EP0075118B1 - Dispositif d'introduction de matiéres fines dans une zone de cuisson - Google Patents

Dispositif d'introduction de matiéres fines dans une zone de cuisson Download PDF

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Publication number
EP0075118B1
EP0075118B1 EP82107649A EP82107649A EP0075118B1 EP 0075118 B1 EP0075118 B1 EP 0075118B1 EP 82107649 A EP82107649 A EP 82107649A EP 82107649 A EP82107649 A EP 82107649A EP 0075118 B1 EP0075118 B1 EP 0075118B1
Authority
EP
European Patent Office
Prior art keywords
duct
air duct
nozzle
air
section
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
Application number
EP82107649A
Other languages
German (de)
English (en)
Other versions
EP0075118A1 (fr
Inventor
Otto Ing. Grad. Heinemann
Heinz-Dieter Ing. Grad. Baldus
Heinz-Herbert Ing. Grad. Schmits
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius 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 Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0075118A1 publication Critical patent/EP0075118A1/fr
Application granted granted Critical
Publication of EP0075118B1 publication Critical patent/EP0075118B1/fr
Expired 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit

Definitions

  • the invention relates to a device according to the preamble of claim 1.
  • a device of this type is known from EP-A-0 002 054.
  • the downward sloping part of the air line is designed as a simple cylindrical tube.
  • the prior art also includes a device for introducing fine-grained solids into an air stream (US Pat. No. 3,245,725), in which a streamlined installation body is provided in the air line, narrowing the air passage cross section, through which the solid enters the air stream is introduced.
  • the invention has for its object to provide a device of the type mentioned in the preamble of claim 1 so that the fines on the short distance available (between the confluence of the pipe and the combustion zone) is triggered properly and reliably introduced into the combustion zone.
  • the increased flow rate still prevailing at this point can also be used for the entry of the fuel.
  • the arrangement of the burner at this point also ensures that the entire length of the diffuser can be used to dissolve the fuel in the fine-air mixture.
  • a combustion zone 1 is formed by the exhaust pipe 2 of a rotary kiln (not shown).
  • the exhaust gas from this rotary kiln flows to the combustion zone 1 from below (arrow 3) and, after passing through the combustion zone 1, reaches the bottom stage of a (also not shown) multi-stage cyclone preheater (arrow 4).
  • Two lines 5, 5 ′ which are two partial lines of an air line and which are connected to a cooler connected downstream of the rotary kiln and feed the exhaust air of this cooler as so-called tertiary air to the combustion zone 1, open into the exhaust gas line 2 at approximately opposite circumferential locations.
  • the system described so far can be used in particular for the precalcination of preheated cement raw material, as is explained in detail in DE-OS 27 52 323.5.
  • the raw material preheated in the cyclone preheater is heated and largely calcined in the combustion zone 1 by the hot furnace exhaust gases and by the fuel additionally introduced via the burners 9, 9 'before it is discharged in the bottom stage of the cyclone preheater separated and fed to the rotary kiln for final firing.
  • the air lines 5, 5 'in the region of the confluence of the good line 6, 6' have a nozzle-like constriction which increases the flow velocity and which in this exemplary embodiment (FIG. 1) is in the form of a Venturi tube. Since both parts of the system arranged in mirror image are of the same design, the description of the Venturi pipe belonging to the line suffices below.
  • the venturi tube contains an inflow cone 10, a nozzle part 11 of a narrow cross section and a diffuser 12.
  • the burner 9 is arranged in the first region of the nozzle part 11 of a narrow cross section, for example in the zone of the wall of the venturi tube opposite the gutter line 6 .
  • the longitudinal axis 13 of the Venturi tube is inclined at an angle a of 20 to 70 ° with respect to the horizontal, while the pipe 6 forms an angle ⁇ of approximately 70 to 20 ° with the longitudinal axis 13 of the Venturi tube in the region of its junction.
  • the venturi tube is provided with a symmetrical inflow cone 10 and a symmetrical diffuser 12.
  • FIGS. 2 and 3 Two variants of the embodiment shown in FIG. 1 (with Venturi tube) are illustrated in FIGS. 2 and 3.
  • the Venturi tube has an asymmetrical inflow cone 10a (with a one-sided opening angle of 10 to 30 °) and a symmetrical diffuser 12a (with a half opening angle of 10 to 30 °).
  • the longitudinal axis 13a of the Venturi tube is here inclined at an angle of approximately 30 ° with respect to the horizontal.
  • the axis 14a of the burner (cf. burner 9 in FIG. 1) runs approximately horizontally.
  • the dimension b corresponds approximately to half the value of d m (diameter of the good line 6a), while the dimension d (cf. FIG. 2) is greater than 0.
  • the good line 6a forms an angle of approximately 60 ° with the longitudinal axis 13a of the venturi tube and thus runs approximately vertically.
  • the venturi tube is provided with an asymmetrical inflow cone 10b (with a one-sided opening angle from 10 to 30 °) and an asymmetrical diffuser 12b (with a one-sided opening angle from 0 to 30 °).
  • the longitudinal axis 13b of the venturi tube is inclined at an angle of 40 to 60 ° with respect to the horizontal in the area of the narrowest nozzle part.
  • the burner axis 14b also runs approximately horizontally here.
  • Gutgut 6b runs approximately vertically and thus opens into the Venturi tube at an angle of 30 to 50 °.
  • the minimum length I of the nozzle part 11 b of the narrowest cross section is approximately three times the value of the diameter d m of the good line 6b.
  • the dimension b corresponds to approximately 1/2 d m .
  • the dimension a is greater than 0.
  • the operating conditions during exemplary embodiment s D iel aezess Fia. 3 can be like folate:
  • the device can have essentially the same basic structure as was explained with reference to FIG. 1. Accordingly, the device contains a combustion zone 21, which is formed by the exhaust line 22 of a rotary kiln, not shown, the exhaust gas of which flows from below into the combustion zone 21 (arrow 23) and, after passing through this combustion zone 21, reaches the bottom stage of the multi-stage cyclone preheater, which is again not shown (Arrow 24). At opposite circumferential points of the exhaust gas line 22, two sub-lines 25, 25 ′ open, which are connected to a cooler connected downstream of the rotary kiln and whose exhaust air leads to the combustion zone 1 as tertiary air.
  • a good line 26, 26 ' (from the second lowest cyclone preheater stage) in turn opens into the lines 25, 25', the good flows through arrows 27, 27 'and the air flow into the Lines 25, 25 'are indicated by the arrows 28, 28'.
  • each air line 25, 25 ' provided in the region of the confluence of the good line 26, 26' is formed by a nozzle 30 with an adjustable double wing plate 31 .
  • the two nozzles 30 are of identical design and are arranged in mirror image to one another, so that the description of the nozzle 30 for the line 25 is sufficient in the following.
  • the nozzle 30 can have a substantially straight piece of pipe, the cross section of which can preferably be rectangular, but possibly also suitably round (circular or elliptical), but otherwise corresponds approximately to the cross-sectional size of the line 25.
  • the approximately vertical gutter 26 is connected to this straight pipe section of the nozzle 30 from above.
  • a diffuser 32 is provided between the end of the nozzle 30 adjacent to the exhaust line 22 and the combustion zone 21 or the exhaust line 22, and can be designed in the same way as is explained with reference to FIGS. 1 to 3; 8, the diffuser 32 is asymmetrical.
  • the flap wings 33 of the double-wing flap 31 lie in approximately vertical planes and can be pivoted about axes 34 which are in the same planes as the flap flaps 33 and run perpendicular to the longitudinal axis 35 of the line 25.
  • This flap wing 33 of the double wing flap 31 can be adjusted synchronously or asynchronously, depending on the need or application, either by hand or - as indicated in the drawing - with the aid of a servomotor 36 which enables automatic control or remote control.
  • the free wing end edges 33a pointing in the direction of air flow extend approximately to the area where the good line 26 opens into the nozzle 30. If one considers the plan projection according to FIG. 9, the free wing end edges 33a of the flap wings 33 are spaced apart A to the point of intersection of the longitudinal axis 26a of the good line with the longitudinal axis 35 of the air line 25, the distance A being a measure which lies between 0 and D, at most corresponding approximately to the clear diameter D of the air line 25.
  • each burner 29, 29 ' is mounted at a point slightly downwards compared to FIG. 1, in the region of the upper end of the diffuser 32 in such a way that the burner axis 29a or 29'a is the lower extension of the Longitudinal axis 35 or 35 'of the associated lines 25, 25' intersects at a point which lies at the junction of the associated air line 25, 25 'in the combustion zone 21 or exhaust gas line 22. It should be emphasized at this point that FIGS.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)

Claims (13)

1. Dispositif de traitement thermique de matière à granulométrie fine, en particulière de matière première pour la fabrication du ciment, comprenant:
a) un réchauffeur à cyclones à plusieurs étages,
b) un four tubulaire rotatif,
c) une canalisation de gaz brûlés (2, 22) menant du four tubulaire à l'étage inférieur du réchauffeur à cyclones et formant une zone de cuisson (1, 21 ) destinée à la précalcination de la matière réchauffée,
d) un réfrigérant monté en aval du four tubulaire,
e) une canalisation d'air (5, 5', 25, 25') menant du réfrigérant à la zone de cuisson (1, 21) et dont la partie débouchant dans la canalisation des gaz brûlés (2, 22) est inclinée vers le bas sur l'horizontale dans le sens de la circulation,
f) une canalisation de produit (6, 6', 26, 26') provenant de l'avant dernier étage inférieur du réchauffeur à cyclones et débouchant dans la circonférence de la partie de la canalisation d'air (5, 5', 25, 25') qui est inclinée vers le bas,
g) un brûleur (9, 9', 29, 29') par lequel arrive un combustible solide, liquide ou gazeux et qui est disposé dans la partie de la canalisation d'air (5, 5', 25, 25') qui est inclinée vers le bas, dispositif caractérisé par les particularités suivantes:
h) la partie de la canalisation d'air (5, 5', 25,25') qui est inclinée vers le bas présente un rétrécissement (11, 30) qui élève la vitesse de circulation de l'air à l'embouchure de la canalisation de matière (6, 6', 26, 26'),
i) la canalisation d'air (5, 5', 25, 25') est conformée en diffuseur (12a, 12b, 32) entre le rétrécissement (1 1, 30) et la canalisation des gaz brûlés (2, 22) qui forme la zone de cuisson (1, 21),
j) le brûleur (9, 9', 29, 29') est disposé dans le rétrécissement (11) ou à l'extrémité supérieure du diffuseur (32).
2. Dispositif selon la revendication 1, caractérisé en ce que la partie de la canalisation d'air (5) qui est inclinée vers le bas comprend un tube de venturi comportant un cône d'entrée (10), un ajutage formant le rétrécissement (11) et un diffuseur (12).
3. Dispositif selon la revendication 2, caractérisé en ce que le tube de venturi présente un cône d'entrée symétrique (10) dont le demi-angle d'ouverture est compris entre 10 et 30°.
4. Dispositif selon la revendication 2, caractérisé en ce que le tube de venturi présente un cône d'entrée asymétrique (1 Oa, 1 Ob) dont l'angle d'ouverture unilatéral est compris entre 10 et 30°.
5. Dispositif selon la revendication 1, caractérisé en ce que le rétrécissement de la canalisation d'air (25) est formé d'un ajutage (30) dans lequel est incorporé un clapet réglable (31) à deux ailes.
6. Dispositif selon la revendication 1, caractérisé par un diffuseur symétrique (12a) dont le demi-angle d'ouverture est compris entre 10 et 30°.
7. Dispositif selon la revendication 1, caractérisé par un diffuseur asymétrique ( 12b) dont l'angle d'ouverture unilatéral est compris entre 0 et 30°.
8. Dispositif selon la revendication 2, caractérisé en ce que le tube de venturi a une section circulaire, une section en secteur de cercle à fond plat, une section elliptique, une section elliptique tronquée à fond plat, une section rectangulaire ou une section prismatique.
9. Dispositif selon la revendication 1, caractérisé en ce que l'axe de symétrie longitudinal du rétrécissement est incliné sur l'horizontale d'un angle de 20 à 70° et la canalisation de matière forme à son embouchure un angle compris entre 70 et 20° avec l'axe de symétrie longitudinal du rétrécissement.
10. Dispositif selon la revendication 5, caractérisé en ce que l'ajutage formant un rétrécissement (30) comprend un tronçon tubulaire sensiblement rectiligne de section rectangulaire ou circulaire et le bord extrême libre (33a) des ailes du clapet double (31) qui est tourné dans le sens de la circulation de l'air (28) atteint le voisinage de l'embouchure de la canalisation de matière (26) dans l'ajutage.
11. Dispositif selon la revendication 10, caractérisé en ce que la distance A - vue en projection en plan - entre le point d'intersection de l'axe de symétrie longitudinal (26a) de la canalisation de matière et de l'axe de symétrie longitudinal (35) de la canalisation d'air et le bord extrême libre (33a) des ailes du clapet double (31 ) qui est tourné dans le sens de la circulation de l'air (28) correspond au maximum approximativement au diamètre D de la canalisation d'air (25).
12. Dispositif selon la revendication 2, caractérisé en ce que le brûleur (9) est disposé au début de l'ajutage formant le rétrécissement (11 ) et de préférence dans la zone de la paroi du tube de venturi qui est située en face de l'embouchure de la canalisation de matière (6).
13. Dispositif selon la revendication 1, caractérisé par un dimensionnement de la canalisation d'air (5) tel que la vitesse de circulaire de l'air soit de 20 à 40 m/s au voisinage du rétrécissement en forme de tuyère.
EP82107649A 1981-09-16 1982-08-20 Dispositif d'introduction de matiéres fines dans une zone de cuisson Expired EP0075118B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3136766 1981-09-16
DE3136766 1981-09-16
DE19813147374 DE3147374A1 (de) 1981-09-16 1981-11-30 "vorrichtung zur einfuehrung von feingut in eine brennzone"
DE3147374 1981-11-30

Publications (2)

Publication Number Publication Date
EP0075118A1 EP0075118A1 (fr) 1983-03-30
EP0075118B1 true EP0075118B1 (fr) 1985-11-06

Family

ID=25796062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82107649A Expired EP0075118B1 (fr) 1981-09-16 1982-08-20 Dispositif d'introduction de matiéres fines dans une zone de cuisson

Country Status (6)

Country Link
US (1) US4464112A (fr)
EP (1) EP0075118B1 (fr)
BR (1) BR8205409A (fr)
DE (2) DE3147374A1 (fr)
ES (1) ES515742A0 (fr)
GR (1) GR78051B (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3436687A1 (de) * 1984-10-05 1986-04-10 Krupp Polysius Ag, 4720 Beckum Vorrichtung zur waermebehandlung von feingut
DE3442806A1 (de) * 1984-11-23 1986-06-05 Krupp Polysius Ag, 4720 Beckum Vorrichtung zum waermetausch zwischen gas und feinkoernigem gut
DE19917310A1 (de) * 1999-04-16 2000-10-19 Krupp Polysius Ag Vorrichtung zur thermischen Behandlung von Material
US6696116B2 (en) * 1999-10-26 2004-02-24 Cary Bigman Device and method for flowing pellets
DE10155407B4 (de) * 2001-11-10 2010-02-18 Khd Humboldt Wedag Gmbh Verfahren und Einrichtung zur Einführung von festem, flugfähigem Brennstoff in den Calcinator einer Zementproduktionslinie
WO2015159572A1 (fr) * 2014-04-14 2015-10-22 太平洋エンジニアリング株式会社 Dispositif de dispersion de corps granulaire
CN111349469B (zh) * 2018-12-24 2021-04-23 国家能源投资集团有限责任公司 烧嘴、供料装置、气化炉和气化系统
CN111349470B (zh) * 2018-12-24 2021-04-13 国家能源投资集团有限责任公司 烧嘴和具有该烧嘴的气化炉

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH83684A (fr) * 1918-12-07 1920-01-16 Henri Quiby Procédé pour la production continue de réactions chimiques entre corps solides en fines particules et corps fluides
FR524611A (fr) * 1920-03-24 1921-09-08 Charles Candlot Perfectionnements aux fours rotatifs
US3245725A (en) * 1963-11-07 1966-04-12 Phillips Petroleum Co Solids handling
FR1491215A (fr) * 1965-09-21 1967-08-11 Bertin & Cie Perfectionnements aux éjecteurs-mélangerus ou trompes
JPS5347497Y2 (fr) * 1974-02-19 1978-11-14
GB1506733A (en) * 1974-03-29 1978-04-12 Lafarge Sa Method of treating raw material for producing cement
DE2752323A1 (de) * 1977-11-23 1979-06-07 Polysius Ag Verfahren und anlage zur waermebehandlung von feinkoernigem gut
US4310299A (en) * 1980-05-05 1982-01-12 Coen Company, Inc. Method for firing a rotary kiln with pulverized solid fuel

Also Published As

Publication number Publication date
ES8306404A1 (es) 1983-06-01
BR8205409A (pt) 1983-08-23
ES515742A0 (es) 1983-06-01
DE3267302D1 (en) 1985-12-12
US4464112A (en) 1984-08-07
DE3147374A1 (de) 1983-03-24
EP0075118A1 (fr) 1983-03-30
GR78051B (fr) 1984-09-26

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