably conform with distortions in the contact surface of the jamb, particularly when the spring- loaded plungers are used to apply additional pressure on the U- shaped sealing ring.
  • a scraper-sealing means 15 is shown mounted on a rigid generally rectangular pusher side Koppers-type coke oven door 10 typically having dimentions of about 6.7 meters(22 feet) long and 0.64 meters (25 inches) wide so as to overlie the pusher side of a coke oven 11 having a doorway 12 about 6.1 meters (20 feet) high and 0.43 meters (17 inches) wide.
  • the coke oven door 10 can be formed of cast iron but preferably is a warp-resistant fabricated steel structure as shown in United States Patent No. 4,574,035.
  • the doorway 12 is enclosed by a frame (i.e.
  • the contact surface 14 faces outwardly from the oven and lies in a plane parallel to the plane of the peripheral planar inner surface of the door 10 when the door is operatively positioned in the doorway 12 of the oven 11.
  • a plurality of spring boxes 20 with spring-loaded plungers 21 and adjustable means 22 are provided at spaced intervals along the periphery of the door 10.
  • a latching mechanism 24 is provided for applying latching pressure to the door 10 when the door is moved into operative latching engagement with the oven 11.
  • the scraper-sealing means 15 is comprised of a continuous spring ring 25 formed of relatively heavy gauge resilient heat resistant material, such as mild steel or stainless steel, having a generally U-shape cross-section (i.e. a U-shaped spring ring) with parallel inner and outer legs in the form of planar end sections.
  • leg of the U-shaped spring ring are interconnected by resilient section 27 having a length about the same as the leg
  • the legs 26, 28 extend laterally in planes which are parallel to the plane of the door 10 when the inner planar end section (i.e. leg 26) is detachably secured to the door 10.
  • the outer planar end section (i.e. leg 28) has a free-standing scraper-sealing blade element 29 secured to the outer end portion thereof, preferably by welding as at 29a, and at a point spaced inwardly from the outer end of the leg 28.
  • the scraper-sealing blade element 29 extends laterally and forwardldy so that it is able to just engage the contact surface 14 of the jamb 13 before latching pressure is applied to the door 10.
  • the scraper-sealing blade element 29 lies in a plane which makes an interior angle of about 45 degrees with the plane of the leg 28 and with the plane of the contact surface 14 on the outer surface of the jamb 13.
  • the scraper-sealing blade element 29 is formed of a relatively thin gauge material preferably having high heat resistance and high tensil strength, such as a nickel based alloy steel, so as to provide good lateral flexibility (i.e. good lateral bending properties) along with the ability to resist the elevated temperatures to which the blade element 29 is exposed during a coking operation.
  • the outer leg 28 of the U-shaped spring ring 25 extends laterally beyond the point of attachment of the scraper-sealing blade element 29 a distance such that the outer end 23 of each of the plungers 21 can contact the outermost end portion of the leg 28.
  • the outer portion of the leg 28 extending beyond the point of attachment of the blade element 29 functions as a lever arm when the plungers 21 are used to apply pressure on the ring 25 and serves as a leveraged bearing surface for the outer ends 23 of the spring-loaded plungers 21.
  • the plungers 21 are more effective in applying pressure on the blade element 29, and the likelihood of damaging the blade element 29 or the spring ring 25 due to "point loading" is reduced. Also, by having the blade element 29 resiliently supported by the spring ring 25 there is less danger of permanently stressing the scraper-sealing blade element 29, because the spring ring 25 is able to yield and relieve excess pressure which can be applied to the blade element 29 by plungers 21, for example, and by the door latching force when the plungers 21 are not used to form a sealing engagement with the jamb 13.
  • the U-shaped spring ring 25 and the scraper-sealing blade element 29 can both be made of the same resilient heat resistant material, in the preferred enbodiment of the invention when maximum performance and longevity are desired at minimum cost, the U-shaped spring ring 25 and the scraper-sealing blade element 29 are preferably provided with distinctly different properties so that improved scraping and sealing of the coke oven
  • the U-shaped spring ring 25 is preferably formed of relatively heavy gauge inexpensive material having moderate heat resistant properties, such as 0.635 cm (1/4 inch) strip mild steel having a tensil strength of about 248,040 kRa (36,000 pounds per square inch) or 304 stainless steel.
  • the physical properties and gauge of the material used for the spring ring 25 are combined to provide resilient properties which are best suited for transmitting the door latching force to the scraper- esaling blade element 29 without causing damage to the scraper- sealing blade element 29.
  • the scraper-sealing blade element 29 can be made of the same material specified for the U-shaped spring ring 25 where longevity of service is a secondary consideration to cost, but the scraper-sealing blade element 29 is preferably formed of a relatively thin gauge resilient heat resistant material which has a high tensil strength, such as a nickel based alloy steel, for added flexibility (i.e. lateral bending) .
  • the sealing blade element 29 formed of a nickel based alloy steel (or a similar superalloy steel material having properties similar to Inconel X -750) can withstand the flexing stresses of repeated lateral bending and the high temperatures in the immediate area of the jamb, as where a stringer of flames erupts, without being permanently damaged by oxidation.
  • Inconel X-750 (made by Huntington Alloys, -iintington, West Virginia) is readily formable before heat treatment and is aged by a precipitation hardening heat treatment at about 704 degrees C. (1300 degrees F.) for about 20 hours.
  • the aged Inconel X-750 metal has a yield strength at about 427 degrees C. (800 degrees F.) of about 130 ksi and is stable for prolonged periods at about 427 degreees C. (800 degrees F.) .
  • the Inconel X-750 metal welds are fast-annealed by rapidly heating the weld to about 983 degrees C. (1800 degrees F.) for about 15 minutes followed by air cooling.
  • an alloy steel such as Inconel X-750
  • the scraper-sealing means 15 of the present invention can be detachably secured to the inner surface of a Kbppers-type coke oven door 10 in the same space occupied by a Koppers S- shaped sealing ring.
  • the scraper- sealing means 15 is mounted on a plurality of studs 30 held in apertures 31 at spaced intervals adjacent the periphery of the oven door 10. Openings are formed in the inner leg 26 of the U- shaped spring ring 25 corresponding to the spacing of the studs 30.
  • the inner leg 26 is retained on the studs 30 over a gas impervious gasket strip 33 by a steel retaining bar 34 having openings matching those in the leg 26 and by retaining nuts 35 threadably mounted on the outer ends of the studs 30.
  • the scraper-sealing means 15 of Figs. 1-4 when mounted on a Koppers-type coke oven door 10 forms a scraping and sealing engagement with the contact surface 14 of the jamb 13 by having the outer end of the scraper-sealing blade element 29 engage the contact surace 14 as the door 10 is moved into latching engagement with the oven 11.
  • the outer end of the blade element 29 moves laterally over a portion of the contact surface 14 scraping tar and hard carbonaceous material on the contact surface 14 so as to provide an area on the contact surface 14 substantially free of clumps of hard carbonaceous material which otherwise would cause large gaps forming between the blade element 29 and the jamb 13. While the blade element 29 is scraping the contact surface 14, tar and carbonaceous material pile up along the outer end of the blade element 29 and form a barrier layer of tar contair ⁇ ng material which serves to prevent gases escaping from the oven 11.
  • the blade element 29 bends laterally (i.e. perpendicularly to the plane of the blade element 29) to close gaps between the blade element 29 and the jamb 13 and form a sealing engagement with the contact surface 14.
  • the scraper-sealing means 40 is comprised of a cc ⁇ itinuous spring ring 41 having a generally U-shaped cross- section and a generally rectangular configuration.
  • the U-shaped spring ring 41 has inner leg 42 and outer leg 43 which are interconnected by resilient section 44 having about the same length as the legs 42, 43.
  • the legs 42, 43 have a length such that the spring ring 41 can preferably be placed in the space occupied by an S-shaped Koppers sealing ring.
  • the U-shaped spring ring 41 is detachably connected to the door 10 by having the inner leg 42 bolted to the inner surface of the door 10 adjacent the periphery by means of gas impervious fastener means 45.
  • a scraper-sealing blade element 47 is secured, as by welding, to the outer end of the outer leg 43 and extends laterally and forewardly so that the outer end of the blade elemtne 47 just engages the contact surface 14 of the jamb 13 before a lat ing force is applied to the door 10.
  • the scraper- sealing blade element 47 lies in a plane preferably making an angle of about 45 degrees with the plane of the outer leg 43.
  • the outer end of the blade 47 is adapted to form a scraping sealing engagement with the contact surface 14 of the jab 13 as the door 10 with the sealing means 40 mounted thereon is brought into latching engagement with the oven 11.
  • the U-shaped spring ring 41 is formed of any of the resilient heat resistant materials specified for the spring ring element 25 disclosed in connection with Figs. 1-4.
  • the scraper-sealing blade element 47 is formed of any of the resilient heat resistant materials disclosed in connection with the scraper-sealing blade element 29 of Figs. 1-4.
  • the scraper-sealing means 50 is comprised of a continuous spring ring 51 having a generally U-shaped cross-section which conforms to the periphery of the generally rectangular configuration of a Koppers-type coke oven door.
  • the U-shaped spring ring 51 has an inner leg 52 and outer leg 53 which are interconnected by a resilient section 54 having about the length of the inner leg 52.
  • the inner leg 52 is detachably connected to the inner planar surface of a coke oven door 10 adjacent the periphery thereof.
  • the cuter leg 53 has a length somewhat longer than the inner leg 52 and has an end flange or scraper-sealing blade element 55 formed at the outer end thereof which extends laterally and forewardly in a plane preferably making and angle of about 45 degrees with the plane of the inner leg 52 and the inner planar surface of the door 10.
  • the outer edge of the scraper-sealing blade element 55 is adapted to form a scraper sealing engagement with the contact surface 14 of the jamb 13 when the door 10 having the sealing means 50 mounted thereon is brought into latching engagement with the oven 11.
  • the scraper- sealing means 50 is formed of any of the resilient heat resistant materials specified for the spring ring element 25 and scraper- sealing blade element 29 disclosed in connection with Figs. 1-4.
  • the scraper-sealing means of Figs. 5 and 6 function in the same general manner as disclosed for the scraper-sealing means of Figs. 1-4 and are used where plungers 21 are not provided on an oven door or are not required to form a sealing engagement with an oven jamb.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
  • Coke Industry (AREA)

Abstract

Structure de joint de porte d'un four à coke destinée à être fixée sur la surface périphérique interne d'une porte de four à coke (10) et qui selon une réalisation préférée est constituée d'un élément élastique annulaire continu (25) formé d'un matériau résilient résistant à la chaleur de section généralement en forme de U avec des sections d'extrémité interne et externe planes qui se prolongent latéralement vers et parallèlement à la porte du four. L'extrémité de la section plane interne (26) de l'élément élastique annulaire en forme de U est adaptée pour être fixée sur la surface interne de la porte du four adjacent à la périphérie, et la section d'extrémité plane externe (28) de l'élément élastique annulaire en forme de U supporte de façon résiliente une lame d'étanchéité racleuse libre (29) qui se prolonge en avant et latéralement selon un plan formant un angle inférieur à 90 degrés et de préférence environ 45 degrés avec le plan de l'extrémité de section externe. La lame d'étanchéité racleuse (29) entre en contact de façon étanche avec une surface de contact plane (14) d'un montant de four (13) selon un angle inférieur à 90 degrés et de préférence selon un angle d'environ 45 dégrés lorsque la porte du four (10) avec l'élément élastique annulaire fixé à celle-ci est déplacée de manière à provoquer le verrouillage de la porte du four.
PCT/US1990/006915 1989-11-27 1990-11-26 Joint de porte de four Ceased WO1991008273A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US44124189A 1989-11-27 1989-11-27
US441,241 1989-11-27

Publications (1)

Publication Number Publication Date
WO1991008273A1 true WO1991008273A1 (fr) 1991-06-13

Family

ID=23752094

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1990/006915 Ceased WO1991008273A1 (fr) 1989-11-27 1990-11-26 Joint de porte de four

Country Status (2)

Country Link
CA (1) CA2071203A1 (fr)
WO (1) WO1991008273A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12447508B2 (en) 2022-05-06 2025-10-21 Bsh Home Appliances Corporation Home cooking appliance having an integrated door glass surface cleaner for automatic removal of cooking debris

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002537A (en) * 1974-09-30 1977-01-11 Albert Calderon Pollution control of coke ovens
US4118284A (en) * 1977-10-31 1978-10-03 United States Steel Corporation Plug-type coke oven door
US4172769A (en) * 1978-09-27 1979-10-30 Koppers Company, Inc. Coke oven door seal and jamb
US4186055A (en) * 1978-06-26 1980-01-29 Saturn Machine & Welding Co., Inc. Coke oven door
US4425191A (en) * 1979-03-29 1984-01-10 Silicon Technology Incorporated Arrangement for minimizing leakage from heated chambers and method for making same
US4440600A (en) * 1982-09-30 1984-04-03 Haran W. Bullard, Jr. Spring adjusting device for a self-sealing coke oven door

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4002537A (en) * 1974-09-30 1977-01-11 Albert Calderon Pollution control of coke ovens
US4118284A (en) * 1977-10-31 1978-10-03 United States Steel Corporation Plug-type coke oven door
US4186055A (en) * 1978-06-26 1980-01-29 Saturn Machine & Welding Co., Inc. Coke oven door
US4172769A (en) * 1978-09-27 1979-10-30 Koppers Company, Inc. Coke oven door seal and jamb
US4425191A (en) * 1979-03-29 1984-01-10 Silicon Technology Incorporated Arrangement for minimizing leakage from heated chambers and method for making same
US4440600A (en) * 1982-09-30 1984-04-03 Haran W. Bullard, Jr. Spring adjusting device for a self-sealing coke oven door

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12447508B2 (en) 2022-05-06 2025-10-21 Bsh Home Appliances Corporation Home cooking appliance having an integrated door glass surface cleaner for automatic removal of cooking debris

Also Published As

Publication number Publication date
CA2071203A1 (fr) 1991-05-28

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