EP0789830A1 - Grille coulissante pour refroidisseur de matieres cuites et plaque grillagee utilisee pour former cette grille coulissante - Google Patents

Grille coulissante pour refroidisseur de matieres cuites et plaque grillagee utilisee pour former cette grille coulissante

Info

Publication number
EP0789830A1
EP0789830A1 EP95936572A EP95936572A EP0789830A1 EP 0789830 A1 EP0789830 A1 EP 0789830A1 EP 95936572 A EP95936572 A EP 95936572A EP 95936572 A EP95936572 A EP 95936572A EP 0789830 A1 EP0789830 A1 EP 0789830A1
Authority
EP
European Patent Office
Prior art keywords
sliding
grate
plate
cooling air
cover
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.)
Granted
Application number
EP95936572A
Other languages
German (de)
English (en)
Other versions
EP0789830B1 (fr
Inventor
Theo Fehsenmayr
Reiner FRÜHLING
Frank Heinrich
Hartmut Meyer
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.)
Claudius Peters AG
Original Assignee
Babcock Materials Handling 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 Babcock Materials Handling AG filed Critical Babcock Materials Handling AG
Publication of EP0789830A1 publication Critical patent/EP0789830A1/fr
Application granted granted Critical
Publication of EP0789830B1 publication Critical patent/EP0789830B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • F27D15/0206—Cooling with means to convey the charge
    • F27D15/0213—Cooling with means to convey the charge comprising a cooling grate
    • F27D15/022—Cooling with means to convey the charge comprising a cooling grate grate plates

Definitions

  • Known sliding grates such as those used for cooling cement clinker and other pourable firing material, consist of a plurality of rows of grate plates which run transversely to the longitudinal and feed directions of the cooler and which alternate in a fixed manner and are moved back and forth in the conveying direction are arranged, the grate plates arranged one behind the other overlapping one another in a scale-like manner.
  • the material bed to be cooled moves over the top of the plates and has a wearing effect. It is known (EP-C 337383; EP-A 537523; US-A 5174747) to provide recesses in the top of the plate in the receiving area, over which the bed slides, in which good particles are held and in which cooling air outlet openings open.
  • This arrangement has the advantage that the cooled material held in the recesses protects the area of the grate plate underneath from the thermal and wear-and-tear effect of the material bed sliding over it and that the cooling air is well distributed by the material located in the recesses .
  • the front panel section is particularly prone to wear, it is essentially equipped over its entire width with one or more such recesses.
  • the rear section is less thermally stressed because it is covered to a periodically changing extent by the grate plate arranged behind it. So that this rear plate can slide over it without a substantial distance, the surface of this rear section is generally made more or less smooth and parallel to the direction of the relative movement. It is referred to below as the sliding surface.
  • the known plates equipped in the front section with recesses on the top side have a cooling air supply rough, which is connected to the cooling air outlet openings and has a cooling air supply opening which is connected to the associated grate plate carrier.
  • This is a hollow beam assigned to each row, the cavity of which is used for supplying cooling air and on which the grate plates are mounted with their rear area projecting forward.
  • the recesses in the goods receiving area are designed so that they can hold part of the goods all the better, with steep boundary surfaces and as deep as possible in comparison with the available plate height.
  • the cross section of the cooling air supply space could indeed be increased by choosing a larger plate height; however, this increases the material requirement that determines the costs.
  • the higher panels then no longer fit the previously used, lower panels.
  • the invention is therefore based on the object of a sliding grate of the type described, as described in the generic term of Claim 1 is specified, or to improve an associated grate plate with regard to the air supply to the cooling air outlet openings without great expense.
  • This solution consists in that the depression of the material receiving surface at the back is less deep than at the front, so that the cooling air supply space has a correspondingly decreasing cross-sectional size from the back to the front.
  • the lowering of the receiving area takes place gradually from the back to the front.
  • the cooling air outlet openings or parts of the cooling air outlet slots located further ahead are better supplied with cooling air, and the front part of the plate which is particularly exposed to the action of heat from the material bed is better cooled.
  • the gradual or gradual lowering of the goods receiving surface to form the upper-side depression in the grate plate does not endanger the effect which the depression is intended to achieve. It is true that the thickness of the quantity of material held in the rear, flatter region of the depression is less than in the front region, so that its cooling effect is less, whereby there may also be a greater exchange of the material held. However, the cooling requirement or the heat protection requirement of the plate is also lower in the rear region of the depression. On the one hand, this is the fact that the rear region of the depression has more favorable heat dissipation conditions to the section of the plate which is located further back and is more protected. On the other hand, the front area of the front portion of the grate plate, close to the forehead, of the grate plate is more exposed to the effects of wear and heat from the material bed.
  • the reference surface to which the lowering of the material receiving surface relates, is formed by the imaginary plane which connects the sliding surface of the rear grate plate section with the upper edge of the front ledge delimiting the grate plate at the front.
  • the recess of the material receiving surface can hold cool material sufficiently despite its flatter design in the rear area, it is expediently provided with a device which prevents the material movement in the longitudinal direction relative to the grate plate and which is, for example, one or more transverse ribs.
  • the cooling air outlet openings are expediently formed by longitudinal slots in the cover wall forming the base of the depression, which are covered by cover strips, including their edges. As a result, the cooling air outlet openings open out in an approximately horizontal direction, which reduces the possibility of disadvantageous material diarrhea.
  • the cover strips are arranged in the longitudinal direction without stretching relative to the cover wall, so that the width of the outlet slots cannot be reduced by thermal expansion.
  • the cover strips are expediently connected to the part forming the sliding surface and possibly also to the front strip, preferably in one piece, while the cover wall forms a separate part, which is expediently fixed and, if necessary, to the bottom wall delimiting the cooling air supply space on the underside. is connected in one piece.
  • a contact surface is provided near the front end of the cover strips between the upper plate part comprising the cover strips and the lower plate part comprising the cover wall, the direction of this surface being dependent on the direction of the surfaces delimiting the cooling air outlet openings the top wall and the cover strips deviate to form an obtuse angle open at the top. If the upper plate part is exposed to greater heat during operation, it expands more than the lower plate part. Since both plate parts are connected to one another in the rear section of the grate plate, this results in a relative forward movement of the cover strips relative to the cover wall. The direction of this forward movement can be influenced by the contact surface.
  • this relative movement results in an enlargement of the cooling air outlet openings.
  • this feature results in an increase in the cooling air outlet openings in the case of a higher thermal load on the plate and thus an increased cooling in comparison with the case in the case of a lower thermal load.
  • the depression in the receiving area expediently extends over the entire grate plate width.
  • the longitudinal gap between two adjacent grate plates can be covered by an inlay strip to prevent rust diarrhea.
  • Fig.l is a plan view
  • FIG. 3 Fig. 3
  • Fig. 6 and 7 partial cross-sections through adjacent plates
  • Fig. 8 shows an enlarged detail from Fig. 3.
  • the grate plate consists of a lower plate part 1 (hatch to the top right) and an upper plate part 2 (hatch to the bottom right).
  • the lower plate part 1 forms a cooling air supply opening 21, the edge 3 of which can be placed tightly on the edge of a corresponding opening of a grate plate carrier (not shown).
  • fastening lugs 4 By means of fastening lugs 4, it can be fastened to the grate plate carrier in a known manner.
  • the grate plate protrudes forwardly from the grate plate carrier in order to overlap with its front section and in particular with its front lower edge 5 the sliding surface 6 formed by the rear section of the upper side of the next grate plate.
  • the top of the plate is formed, on the one hand, by the essentially flat rear sliding surface 6, over which the front part of the next rear grate plate pushes back and forth.
  • a cover wall 7 which slopes away obliquely from the back to the front and which is interrupted at two points in the form of a longitudinal opening 8 each.
  • Each longitudinal opening is covered by a cover strip 9, the edges of which form cooling air outlet slots 10 with the edges of the opening, which are covered by part of the cover strip 9 and open horizontally at the top of the cover wall 7.
  • the tops of the cover wall 7 and the cover strips 9 together form the goods receiving surface.
  • the cover strips 9 end in one piece at the front in the front strip 11 of the grate plate. Instead, this end strip could also be exchangeable as a wearing part.
  • the upper edge 12 of the face bar 11 is approximately at the same height as the flat, rear sliding surface 6 of the top of the grate plate. In comparison with the imaginary plane 18 connecting them, the cover wall 7 and the cover strips 9 are lower.
  • the recess (in contrast to the illustration in the drawing) can be delimited by edge strips, which can also be arranged lower than the connection plane 18.
  • the top wall 7 runs in one piece at the front to the front edge of the bottom wall 16.
  • the side edges of the top wall 7 and the bottom wall 16 are connected by walls 15, so that between them and the side walls 15 a cooling air supply space 17 is enclosed, which is connected on the one hand at the rear to the cooling air supply opening 2 and on the other hand to the cooling air outlet slots 10.
  • This reduction in cross section corresponds to the reduction in the quantity of cooling air which has to pass through this space in order to reach the cooling air outlet slots 10.
  • a uniform inflow of the cooling air to the cooling air outlet slots 10 and a correspondingly uniform inflow into the material bed are thereby achieved. Sufficient cooling air also reaches the foremost plate area.
  • Transverse ribs 19 rise from the surface of the top wall 7, which contribute to holding the material located in the recess 13 and preventing relative movement in the longitudinal direction.
  • the recess 13 extends over the entire width of the plate and continues in the adjacent plates, if so these are also trained. There is then also the gap 20 between adjacent plates within the depression (FIG. 6). Insofar as the upper limit of the gap 20 lies within the still good that is held in the depression, the amount of the fine material falling into the gap remains small. This is all the more true since the cooling air flow according to FIG. 3 is directed parallel to the bottom of the depression and therefore there is a high probability that any fine material that gets into the depression will be removed with the cooling air flow before it reaches the plate gap.
  • additional sealing means can also be provided for the plate gap 20, for example the cover strip 22 shown in FIG. 7.
  • the upper boundary of the cooling air outlet slots 10 is formed by the cover strips 9, which belong to the upper plate part and are free of expansion at their front end with respect to the lower plate part.
  • the lower boundary of the cooling air outlet slots 10 is formed by the top wall 7, which belongs to the lower plate part. Due to the inclination of these parts, the lower limit is located further back than the upper one.
  • the cover part 2 of the grate plate takes on a higher temperature during operation and will stretch more than the bottom part 1 of the grate plate. As a result, the upper and front limits of the cooling air outlet gap 10 move more forward than the lower limits, which is equivalent to an enlargement of the cross section of the cooling air outlet slot.
  • the upper grate plate part or the front end of the cover strips 9 is supported on the lower grate plate part via a contact surface 14 which, with the boundary surfaces of the cooling air outlet slot 10, forms an obtuse angle that opens upwards Alpha includes.
  • the surface 14 can run horizontally or parallel to the imaginary plate surface 18.
  • the angular arrangement of the contact surface 14 relative to the gap 10 prevents the gap-limiting surface of the cover strip 9 from touching the front End parallel to the gap delimitation surface of the top wall 7 or even approaches.
  • the greater the thermal load on the grate plate the greater the effect of an increase in the cooling air outlet cross sections with higher heat load on the plate.
  • the thermal bending to which the upper plate part of the grate plate is exposed leads to the same effect.
  • the cover strips 9 assume a higher temperature on their upper side than on their underside. This causes them to bulge up a little. Since they are supported at the front end by the support on the front end of the base part 1 of the grate plate, they bulge away from the lower boundary of the air outlet slots 10.
  • the exemplary embodiment shows a uniform, straight-line lowering of the cover plate 7 and the cover strips 9 from approximately the height of the rear sliding surface 6 to almost the depth of the base plate 16.
  • the cover wall 7 forms a small one at the transition to the rear, upper plate section 6 Level (Fig.3), which has a positive effect on the retention of cool goods.
  • This step can also be omitted, as is the case with the cover strips 9, or can be made stronger.
  • the lowering can also take place in stages instead of continuously.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)
  • Baking, Grill, Roasting (AREA)

Abstract

Une plaque grillagée utilisée pour former une grille coulissante d'un refroidisseur de matières cuites comprend un évidement (13) ménagé dans sa surface de réception des matières cuites et dans laquelle débouchent des orifices (10) de sortie d'air de refroidissement en provenance d'une chambre sous-jacente (17) d'amenée d'air de refroidissement. La profondeur de l'évidement (13) augmente d'arrière en avant et la section transversale libre de la chambre (17) d'amenée d'air de refroidissement diminue de manière correspondante d'arrière en avant en fonction des changements du courant d'air de refroidissement qui traverse la chambre.
EP95936572A 1994-10-31 1995-10-30 Grille coulissante pour refroidisseur de matieres cuites et plaque grillagee utilisee pour former cette grille coulissante Expired - Lifetime EP0789830B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE9417515U DE9417515U1 (de) 1994-10-31 1994-10-31 Schubrost für Klinkerkühler
DE9417515U 1994-10-31
PCT/EP1995/004259 WO1996013692A1 (fr) 1994-10-31 1995-10-30 Grille coulissante pour refroidisseur de matieres cuites et plaque grillagee utilisee pour former cette grille coulissante

Publications (2)

Publication Number Publication Date
EP0789830A1 true EP0789830A1 (fr) 1997-08-20
EP0789830B1 EP0789830B1 (fr) 1999-03-10

Family

ID=6915561

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95936572A Expired - Lifetime EP0789830B1 (fr) 1994-10-31 1995-10-30 Grille coulissante pour refroidisseur de matieres cuites et plaque grillagee utilisee pour former cette grille coulissante

Country Status (7)

Country Link
US (1) US5882189A (fr)
EP (1) EP0789830B1 (fr)
JP (1) JP3656098B2 (fr)
DE (2) DE9417515U1 (fr)
DK (1) DK0789830T3 (fr)
ES (1) ES2129861T3 (fr)
WO (1) WO1996013692A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9417829U1 (de) * 1994-11-07 1996-03-14 Babcock Materials Handling Division GmbH, 21614 Buxtehude Rostplatte für den Schubrost eines Kühlers
DE19633969A1 (de) * 1996-08-22 1998-02-26 Karl Von Wedel Schüttgutrost
EP0987494A1 (fr) * 1998-09-15 2000-03-22 Asea Brown Boveri AG Procédé pour le refroidissement d'une grille d'un foyer et grille d'un foyer
AUPR229100A0 (en) 2000-12-22 2001-01-25 Renewable Energy Corporation Limited Grate structure for solid fuel burners
DE102007019530C5 (de) * 2007-04-25 2018-01-04 Alite Gmbh Verfahren und Einrichtung zum Kühlen einer auf einem Förderrost liegenden Schüttgutschicht
US7921786B2 (en) * 2007-05-10 2011-04-12 Riley Power Inc. Grating system and sidewall seal arrangement for oscillating grate stoker
DE102008003692A1 (de) * 2008-01-09 2009-07-30 Khd Humboldt Wedag Gmbh Dichtung für einen Rostkühler
US20100122643A1 (en) * 2008-11-20 2010-05-20 Cole Arthur W Modular grate block for a refuse incinerator

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU457860A1 (ru) * 1973-10-26 1975-01-25 Колосник
US4876972A (en) * 1987-01-21 1989-10-31 Louis Mrklas Grate bar element for a sliding grate furnace for garbage incineration
DE3812425A1 (de) * 1988-04-14 1989-10-26 Peters Ag Claudius Kuehlerrostplatte
DE9012813U1 (de) * 1990-09-07 1990-11-08 Krupp Polysius Ag, 4720 Beckum Schubrostkühler
DE9012812U1 (de) * 1990-09-07 1990-11-08 Krupp Polysius Ag, 4720 Beckum Schubrostkühler
DE9108470U1 (de) * 1991-07-09 1991-08-29 Krupp Polysius Ag, 4720 Beckum Schubrostkühler
US5174747A (en) * 1991-09-03 1992-12-29 Fuller Company Grate plate
DE4134242A1 (de) * 1991-10-16 1993-04-22 Krupp Polysius Ag Kuehlrost
DE4205534A1 (de) * 1992-02-24 1993-08-26 Kloeckner Humboldt Deutz Ag Rostplatte fuer schubrostkuehler zum abkuehlen von heissem gut
US5433157A (en) * 1993-09-09 1995-07-18 Kloeckner-Humboldt-Deutz Ag Grate plate for thrust grating coolers for cooling hot material
DE4412885A1 (de) * 1994-04-14 1995-10-19 Krupp Polysius Ag Kühlrost
DE19504588B4 (de) * 1995-02-11 2006-07-13 Khd Humboldt Wedag Gmbh Rostplatte für Schubrostkühler zum Abkühlen von heißem Gut
US5575642A (en) * 1995-12-01 1996-11-19 The Carondelet Corporation Grate plate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9613692A1 *

Also Published As

Publication number Publication date
US5882189A (en) 1999-03-16
JP3656098B2 (ja) 2005-06-02
DE59505321D1 (de) 1999-04-15
WO1996013692A1 (fr) 1996-05-09
ES2129861T3 (es) 1999-06-16
JPH10508088A (ja) 1998-08-04
DK0789830T3 (da) 2000-06-05
DE9417515U1 (de) 1996-02-29
EP0789830B1 (fr) 1999-03-10

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