US3584851A - Dampering systems - Google Patents

Dampering systems Download PDF

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Publication number
US3584851A
US3584851A US833010A US3584851DA US3584851A US 3584851 A US3584851 A US 3584851A US 833010 A US833010 A US 833010A US 3584851D A US3584851D A US 3584851DA US 3584851 A US3584851 A US 3584851A
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US
United States
Prior art keywords
chimney
dampering
furnace
air
nozzle
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
US833010A
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English (en)
Inventor
Clifford Inman
David George Cadwell
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.)
Pilkington Group Ltd
Original Assignee
Pilkington Brothers Ltd
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Filing date
Publication date
Application filed by Pilkington Brothers Ltd filed Critical Pilkington Brothers Ltd
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Publication of US3584851A publication Critical patent/US3584851A/en
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/24—Automatically regulating the melting process
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
    • C03B5/16—Special features of the melting process; Auxiliary means specially adapted for glass-melting furnaces
    • C03B5/235—Heating the glass
    • C03B5/237—Regenerators or recuperators specially adapted for glass-melting furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L11/00—Arrangements of valves or dampers after the fire
    • F23L11/02—Arrangements of valves or dampers after the fire for reducing draught by admission of air to flues
    • 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
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping

Definitions

  • a chimney-dampering system for regulating the pressure in a furnace includes a circumferential lip in the chimney for deflecting inwardly gas rising up the chimney adjacent its wall, and a nozzle pointing centrally downwardly to direct dampering air downwardly through the aperture defined by the lip.
  • PATENTEDJUNISIQYI 3584851 SHEET 1 [1F 3 Inventor: CLIFFORD INMAN and DAVID GEORGE CADWELL %M, M g 1% PATENTED m1 519?: 3; 5841851 SHEET 2 [1F 3 v lnuenlor: CLIFFORD INMAN and DAVID GEORGE- CAUNELL PATENTEDJUNISIQYI 3584.851
  • SHEET 3 [1F 3 iOi lrwenlor: CLIFFORD INMAN and DAVID GEORGE CADWELL DAMPERING SYSTEMS BACKGROUND OF THE INVENTION
  • This invention relates to a chimney-dampering system, more especially for use with a furnace chimney embodying a recuperator which extracts heat from the hot gases rising up the chimney.
  • a chimney-dampering system in which the chimney is provided with an inwardly projecting circumferential lip adapted to deflect inwardly gas rising up the chimney adjacent its wall, and a single nozzle disposed with its orifice pointing centrally down the chimney to direct dampering air centrally downwards through the chimney aperture defined by the lip so that in operation dampering air supplied to the nozzle is introduced downwardly into the chimney at a speed sufficient to make substantial ingress past said lip and to effect recirculation ofgases in the chimney below the lip.
  • the nozzle orifice is spaced above the level of the top of the chimney, and a wind shield is provided around the top of the chimney to shield the nozzle and the chimney top.
  • the invention also comprehends a furnace, for example a glass melting furnace, having a recuperator chimney with a dampering system as defined above.
  • the invention provides a method of operating a furnace having a chimney for exhaust gases, characterized by deflecting inwardly gas rising up the chimney adjacent its wall, and supplying dampering air centrally downwardly into that deflected air at a rate such as to effect recirculation of gasses in the location where rising gas is deflected inwardly.
  • FIG. I is a diagrammatic side elevation, partly in section, of the upper part of a recuperator chimney, fitted with a chimney dampering system according to the invention
  • FIG. 2 is a view similar toFIG. l ofa modified arrangement.
  • a substantially cylindrical vertical recuperator chimney l is formed at its top edge with an inwardly projecting horizontal circumferential lip 2 which acts to deflect inwardly hot gas 3 rising up the chimney adjacent its wall.
  • a nozzle 4 which is held in a collar 5 fixed by struts 6 to the top of the chimney is directed downwardly and centrally into the chimney and is disposed with its outlet orifice 7 substantially coaxial with the chimney, in the embodiment illustrated.
  • Dampering air is supplied from a manifold 8 through a butterfly valve 9 to the nozzle 4 and is released through the orifice 7 ofthe nozzle into the top of the chimney 1 at a speed sufficient to cause the dampering air, indicated at 10, to make substantial ingress into the chimney and thereby effect, in combination with the deflecting. action of the lip 2, recirculation of the gas in the upper portion of the chimney below the. lip 2 as indicated by the arrows 11.
  • the arrows 12 indicate the hot waste gases rising from a furnace connected to the recuperator.
  • the furnace pressure is controlled by controlling the velocity pressure of the dampering air 10 released from the nozzle 4.
  • a required change .in the furnace pressure can be effected by adjusting the valve 9 to cause a predetermined change in the volume of dampering air introduced and, conversely, undesired deviations in the furnace pressure can be corrected by control of the dampering air. It has been found that a dampering system as shown in FIG. 1 provides an effective and reliable furnace pressure control.
  • the orifice 7 of the nozzle 4 is substantially level with the top lip 2 of the chimney. It has been found'that even better control can be achieved by raising the nozzle orifice above the top of the chimney and lip, as shown in FIGS. 2 and 3.
  • a duct 13 leads to the nozzle 4 from a butterfly valve 14 which is connected to an air supply manifold, not shown.
  • the duct 13 includes a telescopic section 15 which, facilitates raising and lowering of the nozzle, and also holds firm the upper part of the duct 13 which terminates in the nozzle.
  • a wind shield or skirt is provided.
  • the wind shield has a floor 16 which is fixed, as indicated at 17, to the chimney, and upstanding sidewalls 18 which rise to a height such that the top of the walls 18-is at least as high as the nozzle orifice 7.-The walls 18 may be higher if particularly windy conditions are experienced.
  • the wind shield illustrated is of square-cross section (see FIG. 3) but any suitable shape may be, used, for example an octagonal shape.
  • the dimensions of the parts, and the velocity of dampering airflow are chosen to provide the optimum practicable control in relation to the conditions subsisting in any particular system.
  • the diameter of the chimney l is 36 inches, and the orifice 7 of the nozzle has a diameter of 4 inches.
  • Air is supplied through the manifold to the valve 14 by a fan supplying 2,400 cubic feet of air per minute at 8 inches water gauge.
  • the valve 14 the flow of dampering air can be controlled, for example by a computer which sets the valve in derived from a transducer connected to the furnace head-- space, as illustrated in FIG. 4.
  • the wind shield had a height such that the top of the walls 18 was approximately 1 foot above the level of the orifice 7.
  • the chimney-dampering system may be located part way down the chimney if a tall chimney is provided.
  • the location of the lip and nozzle in such circumstances is such as to permit adequate response in the regulation of the furnace pressure.
  • FIG. 4 shows schematically a glass melting furnace 19 which feeds molten glass to a forehearth, indicated generally as 20, which feeds bushings from which glass streams are attenuated to produce glass fibers in well known manner.
  • the furnace has a chimney 21 with an associated recuperator 22, which provides a heat exchange between hot exhaust gases from the furnace rising up the chimney 21 and incoming air fed through the recuperator 22 to be combined with fuel for burners in the furnace.
  • a chimney-dampering arrangement as described above, and generally indicated as 23, is mounted at the top of the chimney. Dampering air is fed to the nozzle arrangement from a fan 24 through a butterfly valve 25.
  • a pressure-sensitive probe or transducer 26 is fitted in a wall 27 of the furnace 19 at the outlet end of the furnace to detect the pressure in the furnace headspace above the molten glass, and to emit a signal indicative of the detected pressure to a control unit 28.
  • An ambient air pressure detector device 29 is positioned outside the furnace at the same level as the probe 26 and also emits a pressure indicative signal to the control unit 28. This latter signal provides a reference which permits compensation for ambient or atmospheric pressures outside of the furnace.
  • the control unit 28 compares the detected pressure in the furnace with preset values and emits a control signal indicative of the setting of the valve means 25 required to give a supply of dampering air to the nozzle arrangement 23 such as to achieve a desired preset pressure in the furnace. Such control signal serves to effect automatic adjustment of the valve means 25 as necessary.
  • control signal emitted by the control unit 28 may, instead of regulating the valve 25, be used to regulate the operation of the fan 24 such as to achieve the required supply of dampering air. It has been found, however, that regulation of the valve permits a simpler and less expensive arrangement.
  • a chimney-dampering system including an inwardly projecting circumferential lip fixed within the chimney to define a central chimney aperture and to deflect inwards gas rising up the chimney adjacent its walls, a single nozzle disposed with its orifice pointing centrally down the chimney and positioned to direct dampering air centrally downwards through the chimney aperture and means for regulating air supply to the nozzle so that in operation dampering air supplied to the nozzle is introduced downwards into the chimney at a speed sufficient to make substantial ingress past said lip and to effect recirculation ofgases in the chimney below the lip.
  • a chimney-dampering system wherein the lip is provided at the top of the chimney and the nozzle is fixed centrally to the top of the chimney to introduce dampering air downwardly into the top of the chimney.
  • a chimney-dampering system wherein a windshield is provided around the top of the chimney to shieldthe nozzle and the chimney top.
  • a chimney-dampering system according to claim 1, wherein the nozzle orifice is spaced above the level of the circumferential lip.
  • a chimney-dampering system associated with a furnace chimney, and including flow control means controlling the supply of dampering air to the nozzle in response to an indication of furnace pressure.
  • a system as claimed in claim 6, comprising pressure detector means in the furnace to detect the pressure within the furnace and to emit a signal indicative thereof, a valve in the air supply to the nozzle, and valve control means connected to said pressure detector to receive said pressure indicative signal and regulate the valve in response to that signal.
  • furnace is a glass melting furnace
  • pressure detector means is located in the furnace near its outlet end to detect the pressure in the molten glass in the furnace.
  • a method of operating a furnace having a chimney for exhaust gases characterized by deflecting inwards gas rising up the chimney adjacent its walls, supplying dampering air centrally downwards into that deflected air, and regulating the rate of supply of dampering air to effect recirculation ofgasses beneath the location where rising gas is deflected inwards.
  • a method as claimed in claim 9, of operating a glass melting furnace comprising detecting the pressure in the headspace over the molten glass in the furnace and regulating the supply of dampering air in response to pressure variations to maintain constant pressure in the headspace.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
  • Air Supply (AREA)
  • Chimneys And Flues (AREA)
  • Processing Of Solid Wastes (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Glass Melting And Manufacturing (AREA)
  • Treatment Of Fiber Materials (AREA)
US833010A 1968-06-18 1969-06-13 Dampering systems Expired - Lifetime US3584851A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2903668 1968-06-18

Publications (1)

Publication Number Publication Date
US3584851A true US3584851A (en) 1971-06-15

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Family Applications (1)

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US833010A Expired - Lifetime US3584851A (en) 1968-06-18 1969-06-13 Dampering systems

Country Status (9)

Country Link
US (1) US3584851A (fr)
BE (1) BE734751A (fr)
DE (1) DE1930972A1 (fr)
ES (2) ES368478A1 (fr)
FR (1) FR2011156A1 (fr)
GB (1) GB1238935A (fr)
NL (1) NL6909327A (fr)
SE (1) SE354907B (fr)
ZA (1) ZA694275B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3827854A (en) * 1973-10-26 1974-08-06 W Gildersleeve Automatic metal protecting apparatus and method
DE3906078A1 (de) * 1988-02-29 1989-09-07 Ahlstroem Oy Verfahren zur rueckgewinnung von waerme aus heissen prozessgasen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL182427C (nl) * 1975-12-12 1988-03-01 Hunsicker Erst Indpatent Elektrofilter met regelinrichting voor de afvoer van afvalgassen van een smeltoven.
DE4100232C2 (de) * 1991-01-07 1993-09-30 Riedhammer Gmbh Co Kg Einrichtung zur Regelung des in einem Ofenraum herrschenden Gasdrucks
ES2230963B1 (es) * 2002-11-12 2006-03-01 Abello Linde, S.A. Perfeccionamientos en los hornos de fusion de fritas ceramicas.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1635939A (en) * 1923-02-15 1927-07-12 Morgan Construction Co Apparatus for reversing and controlling regenerative furnaces
US2979322A (en) * 1957-04-03 1961-04-11 Midland Ross Corp Furnace pressure control
US3373007A (en) * 1965-11-12 1968-03-12 Owens Corning Fiberglass Corp Method and means for controlling internal furnace pressures

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1635939A (en) * 1923-02-15 1927-07-12 Morgan Construction Co Apparatus for reversing and controlling regenerative furnaces
US2979322A (en) * 1957-04-03 1961-04-11 Midland Ross Corp Furnace pressure control
US3373007A (en) * 1965-11-12 1968-03-12 Owens Corning Fiberglass Corp Method and means for controlling internal furnace pressures

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3827854A (en) * 1973-10-26 1974-08-06 W Gildersleeve Automatic metal protecting apparatus and method
DE3906078A1 (de) * 1988-02-29 1989-09-07 Ahlstroem Oy Verfahren zur rueckgewinnung von waerme aus heissen prozessgasen

Also Published As

Publication number Publication date
NL6909327A (fr) 1969-12-22
DE1930972C3 (fr) 1974-05-16
ES168006U (es) 1971-08-16
DE1930972B2 (fr) 1973-10-11
ZA694275B (en) 1971-01-27
GB1238935A (fr) 1971-07-14
ES368478A1 (es) 1971-04-01
FR2011156A1 (fr) 1970-02-27
DE1930972A1 (de) 1970-01-08
ES168006Y (es) 1972-02-01
BE734751A (fr) 1969-12-18
SE354907B (fr) 1973-03-26

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