EP0628768B1 - Drehofenbrenner - Google Patents

Drehofenbrenner Download PDF

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Publication number
EP0628768B1
EP0628768B1 EP19940107023 EP94107023A EP0628768B1 EP 0628768 B1 EP0628768 B1 EP 0628768B1 EP 19940107023 EP19940107023 EP 19940107023 EP 94107023 A EP94107023 A EP 94107023A EP 0628768 B1 EP0628768 B1 EP 0628768B1
Authority
EP
European Patent Office
Prior art keywords
burner
jet air
nozzle
ring
annular
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
EP19940107023
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0628768A1 (de
Inventor
Wolfgang Breidenstein
Ralf Filges
Norbert Schön
Ernst Schröder
Jürgen Wutschke
Manfred Korten
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.)
Deutz AG
Original Assignee
Kloeckner Humboldt Deutz 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 Kloeckner Humboldt Deutz AG filed Critical Kloeckner Humboldt Deutz AG
Publication of EP0628768A1 publication Critical patent/EP0628768A1/de
Application granted granted Critical
Publication of EP0628768B1 publication Critical patent/EP0628768B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D1/00—Burners for combustion of pulverulent fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/00018—Means for protecting parts of the burner, e.g. ceramic lining outside of the flame tube

Definitions

  • the invention relates to a burner for a rotary kiln, with an annularly arranged channel for the pneumatic transport of fine-grained solid fuel (coal dust) and with at least one concentrically arranged further channel, at the mouth of which an annular nozzle disk is fastened with a plurality of nozzles distributed around the circumference, through which primary air exits at increased speed.
  • Rotary kiln burners of this type are usually designed as so-called three-channel burners (US Pat. No. 4,428,727), ie the pneumatically transported coal dust flows through the central burner channel and it exits through an annular gap nozzle, the coal dust flowing out being surrounded by radially inner as well as radially outer primary air.
  • the radially outer primary air also known as jet air, is divided by means of a plurality of individual nozzles arranged in the annular jet air duct into many individual high-speed primary air jets which create a negative pressure area in their environment, i.e.
  • the many high-speed primary air jets serve as propulsion jets according to the injector principle , through which the large mass of the practically still hot secondary air surrounding the rotary kiln burner is sucked in from approx. 800 ° C inwards towards the core of the burner flame, where the hot secondary air is intensively mixed with the coal dust escaping through the annular gap nozzle this way burns quickly and completely to form a short hot flame, as is required in the sintering zone of a rotary kiln for sintering the calcined cement raw material to cement clinker.
  • hot secondary air e.g. approx. 95% by volume
  • the jet air nozzles are fastened in an annular nozzle disk which is welded to the end opening of the outer burner support tube (jet air tube).
  • Replacing such a nozzle disk is time-consuming inasmuch as the front area of the refractory jacket of the burner and part of the burner support tube have to be removed, and after replacing the nozzle disk the refractory jacket to be applied must dry out well before the burner is put back into operation.
  • the radially inner end face of the nozzle disk must be securely sealed against the annularly shaped coal dust nozzle of the coal dust duct so that the functionality of the burner is not endangered.
  • the invention has for its object to provide a rotary kiln of the type mentioned, with a jet disk closing the jet disc, which is easy to replace without destroying / renewing the refractory material of the burner support tube and whose jet air nozzles are conveniently and reliably adjustable or replaceable.
  • the ring-shaped nozzle disc that closes the jet air duct with the jet air nozzles is not directly on the burner support tube (jet air tube), for. B. attached by welding, but the nozzle disc is fitted leaving the end-face annular expansion joints in the jet air duct and releasably and interchangeably attached to spacers accessible from the burner mouth front, which are fastened to maintain the concentricity of the jet air pipe and fuel pipe in the jet air duct.
  • the spacers between the jet air pipe and the fuel pipe can consist of a one-part or multi-part ring which is arranged in the jet air duct as seen from the burner mouth at a distance behind the nozzle disk.
  • the spacer ring has a plurality of openings, windows etc. distributed around the circumference for the passage of the jet air flow to the nozzles of the nozzle disk.
  • the nozzle disk can be pressed against the spacer ring via a radially inner sealing ring and via a radially outer sealing ring, and the fastening means for releasably fastening the nozzle disk ring to the spacer ring and for tightening the seals are screw bolts distributed around the circumference of the ring, the axes of which are parallel to the burner axis lie. Jet bolts flow around the bolts and their threads so that they can withstand thermal loads.
  • the nozzle disk can be easily detached from the spacer ring and thus the nozzle disk can be replaced quickly and easily, without having to destroy / replace the refractory casing of the burner support tube.
  • the sealing rings between the nozzle disk and the spacer ring the jet air of the jet air duct is prevented from emerging radially or laterally from the air duct in an undesirable manner.
  • the nozzles of the ring-shaped nozzle disk consist of cylindrical nozzle bodies which can be rotated without threads in corresponding bores arranged over the circumference of the nozzle disk, but can each be axially fixed by means of a circumferential ring groove.
  • the jet air nozzles can be safely installed in the nozzle disc from the front of the burner and also interchangeable and rotatable into the desired position in order to be able to set a specific deflection angle or divergence angle of the jet air jets with respect to the longitudinal axis of the burner, possibly with a swirl flow component superimposed.
  • the rotary kiln burner of FIG. 1 has an annular channel (10) for the pneumatic transport of fine-grained coal dust, enclosed by the fuel pipe (11).
  • the coal dust primary air suspension (12) occurs at a speed of z. B. 28 m / s from an annular gap nozzle (13), which diverges with a small angle to the outside.
  • a ring channel (14) is arranged concentrically around the coal dust channel (10), through which primary air flows, which flows at high speed, e.g. B. 140 to 420 m / s in the form of jet streams (15) emerges from individual burner nozzles (16) distributed around the circumference of the burner mouth.
  • the primary air flowing in the ring channel (14), encompassed by the burner support tube (17), is also called jet air.
  • the high-speed jet air jets (15) or high-speed driving jets are able to remove as much hot secondary air (18) as possible from the rotary kiln burner.
  • the rotary kiln burner is protected against thermal overload by a casing (19) made of refractory material, only shown in the upper half of the drawing in FIG. 1.
  • a further primary air duct (20) can be arranged concentrically within the coal dust duct (10) and can be equipped with a swirl generator (21) at its mouth. In the center of the burner there is also a tube (22) into which a central pilot burner can be inserted.
  • the distributed around the circumference jet air nozzles (16) are arranged in an annular nozzle disc (23) which is not welded to the burner orifice on the support tube (17), but which is fitted into the annular jet air duct (14) while leaving gap-shaped expansion joints at the front and over Fastening means accessible from the front of the burner orifice, in FIG. 1 releasably and interchangeably fastened via the screw bolts (24) to spacers which are fastened in the jet air duct (14) in order to maintain the concentricity of the burner support tube (17) or jet air tube and fuel tube (11) .
  • FIGS. 1 According to the exemplary embodiments in FIGS.
  • the spacers between the jet air pipe (17) and the fuel pipe (11) consist of a two-part or three-part ring (26) screwed together with screws (25), which is seen in the jet air duct (14) from the combustion mouth is arranged a short distance behind the nozzle disk (23).
  • the heads of the screw bolts (24) which are located in the burner area cooled by the jet air, are protected in the recesses in the end face of the nozzle disk (23).
  • the nozzle disk (23) can be pressed against the spacer ring (26) via a radially inner sealing ring (27) and via a radially outer sealing ring (28), so that a perfect one Sealing of the jet air duct (14) is guaranteed.
  • the spacer ring (26) z. B. in circumferential areas between the bolts (24) has a plurality of openings or windows (29) etc. distributed around the circumference for the passage of the jet air flow to the nozzles (16) of the nozzle disk (23).
  • the jet air nozzles (16) of the annular nozzle disk (23) consist of cylindrical nozzle bodies which can be rotated without threads in corresponding bores arranged around the circumference of the nozzle disk, but can be axially fixed by inserting a pin by means of a circumferential annular groove (30). To remove a jet air nozzle (16), it is rotated until a longitudinal groove (31) reaches the area of the holding pin, after which the nozzle (16) can be pulled outwards. Depending on the rotational position of the jet air nozzle (16), the nozzle bore (32) can be changed with regard to its divergence from the longitudinal axis of the burner and, if applicable, its swirl flow component.
  • the rotatable jet air nozzle (16) with circumferential ring groove (30) can be fixed via a pin (33) which is accessible from the burner mouth and whose axis is parallel to the longitudinal axis of the burner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Pre-Mixing And Non-Premixing Gas Burner (AREA)
EP19940107023 1993-06-11 1994-05-05 Drehofenbrenner Expired - Lifetime EP0628768B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19934319363 DE4319363A1 (de) 1993-06-11 1993-06-11 Drehofenbrenner
DE4319363 1993-06-11

Publications (2)

Publication Number Publication Date
EP0628768A1 EP0628768A1 (de) 1994-12-14
EP0628768B1 true EP0628768B1 (de) 1997-03-05

Family

ID=6490117

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940107023 Expired - Lifetime EP0628768B1 (de) 1993-06-11 1994-05-05 Drehofenbrenner

Country Status (3)

Country Link
EP (1) EP0628768B1 (da)
DE (2) DE4319363A1 (da)
DK (1) DK0628768T3 (da)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19925875A1 (de) 1999-06-07 2000-12-14 Krupp Polysius Ag Rohrförmiger Brenner für Industrieöfen
AT411928B (de) * 2001-12-21 2004-07-26 Unitherm Cemcon Feuerungsanlag Brenner, insbesondere für drehrohröfen
DE102004010063A1 (de) * 2004-03-02 2005-09-22 Khd Humboldt Wedag Ag Drehofenbrenner
DE102005029317A1 (de) * 2005-06-22 2006-12-28 Linde Ag Vorrichtung zum Einleiten von Stoffen in einen Reaktionsraum
DE102005053819A1 (de) 2005-11-11 2007-05-16 Khd Humboldt Wedag Gmbh Drehofenbrenner
DE102006060867B4 (de) 2006-12-22 2020-07-02 Khd Humboldt Wedag Gmbh Drehofenbrenner

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1808120A (en) * 1929-08-09 1931-06-02 Fried Krupp Germaniawerft Ag Pulverized fuel furnace
DE3027587A1 (de) * 1980-07-21 1982-02-25 Klöckner-Humboldt-Deutz AG, 5000 Köln Brenner fuer feste brennstoffe
DE3541616A1 (de) * 1985-11-25 1987-05-27 Krupp Polysius Ag Brenner fuer pulverfoermigen brennstoff
JPS6338807A (ja) * 1986-08-04 1988-02-19 Mitsubishi Mining & Cement Co Ltd 微粉末固体燃料燃焼バ−ナ

Also Published As

Publication number Publication date
DE4319363A1 (de) 1994-12-15
EP0628768A1 (de) 1994-12-14
DK0628768T3 (da) 1997-04-01
DE59401881D1 (de) 1997-04-10

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