EP3384221B1 - Rostplatte für einen rostkühler - Google Patents

Rostplatte für einen rostkühler Download PDF

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Publication number
EP3384221B1
EP3384221B1 EP16801210.2A EP16801210A EP3384221B1 EP 3384221 B1 EP3384221 B1 EP 3384221B1 EP 16801210 A EP16801210 A EP 16801210A EP 3384221 B1 EP3384221 B1 EP 3384221B1
Authority
EP
European Patent Office
Prior art keywords
grate plate
grate
pocket
covering region
cooling air
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
Application number
EP16801210.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3384221A1 (de
Inventor
Waldemar KOROTEZKY
Klaus Zenker
Ravi SAKSENA
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.)
KHD Humboldt Wedag AG
Original Assignee
KHD Humboldt Wedag AG
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Filing date
Publication date
Application filed by KHD Humboldt Wedag AG filed Critical KHD Humboldt Wedag AG
Publication of EP3384221A1 publication Critical patent/EP3384221A1/de
Application granted granted Critical
Publication of EP3384221B1 publication Critical patent/EP3384221B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • F27D2015/0233—Cooling with means to convey the charge comprising a cooling grate grate plates with gas, e.g. air, supply to the grate

Definitions

  • the invention relates to a grate plate for use in a grate cooler for hot bulk material, comprising a first work area ('overlap area') which is alternately covered by at least one further grate plate when the grate plate is used in a grate cooler, the overlap area being at least one pocket for holding bulk material has an autogenous wear protection layer, and a second work area (when the grate plate is used in a grate cooler that is not covered by a further grate plate ('cover-free area')), the cover-free area for holding bulk material as an autogenous wear protection layer at least one pocket with at least one to the underside of the grate plate has leading opening for the introduction of cooling air.
  • a first work area ('overlap area') which is alternately covered by at least one further grate plate when the grate plate is used in a grate cooler, the overlap area being at least one pocket for holding bulk material has an autogenous wear protection layer
  • a second work area when the grate
  • Grate coolers are used to cool hot bulk goods, such as burned mineral goods or cement clinker that comes out of a rotary kiln.
  • the hot bulk material is transported over the cooling section of the grate cooler and is typically cooled by heat exchange with cooling air introduced in a crossflow process.
  • a transport method that is also suitable under extreme temperature and abrasive wear conditions is based on the popular moving grate cooler system.
  • the grate cooler consists of grate plate supports arranged in steps one behind the other. Fixed, static grate plate carriers alternate with movable grate plate carriers in the transport direction, which move in the transport direction towards and away from the transport direction when they are supported on movable, driven push frames.
  • grate plates are arranged in rows in the grate plate carriers.
  • the working area of the grate plates is the area of their top surface on which the hot bulk material rests or over which the bulk material is moved during the conveying process.
  • the back and forth movement of the movable grate plate carrier results in a partial overlap or overlap of two grate plates (rows) that follow one another in stages.
  • each grate plate (except on the first, top step) is divided into two work areas, namely a first work area, which is alternately covered by at least one grate plate of the step above due to the oscillating conveying movement of the movable steps during operation of the grate cooler , in short: overlap area, and in a second work area that is not covered by any grate plate from the step above, i.e. an overlap-free area.
  • the grate plates are particularly exposed to two strong, but also interacting wear effects.
  • the high, often in excess of 1000 ° C temperature of the hot bulk material softens the grate plate material, mostly steel.
  • the top of the grate plate is attacked by abrasive wear due to the relative movement to the hot bulk material, which is often present in granules.
  • grate plates therefore often have trough-like or pocket-like depressions.
  • rust plates are proposed, the working area of which has such pockets both in the overlap area and in the overlap-free area.
  • this retained material acts as an autogenous wear protection layer, since it is in direct contact with the material transported over the plate Prevents material with the pocket bottom.
  • this cooling layer also acts as thermal insulation, so that the grate plates, at least in the area of the pockets, have a higher surface hardness due to the lower temperature and thus also a higher resistance to wear.
  • the wear on the pocket base in the overlap region in particular temperature-induced wear and tear due to the compression of the bulk material layer, cannot be sufficiently reduced in general by cooling by means of cooling air supply through normal openings which lead to the underside of the grate plate.
  • the object of the invention is therefore to provide a grate plate for use in a grate cooler for hot bulk material which overcomes or at least mitigates the disadvantages mentioned in the prior art relating to cooling properties, economy and wear.
  • a grate plate for use in a grate cooler for hot bulk goods with the features of claim 1. Further advantageous refinements are specified in the subclaims to claim 1.
  • the height of the at least one pocket in the coverage area is smaller than the height of the at least one pocket in the coverage-free area.
  • the bottoms of which, in the untypical case, are not level and horizontal the average height must be assumed. If there are several pockets on the grate plate, the different ones Having a height, for example adapted to the bed geometry that is typical in the operation of the grate cooler, the deepest pocket of the overlap region, that is to say the one with the greatest height, is therefore smaller than the pocket with the lowest height of the uncovered region.
  • the person skilled in the art will first choose the height of the pockets in the overlap area so that on the one hand a sufficient autogenous wear protection layer is formed in them, but on the other hand the layer thickness is not too great, which would unnecessarily increase the flow resistance or pressure drop. Based on this, the height of the pockets in the overlap area according to the invention to be smaller, typically considerably smaller, but without making the pockets so flat that no wear protection layer could be held on, leads to the described compression of the held bulk layer being less pronounced.
  • the flow resistance or pressure loss in the cover area is therefore advantageously reduced compared to the use of pockets of the same height as in the cover-free area, so that the disadvantages explained at the outset - in particular with regard to an uneconomical increase in the air inflow speed, with regard to temperature-induced wear in the pockets of the cover area and with regard to cooling disadvantages in the area without overlap (unfavorable temperature gradients, cold runner risk) - are weakened.
  • the pockets are designed in such a way that the pockets have the same height in the overlapping area and the pockets have the same height in the overlapping area. It is further provided that the height of the at least one pocket in the overlap region is less than a third, preferably less than one fifth, of the height of the at least one pocket in the region without overlap.
  • the training opportunity is an autogenous one Wear protection layer. This depends on the nature of the hot bulk material, but it has been shown that holding such a layer for typical grate cooler applications, in particular for cement clinker cooling, is possible without problems even at heights of the height relationships mentioned.
  • the height of the pocket in the coverage area should typically be no less than 5% of the pocket height in the coverage-free area.
  • the pocket height to less than a third, preferably less than a fifth
  • good wear protection of the pockets in the area of overlap and effective, uniform cooling in the entire area are ensured, which can be attributed to the alternating removal of the overlap area from a hot bed layer by the oscillating lifting movement.
  • the bottom of the at least one pocket in the overlap area is formed by a plurality of segments, the upper sides of which serve as a support surface for bulk material and between which gap-like cooling air channels are formed for the supply of cooling air.
  • the openings of the cooling air ducts between the upper sides of the segments are each aligned at such an angle to the vertical that there is an acute angle between the conveying direction of the bulk material and the direction of the cooling air flow through the openings.
  • a flow of bulk material designed in this way which, apart from the deflections and swirling on and in the bulk material that then occur, is predominantly oriented in the conveying direction with vector components, supplies the surface of the grate plate on the pocket bottom, and consequently the tops of the segments, in comparison to exactly upwards directed openings additionally with cooling air and in this way additionally reduces the temperature-induced wear of the grate plate.
  • the openings of the cooling air channels between the upper sides of the segments are aligned in the overlap area so that when the grate plate is used in a grate cooler, the cooling air flow is introduced approximately in the conveying direction of the bulk material.
  • the cooling air flow is therefore directed approximately parallel to the surface of the segments, which both reduces the compression effect, although not completely prevented according to the invention (an adequate autogenous wear protection layer is retained), and also ensures better cooling of the segments, and therefore the pocket.
  • grate plates are functionally advantageously arranged in a row next to each other in a grate cooler, ie transversely to the conveying direction, and in a grate plate the pockets are in turn arranged in rows transversely and parallel to the conveying direction, that is to say in a mesh-like or grid-like manner.
  • an advantageous embodiment of the invention provides that in the at least one pocket in the overlap area the segments forming the bottom are arranged one behind the other in relation to the conveying direction.
  • the openings of the cooling air channels which are formed gap-like between adjacent segments without interruption over the entire width of the pocket, ensure a uniform opening Cooling favors. In this case, straight segment boundaries formed perpendicular to the conveying direction prove to be particularly advantageous.
  • connection element for example a hook device
  • a hook device for below the overlap area the grate plate is attached in a grate cooler.
  • a hook or a correspondingly different connecting element should preferably be arranged in the center of the underside, that is to say in the vertical center plane of the grate plate that runs parallel to the conveying direction.
  • the upper sides of the segments form the contact surfaces for the bulk material acting as a wear protection layer in the pockets of the overlap area and thus the bottom of these pockets.
  • the tops are therefore essentially flat, for example.
  • the segments must be able to withstand the loads of force due to the hot bulk material lying on top and conveyed with thrust pressure and must form the cooling air ducts according to the invention between them.
  • the segments Viewed from a long side of the plate (here assumed to be horizontally mounted), transversely to the conveying direction, the segments thus have a double-angled profile with a horizontal, flat, approximately cuboidal component at the bottom, and also an upward-extending component at its end (seen in the conveying direction) approximately cuboidal component and with a third, approximately horizontal, approximately cuboidal component in the conveying direction, which attaches to the end of the segment and forms the top of the segment, so that the profile is given the shape of a stylized, angular "S".
  • the shape is not fixed to an exactly right internal angle between the components, rather the shape can also be slightly sheared, preferably sheared in the conveying direction.
  • the edges between the components can also be rounded for manufacturing reasons; slightly curved components also meet the requirements mentioned.
  • the double-angled segments can preferably be designed with a sheared shape in the transport direction and / or with their tops (descending in the direction of transport) can be arranged in stages or also be designed with correspondingly inclined or beveled tops.
  • a further advantageous embodiment of this embodiment consists in that the segments of the at least one pocket of the covering area have at least on their top side at least one rib-like armor extending in the conveying direction and thereby obliquely to the center of the transverse extent of the covering area.
  • the cooling air which is carried out from the cooling air ducts between the double-angled segments in or approximately in the conveying direction thus becomes part of the armoring to the center of the coverage area steered on the top of the grate plate, the center of the plate top being given by its central axis running in the conveying direction. Due to the bed geometry given here in phases, there may be increased cooling requirements in the middle plate area.
  • the central region of the overlap region in typical embodiments is pocket-free in order to enable the underside of the plate to be fastened to the grate cooler.
  • the armor plates, typically given as build-up welds, are made of particularly wear-resistant material, because due to their exposed position they are exposed to high abrasive and temperature-related wear.
  • the segments of the at least one pocket of the cover area each have at least one air guide rib, which guides cooling air starting in the bottom area of the grate plate and running over the respective segment up to the top of the segment.
  • cooling air is additionally conducted in regions of the upper side of the double-angled segment which, due to the autogenous wear protection layer and the cooling air deflection that is provided, in particular upwards, otherwise experience inadequate cooling.
  • An obliquely inward arrangement of the air-guiding ribs provides the advantages given by the armouring in the above-described embodiment of increased cooling of the central region of the overlap region by partially deflecting the cooling air flow from the gap-like cooling air channels between the segments.
  • the at least one opening leading to the underside of the grate plate for the introduction of cooling air is arranged such that when the grate plate is used in a grate cooler, the opening direction is one Has an angle to the vertical.
  • the opening for the cooling air supply is, for example, a cylindrical channel
  • the longitudinal axis of this tube is not positioned vertically, but forms an acute angle to the vertical direction.
  • the projectively reduced opening mouth towards the vertical and the angled opening course mean that larger particles of the hot bulk material, e.g. B. larger cement clinker granules, fix in the cooling air supply channel and then advantageously form a barrier for trickling bulk material, whereby the rust diarrhea is reduced.
  • larger particles of the hot bulk material e.g. B. larger cement clinker granules
  • the bulk material is conveyed by thrust by means of the end face of the moving grate plates in the conveying direction in the manner of a conveying edge.
  • the grate plates therefore have a push edge on their front face.
  • this fulfills the function of a counter surface in the event of possible movements of the bulk material against the conveying direction during the alternating movement cycle of the moving grate plate rows.
  • the grate plate has an exchangeable push edge in an economically advantageous manner, since the push edge is exposed to particularly heavy wear.
  • the size of the gap to the grate plate closest to the conveying direction is set by the expansion of the pushing edge in the vertical direction perpendicular to the conveying direction.
  • FIG. 1 A grate plate 1 according to the invention is shown, the upper side of which is composed of a first work area, the overlap area 2, and a second work area, the overlap-free area 3.
  • hot bulk material (not shown) falls from the grate plate step above it onto the overlap area 2 and is pushed from there by the oscillating back and forth movement of the grate plate (s) 1 located above into the overlap-free area 3.
  • FIG Figure 4 As in Figure 5 ).
  • movably mounted rows of rust plates 1 alternate with statically fixed rows.
  • the upper grate plate 1 can be assumed to be movable and oscillating pushing movements, while the lower grate plate 1 is stationary. In this way, bulk material (not shown) that has fallen from the upper grate plate 1 into the overlap area 2 of the lower grate plate 1 is pushed through the shear edge 4 of the upper grate plate 1 into the overlap-free area 3 of the lower grate plate 1 and through at the next push cycle coming bulk goods conveyed from the lower grate plate 1 over its push edge 4. In all figures, the conveying direction (minus perspective twists) is therefore from left to right.
  • the thrust edge 4 of the upper grate plate 1 in each case thus overlaps the maximum overlap area 2 of the grate plate 1 underneath at maximum feed position, but does not reach the overlap-free area 3.
  • the grate plate 1 has pockets 5 in the overlap-free region 3, which are preferably arranged in rows and transverse to the conveying direction, as in the exemplary embodiment shown. Bulk material is retained in the grate cooler during operation, which forms an autogenous wear protection layer (not shown) for the pockets 5 in the overlap-free area 3. In contact with this layer, the bulk bed is transported over the grate plate 1. Openings 6 are arranged in the bottom of the pockets 5 in the overlap-free area 3, which lead to the underside of the grate plate 1 and are blown through the cooling air into the wear protection layer and the conveyed good bed layer located thereon.
  • the pockets 5 in the overlap-free area 3 have a height 7 which is just sufficient for the formation of the wear protection layer, as shown in FIG Figure 2b as in Figure 3b is drawn. Pockets 5 are also arranged in the overlap area 2 (see FIG. Figure 1 ), which has such a height 8 (s. Figure 3b and Figure 5 ) that they also hold an autogenous wear protection layer (not shown) during operation.
  • the bottom of the pockets 5 in the overlap region 2 is formed by the upper sides of several segments 9 each. These tops serve as contact surfaces for the wear protection layer made of retained bulk material. Between the segments 9 of a pocket 5 arranged one behind the other in the illustrated embodiment, gap-like cooling air channels 10 are formed for the supply of cooling air.
  • the height 8 of the pockets 5 in the overlap area 2 is also substantially smaller (less than a third, preferably less than a fifth) of the height 7 of the pockets 5 in the overlap-free area 3, as in particular also in Figure 3b is recognizable.
  • FIG 2b is along the section line AA Figure 2a resulting cross-sectional view through the grate plate 1 shown.
  • a hook 11 is arranged as a connecting element in the central region of the underside of the grate plate 1 under the overlap region 2. For reasons of stability, there is no pocket above the hook 11, but a material surface of sufficient thickness.
  • the double-angled segments are provided with an additional air-guiding rib 12, which guides the cooling air far to the top of the respective segment 9 and thus further improves the cooling effect and wear protection.
  • the additional air guiding ribs 12 guide the cooling air from the cooling air duct 10 between the segments 9 in the direction of the center of the overlap area 2, where the grate plate 1 in the exemplary embodiment does not have a pocket 5 and therefore also does not have cooling due to the fastening components 11 attached underneath or heat-insulating wear protection layer.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Furnace Details (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
EP16801210.2A 2015-12-03 2016-11-24 Rostplatte für einen rostkühler Active EP3384221B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015015632.2A DE102015015632B4 (de) 2015-12-03 2015-12-03 Rostplatte für einen Rostkühler
PCT/EP2016/078659 WO2017093111A1 (de) 2015-12-03 2016-11-24 Rostplatte für einen rostkühler

Publications (2)

Publication Number Publication Date
EP3384221A1 EP3384221A1 (de) 2018-10-10
EP3384221B1 true EP3384221B1 (de) 2020-01-01

Family

ID=57394572

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16801210.2A Active EP3384221B1 (de) 2015-12-03 2016-11-24 Rostplatte für einen rostkühler

Country Status (7)

Country Link
US (1) US20180363985A1 (es)
EP (1) EP3384221B1 (es)
CN (1) CN108291777B (es)
DE (1) DE102015015632B4 (es)
DK (1) DK3384221T3 (es)
ES (1) ES2781466T3 (es)
WO (1) WO2017093111A1 (es)

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Publication number Priority date Publication date Assignee Title
DE970380C (de) * 1955-02-23 1958-09-11 Moeller Johannes Vorrichtung zum Kuehlen von Zementklinker
DE3812425A1 (de) * 1988-04-14 1989-10-26 Peters Ag Claudius Kuehlerrostplatte
JPH0222155A (ja) * 1988-07-07 1990-01-25 Kurimoto Ltd グレートプレート
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
DE4421552A1 (de) * 1994-01-24 1995-07-27 Krupp Polysius Ag Schubrostkühler
DE4412885A1 (de) * 1994-04-14 1995-10-19 Krupp Polysius Ag Kühlrost
US5575642A (en) * 1995-12-01 1996-11-19 The Carondelet Corporation Grate plate
CH700197B1 (de) * 2006-02-02 2010-07-15 Mertec Ag Kühlerplatte mit Schlitzmuster für Rostkühler.
DE102009009285B4 (de) * 2009-02-17 2013-11-28 Ikn Gmbh Rostplattenanordnung
DE102011080998B4 (de) * 2011-08-16 2016-07-14 IKN GmbH Ingenieurbüro-Kühlerbau-Neustadt Kühlrost und Rostsegment zum Kühlen von Zementklinker
CN202304448U (zh) * 2011-10-08 2012-07-04 广州圣嘉机电设备有限公司 一种箅冷机箅板
CN202361815U (zh) * 2011-10-11 2012-08-01 成都建筑材料工业设计研究院有限公司 低阻力无漏料篦板
DE102014008010B4 (de) * 2014-06-05 2018-11-29 Khd Humboldt Wedag Gmbh Rostplatte für einen Rostkühler

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN108291777B (zh) 2019-12-20
EP3384221A1 (de) 2018-10-10
WO2017093111A1 (de) 2017-06-08
ES2781466T3 (es) 2020-09-02
DE102015015632B4 (de) 2017-12-07
CN108291777A (zh) 2018-07-17
DE102015015632A1 (de) 2017-06-08
US20180363985A1 (en) 2018-12-20
DK3384221T3 (da) 2020-03-23

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