US3460819A - Gas draft apparatus - Google Patents

Gas draft apparatus Download PDF

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Publication number
US3460819A
US3460819A US655815A US3460819DA US3460819A US 3460819 A US3460819 A US 3460819A US 655815 A US655815 A US 655815A US 3460819D A US3460819D A US 3460819DA US 3460819 A US3460819 A US 3460819A
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liquid
cap
gases
discharge end
shaft
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US655815A
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Daniel E Pike
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American Air Filter Co Inc
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American Air Filter Co Inc
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Assigned to CONNECTICUT NATIONAL BANK THE, A NATIONAL BANKING ASSOCIATION AS TRUSTEE, WOODS KATHLEEN D., AS TRUSTEE reassignment CONNECTICUT NATIONAL BANK THE, A NATIONAL BANKING ASSOCIATION AS TRUSTEE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLIS-CHALMERS CORPORATION A DE CORP.
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B1/00Shaft or like vertical or substantially vertical furnaces
    • F27B1/10Details, accessories, or equipment peculiar to furnaces of these types
    • F27B1/18Arrangements of dust collectors

Definitions

  • the present invention pertains to metallurgical apparatus and finds particular utility at the top and off-takes of metallurgical furnace shafts.
  • a new, useful, and unobvious draft apparatus for metallurgical furnaces which lends itself to ready and economical fabrication, construction and maintenance, utilizing a minimum amount of materials and requiring a minimum of time for installation.
  • the apparatus of the present invention in addition to providing a wet cap to cool the metal surfaces exposed to hot cupola gases, provides a means for selectively and alternatively affording a wet curtain through which the hot gases must pass to necessarily be scrubbed prior to entering the atmosphere.
  • the apparatus of the present invention further provides means for insuring that the hot gases pass through the liquid curtain and a liquid seal to alternatively deter the hot gases from entering the atmosphere by way of the discharge end of the stack.
  • the present invention provides apparatus for drafting hot gases comprising: shaft means having a discharge end for flow of hot gases to atmosphere; liquid receiving chamber means surrounding the shaft means below the discharge end thereof; cap means posiice tioned in spaced relationship from the discharge end of the shaft means to permit passage of gases therebetween; liquid discharge means cooperating with the cap means to provide a liquid curtain through which gases flow to atmosphere; the cap means having a lower depending skirt portion extending therefrom into the liquid receiving chamber means; and liquid level control means cooperating with the liquid receiving chamber means to selectively maintain a liquid level therein above the depending skirt portion of the cap means to selectively provide a liquid curtain and a liquid seal at the discharge end of the shaft means.
  • Cupola 1 includes a metal charging inlet 2 and stack shaft 3, the shaft 3 having a hot gas bypass conduit 4 through which hot gases can be by-passed from stack 3 to suitable gas treating equipment known in the art and not shown. Since the present invention can be utilized with any one of several types of metallurgical furnaces, cupola 1 is disclosed in its broadest form without details.
  • Cap 8 Arranged to surround shaft 3 below discharge end 6 thereof is liquid receiving chamber 7. Disposed within chamber 7 in spaced relationship about discharge end 6 of shaft 3 is wet cap 8. Cap 8 includes an upper conical portion 9 and a lower depending skirt portion 11, which skirt portion extends above and below the discharge end 6 of the shaft into liquid receiving chamber 7.
  • liquid discharge conduit 12 Positioned above conical portion 9 of cap 8 is liquid discharge conduit 12, the conduit being arranged to discharge a suitable liquid such as water at the apex of conical portion 9 of wet cap 8. Further positioned above cap 8 in spaced relationship above liquid discharge conduit 12 is ejector conduit 13. Ejector conduit 13 which can be connected in a suitable manner not shown to hot blast air from the cupola system or to some other suitable hot blast air source is arranged to eject such blast of air along the direction of gas flow away from wet cap 8 as to provide additional pressure to the hot gases emitted from stack 3 and thus overcome the resistance occasioned by wet cap 8 above the shaft.
  • liquid chamber 7 is provided with a liquid level control means in the form of an upper valve 14 and a lower valve 16.
  • Valve 14 is selectively positioned above the bottom edge of lower depending skirt portion 11 of cap 8, while valve 16 is selectively positioned well below the bottom edge of skirt portion 11.
  • Apparatus for drafting hot gases comprising shaft means having a discharge end for flow of gases to atmosphere; liquid receiving chamber means surrounding said shaft means below said discharge end thereof; cap means positioned in spaced relation from said discharge end of said shaft means to permit passage of gases therebetween; liquid discharge means cooperating with said cap means to provide a liquid curtain through which gases flow to atmosphere; said cap means having a lower depending skirt portion extending therefrom into said liquid receiving chamber means; and liquid level control means cooperating with said liquid receiving chamber means to selectively maintain a liquid level therein above said depending skirt portion of said cap means to selectively provide a liquid curtain and a liquid seal at said discharge end of said shaft means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)

Description

Aug. 12, 1969 o. E. FIKE GAS DRAFT APPARATUS Filed July 25. 1967 INVENTOR. DANIEL E. PIKE ATTORNEY United States Patent 3,460,819 GAS DRAFT APPARATUS Daniel E. Pike, Louisville, Ky., assignor to American Air Filter Company, Inc., Louisville, Ky., a corporation of Delaware Filed July 25, 1967, Ser. No. 655,815 Int. Cl. C21b 7/08; F23j /00; F231 17/16 U.S. Cl. 266--31 3 Claims ABSTRACT OF THE DISCLOSURE Apparatus for drafting hot gases in a metallurgical system including an improved wet cap arrangement cooperating with the discharge end of a hot gas conduit to selectively provide a gas treating liquid curtain and a liquid seal.
BACKGROUND OF THE INVENTION The present invention pertains to metallurgical apparatus and finds particular utility at the top and off-takes of metallurgical furnace shafts.
In metallurgical furnace shafts, such as shafts of metal melting cupolas, it is common to provide a wet cap arrangement adjacent the discharge end of the shaft to cool the metal surfaces exposed to hot cupola gases. To selectively prevent emission of gases from the discharge end of cupola and thereby permit bypass of such gases to a gas cleaning system, it also has been common to provide a mechanical damper arrangement at the stack discharge. For the most part, such arrangements have been comparatively complex in construction, installation, and operation, not only requiring a substantial amount of costly construction materials, but in addition, requiring a considerable amount of time in fabrication, construction and maintenance. Further, in such past arrangements when hot gases have been allowed to pass from the discharge end of the stack into the atmosphere, such gases have been heavily laden with gas contaminant materials.
SUMMARY OF THE INVENTION In accordance with the present invention, a new, useful, and unobvious draft apparatus for metallurgical furnaces is provided which lends itself to ready and economical fabrication, construction and maintenance, utilizing a minimum amount of materials and requiring a minimum of time for installation. Further, the apparatus of the present invention, in addition to providing a wet cap to cool the metal surfaces exposed to hot cupola gases, provides a means for selectively and alternatively affording a wet curtain through which the hot gases must pass to necessarily be scrubbed prior to entering the atmosphere. The apparatus of the present invention further provides means for insuring that the hot gases pass through the liquid curtain and a liquid seal to alternatively deter the hot gases from entering the atmosphere by way of the discharge end of the stack.
Various other features of the present invention will become obvious to one skilled in the art upon reading the disclosure set forth hereinafter.
More particularly, the present invention provides apparatus for drafting hot gases comprising: shaft means having a discharge end for flow of hot gases to atmosphere; liquid receiving chamber means surrounding the shaft means below the discharge end thereof; cap means posiice tioned in spaced relationship from the discharge end of the shaft means to permit passage of gases therebetween; liquid discharge means cooperating with the cap means to provide a liquid curtain through which gases flow to atmosphere; the cap means having a lower depending skirt portion extending therefrom into the liquid receiving chamber means; and liquid level control means cooperating with the liquid receiving chamber means to selectively maintain a liquid level therein above the depending skirt portion of the cap means to selectively provide a liquid curtain and a liquid seal at the discharge end of the shaft means.
It is to be understood that various changes can be made in the arrangement, form and construction of the apparatus disclosed herein by one skilled in the art without departing from the scope or spirit of the present invention.
Referring to the drawing, there is disclosed a partially broken away elevational view of one advantageous embodiment of the present invention incorporated with a cupola-type furnace.
Cupola 1 includes a metal charging inlet 2 and stack shaft 3, the shaft 3 having a hot gas bypass conduit 4 through which hot gases can be by-passed from stack 3 to suitable gas treating equipment known in the art and not shown. Since the present invention can be utilized with any one of several types of metallurgical furnaces, cupola 1 is disclosed in its broadest form without details.
Arranged to surround shaft 3 below discharge end 6 thereof is liquid receiving chamber 7. Disposed within chamber 7 in spaced relationship about discharge end 6 of shaft 3 is wet cap 8. Cap 8 includes an upper conical portion 9 and a lower depending skirt portion 11, which skirt portion extends above and below the discharge end 6 of the shaft into liquid receiving chamber 7.
Positioned above conical portion 9 of cap 8 is liquid discharge conduit 12, the conduit being arranged to discharge a suitable liquid such as water at the apex of conical portion 9 of wet cap 8. Further positioned above cap 8 in spaced relationship above liquid discharge conduit 12 is ejector conduit 13. Ejector conduit 13 which can be connected in a suitable manner not shown to hot blast air from the cupola system or to some other suitable hot blast air source is arranged to eject such blast of air along the direction of gas flow away from wet cap 8 as to provide additional pressure to the hot gases emitted from stack 3 and thus overcome the resistance occasioned by wet cap 8 above the shaft.
As will be noted in the drawing, liquid chamber 7 is provided with a liquid level control means in the form of an upper valve 14 and a lower valve 16. Valve 14 is selectively positioned above the bottom edge of lower depending skirt portion 11 of cap 8, while valve 16 is selectively positioned well below the bottom edge of skirt portion 11. By controlling the relative open and closed positions of valves 14 and 16 and the pressure through ejector 13, it is possible to selectively provide a liquid seal for shaft 3, or alternatively, a wet scrubbing curtain through which the hot gases necessarily must pass before being emitted to atmosphere.
The invention claimed is:
1. Apparatus for drafting hot gases comprising shaft means having a discharge end for flow of gases to atmosphere; liquid receiving chamber means surrounding said shaft means below said discharge end thereof; cap means positioned in spaced relation from said discharge end of said shaft means to permit passage of gases therebetween; liquid discharge means cooperating with said cap means to provide a liquid curtain through which gases flow to atmosphere; said cap means having a lower depending skirt portion extending therefrom into said liquid receiving chamber means; and liquid level control means cooperating with said liquid receiving chamber means to selectively maintain a liquid level therein above said depending skirt portion of said cap means to selectively provide a liquid curtain and a liquid seal at said discharge end of said shaft means.
2. The apparatus of claim 1 and aspirating means to selectively induce the flow of gas around the depending skirt portion of said cap means.
3. The apparatus of claim 1, the upper portion of said cap means being of conical configuration, said liquid discharge means being positioned to discharge liquid above the apex of said conical upper portion of said cap means.
References Cited J. SPENCER OVERHOLSER, Primary Examiner JOHN S. BROWN, Assistant Examiner US. Cl. X.R.
l19, 26ll7, 121
US655815A 1967-07-25 1967-07-25 Gas draft apparatus Expired - Lifetime US3460819A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4392875A (en) * 1981-02-11 1983-07-12 Celis Roberto V Smog eliminator
US4801315A (en) * 1985-07-03 1989-01-31 Wolfgang Mauerhoff Device for the wet cleaning of flue gas
US5201919A (en) * 1991-12-17 1993-04-13 Inline Scrubber Corporation Integral in-line gas scrubber
US6467949B1 (en) 2000-08-02 2002-10-22 Chemineer, Inc. Static mixer element and method for mixing two fluids
ITVI20090245A1 (en) * 2009-10-07 2011-04-08 Gruppo Effe 2 Spa HYDRAULIC FILTER PERFECTED FOR PURIFICATION OF CHIMNEY FUMES
US11772033B2 (en) * 2016-12-15 2023-10-03 Alejandro Fidel Brito Apparatus and method for reducing pollution emitted by an industrial exhaust source

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736541A (en) * 1949-12-01 1956-02-28 Maiman Herbert Spark arrester
US2937013A (en) * 1956-04-20 1960-05-17 Ernest F Fisher Water cooled deflectors used in fly ash suppression systems
US3045990A (en) * 1959-04-10 1962-07-24 Jr Thomas J Keenan Draft regulator and scrubber
US3197186A (en) * 1962-04-03 1965-07-27 Steiu & Roubaix Sa Dust-collecting hopper and cooling hood for converters

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736541A (en) * 1949-12-01 1956-02-28 Maiman Herbert Spark arrester
US2937013A (en) * 1956-04-20 1960-05-17 Ernest F Fisher Water cooled deflectors used in fly ash suppression systems
US3045990A (en) * 1959-04-10 1962-07-24 Jr Thomas J Keenan Draft regulator and scrubber
US3197186A (en) * 1962-04-03 1965-07-27 Steiu & Roubaix Sa Dust-collecting hopper and cooling hood for converters

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4392875A (en) * 1981-02-11 1983-07-12 Celis Roberto V Smog eliminator
US4801315A (en) * 1985-07-03 1989-01-31 Wolfgang Mauerhoff Device for the wet cleaning of flue gas
US5201919A (en) * 1991-12-17 1993-04-13 Inline Scrubber Corporation Integral in-line gas scrubber
US6467949B1 (en) 2000-08-02 2002-10-22 Chemineer, Inc. Static mixer element and method for mixing two fluids
ITVI20090245A1 (en) * 2009-10-07 2011-04-08 Gruppo Effe 2 Spa HYDRAULIC FILTER PERFECTED FOR PURIFICATION OF CHIMNEY FUMES
US11772033B2 (en) * 2016-12-15 2023-10-03 Alejandro Fidel Brito Apparatus and method for reducing pollution emitted by an industrial exhaust source

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Owner name: CONNECTICUT NATIONAL BANK THE, A NATIONAL BANKING

Free format text: SECURITY INTEREST;ASSIGNOR:ALLIS-CHALMERS CORPORATION A DE CORP.;REEL/FRAME:004149/0001

Effective date: 19830329

Owner name: WOODS KATHLEEN D., AS TRUSTEE

Free format text: SECURITY INTEREST;ASSIGNOR:ALLIS-CHALMERS CORPORATION A DE CORP.;REEL/FRAME:004149/0001

Effective date: 19830329