WO2002079693A1 - Burner for pellets - Google Patents
Burner for pellets Download PDFInfo
- Publication number
- WO2002079693A1 WO2002079693A1 PCT/FI2002/000262 FI0200262W WO02079693A1 WO 2002079693 A1 WO2002079693 A1 WO 2002079693A1 FI 0200262 W FI0200262 W FI 0200262W WO 02079693 A1 WO02079693 A1 WO 02079693A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- firebox
- burner
- grate
- fuel
- devices
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B1/00—Combustion apparatus using only lump fuel
- F23B1/16—Combustion apparatus using only lump fuel the combustion apparatus being modified according to the form of grate or other fuel support
Definitions
- the present invention relates to a burner intended for burning a solid fuel, particularly pellets, which is intended to be installed in a wall opening of a boiler, and the firebox of which is arranged to formed from at least
- the burner also includes means for feeding primary air, secondary air, and fuel into the firebox.
- a burner intended for burning a solid fuel, particularly pellets, is known from Finnish patent application 19992050 and WO application PCT/FI00/00811.
- the grate is formed from adjacent tubes, which are moved backwards and forwards axially. Primary air is introduced to the burning fuel from beneath and between the tubes, while secondary air is introduced to the firebox through the tubes.
- the heating of the grate structures essentially weakens its durability. Ash that collects in and adheres to the grate and other combustion waste can be difficult to remove, due to the complicated construction of existing burners.
- the fireboxes of burners according to the prior art have a construction that is, for example, tubular, with only one end open, or with the upper part fully open over its entire length. In boilers for small heating applications, for example, it is extremely difficult to fit burners that are open at only the end and to create a highly efficient heating effect, because such boilers, both those already installed and new ones, generally have a rather small size, so that their heat transfer surfaces are arranged in the boiler section in such a way that known types of burner construction do not give the best possible heating output .
- the air feed is generally handled a single blower. This makes it difficult to operate the burner economically, especially in summer, when it would be advantageous to adjust the output of the burner to suit the desired output .
- the present invention is intended to create a new type of burner for pellets, which is essentially simpler, more durable, more applicable, and more reliable in operation.
- the characteristic features of the burner for pellets according to the invention are stated in Claim 1.
- the new burner With the aid of the burner according to the invention, durability is substantially improved, by means of the new burner's manner of feeding air and its cleanability by means of the removable grate construction.
- the applicability of the burner to small heating boilers is also significantly improved, because the construction of its firebox also takes into account the geometrical characteristics and limitations of small boilers.
- the new type of air feed creates considerably more stable combustion conditions than in the burner solutions according to the pior art .
- Figure 1 shows the burner for pellets according to the invention, seen at an angle from above
- Figure 2 shows the burner for pellets according to the inven- tion, seen from straight in front
- Figure 3 shows a side view of the burner for pellets according to the invention
- Figure 4 shows a front view of the rear plate of the firebox of the burner for pellets according to the invention
- Figure 5 shows a cross-sectional side view of the burner for pellets according to the invention
- Figure 6 shows a cross-sectional top view of the burner for pellets according to the invention.
- FIGS 1 and 2 show the burner 10 intended for burning a solid fuel, particularly pellets, which is the subject of the inven- tion.
- the burner 10 for pellets is installed by pushing it by its front part 34 into the wall opening (not shown) of the boiler, so that the flange 15 remains outside the wall opening of the boiler.
- the walls of the firebox 35 of the burner 10 are formed, 5 according to the invention, from a casing construction, which is formed by the enclosed side walls 13.1, 13.2 of the firebox and an enclosed cover part 36 between them.
- the firebox 35 is bounded by a rear wall 19, which is at the opposite side to the front part 34.
- the essential element in the casing construction according to the invention is the perforations arranged in its inner side, which are preferably holes.
- the holes 14, 24, 25, which have a diameter of 3 - 15 mm, preferably 5 - 12 mm, are in the side walls 13.1, 15 13.2, in the upper cover part 36, and in the rear wall 19.
- a secondary-air blower 17 blows air, through a duct 44 ( Figure 5) arranged in the casing 31 behind the rear wall 19 of the firebox 35, into the said casing constructions, i.e. into the
- a primary blower 16 is also arranged in the rear part of the burner 10.
- a grate component which includes hollow grate tubes 11, which are set parallel to and at a distance to each other, for burning the fuel in a controlled manner on them, are located in the firebox 35 in the space bounded by the side walls 13.1, 13.2, and the rear wall 19. Further, the grate component includes a front
- a connection 21 is made in the rear wall 19 of the burner 10, to which the fuel-feed duct 41 ( Figure 5) is connected, inside of which the fuel is fed by means of the burner screw 20 onto the tubes 11 of the grate component of the firebox 35, according to a selected combustion program.
- the fuel is led to the duct 41 by a transfer pipe 18.
- the fuel feed stops and the fuel in the burner 10 is burned completely.
- the burner 10 automatically restarts.
- the fuel-feed system is protected from a fire starting backwards by means of a thermostatic extinguishing device, which is connected, for example, to the water mains network (not shown) .
- an opening 23 through which it is possible to arrange, for example, a flame guard for the firebox 35 using photocell monitoring, and an opening for example for a glow igniter 22, by means of which the fuel is ignited in a known manner.
- FIGS 3 and 5 show a side view of the burner 10 according to the invention.
- the side walls 13.1, 13.2 of the casing construc- tions of the firebox 35 are arranged in such a way that the lower part of the casing construction of the firebox 35 extends substantially further than the upper part into the boiler section.
- the cover part 36 which partly covers the firebox 35, extends over the insulation and material thickness of the wall construction 45 of the boiler section, so that the firebox 35 opens directly into the free upper part of the boiler section.
- Such a semi-open cover construction 36 permits the burner 10 to be advantageously used in conventional small boilers too, in which case the output produced in the firebox 35 is directed substantially better to the heat transfer surfaces of the boiler than in burners according to the prior art .
- the semi-open cover part 36 advantageously precisely that area of the firebox 35 in which the fuel feed is arranged to take place is covered and the secondary air is fed through it.
- the opening angle of the encased cover part 36 is preferably made with small boilers in mind, so that the secondary air feed is advantageously directed towards the boiler section.
- FIG 4 shows the rear wall 19 of the firebox 35. Connections 38 are made to the grate tubes 11 in the rear wall 19, so that the grate component 11, 12 can be easily detached for the cleaning of the ash collection space 39 ( Figure 5) and for changing the grate component 11, 12.
- the grate tubes 11 are attached to the front plate 12 and the air baffle 37.
- Separate blowers 16, 17 are arranged in the firebox 35 for feeding primary air and secondary air, the air amount of which is regulated by means of the air chokers (not shown) once during the installation of the burner 10.
- the secondary-air blower 17 blows air into the firebox 35 at the deepest cross-section of Figure 5 and through the duct construction 44 connected to the casing constructions 13.1, 13.2, 19, 36 shown in Figure 6, the duct being set in the burner at a location corresponding to that of the primary-air blower 16.
- the air blown by the primary-air blower 16 into the primary-air duct 46 travels to the lower part of the burner 10 and from there to the connections 38 ( Figure 4) through the grate tubes 11 to the front part 34 of the firebox 35 beneath the front plate 12 and from there under the tubes 11 to the ash-collection space 39 ( Figure 5) , so that the air enters the firebox 35 from between the grate tubes 11 and from the perforations 42 of the front plate 12.
- the ash-box door 33 can be pulled out, allowing the ash-collection space 39 to be easily cleaned.
- an operating alarm is given if there is some fault in the operation of the burner 10. Such an alarm triggers, for example, damping by the flame guard, or trips the motor protector.
- a maximum alarm is triggered, in turn, by some maximum level, such as the water temperature, being exceeded.
- the burner 10 according to the example, in which the firebox 35 length is 330 mm, has an output of about 100 kW.
- the output can, however, be advantageously adjusted over a range of 0 - 100 %, because the pellet fuel being burned and the glow ignition permit the burner 10 to be shut down temporarily.
- the burner 10 permits the selection of separate summer and winter running modes.
- the conveyor screw (not shown) begins to feed fuel through the transfer pipe 18 to the burner screw 20 of the fuel- feed duct 41, which transfers the fuel to the grate tube 11.
- the glow igniter 22 starts ignition and, after a set delay, the primary-aid blower 16 starts and the control of the resistance of the igniter 22 switches off.
- the secondary-air blower 17 starts.
- the photodiode begins to monitor the flame through an aperture 23 and, according to this, controls the fuel transfer screw (not shown) at intervals.
- the transfer screw and the burner screw 20 stop and the blowers 16, 17 shut down, each after their own delay.
- the glow igniter 22 is not used at all when starting the burner 10 as in summer running, instead the intention is to maintain continuous combustion in the burner 10, because the burner 10 is, in practice, stopped for only very short periods.
- the winter running mode can thus be used to save, for instance, the carbons of the igniter 22 and thus make it last longer.
- the fuel is fed using the transfer screw (not shown) through the transfer pipe 18 to the firebox 35 while the separate primary and secondary-air blowers 16, 17 are started at intervals.
- the running modes allow the burner 10 to be operated economically in both winter and summer conditions .
- the burner 10 according to the invention is simple, because it has only few moving parts and is reliable in operation and lasts for a long time, because the heated parts are cooled with the aid of the combustion-air feed according to the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Solid-Fuel Combustion (AREA)
- Glanulating (AREA)
- Air Supply (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE60209468T DE60209468D1 (en) | 2001-03-29 | 2002-03-27 | BURNER FOR PELLETS |
EP02706819A EP1384031B1 (en) | 2001-03-29 | 2002-03-27 | Burner for pellets |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20010653 | 2001-03-29 | ||
FI20010653A FI20010653A0 (en) | 2001-03-29 | 2001-03-29 | pellet burner |
FI20015036 | 2001-11-05 | ||
FI20015036A FI20015036A (en) | 2001-03-29 | 2001-11-05 | pellet burner |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002079693A1 true WO2002079693A1 (en) | 2002-10-10 |
Family
ID=26161155
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI2002/000262 WO2002079693A1 (en) | 2001-03-29 | 2002-03-27 | Burner for pellets |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1384031B1 (en) |
AT (1) | ATE319043T1 (en) |
DE (1) | DE60209468D1 (en) |
FI (1) | FI20015036A (en) |
WO (1) | WO2002079693A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004038968B3 (en) * | 2004-08-10 | 2006-05-11 | Manfred Manderbach | Automatic chip burner for central heating boiler has stepped combustion profile with primary, secondary and tertiary firing sectors |
WO2008057174A1 (en) * | 2006-11-10 | 2008-05-15 | Harman Stove Company | Burnpot for solid particulate stove |
WO2012027805A1 (en) * | 2009-09-01 | 2012-03-08 | Gauthier Thierry Constant Eddy Francois | Combustor module for pelletized solid mass |
AT508338B1 (en) * | 2010-07-29 | 2012-03-15 | Johann Perhofer | BURNER FOR SOLIDS |
EP2458274A1 (en) * | 2010-11-29 | 2012-05-30 | Linka Maskinfabrik A/S | Particulate solid fuel burner with special overfire air injection |
US8635996B2 (en) | 2006-10-09 | 2014-01-28 | Hni Technologies Inc. | Feed system for solid particulate fuel burning stove |
WO2017205884A2 (en) | 2016-06-02 | 2017-12-07 | DISTAND GmbH | Solid fuel burner |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102006059327A1 (en) | 2006-12-15 | 2008-06-26 | Robert Bosch Gmbh | Filter device for cleaning particle-containing combustion gases |
DE102007004221A1 (en) | 2007-01-27 | 2008-09-25 | Robert Bosch Gmbh | Apparatus and method for the thermal conversion of pellets or wood chips |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5070798A (en) * | 1990-08-31 | 1991-12-10 | Heatilator, Inc. | Pellet burner appliances and burners therefor |
US5269233A (en) * | 1992-10-06 | 1993-12-14 | Johnson Howard A | Stoker or particulate conveyor |
FR2711412A3 (en) * | 1993-10-18 | 1995-04-28 | Riser Georg | Solid fuel furnace |
WO2000075563A1 (en) * | 1999-06-04 | 2000-12-14 | Erik Pettersson | Burner for the burning of solid fuels |
WO2001022003A1 (en) * | 1999-09-24 | 2001-03-29 | Oy Ht Engineering Ltd | Burner for burning solid fuel, particularly pellets |
-
2001
- 2001-11-05 FI FI20015036A patent/FI20015036A/en not_active IP Right Cessation
-
2002
- 2002-03-27 WO PCT/FI2002/000262 patent/WO2002079693A1/en not_active Application Discontinuation
- 2002-03-27 DE DE60209468T patent/DE60209468D1/en not_active Expired - Fee Related
- 2002-03-27 EP EP02706819A patent/EP1384031B1/en not_active Expired - Lifetime
- 2002-03-27 AT AT02706819T patent/ATE319043T1/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5070798A (en) * | 1990-08-31 | 1991-12-10 | Heatilator, Inc. | Pellet burner appliances and burners therefor |
US5269233A (en) * | 1992-10-06 | 1993-12-14 | Johnson Howard A | Stoker or particulate conveyor |
FR2711412A3 (en) * | 1993-10-18 | 1995-04-28 | Riser Georg | Solid fuel furnace |
WO2000075563A1 (en) * | 1999-06-04 | 2000-12-14 | Erik Pettersson | Burner for the burning of solid fuels |
WO2001022003A1 (en) * | 1999-09-24 | 2001-03-29 | Oy Ht Engineering Ltd | Burner for burning solid fuel, particularly pellets |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004038968B3 (en) * | 2004-08-10 | 2006-05-11 | Manfred Manderbach | Automatic chip burner for central heating boiler has stepped combustion profile with primary, secondary and tertiary firing sectors |
US8635996B2 (en) | 2006-10-09 | 2014-01-28 | Hni Technologies Inc. | Feed system for solid particulate fuel burning stove |
WO2008057174A1 (en) * | 2006-11-10 | 2008-05-15 | Harman Stove Company | Burnpot for solid particulate stove |
WO2012027805A1 (en) * | 2009-09-01 | 2012-03-08 | Gauthier Thierry Constant Eddy Francois | Combustor module for pelletized solid mass |
AT508338B1 (en) * | 2010-07-29 | 2012-03-15 | Johann Perhofer | BURNER FOR SOLIDS |
US20130276681A1 (en) * | 2010-11-29 | 2013-10-24 | Linka Maskinfabrik A/S | Burner |
WO2012073157A1 (en) | 2010-11-29 | 2012-06-07 | Linka Maskinfabrik A/S | Burner |
EP2458274A1 (en) * | 2010-11-29 | 2012-05-30 | Linka Maskinfabrik A/S | Particulate solid fuel burner with special overfire air injection |
US10415821B2 (en) | 2010-11-29 | 2019-09-17 | Linka Maskinfabrik A/S | Burner |
WO2017205884A2 (en) | 2016-06-02 | 2017-12-07 | DISTAND GmbH | Solid fuel burner |
AT518707A1 (en) * | 2016-06-02 | 2017-12-15 | DISTAND GmbH | Solid fuel burner |
WO2017205884A3 (en) * | 2016-06-02 | 2018-01-25 | DISTAND GmbH | Solid fuel burner |
AT518707B1 (en) * | 2016-06-02 | 2018-02-15 | DISTAND GmbH | Solid fuel burner |
RU2731686C2 (en) * | 2016-06-02 | 2020-09-07 | ДИСТАНД ГмбХ | Solid fuel burner |
Also Published As
Publication number | Publication date |
---|---|
DE60209468D1 (en) | 2006-04-27 |
ATE319043T1 (en) | 2006-03-15 |
EP1384031B1 (en) | 2006-03-01 |
EP1384031A1 (en) | 2004-01-28 |
FI20015036A0 (en) | 2001-11-05 |
FI20015036A (en) | 2002-09-30 |
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