US3799502A - Adjustable venturi throat for the purification of blast furnace gases - Google Patents

Adjustable venturi throat for the purification of blast furnace gases Download PDF

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Publication number
US3799502A
US3799502A US00269924A US26992472A US3799502A US 3799502 A US3799502 A US 3799502A US 00269924 A US00269924 A US 00269924A US 26992472 A US26992472 A US 26992472A US 3799502 A US3799502 A US 3799502A
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United States
Prior art keywords
dampers
throat
unmounted
damper
venturi apparatus
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Expired - Lifetime
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US00269924A
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English (en)
Inventor
J Baum
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Verfahrenstechnik Dr Ing Kurt Baum
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Verfahrenstechnik Dr Ing Kurt Baum
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/002—Evacuating and treating of exhaust gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/10—Venturi scrubbers
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
    • C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
    • C21B2100/44—Removing particles, e.g. by scrubbing, dedusting

Definitions

  • ABSTRACT This disclosure teaches an adjustable venturi throat for dust purification of blast furnace gases, operating at up to sonic velocities with a substantially constant pressure drop, adjusted by dampers having a length of approximately one half the width of the throat. ln a preferred embodiment the dampers are streamlined in shape, with the narrower ends swinging in mirror images to form a nozzle curve. The ends may be adapted to form a roller-type closure when the dampers are fully closed.
  • Adjustable venturi throats which are known, for instance, for purification of blast furnace gases permit adaptation to varying gas flows while maintaining a constant pressure loss. They have long throat dampers with a closing angle of from to and a practically linear control characteristic. With these dampers a very small angle of rotation effects a considerable change in cross section of the throat. Such a characteristic is unsuitable when operating with very high velocities which can rise up to the sonic region because the control can reverse in an instable region. This region can neither be avoided nor controlled when using the known dampers. The degree of dust removal decreases in this region down to values which are unusable.
  • the present invention solves the problem of creating a venturi throat with dampers which, within the region of the speed of sound, assure sensitive control necessaryin that region.
  • dampers in such a manner that large angles of rotation change the cross section of the throat only slightly.
  • the new venturi throat is so developed that dampers of a length which corresponds approximately to half the width of the throat of the venturi serve to control the cross section of the throat of venturi dust precipitators which are operated up to the region of the velocity of sound.
  • a further feature consists of streamlined dampers the outer edges of which swing as mirror images to each the throat dampers form a part of the wall of the venturi.
  • throat dampers are adjustable, for instance by means of bayonet guides.
  • the new invention results in substantial advances in the art.
  • the increase of the flow in the venturi to sonic speed increases the degree of dust removal considerably and improves the size of particles which can be separated to submicroscopic smallness. Breaking down of pressure or pressure control effect is considerable at these high speeds.
  • the reaction on the control of the pressure in the throat of a blast furnace is in accordance herewith.
  • the new throat dampers have an extremely short, compact construction, as well as a small angle of closure. However, they may be developed also for longitu dinal displacement and then, if necessary, can be adapted subsequently to desired control tasks.
  • FIG. 1 shows the fundamental relationship between damper length and control characteristic.
  • FIG. 2 serves to explain the special control characteristic of the new invention.
  • FIG. 3 shows control characteristics for different damper lengths compared with each other.
  • FIG. 4 is a diagrammatic longitudinal section through an illustrative new throat.
  • FIG. 5 is a cross section through a throat damper in extended condition.
  • FIG. 6 is a cross section corresponding to FIG. 5 with the damper in retracted condition.
  • FIG. 2 reflects this mathematical relationship with respect to the throat dampers in the dimensions in accordance with the invention in order to show the higher value of use corresponding to the derivation.
  • FIG. 3 shows this result in particular for the region of high speeds.
  • a mirror-image arrangement of short throat dampers l is installed swingably in corresponding recesses of a venturi throat 3 as venturis 4 in such a manner that upon complete opening of the dampers the wall 8 of the venturi throat is continued in flush and smooth fashion and continues into the inner wall of the dampers 7.
  • the dampers are shown in dotted line, as can be noted from FIG. 4.
  • the dampers 1 have a length 2 which corresponds to about half the width of the throat 4. It can furthermore be noted in FIG. 4 that the dampers 1 are of streamlined contour. Their outer edges 5 swing as mirror images to each other to form a nozzle curve 6. Furthermore, FIG. v4 shows that the throat dampers 1 have a closure angle of between 60 and 90. In their closed position, the throat dampers roll on each other in the manner of a roller-type closure.
  • FIGS. 5 and 6 show, on an enlarged scale, a throat damper 1 in an embodiment which is enlarged as compared with FIG. 4. It can be seen that the dampers l are divided in two parts. The front ends 5 of the dampers are supported by means of a bayonet guide 9 for longitudinal displacement in the rear swing ends so that the length 2 can be considerably increased or reduced without the shape or the mechanical strength of the damper being impaired.
  • the longitudinal displaceability of the control dampers can also be achieved by other means well known to the man skilled in the art.
  • a venturi apparatus for dust precipitation adaptable to varying rates of flow of gas while maintaining a substantially constant pressure drop at operation up to sonic velocities, having a throat with an adjustable cross-sectional opening controlled by a pair of dampers each mounted pivotally on one end, each of the damp ers having an adjustable length equal at its maximum to approximately one half the width of the throat.
  • each of the dampers is streamlined in shape becoming narrower progressively from the pivotally mounted end to its unmounted end, the dampers pivot in mirrorimage relationships, positioning of the unmounted ends creating the throat.
  • a venturi apparatus with the throat defined by a wall having recesses adapted to receive the dampers, the recesses so shaped that when the dampers are fully open and retracted therein they form substantially continuous surfaces with adjacent portions of the walls.
  • a venturi apparatus for dust precipitation adaptable to varying rates of flow of gas while maintaining a substantially constant pressure drop at operation up to sonic velocities, having a throat with an adjustable cross-sectional opening controlled by a pair of dampers each mounted pivotally on one end, each of the dampers having an adjustable length equal at its maximum to approximately one half the width of the throat, each of the dampers streamlined in shape becoming narrower progressively from the pivotally mounted end to its unmounted end, the dampers pivoting in mirror-image relationships, positioning of the unmounted ends creating the throat, the dampers having a closure angle of between 60 and 90, the unmounted end of each damper adapted for cooperatively rolling with the unmounted end of the other damper of the pair to the final closed position of the dampers to form a roller-type closure, the throat defined by a wall having recesses adapted to receive the dampers, the recesses so shaped that when the dampers are fully open and retracted therein they form substantially continuous surfaces with adjacent portions of the walls.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Lift Valve (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US00269924A 1971-07-17 1972-07-10 Adjustable venturi throat for the purification of blast furnace gases Expired - Lifetime US3799502A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2135840A DE2135840A1 (de) 1971-07-17 1971-07-17 Verstellbare venturikehle zur reinigung von hochofengasen

Publications (1)

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US3799502A true US3799502A (en) 1974-03-26

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DE (1) DE2135840A1 (OSRAM)
FR (1) FR2146280B1 (OSRAM)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007025A (en) * 1973-11-06 1977-02-08 Gottfried Bischoff Bau Kompl. Apparatus for cleaning stack gas and using same for generation of electric power
US4300749A (en) * 1979-12-13 1981-11-17 Allis-Chalmers Corporation Throttle valve
US5010915A (en) * 1990-06-06 1991-04-30 Ebw, Inc. Two stage automatic shut off valve
US5095937A (en) * 1990-06-06 1992-03-17 Ebw, Inc. Two stage automatic shut off valve
US5141019A (en) * 1990-06-06 1992-08-25 Ebw, Inc. Two stage automatic shutoff valve
US5241989A (en) * 1986-05-30 1993-09-07 Plattco Corporation Reduced height double flap dust valve
US5388622A (en) * 1993-11-03 1995-02-14 Ebw, Inc. Automatic shutoff valve
US6959690B1 (en) * 2004-08-27 2005-11-01 Harlie David Reynard Four quarter butterfly valve system
US20090235905A1 (en) * 2007-09-25 2009-09-24 Mann+Hummel Gmbh Device for swirling and mixing exhaust gases recycled in the intake duct of an internal combustion engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8713583U1 (de) * 1987-10-09 1989-02-09 Thyssen Industrie Ag, 4300 Essen Venturikühler für eine Rauchgasentschwefelungsvorrichtung

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1357440A (en) * 1919-11-20 1920-11-02 Morgan Smith S Co Wicket-gate for water-wheels
US1543637A (en) * 1923-04-05 1925-06-23 John M Woll Device for controlling the flow of wells
US2067120A (en) * 1936-03-17 1937-01-05 Myrtle B George Rhythmic inhaler
US3160385A (en) * 1961-09-21 1964-12-08 Greenawalt Sintering Co Inc Suction valve for sintering machine
US3378226A (en) * 1963-11-13 1968-04-16 Charles H. Naundorf High pressure fluid flow measurement and/or control
US3444669A (en) * 1964-06-23 1969-05-20 Ajem Lab Inc High capacity gas washer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1357440A (en) * 1919-11-20 1920-11-02 Morgan Smith S Co Wicket-gate for water-wheels
US1543637A (en) * 1923-04-05 1925-06-23 John M Woll Device for controlling the flow of wells
US2067120A (en) * 1936-03-17 1937-01-05 Myrtle B George Rhythmic inhaler
US3160385A (en) * 1961-09-21 1964-12-08 Greenawalt Sintering Co Inc Suction valve for sintering machine
US3378226A (en) * 1963-11-13 1968-04-16 Charles H. Naundorf High pressure fluid flow measurement and/or control
US3444669A (en) * 1964-06-23 1969-05-20 Ajem Lab Inc High capacity gas washer

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007025A (en) * 1973-11-06 1977-02-08 Gottfried Bischoff Bau Kompl. Apparatus for cleaning stack gas and using same for generation of electric power
US4300749A (en) * 1979-12-13 1981-11-17 Allis-Chalmers Corporation Throttle valve
US5241989A (en) * 1986-05-30 1993-09-07 Plattco Corporation Reduced height double flap dust valve
US5010915A (en) * 1990-06-06 1991-04-30 Ebw, Inc. Two stage automatic shut off valve
US5095937A (en) * 1990-06-06 1992-03-17 Ebw, Inc. Two stage automatic shut off valve
US5141019A (en) * 1990-06-06 1992-08-25 Ebw, Inc. Two stage automatic shutoff valve
US5388622A (en) * 1993-11-03 1995-02-14 Ebw, Inc. Automatic shutoff valve
US6959690B1 (en) * 2004-08-27 2005-11-01 Harlie David Reynard Four quarter butterfly valve system
US20090235905A1 (en) * 2007-09-25 2009-09-24 Mann+Hummel Gmbh Device for swirling and mixing exhaust gases recycled in the intake duct of an internal combustion engine

Also Published As

Publication number Publication date
FR2146280A1 (OSRAM) 1973-03-02
DE2135840A1 (de) 1973-02-08
FR2146280B1 (OSRAM) 1977-04-01

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