EP0579987B1 - Drehrohrofen - Google Patents

Drehrohrofen Download PDF

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Publication number
EP0579987B1
EP0579987B1 EP93110401A EP93110401A EP0579987B1 EP 0579987 B1 EP0579987 B1 EP 0579987B1 EP 93110401 A EP93110401 A EP 93110401A EP 93110401 A EP93110401 A EP 93110401A EP 0579987 B1 EP0579987 B1 EP 0579987B1
Authority
EP
European Patent Office
Prior art keywords
rotary kiln
primary
air nozzles
rotating cylinder
combustion chamber
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
EP93110401A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0579987A1 (de
Inventor
Dieter Prof. Dr.-Ing. Wurz
Arvid Christmann
Gebhard Dr.-Ing. Schetter
Wilfried Schings
Dietmar Dr.-Ing. Schneider
Rüdiger Trumpf
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.)
Deutsche Babcock Anlagen AG
Original Assignee
Deutsche Babcock Anlagen 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 Deutsche Babcock Anlagen AG filed Critical Deutsche Babcock Anlagen AG
Publication of EP0579987A1 publication Critical patent/EP0579987A1/de
Application granted granted Critical
Publication of EP0579987B1 publication Critical patent/EP0579987B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/36—Arrangements of air or gas supply devices
    • F27B7/362—Introducing gas into the drum axially or through the wall
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
    • F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/20—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having rotating or oscillating drums

Definitions

  • Hazardous waste is preferably incinerated in rotary kilns.
  • the combustion gases from the rotary kiln are introduced into an afterburning chamber, where they have to remain at a certain temperature level for a minimum period in accordance with legal requirements.
  • Figures 1 and 2 show in a schematic longitudinal section and in a cross section along the line II-II in Figure 1 an example of such an incinerator according to the prior art (see also document EP-A-0 353 491).
  • Solid and pasty waste is fed in via an inlet chute 2 or in containers on the fixed end face 4 of the rotary kiln 1 via the inlet cross section 3. Liquid residues are also supplied via this end face 4. Liquid residues with a higher calorific value and contaminated waste water are also injected into an afterburning chamber 6. Reliable atomization into droplets that are as small as possible is of great importance here, so that significant portions of the residence time in the afterburning chamber are not used for the process of droplet evaporation.
  • the quantity and type of supply of the combustion air are of considerable importance for the combustion process in the rotary kiln 1. So far, the combustion air has been introduced into the rotary tube 8 of the rotary tube furnace 1 via the inlet chute 2 for the solid fuel or via a nozzle system.
  • the flow rate of the primary air that has entered through the inlet chute 2 is relatively low, so that only little energy is available for increasing the turbulence.
  • the flow impulse of the two types of primary air introduction has a strong component in the direction of the rotary tube axis A, so that partial quantities of the flue gases can pass through the rotary tube relatively quickly, even if a low-pulse return flow region is generated in the region of the rotary tube furnace near the end wall.
  • the object of the invention is to ensure that the residues are burned as far as possible both in the gas phase and in the fuel bed.
  • the invention thus proposes a new type of primary air supply. While previously the primary air supply counteracted natural convection in the rotary tube, the new type of primary air supply according to the invention fanned natural, that is, thermally induced convection.
  • FIGS. 3 to 5 The same parts are identified in FIGS. 3 to 5 with the same reference numerals as in FIGS. 1 and 2.
  • FIGS. 3 and 4 The flow field is shown in FIGS. 3 and 4, as is obtained by looking into the clockwise rotating (arrow f) rotary tube 8 through a transparent end wall 4 which does not rotate with the rotary tube 8. At least two, and at most eight primary air nozzles 20, 22 penetrate the upper region of the end wall 4 at an angle ⁇ . When viewed from the front wall 4 (FIG.
  • the primary air is blown in substantially tangentially to a circle around the rotary tube axis (A) through the primary air nozzles 20, 22 (that is, not here via the inlet chute 2), so that two opposite vortices 24 , 26 are generated with axes of rotation 25, 27 and directions of rotation parallel to the axis of the rotary tube (A), which leads to a central ascending current in the same direction as the thermally induced movement of the fuel gases (double arrow T, F).
  • the primary air heats up on its way to the fuel bed 10 by admixing recirculating combustion gases (FIG. 4), and ignites the fire from both sides of the fuel bed 10.
  • the steepness or slope of the vortex spiral can be adjusted to the requirements of the respective fuel bed 10, such as the local oxygen demand.
  • each of the two to eight primary air nozzles 20, 22 with an adjustable swirl generator (adjustable swirl guide grill). While an unswirled primary air jet remains comparatively well focused and penetrates the fuel bed 10 with considerable momentum, which can be accompanied by an increased flying sparks, a primary air jet will weaken with increasing self-twist due to the addition of combustion gas.
  • a mixed operation can also be advantageous, in which a certain percentage of the primary air is introduced into the rotary tube 1 as before via the solid fuel feed (inlet chute 2 according to FIG. 1). This applies in particular to avoiding the entry of whirled up particles into the inlet chute 2.
  • the "double swirl system" constructed as described according to the invention also has a relevant swirl in the end of the rotary tube at the rotary tube outlet 9, it makes sense to use the movement variable contained in this vortex system for mixing processes in the afterburning chamber 6.
  • the burners or mixed air nozzles 30, 32, 33 used at the transition from rotary kiln 1 to afterburner chamber 6 or in afterburner chamber 6 are arranged in such a way that with them the already existing tendency to mix through those emerging from rotary kiln 1 Double vortex 24, 26 is reinforced so that opposing vortex 34, 36 are also present in the afterburning chamber 6.
  • burners and mixed air nozzles 30, 32, 33 in the afterburning chamber 6 it is crucial not to make the individual pulse sources too weak.
  • the number of burners or mixed air nozzles must therefore not be too large.
  • An arrangement of at least three burners according to FIG. 5 or vice versa should be the preferred configuration, that is, with only one central burner 33 on the rotary tube side and two burners 30, 33 on the side away from the rotary tube (wall 7) of the afterburning chamber 6, have proven their worth.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Incineration Of Waste (AREA)
EP93110401A 1992-07-24 1993-06-30 Drehrohrofen Expired - Lifetime EP0579987B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4224571A DE4224571C2 (de) 1992-07-24 1992-07-24 Drehrohrofen
DE4224571 1992-07-24

Publications (2)

Publication Number Publication Date
EP0579987A1 EP0579987A1 (de) 1994-01-26
EP0579987B1 true EP0579987B1 (de) 1995-09-13

Family

ID=6464061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93110401A Expired - Lifetime EP0579987B1 (de) 1992-07-24 1993-06-30 Drehrohrofen

Country Status (5)

Country Link
US (1) US5286200A (da)
EP (1) EP0579987B1 (da)
DE (2) DE4224571C2 (da)
DK (1) DK0579987T3 (da)
ES (1) ES2078089T3 (da)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5632616A (en) * 1994-11-28 1997-05-27 Cadence Environmental Energy, Inc. Method and apparatus for injecting air into long cement kilns
EP0741267B1 (de) * 1995-05-05 2001-08-01 BBP Environment GmbH Verfahren und Feuerung zum Verbrennen von Abfällen
DE19650785C2 (de) * 1996-12-06 1998-12-24 Steinmueller Gmbh L & C Verfahren zum Verbrennen von Brenngut in einem Drehrohrofen und Drehrohrofen zur Durchführung des Verfahrens
DE10036410B4 (de) * 2000-07-26 2013-07-25 Basf Se Verfahren und Vorrichtung zum Ausbrand von Gut in einem Drehrohrofen
US6672865B2 (en) * 2000-09-11 2004-01-06 Cadence Enviromental Energy, Inc. Method of mixing high temperature gases in mineral processing kilns
US7229281B2 (en) * 2000-09-11 2007-06-12 Cadence Environmental Energy, Inc. Method of mixing high temperature gases in mineral processing kilns
CA2445818C (en) * 2003-07-04 2009-12-22 Holcim Ltd. Method and system for process gas entrainment and mixing in a kiln system
DE102005008893B4 (de) * 2005-02-26 2007-04-19 Forschungszentrum Karlsruhe Gmbh Verfahren zur Erhöhung des Gebindedurchsatzes in Drehrohranlagen
ES2323485B1 (es) * 2008-01-15 2010-04-21 Antonio Garcia Gonzalez Metodo para el tratamiento integral de desechos industriales.
CN109341330B (zh) * 2018-11-29 2024-02-13 扬州市银焰机械有限公司 一种回转窑燃烧器智能控制系统

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1526057A1 (de) * 1965-05-14 1969-06-26 Bremer Gmbh Mitdrehende Brenner und Luftduesen an Drehtrommeloefene fuer Abfallverbrennung
US3360250A (en) * 1965-08-26 1967-12-26 Basf Ag Multiple-chamber rotary kiln
DE2709671C3 (de) * 1977-03-05 1981-11-12 Chadwell Newport Beach Calif. O'Connor Drehrohrofen zur pyrolythischen Zersetzung von Stoffen
US4288215A (en) * 1979-11-05 1981-09-08 Caterpillar Tractor Co. Method and apparatus for preheating a rotatable fluidizable bed
GB2130696B (en) * 1982-11-16 1986-04-16 Nd Engineering Limited Improved rotary high temperature reactor
US4934931A (en) * 1987-06-05 1990-06-19 Angelo Ii James F Cyclonic combustion device with sorbent injection
US4859177A (en) * 1988-02-16 1989-08-22 Fuller Company Apparatus for incinerating combustible material
CH679328A5 (da) * 1988-07-29 1992-01-31 W & E Umwelttechnik Ag
DE3826894A1 (de) * 1988-08-08 1990-02-15 Harald Gebhard Boehler Drehrohrofen mit sektionaler verbrennungsluftzufuhr
US5005493A (en) * 1989-11-08 1991-04-09 American Combustion, Inc. Hazardous waste multi-sectional rotary kiln incinerator
US5199357A (en) * 1991-03-25 1993-04-06 Foster Wheeler Energy Corporation Furnace firing apparatus and method for burning low volatile fuel

Also Published As

Publication number Publication date
DE4224571C2 (de) 1994-06-16
US5286200A (en) 1994-02-15
DK0579987T3 (da) 1996-02-05
DE4224571A1 (de) 1994-01-27
EP0579987A1 (de) 1994-01-26
DE59300585D1 (de) 1995-10-19
ES2078089T3 (es) 1995-12-01

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