EP2467644A1 - POÊLE À GRANULÉS DE BOIS POUR DES PUISSANCES ALLANT JUSQU'À MOINS DE 1 kW - Google Patents

POÊLE À GRANULÉS DE BOIS POUR DES PUISSANCES ALLANT JUSQU'À MOINS DE 1 kW

Info

Publication number
EP2467644A1
EP2467644A1 EP10757703A EP10757703A EP2467644A1 EP 2467644 A1 EP2467644 A1 EP 2467644A1 EP 10757703 A EP10757703 A EP 10757703A EP 10757703 A EP10757703 A EP 10757703A EP 2467644 A1 EP2467644 A1 EP 2467644A1
Authority
EP
European Patent Office
Prior art keywords
furnace
pellet
wood
grate
belonging
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP10757703A
Other languages
German (de)
English (en)
Other versions
EP2467644B1 (fr
Inventor
André Riemens
Gabriela Vetsch
Basso Salerno
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STUV SA
Original Assignee
STUV SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by STUV SA filed Critical STUV SA
Publication of EP2467644A1 publication Critical patent/EP2467644A1/fr
Application granted granted Critical
Publication of EP2467644B1 publication Critical patent/EP2467644B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
    • F23K3/10—Under-feed arrangements
    • F23K3/14—Under-feed arrangements feeding by screw
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B40/00—Combustion apparatus with driven means for feeding fuel into the combustion chamber
    • F23B40/04—Combustion apparatus with driven means for feeding fuel into the combustion chamber the fuel being fed from below through an opening in the fuel-supporting surface

Definitions

  • the burning of small portioned and therefore granular firewood, such as wood pellets, wood chips, small pieces of wood or dried corn proves to be energetically favorable and practical to use. It does not have large and unwieldy pieces of wood to be transported and stored and also no large logs to be fed to the fire.
  • the dosing of the fire power down to a low value is made possible today by a special fuel feed device for granular fuel. This makes it possible to ensure performances down to less than 1kW. It is worked with a arranged in a pipe screw conveyor for the conveyance of the granular material.
  • the central screw axis tube of the screw conveyor, on the outer wall of the screw winding is mounted and with which together the screw conveyor is rotatably mounted in the tube, thereby filling at least a quarter of the pipe diameter.
  • This screw axis tube runs up as a cone in a tip.
  • Above the snail is a circular grid with central round hole and air supply openings in the outer area of the grate.
  • the hole is dimensioned slightly smaller than the diameter of the auger and from its edge extends a flared wall as a sliding wall for the kiln to be conveyed downwards, which runs approximately or exactly parallel to the cone of the upper end of the screw axis.
  • a wood pellet stove can operate largely automatically, even at very low power of less than 1kW it is ensured that the fire does not extinguish. Also the ash removal is ensured and it is prevented that the fire vorfrisst in the feed stream of the fuel.
  • Such a wood pellet stove is therefore an efficient heating, and it is preferably placed in the living room. But here he should meet even more technical requirements.
  • Previously known wood pellet stoves must always be installed freestanding, that is, even if they are placed in front of a wall, it must be complied with a prescribed distance from the rear wall for reasons of fire police.
  • this is a technical limitation that often looks unattractive.
  • one would like to achieve not only a heat output in a Holzpelletofen but he should also exude cosiness and blend in harmoniously with the furniture landscape of a living room.
  • the fire is visible only within a limited viewing angle. The direct heat radiation of the fire can not be aligned with the current whereabouts of the residents.
  • a wood pellet oven with feeding device for the automatic metering of wood pellets from a furnace belonging to the pellet bunker characterized in that the pellet bunker are housed with feeding in a stationary base, which remains cold during operation, and the Combustion chamber with chimney connection are housed in an upper furnace part, wherein the upper furnace part via a turntable on the bottom furnace part is mounted so that it is pivotable relative to the lower, stationary furnace part.
  • this wood pellet furnace is presented in more detail and described below and its structure and function will be explained.
  • Figure 1 The wood pellet furnace consisting of lower part with the connections and the upper part mounted thereon;
  • Figure 2 The wood pellet furnace consisting of the lower part and the pivotally mounted thereon upper part, placed in front of a rear wall;
  • FIG. 3 The wood pellet stove with lower part and lifted off the upper part with the hub for the pivotal mounting of the upper part;
  • Figure 4 The hub of Figure 3 shown in an enlarged view
  • Figure 5 seen the supply device with the arranged at the upper end grate in a longitudinal section
  • Figure 6 A cross section through the screw conveyor, seen from above;
  • Figure 7 The entire screw conveyor seen from the side, in one
  • Figure 8 The lower and upper part of the furnace with disassembled
  • Figure 1 shows the wood pellet stove in an overall view. It consists of a lower part 20 and pivotally mounted on top 21. The front of the upper part 21 is made in heat-resistant glass and gives the Look into the combustion chamber, which is not shown here.
  • the lower part 20 contains the bunker for the wood pellets and the feeder for the metered feeding of wood pellets on the grid. The lower part 20 remains cold during operation and is designed here as orthorhombic body.
  • All ports 34-38 are connected to the furnace at the rear of the base 20, namely the fresh air supply pipe 36, the flue gas exhaust pipe 37, the pellets delivery electric connections 38 and the supply air supply fan and if appropriate, the flue gas path discharge, and any water connections 34, 35 for a circuit in the casing of the combustion chamber for receiving and removing heat to a central heating system.
  • the fresh air supply pipe 36 the flue gas exhaust pipe 37
  • the pellets delivery electric connections 38 and the supply air supply fan if appropriate, the flue gas path discharge, and any water connections 34, 35 for a circuit in the casing of the combustion chamber for receiving and removing heat to a central heating system.
  • opening on the rear pipe for the pellet supply be present, so then these pellets can be refilled from a separate room in the reservoir inside the lower part 20 of the furnace, which otherwise happens from the front through Removing the front cover on the lower part 20.
  • a shutter 39 Around the lower part 20 along the rear edge of a shutter 39 is arranged, which forms a clean conclusion to the rear wall, to which the oven is placed at a distance.
  • This panel 39 forms a bent to a U-shape sheet metal strip, so that the aperture 39 can be plugged from above to the back of the lower, cold furnace part 20.
  • a fire-place installation furnace had to be mounted with a prescribed distance from the wall in front of it, because it is hot.
  • the lower part 20 remains cold and can therefore easily with a panel 39 form a clean conclusion with the rear wall, so that a disturbing gap between the oven and the rear wall is omitted, which is aesthetically much tidier.
  • the oven is shown mounted in front of a rear wall 40.
  • the upper part 21 of this wood pellet opening is pivoted as a special feature relative to the lower part 20 and pivoted here from above viewed at about 20 ° in the counterclockwise direction relative to the lower part 20.
  • the pivoting range of the upper part 21 on the lower part 20 is approximately ⁇ 25 °, ie a total of about 50 °, but depending on the design of the intermediate turntable also be full 180 °, so so that the upper part 21 can be directed with its glass front, which releases the view into the combustion chamber, all the way to the left or right.
  • FIG 3 shows this wood pellet stove with lower part 20 and lifted off the upper part 21 facing the turntable 22 for the pivotal mounting of the upper part 21.
  • This hub 22 is constructed on top of the lower part 20 and its structure is based on Figure 4 described in more detail. It consists of a base plate 23 with a central hole 24, an intermediate plate 25 with also a central hole 24 which is pivotable about the same. This washer 25 has peripherally arranged holes 26, in each of which a ball 27 is caught. Finally, a cover plate 28 which annularly surrounds the central hole 24 around a large part of the circumference, resting on these balls 27 so that it is pivotable about the central hole 24 by rolling on the balls 27.
  • the balls 27 roll inside the holes 26 of the washer 25 in which they are caught, and thus roll on the base plate 23 from.
  • the intermediate plate 25 pivots with the rolling balls 27 in their holes, always by half the extent of the pivoting of the cover plate 28.
  • This ball-mounted pivoting of the upper part 21 of the wood pellet stove on its lower part 20 ensures a low-friction running and the balls 27 wear the load of the furnace top 21, which is mounted on the cover plate 28.
  • the hub 22 leaves a curved slot 42 open, through which the flue gas duct 37, and possibly the lines 34,35 are performed for the water cycle, and the hole 42 is large enough that it can be pivoted with the turntable to these stationary lines. Another such slot 43 is used for receiving the fresh air line.
  • Down in hole 24 is the actual grate 1, to which the wood pellets are automatically fed, as shown below.
  • This supply device is shown in Figure 5 with the arranged at the upper end grate 1 seen in a longitudinal section, for granular kiln for a kiln designed for performances down to less than 1KW.
  • the kiln can consist of wood pellets, but also of wood chips, small pieces of wood or dried corn or other grains.
  • the grate 1 of the furnace cooperates with the feed device, and this is equipped with a screw conveyor 2.
  • the screw conveyor 2 is arranged in the example shown perpendicular to the grate surface and the central screw axis tube 3, on the outer wall 4, the screw 5 is mounted and with which together the screw conveyor 2 is rotatably mounted in the conveyor tube 8, fills a considerable part of the conveyor tube 8, which the whole conveyor screw 2 umschiiesst.
  • the conveyor tube 8 with the screw conveyor 2 can also be arranged obliquely to the perpendicular. It is then achieved on the bottom of additional friction of the fuel with the delivery pipe 8, which is beneficial to the promotion.
  • the pipe diameter of the worm axis pipe 3 measures one third of the screw diameter or the pipe diameter, and measures, for example, 60 mm.
  • the diameter of the screw axis tube 3 should be at least a quarter of the screw conveyor diameter, because thus also a sufficient torque on the actual screw 2 and on the helical to the screw axis tube 3 wound smoothest possible conveying surface 5 are transmitted.
  • On the conveying surface 5 of the screw 2 here is a single wood pellet 18 drawn to give an approximate size comparison.
  • This screw axis tube 3 runs up as a cone 10 in a tip, wherein above the screw 2, the grate 1 is arranged horizontally with a central circular hole 6. It fits exactly on the upper end of the auger axle tube 8 and is placed on this.
  • the grate 1 is preferably circular as shown and interspersed with air supply openings 7 in the outer region.
  • the circular hole 6 in the grate 1 measures approximately half of the delivery pipe diameter. From this circular hole 6 includes a downwardly projecting, funnel-shaped edge 9, which opens as a funnel down.
  • the funnel wall runs almost or exactly parallel to the cone 10 on the worm axis tube 3 As shown, the cone 10 encloses an acute angle with the running direction of the funnel inner wall, the angle tip being at the top. This angle may only be very small, otherwise a jamming of the fuel in the area between the cone 10 and the funnel inner wall is provoked.
  • the actual screw 2 or its winding conveying surface 5 terminates with an approximately perpendicular to the grate surface extension 11.
  • This auger 2 as shown here rotates clockwise in operation as seen from above. Of course, it could also be designed to boost in a counterclockwise direction.
  • the fuel to be conveyed remains with respect to its Drehiage in the conveyor tube 8 approximately at the same Steiie, and the conveying surface 5 of the screw 2 slides under the kiln through, where it is raised in the conveyor tube 8 up until it finally at the height of the hole 6 arrives.
  • the inside of the tube 8 is equipped with a plurality of preferably axially extending plateaus or grooves 14, on which the auger turns past with a minimum distance, and between the plateaus or grooves a distance of the height of the plateaus or grooves to the inner wall of the tube 8 leaves open.
  • the inner wall of the tube 8 may also be provided with a rough surface.
  • the auger 2 rotates only very slowly, with a rotational speed of less than 1 rev / min. "1 Arrived at the top, the firing material is captured by the extension 11 and pushed clockwise from above, where the appendage the edge of the As a result of this slow rotation of the extension 11, it is ensured that the parts of the burning material which have advanced due to the forces acting on them move radially outwards and finally onto the region 12
  • the area, a concentric ring, which immediately adjoins the hole 6 in the grate 1, is free of ventilation holes 7.
  • the parts of the burning material burn there heavy and must first be pushed further radially outwards at the next round of the Fortsatzes 11, if from the same again parts of kiln are pushed a little bit on the grate surface.
  • the kiln parts are moved every minute, handling handling of the extension 11, very slowly on the grate and finally on the fire zone, which is formed by that area 13, which is equipped with air holes 7.
  • the diameter of the whole grate 1 is about twice the diameter of the conveyor tube 8. So if this measures 60mm, then the grate 1 measures about 120mm in diameter. Due to the gentle and continuous supply of fresh fuel a nice, high and regular flame pattern on the grate 1 is achieved, and no flickering, technically effective flames.
  • Figure 7 shows the screw conveyor 2 in its entire height. It measures between 200mm to 800mm in height and between 55mm and 85mm in diameter.
  • the auger axle tube 3 measures one-quarter to a little over one-third of the diameter in diameter, and the pitch of the auger per revolution is about one-half auger diameter.
  • Down the conveyor pipe 8 can be completely in a pile of kiln parts, or in a box 15, the of above or over, for example, an inclined surface 16 can be charged as Brennüttgosse with fuel.
  • the conveying tube 8 is open at the bottom on one side, and through this opening 17 in the conveying tube 8 trickle the kiln pieces, in the example shown cylindrical wood pellets, the screw 2 after.
  • the kiln feed device for such wood stoves for powers of less than 1kW is equipped with an electric motor that drives the worm 2 via a reduction gear.
  • the rotational speed of the screw conveyor 2 can be adjusted from 0.5 to 2 revolutions per minute and thus the supply amount of fuel per time and thus the heating power can be regulated.
  • FIG 8 shows the lower and upper part of the furnace with disassembled trim parts 29-32.
  • the oven is constructed in such a way that it can be assembled on site without the use of tools. Only the inner structure of the lower part 20 and upper part 21 is factory assembled together, where also wherever possible plug, hooking and sliding connections are realized to get along as possible without screws.
  • the combustion chamber 19 is enclosed on its sides and the back of fireclay bricks or of a sheet-metal hollow body 41. Thus, the generated heat can be supplied via a water cycle to a central heating.
  • the side parts 31, 32 are preferably made in sheet metal, but instead of sheet metal and other materials can be used, such as stone slabs, wood or plastic plates or plates of other materials.
  • FIG. 9 shows a particular detail of the kiln feed device.
  • the ash often clumps into a structure and is then distributed irregularly on the grate. If the stove is equipped with an ignition element for automatic ignition of the fuel, then. can cause an ash accumulation in front of the ignition element, which impairs or prevents its function. Larger lumps of ash are created, which soon exhaust the volume in the ash catcher.
  • a steel bracket 49 which extends from the upper end of the auger shaft further upwards and thus first forms a screw conveyor axially extending portion 50, and then via an arc or here radially outwardly extending central portion 51 in a to the axial Section 50 parallel outer section 52 leads.
  • the lower end 53 of this outer portion 52 terminates just above the grate surface, ideally about 8mm above it.
  • the distance may vary between 4mm to 12mm.
  • FIG. 10 shows this fuel feed device with the steel bracket 49 in a longitudinal section.
  • the outer portion 52 of the bracket 49 is above the outer third of the radius of the grate 1 and its end over the grate surface, in detail about 8mm above the grate surface.
  • the tip 55 of the ignition element 54 is located close to the past rotating outer portion 52 of the bracket 49 and this area is therefore kept free of ash or cyclically.
  • the kiln feed device for such wood stoves for powers of less than 1 kW is equipped with an electric motor which drives the worm 2 via a reduction gear.
  • the rotational speed of the screw conveyor 2 can be adjusted from 0.5 to 2 revolutions per minute and thus the supply amount of fuel per time and thus the heating power can be regulated.
  • the steel strap offers the advantage that the ash is evenly distributed on the grate 1, the ash quality is finer and thus less volume is produced, and the ash falls evenly from the outer edge of the grate down on this fuel feed device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Solid-Fuel Combustion (AREA)

Abstract

L'invention concerne un poêle à granulés de bois qui comprend un dispositif d'amenée pour l'ajout dosé automatique de granulés de bois provenant d'un réservoir de granulés associé au poêle. Ce réservoir de granulés muni d'un dispositif d'amenée et d'une grille est logé dans une partie inférieure fixe (20) du poêle qui reste froide ou, plus précisément, ne devient pas brûlante en fonctionnement. La chambre de combustion avec raccord de cheminée est logée dans une partie supérieure (21) du poêle. La partie supérieure (21) du poêle est montée sur la partie inférieure (20) du poêle par le biais d'un disque rotatif de sorte qu'elle peut pivoter par rapport à la partie inférieure fixe (20) du poêle. Il est ainsi possible d'orienter la chambre de combustion et la vitre selon les besoins dans la direction que l'on désire.
EP10757703.3A 2009-08-19 2010-08-12 POÊLE À PELLETS DE BOIS POUR DES PUISSANCES ALLANT JUSQU'À MOINS DE 1 kW Active EP2467644B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH01288/09A CH701674B1 (de) 2009-08-19 2009-08-19 Holzpellet-Ofen mit Zufuhreinrichtung.
PCT/CH2010/000197 WO2011020202A1 (fr) 2009-08-19 2010-08-12 POÊLE À GRANULÉS DE BOIS POUR DES PUISSANCES ALLANT JUSQU'À MOINS DE 1 kW

Publications (2)

Publication Number Publication Date
EP2467644A1 true EP2467644A1 (fr) 2012-06-27
EP2467644B1 EP2467644B1 (fr) 2017-10-04

Family

ID=43413915

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10757703.3A Active EP2467644B1 (fr) 2009-08-19 2010-08-12 POÊLE À PELLETS DE BOIS POUR DES PUISSANCES ALLANT JUSQU'À MOINS DE 1 kW

Country Status (5)

Country Link
US (1) US8826899B2 (fr)
EP (1) EP2467644B1 (fr)
CA (1) CA2771438C (fr)
CH (1) CH701674B1 (fr)
WO (1) WO2011020202A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH703513B1 (de) * 2010-07-27 2014-09-30 St V Sa Ofen für granulatförmiges Brenngut, für Leistungen bis hinunter zu weniger als 1 kW, mit Einrichtung für die Brenngutzufuhr sowie die Aschenzerkleinerung und -verteilung.
US9441838B2 (en) 2013-11-18 2016-09-13 Edward Baker Pellet bin insert and storage system for smoker grills
CN106838947B (zh) * 2017-03-31 2019-01-29 安徽省沃昇机电科技有限公司 一种方便清理的粮食烘干用热风炉

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2371191A (en) * 1945-03-13 Stoker
GB520421A (en) 1939-03-31 1940-04-23 Jacobus Nicolaas Van Rijswijk Improvements relating to furnaces and stoking installations therefor
JPS60117003A (ja) 1983-11-28 1985-06-24 Ishida Tekkosho:Kk ペレット燃料を使用する燃焼装置
AT410364B (de) 1999-05-03 2003-04-25 Etr En Technik Und Recycling A Feststoffbrenner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011020202A1 *

Also Published As

Publication number Publication date
CH701674B1 (de) 2014-09-15
US8826899B2 (en) 2014-09-09
CA2771438A1 (fr) 2011-02-24
US20120199107A1 (en) 2012-08-09
CH701674A2 (de) 2011-02-28
EP2467644B1 (fr) 2017-10-04
CA2771438C (fr) 2017-07-04
WO2011020202A1 (fr) 2011-02-24

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