US3679193A - Valve packing for metallurgical shaft furnaces - Google Patents

Valve packing for metallurgical shaft furnaces Download PDF

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Publication number
US3679193A
US3679193A US45371A US3679193DA US3679193A US 3679193 A US3679193 A US 3679193A US 45371 A US45371 A US 45371A US 3679193D A US3679193D A US 3679193DA US 3679193 A US3679193 A US 3679193A
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US
United States
Prior art keywords
valve
sealing
valve seat
valve member
furnace
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
US45371A
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English (en)
Inventor
Pieter Hendrik Nieboer
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.)
Mannesmann Demag AG
Original Assignee
Demag AG
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 Demag AG filed Critical Demag AG
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Publication of US3679193A publication Critical patent/US3679193A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/18—Bell-and-hopper arrangements
    • 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
    • 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
    • F27B1/20—Arrangements of devices for charging
    • 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
    • F27D99/0073—Seals
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/10—Charging directly from hoppers or shoots
    • F27D2003/105—Charging directly from hoppers or shoots using shutters
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes
    • Y10T137/0402—Cleaning, repairing, or assembling
    • Y10T137/0419—Fluid cleaning or flushing
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/4238—With cleaner, lubrication added to fluid or liquid sealing at valve interface
    • Y10T137/4245—Cleaning or steam sterilizing
    • Y10T137/4259—With separate material addition
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/4238—With cleaner, lubrication added to fluid or liquid sealing at valve interface
    • Y10T137/4358—Liquid supplied at valve interface
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/8593—Systems
    • Y10T137/87265—Dividing into parallel flow paths with recombining
    • Y10T137/87298—Having digital flow controller

Definitions

  • a valve closure member includes an inner portion having a cross section which makes it more flexible than an outer thicker portion.
  • the outer sealing rim is formed in the thickened outer portion and it is rounded.
  • the valve seat defined at the lower end of the charging hopper advantageously includes an annular groove which is connected to a source of gas under pressure and the groove is located over the rounded sealing rim of the valve member. Gas under pressure is directed to and through the groove and blows against the sealing rim of the valve member to provide the double function of preventing escape of gases from the furnace and cleaning the seat of the valve member for proper sealing purposes.
  • This invention relates in general, to the construction of metallurgical furnaces, and in particular, to a new and useful valve construction for shaft furnaces, particularly for blast furnaces which are operable at high pressures, and'wherein the valve member provides a pressure lock at the furnace throat at the location of a sealing surface or valve seat located outside of the stream of the charged material.
  • valve construction which includes sealing parts having a high efficiency, despite higher temperature and dust entrainment in the environment employed and despite certain properties of flue gas dust in metallurgical operations which take place at high velocities and high pressures.
  • the valve seat of the valve is advantageously located at the connection of the hopper to the furnace throat and located in a recessed area out of the stream of flow of the material.
  • a valve member which is adapted to be pivotally mounted adjacent one side of the discharge of the hopper includes a central or inner portion having a cross section which makes it more flexible than an outer wider portion at the periphery.
  • a sealing rim or sealing edge is defined at the upper part of the outer portion which is rounded.
  • the elasticity of the inner portion of the valve member causes an adaptation of the sealing edge to the sealing surface even if, at higher temperatures, a deformation of the valve should occur. Also an elevated internal pressure, which is precisely what the seal is employed for delimiting, can be utilized inasmuch as with an increase of internal pressure the elasticity of the valve permits a higher sealing force. If, in fact,
  • valve member is subject to a socalled membrane effect which causes the sealing ring to migrate outwardly by a small amount.
  • the abrading effect connected therewith permits, surprisingly, the pushing aside of any dust of any dirt present on the sealing surfaces so that there is a self-cleaning effect. Both sealing surfaces therefore obtain a mutually optimum bearing content which permits excellent sealing even with high pressure conditions.
  • the rounding of the outer portion or rim of the valve member contributes to the construction of a sealing rim of desirable width in every bending position of the membrane construction of the valve member.
  • the valve member advantageously includes an annular sealing rim of oval shape which is planar and ground (polished).
  • the sealing rim of the sealing valve therefore rolls off on the ground surface during periods of different internal gas pressure admission, that is during pressure build-up.
  • a smooth surface facilitates removing the dirt and further facilitates the sliding, or rolling off, of the corresponding parts of the circumference line of the valve cross section.
  • the sealing surface, or groove of the valve seat is provided with an encircling groove in the oval zone of the sealing rim of the valve member.
  • the groove is centered in respect to the actual seating area, and it provides a means for admitting a gas under pressure at such location in order to prevent dust accumulation.
  • the rim of the valve member can take support on two points at the oval circumference of the valve seat and it is therefore possible to attain a particularly good sealing effect in the pressure build up.
  • the elasticity of the sealing valve member contributes to the straightening of warped sealing valves and the adapting of them to the form of the groove edges of the valve seat.
  • the cross sectional edges of the encircling groove are designed in the form of an oval to provide an exact adaptation of the sealing rim surface of the valve member to the sealing edges of the valve seat.
  • the groove is connected to means for supplying an inert gas under pressure through the groove and over the valve seat and the rim of the valve member forming the closure. In the opened position of the sealing valve, therefore, a relatively-large amount of inert gas depending on the pressure conditions will flow through the groove and over the seat and the rim of the valve member to clean both and also to prevent the escape of dust laden flue gas from the furnace through the hopper.
  • the construction therefore improves the sealing effect of the valve packing in several respects.
  • the parts forming the sealing surfaces be such that they may be exchanged after relatively long periods of use. It is therefore expedient to arrange the portion of the valve seat ring of a plurality of interengageable ring flange elements which may be located on the head of the furnace and form a connection from the furnace to the storage bunkers thereabove.
  • the groove centered in the valve seat may be formed by two rings arranged concentrically and having difierent diametrical dimensions to permit their interengagement. This simplifies the production of such rings and the formation of the groove gap therebetween.
  • Such surfaces can be machined on a lathe or ground on suitable grinding equipment to form the sealing surfaces. The construction makes it possible to replace the rings easily and to keep them in a ready supply for replacement as need be. Any rings which no longer seal may be rapidly exchanged.
  • a further desirable effect of the inventive construction is in respect to process engineering. It is intended to retain the valve just before it reaches the sealing position to leave it temporarily open in this position and then to accelerate the inert gas stream and only then to transmit the full sealing force to the sealing valve rim. With such a procedure there is caused a surprising effect of self-cleaning. To retain the sealing valve just before it reaches the sealing position, ensures that a narrow flow channel is formed in which the inert gas momentarily undergoes an accelleration and thus exerts a better cleaning action. If therefore, especially before the closing of a sealing valve, the seal-cleaning is carried out; then the sealing seat is, with the greatest certainity,in a desired state immediately the closing of the valve.
  • valve sealing construction for a metallurgical furnace which includes a valve member having a wire rim cross section then a central cross section so as to provide a certain flexibility to the interior portion and which includes a rounded rim engageable with a valve seat which is adapted to be recessed in a position out of these charging material flow.
  • a further object of the invention is to provide a valve construction which includes a valve member having a thickened widened rounded rim which is closeable against a seat having a'sealing surface with an oval sealing seat interrupted centrally by a groove, and wherein the groove is advantageously connectible to an inert gas under pressure which blows through the groove and the seat to clean the seat and the rim of the valve member during operation.
  • a furtherobject of the invention is to provide a method for operating a valve packing wherein the valve is moved so that it was retained just before it reaches the sealingposition and temporarily left in this position, an inert gas is then delivered through an opening in the valve seat and is accelerated while the valve member is in the temporary position and only then is the full sealing force transmitted to the sealing valve member through the rim.
  • a further object of the invention is to provide a sealing valve construction for a metallurgical furnace which is simple in design, rugged in construction, and economical to manufacture.
  • FIG. 1 is a partial transverse section of a valve construction for the connection between a hopper and a furnace head constructed in accordance with the invention
  • FIG. 2 is a partial sectional view of another embodiment of the invention.
  • FIG. 3 is a view of the apparatus indicated in FIG. 2 shown in a partially opened or partially closed position.
  • FIG. 1 includes a valve closure assembly for regulating the flow of a charging material from a hopper 1 into the head portion of a blast furnace 5.
  • the valve closure assembly includes a ring flange or attachment member 2 extending between the hopper 1 and the furnace 5, and defining a valve sealing surface or valve seat 4 on an underside of a bottom flange portion 2a of the ring at a location in which the seat 4 is out of the flow path of the material moving through the hopper 1 into the blast furnace head 5.
  • the construction of the invention is used in place of the conventional bell for closing off the charging flow.
  • the valve seat 4 is flat and therefore is made especially smooth by grinding.
  • a valve member, or seal valve, generally designated 6 is pivotally mounted at 30 about its one end 6a to permit it to be moved to a closed position indicated in the drawings or pivoted to one side of the flow channel 1a of the hopper in an opened position which permits the equalization of the hopper pressure to the furnace pressure and also the flow of material in some instances.
  • the valve member 6 includes a relatively thin walled inner cross sectional zone or portion 7 and an outer peripheral or marginal portion 8 having a thickened or widened sectional formation.
  • An intermediate wall portion 9 of the valve member is arched similar to a membrane or diaphragm.
  • the outer cross sectional zone 8 has a sealing rim 10 of rounded form defined along its upper edge. The rim 10 is arched in a manner such that there is always formed a relatively wide contact area 11 in the form of an encircling ring around the circumference of the valve member 6 regardless of the annular position which the inner cross section 7 of the sealing valve member 6.
  • a charging hopper 1 includes a ring member connection 2 between it and a furnace head or top portion 5
  • a valve seat 4' is formed with an oval shaped receiving seat portion 4a which is intersected by an annular groove 12 which extends completely around the circumference of the seat 4' as shown by dotted line 15.
  • the ring assembly 2' is made of two separate ring parts 13 and 14 which are arranged concentrically together to form the groove 12.
  • the oval groove 40 includes separated curved sections 16 and 17 which correspond together to the general shape of the sealing rim [0 of a valve member 6'.
  • One or more conduits 18 are connected to the groove 12 at the upper or inner end thereof and a gas under pressure, such as an inert gas, is directed in the direction of the arrow 19 through the conduit 18 and into the grooves 12.
  • the ring assembly 2' can also be formed by ring parts such as the parts 13 and 14, which are designed as inserted elements, that is, they are indpendent of rings which are inserted in the base body of the ring flange assembly 2. Such a construction facilitates the production or the exchange of the ring parts 13 and 14.
  • FIG. 3 the method of operation of the valve assembly indicated in FIG. 2 is shown.
  • the inert gas flows under pressure in the direction of the arrows 19 through the channels 18 and into the groove 12 and then impinges on the sealing rim 10 over the highest point 11 thereof.
  • This impingement divides the gas flow into two narrow flow cross sections of high flow velocity.
  • any dust adherring on the sealing rim is blown away.
  • the counter pressure of the inert gas consequently contributes to the mainteneance of the pressure difference between the hopper and the top of the furnace 5" and, in addition, the gas flow aids in preventing the escape of gases from the furnace zone 22.
  • valve member 6' is retained just below the exit to the groove 12 temporarily when it is moved to closing engagement with the valve seat 4'. While it is temporarily left in this position, the inert gas stream is accelerated and thereafter the full sealing energy force is transmitted to the sealing valve rim.
  • a valve construction for a furnace such as a pressure operated blast furnace for location between a discharge opening of a charging hopper and said furnace,.comprising ring means adapted to be positioned around said discharge opening and having an undersurface defining an annular substantially horizontal valve seat surrounding and offset laterally from the discharge opening and the flow path of the charging material, and a valve member movable toward and away from said valve seat, said valve member comprising a flexible diaphragm having outer and inner portions of different crosssection, the inner portion having cross-section such that it is more flexible than said outer portion, said outer portion extending around the periphery of said valve and defining a rounded sealing rim having a top portion engageable with said valve seat.
  • valve seat defines an oval recessed portion for sealing with said valve member, said valve member outer portion being oval.
  • a valve construction according to claim 1, wherein said ring means undersurface defines said valve seat, a groove extending inwardly from said undersurface and defining an annular encircling groove having an entrance mouth forming a sealing recess for said rim portion of said valve member.
  • valve seat includes a curved portion on each side of the entrance to said groove for receiving said sealing rim of said valve member.
  • a valve construction including means for directing an inert gas into said groove said ring means comprising at least exchangeable ring member.
  • said ring means includes first and second ring members said ring members, together defining an annular groove having a mouth portion forming said valve seat at least one of said ring members being exchangeable.
  • a method of operating a pressure seal valve between a hopper and a furnace head using a valve member having a sealing rim portion engageable in a recess sealing seat of a ring member located between the hopper and the furnace comprising moving the valve member in a closing direction toward said valve seat, stopping the movement of said valve just prior to engagement with said valve seat and directing an inert-gas from said valve seat across the surface of said sealing rim to affect the cleaning of the valve seat and the sealing rim, and thereafter applying a full sealing force of the valve member to tightly seal said valve rim with said valve seat.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Sealing Devices (AREA)
  • Blast Furnaces (AREA)
  • Details Of Valves (AREA)
US45371A 1969-10-01 1970-06-11 Valve packing for metallurgical shaft furnaces Expired - Lifetime US3679193A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1949471A DE1949471C3 (de) 1969-10-01 1969-10-01 Klappendichtung fur Schachtofen, insbesondere fur im Hochdruckverfahren betreibbare Hochofen

Publications (1)

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US3679193A true US3679193A (en) 1972-07-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
US45371A Expired - Lifetime US3679193A (en) 1969-10-01 1970-06-11 Valve packing for metallurgical shaft furnaces

Country Status (6)

Country Link
US (1) US3679193A (enrdf_load_stackoverflow)
JP (1) JPS5328363B1 (enrdf_load_stackoverflow)
AT (1) AT309485B (enrdf_load_stackoverflow)
DE (1) DE1949471C3 (enrdf_load_stackoverflow)
FR (1) FR2059919A5 (enrdf_load_stackoverflow)
GB (1) GB1307558A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955693A (en) * 1972-09-20 1976-05-11 S.A. Des Anciens Etablissements Paul Wurth Method and apparatus for cooling and cleaning the sealing surface of a valve
US4444219A (en) * 1981-06-29 1984-04-24 Wipf Ag Verpackungen Overpressure valve for packages with flexible walls
DE3939170A1 (de) * 1988-12-30 1990-07-05 Wurth Paul Sa Verschlussklappe fuer einen schachtofen
US5676170A (en) * 1992-12-22 1997-10-14 Paul Wurth S.A. Gastight isolation valve for solid materials
US20080223458A1 (en) * 2007-03-16 2008-09-18 Rajewski Robert C Tank vent pallet
RU2447160C1 (ru) * 2011-01-31 2012-04-10 Александр Анатольевич Иванов Газоуплотнительный клапан загрузочного устройства доменной печи
US10113799B2 (en) * 2014-06-06 2018-10-30 Paul Wurth S.A. Gearbox assembly for a charging installation of a metallurgical reactor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS548061U (enrdf_load_stackoverflow) * 1977-06-17 1979-01-19

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1742733A (en) * 1927-10-10 1930-01-07 Stoecker Julius Device for retaining the flue dust in blast furnaces
US1868924A (en) * 1931-01-09 1932-07-26 Western Gas Construction Co Fuel charging device for gas generators
US2765935A (en) * 1948-03-24 1956-10-09 Republic Steel Corp Clean gas seal for bell and hopper
US3182983A (en) * 1961-04-18 1965-05-11 Yawata Iron & Steel Co Air-tight sealing device for the top of a blast furnace

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1742733A (en) * 1927-10-10 1930-01-07 Stoecker Julius Device for retaining the flue dust in blast furnaces
US1868924A (en) * 1931-01-09 1932-07-26 Western Gas Construction Co Fuel charging device for gas generators
US2765935A (en) * 1948-03-24 1956-10-09 Republic Steel Corp Clean gas seal for bell and hopper
US3182983A (en) * 1961-04-18 1965-05-11 Yawata Iron & Steel Co Air-tight sealing device for the top of a blast furnace

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3955693A (en) * 1972-09-20 1976-05-11 S.A. Des Anciens Etablissements Paul Wurth Method and apparatus for cooling and cleaning the sealing surface of a valve
US4444219A (en) * 1981-06-29 1984-04-24 Wipf Ag Verpackungen Overpressure valve for packages with flexible walls
DE3939170A1 (de) * 1988-12-30 1990-07-05 Wurth Paul Sa Verschlussklappe fuer einen schachtofen
DE3939170C2 (de) * 1988-12-30 1998-05-14 Wurth Paul Sa Verschlußklappe für einen Schachtofen
US5676170A (en) * 1992-12-22 1997-10-14 Paul Wurth S.A. Gastight isolation valve for solid materials
US20080223458A1 (en) * 2007-03-16 2008-09-18 Rajewski Robert C Tank vent pallet
RU2447160C1 (ru) * 2011-01-31 2012-04-10 Александр Анатольевич Иванов Газоуплотнительный клапан загрузочного устройства доменной печи
US10113799B2 (en) * 2014-06-06 2018-10-30 Paul Wurth S.A. Gearbox assembly for a charging installation of a metallurgical reactor

Also Published As

Publication number Publication date
AT309485B (de) 1973-08-27
DE1949471A1 (de) 1971-04-08
FR2059919A5 (enrdf_load_stackoverflow) 1971-06-04
DE1949471C3 (de) 1973-10-31
DE1949471B2 (de) 1973-03-29
JPS5328363B1 (enrdf_load_stackoverflow) 1978-08-14
GB1307558A (en) 1973-02-21

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