EP0289965A2 - Vorrichtung zur Änderung der Querschnittsfläche einer pneumatischen Förderleitung und Anwendung zur Einspritzung von festen Brennstoffen in einen Schachtofen - Google Patents

Vorrichtung zur Änderung der Querschnittsfläche einer pneumatischen Förderleitung und Anwendung zur Einspritzung von festen Brennstoffen in einen Schachtofen Download PDF

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Publication number
EP0289965A2
EP0289965A2 EP88106959A EP88106959A EP0289965A2 EP 0289965 A2 EP0289965 A2 EP 0289965A2 EP 88106959 A EP88106959 A EP 88106959A EP 88106959 A EP88106959 A EP 88106959A EP 0289965 A2 EP0289965 A2 EP 0289965A2
Authority
EP
European Patent Office
Prior art keywords
section
groove
pipe
cylinder
bead
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.)
Withdrawn
Application number
EP88106959A
Other languages
English (en)
French (fr)
Other versions
EP0289965A3 (de
Inventor
Louis Schmit
Radomir Andonov
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.)
Paul Wurth SA
Original Assignee
Paul Wurth SA
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 Paul Wurth SA filed Critical Paul Wurth SA
Publication of EP0289965A2 publication Critical patent/EP0289965A2/de
Publication of EP0289965A3 publication Critical patent/EP0289965A3/de
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/02—Pneumatic feeding arrangements, i.e. by air blast

Definitions

  • the present invention relates to a device for modifying the cross section of a pneumatic transport pipe and the application of such a device to the injection of solid fuels into a tank furnace, in particular a blast furnace.
  • Devices of this kind are not only used to modify the flow rate in a pneumatic conveying line, but also to provide a section with variable throttling in order to accelerate the mixture of fuels, in particular coal dust, and propulsion.
  • Known devices generally comprise a slot in a mobile element which overlaps, by displacement of the latter, on a slot of a fixed element, in order to define a variable opening.
  • the variation in section is very abrupt, especially in the case of small openings, which is the source of risks of obstruction and abrasion of the closed part of the passage.
  • the object of the present invention is to provide a new device for modifying the cross-section of a pneumatic pulverulent material transport pipe, which allows a progressive modification, by throttling, of a section of the pipe, and in which the risk less wear and plug formation.
  • the present invention provides a device for modifying the cross section of a pneumatic conveying line for pulverulent materials, which, in a first embodiment, is essentially characterized by a cylinder rotatably mounted in a block of support which is crossed tangentially with respect to the cylinder by said pipe, and in that the cylinder has, at the level of said pipe, at least a first peri-groove the depth of which varies between a minimum and a maximum which corresponds to the diameter of the pipe at the point where it is tangential to the cylinder.
  • the width of the groove can be equal to the width of the pipe.
  • the cylinder has a second peripheral groove which opens into the first groove and whose width is less than that of the first groove, this second groove extending from the place where the first groove reaches its depth. maximum beyond the point where this first groove ends.
  • the bottom of the first and second grooves may be at a right angle or rounded, the radius of curvature then being equal to half the width of the pipe.
  • the section of the pipe when passing through the block is preferably rectangular, and corresponds to the maximum section of said first groove.
  • the section of the pipe is circular and the cylinder has, at this pipe, a peripheral bead whose section corresponds to half of the section of the pipe and is provided, at said bead, an elongated peripheral notch of circular section gradually increasing from a minimum to a maximum corresponding to the reverse of the section of the bead.
  • the pneumatic conveying line preferably has a constriction when passing through the block.
  • the device essentially comprises a cylinder 12 rotatably mounted in a support block 10, tangentially to a passage 14 connected to a pipe 16 in which is transported, pneumatically, coal into dust.
  • the direction of transport is preferably from right to left.
  • the section of the passage 14 is preferably smaller than that of the line 16 in order to cause, in the block 10, an acceleration of the pneumatic mixture.
  • the section of the central portion of the passage 14 has a square or rectangular shape.
  • the cylinder 12 has at least a first peripheral groove 18 which, in the position of FIG. 1, extends along a segment parallel to the vertical axis O. In a first embodiment, this groove 18 has a section such that shown in Figure 3a.
  • the cylinder 12 has, in addition, a second peripheral groove 20 which extends, in the position of FIG. 1, in the third trigonometric quarter and which has the section shown in FIG. 3b, that is to say which is smaller than the groove 18.
  • This groove merges, therefore, in the 180 ° position with the groove 18 and ends in the 270 ° position where the cylinder 12 is in contact with the lower wall of the passage 14. The two grooves are clearly visible in the perspective view of FIG. 3c.
  • the groove 20 has a smaller section, it allows adjustment finer, i.e. for the same angle of rotation of the cylinder 12, the variation in the opening section of the passage is smaller.
  • the groove 20 with a small section could constitute a handicap in the event of the formation of plugs if it is wished to clear the passage using the pressure of the propellant gas. This is the reason why the groove 18 is provided with a large section which allows rapid release by abruptly opening the passage to the maximum section.
  • FIG. 4 differs from that of FIG. 3 only in that the bottom of each of the grooves 18 ′ and 20 ′ is rounded, the radius of curvature being equal to half the width of each of these grooves.
  • the embodiment according to FIG. 5 is slightly different from the embodiments of Figures 3 and 4.
  • the cylinder 12 is provided, on at least part of its periphery, with a bead 22 of circular section whose radius corresponds to the radius of the passage 14. This bead 22 therefore evolves in this passage 14 and obstructs it when it is there.
  • the opening of the passage 14 is produced by a peripheral notch 24 (see FIG. 5) in this bead 22.
  • this notch 24 relative to the outer central part of the bead 22 extends from the zero level progressively until a depth in the cylinder 12 corresponding to the thickness of the bead 22.
  • the bottom of the notch 24 is circular, the radius of curvature corresponding to half its width, the opening produced by rotation of the cylinder 12 remains substantially circular, the maximum opening according to FIG. 5a having a section corresponding exactly to that of the passage 14.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Feeding And Controlling Fuel (AREA)
  • Manufacture Of Iron (AREA)
EP88106959A 1987-05-07 1988-04-30 Vorrichtung zur Änderung der Querschnittsfläche einer pneumatischen Förderleitung und Anwendung zur Einspritzung von festen Brennstoffen in einen Schachtofen Withdrawn EP0289965A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU86870 1987-05-07
LU86870A LU86870A1 (fr) 1987-05-07 1987-05-07 Dispositif de modification de la section d'une conduite de transport pneumatique et application a l'injection de combustibles solides dans un four a cuve

Publications (2)

Publication Number Publication Date
EP0289965A2 true EP0289965A2 (de) 1988-11-09
EP0289965A3 EP0289965A3 (de) 1989-06-28

Family

ID=19730917

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106959A Withdrawn EP0289965A3 (de) 1987-05-07 1988-04-30 Vorrichtung zur Änderung der Querschnittsfläche einer pneumatischen Förderleitung und Anwendung zur Einspritzung von festen Brennstoffen in einen Schachtofen

Country Status (6)

Country Link
EP (1) EP0289965A3 (de)
JP (1) JPS63311018A (de)
AU (1) AU1479588A (de)
BR (1) BR8802363A (de)
LU (1) LU86870A1 (de)
ZA (1) ZA882781B (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE944579C (de) * 1950-05-12 1956-06-21 Steinmueller Gmbh L & C Feuerungsanlage mit Brennstoff-Blasaufgabe
FR2098715A5 (de) * 1970-07-24 1972-03-10 Demurger & Cie Ets
AU6073680A (en) * 1979-08-09 1981-02-12 Bougainville Copper Ltd. Adjustable flow plug valve
AU557972B2 (en) * 1982-11-10 1987-01-15 Paul Wurth S.A. Device to introduce dosed quantities of pulverulent substances into a pneumatic propulsion fluid and use to inject solid fuels into a furnace

Also Published As

Publication number Publication date
ZA882781B (en) 1988-10-20
JPS63311018A (ja) 1988-12-19
AU1479588A (en) 1988-11-10
LU86870A1 (fr) 1989-01-19
BR8802363A (pt) 1988-12-13
EP0289965A3 (de) 1989-06-28

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