EP3931488B1 - Combustion chamber for a hot gas generator of an asphalt production plant with air baffles and method for securing the air baffles - Google Patents
Combustion chamber for a hot gas generator of an asphalt production plant with air baffles and method for securing the air baffles Download PDFInfo
- Publication number
- EP3931488B1 EP3931488B1 EP19716359.5A EP19716359A EP3931488B1 EP 3931488 B1 EP3931488 B1 EP 3931488B1 EP 19716359 A EP19716359 A EP 19716359A EP 3931488 B1 EP3931488 B1 EP 3931488B1
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- EP
- European Patent Office
- Prior art keywords
- combustion chamber
- air baffles
- tabs
- longitudinal direction
- fastening
- 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.)
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- 238000002485 combustion reaction Methods 0.000 title claims description 220
- 239000010426 asphalt Substances 0.000 title claims description 23
- 238000004519 manufacturing process Methods 0.000 title claims description 23
- 238000000034 method Methods 0.000 title claims description 19
- 239000000463 material Substances 0.000 claims description 20
- 230000035515 penetration Effects 0.000 claims description 9
- 238000003466 welding Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000011707 mineral Substances 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 34
- 238000009434 installation Methods 0.000 description 4
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/08—Cooling thereof; Tube walls
- F23M5/085—Cooling thereof; Tube walls using air or other gas as the cooling medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C3/00—Combustion apparatus characterised by the shape of the combustion chamber
- F23C3/002—Combustion apparatus characterised by the shape of the combustion chamber the chamber having an elongated tubular form, e.g. for a radiant tube
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/02—Disposition of air supply not passing through burner
- F23C7/06—Disposition of air supply not passing through burner for heating the incoming air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F23M5/00—Casings; Linings; Walls
- F23M5/04—Supports for linings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/03009—Elongated tube-shaped combustion chambers
Definitions
- the present invention relates to a combustion chamber for a hot gas generator of an asphalt production plant, a hot gas generator comprising the combustion chamber, a plant for the production of asphalt comprising the hot gas generator, a use of the plant for drying and heating granular mineral and/or recycled asphalt material for asphalt production, a method for fastening air baffles in a base body of a combustion chamber for a hot gas generator and a method for connecting air baffles following one another in the longitudinal direction of the combustion chamber in a base body of a combustion chamber for a hot gas generator according to the preambles of the independent claims.
- drum dryers with rotating drying drums are used, in which a material curtain is formed from the granular material, which is permeated by a hot gas stream.
- the material to be dried and heated passes through the drying drum in the same direction as the hot gas flow (cocurrent drum dryer) or in the opposite direction to the hot gas flow (countercurrent drum dryer).
- the hot gas flow is provided by a hot gas generator, which is usually fired with fossil fuels such as natural gas, heating oil or coal dust or, for example, also with wood dust, which has a combustion chamber and a burner includes.
- the combustion chamber in turn includes a fixed base body lined with air baffles that form the radial boundaries of the combustion chamber of the combustion chamber.
- secondary air is routed between the inside of the base body and the air baffles, which cools the air baffles and is introduced into the combustion chamber at various points through defined openings in order to obtain a hot air flow that is as homogeneous as possible at a specific temperature at the outlet end of the combustion chamber.
- the air baffles are held axially displaceably on the inside of the base body with retaining plates welded onto radial webs, and the air baffles that follow one another in the longitudinal direction of the combustion chamber are each welded directly to one another or are firmly connected to one another via welded-on connecting profile pieces.
- the DE202008012971U1 discloses a combustion chamber for a hot gas generator with the features of the preamble of the first claim.
- the U.S. 5,363,642 discloses a method for connecting air baffles that follow one another in the longitudinal direction of the combustion chamber in a base body of a combustion chamber.
- a first aspect of the invention relates to a combustion chamber for a hot gas generator of an asphalt production plant.
- the combustion chamber comprises a drum-like base body with a burner end and a hot gas outlet end. Viewed in the circumferential direction of the combustion chamber, the base body is lined on its inside with several successive air baffles for secondary air, the outsides of which face the inside of the base body and the insides of which form the boundaries of the combustion chamber of the combustion chamber.
- the secondary air used is mostly hot gas or process air from associated processes, e.g. raw gas from a black material drum or chimney air.
- the air baffles can each extend in one piece over the entire length of the combustion chamber, viewed in the longitudinal direction of the combustion chamber, or there can be a plurality of air baffles following one another in the longitudinal direction of the combustion chamber, which is preferred.
- At least part of the air baffle plates is held in the base body by means of latch-bar arrangements. This is achieved in that fastening tabs protruding radially beyond the inner sides of the air baffles into the combustion chamber are interspersed with fastening bars, which create a form fit in the radial direction pointing towards the center of the combustion chamber between the fastening tabs and the inner sides of the air baffles.
- the invention makes it possible to remove individual air baffles from the combustion chamber interior without destroying components and then reinstall them, be it to replace them or to install them again, with little expenditure of time, material and work Check and/or clean the secondary air area.
- Retaining plates are preferably arranged between the fastening bars and the inner sides of the air baffle plates, through which the fastening lugs pass.
- the use of retaining plates results in the advantage that the surface generating the radial form fit with the inside of the respective air baffle can be designed independently of the fastening bar and can thus be optimized for protection against wear.
- these holding plates preferably rest without play on the inner sides of the respective air baffle plates, while on their other side they border on the respective fastening bars. In this way, a substantially vibration-free attachment of the air baffles can be achieved.
- the retaining plates have such a radial distance from these stop surfaces that the air baffles are located between these stop surfaces and can move the holding plates radially by a certain amount of play.
- This amount of play is preferably at least 3 mm, in particular at least 5 mm. With this amount of play it can be achieved that during manufacture of the combustion chamber the air baffle plates can be easily installed by axially pushing them in from the hot gas outlet end of the combustion chamber. This also makes it possible to prevent or at least significantly reduce stresses in the event of manufacturing inaccuracies and thermal expansion.
- the fastening tabs are located between opposing delimitations of the air baffle plates running in the longitudinal direction of the combustion chamber Combustion chamber inside, the respective fastening bars and / or retaining plates overlap these limitations to form the radial form fit. In this way, free axial displaceability of the air baffle plates can be ensured in a simple and reliable manner.
- fastening tabs arranged between the boundaries of the air baffle plates running in the longitudinal direction of the combustion chamber are interspersed with the fastening bars in the circumferential direction of the combustion chamber.
- the tabs can be made very flat in the circumferential direction of the combustion chamber and the distance between the boundaries of the air baffle plates can be chosen to be correspondingly very small.
- the base body of the combustion chamber is lined on its inside with a plurality of successive air baffles both in the circumferential direction of the combustion chamber and in the longitudinal direction of the combustion chamber.
- the air baffles therefore do not extend in one piece over the entire length of the combustion chamber, viewed in the longitudinal direction of the combustion chamber, but rather several air baffles follow one another in the longitudinal direction of the combustion chamber. This has the advantage that the installation/dismantling of the air baffle plates is simplified and only certain areas can be removed in a targeted manner for replacement or control purposes.
- the air baffles following one another in the longitudinal direction of the combustion chamber are connected to one another so that they expand together during heating and cooling and also contract together again without significant gaps occurring between them.
- This is advantageously done by means of lug-bar arrangements such that connecting lugs are formed on the opposite delimitations of the successive air baffle plates in the longitudinal direction of the combustion chamber, which project radially into the combustion chamber and enforce a common retaining plate, which creates a form fit in the longitudinal direction of the combustion chamber between the connecting straps.
- the free ends of the tabs, which emerge from the side of the retaining plate facing the combustion chamber, are penetrated by a connecting bar which secures the retaining plate.
- the connecting lugs which pass through a common retaining plate, lie on top of one another, as seen in the direction in which the connecting bar is pushed through.
- the connecting lugs which pass through a common retaining plate, lie next to one another as seen in the direction of the connecting bar.
- the common retaining plate can be secured with exactly one connecting bar, which passes through each of the connecting straps penetrating the retaining plate, or with several connecting bars, which each pass through each of the connecting straps penetrating the holding plate, or only some of them. Depending on the installation situation, one or the other variant may be more preferable.
- connecting lugs which pass through a common retaining plate, are next to one another as seen in the direction of the connecting bar, it is provided, for example, that they together form a passage opening for a connecting bar. In this way, the desired connection can also be produced with such arrangements of the connecting straps with a single connecting bar.
- the connecting tabs are advantageously penetrated by the connecting bars in the longitudinal direction of the combustion chamber or in the circumferential direction of the combustion chamber. Depending on the installation situation, one or the other variant may be more preferable.
- the fastening bars and/or connecting bars are preferably designed in such a way that they strike at least one of the fastening straps or connecting straps with a stop face in a form-fitting manner in the direction of penetration. In this way, assembly is made easier and a precisely defined installation position can be ensured. In addition, any securing of the bolts is only necessary at one end of the bolts as a result of this configuration.
- Such a securing of the fastening bolts and/or connecting bolts is advantageously carried out with a material application after the assembly of the bolt exclusively on its surface by welding, in particular by means of one or by means of several welding points, which positively secure the bolt against removal from the intended position.
- Such a securing method has the advantage over welding with the tabs and/or retaining plates that the material applied to remove the bolt can be simply ground away with a grinding machine and without material removal on other components and the bolt can then be used again.
- the air baffle plates preferably have a profile running in the longitudinal direction of the combustion chamber, so that on their outsides they form flow channels for the secondary air that extend in the longitudinal direction of the combustion chamber.
- At least some of the air baffles that follow one another, viewed in the longitudinal direction of the combustion chamber, are designed in such a way, for example by means of a stepped profile, that their facing one another Limitations to the end of the hot air outlet pointing out outlet openings form for secondary air from the respective flow channel extending behind it.
- the air baffles that follow one another as seen in the longitudinal direction of the combustion chamber, the boundaries of which face one another form the air outlet openings pointing towards the hot air outlet end, are preferably connected to one another by means of latch-bar arrangements in such a way that at the opposite boundaries of the air baffles in the longitudinal direction of the combustion chamber each connection tabs are formed, which protrude into the combustion chamber.
- These connecting shackles each pass through a common holding plate, which creates a form fit in the longitudinal direction of the combustion chamber between the connecting shackles passing through it and is each secured by means of a connecting bar which passes through the connecting shackles on the side of the holding plate facing the combustion chamber.
- the connecting lugs which each pass through the common retaining plate, lie next to each other as seen in the direction of penetration of the connecting bar and together form a passage opening for a single common connecting bar which passes through the connecting lugs in the circumferential direction of the combustion chamber. Realizing the connection of the air baffles in this way requires particularly little space in the circumferential direction of the combustion chamber and therefore offers maximum design freedom for the formation of the air outlet openings.
- At least a part of the combustor longitudinal direction on top of each other following air baffles is profiled in such a way that their mutually facing boundaries adjoin each other essentially steplessly.
- at least some of these air baffles have air outlet openings pointing toward the combustion chamber for secondary air from a flow channel extending behind them.
- These air baffles which have air outlet openings pointing towards the combustion chamber, are preferably arranged between the hot gas outlet end and the air outlet openings pointing towards the hot air outlet end, viewed in the longitudinal direction of the combustion chamber. It has been shown that a particularly uniform temperature of the hot gas stream exiting the combustion chamber can be achieved in this way.
- the air baffles following one another seen in the longitudinal direction of the combustion chamber which are profiled in such a way that their mutually facing boundaries adjoin one another in an essentially stepless manner, are preferably connected to one another by means of latch-bar arrangements.
- the connection is designed in such a way that connecting lugs are formed in the central areas on the opposite delimitations of the air baffle plates in the longitudinal direction of the combustion chamber, which protrude into the combustion chamber.
- These connecting lugs each pass through a common retaining plate, which creates a form fit in the longitudinal direction of the combustion chamber between the respective connecting lugs.
- the retaining plate is secured by means of a connecting bar, which passes through the connecting lugs on the side of the retaining plate facing the combustion chamber.
- the connecting tabs which each pass through the common retaining plate, are preferably located one above the other as seen in the direction of penetration of the connecting bar and are passed through by a common connecting bar in the longitudinal direction of the combustion chamber.
- This type of connection of the air baffles that follow one another in the longitudinal direction of the combustion chamber is special easy to manufacture and is preferably realized in the middle of the opposite borders of the same. This results in the advantage that a single tongue-and-bar connection is sufficient for connecting two air baffles that follow one another in the longitudinal direction of the combustion chamber.
- a second aspect of the invention relates to a hot gas generator for an asphalt production plant, which has a combustion chamber according to the first aspect of the invention and a burner for generating a hot gas flow through the combustion chamber.
- a third aspect of the invention relates to a plant for the production of asphalt, comprising a hot gas generator according to the second aspect of the invention and a drum dryer, preferably a countercurrent drum dryer, which is or can be charged with hot gas by the hot gas generator.
- a fourth aspect of the invention relates to the use of the plant according to the third aspect of the invention for drying and heating granular mineral and/or recycled asphalt material in asphalt production.
- a fifth aspect of the invention relates to a method for fastening air baffles in a base body of a combustion chamber for a hot gas generator.
- the starting point here is a drum-like base body of a combustion chamber for a hot gas generator, in which fastening tabs protruding radially inward are arranged for fastening air baffles.
- Air supply plates are arranged in this base body in such a way that when the combustion chamber is finished as intended, they form the radial boundaries of the combustion chamber of the combustion chamber, with the fastening lugs being arranged between opposing boundaries of the air baffles and/or passing through the air baffles, and with the fastening lugs protrude with their free ends radially over the air baffles into the combustion chamber.
- the free ends of the fastening straps protruding into the combustion chamber are interspersed with fastening bars in such a way that the fastening bars create a form fit in the radial direction between the fastening straps and the air baffle plates.
- the free ends of the fastening tabs have passage openings into which the fastening bars are pushed.
- the invention makes it possible to remove individual air baffles from the interior of the combustion chamber without destroying components and then reinstall them with little expenditure of time, material and work, whether to replace them or to check and/or clean the Carry out secondary air area.
- the air baffles are arranged in the base body in such a way that the fastening tabs protrude into the combustion chamber between opposing boundaries of the air baffles running in the longitudinal direction of the combustion chamber, with the respective fastening bars and/or any existing retaining plates overlapping these boundaries to form the radial form fit.
- free axial displaceability of the air baffle plates can be ensured in a simple and reliable manner.
- fastening tabs arranged between the boundaries of the air baffle plates running in the longitudinal direction of the combustion chamber are interspersed with the fastening bars in the circumferential direction of the combustion chamber.
- the tabs can be made very flat in the circumferential direction of the combustion chamber and the distance between the boundaries of the air baffle plates can be chosen to be correspondingly very small.
- retaining plates which are penetrated by the fastening tabs.
- the use of retaining plates results in the advantage that the surface generating the radial form fit with the inside of the respective air baffle can be designed independently of the fastening bar and can thus be optimized for protection against wear.
- the retaining plates are arranged in such a way that they preferably rest without play on the insides of the respective air baffle plates, while on their other side they adjoin the respective fastening bars. In this way, a substantially vibration-free attachment of the air baffles can be achieved.
- stop surfaces are present on the inside of the base body, against which the air baffle plates, pointing outwards in the radial direction, strike or can strike.
- the holding plates are arranged at such a radial distance from these abutment surfaces that the air baffles can move radially by a certain amount of play between these abutment surfaces and the holding plates.
- This amount of play is preferably at least 3 mm, in particular at least 5 mm. With this amount of play it can be achieved that during manufacture of the combustion chamber the air baffle plates can be easily installed by axially pushing them in from the hot gas outlet end of the combustion chamber. This also makes it possible to prevent or at least significantly reduce stresses in the event of manufacturing inaccuracies and thermal expansion.
- a sixth aspect of the invention relates to a method for connecting air baffles that follow one another in the longitudinal direction of the combustion chamber in a base body of a combustion chamber for a hot gas generator.
- air baffle plates are provided, which have connecting lugs that extend from the end to form a combustion chamber delimitation of the combustion chamber protrude from the intended surface of the respective air baffle.
- air baffles are arranged in a base body of a combustion chamber for a hot gas generator in such a way that the air baffles form the radial boundaries of the combustion space of the combustion chamber when the combustion chamber is finished as intended.
- the end-side connecting tabs of air baffles following one another in the longitudinal direction of the combustion chamber are opposite and/or adjoin one another.
- a retaining plate with a through-opening is arranged on the respective opposite and/or adjoining connecting lugs in such a way that the connecting lugs pass through the through-opening of the retaining plate and protrude with their free ends beyond the side of the retaining plate facing the combustion chamber into the combustion chamber.
- the retaining plates each produce a form fit in the longitudinal direction of the combustion chamber between the connecting straps.
- the holding plates are each secured by means of a connecting bar which passes through at least one of the connecting lugs on the side of the holding plate facing the combustion chamber.
- the invention makes it possible to remove individual air baffles from the interior of the combustion chamber without destroying components and then reinstall them with little expenditure of time, material and work, whether to replace them or to check and/or clean the Carry out secondary air area.
- the fastening and/or connecting bars are preferably positively secured against removal from the as intended position secured.
- a securing method has the advantage over welding with the tabs and/or retaining plates that the material applied to remove the bolt can be simply ground away with a grinding machine and without destroying or impairing other components and the bolt can then also be used again.
- FIG. 1 shows a longitudinal section through the hot gas generator and the drum dryer of an asphalt production plant 1 according to the invention in a perspective view obliquely from above.
- the system 1 comprises a hot gas generator 2 according to the invention and a countercurrent drum dryer 3 for drying and heating granular mineral and/or recycled asphalt material for asphalt production, the internal structure of which is not shown in detail.
- the combustion chamber 4 comprises a drum-like base body 6 with a burner end A and a hot gas outlet end B.
- the base body 6 is seen on its inside both in the circumferential direction of the combustion chamber and in the longitudinal direction S of the combustion chamber, with a plurality of successive air baffles 7 (Only some provided with reference numbers) lined, the outside of the inside of the base body 6 facing are and the insides of which form the boundaries of the combustion chamber 8 of the combustion chamber 4 .
- the air baffles 7 have a profile running in the longitudinal direction S of the combustion chamber, as a result of which they form flow channels for secondary air that extend in the longitudinal direction S of the combustion chamber on their outer sides.
- retaining plates 12 are arranged between the fastening bars 11 and the insides of the air baffles 7 , through which the fastening lugs 10 pass.
- the inside of the base body 6 forms abutment surfaces 22 against which the air baffle plates 7 abut or can abut in the radial direction outwards, and the holding plates 12 have such a distance a have to these stop surfaces 22 that the air baffles 7 can move between these stop surfaces 22 and the retaining plates 12 radially by the amount of play d.
- This play dimension d is about 5 mm in the present case.
- the fastening lugs 10 protrude into the combustion chamber 8 between opposite delimitations 13 of the air baffle plates 7 running in the longitudinal direction S of the combustion chamber, and the fastening bars 11 and retaining plates 12 overlap these delimitations 13.
- the fastening bars 11 thereby penetrate the fastening lugs 10 in the circumferential direction of the combustion chamber.
- the air baffle plates 7 forming an air outlet opening 15 are connected to one another by means of two latch-bar arrangements 9b, so that they can only move axially together in the longitudinal direction S of the combustion chamber in the event of thermal expansion or contraction.
- these tab-bar assemblies 9b are each realized in that at the opposite boundaries in the longitudinal direction S of the combustion chamber 14 of the successive air baffles 7 in the edge regions connecting lugs 16a, 16b are formed, which protrude into the combustion chamber 8 and pass through a common retaining plate 17 which creates a form fit in the longitudinal direction S of the combustion chamber between the connecting lugs 16a, 16b.
- the holding plate 17 is secured by means of a connecting bar 18 which passes through a through-opening formed jointly by the two connecting lugs 16a, 16b on the side of the holding plate 17 which faces the combustion chamber 8 .
- the connecting lugs 16a, 16b lie next to each other as seen in the direction of penetration of the connecting bar 18 and each form one half of the through-opening for the connecting bar 18, which passes through the through-opening formed by the connecting lugs 16a, 16b in the circumferential direction of the combustion chamber.
- the air baffles 7 that follow one another as seen in the longitudinal direction S of the combustion chamber which form the fourth to sixth circumferential row of air baffles 7 seen downstream from the burner end A, are each connected to one another by means of exactly one latch-bar arrangement 9c, so that they only move axially during thermal expansion or contraction can move together in the longitudinal direction S of the combustion chamber.
- this latch-bar arrangement 9c is realized in that at the opposite boundaries 14 of the successive air baffles in the longitudinal direction S of the combustion chamber 7 in the middle of these boundaries 14 connecting lugs 21a, 21b are formed, which protrude into the combustion chamber 8 and pass through a common retaining plate 17, which creates a form fit in the longitudinal direction S of the combustion chamber between the connecting lugs 21a, 21b.
- the holding plate 17 is secured by means of a connecting bolt 18 which passes through both connecting lugs 21a, 21b.
- the connecting tabs 21a, 21b lie one above the other as seen in the direction of penetration of the connecting bar 18 and are penetrated by the connecting bar 18 in the longitudinal direction S of the combustion chamber.
- All fastening and connecting bolts 11, 18 are stepped, so that they strike positively in the direction of penetration with stop surfaces 23 formed by the step on fastening lug 10, on connecting lug 21a or on the two connecting lugs 16a, 16b.
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Gas Burners (AREA)
- Road Paving Machines (AREA)
- Working-Up Tar And Pitch (AREA)
- Incineration Of Waste (AREA)
Description
Die vorliegende Erfindung betrifft eine Brennkammer für einen Heissgaserzeuger einer Asphaltproduktionsanlage, einen Heissgaserzeuger umfassend die Brennkammer, eine Anlage zur Produktion von Asphalt umfassend den Heissgaserzeuger, eine Verwendung der Anlage zur Trocknung und Erhitzung von granulatförmigem Mineral-und/oder Recyclingasphaltmaterial für die Asphaltherstellung, ein Verfahren zur Befestigung von Luftleitblechen in einem Grundkörper einer Brennkammer für einen Heissgaserzeuger und ein Verfahren zum Verbinden von in Brennkammer-Längsrichtung aufeinander folgenden Luftleitblechen in einem Grundkörper einer Brennkammer für einen Heissgaserzeuger gemäss den Oberbegriffen der unabhängigen Patentansprüche.The present invention relates to a combustion chamber for a hot gas generator of an asphalt production plant, a hot gas generator comprising the combustion chamber, a plant for the production of asphalt comprising the hot gas generator, a use of the plant for drying and heating granular mineral and/or recycled asphalt material for asphalt production, a method for fastening air baffles in a base body of a combustion chamber for a hot gas generator and a method for connecting air baffles following one another in the longitudinal direction of the combustion chamber in a base body of a combustion chamber for a hot gas generator according to the preambles of the independent claims.
Bei Anlagen für die Trocknung und Erhitzung von granulatförmigem Mineral- und/oder Recyclingasphaltmaterial für die Asphaltherstellung kommen Trommeltrockner mit rotierenden Trockentrommeln zum Einsatz, in denen ein Materialvorhang aus dem granulatförmigen Material gebildet wird, welcher von einem Heissgasstrom durchsetzt wird. Dabei durchläuft das zu trocknende und zu erhitzende Material die Trockentrommel in der gleichen Richtung wie der Heissgasstrom (Gleichstrom-Trommeltrockner) oder in einer entgegengesetzten Richtung wie der Heissgasstrom (Gegenstrom-Trommeltrockner).In systems for drying and heating granular mineral and/or recycling asphalt material for asphalt production, drum dryers with rotating drying drums are used, in which a material curtain is formed from the granular material, which is permeated by a hot gas stream. The material to be dried and heated passes through the drying drum in the same direction as the hot gas flow (cocurrent drum dryer) or in the opposite direction to the hot gas flow (countercurrent drum dryer).
Der Heissgasstrom wird von einem zumeist mit fossilen Brennstoffen wie Erdgas, Heizöl oder Kohlenstaub oder z.B. auch mit Holzstaub befeuerten Heissgaserzeuger bereitgestellt, welcher eine Brennkammer und einen Brenner umfasst. Die Brennkammer wiederum umfasst einen feststehenden Grundkörper, welcher mit Luftleitblechen ausgekleidet ist, welche die radialen Begrenzungen des Brennraumes der Brennkammer bilden. Zwischen der Innenseite des Grundkörpers und den Luftleitblechen wird im bestimmungsgemässen Betrieb Sekundärluft geführt, welche die Luftleitbleche kühlt und an verschiedenen Stellen über definierte Öffnungen in den Brennraum eingeleitet wird, um am Austrittsende der Brennkammer einen möglichst homogenen Heissluftstrom mit einer bestimmten Temperatur zu erhalten.The hot gas flow is provided by a hot gas generator, which is usually fired with fossil fuels such as natural gas, heating oil or coal dust or, for example, also with wood dust, which has a combustion chamber and a burner includes. The combustion chamber in turn includes a fixed base body lined with air baffles that form the radial boundaries of the combustion chamber of the combustion chamber. In normal operation, secondary air is routed between the inside of the base body and the air baffles, which cools the air baffles and is introduced into the combustion chamber at various points through defined openings in order to obtain a hot air flow that is as homogeneous as possible at a specific temperature at the outlet end of the combustion chamber.
Die Luftleitbleche sind bei den heute bekannten gattungsgemässen Brennkammern mit auf radiale Stege aufgeschweissten Halteplatten axialverschieblich auf der Innenseite des Grundkörpers gehalten, und die in Brennkammer-Längsrichtung aufeinander folgenden Luftleitbleche sind jeweils direkt miteinander verschweisst oder über aufgeschweisste Verbindungsprofilstücke fest miteinander verbunden.In the combustion chambers of this type known today, the air baffles are held axially displaceably on the inside of the base body with retaining plates welded onto radial webs, and the air baffles that follow one another in the longitudinal direction of the combustion chamber are each welded directly to one another or are firmly connected to one another via welded-on connecting profile pieces.
Nach längerem Betrieb der Brennkammer kann es erforderlich sein, einzelne Luftleitbleche auszutauschen. Auch kann sich mit der Zeit Material im Sekundärluftbereich zwischen der Innenseite des Grundkörpers und den Luftleitblechen ablagern, was zu einer Beeinträchtigung der Luftführung und damit des Betriebs führen kann und eine regelmässige Kontrolle/Reinigung dieses Bereichs erforderlich macht. Ein Ersatz einzelner Luftleitbleche und die Kontrolle und/oder Reinigung des Sekundärluftbereichs ist bei den heutigen Brennkammern jedoch sehr zeit- und arbeitsintensiv, weil es nicht möglich ist, einzelne Luftleitbleche auf einfache und sichere Weise zu entfernen und anschliessend wieder zu installieren.After prolonged operation of the combustion chamber, it may be necessary to replace individual air baffles. Over time, material can also build up in the secondary air area between the inside of the base body and the air baffles, which can impair the air flow and thus the operation and make regular checking/cleaning of this area necessary. However, replacing individual air baffles and inspecting and/or cleaning the secondary air area in today's combustors is very time consuming and labor intensive because it is not possible to easily and safely remove and then reinstall individual air baffles.
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Es stellt sich daher die Aufgabe, technische Lösungen zur Verfügung zu stellen, welche die zuvor genannten Nachteile des Standes der Technik nicht aufweisen oder zumindest teilweise vermeiden.It is therefore the task of technical to provide solutions that meet the aforesaid Do not have the disadvantages of the prior art or at least partially avoid them.
Diese Aufgabe wird durch die Gegenstände der unabhängigen Patentansprüche gelöst.This object is solved by the subject matter of the independent patent claims.
Gemäss diesen betrifft ein erster Aspekt der Erfindung eine Brennkammer für einen Heissgaserzeuger einer Asphaltproduktionsanlage. Die Brennkammer umfasst einen trommelartigen Grundkörper mit einem Brennerende und einem Heissgasaustrittsende. Auf seiner Innenseite ist der Grundkörper in Brennkammer-Umfangsrichtung gesehen mit mehreren aufeinander folgenden Luftleitblechen für Sekundärluft ausgekleidet, deren Aussenseiten der Innenseite des Grundkörpers zugewandt sind und deren Innenseiten die Begrenzungen des Brennraumes der Brennkammer bilden.According to these, a first aspect of the invention relates to a combustion chamber for a hot gas generator of an asphalt production plant. The combustion chamber comprises a drum-like base body with a burner end and a hot gas outlet end. Viewed in the circumferential direction of the combustion chamber, the base body is lined on its inside with several successive air baffles for secondary air, the outsides of which face the inside of the base body and the insides of which form the boundaries of the combustion chamber of the combustion chamber.
Als Sekundärluft wird bei gattungsgemässen Brennkammern zumeist Heissgas bzw. Prozessluft aus verbundenen Prozessen verwendet, z.B. Rohgas aus einer Schwarzmaterial-Trommel oder Kaminluft.In combustion chambers of this type, the secondary air used is mostly hot gas or process air from associated processes, e.g. raw gas from a black material drum or chimney air.
Die Luftleitbleche können sich in Brennkammer-Längsrichtung gesehen jeweils einstückig über die gesamte Länge der Brennkammer erstrecken, oder es können in Brennkammer-Längsrichtung mehrere aufeinander folgende Luftleitbleche vorhanden sein, was bevorzugt ist.The air baffles can each extend in one piece over the entire length of the combustion chamber, viewed in the longitudinal direction of the combustion chamber, or there can be a plurality of air baffles following one another in the longitudinal direction of the combustion chamber, which is preferred.
Zumindest ein Teil der Luftleitbleche ist mittels Lasche-Riegel-Anordnungen im Grundkörper gehalten. Dies ist dadurch realisiert, dass radial über die Innenseiten der Luftleitbleche in den Brennraum vorstehende Befestigungslaschen von Befestigungsriegeln durchsetzt sind, welche einen Formschluss in radialer Richtung zum Brennkammerzentrum weisend zwischen den Befestigungslaschen und den Innenseiten der Luftleitbleche erzeugen.At least part of the air baffle plates is held in the base body by means of latch-bar arrangements. This is achieved in that fastening tabs protruding radially beyond the inner sides of the air baffles into the combustion chamber are interspersed with fastening bars, which create a form fit in the radial direction pointing towards the center of the combustion chamber between the fastening tabs and the inner sides of the air baffles.
Durch die Erfindung wird es möglich, mit geringem Zeit-, Material- und Arbeitsaufwand einzelne Luftleitbleche vom Brennkammer-Innenraum her ohne Zerstörung von Bauteilen zu entfernen und anschliessend wieder zu installieren, sei es um diese zu ersetzen oder um eine Kontrolle und/oder Reinigung des Sekundärluftbereichs durchzuführen.The invention makes it possible to remove individual air baffles from the combustion chamber interior without destroying components and then reinstall them, be it to replace them or to install them again, with little expenditure of time, material and work Check and/or clean the secondary air area.
Bevorzugterweise sind zwischen den Befestigungsriegeln und den Innenseiten der Luftleitbleche jeweils Halteplatten angeordnet, welche von den Befestigungslaschen durchsetzt sind. Durch die Verwendung von Halteplatten ergibt sich der Vorteil, dass die den radialen Formschluss mit der Innenseite des jeweiligen Luftleitbleches erzeugende Fläche unabhängig vom Befestigungsriegel ausgestaltet werden kann und dadurch auf Verschleissschutz optimiert werden kann.Retaining plates are preferably arranged between the fastening bars and the inner sides of the air baffle plates, through which the fastening lugs pass. The use of retaining plates results in the advantage that the surface generating the radial form fit with the inside of the respective air baffle can be designed independently of the fastening bar and can thus be optimized for protection against wear.
In einer ersten bevorzugten Variante liegen diese Halteplatten bevorzugterweise spielfrei auf den Innenseiten der jeweiligen Luftleitbleche auf, während sie auf ihrer anderen Seite an den jeweiligen Befestigungsriegel angrenzen. Hierdurch lässt sich eine im Wesentlichen vibrationsfreie Befestigung der Luftleitbleche erreichen.In a first preferred variant, these holding plates preferably rest without play on the inner sides of the respective air baffle plates, while on their other side they border on the respective fastening bars. In this way, a substantially vibration-free attachment of the air baffles can be achieved.
In einer zweiten bevorzugten Variante sind auf der Innenseite des Grundkörpers Anschlagflächen vorhanden, an welche die Luftleitbleche in radialer Richtung nach aussen zeigend anschlagen oder anschlagen können, und die Halteplatten weisen einen derartigen radialen Abstand zu diesen Anschlagflächen auf, dass sich die Luftleitbleche zwischen diesen Anschlagflächen und den Halteplatten radial um ein bestimmtes Spielmass bewegen können. Dieses Spielmass beträgt bevorzugterweise mindestens 3 mm, insbesondere mindestens 5 mm. Mit diesem Spielmass kann erreicht werden, dass bei der Herstellung der Brennkammer eine einfache Montage der Luftleitbleche durch axiales Einschieben vom Heissgasaustrittsende der Brennkammer her möglich ist. Auch lassen sich hierdurch Spannungen bei Fertigungsungenauigkeiten und Wärmeausdehnungen verhindern oder zumindest deutlich reduzieren.In a second preferred variant, there are stop surfaces on the inside of the base body, against which the air baffles hit or can hit, pointing outwards in the radial direction, and the retaining plates have such a radial distance from these stop surfaces that the air baffles are located between these stop surfaces and can move the holding plates radially by a certain amount of play. This amount of play is preferably at least 3 mm, in particular at least 5 mm. With this amount of play it can be achieved that during manufacture of the combustion chamber the air baffle plates can be easily installed by axially pushing them in from the hot gas outlet end of the combustion chamber. This also makes it possible to prevent or at least significantly reduce stresses in the event of manufacturing inaccuracies and thermal expansion.
Mit Vorteil stehen die Befestigungslaschen zwischen in Brennkammer-Längsrichtung verlaufenden sich gegenüberliegenden Begrenzungen der Luftleitbleche in den Brennraum hinein, wobei die jeweiligen Befestigungsriegel und/oder Halteplatten diese Begrenzungen zur Bildung des radialen Formschlusses übergreifen. Auf diese Weise lässt sich eine freie axiale Verschiebbarkeit der Luftleitbleche auf einfache und sichere Weise gewährleisten.Advantageously, the fastening tabs are located between opposing delimitations of the air baffle plates running in the longitudinal direction of the combustion chamber Combustion chamber inside, the respective fastening bars and / or retaining plates overlap these limitations to form the radial form fit. In this way, free axial displaceability of the air baffle plates can be ensured in a simple and reliable manner.
Dabei ist es bevorzugt, dass die zwischen in Brennkammer-Längsrichtung verlaufenden Begrenzungen der Luftleitbleche angeordneten Befestigungslaschen in Brennkammer-Umfangsrichtung mit den Befestigungsriegeln durchsetzt sind. Auf diese Weise können die Laschen in Brennkammer-Umfangsrichtung sehr flach ausgebildet werden und der Abstand zwischen den Begrenzungen der Luftleitbleche entsprechend sehr klein gewählt werden.It is preferred that the fastening tabs arranged between the boundaries of the air baffle plates running in the longitudinal direction of the combustion chamber are interspersed with the fastening bars in the circumferential direction of the combustion chamber. In this way, the tabs can be made very flat in the circumferential direction of the combustion chamber and the distance between the boundaries of the air baffle plates can be chosen to be correspondingly very small.
In einer bevorzugten Ausführungsform ist der Grundkörper der Brennkammer auf seiner Innenseite sowohl in Brennkammer-Umfangsrichtung als auch in Brennkammer-Längsrichtung gesehen mit mehreren aufeinander folgenden Luftleitblechen ausgekleidet. Die Luftleitbleche erstrecken sich also in Brennkammer-Längsrichtung gesehen nicht einstückig über die gesamte Länger der Brennkammer, sondern es folgen in Brennkammer-Längsrichtung mehrere Luftleitbleche aufeinander. Hierdurch ergibt sich der Vorteil, dass die Installation/Demontage der Luftleitbleche vereinfacht wird und zu Ersatz- oder Kontrollzwecken gezielt nur bestimmte Bereiche entfernt werden können.In a preferred embodiment, the base body of the combustion chamber is lined on its inside with a plurality of successive air baffles both in the circumferential direction of the combustion chamber and in the longitudinal direction of the combustion chamber. The air baffles therefore do not extend in one piece over the entire length of the combustion chamber, viewed in the longitudinal direction of the combustion chamber, but rather several air baffles follow one another in the longitudinal direction of the combustion chamber. This has the advantage that the installation/dismantling of the air baffle plates is simplified and only certain areas can be removed in a targeted manner for replacement or control purposes.
Dabei ist es bei dieser Ausführungsform weiter bevorzugt, dass die in Brennkammer-Längsrichtung aufeinander folgenden Luftleitbleche miteinander verbunden sind, damit sich diese beim Aufheizen und Abkühlen gemeinsam ausdehnen und auch wieder gemeinsam zusammenziehen, ohne dass nennenswerte Spalte zwischen diesen entstehen. Mit Vorteil geschieht dies mittels Lasche-Riegel-Anordnungen derart, dass an den sich in Brennkammer-Längsrichtung gegenüberliegenden Begrenzungen der aufeinander folgenden Luftleitbleche Verbindungslaschen gebildet sind, welche radial in den Brennraum vorstehen und eine gemeinsame Halteplatte durchsetzen, die einen Formschluss in Brennkammer-Längsrichtung zwischen den Verbindungslaschen erzeugt. Die freien Enden der Laschen, welche auf der dem Brennraum zugewandten Seite der Halteplatte aus dieser austreten, werden von einem Verbindungsriegel durchsetzt, welcher die Halteplatte sichert.It is further preferred in this embodiment that the air baffles following one another in the longitudinal direction of the combustion chamber are connected to one another so that they expand together during heating and cooling and also contract together again without significant gaps occurring between them. This is advantageously done by means of lug-bar arrangements such that connecting lugs are formed on the opposite delimitations of the successive air baffle plates in the longitudinal direction of the combustion chamber, which project radially into the combustion chamber and enforce a common retaining plate, which creates a form fit in the longitudinal direction of the combustion chamber between the connecting straps. The free ends of the tabs, which emerge from the side of the retaining plate facing the combustion chamber, are penetrated by a connecting bar which secures the retaining plate.
Hierdurch wird es möglich, mit geringem Zeit-, Material- und Arbeitsaufwand die Verbindung zwischen Luftleitblechen vom Brennkammer-Innenraum her ohne Zerstörung von Bauteilen aufzuheben und anschliessend wieder herzustellen, sei es um einzelne Luftleitbleche zu ersetzen oder um eine Kontrolle und/oder Reinigung des Sekundärluftbereichs durchzuführen.This makes it possible to disconnect and then restore the connection between the air baffles from the combustion chamber interior without destroying components with little expenditure of time, material and work, be it to replace individual air baffles or to check and/or clean the secondary air area to perform.
In einer ersten bevorzugten Variante liegen die Verbindungslaschen, welche eine gemeinsame Halteplatte durchsetzen, in Durchsetzungsrichtung des Verbindungsriegels gesehen übereinander.In a first preferred variant, the connecting lugs, which pass through a common retaining plate, lie on top of one another, as seen in the direction in which the connecting bar is pushed through.
In einer zweiten bevorzugten Variante liegen die Verbindungslaschen, welche eine gemeinsame Halteplatte durchsetzen, in Durchsetzungsrichtung des Verbindungsriegels gesehen nebeneinander.In a second preferred variant, the connecting lugs, which pass through a common retaining plate, lie next to one another as seen in the direction of the connecting bar.
Dabei kann die gemeinsame Halteplatte mit genau einem Verbindungsriegel gesichert sein, welcher jede der die Halteplatte durchsetzenden Verbindungslaschen durchsetzt, oder auch mit mehreren Verbindungsriegeln, welche jeweils jede der die Halteplatte durchsetzenden Verbindungslaschen durchsetzen oder nur einzelne davon. Je nach Einbausituation kann die eine oder die andere Variante bevorzugter sein.The common retaining plate can be secured with exactly one connecting bar, which passes through each of the connecting straps penetrating the retaining plate, or with several connecting bars, which each pass through each of the connecting straps penetrating the holding plate, or only some of them. Depending on the installation situation, one or the other variant may be more preferable.
Liegen die Verbindungslaschen, welche eine gemeinsame Halteplatte durchsetzen, in Durchsetzungsrichtung des Verbindungsriegels gesehen nebeneinander, so ist es beispielsweise vorgesehen, dass diese gemeinsam eine Durchtrittsöffnung für einen Verbindungsriegel bilden. Auf diese Weise kann auch bei derartigen Anordnungen der Verbindungslaschen mit einem einzigen Verbindungsriegel die gewünschte Verbindung hergestellt werden.If the connecting lugs, which pass through a common retaining plate, are next to one another as seen in the direction of the connecting bar, it is provided, for example, that they together form a passage opening for a connecting bar. In this way, the desired connection can also be produced with such arrangements of the connecting straps with a single connecting bar.
Die Verbindungslaschen sind mit Vorteil von den Verbindungsriegeln in Brennkammer-Längsrichtung oder in Brennkammer-Umfangsrichtung durchsetzt. Je nach Einbausituation kann die eine oder die andere Variante bevorzugter sein.The connecting tabs are advantageously penetrated by the connecting bars in the longitudinal direction of the combustion chamber or in the circumferential direction of the combustion chamber. Depending on the installation situation, one or the other variant may be more preferable.
Die Befestigungsriegel und/oder Verbindungsriegel sind bevorzugterweise derartig ausgestaltet, dass sie mit einer Anschlagfläche formschlüssig in Durchsetzungsrichtung an mindestens einer der Befestigungslaschen bzw. Verbindungslaschen anschlagen. Auf diese Weise wird die Montage erleichtert und es kann eine genau definierte Installationsposition sichergestellt werden. Zudem ist ein allfälliges Sichern der Riegel durch diese Ausgestaltung lediglich an einem Ende der Riegel erforderlich.The fastening bars and/or connecting bars are preferably designed in such a way that they strike at least one of the fastening straps or connecting straps with a stop face in a form-fitting manner in the direction of penetration. In this way, assembly is made easier and a precisely defined installation position can be ensured. In addition, any securing of the bolts is only necessary at one end of the bolts as a result of this configuration.
Ein solches Sichern der Befestigungsriegel und/oder Verbindungsriegel erfolgt mit Vorteil mit einem nach der Montage des Riegels ausschliesslich auf dessen Oberfläche durch Schweissen aufgebrachten Materialauftrag, insbesondere mittels eines oder mittels mehrerer Schweisspunkte, welche den Riegel formschlüssig gegen ein Entfernen aus der bestimmungsgemässen Position sichern. Eine derartige Sicherungsmethode weist gegenüber einer Verschweissung mit den Laschen und/oder Halteplatten den Vorteil auf, dass der Materialauftrag zum Entfernen des Riegels mit einer Schleifmaschine einfach und ohne Materialabtrag an anderen Bauteilen weggeschliffen werden kann und der Riegel anschliessend wieder verwendet werden kann.Such a securing of the fastening bolts and/or connecting bolts is advantageously carried out with a material application after the assembly of the bolt exclusively on its surface by welding, in particular by means of one or by means of several welding points, which positively secure the bolt against removal from the intended position. Such a securing method has the advantage over welding with the tabs and/or retaining plates that the material applied to remove the bolt can be simply ground away with a grinding machine and without material removal on other components and the bolt can then be used again.
Die Luftleitbleche weisen bevorzugterweise eine in Brennkammer-Längsrichtung verlaufende Profilierung auf, so dass sie auf ihren Aussenseiten sich in Brennkammer-Längsrichtung erstreckende Strömungskanäle für die Sekundärluft bilden.The air baffle plates preferably have a profile running in the longitudinal direction of the combustion chamber, so that on their outsides they form flow channels for the secondary air that extend in the longitudinal direction of the combustion chamber.
Dabei ist mit Vorteil zumindest ein Teil der in Brennkammer-Längsrichtung gesehen aufeinander folgenden Luftleitbleche derartig ausgebildet, z.B. durch eine abgestufte Profilierung, dass deren einander zugewandten Begrenzungen zum Heissluftaustrittsende hin weisende Austrittsöffnungen für Sekundärluft aus dem jeweiligen sich dahinter erstreckenden Strömungskanal bilden.Advantageously, at least some of the air baffles that follow one another, viewed in the longitudinal direction of the combustion chamber, are designed in such a way, for example by means of a stepped profile, that their facing one another Limitations to the end of the hot air outlet pointing out outlet openings form for secondary air from the respective flow channel extending behind it.
Die in Brennkammer-Längsrichtung gesehen aufeinander folgenden Luftleitbleche, deren einander zugewandten Begrenzungen die zum Heissluftaustrittsende hin weisenden Luftaustrittsöffnungen bilden, sind bevorzugterweise mittels Lasche-Riegel-Anordnungen miteinander verbunden, derart, dass an den sich in Brennkammer-Längsrichtung gegenüberliegenden Begrenzungen der Luftleitbleche in den Randbereichen jeweils Verbindungslaschen gebildet sind, welche in den Brennraum vorstehen. Diese Verbindungslaschen durchsetzen jeweils eine gemeinsame Halteplatte, welche einen Formschluss in Brennkammer-Längsrichtung zwischen den sie durchsetzenden Verbindungslaschen erzeugt und jeweils mittels eines Verbindungsriegels gesichert ist, der die Verbindungslaschen auf der dem Brennraum zugewandten Seite der Halteplatte durchsetzt. Durch diese Art der Verbindung der in Brennraum-Längsrichtung aufeinanderfolgenden Luftleitbleche in den Randbereichen der sich gegenüberliegenden Begrenzungen derselben bleibt der mittlere Bereich der Begrenzungen frei und bietet sehr grossen Gestaltungsfreiraum für die Bildung der Luftaustrittsöffnungen für Sekundärluft.The air baffles that follow one another as seen in the longitudinal direction of the combustion chamber, the boundaries of which face one another form the air outlet openings pointing towards the hot air outlet end, are preferably connected to one another by means of latch-bar arrangements in such a way that at the opposite boundaries of the air baffles in the longitudinal direction of the combustion chamber each connection tabs are formed, which protrude into the combustion chamber. These connecting shackles each pass through a common holding plate, which creates a form fit in the longitudinal direction of the combustion chamber between the connecting shackles passing through it and is each secured by means of a connecting bar which passes through the connecting shackles on the side of the holding plate facing the combustion chamber. This type of connection of the air baffles that follow one another in the longitudinal direction of the combustion chamber in the edge regions of the opposite boundaries of the same means that the central region of the boundaries remains free and offers a great deal of design freedom for the formation of the air outlet openings for secondary air.
Dabei ist es bevorzugt, dass die Verbindungslaschen, welche jeweils die gemeinsame Halteplatte durchsetzen, in Durchsetzungsrichtung des Verbindungsriegels gesehen nebeneinander liegen und gemeinsam eine Durchtrittsöffnung für einen einzigen gemeinsamen Verbindungsriegel bilden, welcher die Verbindungslaschen in Brennkammer-Umfangsrichtung durchsetzt. Eine derartige Realisierung der Verbindung der Luftleitbleche benötigt besonders wenig Platz in Brennkammer-Umfangsrichtung und bietet daher einen maximalen Gestaltungsfreiraum für die Bildung der Luftaustrittsöffnungen.It is preferred that the connecting lugs, which each pass through the common retaining plate, lie next to each other as seen in the direction of penetration of the connecting bar and together form a passage opening for a single common connecting bar which passes through the connecting lugs in the circumferential direction of the combustion chamber. Realizing the connection of the air baffles in this way requires particularly little space in the circumferential direction of the combustion chamber and therefore offers maximum design freedom for the formation of the air outlet openings.
Weiter ist es bevorzugt, dass zumindest ein Teil der in Brennkammer-Längsrichtung gesehen aufeinander folgenden Luftleitbleche derartig profiliert ist, dass deren einander zugewandten Begrenzungen im Wesentlichen stufenlos aneinander angrenzen. Mit Vorteil verfügt zumindest ein Teil dieser Luftleitbleche über zum Brennraum hin weisende Luftaustrittsöffnungen für Sekundärluft aus einem sich dahinter erstreckenden Strömungskanal.Furthermore, it is preferred that at least a part of the combustor longitudinal direction on top of each other following air baffles is profiled in such a way that their mutually facing boundaries adjoin each other essentially steplessly. Advantageously, at least some of these air baffles have air outlet openings pointing toward the combustion chamber for secondary air from a flow channel extending behind them.
Dabei sind diese Luftleitbleche, welche über zum Brennraum hin weisende Luftaustrittsöffnungen verfügen, bevorzugterweise in Brennkammer-Längsrichtung gesehen zwischen dem Heissgasaustrittsende und den zum Heissluftaustrittsende hin weisenden Luftaustrittsöffnungen angeordnet. Es hat sich gezeigt, dass sich auf diese Weise eine besonders gleichmässige Temperatur des aus der Brennkammer austretenden Heissgasstromes erzielen lässt.These air baffles, which have air outlet openings pointing towards the combustion chamber, are preferably arranged between the hot gas outlet end and the air outlet openings pointing towards the hot air outlet end, viewed in the longitudinal direction of the combustion chamber. It has been shown that a particularly uniform temperature of the hot gas stream exiting the combustion chamber can be achieved in this way.
Die in Brennkammer-Längsrichtung gesehen aufeinander folgenden Luftleitbleche, welche derartig profiliert sind, dass deren einander zugewandten Begrenzungen im Wesentlichen stufenlos aneinandergrenzen, sind bevorzugterweise mittels Lasche-Riegel-Anordnungen miteinander verbunden. Dabei ist die Verbindung derart ausgestaltet, dass an den sich in Brennkammer-Längsrichtung gegenüberliegenden Begrenzungen der Luftleitbleche in den zentralen Bereichen jeweils Verbindungslaschen gebildet sind, welche in den Brennraum vorstehen. Diese Verbindungslaschen durchsetzen jeweils eine gemeinsame Halteplatte, die einen Formschluss in Brennkammer-Längsrichtung zwischen den jeweiligen Verbindungslaschen erzeugt. Die Halteplatte ist mittels eines Verbindungsriegels, der die Verbindungslaschen auf der dem Brennraum zugewandten Seite der Halteplatte durchsetzt, gesichert.The air baffles following one another seen in the longitudinal direction of the combustion chamber, which are profiled in such a way that their mutually facing boundaries adjoin one another in an essentially stepless manner, are preferably connected to one another by means of latch-bar arrangements. The connection is designed in such a way that connecting lugs are formed in the central areas on the opposite delimitations of the air baffle plates in the longitudinal direction of the combustion chamber, which protrude into the combustion chamber. These connecting lugs each pass through a common retaining plate, which creates a form fit in the longitudinal direction of the combustion chamber between the respective connecting lugs. The retaining plate is secured by means of a connecting bar, which passes through the connecting lugs on the side of the retaining plate facing the combustion chamber.
Dabei liegen die Verbindungslaschen, welche jeweils die gemeinsame Halteplatte durchsetzen, bevorzugterweise in Durchsetzungsrichtung des Verbindungsriegels gesehen übereinander und werden von einem gemeinsamen Verbindungsriegel in Brennkammer-Längsrichtung durchsetzt. Diese Art der Verbindung der in Brennraum-Längsrichtung aufeinander folgenden Luftleitbleche ist besonders einfach herzustellen und wird bevorzugterweise in der Mitte der sich gegenüberliegenden Begrenzungen derselben realisiert. Hierdurch ergibt sich der Vorteil, dass für die Verbindung zweier in Brennraum-Längsrichtung aufeinanderfolgenden Luftleitbleche eine einzige Laschen-Riegel-Verbindung ausreichend ist.The connecting tabs, which each pass through the common retaining plate, are preferably located one above the other as seen in the direction of penetration of the connecting bar and are passed through by a common connecting bar in the longitudinal direction of the combustion chamber. This type of connection of the air baffles that follow one another in the longitudinal direction of the combustion chamber is special easy to manufacture and is preferably realized in the middle of the opposite borders of the same. This results in the advantage that a single tongue-and-bar connection is sufficient for connecting two air baffles that follow one another in the longitudinal direction of the combustion chamber.
Ein zweiter Aspekt der Erfindung betrifft einen Heissgaserzeuger für eine Asphaltproduktionsanlage, welche eine Brennkammer gemäss dem ersten Aspekt der Erfindung sowie einen Brenner zur Erzeugung eines Heissgasstromes durch die Brennkammer aufweist.A second aspect of the invention relates to a hot gas generator for an asphalt production plant, which has a combustion chamber according to the first aspect of the invention and a burner for generating a hot gas flow through the combustion chamber.
Ein dritter Aspekt der Erfindung betrifft eine Anlage zur Produktion von Asphalt, umfassend einen Heissgaserzeuger gemäss dem zweiten Aspekt der Erfindung und einen Trommeltrockner, bevorzugterweise einen Gegenstrom-Trommeltrockner, welcher mit dem Heissgaserzeuger mit Heissgas beschickt wird oder beschickt werden kann.A third aspect of the invention relates to a plant for the production of asphalt, comprising a hot gas generator according to the second aspect of the invention and a drum dryer, preferably a countercurrent drum dryer, which is or can be charged with hot gas by the hot gas generator.
Ein vierter Aspekt der Erfindung betrifft die Verwendung der Anlage gemäss dem dritten Aspekt der Erfindung zur Trocknung und Erhitzung von granulatförmigem Mineral- und/oder Recyclingasphaltmaterial bei der Asphaltherstellung.A fourth aspect of the invention relates to the use of the plant according to the third aspect of the invention for drying and heating granular mineral and/or recycled asphalt material in asphalt production.
Ein fünfter Aspekt der Erfindung betrifft ein Verfahren zur Befestigung von Luftleitblechen in einem Grundkörper einer Brennkammer für einen Heissgaserzeuger.A fifth aspect of the invention relates to a method for fastening air baffles in a base body of a combustion chamber for a hot gas generator.
Dabei wird von einem trommelartigen Grundkörper einer Brennkammer für einen Heissgaserzeuger ausgegangen, in welchem radial nach innen vorstehende Befestigungslaschen für die Befestigung von Luftleitblechen angeordnet sind.The starting point here is a drum-like base body of a combustion chamber for a hot gas generator, in which fastening tabs protruding radially inward are arranged for fastening air baffles.
In diesem Grundkörper werden Luftzuführungsbleche derart angeordnet, dass sie bei bestimmungsgemäss fertiggestellter Brennkammer die radialen Begrenzungen des Brennraumes der Brennkammer bilden, wobei die Befestigungslaschen zwischen sich gegenüberliegenden Begrenzungen der Luftleitbleche angeordnet sind und/oder durch die Luftleitbleche hindurchtreten, und wobei die Befestigungslaschen mit ihren freien Enden radial über die Luftleitbleche in den Brennraum hervorstehen.Air supply plates are arranged in this base body in such a way that when the combustion chamber is finished as intended, they form the radial boundaries of the combustion chamber of the combustion chamber, with the fastening lugs being arranged between opposing boundaries of the air baffles and/or passing through the air baffles, and with the fastening lugs protrude with their free ends radially over the air baffles into the combustion chamber.
Die in den Brennraum hervorstehenden freien Enden der Befestigungslaschen werden mit Befestigungsriegeln durchsetzt, derart, dass über die Befestigungsriegel ein Formschluss in radialer Richtung zwischen den Befestigungslaschen und den Luftleitblechen entsteht. Hierzu weisen die freien Enden der Befestigungslaschen Durchtrittsöffungen auf, in welche die Befestigungsriegel eingeschoben werden.The free ends of the fastening straps protruding into the combustion chamber are interspersed with fastening bars in such a way that the fastening bars create a form fit in the radial direction between the fastening straps and the air baffle plates. For this purpose, the free ends of the fastening tabs have passage openings into which the fastening bars are pushed.
Durch die Erfindung wird es möglich, mit geringem Zeit-, Material- und Arbeitsaufwand einzelne Luftleitbleche vom Brennkammer-Innenraum her ohne Zerstörung von Bauteilen zu entfernen und anschliessend wieder zu installieren, sei es um diese zu ersetzen oder um eine Kontrolle und/oder Reinigung des Sekundärluftbereichs durchzuführen.The invention makes it possible to remove individual air baffles from the interior of the combustion chamber without destroying components and then reinstall them with little expenditure of time, material and work, whether to replace them or to check and/or clean the Carry out secondary air area.
Mit Vorteil werden dabei die Luftleitbleche derartig in dem Grundkörper angeordnet, dass die Befestigungslaschen zwischen in Brennkammer-Längsrichtung verlaufenden sich gegenüberliegenden Begrenzungen der Luftleitbleche in den Brennraum hineinstehen, wobei die jeweiligen Befestigungsriegel und/oder allfällige vorhandene Halteplatten diese Begrenzungen zur Bildung des radialen Formschlusses übergreifen. Auf diese Weise lässt sich eine freie axiale Verschiebbarkeit der Luftleitbleche auf einfache und sichere Weise gewährleisten.Advantageously, the air baffles are arranged in the base body in such a way that the fastening tabs protrude into the combustion chamber between opposing boundaries of the air baffles running in the longitudinal direction of the combustion chamber, with the respective fastening bars and/or any existing retaining plates overlapping these boundaries to form the radial form fit. In this way, free axial displaceability of the air baffle plates can be ensured in a simple and reliable manner.
Dabei ist es bevorzugt, dass die zwischen in Brennkammer-Längsrichtung verlaufenden Begrenzungen der Luftleitbleche angeordneten Befestigungslaschen in Brennkammer-Umfangsrichtung mit den Befestigungsriegeln durchsetzt werden. Auf diese Weise können die Laschen in Brennkammer-Umfangsrichtung sehr flach ausgebildet werden und der Abstand zwischen den Begrenzungen der Luftleitbleche entsprechend sehr klein gewählt werden.It is preferred that the fastening tabs arranged between the boundaries of the air baffle plates running in the longitudinal direction of the combustion chamber are interspersed with the fastening bars in the circumferential direction of the combustion chamber. In this way, the tabs can be made very flat in the circumferential direction of the combustion chamber and the distance between the boundaries of the air baffle plates can be chosen to be correspondingly very small.
Bevorzugterweise werden zwischen den Befestigungsriegeln und den Innenseiten der Luftleitbleche jeweils Halteplatten angeordnet, welche von den Befestigungslaschen durchsetzt sind. Durch die Verwendung von Halteplatten ergibt sich der Vorteil, dass die den radialen Formschluss mit der Innenseite des jeweiligen Luftleitbleches erzeugende Fläche unabhängig vom Befestigungsriegel ausgestaltet werden kann und dadurch auf Verschleissschutz optimiert werden kann.Preferably, between the mounting bars and the insides of the air baffles respectively Arranged retaining plates, which are penetrated by the fastening tabs. The use of retaining plates results in the advantage that the surface generating the radial form fit with the inside of the respective air baffle can be designed independently of the fastening bar and can thus be optimized for protection against wear.
In einer ersten bevorzugten Variante werden die Halteplatten derartig angeordnet, dass sie bevorzugterweise spielfrei auf den Innenseiten der jeweiligen Luftleitbleche aufliegen, während sie auf ihrer anderen Seite an den jeweiligen Befestigungsriegel angrenzen. Hierdurch lässt sich eine im Wesentlichen vibrationsfreie Befestigung der Luftleitbleche erreichen.In a first preferred variant, the retaining plates are arranged in such a way that they preferably rest without play on the insides of the respective air baffle plates, while on their other side they adjoin the respective fastening bars. In this way, a substantially vibration-free attachment of the air baffles can be achieved.
In einer zweiten bevorzugten Variante sind auf der Innenseite des Grundkörpers Anschlagflächen vorhanden, an welche die Luftleitbleche in radialer Richtung nach aussen zeigend anschlagen oder anschlagen können. Die Halteplatten werden mit einem derartigen radialen Abstand zu diesen Anschlagflächen angeordnet, dass sich die Luftleitbleche zwischen diesen Anschlagflächen und den Halteplatten radial um ein bestimmtes Spielmass bewegen können. Dieses Spielmass beträgt bevorzugterweise mindestens 3 mm, insbesondere mindestens 5 mm. Mit diesem Spielmass kann erreicht werden, dass bei der Herstellung der Brennkammer eine einfache Montage der Luftleitbleche durch axiales Einschieben vom Heissgasaustrittsende der Brennkammer her möglich ist. Auch lassen sich hierdurch Spannungen bei Fertigungsungenauigkeiten und Wärmeausdehnungen verhindern oder zumindest deutlich reduzieren.In a second preferred variant, stop surfaces are present on the inside of the base body, against which the air baffle plates, pointing outwards in the radial direction, strike or can strike. The holding plates are arranged at such a radial distance from these abutment surfaces that the air baffles can move radially by a certain amount of play between these abutment surfaces and the holding plates. This amount of play is preferably at least 3 mm, in particular at least 5 mm. With this amount of play it can be achieved that during manufacture of the combustion chamber the air baffle plates can be easily installed by axially pushing them in from the hot gas outlet end of the combustion chamber. This also makes it possible to prevent or at least significantly reduce stresses in the event of manufacturing inaccuracies and thermal expansion.
Ein sechster Aspekt der Erfindung betrifft ein Verfahren zum Verbinden von in Brennkammer-Längsrichtung aufeinander folgenden Luftleitblechen in einem Grundkörper einer Brennkammer für einen Heissgaserzeuger.A sixth aspect of the invention relates to a method for connecting air baffles that follow one another in the longitudinal direction of the combustion chamber in a base body of a combustion chamber for a hot gas generator.
Dabei werden Luftleitbleche bereitgestellt, welche Verbindungslaschen aufweisen, die endseitig von der zur Bildung einer Brennraumbegrenzung der Brennkammer vorgesehenen Fläche des jeweiligen Luftleitbleches abstehen.In this case, air baffle plates are provided, which have connecting lugs that extend from the end to form a combustion chamber delimitation of the combustion chamber protrude from the intended surface of the respective air baffle.
Diese Luftleitbleche werden derartig in einem Grundkörper einer Brennkammer für einen Heissgaserzeuger angeordnet, dass die Luftleitbleche bei bestimmungsgemäss fertiggestellter Brennkammer die radialen Begrenzungen des Brennraumes der Brennkammer bilden. Dabei liegen sich die endseitigen Verbindungslaschen von in Brennkammer-Längsrichtung aufeinander folgenden Luftleitblechen jeweils gegenüber und/oder grenzen aneinander an.These air baffles are arranged in a base body of a combustion chamber for a hot gas generator in such a way that the air baffles form the radial boundaries of the combustion space of the combustion chamber when the combustion chamber is finished as intended. In this case, the end-side connecting tabs of air baffles following one another in the longitudinal direction of the combustion chamber are opposite and/or adjoin one another.
Auf den jeweiligen sich gegenüberliegenden und/oder aneinander angrenzenden Verbindungslaschen wird jeweils eine Halteplatte mit einer Durchtrittsöffnung angeordnet, derart, dass die Verbindungslaschen die Durchtrittsöffnung der Halteplatte durchsetzen und mit ihren freien Enden über die dem Brennraum zugewandte Seite der Halteplatte in den Brennraum hervorstehen. Dabei erzeugen die Halteplatten jeweils einen Formschluss in Brennkammer-Längsrichtung zwischen den Verbindungslaschen.A retaining plate with a through-opening is arranged on the respective opposite and/or adjoining connecting lugs in such a way that the connecting lugs pass through the through-opening of the retaining plate and protrude with their free ends beyond the side of the retaining plate facing the combustion chamber into the combustion chamber. The retaining plates each produce a form fit in the longitudinal direction of the combustion chamber between the connecting straps.
Die Halteplatten werden jeweils mittels eines Verbindungsriegels, welcher mindestens eine der Verbindungslaschen auf der dem Brennraum zugewandten Seite der Halteplatte durchsetzt, gesichert.The holding plates are each secured by means of a connecting bar which passes through at least one of the connecting lugs on the side of the holding plate facing the combustion chamber.
Durch die Erfindung wird es möglich, mit geringem Zeit-, Material- und Arbeitsaufwand einzelne Luftleitbleche vom Brennkammer-Innenraum her ohne Zerstörung von Bauteilen zu entfernen und anschliessend wieder zu installieren, sei es um diese zu ersetzen oder um eine Kontrolle und/oder Reinigung des Sekundärluftbereichs durchzuführen.The invention makes it possible to remove individual air baffles from the interior of the combustion chamber without destroying components and then reinstall them with little expenditure of time, material and work, whether to replace them or to check and/or clean the Carry out secondary air area.
Bei den Verfahren gemäss dem fünften und dem sechsten Aspekt der Erfindung werden die Befestigungs-und/oder Verbindungsriegel bevorzugterweise mit einem nach der Montage des Riegels ausschliesslich auf dessen Oberfläche durch Schweissen aufgebrachten Materialauftrags, insbesondere mittels eines oder mehrerer Schweisspunkte, formschlüssig gegen ein Entfernen aus der bestimmungsgemässen Position gesichert. Eine derartige Sicherungsmethode weist gegenüber einer Verschweissung mit den Laschen und/oder Halteplatten den Vorteil auf, dass der Materialauftrag zum Entfernen des Riegels mit einer Schleifmaschine einfach und ohne Zerstörung oder Beeinträchtigung anderer Bauteilen weggeschliffen werden kann und der Riegel anschliessend zudem wieder verwendet werden kann.In the method according to the fifth and sixth aspect of the invention, the fastening and/or connecting bars are preferably positively secured against removal from the as intended position secured. Such a securing method has the advantage over welding with the tabs and/or retaining plates that the material applied to remove the bolt can be simply ground away with a grinding machine and without destroying or impairing other components and the bolt can then also be used again.
Weitere Ausgestaltungen, Vorteile und Anwendungen der Erfindung ergeben sich aus den abhängigen Ansprüchen und aus der nun folgenden Beschreibung anhand der Figuren. Dabei zeigen:
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Fig. 1 eine perspektivische Ansicht eines Längsschnittes durch einen erfindungsgemässen Aufbau eines Heissgaserzeugers und eines Trommeltrockners einer Asphaltproduktionsanlage; -
Fig. 2 eine perspektivische Ansicht eines Längsschnittes durch die erfindungsgemässe Brennkammer des Heissgaserzeugers der Asphaltproduktionsanlage ausFig. 1 ; -
Fig. 3 das Detail X ausFig. 2 ; -
Fig. 4 das Detail Y ausFig. 2 ; -
Fig. 5 eine vergrösserte Ansicht eines Teils der Darstellung ausFig. 3 ; -
Fig. 6 eine vergrösserte Ansicht eines Teils der Darstellung ausFig. 4 ; -
Fig. 7 einen Schnitt entlang der Linie C-C inFig. 6 ; -
Fig. 8 einen Schnitt entlang der Linie A-A inFig. 5 ; -
Fig. 9 einen Schnitt entlang der Linie B-B inFig. 6 ; -
Fig. 10a eine perspektivische Ansicht der in denFiguren 3-6 mit der Bezugsziffer 9a bezeichneten Lasche-Riegel-Anordnung; -
Fig. 10b eine perspektivische Explosionsdarstellung der Lasche-Riegel-Anordnung ausFig. 10a ; -
Fig. 11a eine perspektivische Ansicht der inden Figuren 3 und5 mit der Bezugsziffer 9b bezeichneten Lasche-Riegel-Anordnung; -
Fig. 11b eine perspektivische Explosionsdarstellung der Lasche-Riegel-Anordnung ausFig. 11a ; -
Fig. 12a eine perspektivische Ansicht der inden Figuren 4 und6 mit der Bezugsziffer 9c bezeichneten Lasche-Riegel-Anordnung; -
Fig. 12b eine perspektivische Explosionsdarstellung der Lasche-Riegel-Anordnung ausFig. 12a ;
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1 a perspective view of a longitudinal section through an inventive structure of a hot gas generator and a drum dryer of an asphalt production plant; -
2 a perspective view of a longitudinal section through the inventive combustion chamber of the hot gas generator of theasphalt production plant 1 ; -
3 the detail X off2 ; -
4 the detail Y off2 ; -
figure 5 an enlarged view of part of theillustration 3 ; -
6 an enlarged view of part of theillustration 4 ; -
7 a cut along the line CC in6 ; -
8 a cut along the line AA infigure 5 ; -
9 a cut along line BB in6 ; -
Figure 10a a perspective view of in theFigures 3-6 tab and bar assembly indicated byreference numeral 9a; -
Figure 10b Figure 12 shows an exploded perspective view of the tab and latch assemblyFigure 10a ; -
Figure 11a a perspective view of in theFigures 3 and5 tab and bar assembly indicated byreference numeral 9b; -
Figure 11b Figure 12 shows an exploded perspective view of the tab and latch assemblyFigure 11a ; -
12a a perspective view of in thefigures 4 and6 tab and bar assembly indicated by reference numeral 9c; -
Figure 12b Figure 12 shows an exploded perspective view of the tab and latch assembly12a ;
Wie zu erkennen ist, umfasst die Anlage 1 einen erfindungsgemässen Heissgaserzeuger 2 und einen Gegenstrom-Trommeltrockner 3 zur Trocknung und Erhitzung von granulatförmigem Mineral- und/oder Recyclingasphaltmaterial für die Asphaltherstellung, dessen innerer Aufbau nicht genauer dargestellt ist.As can be seen, the
Wie aus
Die Luftleitbleche 7 weisen eine in Brennkammer-Längsrichtung S verlaufende Profilierung auf, wodurch sie auf ihren Aussenseiten sich in Brennkammer-Längsrichtung S erstreckende Strömungskanäle für Sekundärluft bilden.The air baffles 7 have a profile running in the longitudinal direction S of the combustion chamber, as a result of which they form flow channels for secondary air that extend in the longitudinal direction S of the combustion chamber on their outer sides.
Wie in Zusammenschau mit den
Wie in weiterer Zusammenschau mit den
Dabei sind zwischen den Befestigungsriegeln 11 und den Innenseiten der Luftleitbleche 7 jeweils Halteplatten 12 angeordnet, welche von den Befestigungslaschen 10 durchsetzt werden.In this case, retaining
Wie insbesondere in
Wie weiter zu erkennen ist, stehen die Befestigungslaschen 10 zwischen in Brennkammer-Längsrichtung S verlaufenden sich gegenüberliegenden Begrenzungen 13 der Luftleitbleche 7 in den Brennraum 8 vor, und die Befestigungsriegel 11 und Halteplatten 12 übergreifen diese Begrenzungen 13. Die Befestigungsriegel 11 durchsetzen dabei die Befestigungslaschen 10 in Brennkammer-Umfangsrichtung.As can also be seen, the fastening lugs 10 protrude into the combustion chamber 8 between
Wie aus einer Zusammenschau der
Wie weiter zu erkennen ist, sind jeweils die eine Luftaustrittsöffnungen 15 zusammen bildenden Luftleitbleche 7 mittels zweier Lasche-Riegel-Anordnungen 9b miteinander verbunden, so dass sie sich bei einer Wärmeausdehnung bzw. -schrumpfung axial nur gemeinsam in Brennkammer-Längsrichtung S verschieben können.As can also be seen, the
Wie in Zusammenschau mit
Wie aus einer Zusammenschau der
Wie weiter zu erkennen ist, sind die in Brennkammer-Längsrichtung S gesehen aufeinander folgenden Luftleitbleche 7, welche stromabwärts vom Brennerende A gesehen die vierte bis sechste Umfangsreihe von Luftleitblechen 7 bilden, jeweils mittels genau einer Lasche-Riegel-Anordnung 9c miteinander verbunden, so dass sie sich bei einer Wärmedehnung bzw. -schrumpfung axial nur gemeinsam in Brennkammer-Längsrichtung S verschieben können.As can also be seen, the air baffles 7 that follow one another as seen in the longitudinal direction S of the combustion chamber, which form the fourth to sixth circumferential row of air baffles 7 seen downstream from the burner end A, are each connected to one another by means of exactly one latch-bar arrangement 9c, so that they only move axially during thermal expansion or contraction can move together in the longitudinal direction S of the combustion chamber.
Wie in Zusammenschau mit
Wie zu erkennen ist, liegen die Verbindungslaschen 21a, 21b in Durchsetzungsrichtung des Verbindungsriegels 18 gesehen übereinander und sind von dem Verbindungsriegel 18 in Brennkammer-Längsrichtung S durchsetzt.As can be seen, the connecting
Alle Befestigungs- und Verbindungsriegel 11, 18 sind abgestuft ausgebildet, so dass sie mit von der Abstufung gebildeten Anschlagflächen 23 formschlüssig in Durchsetzungsrichtung jeweils an der Befestigungslasche 10, an der Verbindungslasche 21a bzw. an den beiden Verbindungslaschen 16a, 16b anschlagen.All fastening and connecting
Zudem sind alle Befestigungs- und Verbindungsriegel 11, 18 mit einem auf ihrer brennraumseitigen Oberfläche angebrachten Schweisspunkt 20 formschlüssig gegen ein Entfernen gesichert.In addition, all fastening and connecting
Während in der vorliegenden Anmeldung bevorzugte Ausführungen der Erfindung beschrieben sind, ist klar darauf hinzuweisen, dass die Erfindung nicht auf diese beschränkt ist und auch in anderer Weise innerhalb des Umfangs der nun folgenden Ansprüche ausgeführt werden kann.While preferred embodiments of the invention are described in the present application, it is to be clearly understood that the invention is not limited to these and otherwise within within the scope of the claims that follow.
Claims (36)
- Combustion chamber (4) for a hot gas generator (2) of an asphalt production plant (1), comprising a drum-like base body (6) with a burner end (A) and a hot gas outlet end (B), which is lined with a plurality of successive air baffles (7) on its inside, viewed in the circumferential direction of the combustion chamber, the outsides of which face the inside of the base body (6) and the insides of which form the boundaries of the combustion space (8) of the combustion chamber (4),
characterised in that
at least a portion of the air baffles (7) is held in the base body (6) by means of tab-bar arrangements (9a) in such a way that fastening tabs (10) extending radially over the inner sides of the air baffles (7) into the combustion space (8) are passed through by fastening bars (11), which show a form fit in the radial direction to the centre of the combustion chamber between the fastening tabs (10) and the air baffles (7). - Combustion chamber (4) according to claim 1, wherein retaining plates (12), through which the fastening tabs (10) pass, are arranged between the fastening bars (11) and the insides of the air baffles (7) .
- Combustion chamber (4) according to claim 2, wherein the retaining plates (12) rest on the insides of the air baffles (7).
- Combustion chamber (4) according to one of claims 2 to 3, wherein on the inside of the base body (6) there are stop surfaces (22) against which the air baffles (7) pointing outwards in the radial direction strike or can strike, and wherein the retaining plates (12) have such a distance (a) to these stop surfaces (22) that the air baffles (7) can move radially between these stop surfaces (22) and the retaining plates (12) by a certain amount of clearance (d), and in particular, wherein the clearance (d) is at least 3 mm, in particular at least 5 mm.
- Combustion chamber (4) according to one of the preceding claims, wherein at least a portion of the fastening tabs (10) extend into the combustion space (8) between opposite boundaries (13) of the air baffles (7) running in the longitudinal direction (S) of the combustion chamber, and the respective fastening bars (11) and/or retaining plates (12) overlap these boundaries (13).
- Combustion chamber (4) according to claim 5, wherein the fastening tabs (10) arranged between the boundaries (13) of the air baffles (7) running in the longitudinal direction (S) of the combustion chamber are passed through by the fastening bars (11) in the circumferential direction of the combustion chamber.
- Combustion chamber (4) according to one of the preceding claims, wherein the base body (6) of the combustion chamber (4) is lined on its inside with a plurality of successive air baffles (7) both in the circumferential direction of the combustion chamber and in the longitudinal direction (S) of the combustion chamber.
- Combustion chamber (4) according to claim 7, wherein at least a portion of the air baffles (7) that follow one another in the longitudinal direction (S) of the combustion chamber are connected to one another by means of tab-bar arrangements (9b, 9c) in such a way that connecting tabs (16a, 16b; 21a, 21b) are formed at the opposite boundaries of the air baffles (7) that follow one another in the longitudinal direction (S) of the combustion chamber, which extend into the combustion space (8) and pass through a common retaining plate (17), which forms a form fit in the longitudinal direction (S) of the combustion chamber between the connecting tabs (16a, 16b; 21a, 21b) and is secured by means of a connecting bar (18) which passes through at least one of the connecting tabs (16a, 16b; 21a, 21b) on the side of the retaining plate (17) facing the combustion space (8).
- Combustion chamber (4) according to claim 8, wherein at least a portion of the connecting tabs (21a, 21b) which pass through a common retaining plate (17) lie one above the other as viewed in the direction in which the connecting bar (18) is pushed through.
- Combustion chamber (4) according to one of claims 8 to 9, wherein at least a portion of the connecting tabs (16a, 16b) which pass through a common retaining plate (17) lie next to one another as viewed in the direction in which the connecting bar (18) is pushed through.
- Combustion chamber (4) according to one of claims 8 to 10, wherein the common retaining plate (17) is secured with exactly one connecting bar (18) which passes through each of the connecting tabs (16a, 16b; 21a, 21b) penetrating the retaining plate (17).
- Combustion chamber (4) according to claim 10 and according to claim 11, wherein the connecting tabs (16a, 16b), which pass through a common retaining plate (17) and are located next to one another, as viewed in the direction in which the connecting bar (18) is pushed through, together form a passage opening for the connecting bar (18).
- Combustion chamber (4) according to one of claims 8 to 12, wherein the connecting bars (18) pass through at least a portion of the connecting tabs (21a, 21b) in the longitudinal direction (S) of the combustion chamber.
- Combustion chamber (4) according to one of claims 8 to 13, wherein the connecting bars (18) pass through at least a portion of the connecting tabs (16a, 16b) in the circumferential direction of the combustion chamber.
- Combustion chamber (4) according to one of the preceding claims, wherein at least a portion of the fastening bars (11) and/or connecting bars (18) strikes with a stop surface in a form-fitting manner in the direction of penetration against at least one of the fastening tabs (10) or connecting tabs (16a, 16b; 21a).
- Combustion chamber (4) according to one of the preceding claims, wherein at least a portion of the fastening bars (11) and/or connecting bars (18) provided with a material application applied exclusively to its surface by welding after the mounting of the bar (11; 18), in particular by means of one or several welding points (20), is secured in a form-fitting manner against removal from the intended position.
- Combustion chamber according to one of the preceding claims, wherein at least a portion of the fastening bars and/or connecting bars is secured in the intended position with a material bond by a welding produced after the mounting of the bar between the bar and a fastening or connecting tab and/or a retaining plate.
- Combustion chamber (4) according to one of the preceding claims, wherein at least a portion of the air baffles (7) has a profile running in the longitudinal direction (S) of the combustion chamber, such that they form flow channels extending in the longitudinal direction (S) of the combustion chamber on their outer sides.
- Combustion chamber (4) according to claim 7 and according to claim 18, wherein at least a portion of the air baffles (7) following one another, as viewed in the longitudinal direction (S) of the combustion chamber, is profiled in such a way that their mutually facing boundaries (14) pointing towards the hot air outlet end (B) form air outlet openings (15) from a flow channel extending behind them.
- Combustion chamber (4) according to claim 19, wherein the air baffles (7) following one another, as viewed in the longitudinal direction (S) of the combustion chamber, whose mutually facing boundaries (14) form the air outlet openings (15) pointing towards the hot air outlet end (B), are connected to one another by means of tab-bar arrangements (9b) in such a way that connecting tabs (16a, 16b) are formed in the edge regions on the opposite boundaries (14) of the air baffles (7) in the longitudinal direction (S) of the combustion chamber, and these extend into the combustion space (8) and in each case pass through a common retaining plate (17), which creates a form fit in the longitudinal direction (S) of the combustion chamber between the respective connecting tabs (16a, 16b) and is secured in each case by means of a connecting bar (18) which passes through the respective connecting tabs (16a, 16b) on the side of the retaining plate (17) facing the combustion space (8).
- Combustion chamber (4) according to claim 20, wherein the connecting tabs (16a, 16b), which each pass through the common retaining plate (17), as viewed in the direction of penetration of the connecting bar (18), lie next to each other and together form a passage opening for a common connecting bar (18), which passes through the connecting tabs (16a, 16b) in the circumferential direction of the combustion chamber.
- Combustion chamber (4) according to claim 7 and according to claim 18, wherein at least a portion of the air baffles (7) following one another, as viewed in the longitudinal direction (S) of the combustion chamber, is profiled in such a way that their mutually facing boundaries (14) adjoin one another in an essentially continuous manner, and in particular that at least a portion of these air baffles (7) has air outlet openings (19) pointing towards the combustion space (8) from a flow channel extending behind them.
- Combustion chamber (4) according to one of claims 19 to 21 and according to claim 22, wherein the air baffles (7), which have air outlet openings (19) pointing towards the combustion space (8) from a flow channel extending behind them, lie, as viewed in the longitudinal direction (S) of the combustion chamber, between the hot gas outlet end (B) and the air outlet openings (15) pointing towards the hot air outlet end (B) .
- Combustion chamber (4) according to one of claims 22 to 23, wherein the air baffles (7) following one another, as viewed in the longitudinal direction (S) of the combustion chamber, which are profiled in such a way that their mutually facing boundaries (14) adjoin one another in an essentially continuous manner, are connected to one another by means of tab-bar arrangements (9c) in such a way that connecting tabs (21a, 21b) are formed in the central regions on the opposite boundaries (14) of the air baffles (7) in the longitudinal direction of the combustion chamber, tabs which extend into the combustion space (8) and in each case pass through a common retaining plate (17), which creates a form fit in the longitudinal direction (S) of the combustion chamber between the respective connecting tabs (21a, 21b) and each is secured by means of a connecting bar (18), which passes through the respective connecting tabs (21a, 21b) on the side of the retaining plate (17) facing the combustion space (8).
- Combustion chamber (4) according to claim 24, wherein the connecting tabs (21a, 21b), which each pass through the common retaining plate (17), lie one above the other as viewed in the direction of penetration of the connecting bar (18) and are passed through by a common connecting bar (18) in the longitudinal direction (S) of the combustion chamber.
- Hot gas generator (2) for an asphalt production plant (1), comprising a combustion chamber (4) according to one of the preceding claims and a burner (5) for generating a hot gas flow through the combustion chamber (4).
- Plant (1) for the production of asphalt, comprising a hot gas generator (2) according to claim 26 and a drum dryer (3), in particular a countercurrent drum dryer (3), which is or can be charged with hot gas with the hot gas generator (2).
- Use of the plant (1) according to claim 27 for drying and heating granular mineral and/or recycling asphalt material for asphalt production.
- Method for fastening air baffles (7) in a base body (6) of a combustion chamber (4) for a hot gas generator (2), comprising the steps:a) providing a drum-like base body (6) of a combustion chamber (4) for a hot gas generator (2) with fastening tabs (10) extending radially inwards therein for fastening air baffles (7);b) arranging air baffles (7) in the base body (6) in such a way that they form the radial boundaries of the combustion space (8) of the combustion chamber (4) as intended, wherein the fastening tabs (10) between opposite boundaries (13) of the air baffles (7) are arranged and/or pass through the air baffles (7) and wherein the fastening tabs (10) extend radially beyond the air baffles (7) into the combustion space (8);c) pushing through the ends of the fastening tabs (10) extending into the combustion space (8) with fastening bars (11) in such a way that a form fit is created in the radial direction between the fastening tabs (10) and the air baffles (7).
- Method according to claim 29, wherein the air baffles (7) are arranged in the base body (6) in such a way that at least a portion of the fastening tabs (10) are arranged between boundaries (13) of the air baffles (7) running in the longitudinal direction (S) of the combustion chamber.
- Method according to claim 30, wherein the ends of the fastening tabs (10) which extend into the combustion space (8) and are arranged between boundaries (13) of the air baffles (7) running in the longitudinal direction (S) of the combustion chamber, are passed through with fastening bars (11) in the circumferential direction of the combustion chamber.
- Method according to one of claims 29 to 31, wherein retaining plates (12) are arranged between the fastening bars (11) and the sides of the air baffles (7) facing the combustion space (8), through which the respective fastening tabs (10) pass.
- Method according to claim 32, wherein the retaining plates (12) are arranged in such a way that they rest on the insides of the air baffles (7).
- Method according to one of claims 32 to 33, wherein on the inside of the base body (6) there are stop surfaces (22) against which the air baffles (7) strike or can strike, pointing outwards in the radial direction, and wherein the retaining plates (12) are arranged at such a distance (a) from these stop surfaces (22) that the air baffles (7) can move radially between these stop surfaces (22) and the retaining plates (12) by a certain amount of clearance (d), and in particular, wherein the clearance (d) is at least 3 mm, in particular at least 5 mm.
- Method for connecting air baffles (7) following one another in the longitudinal direction (S) of the combustion chamber in a base body (6) of a combustion chamber (4) for a hot gas generator (2), comprising the steps:a) providing air baffles (7) with connecting tabs (16a, 16b; 21a, 21b) which protrude at the ends from the surface of the respective air baffle (7) intended to form a combustion chamber boundary;b) arranging the air baffles (7) in a base body (6) of a combustion chamber (4) for a hot gas generator (2) in such a way that the air baffles (7) form a radial boundary of the combustion space (8) of the combustion chamber (4) as intended, wherein the end connecting tabs (16a, 16b; 21a, 21b) of air baffles (7) following one another in the longitudinal direction (S) of the combustion chamber are opposite and/or adjoin one another;c) arranging one retaining plate (17) with a passage opening on the respective opposite and/or adjoining connecting tabs (16a, 16b; 21a, 21b) in such a way that the connecting tabs (16a, 16b; 21a, 21b) push through the passage opening of the retaining plate (17) and extend beyond the retaining plate (17) into the combustion space (8), wherein the retaining plate (17) creates a form fit in the longitudinal direction (S) of the combustion chamber between the connecting tabs (16a, 16b; 21a, 21b); andd) securing the respective retaining plate (17) by means of a connecting bar (18) which passes through at least one of the connecting tabs (16a, 16b; 21a, 21b) on the side of the retaining plate (17) facing the combustion space (8).
- Method according to one of claims 27 to 35, wherein at least a portion of the fastening bars (10) and/or connecting bars (16a, 16b; 21a, 21b) provided with a material application (20) applied exclusively to the surface of the bar by welding after the mounting of the bar, in particular with one or more welding points (20), is secured in a form-fitting manner against removal from the intended position.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL19716359.5T PL3931488T3 (en) | 2019-04-04 | 2019-04-04 | Combustion chamber for a hot gas generator of an asphalt production plant with air baffles and method for securing the air baffles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2019/058470 WO2020200450A1 (en) | 2019-04-04 | 2019-04-04 | Combustion chamber for a hot gas generator of an asphalt production plant with air baffles and method for securing the air baffles |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3931488A1 EP3931488A1 (en) | 2022-01-05 |
EP3931488B1 true EP3931488B1 (en) | 2023-05-17 |
Family
ID=66102076
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19716359.5A Active EP3931488B1 (en) | 2019-04-04 | 2019-04-04 | Combustion chamber for a hot gas generator of an asphalt production plant with air baffles and method for securing the air baffles |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP3931488B1 (en) |
CN (1) | CN113825950B (en) |
AU (1) | AU2019440120B2 (en) |
DK (1) | DK3931488T3 (en) |
ES (1) | ES2952249T3 (en) |
FI (1) | FI3931488T3 (en) |
PL (1) | PL3931488T3 (en) |
WO (1) | WO2020200450A1 (en) |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4130364A (en) * | 1977-04-28 | 1978-12-19 | Brown Ralph E | Method and portable apparatus for treating asphalt paving material |
FR2646880A1 (en) * | 1989-05-11 | 1990-11-16 | Snecma | THERMAL PROTECTION SHIRT FOR POST-COMBUSTION CHANNEL OR TRANSITION OF TURBOREACTOR |
US5363643A (en) * | 1993-02-08 | 1994-11-15 | General Electric Company | Segmented combustor |
EP1533574A1 (en) * | 2003-11-24 | 2005-05-25 | Siemens Aktiengesellschaft | Gas turbine combustion chamber with lining elements and method to apply or remove these elements |
DE202006014390U1 (en) * | 2006-09-15 | 2006-11-30 | Leister Process Technologies | Hot air welding nozzle for hot air welding device has at least one forward outlet aperture pointing in direction of motion of welding device |
DE202008012970U1 (en) * | 2008-09-30 | 2009-02-12 | Ammann Schweiz Ag | Combustion chamber for a hot gas generator |
DE202008012971U1 (en) * | 2008-09-30 | 2008-12-24 | Ammann Schweiz Ag | Plant for drying and heating granulated material for asphalt production |
KR101128685B1 (en) * | 2011-10-06 | 2012-03-27 | 김병구 | Recycle drier in apparatus of regenerating waste ascon |
FR2986016B1 (en) * | 2012-01-25 | 2014-03-21 | Argumat | DEVICE AND METHOD FOR MANUFACTURING COATED PRODUCTS, FOR EXAMPLE OF BITUMINOUS COATED PRODUCTS, WITH PROTECTIVE PLATES |
JP6261036B2 (en) * | 2013-01-25 | 2018-01-17 | 有限会社 トラスト21 | Combustion device |
JP6315551B2 (en) * | 2014-01-17 | 2018-04-25 | 日工株式会社 | Asphalt mixture production equipment |
CN105951559B (en) * | 2016-05-12 | 2018-04-13 | 吉林省嘉鹏集团有限公司 | A kind of in-situ heat regeneration machine exhaust gas centralized processor |
DE102017217106A1 (en) * | 2016-11-23 | 2018-05-24 | Benninghoven GmbH & Co. KG Mülheim | Hot gas generator for heating gas and plant for the production of asphalt with such a hot gas generator |
CN208293356U (en) * | 2018-06-05 | 2018-12-28 | 福建泉成机械有限公司 | A kind of reclaimed asphalt mixture drying drum |
-
2019
- 2019-04-04 DK DK19716359.5T patent/DK3931488T3/en active
- 2019-04-04 EP EP19716359.5A patent/EP3931488B1/en active Active
- 2019-04-04 CN CN201980096210.6A patent/CN113825950B/en active Active
- 2019-04-04 WO PCT/EP2019/058470 patent/WO2020200450A1/en unknown
- 2019-04-04 ES ES19716359T patent/ES2952249T3/en active Active
- 2019-04-04 FI FIEP19716359.5T patent/FI3931488T3/en active
- 2019-04-04 AU AU2019440120A patent/AU2019440120B2/en active Active
- 2019-04-04 PL PL19716359.5T patent/PL3931488T3/en unknown
Also Published As
Publication number | Publication date |
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FI3931488T3 (en) | 2023-08-08 |
WO2020200450A1 (en) | 2020-10-08 |
AU2019440120A1 (en) | 2021-10-28 |
PL3931488T3 (en) | 2023-09-18 |
CN113825950A (en) | 2021-12-21 |
ES2952249T3 (en) | 2023-10-30 |
DK3931488T3 (en) | 2023-08-07 |
CN113825950B (en) | 2024-05-17 |
AU2019440120B2 (en) | 2023-08-31 |
EP3931488A1 (en) | 2022-01-05 |
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