EP0157920B2 - Roll for a roller grate, for example for a refuse burning plant or the like - Google Patents
Roll for a roller grate, for example for a refuse burning plant or the like Download PDFInfo
- Publication number
- EP0157920B2 EP0157920B2 EP84114826A EP84114826A EP0157920B2 EP 0157920 B2 EP0157920 B2 EP 0157920B2 EP 84114826 A EP84114826 A EP 84114826A EP 84114826 A EP84114826 A EP 84114826A EP 0157920 B2 EP0157920 B2 EP 0157920B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- grate
- bar
- roller
- roller according
- bars
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 27
- 239000000126 substance Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000002184 metal Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 12
- 238000004056 waste incineration Methods 0.000 description 7
- 239000002699 waste material Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 206010012735 Diarrhoea Diseases 0.000 description 2
- 229910001361 White metal Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000010969 white metal Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L1/00—Passages or apertures for delivering primary air for combustion
- F23L1/02—Passages or apertures for delivering primary air for combustion by discharging the air below the fire
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B1/00—Combustion apparatus using only lump fuel
- F23B1/16—Combustion apparatus using only lump fuel the combustion apparatus being modified according to the form of grate or other fuel support
- F23B1/165—Combustion apparatus using only lump fuel the combustion apparatus being modified according to the form of grate or other fuel support using roller grate
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- 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
- F23G5/002—Incineration of waste; Incinerator constructions; Details, accessories or control therefor characterised by their grates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23H—GRATES; CLEANING OR RAKING GRATES
- F23H17/00—Details of grates
- F23H17/12—Fire-bars
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23H—GRATES; CLEANING OR RAKING GRATES
- F23H9/00—Revolving-grates; Rocking or shaking grates
- F23H9/02—Revolving cylindrical grates
Definitions
- the invention relates to a grate roller for a grate of a waste incineration plant or the like with a hollow shaft and a cylindrical support structure with grate bar supports on which arc-shaped grate bars are arranged with the outer web walls forming the combustion chamber-side roll shell, each grate bar having a cross section essentially T-shaped with a base bar and one Cross bar is formed, and wherein air gaps for the supply of primary air are formed in each case between the cross bars of two adjacent grate bars.
- a waste incineration plant in which the invention can be implemented for example, consists of a feed device with a reciprocating slide with which the waste is pushed into the combustion chamber through an opening in a filling shaft.
- the waste In the firebox, the waste is exposed to intense flame radiation.
- Downstream of the feed device is a roller grate in the firebox, which is designed as a sloping grate and consists of five or six grate rollers of approximately 1.5 m in diameter arranged one behind the other in a plane inclined at approximately 30 ° in the transport direction, so-called pockets being formed between the grate rollers.
- the most important design features of the grate roller are usually a hollow shaft mounted on both sides and a cylindrical support structure with radial walls for holding the axially extending grate bar supports, on which the circular-arc grate bars made of rust bar cast are lined up next to one another and one behind the other, with slots remaining free between adjacent bars.
- the grate bars form the jacket of the grate roller or the so-called grate covering. Due to the rotation of the grate roller, they are only temporarily exposed to fire and can cool down again in the air zones.
- Guide walls are arranged between the grate rollers, which seal the rollers from one another and, together with the grate rollers, form pockets in which the waste is turned.
- the roller grate is embedded in a sheet metal housing divided for each grate roller.
- the air is supplied to these zones from the side in controllable quantities. From the zones, the air should pass through the grate and the fuel waste bed into the combustion chamber.
- the drying and ignition of the easily combustible components have started.
- the garbage falls into the pocket formed by the first guide wall and the first grate roller as a slice or chunk of low thickness until the slowly rotating grate roller removes the material adhering to its surface from below out of your pocket. It passes through the grate roller into the second pocket between the first and second rollers. This process is repeated from roller to roller and brings an intensive turn of the garbage, which soon leads to a good base fire.
- the air distribution is adapted to this combustion pattern with the adjustable underwind zones.
- the amount of air added is low in the drying and ignition zone. It reaches its maximum in the main combustion zone and decays to a minimum in the burnout zone.
- the grate bars of a known type of grate rollers consist of a relatively narrow, from the side, arcuate web with two side walls, a head and a foot wall and a fire-side outer web wall.
- projecting tooth-like projections are arranged on each side wall at a regular distance from each other parallel to the direction of the axis of the grate roller, each projection of one side wall being positioned diagonally to the projection of the other side wall and the projections of a grate bar into the gaps between the projections of a grips laterally adjacent other grate bar, leaving a gap between adjacent grate bars of about 5 mm in width. As described, this gap is intended for supplying air.
- the grate bars are shaped so that they can be placed one behind the other in the circumferential direction on the grate bar supports and stored there in a stationary manner.
- the gaps between adjacent grate bars cannot be kept much narrower.
- the width of the gaps is in turn responsible for the fact that relatively thin, still unburned waste components can get through the gaps into the interior of the roller, which results in the effects described.
- Another grate roller for a roller grate for waste incineration is known from DE-B-1 164 014.
- the problem is also addressed here. that when garbage is burned by fractions of easily melting metals, there is a slight blockage of the rust coating in the gaps between the grate bars.
- the molten metal drips from the firing layer of the upper part through the grate gaps into the interior of the roller and thus onto the back of the lower grate bars passing through the cooling air space during the combustion process. This easily clogs the rust gap in the lower run, into which the metal flows and cools there. According to this publication, this falling through of molten metal through the inside of the roller onto the cool grate bars of the lower run is to be made impossible.
- each grate roller consists of a hollow shaft that has holders for grate bar supports.
- Cross-sectionally T-shaped grate bars are suspended between the grate bar supports in such a way that they form the casing of the grate roller.
- air slots are formed between the grate bars.
- the abutting side surfaces of two adjacent grate bars are kept at a distance by spacers. But this distance is obviously, i.e. the gap or slot width, so large that - as in the prior art described above - disadvantageously during combustion e.g.
- molten metals or the like can enter the louvers, which can lead to caking, through which the louvers gradually become clogged, so that frequent maintenance work is required.
- the present invention is based on the object of completely preventing the penetration of any substances, in particular also thin substances, into the air gaps, so that downtimes due to repairs are also avoided .
- the waste incineration plant according to FIG. 1 has a feed device 1, through which the waste (not shown) is pushed onto a roller grate 2 inclined in the transport direction.
- the roller grate 2 is constructed from a plurality of rotatable grate rollers 3 arranged side by side in the transport direction, pockets 4 being formed between adjacent grate rollers.
- the roller grate 2 is embedded in a sheet metal housing 5 divided for each grate roller. Air is supplied to these zones from the side in controllable quantities. Since all other parts of the waste incineration plant are not related to the invention, they are not described because they are known.
- Each grate roller 3 is laterally supported by a hollow shaft 6 in the corresponding sheet metal housing 5 (FIG. 2).
- the cylindrical support structure of the grate roller is located between the bearings. It essentially consists of radially extending walls or support webs 7, which are arranged at a distance from one another on the hollow shaft and on which rest the grate bar supports 8, which extend axially and are spaced apart on the circumference of the roller. Roller baskets 9 are formed between the walls 7, in which, according to a feature of the invention, air baffles 10 are arranged obliquely to the longitudinal axis direction of the roller. On the grate bar supports 8 are grate bars 11. The lines 12 and arrows 13 in FIG. 2 indicate the air path that the air is to take from the sheet metal housing 5 through the grate roller 3 into the combustion chamber 14. The other parts of a grate roller are for the Invention is immaterial, which is why they are not mentioned in the context of this description.
- a grate bar 11 according to the invention is essentially T-shaped in cross-section (FIG. 4) and consists of the transverse web 15 and the base web 16. It has the outer web wall 17 and the inner web wall 18 as well as the side walls 19 and 20, the head wall 21 and the foot wall 22, the transverse web being provided with side edge surfaces 23 and 24.
- the design of the head and foot walls is known and is insignificant to the invention, which is why it is not explained.
- a grate roller according to the invention is characterized in that it is equipped with grate bars according to the invention and the gap 25 between adjacent grate bars on the combustion chamber side at the edges 26 is approximately 2 millimeters, in particular 1 millimeter and less. It can be advantageous here if the individual rolls have different gap widths, depending on their position in the combustion zone. Here, the smallest gap width should be present in the roller, which is arranged in the main combustion zone, since there the slag is usually the most liquid, so that there is the greatest risk that the liquid slag can run into the interior.
- the rolls with the larger gap width have manufacturing advantages because they can be manufactured with greater tolerances.
- the side walls 19 and 20 lead in the upper third with an arc 28 to the edge 27, which creates a kind of pointed vault 29 between adjacent grate bars (FIG. 5). It is also advantageous if the base web 16 widens evenly upwards, the widening possibly extending to the edge 27 without an arc. The latter features support the action of the slots 25.
- the primary air supply can be carried out through the 2 mm wide and narrower grate gaps 25.
- the nozzle-shaped gap 25 increases the air speed, in particular in combination with the arch shape 29, so that care is taken to ensure that the rust roller nips 25 remain free during operation for the supply of the primary air, which is one of the most important physical components for the combustion.
- a balanced distribution of the combustion air over the entire grate surface of the individual rollers is ensured by the invention.
- gap widths of less than or equal to 1 millimeter in width counteract the dripping of the melts due to the surface tension of light metal melts.
- a certain flow rate is reached which prevents it. that the liquid slag can clog the grates or penetrate the roller.
- This flow rate depends largely on the ratio of the gap width to the distance between the base webs 16. A ratio of 1/25 to 1150 [gap width / distance] is expedient here.
- the shape of the new grate bars enables higher surface pressures so that the risk of breakage of a grate bar is minimized.
- Defective bars are known to block the rollers and cause an emergency shutdown of a system, which leads to considerable economic disadvantages.
- the width of the transverse webs 15 is preferably forty to forty-eight mm and the base webs 16 is approximately 18 mm, in particular twenty to twenty-five gaps being provided per meter of the roll length.
- the prescribed cleaning intervals according to the manufacturer's instructions are approximately 4000 hours. With the new grate roller, self-cleaning takes place through primary air supply. The cleaning time of around 250 hours per roller required according to previous experience can be omitted.
- wipers 30 made of steel bristles 31 between the adjacent rollers 3 in the pockets 4, which are fastened next to one another in a clamping rail 32.
- the length of the wipers corresponds to the length of the roller.
- the distance between the bristles 31 is preferably 10 to 15 mm, the diameter is in particular 20 to 25 mm.
- the distance between the free bristle ends and the roller surface is approximately 10 to 15 mm.
- the advantage achieved by using the bristle wipers over the known wipers formed from sheet metal is the flexibility achieved, since jamming of foreign bodies in the gap between the roller and wiper can practically no longer occur. This largely prevents damage to the roller grate bars and the roller drive.
- the greater permeability of the bristles also improves ventilation of the gusset space between the rollers.
- the invention therefore takes a path that is opposite to that of the prior art.
- the previous teaching required the widest possible gaps between the grate bars so that sufficient air can be passed through.
- the gaps are narrowed, but the shape of the grate bars ensures that the primary air is forced through the gaps at high speed, so that substances from the garbage cannot penetrate into the interior of the roller through the gaps for long periods and also cannot smear the columns.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Incineration Of Waste (AREA)
Description
Die Erfindung betrifft eine Rostwalze für einen Walzenrost einer Müllverbrennungsanlage oder dergleichen mit einer Hohlwelle und einer zylindrischen Tragkonstruktion mit Roststabträgern, auf denen kreisbogenförmige Roststäbe mit den feuerraumseitigen Walzenmantel bildenden Außenstegwandungen angeordnet sind, wobei jeder Roststab im Querschnitt im wesentlichen T-förmig mit einem Basissteg und einem Quersteg ausgebildet ist, und wobei jeweils zwischen den Querstegen zweier benachbarter Roststäbe Luftspalte zur Zufuhr von Primärluft gebildet sind.The invention relates to a grate roller for a grate of a waste incineration plant or the like with a hollow shaft and a cylindrical support structure with grate bar supports on which arc-shaped grate bars are arranged with the outer web walls forming the combustion chamber-side roll shell, each grate bar having a cross section essentially T-shaped with a base bar and one Cross bar is formed, and wherein air gaps for the supply of primary air are formed in each case between the cross bars of two adjacent grate bars.
Eine Müllverbrennungsanlage, bei der die Erfindung beispielsweise verwirklicht werden kann, besteht aus einer Aufgabevorrichtung mit einem hin- und hergehenden Schieber, mit dem der Müll durch eine Öffnung eines Füllschachtes in den Feuerraum geschoben wird. Im Feuerraum wird der Müll einer intensiven Flammenstrahlung ausgesetzt. Der Aufgabevorrichtung nachgeordnet ist im Feuerraum ein Walzenrost, der als Schrägrost ausgeführt ist und aus fünf oder sechs in einer etwa 30° in Transportrichtung geneigten Ebene hintereinander angeordneten Rostwalzen von etwa 1,5 m Durchmesser besteht, wobei zwischen den Rostwalzen sogenannte Taschen gebildet werden.A waste incineration plant in which the invention can be implemented, for example, consists of a feed device with a reciprocating slide with which the waste is pushed into the combustion chamber through an opening in a filling shaft. In the firebox, the waste is exposed to intense flame radiation. Downstream of the feed device is a roller grate in the firebox, which is designed as a sloping grate and consists of five or six grate rollers of approximately 1.5 m in diameter arranged one behind the other in a plane inclined at approximately 30 ° in the transport direction, so-called pockets being formed between the grate rollers.
Die wichtigsten Konstruktionsmerkmale der Rostwalze sind in der Regel eine beiderseits gelagerte Hohlwelle und eine zylindrische Tragkonstruktion mit radialen Wänden zur Halterung der axial sich erstreckenden Roststabträger, auf welche die aus Roststabguß gefertigten kreisbogenförmigen Roststäbe nebeneinander und hintereinander aufgereiht sind, wobei zwischen benachbarten Stäben Schlitze freibleiben. Die Roststäbe bilden den Mantel der Rostwalze bzw. den sog. Rostbelag. Sie sind aufgrund der Rotation der Rostwalze nur zeitweise der Einwirkung des Feuers ausgesetzt und können sich in den Luftzonen wieder abkühlen. Zwischen den Rostwalzen sind Leitwände angeordnet, welche die Walzen untereinander abdichten und zusammen mit den Rostwalzen Taschen bilden, in denen der Müll gewendet wird.The most important design features of the grate roller are usually a hollow shaft mounted on both sides and a cylindrical support structure with radial walls for holding the axially extending grate bar supports, on which the circular-arc grate bars made of rust bar cast are lined up next to one another and one behind the other, with slots remaining free between adjacent bars. The grate bars form the jacket of the grate roller or the so-called grate covering. Due to the rotation of the grate roller, they are only temporarily exposed to fire and can cool down again in the air zones. Guide walls are arranged between the grate rollers, which seal the rollers from one another and, together with the grate rollers, form pockets in which the waste is turned.
Der Walzenrost ist in ein für jede Rostwalze unterteiltes Blechgehäuse eingebettet. Diesen Zonen wird die Luft in regelbaren Mengen von der Seite her zugeführt. Aus den Zonen soll die Luft durch den Rostbelag und das Brennstoffmüllbett hindurch in den Feuerraum gelangen.The roller grate is embedded in a sheet metal housing divided for each grate roller. The air is supplied to these zones from the side in controllable quantities. From the zones, the air should pass through the grate and the fuel waste bed into the combustion chamber.
Noch bevor der Müll auf den Walzenrost gelangt, haben die Trocknung und die Zündung der leicht brennbaren Bestandteile begonnen. Bei der hin- und hergehenden Bewegung des Schiebers fällt der Müll als Scheibe oder Brocken von geringer Stärke in die von der ersten Leitwand und der ersten Rostwalze gebildete Tasche so lange nach unten, bis die sich langsam drehende Rostwalze das auf ihrer Oberfläche haftende Gut von unten aus der Tasche herausträgt. Es gelangt über die Rostwalze in die zweite Tasche zwischen der ersten und zweiten Walze. Dieser Vorgang wiederholt sich von Walze zu Walze und bringt eine intensive Wendung des Mülls, die schon bald zu einem guten Grundfeuer führt.Before the garbage reaches the roller grate, the drying and ignition of the easily combustible components have started. During the reciprocating movement of the slide, the garbage falls into the pocket formed by the first guide wall and the first grate roller as a slice or chunk of low thickness until the slowly rotating grate roller removes the material adhering to its surface from below out of your pocket. It passes through the grate roller into the second pocket between the first and second rollers. This process is repeated from roller to roller and brings an intensive turn of the garbage, which soon leads to a good base fire.
Die Luftverteilung wird diesem Verbrennungsbild mit den einstellbaren Unterwindzonen angepaßt. In der Trocknungs- und Zündzone ist die Luftzugabe gering. Sie erreicht ihren Höchstwert in der Zone der Hauptverbrennung und klingt in der Ausbrennzone auf einen Kleinstwert ab.The air distribution is adapted to this combustion pattern with the adjustable underwind zones. The amount of air added is low in the drying and ignition zone. It reaches its maximum in the main combustion zone and decays to a minimum in the burnout zone.
Es hat sich gezeigt, daß die vermehrten Anteile an Kunststoffen, Weißmetallen, Dachpappen. Fetten oder dergleichen Stoffe aufgrund ihrer Verbrennung im Inneren der Walzen in den sog. Walzenkörben und in den Rostdurchfalltrichtern Ablagerungen bilden, die zu Verschmierungen zwischen den Walzenstäben und Verstopfungen in den Rostdurchfalltrichtern führen. Der Walzenrost ist jedoch so konstruiert, daß die für die Verbrennung benötigte Luftmenge durch den Walzenkorb zwischen den Roststäben zu dem auf der Walze liegenden Brenngut geführt wird. Dieser konstruktiv vorgesehene Verbrennungsvorgang wird jedoch durch die Ablagerungen und Verschmierungen im Walzenkorb behindert. Hinzu kommt, daß nicht auszuschließen ist, daß die Kunststoffe, Fette, Öle oder dergleichen in konzentrierter Form auf einer Walze liegen und bei der Teilverbrennung durch die noch nicht verschmierten Rostschlitze in den Walzenkorb gelangen und die Verbrennung im Walzenkorb weiterführen. Dadurch besteht die Gefahr, daß die Walze zu brennen beginnt. Es konnte bei Reinigungsarbeiten an einer Walze bereits festgestellt werden, daß der größte Teil der Walzenkorbfläche abgebrannt war.It has been shown that the increased proportions of plastics, white metals, roofing felt. Greases or similar substances form deposits due to their combustion inside the rollers in the so-called roller baskets and in the grate diarrhea funnels, which lead to smearing between the roller bars and blockages in the grate diarrhea funnels. However, the roller grate is designed so that the amount of air required for combustion is passed through the roller cage between the grate bars to the firing material lying on the roller. However, this structurally provided combustion process is hampered by the deposits and smears in the roller cage. In addition, it cannot be ruled out that the plastics, fats, oils or the like lie in concentrated form on a roller and, during partial combustion, get into the roller basket through the not yet smeared grate slots and continue combustion in the roller basket. This creates the risk that the roller will start to burn. During cleaning work on a roller it could already be determined that most of the roller basket area had burned down.
Die Roststäbe einer bekannten Art von Rostwalzen bestehen aus einem relativ schmalen, von der Seite betrachtet bogenförmigen Steg mit zwei Seitenwandungen, einer Kopf- und einer Fußwandung sowie einer feuerseitigen Außenstegwandung. Im Bereich der Außenstegwandung sind auf jeder Seitenwandung in regelmäßigem Abstand voneinander parallel zur Richtung der Achse der Rostwalze vorspringende zahnartige Vorsprünge angeordnet, wobei jeder Vorsprung der einen Seitenwand diagonal zum Vorsprung der anderen Seitenwand positioniert ist und die Vorsprünge eines Roststabes in die Lücken zwischen den Vorsprüngen eines seitlich benachbarten anderen Roststabes greifen, wobei ein Spalt zwischen benachbarten Roststäben von etwa 5 mm Breite verbleibt. Dieser Spalt ist - wie beschrieben - zur Zuführung von Luft gedacht. In der Kopf- und Fußwandung sind die Roststäbe so geformt, daß sie in Umfangsrichtung hintereinander auf die Roststabträger gesetzt werden können und dort ortsfest lagern. Abgesehen davon, daß die Form der bekannten Roststäbe relativ kompliziert ist, bedingt sie, daß die Spalten zwischen benachbarten Roststäben nicht wesentlich schmaler gehalten werden können. Die Breite der Spalten wiederum ist mit verantwortlich dafür, daß relativ dünnflüssige, noch unverbrannte Müllbestandteile durch die Spalten in das Innere der Walze gelangen können, woraus die beschriebenen Wirkungen resultieren.The grate bars of a known type of grate rollers consist of a relatively narrow, from the side, arcuate web with two side walls, a head and a foot wall and a fire-side outer web wall. In the area of the outer web wall projecting tooth-like projections are arranged on each side wall at a regular distance from each other parallel to the direction of the axis of the grate roller, each projection of one side wall being positioned diagonally to the projection of the other side wall and the projections of a grate bar into the gaps between the projections of a grips laterally adjacent other grate bar, leaving a gap between adjacent grate bars of about 5 mm in width. As described, this gap is intended for supplying air. In the top and bottom walls, the grate bars are shaped so that they can be placed one behind the other in the circumferential direction on the grate bar supports and stored there in a stationary manner. Apart from the fact that the shape of the known grate bars is relatively complicated, it means that the gaps between adjacent grate bars cannot be kept much narrower. The width of the gaps is in turn responsible for the fact that relatively thin, still unburned waste components can get through the gaps into the interior of the roller, which results in the effects described.
Aus der DE-B-1 164 014 ist eine weitere Rostwalze für ein Walzenrost zur Müllverbrennung bekannt. Auch hier ist ebenfalls die Problematik angesprochen. daß sich bei der Verbrennung von Müll durch Anteile von leicht schmelzenden Metallen leicht Verstopfungen des Rostbelages in den Spalten zwischen den Roststäben ergeben. Bei der Drehbewegung der Walzen tropft nämlich während des Verbrennungsvorganges aus der Brenngutschicht des oberen Teils das geschmolzene Metall durch die Rostspalte in das Walzeninnere und damit auf die Rücken der unteren, den kühlenden Luftraum passierenden Roststäbe. Dabei kommt es leicht zu Verstopfungen der Rostspalte des unteren Trums, in die das Metall einfließt und dort erkaltet. Gemäß dieser Druckschrift soll nun dieses Durchfallen von geschmolzenem Metall durch das Walzeninnere hindurch auf die kühlen Roststäbe des unteren Trums unmöglich gemacht werden. Dies wird durch Auffangbleche erreicht, die derart innerhalb der Walze angeordnet sind, daß das durchtropfende Metall unmittelbar nach dem Durchtritt durch die Rostspalte des oberen Walzentrums auf die Auffangbleche auftrifft und daher nicht weiter durch das Walzeninnere hindurch in die Roststabspalte der gegenüberliegenden, unteren Roststäbe gelangen kann. Es kann daher aber nach wie vor durch die in den Walzeninnenraum eintretenden Stoffe zu Anbakkungen im Bereich der Spalte des oberen Walzentrums kommen, so daß diese mit der Zeit verstopten. Nachfolgend kann dann Verbrennungsluft nur in unzureichendem Maß zugeführt werden.Another grate roller for a roller grate for waste incineration is known from DE-B-1 164 014. The problem is also addressed here. that when garbage is burned by fractions of easily melting metals, there is a slight blockage of the rust coating in the gaps between the grate bars. During the rotation of the rollers, the molten metal drips from the firing layer of the upper part through the grate gaps into the interior of the roller and thus onto the back of the lower grate bars passing through the cooling air space during the combustion process. This easily clogs the rust gap in the lower run, into which the metal flows and cools there. According to this publication, this falling through of molten metal through the inside of the roller onto the cool grate bars of the lower run is to be made impossible. This is achieved by collecting plates, which are arranged within the roller in such a way that the dripping metal hits the collecting plates immediately after passing through the grate gaps of the upper roller center and therefore cannot pass further through the inside of the roller into the grate rod gaps of the opposite, lower grate bars . However, as a result of the substances entering the interior of the roll, it is still possible for hooks to form in the area of the gap in the upper roll center, so that they clog over time. In the following, combustion air can then only be supplied to an insufficient extent.
In der älteren, nicht vorveröffentlichten, europäischen Patentanmeldung EP-A-0 124 826 ist ein aus Rostwalzen bestehender Walzenrost für Müllverbrennungsanlagen beschrieben. Dabei besteht auch hier jede Rostwalze aus einer Hohlwelle, die Halterungen für Roststabträger besitzt. Zwischen den Roststabträgern sind im Querschnitt T-förmige Roststäbe derart eingehängt, daß sie die Ummantelung der Rostwalze bilden. Weiterhin sind auch hierbei zwischen den Roststäben Luftschlitze gebildet. Hierzu werden die aneinanderstoßenden Seitenflächen zweier benachbarter Roststäbe von Abstandhaltern auf Abstand gehalten. Dabei ist aber offensichtlich dieser Abstand, d.h. die Spalt- oder Schlitzbreite, so groß, daß - ebenso wie bei dem oben beschriebenen Stand der Technik- nachteiligerweise während der Verbrennung z.B. aufgeschmolzene Metalle oder dergleichen in die Luftschlitze eintreten können, wodurch es hier zu Anbackungen kommen kann, durch die sich die Luftschlitze allmählich zusetzen, so daß häufige Instandsetzungsarbeiten erforderlich sind. Zur Lösung dieser Problematik wird hier vorgeschlagen, die Rostwalze so auszubilden, daß die Roststäbe während des Betriebes Relativbewegungen gegeneinander ausführen können, wodurch verhindert wird, daß bereits durch die Schlitze in den Walzeninnenraum eingetretenes Material sich zwischen den Roststäben festsetzen kann.In the older, unpublished European patent application EP-A-0 124 826, a roller grate consisting of grate rollers for waste incineration plants is described. Here too, each grate roller consists of a hollow shaft that has holders for grate bar supports. Cross-sectionally T-shaped grate bars are suspended between the grate bar supports in such a way that they form the casing of the grate roller. Furthermore, air slots are formed between the grate bars. For this purpose, the abutting side surfaces of two adjacent grate bars are kept at a distance by spacers. But this distance is obviously, i.e. the gap or slot width, so large that - as in the prior art described above - disadvantageously during combustion e.g. molten metals or the like can enter the louvers, which can lead to caking, through which the louvers gradually become clogged, so that frequent maintenance work is required. To solve this problem, it is proposed here to design the grate roller so that the grate bars can perform relative movements relative to one another during operation, thereby preventing material which has already entered the interior of the roll through the slots from becoming lodged between the grate bars.
Ausgehend von diesem Stand der Technik (gemäß Art. 54(3) EPÜ) liegt der vorliegenden Erfindung demgegenüber die Aufgabe zugrunde, das Eindringen jeglicher Stoffe, insbesondere auch von dünnflüssigen Stoffen, in die Luftspalte ganz zu vermeiden, so daß auch reparaturbedingte Stillstandszeiten vermieden werden.On the basis of this prior art (in accordance with Art. 54 (3) EPC), the present invention is based on the object of completely preventing the penetration of any substances, in particular also thin substances, into the air gaps, so that downtimes due to repairs are also avoided .
Erfindungsgemäß wird dies durch Anspruch 1 gelöst. Vorteilhafte Ausbildungsformen der Erfindung werden in den Unteransprüchen 2 bis 12 gekennzeichnet.According to the invention this is solved by claim 1. Advantageous embodiments of the invention are characterized in the
Anhand der Zeichnung wird die Erfindung im folgenden beispielhaft näher erläutert. Dabei zeigen:
- Fig. 1 schematisch eine Müllverbrennungsanlage,
- Fig. 2 schematisch einen Teil einer Rostwalze,
- Fig. 3 eine Seitenansicht eines Roststabes,
- Fig. 4 einen Schnitt entlang der Linie A-B in Fig. 3,
- Fig. 5 schematisch seitlich aneinandergereihte Roststäbe,
- Fig. 6 eine Ansicht auf eine erfindungsgemäße Walze mit Abstreifer.
- 1 schematically shows a waste incineration plant,
- 2 schematically shows a part of a grate roller,
- 3 is a side view of a grate bar,
- 4 shows a section along the line AB in FIG. 3,
- 5 shows schematically side-by-side grate bars,
- Fig. 6 is a view of a roller according to the invention with a scraper.
Die Müllverbrennungsanlage nach Fig. 1 weist eine Aufgabevorrichtung 1 auf, durch die der Müll (nicht dargestellt) auf einen in Transportrichtung geneigten Walzenrost 2 geschoben wird. Der Walzenrost 2 wird aus mehreren drehbaren, in Transportrichtung nebeneinander angeordneten Rostwalzen 3 aufgebaut, wobei zwischen benachbarten Rostwalzen Taschen 4 gebildet werden. Der Walzenrost 2 ist in ein für jede Rostwalze unterteiltes Blechgehäuse 5 eingebettet. Diesen Zonen wird Luft in regelbaren Mengen von der Seite her zugeführt. Da alle übrigen Teile der Müllverbrennungsanlage nicht im Zusammenhang mit der Erfindung stehen, werden sie - weil bekannt - nicht beschrieben. Jede Rostwalze 3 lagert seitlich mit einer Hohlwelle 6 im entsprechenden Blechgehäuse 5 (Fig. 2). Zwischen den Lagerungen befindet sich die zylindrische Tragkonstruktion der Rostwalze. Sie besteht im wesentlichen aus auf der Hohlwelle im Abstand voneinander angeordneten, sich radial erstreckenden Wänden oder Stützstegen 7, auf denen die sich axial erstreckenden, am Umfang der Walze auf Abstand angeordneten Roststabträger 8 ruhen. Zwischen den Wänden 7 werden Walzenkörbe 9 gebildet, in denen nach einem Merkmal der Erfindung schräg zur Längsachsrichtung der Walze angestellte Luftleitbleche 10 angeordnet sind. Auf den Roststabträgern 8 lagern Roststäbe 11. Die Linien 12 und Pfeile 13 in Fig. 2 deuten den Luftweg an, den die Luft nehmen soll, aus dem Blechgehäuse 5 durch die Rostwalze 3 in den Feuerraum 14. Die weiteren Teile einer Rostwalze sind für die Erfindung unwesentlich, weshalb sie im Rahmen dieser Beschreibung nicht erwähnt werden.The waste incineration plant according to FIG. 1 has a feed device 1, through which the waste (not shown) is pushed onto a
Ein Roststab 11 nach der Erfindung ist im Querschnitt (Fig. 4) im wesentlichen T-förmig ausgebildet und besteht aus dem Quersteg 15 und dem Basissteg 16. Er weist die Außenstegwandung 17 und die Innenstegwandung 18 sowie die Seitenwandungen 19 und 20, die Kopfwandung 21 und die Fußwandung 22 auf, wobei der Quersteg mit Seitenkantenflächen 23 und 24 versehen ist. Die Ausbildung der Kopf- und Fußwandung ist bekannt und tür die Erfindung unwesentlich, weshalb sie nicht erläutert wird.A
Wesentlich ist, daß die Seitenkantenflächen 23 und 24 eben sind und im Querschnitt betrachtet (Fig. 4) von der feurraumseitigen Kante 26 zur Innenkante 27 hin in Richtung auf den Basissteg 16 geneigt verlaufen. Dadurch entstehen bei der seitlichen Aneinanderreihung von zwei Roststäben (Fig. 5) zum Feuerraum hin sich keilförmig verjüngende düsenförmige Schlitze 25.It is essential that the side edge surfaces 23 and 24 are flat and viewed in cross-section (FIG. 4) from the
Wesentlich ist ferner, daß aufgrund der in der Draufsicht geradlinigen Ausbildung der Kanten 26 der Querstege 15 benachbarte Roststäbe sehr eng nebeneinander gesetzt werden können. Demgemäß zeichnet sich eine erfindungsgemäße Rostwalze dadurch aus, daß sie mit erfindungsgemäßen Roststäben bestückt ist und der Spalt 25 zwischen benachbarten Roststäben feuerraumseitig an den Kanten 26 ca. 2 Millimeter, insbesondere 1 Millimeter und weniger beträgt. Hierbei kann es von Vorteil sein, wenn die einzelnen Walzen unterschiedliche Spaltbreiten besitzen, und zwar in Abhängigkeit von ihrer Lage in der Verbrennungszone. Hierbei sollte die kleinste Spaltbreite bei der Walze vorhanden sein, die in der Hauptverbrennungszone angeordnet ist, da dort die Schlakke in der Regel am flüssigsten ist, so daß bei dieser die größte Gefahr besteht, daß die flüssige Schlacke in den Innenraum laufen kann. Bei den Walzen mit der größeren Spaltbreite ergeben sich Herstellungsvorteile, da diese mit größeren Toleranzen gefertigt werden können.It is also essential that, due to the straight design of the
Besonders vorteilhaft ist zudem, daß die Seitenwandungen 19 und 20 im oberen Drittel mit einem Bogen 28 zur Kante 27 führen, wodurch eine Art Spitzgewölbe 29 zwischen benachbarten Roststäben entsteht (Fig. 5). Vorteilhaft ist dabei auch, wenn der Basissteg 16 sich nach oben hin gleichmäßig verbreitert, wobei die Verbreiterung sich ggf. ohne Bogen bis zur Kante 27 erstrecken kann. Letztere Merkmale unterstützen die Wirkung der Schlitze 25.It is also particularly advantageous that the
Mit der neu entwickelten Form der Rostwalzenstäbe kann die Primärluftzufuhr durch die 2 mm breiten und schmaleren Rostspalte 25 durchgeführt werden. Dadurch wird das Durchtropfen von Weißmetallen und Kunststoffen oder dergleichen in den Innenraum der Walze verhindert. Der düsenförmige Spalt 25 erhöht die Luftgeschwindigkeit, insbesondere in Kombination mit der Gewölbeform 29, so daß dafür Sorge getragen wird, daß die Rostwalzenspalten 25 während des Betriebes für die Zuführung der Primärluft freibleiben, die eine der wichtigsten physikalischen Komponenten für die Verbrennung ist. Eine ausgeglichene Verteilung der Verbrennungsluft über der gesamten Rostfläche der einzelnen Walzen wird durch die Erfindung gewährleistet. Insbesondere wirken Spaltweiten von kleiner/gleich 1 Millimeter Breite wegen der Oberflächenspannung von Leichtmetallschmelzen dem Durchtropfen der Schmelzen entgegen. Erfindungsgemäß wird eine bestimmte Strömungsgeschwindigkeit erreicht, die verhindert. daß die flüssige Schlacke die Roste verstopfen oder in die Walze eindringen kann. Diese Strömungsgeschwindigkeit hängt maßgeblich von dem Verhältnis der Spaltbreite zum Abstand zwischen den Basisstegen 16 ab. Zweckmäßig ist hierbei ein Verhältnis von 1/25 bis 1150 [Spaltbreite/Abstand].With the newly developed shape of the grate roller bars, the primary air supply can be carried out through the 2 mm wide and
Die Form der neuen Roststäbe ermöglicht höhere Flächendrücke, so daß die Bruchgefahr eines Roststabes minimiert ist. Defekte Stäbe blockieren bekanntlich die Walzen und verursachen ein Notabfahren einer Anlage, was zu erheblichen wirtschaftlichen Nachteilen führt. Vorzugsweise beträgt die Breite der Querstege 15 vierzig bis achtundvierzig mm und die Basisstege 16 ca. 18 mm, wobei insbesondere zwanzig bis fünfundzwanzig Spalte pro Meter der Walzenlänge vorgesehen sind.The shape of the new grate bars enables higher surface pressures so that the risk of breakage of a grate bar is minimized. Defective bars are known to block the rollers and cause an emergency shutdown of a system, which leads to considerable economic disadvantages. The width of the
Die vorgeschriebenen Reinigungsintervalle nach den Vorschriften des Herstellers betragen etwa 4000 Stunden. Mit der neuen Rostwalze findet eine Selbstreinigung durch Primärluftzuführung statt. Die nach den bisherigen Erfahrungen benötigte Reinigungszeit von etwa 250 Stunden pro Walze kann entfallen.The prescribed cleaning intervals according to the manufacturer's instructions are approximately 4000 hours. With the new grate roller, self-cleaning takes place through primary air supply. The cleaning time of around 250 hours per roller required according to previous experience can be omitted.
Wie sich insbesondere aus Fig. 6 ergibt, befinden sich zwischen den jeweils benachbarten Walzen 3 in den Taschen 4 Abstreifer 30 aus Stahlborsten 31, die in einer Klemmschiene 32 nebeneinander befestigt sind. Die Länge der Abstreifer entspricht der Walzenlänge. Der Abstand der Borsten 31 untereinander beträgt vorzugsweise 10 bis 15 mm, der Durchmesser ist insbesondere 20 bis 25 mm. Der Abstand der freien Borstenenden zur Walzenoberfläche beträgt etwa 10 bis 15 mm. Der durch den Einsatz der Borsten-Abstreifer gegenüber den bekannten, aus Blechen gebildeten Abstreifern erzielte Vorteil besteht in der erreichten Flexibilität, da ein Verklemmen von Fremdkörpern in dem Spalt zwischen Walze und Abstreifer praktisch nicht mehr auftreten kann. Hierdurch wird eine Beschädigung der Walzenroststäbe und des Walzenantriebs weitgehendst vermieden. Zudem wird durch die größere Durchlässigkeit der Borsten auch eine verbesserte Belüftung des Zwickelraums zwischen den Walzen erreicht.As can be seen in particular from FIG. 6, there are
Die Erfindung geht somit einen im Vergleich zum Stand der Technik gegensätzlichen Weg. Die bisherige Lehre verlangte möglichst breite Spalten zwischen den Roststäben, damit ausreichend Luft durchgeführt werden kann. Nach der Erfindung werden die Spalten verengt, wobei jedoch die Form der Roststäbe dafür Sorge trägt, daß die Primärluft mit hoher Geschwindigkeit durch die Spalten gedrückt wird, so daß über lange Zeiträume keine Stoffe aus dem Müll durch die Spalten in das Innere der Walze dringen können und die Spalten auch nicht verschmieren können.The invention therefore takes a path that is opposite to that of the prior art. The previous teaching required the widest possible gaps between the grate bars so that sufficient air can be passed through. According to the invention, the gaps are narrowed, but the shape of the grate bars ensures that the primary air is forced through the gaps at high speed, so that substances from the garbage cannot penetrate into the interior of the roller through the gaps for long periods and also cannot smear the columns.
Claims (12)
- Grate roller (3) for a roller grate (2) of a refuse incinerating plant or similar, having a hollow shaft (6) and a cylindrical supporting structure with grate bar bearers (8), on which arc-shaped grate bars (11) are arranged with external bar walls (17) forming the roller shell on the combustion chamber side, each grate bar (11) having an essentially T-shaped cross-section formed by a base bar (16) and a cross bar (15), and respective air gaps (25) for the supply of primary air being formed between the cross bars (15) of two adjacent grate bars (11), which air gaps have a cross-section in the shape of a nozzle such that the primary air supplied achieves a sufficiently high velocity of flow to prevent substances from penetrating the air gaps (25), wherein the air gaps (25) on the combustion chamber side have a gap width of ≦ 2 mm.
- Grate roller according to Claim 1, characterized in that the cross bar (15) of each grate bar (11) has plane lateral edge surfaces (23, 24), which, starting from the external bar wall (17) on the combustion chamber side, run inclined in the direction of the base bar (16) such that the cross-sectionally nozzle-shaped air gaps (25) taper in a wedge shape towards the combustion chamber.
- Grate roller according to Claim 1, characterized in that the cross bar (15) of each grate bar (11) has plane lateral edge surfaces (23,24) which run at right angles to the external bar wall (17) on the combustion chamber side and also run parallel to one another.
- Grate roller according to Claim 2 or 3, characterized in that the air gaps (25) on the combustion chamber side have a gap width of ≦ 1 mm.
- Grate roller according to one of Claims 1 to 3, characterized in that air-guiding baffles (10) are arranged in the supporting structure at an angle to the longitudinal axis of the roller (3).
- Grate roller according to one of Claims 1 to 5, characterized in that an ogival air inlet chamber (29) formed by the grate bars (11) is arranged in front of the wedge-shaped or nozzle-shaped gaps (25).
- Grate roller according to one of Claims 1 to 6, characterized in that the ratio of gap width to the spacing between the base bars (16) is 1/25 to 1/50.
- Grate roller according to one of Claims 1 to 7, characterized in that there are 20 to 25 gaps (25) per meter of roller length.
- Grate roller according to one of Claims 1 to 8, characterized by a scraper (30) formed of individual steel bristles (31).
- Grate roller according to one of Claims 1 to 9, characterized in that the base bar (16) of each grate bar (11) has side walls (19, 20) which in their upper third merge into the cross bar (15) by way of an arch (28).
- Grate roller according to one of Claims 1 to 10, characterized in that the base bar (16) of each grate bar (11) broadens out evenly towards the top.
- Grate roller according to one of Claims 1 to 11, characterized in that the width of the cross bar (15) of each grate bar (11) is 40 to 48 mm and that of the base bar (16) is approx. 18 mm.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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DE3346747 | 1983-12-23 | ||
DE3346747 | 1983-12-23 | ||
DE19843420020 DE3420020A1 (en) | 1983-12-23 | 1984-05-29 | RUST BAR AND RUST ROLLER FOR THE ROLL GRID e.g. A WASTE COMBUSTION PLANT OR THE LIKE |
DE3420020 | 1984-05-29 |
Publications (4)
Publication Number | Publication Date |
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EP0157920A2 EP0157920A2 (en) | 1985-10-16 |
EP0157920A3 EP0157920A3 (en) | 1987-05-20 |
EP0157920B1 EP0157920B1 (en) | 1989-07-26 |
EP0157920B2 true EP0157920B2 (en) | 1995-05-31 |
Family
ID=25816737
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84114826A Expired - Lifetime EP0157920B2 (en) | 1983-12-23 | 1984-12-06 | Roll for a roller grate, for example for a refuse burning plant or the like |
Country Status (4)
Country | Link |
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US (1) | US4610209A (en) |
EP (1) | EP0157920B2 (en) |
CS (1) | CS273159B2 (en) |
DE (2) | DE3420020A1 (en) |
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DK0396908T3 (en) * | 1989-05-10 | 1994-09-19 | Babcock Anlagen Gmbh | Grate bar and grate roller |
FR2647532B1 (en) * | 1989-05-25 | 1991-09-06 | Picard Fours | FIREPLACE ROLL, IN PARTICULAR FOR WASTE INCINERATION, WITH TUBULAR TRIM FORMED BY RINGS OF BARS SEPARATED BY MAINTAINED WIDTH BLOWING INTERVALS |
US5042401A (en) * | 1990-06-04 | 1991-08-27 | Westinghouse Electric Corp. | Water cooled rolling grate incinerator |
DE4300636C1 (en) * | 1993-01-13 | 1994-07-14 | Rbu Rolf Becker Gmbh Ingieneur | Roller grate for operating a combustion boiler |
DE4316343A1 (en) * | 1993-05-15 | 1994-11-17 | Babcock Energie Umwelt | Roller grate for incinerators |
DE4322908A1 (en) * | 1993-07-09 | 1995-01-26 | Lentjes Kraftwerkstechnik | Roller grate |
DE4322909A1 (en) * | 1993-07-09 | 1995-01-12 | Lentjes Kraftwerkstechnik | Device for feeding fuel onto a roller grate |
BR7900232U (en) * | 1999-02-03 | 2000-09-05 | Vale Do Rio Doce Co | Grid bar improvement for pelletizing and sintering furnaces |
AT410128B (en) * | 2000-11-08 | 2003-02-25 | Ferdinand Dipl Ing Tischler | RUST FOR SOLID FUELS |
DE102004011834A1 (en) * | 2004-03-09 | 2005-10-06 | Fisia Babcock Environment Gmbh | roller grate |
DE202007018707U1 (en) | 2007-04-29 | 2009-04-02 | Wvt Breiding Gmbh | Axially slidable grate bar on a roller grate, grate bar set and roller grate |
CZ304869B6 (en) * | 2013-04-05 | 2014-12-17 | Josa S.R.O. | Grate for combustion plant, particularly for burning biomass-based pellets |
CN105465801B (en) * | 2016-01-05 | 2018-05-08 | 任丘市创新采暖设备有限公司 | Two-way sub-material self-skimming rotary fire grate |
RU185323U1 (en) * | 2018-07-01 | 2018-11-30 | Сергей Петрович Семенихин | Grate |
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AT62478B (en) * | 1911-03-14 | 1913-12-10 | Augustus Francis Davis | Grate bar. |
US1961098A (en) * | 1929-03-06 | 1934-05-29 | Loraine L Denker | Mechanical stoker |
US2501763A (en) * | 1945-03-26 | 1950-03-28 | Charles T Denker | Solid fuel furnace of the rotary grate progressive feed type |
US3078839A (en) * | 1961-02-17 | 1963-02-26 | Earland R Mitchell | Dump grate |
DE1164014B (en) * | 1962-05-25 | 1964-02-27 | Ver Kesselwerke Ag | Grate roller for roller grate for waste incineration |
DE1526112A1 (en) * | 1965-10-19 | 1970-01-08 | Ver Kesselwerke Ag | Roller grate for garbage incineration very high performance |
-
1984
- 1984-05-29 DE DE19843420020 patent/DE3420020A1/en active Granted
- 1984-11-28 US US06/675,888 patent/US4610209A/en not_active Expired - Lifetime
- 1984-12-06 EP EP84114826A patent/EP0157920B2/en not_active Expired - Lifetime
- 1984-12-06 DE DE8484114826T patent/DE3479150D1/en not_active Expired
- 1984-12-19 CS CS1000684A patent/CS273159B2/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE3479150D1 (en) | 1989-08-31 |
CS273159B2 (en) | 1991-03-12 |
CS1000684A2 (en) | 1990-07-12 |
DE3420020C2 (en) | 1987-10-29 |
EP0157920B1 (en) | 1989-07-26 |
US4610209A (en) | 1986-09-09 |
EP0157920A3 (en) | 1987-05-20 |
EP0157920A2 (en) | 1985-10-16 |
DE3420020A1 (en) | 1985-07-04 |
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