US20160238238A1 - Combustion Chamber for Burning Solid Fuels - Google Patents

Combustion Chamber for Burning Solid Fuels Download PDF

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Publication number
US20160238238A1
US20160238238A1 US15/061,072 US201615061072A US2016238238A1 US 20160238238 A1 US20160238238 A1 US 20160238238A1 US 201615061072 A US201615061072 A US 201615061072A US 2016238238 A1 US2016238238 A1 US 2016238238A1
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Prior art keywords
volatiles
combustion chamber
burning
combustion
outlet
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Abandoned
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US15/061,072
Inventor
Francis Donal Duignan
Michael Patrick O'Halloran
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Francis Donal Duignan
Michael Patrick O'Halloran
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Filing date
Publication date
Priority to IE2007/0094 priority Critical
Priority to IE20070094A priority patent/IE20070094A1/en
Priority to PCT/IE2008/000012 priority patent/WO2008099373A1/en
Priority to US52657109A priority
Application filed by Francis Donal Duignan, Michael Patrick O'Halloran filed Critical Francis Donal Duignan
Priority to US15/061,072 priority patent/US20160238238A1/en
Publication of US20160238238A1 publication Critical patent/US20160238238A1/en
Abandoned legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23BMETHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B60/00Combustion apparatus in which the fuel burns essentially without moving
    • F23B60/02Combustion apparatus in which the fuel burns essentially without moving with combustion air supplied through a grate
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23BMETHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B1/00Combustion apparatus using only lump fuel
    • F23B1/02Combustion apparatus using only lump fuel for indirect heating of a medium in a vessel, e.g. for boiling water
    • F23B1/08Internal furnaces, i.e. with furnaces inside the vessel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23BMETHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B1/00Combustion apparatus using only lump fuel
    • F23B1/16Combustion apparatus using only lump fuel the combustion apparatus being modified according to the form of grate or other fuel support
    • F23B1/26Combustion apparatus using only lump fuel the combustion apparatus being modified according to the form of grate or other fuel support using imperforate fuel supports
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23BMETHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B1/00Combustion apparatus using only lump fuel
    • F23B1/30Combustion apparatus using only lump fuel characterised by the form of combustion chamber
    • F23B1/36Combustion apparatus using only lump fuel characterised by the form of combustion chamber shaft-type
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23BMETHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B10/00Combustion apparatus characterised by the combination of two or more combustion chambers
    • F23B10/02Combustion apparatus characterised by the combination of two or more combustion chambers including separate secondary combustion chambers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23BMETHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B5/00Combustion apparatus with arrangements for burning uncombusted material from primary combustion
    • F23B5/04Combustion apparatus with arrangements for burning uncombusted material from primary combustion in separate combustion chamber; on separate grate
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23BMETHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B50/00Combustion apparatus in which the fuel is fed into or through the combustion zone by gravity, e.g. from a fuel storage situated above the combustion zone
    • F23B50/12Combustion apparatus in which the fuel is fed into or through the combustion zone by gravity, e.g. from a fuel storage situated above the combustion zone the fuel being fed to the combustion zone by free fall or by sliding along inclined surfaces, e.g. from a conveyor terminating above the fuel bed
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23BMETHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B80/00Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel
    • F23B80/04Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel by means for guiding the flow of flue gases, e.g. baffles
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23LSUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L9/00Passages or apertures for delivering secondary air for completing combustion of fuel 
    • F23L9/04Passages or apertures for delivering secondary air for completing combustion of fuel  by discharging the air beyond the fire, i.e. nearer the smoke outlet

Abstract

A combustion chamber (10) for burning solid fuels having a high volatiles content has a hollow body (11) with a cylindrical wall section (12) and a top section (13) located at end (14) of the cylindrical wall section (12). The hollow body (11) has a primary air inlet (20), a fuel inlet (23) and four volatiles outlets (25) (one shown), mounted therein. Each volatiles outlet (25) has a plurality of apertures (26) of differing sizes arranged in a plate (27). In use, the burning volatiles exit the apertures (26) in a turbulent flow resulting in efficient combustion of the volatiles. Additionally, a heat transferring surface (33) on a water jacket (32) is shaped around the combustion chamber (10) so as to define a channel (34) there between. This arrangement results in an efficient transfer of heat from the turbulent flow of volatiles, which is forced to circulate around the channel (34).

Description

    TECHNICAL FIELD
  • This invention relates to a combustion chamber for burning solid fuels having a volatiles content and, in particular, to a combustion chamber for burning solid fuels having a high volatiles content, and also to a fire chamber incorporating such a combustion chamber.
  • By solid fuels having a high volatiles content in this context is meant solid fuels such as wood pellets, pellets made from switchgrass, miscanthus, maize stalks, straw or the like, and nut shells such as almond shells, all collectively referred to as solid biomass fuels, and also fossil fuels such as peat or bituminous coal. In contrast, an example of a low volatiles solid fuel would be anthracite coal.
  • BACKGROUND ART
  • In recent years, worldwide concern has arisen relating to climatic changes ascribed to the increase in atmospheric carbon dioxide released by fossil fuels. The price of such fuels has been increasing, and projections as to the remaining world supplies of such fossil fuels have led to increased interest in the development of devices utilising alternative fuels. Furthermore, use of renewable fuels in such devices could slow down the increase in carbon dioxide levels in the atmosphere.
  • Devices, which burn wood are known. However, cord wood burns inefficiently in conventional combustion chambers and is inconvenient to use in comparison with oil or gas burning devices.
  • The use of biomass fuels is also increasing. However, again, biomass fuel tends to burn inefficiently in conventional devices and this is due to its high volatiles content. Much of the heat is released into the burning gases (the flames) and is lost up the chimney or flue.
  • Another reason that conventional boilers and stoves are unsuitable for burning pelleted biomass fuels such as wood pellets, wood chips, etc., is that such pellets tend to smoulder at reduced output particularly when they have a relatively high moisture content. Consequently devices have been developed for burning these fuels more efficiently.
  • Thus, for example, a typical wood pellet stove includes a hopper, an auger, a firebox or grate, a combustion fan and a heat exchanger which, respectively, store, feed, burn the fuel and transfer the heat to the space to be heated. The auger operates in a timed manner to control the delivery of the pellet fuel from the hopper into the firebox. The rate of delivery of the fuel to the firebox is matched to the rate of consumption of the fuel for a particular output. The combustion fan provides a measured amount of air to the firebox. An example of such a stove is the Pellet stove Mod. 1000 manufactured by Caminetti Montegrappa s.r.l of via A. da Bassano, July 9, 36020 Pove Del Grappa (VI), Italy.
  • However, a problem with such stoves and boilers is that the transfer of heat from the burning volatiles is relatively low, particularly at low output, and acceptably high efficiencies can only be achieved by passing the flue gases through extensive heat exchangers.
  • It is an object of the present invention to overcome the disadvantages of the devices hereinbefore described.
  • DISCLOSURE OF INVENTION
  • Accordingly, the invention provides a combustion chamber for burning solid fuels having a high volatiles content, the combustion chamber comprising an enclosed hollow body in which the fuel is to be burnt, the body having a fuel inlet, a primary air inlet, a secondary air inlet and a volatiles outlet mounted therein, the volatiles outlet having a plurality of apertures, such that, in use, the burning volatiles exit the apertures in a turbulent flow resulting in efficient combustion of the volatiles.
  • An advantage of the combustion chamber according to the invention is that the volatiles have to exit the chamber via the apertures in the volatiles outlet and this causes an increase in the velocity of the burning volatiles as they exit. It also causes the turbulent flow of volatiles. The result is that the volatiles burn more efficiently and at a higher temperature than is achieved in a conventional device burning the same fuel. A consequence of this greater efficiency is that the levels of harmful products, such as the nitrous oxides, in the flue gases are reduced relative to known devices.
  • A combustion chamber according to the invention can be used in devices such as boilers, air heaters and stoves, in hotplates, in devices for providing a source of heat for an industrial process, in an incinerator or the like.
  • Preferably, the apertures are of differing sizes.
  • Having apertures of differing sizes in the volatiles outlet results in more efficient mixing of the volatiles in the turbulent flow leading to more efficient combustion.
  • The apertures can be arranged in a particular pattern so as to optimise the performance of the combustion chamber in a particular application.
  • Further, preferably, the secondary air inlet is adjacent the volatiles outlet.
  • The positioning of the secondary air inlet can be important for a particular application of the combustion chamber and such positioning will affect the characteristics of the turbulent flow exiting from the volatiles outlet.
  • In one embodiment of the invention the volatiles outlet has means for temporarily restricting the flow of volatiles therethrough.
  • An advantage of the restricting means is that efficient combustion can be maintained at varying outputs. Thus, at low output the volatiles outlet can be restricted so as to maintain a turbulent flow of volatiles therethrough.
  • Preferably, upstanding formations on the outer surface of the body adjacent the apertures are shaped so as to direct the emerging volatiles along the outer surface.
  • By diverting the burning volatiles along the outer surface of the body the body is maintained at a higher temperature which leads to more efficient combustion of the fuel. This is a requirement at low output particularly when the fuel has a relatively high moisture content.
  • In circumstances where the problem of high moisture content in the fuel is acute, the primary air can also be preheated by the burning volatiles by passing the primary air supply duct through or against the burning volatiles.
  • In a further embodiment of the invention, two or more volatiles outlets are mounted in the hollow body.
  • The provision of a number of volatiles outlets results in more even distribution of the heat from the burning fuel.
  • This arrangement also lends itself to maximising the efficiency of the combustion chamber at all available outputs, while restricting the emission of oxides of nitrogen by reducing the peak temperature of combustion.
  • In another aspect of the invention there is provided a fire chamber for a device for burning solid fuels having a high volatiles content, the fire chamber comprising a housing, a combustion chamber within the housing, the combustion chamber having an enclosed hollow body in which the fuel is to be burnt, the body having a fuel inlet, a primary air inlet, a secondary air inlet and a volatiles outlet mounted therein, the volatiles outlet having a plurality of apertures, such that, in use, the burning volatiles exit the apertures in a turbulent flow resulting in efficient combustion of the volatiles.
  • By employing the combustion chamber with the volatiles outlet, which causes a turbulent flow in the emerging volatiles, the fire chamber is heated more efficiently than a conventional fire chamber consuming a similar amount of fuel.
  • Preferably, an inner heat transferring surface of the housing is shaped about the combustion chamber so as to define a channel therebetween, such that, in use, the burning volatiles exiting the apertures are forced to circulate around the combustion chamber within the channel.
  • An advantage of this arrangement is that the heat released by the volatiles is transferred both to the heat transferring surface and back into the combustion chamber. This provides a means for increasing the temperature of the zone into which the fresh fuel is introduced, particularly at low output, resulting in an increase in the overall temperature of combustion.
  • In one embodiment of the fire chamber according to the invention, a set of upstanding curved formations is mounted on the inner heat transferring surface around the combustion chamber within the channel.
  • The shape and positioning of the set of upstanding curved formations within the channel further directs the circulation of the volatiles around the combustion chamber and also enhances the turbulent flow of the volatiles.
  • In a further embodiment of the fire chamber according to the invention, the apertures are of differing sizes.
  • In a further embodiment of the fire chamber according to the invention, the secondary air inlet is adjacent the volatiles outlet.
  • In a further embodiment of the fire chamber according to the invention the volatiles outlet has means for temporarily restricting the flow of volatiles therethrough.
  • Preferably, upstanding formations on the outer surface of the body adjacent the apertures are shaped so as to direct the emerging volatiles along the outer surface.
  • In a further embodiment of the fire chamber according to the invention, two or more volatiles outlets are mounted in the hollow body.
  • This arrangement results in the efficient circulation of the burning volatiles around the combustion chamber.
  • At certain outputs, the tail of the flame emerging from each volatiles outlet will run into the flame emerging from the next volatiles outlet. This arrangement can provide a means for achieving complete combustion at the tail of each flame. It can also cause a reduction in the peak temperature of combustion, thereby preventing the formation and emission of nitrous oxides.
  • Preferably, the volatiles outlets are arranged equidistantly around the surface of the hollow body.
  • The equidistant arrangement of the volatiles outlets optimises the flame merging effect described above.
  • Alternatively, the volatiles outlets are positioned about the surface of the hollow body so as to facilitate the optimisation of the turbulent flow of volatiles thereabout for each output setting.
  • Thus, for a particular output setting the volatiles flow through a selected number of the volatiles outlets could be restricted so as to optimise the flame merging effect while minimising the emission of nitrous oxides.
  • In a further embodiment of the fire chamber in accordance with the invention, means for moving the combustion chamber towards and away from the inner heat transferring surface is provided.
  • An advantage of this arrangement is that when a low output is required the combustion chamber can be moved closer to the inner heat transferring surface. This has the effect of restricting the flow of volatiles through the volatiles outlet. Conversely, when a higher output is required the combustion chamber can be moved further away from the inner heat transferring surface.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The invention will be further illustrated by the following description of embodiments thereof, given by way of example only with reference to the accompanying drawings in which:
  • FIG. 1 is a vertical section through a boiler containing a combustion chamber and a fire chamber in accordance with the invention;
  • FIG. 2 is a horizontal section on line II-II of FIG. 1;
  • FIG. 3 is a vertical section through a second embodiment of a combustion chamber in accordance with the invention;
  • FIG. 4 is a vertical section through a third embodiment of a combustion chamber in accordance with the invention; and
  • FIG. 5 is a horizontal section on line V-V of FIG. 4.
  • MODES FOR CARRYING OUT THE INVENTION
  • Referring to FIG. 1 there is illustrated, generally at 10, a combustion chamber in accordance with the invention, the combustion chamber 10 having an enclosed hollow body 11, which is generally circular in cross-section. The hollow body 11 has a cylindrical wall section 12, and a top section 13 at end 14 of the cylindrical wall section 12. The cylindrical wall section 12 narrows at end 15 to form a frusto-conical section 16, which terminates in a neck section 17, within which the ash collects in use to be removed through an exit pipe 18, which is regulated by a valve 19.
  • A primary air inlet 20 is connected to the neck section 17 at point 21 and is regulated by a valve 22 housed therein.
  • A fuel inlet 23 is mounted in the top section 13 at point 24 and in this embodiment the fuel inlet 23 also acts as a secondary air inlet.
  • Four volatiles outlets 25 (one visible) are mounted in the cylindrical wall section 12, adjacent the top section 13. Each volatiles outlet 25 has a plurality of apertures 26 of differing sizes arranged in a plate 27. The plate 27 is made of tungsten to withstand the heat generated in use.
  • A grate 28 is mounted within the hollow body 11 and supports the wood pellets 29 to be burnt. As the wood pellets 29 burn, they break up, fall through the grate 28 and are held on a mesh 30 while they burn for a further period, until they finally fall through the mesh 30 as ash (not shown), to be collected in the neck section 17.
  • In the embodiment illustrated the combustion chamber 10 forms part of a fire chamber, shown generally at 31, in accordance with the invention. The fire chamber 31 has a water jacket 32 having a heat transfer surface 33 which encircles the combustion chamber 10. Around the area of cylindrical section 12, in which the volatiles outlets 25 are mounted, the heat transfer surface 33 is formed so as to create a channel 34 between the heat transfer surface 33 and the cylindrical section 12.
  • The water jacket 32 has a water inlet 35 and a water outlet 36.
  • In use the wood pellets 29 are introduced into the combustion chamber 10 through the fuel inlet 23 at a rate appropriate for the required heat output of the device. Primary air at the appropriate pressure is introduced into the combustion chamber 10 via the primary air inlet 20 and is blown up through the mesh 30, the grate 28 and the pellets 29. Thus, the primary combustion takes place above the grate 28 in the area of the top section 13. Again, depending on the output required, secondary air is introduced into the combustion chamber 10 through the fuel inlet 23 and mixes with the volatiles above the pellets 29. The burning volatiles then exit the combustion chamber 10 through the volatiles outlets 25 in a turbulent flow and circulate around the cylindrical section 12 raising the temperature of both the heat transfer surface 33 and the combustion chamber 10 itself.
  • Thus, the burning of the volatiles is concentrated in the area above the pellets 29 and in the channel 34. The burning volatiles will remain in this area due to thermal buoyancy until they start to cool. As the volatiles cool they drop down in the combustion chamber 10 and the exhaust gases are vented through a flue 37, which is regulated by a paddle valve 38.
  • Referring to FIG. 2 the arrangement of the volatiles outlets 25 around the cylindrical section 12 can be seen more clearly. The arrows 39 indicates the path of the turbulent flow of the volatiles through the channel 34 around the combustion chamber 10. The volatiles outlets 25 are offset in the cylindrical section 12 such that the turbulent flow of volatiles, as it exits the volatiles outlets 25 is already directed around the combustion chamber 10, as desired.
  • Referring to FIG. 3 there is illustrated, generally at 40, a second embodiment of a combustion chamber in accordance with the invention. The combustion chamber 40 is designed to burn wood pellets and to provide a blown flame and is suitable for use as a replacement for an oil burner in an oil-fired heating boiler.
  • The combustion chamber 40 has an enclosed hollow body 41, which has a generally circular cross-section and a domed top section 42. A frusto-conical section 43 extends laterally from the top section 42 and terminates in a volatiles outlet 44 having a plurality of apertures 45. A fuel inlet 46 is located at point 47 on the top section 42 and a primary air inlet 48 is located at point 49 on the body section 41.
  • A secondary air inlet 50 is mounted in the frusto-conical section 43 and is positioned such that a secondary air nozzle 51 is located, within the hollow body 41, adjacent the volatiles outlet 44.
  • A grate 52 is mounted within the hollow body 41 and supports the wood pellets 53 to be burnt. A drop-on umbrella shaped plate 54 is mounted centrally on the grate 52 at position 55 below the fuel inlet 46. In use, the drop-on plate 54 prevents the burning wood pellets 53 from being crushed by fresh pellets 53 dropping from the fuel inlet 46 and also helps to disperse the pellets 53 over the grate 52.
  • In use, the burning of the pellets 53 on the grate 52 results in burning volatiles above the grate 52. These volatiles mixed with the primary and secondary air are forced through the apertures 45 of the volatiles outlet 44 and exit as a rapidly burning turbulent flow, which can be directed onto a heat transferring surface within the fire chamber of the heating boiler.
  • Referring to FIG. 4 there illustrated generally at 60, a third embodiment of a combustion chamber in accordance with the invention, the combustion chamber 60 having an enclosed hollow body 61, which is generally circular in cross-section. The hollow body 61 has a cylindrical wall section 62 and a top section 63 at end 64 of the cylindrical section 62.
  • A volatiles outlet 65 is mounted in the top section 63 and has a plurality of apertures 66 therein. A pipe 67 passes through a central opening 68 in the top section 63. The pipe 67 serves as a fuel inlet 69 and a secondary air inlet 70.
  • A grate 71 is mounted within the hollow body 61 and supports the wood pellets 72 to be burnt.
  • A primary air inlet 73 is mounted at the bottom end 74 of the hollow body 61.
  • In the embodiment illustrated the combustion chamber 60 forms part of a fire chamber, shown generally at 75, in accordance with the invention. The fire chamber 75 has a water jacket 76 having an inner heat transferring surface 77 which encircles the combustion chamber 60. The inner heat transferring surface 77 has an upper section 78, which has an inverted frusto-conical shape and a lower cylindrical section 79.
  • A set of upstanding curved formations 80 is mounted on an internal surface 81 of a top section 82 of the inner heat transferring surface 77. The set of upstanding curved formations 80 is arranged equidistantly around the combustion chamber 60 and this can be more clearly seen with reference to FIG. 5.
  • A means (not shown) for moving the combustion chamber along its vertical axis is provided. Thus, when a low output is required the combustion chamber 60 can be moved closer to the top section 82 of the inner heat transferring surface 77. This has the effect of restricting the flow of volatiles through the volatiles outlet 65. Conversely, when a higher output is required the combustion chamber 60 can be moved further away from the top section 82 of the inner heat transferring surface 77.
  • In use the wood pellets 71 are introduced into the combustion chamber 60 through the fuel inlet 69 at a rate appropriate for the required heat output of the device. Primary air at the appropriate pressure is introduced into the combustion chamber 60 via the primary air inlet 73 and is blown up through the grate 71 and the pellets 72. Thus, the primary combustion takes place above the grate 71. Again, depending on the output required, secondary air is introduced into the combustion chamber 60 through the secondary air inlet 70 and mixes with the volatiles above the pellets 72. The burning volatiles then exit the combustion chamber 60 through the volatiles outlet 65 in a turbulent flow and circulate around the fire chamber 75 raising the temperature of both the inner heat transferring surface 77 and the combustion chamber 60 itself.
  • The shape and positioning of the set of upstanding curved formations 80 within the fire chamber 75 causes the volatiles to circulate around the combustion chamber 60 and also enhances the turbulent flow of the volatiles. As the volatiles cool they drop down to the end 74 of the combustion chamber 60, where they pass through an exit pipe (not shown).

Claims (4)

What is claimed is:
1. A combustion chamber for burning solid fuels having a high volatiles content, the combustion chamber comprising:
an enclosed hollow body in which fuel is to be burned,
the body having a fuel inlet, an air inlet configured to introduce primary and secondary air of combustion to the combustion chamber, and a burning volatiles outlet mounted therein, the burning volatiles outlet having a plurality of apertures,
wherein the burning volatiles outlet is configured to rapidly turbulate a confluence of burning volatiles and secondary air of combustion as the confluence exits the combustion chamber in a rapidly turbulating flow resulting in efficient combustion of the volatiles.
2. A combustion chamber according to claim 1, wherein the apertures are of differing sizes.
3. A combustion chamber according to claim 1, wherein the burning volatiles outlet includes means for temporarily restricting the flow of burning volatiles therethrough at reduced boiler output.
4. A combustion chamber according to claim 1, wherein the air inlet provides primary air of combustion, and a separate inlet adjacent the burning volatiles provides secondary air of combustion within the combustion chamber.
US15/061,072 2007-02-15 2016-03-04 Combustion Chamber for Burning Solid Fuels Abandoned US20160238238A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
IE2007/0094 2007-02-15
IE20070094A IE20070094A1 (en) 2007-02-15 2007-02-15 A combustion chamber for burning solid fuels
PCT/IE2008/000012 WO2008099373A1 (en) 2007-02-15 2008-02-14 A combustion chamber for burning solid fuels
US52657109A true 2009-08-10 2009-08-10
US15/061,072 US20160238238A1 (en) 2007-02-15 2016-03-04 Combustion Chamber for Burning Solid Fuels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15/061,072 US20160238238A1 (en) 2007-02-15 2016-03-04 Combustion Chamber for Burning Solid Fuels

Related Parent Applications (2)

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PCT/IE2008/000012 Continuation WO2008099373A1 (en) 2007-02-15 2008-02-14 A combustion chamber for burning solid fuels
US52657109A Continuation 2009-08-10 2009-08-10

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US20160238238A1 true US20160238238A1 (en) 2016-08-18

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EP (1) EP2118564B1 (en)
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IE (1) IE20070094A1 (en)
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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201539853U (en) * 2009-06-30 2010-08-04 王朝晖 Fuel cage and combustor thereof
CN102012038A (en) * 2010-06-30 2011-04-13 广州迪森热能技术股份有限公司 Air distribution system of biomass moulding fuel boiler
DE102011108637A1 (en) * 2011-05-30 2015-08-13 Robert Bosch Gmbh Burner for a biomass fuel boiler and biomass fuel boiler
ES2432475B1 (en) * 2012-05-31 2014-11-18 Jose Enrique MORATALLA MARTINEZ Biomass boiler for multiple fuels
US9845957B2 (en) * 2014-12-05 2017-12-19 Richard L. Hill Pellet stove
HU1700093A2 (en) * 2017-03-02 2018-09-28 Primus Net Kft Pellet boiler with grid burner and proceedings of the combustion to maintain

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3543700A (en) * 1969-07-07 1970-12-01 Environmental Control Products Air purifying incinerator apparatus
US3769922A (en) * 1971-12-30 1973-11-06 Combustion Power Inc Fluid bed reactor pre-heating method and apparatus
US4233914A (en) * 1978-10-02 1980-11-18 Wellons, Inc. Pressurized waste wood furnace system
US4375949A (en) * 1978-10-03 1983-03-08 Exxon Research And Engineering Co. Method of at least partially burning a hydrocarbon and/or carbonaceous fuel
JPS608403B2 (en) * 1980-08-25 1985-03-02 Gensaku Ishizuka
JPS645203B2 (en) * 1981-06-11 1989-01-30 Satake Eng Co Ltd
JPS5847090A (en) * 1981-09-17 1983-03-18 Hayashi Seisakusho:Kk Combustible gas generator
US4515093A (en) * 1982-03-04 1985-05-07 Beardmore David H Method and apparatus for the recovery of hydrocarbons
US4565184A (en) 1984-05-17 1986-01-21 Collins Bruce H Combustible particulate fuel heater
EP0446435B1 (en) * 1990-03-10 1993-05-26 H. Krantz GmbH & Co. Device for burning oxidizable components in exhaust air
DE4200721C2 (en) * 1991-02-19 2002-11-28 Riener Karl Stefan Solid fuel furnace, especially for pellets
DE9218953U1 (en) 1991-02-19 1996-05-23 Riener Karl Stefan Solid fuel furnace, especially pellets
US5178076A (en) * 1991-09-06 1993-01-12 Hand David J Bio-mass burner construction
DE4215508C1 (en) * 1992-05-12 1993-05-27 Georg Fischer Gmbh & Co Maschinen- U. Kesselfabrik, 8870 Guenzburg, De Solid fuel heating boiler - has curved guide attached to grate reaching up beyond great plane and into bottom of combustion chamber
US5413089A (en) * 1993-03-04 1995-05-09 Harman Stove And Welding, Inc. Wood and coal burning stove
CN2540568Y (en) * 2002-04-29 2003-03-19 顾廷路 Gasification coal fired stove
US7438024B2 (en) * 2005-10-20 2008-10-21 Robert Bast Wood-burning boiler
AT502684B1 (en) * 2006-02-16 2007-05-15 Freller Walter Ing Device for combusting organic materials comprises a countercurrent heat exchanger having a heat exchanger wall on the outer side of the heat insulation of the combustion chamber with an upper waste gas outlet opening into a housing
WO2008001276A2 (en) 2006-06-26 2008-01-03 Koninklijke Philips Electronics N.V. A solid fuel stove with improved combustion

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JP5637690B2 (en) 2014-12-10
US9310071B2 (en) 2016-04-12
EP2118564A1 (en) 2009-11-18
CA2677864C (en) 2018-06-26
JP2010519492A (en) 2010-06-03
EP2118564B1 (en) 2017-09-20
CN101657680B (en) 2012-10-10
WO2008099373A1 (en) 2008-08-21
US20100037806A1 (en) 2010-02-18
CA2677864A1 (en) 2008-08-21
IE20070094A1 (en) 2008-12-10
CN101657680A (en) 2010-02-24

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