EP2645034B1 - Grate element for a grate cooler - Google Patents
Grate element for a grate cooler Download PDFInfo
- Publication number
- EP2645034B1 EP2645034B1 EP12161886.2A EP12161886A EP2645034B1 EP 2645034 B1 EP2645034 B1 EP 2645034B1 EP 12161886 A EP12161886 A EP 12161886A EP 2645034 B1 EP2645034 B1 EP 2645034B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grate
- support structure
- leg
- grate element
- recess
- 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.)
- Active
Links
- 239000013590 bulk material Substances 0.000 claims description 27
- 210000001364 upper extremity Anatomy 0.000 claims description 15
- 125000006850 spacer group Chemical group 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000000295 complement effect Effects 0.000 claims description 2
- 239000000969 carrier Substances 0.000 description 6
- 239000000112 cooling gas Substances 0.000 description 5
- 239000004568 cement Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
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
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/06—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces with movable working chambers or hearths, e.g. tiltable, oscillating or describing a composed movement
-
- 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
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/201—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace walking beam furnace
- F27B9/202—Conveyor mechanisms therefor
- F27B9/203—Conveyor mechanisms therefor having ramps
-
- 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
- the invention relates to a grate element for a grate cooler for cooling and transporting bulk material, like for example cement clinker.
- the bulk material is cooled by injecting a cooling gas into the bulk material.
- the grate element has at least a box like support structure for a rest onto which the bulk material can be unloaded.
- the grate element has a preferably corner steel like front element which is supported by the support structure.
- the front element comprises preferably at least a front leg and a top leg, wherein the front leg covers the front facing side of the support structure at least partially and the top leg may be positioned on top of the support structure as part of the rest for the bulk material.
- Clinker as well referred to as cement clinker is typically sintered in a rotary kiln.
- the clinker is discharged from the kiln onto a grate cooler. Air or a different cooling gas is injected into the clinker through openings in the grate surface of the cooler, which supports the clinker.
- US-Patent 5,862,906 discloses a clinker cooler with box like grate elements.
- the grate elements are mounted in rows on beam like grate carriers, which are arranged in parallel to each other. Each row overlaps the row in front of the respective row and thereby the rows of grate elements form a grate floor.
- the grate floor thus resembles a stair, where each row of grate elements constitutes a step.
- Some of the grate carriers oscillate forward and backward, thereby transporting the bulk material to a discharge end of the grate floor, where the bulk material is discharged for example into a crusher.
- Each grate element comprises a box like support structure, supporting grate segments as rest for the clinker.
- the grate segments are slit or slot like nozzles for injecting a cooling gas into the bulk material.
- the grate segments are inserted one after the other from the open front side of the support structure into guidance rails.
- the last grate segment is a corner steel like front element.
- the front element has a front leg and a top leg, wherein the front leg is attached to the front facing side of the support structure by a bolt.
- the top leg is positioned on top of the support structure as part of the rest and blocks the previously inserted grate segments in the guidance rail.
- US-Patent application 2010/0206288 A1 discloses a grate element for a grate cooler with a box like support structure into which grate segments are inserted on guidance rail like grooves. The last, i.e. front facing grate segment is secured by a front plate which is attached by three bolts to the support structure.
- US 7,021,928 discloses a grate element for a grate cooler with a box like support part.
- the support part has a bottom plate from which rises a peripheral frame of lateral edge strips.
- a front element engages behind the front edge strip and is secured in its position against being lifted off by a cover plate residing on top of the lateral edge strips and overlapping the front element.
- WO 2011/151130 A1 suggests a grate element with a grid plate having cavities with a fin shaped bottom.
- the slope of the fins is chosen to enable a cooling air flow being injected through the cavities into the bulk material to keep the cavities clean of said bulk material.
- the invention is based on the observation that the bolts, by which the front elements are attached to the supporting.structure of the grate elements tend to get lost during operation of the grate floor cooler. If this happens, the grate segments slide out of the supporting structure, clinker may enter the support structure and the cooling efficiency is thus reduced. In addition the clinker may over long term destroy the support structure due to abrasion.
- the problem to be solved by the invention is to provide a grate surface where the grate segments are secured against getting lost, even in case the prior art bolts break or get unscrewed due to vibrations, thermal stress or the like.
- a grate element of the present invention can be a part of a grate cooler for cooling and transporting bulk material in a forward direction, for example from a kiln to some further processing unit.
- the further processing unit may be for example a crusher, a bulk tank or a bunker.
- the grate element has at least a box like support structure for an upside facing rest for supporting the bulk material.
- the rest may for example be formed by grate segments covering the box like support structure. Ventilation slits or nozzles may be formed in and/or between the grate segments.
- the grate segments, as well referred to as grate bars, may be inserted for example via an opening in the front or rear wall of the support structure.
- the support structure may comprise guidance rails for inserting grate segments.
- the grate element further comprises at least one front element, the latter being supported by the support structure.
- the front element may be corner steel like and may thus comprise at least a front leg and a top leg.
- the front leg covers a front side of the support structure at least partly.
- the front leg may close an opening in the front wall of the support structure, via which for example grate segments could be inserted.
- the top leg is preferably positioned on top of the support structure as part of the rest.
- the front element may preferably block the grate segments in their respective intended positions.
- the support structure has at least one recess and the front element has at least one protrusion engaging into the recess, thereby blocking the front element against translation at least in a forward direction relative to the grate element. Additional bolts may be used to further attach the front element to the support structure, however even if these bolts get lost during operation of the grate cooler, the front element will rest in its intended position and may still block the grate segments in their intended respective positions.
- forward direction front side, front wall, rear side, rear wall and the like refer to the orientation given by the direction of transportation of the bulk material, i.e., the outlet of the grate floor cooler faces in the forward direction.
- the distal part of the protrusion has the form of a ring segment and the recess has at least a complementary ring segment like section.
- the protrusion can thus be inserted into the recess by pivoting the front element.
- the front element and the support structure are thus releasable connected by pivoting the protrusion into the recess.
- Such pivotal fastening permits a simple and reliable interlocking of the front element with the support structure.
- the pivotal fastening has pivot axle, which is preferably parallel to a front edge of the support structure. Thereby, a translation of the front element in the direction of transportation of the bulk material can be prevented.
- the pivotal fastening may have a pivot axle that coincides with the top rear edge of the top leg or is above and/or behind the top rear edge of the top leg. Such pivotal fastening ensures that the front element is pushed downwards by the bulk material moving over the top leg.
- the grate segments or more general the front side of the rest may not block the front element, when inserting the protrusion into the recess by pivoting the front element relative to the support structure.
- the front element may block elements of the rest, for example grate segments in guidance rails.
- the front element can be mounted and replaced very easily, even in a built in situation of the grate element.
- a spacer or an adjustment plate is positioned, e.g., clamped, between the front leg and the front facing side of the support structure.
- the space permits to define and adjust a moving gap, being formed by the slit between the lower side of an overlapping part of a grate element and the top facing surface of a subsequent grate element.
- the spacer may in a preferred embodiment have the form of flat bar with a downward facing straight edge or plane surface, being at least substantially parallel to the rest and thereby to the rest of the subsequent lower grate element.
- the straight edge or plane surface of the spacer extends preferably over the full width ( ⁇ 25%) of the rest.
- the front element may be fastened by at least one bolt to the support structure.
- the at least one bolt may prevent the front element from unintended pivoting.
- the at least one bolt may be screwed via the front leg into the support structure.
- the box like support structure preferably houses a cross beam supporting at least one thread for the at least one bolt.
- the cross beam may be blocked by the front wall. This yields an easy to mount and, however, stable connection of the front plate with the support structure via the bolt.
- the cross beam may preferably be mounted floatingly, thereby reducing unintended strain to the cross beam, the bolt, the support structure and/or the front element. "Mounted floatingly" means that he cross beam can be moved within float limits relative to the front wall of the box like support structure.
- the cross beam may for example have at least one whole with a thread for a bolt and/or may support as least one screw nut as counterpart for a bolt.
- the box like support structure preferably houses a retaining member, engaging with the cross beam and positioning the at least one thread in alignment with at least one opening in a front wall of the support structure. This permits to define the limits of float of the cross beam in the box like support structure.
- Figure 1 shows an isometric view of a detail of a grate cooler for cooling bulk material like for example cement clinker.
- the grate cooler comprises grate elements 10 being positioned in rows one beside another on beam like grate carriers 5, which are arranged in parallel to each other. Each row of grate carriers overlaps the subsequent row.
- the grate elements 10 form a stepped grate floor, where each row of grate elements 10 forms a step.
- At least one of the grate carriers 5 may be powered to oscillate forward and backward, as indicated by double arrow 6.
- a row of grate elements 10 When a row of grate elements 10 is moved forward, it pushes bulk material in a forward direction, and when it is subsequently retracted bulk material fills the resulting space and with the next forward movement the bulk material is again pushed forward. Thus, by the oscillating movement of at least some of the rows the bulk material is transported.
- the bulk material may as well be cooled. To this end a cooling gas may be provided through the grate carriers 5 to the grate elements 10 and is blown through slit like nozzles 12 (see Fig. 3 ) into the bulk material.
- FIG. 2 shows an isometric view of a support structure 20 of a grate element 10.
- the support structure 20 is box like and can be for example made from some sheet material: The rear wall 21, the front wall 22 and the side walls 23 can be folded upwards to form an open box. The remaining sheet material forms a base plate 28.
- the base plate has an opening, through which a cooling gas is fed to the grate element.
- Attached to the base plate is a clamping fixture 27 for attaching the support structure 20 and thereby the grate element 10 to a grate carrier 5.
- Attached to the base plate 28 and/or the side walls 23 are guidance rails 26, which are preferably at least substantially parallel to the side walls 23.
- In each of the side walls 23 of the support structure 20 is a recess 63 with a ring segment like shape into which a protrusion of a front element 50 may be inserted, as will be explained below.
- FIG. 3 shows the grate element 10 after the next assembly step.
- Figure 4 shows the grate element of Fig.3 from a different perspective.
- a part of the support structure 20 is covered by a cover plate 24 and grate segments 25.
- the cover plate 24 and the grate segments 25 have been inserted into the guidance rails 26 through an opening in the front side of the support structure 20 and form part of the rest for the bulk material.
- a cross beam 30 with press fitted screw nuts 34 is inserted into the support structure 20, just behind the front wall 22, as indicated by arrows 33. Both distal ends of the cross beam 30 are slightly bent to the rear and have a slit like opening into which a nose like protrusion 42 of a retaining member 31 engages.
- the retaining member 31 cross beam 30 assembly positions the nuts 34 in alignment with through holes 44 in the front wall 22.
- the nuts 34 are counterparts of bolts 35 for fastening a front element 50 (see Fig. 5 ). When fastening the bolts 35, the nuts are blocked by the rear side of the front wall 22.
- Fig. 5 shows two grate elements 10 forming a step.
- a front element 50 has been attached to each of the support structures 10, thereby blocking the grate segments 25 and the cover plates 24 in their positions. Only for purpose of explanation the front element 50 of grate element 10 of the 'upper step' is not yet fully mounted. This is depicted in detail in Fig. 7 .
- the front element 50 is a corner steel like profile with a top leg 51 and a front leg 52.
- On the bottom side of the top leg 51 is a ring segment like protrusion 53.
- a recess 63 In each of the side walls 23 is a recess 63, into which the ring segment like protrusion 53 can be inserted by pivoting the front facing side front element 50 downwards.
- the pivot axle coincides with the rear facing side of the top leg 51 of the front element 50.
- the rear facing side of the front element in particular the rear facing side of the top leg 51, blocks the grate segments 25 and the cover plate 24.
- a spacer 70 between the front wall 22 and the rear side of the front leg 52 of the front element 50 (see Fig. 5 and Fig. 6 ).
- the spacer 70 permits to adjust the gap between the 'upper' grate element 10 and the subsequent (in the forward direction) grate element 10.
- the front element is pivoted downwards and fixed in its position by bolts 35 (see Fig. 5 ).
- the spacer 70 can be clamped at a well defined height above cover plate 24 of the lower grate element 10, thereby defining a moving gap between the succeeding grate elements 10.
- the height of the spacer 70 and thus the height of the motion gap may be adjusted using a settle jig.
- the fully mounted position of the front element is shown in Detail in Fig. 8 :
- the protrusion 53 is inserted in a form fitting manner into the recess 63.
- the top leg 51 forms, together with the grate segments 25 and the cover plate 24 (not shown, see Fig. 5 ), a rest for supporting the bulk material. Even if all of the three bolts 35 get lost, the front element 50 will remain in its intended position and block the grate segments 25 and the cover plate 24, thereby preventing them from getting lost as well.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK12161886.2T DK2645034T3 (en) | 2012-03-28 | 2012-03-28 | Shake element for a shaker cooler |
ES12161886.2T ES2544833T3 (es) | 2012-03-28 | 2012-03-28 | Elemento de rejilla para un enfriador de rejilla |
EP12161886.2A EP2645034B1 (en) | 2012-03-28 | 2012-03-28 | Grate element for a grate cooler |
PL12161886T PL2645034T3 (pl) | 2012-03-28 | 2012-03-28 | Element rusztowy dla chłodnicy rusztowej |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12161886.2A EP2645034B1 (en) | 2012-03-28 | 2012-03-28 | Grate element for a grate cooler |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2645034A1 EP2645034A1 (en) | 2013-10-02 |
EP2645034B1 true EP2645034B1 (en) | 2015-05-27 |
Family
ID=45976732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12161886.2A Active EP2645034B1 (en) | 2012-03-28 | 2012-03-28 | Grate element for a grate cooler |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2645034B1 (es) |
DK (1) | DK2645034T3 (es) |
ES (1) | ES2544833T3 (es) |
PL (1) | PL2645034T3 (es) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101815537B1 (ko) | 2015-01-26 | 2018-01-30 | 얼라이트 게엠베하 | 폐기물-소각로 화격자를 위한 금속-세라믹 화합물 화격자 바 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2843342B2 (en) | 2013-08-27 | 2019-07-03 | Alite GmbH | Clinker cooler |
DK3112786T4 (da) | 2015-07-03 | 2021-04-26 | Alite Gmbh | Klinkerindløbsfordeling for en cementklinkerkøler |
Family Cites Families (4)
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 |
DE4441009C2 (de) | 1994-11-17 | 2001-03-29 | Karl Von Wedel | Rostplattenanordnung |
DE102009009285B4 (de) | 2009-02-17 | 2013-11-28 | Ikn Gmbh | Rostplattenanordnung |
BE1019360A3 (fr) * | 2010-06-03 | 2012-06-05 | Magotteaux Int | Plaque de grille. |
-
2012
- 2012-03-28 PL PL12161886T patent/PL2645034T3/pl unknown
- 2012-03-28 ES ES12161886.2T patent/ES2544833T3/es active Active
- 2012-03-28 DK DK12161886.2T patent/DK2645034T3/en active
- 2012-03-28 EP EP12161886.2A patent/EP2645034B1/en active Active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101815537B1 (ko) | 2015-01-26 | 2018-01-30 | 얼라이트 게엠베하 | 폐기물-소각로 화격자를 위한 금속-세라믹 화합물 화격자 바 |
Also Published As
Publication number | Publication date |
---|---|
DK2645034T3 (en) | 2015-08-31 |
PL2645034T3 (pl) | 2015-10-30 |
EP2645034A1 (en) | 2013-10-02 |
ES2544833T3 (es) | 2015-09-04 |
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