EP1347241B1 - Heating device with double fuel feed - Google Patents
Heating device with double fuel feed Download PDFInfo
- Publication number
- EP1347241B1 EP1347241B1 EP20030005789 EP03005789A EP1347241B1 EP 1347241 B1 EP1347241 B1 EP 1347241B1 EP 20030005789 EP20030005789 EP 20030005789 EP 03005789 A EP03005789 A EP 03005789A EP 1347241 B1 EP1347241 B1 EP 1347241B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- combustion chamber
- flow
- fuel
- air
- combustion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000446 fuel Substances 0.000 title claims description 29
- 238000010438 heat treatment Methods 0.000 title claims description 16
- 238000002485 combustion reaction Methods 0.000 claims description 65
- 239000003517 fume Substances 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 239000008188 pellet Substances 0.000 description 23
- 239000002023 wood Substances 0.000 description 13
- 230000002596 correlated effect Effects 0.000 description 3
- 230000000875 corresponding effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 208000003443 Unconsciousness Diseases 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
- F24B1/00—Stoves or ranges
- F24B1/02—Closed stoves
- F24B1/024—Closed stoves for pulverulent fuels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24B—DOMESTIC STOVES OR RANGES FOR SOLID FUELS; IMPLEMENTS FOR USE IN CONNECTION WITH STOVES OR RANGES
- F24B5/00—Combustion-air or flue-gas circulation in or around stoves or ranges
- F24B5/02—Combustion-air or flue-gas circulation in or around stoves or ranges in or around stoves
- F24B5/021—Combustion-air or flue-gas circulation in or around stoves or ranges in or around stoves combustion-air circulation
Description
- The present invention concerns a heating device such as a fireplace, a heater or similar, of the type suitable to be fed with at least two different types of fuel, such as for example pellets and wood, into which the comburent air is introduced into a combustion chamber only due to the natural drawing force.
- The device according to the invention comprises a system to regulate and divide the flow, in order to introduce air into the combustion chamber in quantities functional to the different combustion requirements of the different fuels and also to the different quantities of fuel loaded.
- The state of the art includes fireplaces or heaters which can function alternately and/or conjointly with two types of fuel of different types, for example with pellets, that is, chips of pressed wood residue, and with wood.
- This solution is particularly appreciated since it is possible to automate the feed with pellets by means of timed loading devices, which considerably increases the operating autonomy of the heating device and reduces the need for the user to intervene.
- Conventional heating devices comprise a combustion chamber where the means to contain the two fuels are arranged, normally consisting of braziers and/or supporting grills.
- Comburent air is introduced into the combustion chamber in order to actuate and maintain combustion.
- Conventional devices provide to use at least a fan, which can be driven and powered in regulatable fashion, and is actuated at least when the combustion uses pellets. In fact, pellets require a greater quantity of comburent air with respect to wood, and above all they require a variation in the delivery of air according to the quantity of pellets loaded, which is normally variable during combustion.
- Using a fan entails a first disadvantage in that, in the event of a sudden electricity failure, the comburent air needed for optimum combustion suddenly fails; this consequently causes an excess of unburnt particles to be emitted, which are dangerous for the environment. Moreover, the presence of the fan entails an increase in the costs and consumption of the device. Furthermore, the regulation of the fan may be imprecise and not correctly adapted to the loading dynamics of the pellets.
- EP-A-985.883 and EP-A-1.134.497 disclose heating appliances able to be fed with two different kind of fuels.
- US-A-4,387,700 discloses a stove having an automatic device for reduction of the flow to its combustion chamber.
- This document shows the features as defined in the preamble of claim 1.
- These documents do not disclose a heating device able to vary the supply of the air sent to the combustion chamber according to the kind of fuel to use.
- The present Applicant has devised and embodied this invention to overcome the shortcomings of the state of the art and to obtain further advantages.
- The present invention is set forth and characterized essentially in the main claim, while the dependent claims describe other characteristics of the invention.
- The purpose of the invention is to achieve a heating device such as a fireplace, a heater or similar, of the type with at least double fuel, such as for example pellets and wood, in which the comburent air is introduced into a combustion chamber due only to the natural drawing force and in regulatable fashion as the type of fuel used and the quantity of fuel loaded vary.
- In accordance with this purpose a heating device of the type indicated above comprises at least a combustion chamber in which means to support and contain a first and second fuel are arranged.
- According to a characteristic of the invention, the device comprises means to regulate and divide the introduction of comburent air, cooperating with at least an inlet aperture; the means allow the air to be introduced in regulatable quantities into the combustion chamber due to the natural drawing force alone.
- The regulation means are able to selectively send a variable and controlled quantity of comburent air towards the first fuel or towards the second fuel. The regulation means comprise means to divide the flow able to be selectively located in pre-determined positions in order to close the at least one inlet aperture for the comburent air into the combustion chamber in a variable, but calibrated and controllable fashion.
- In one embodiment of the invention, at least one position of the flow divisor means is adopted when there is a first fuel present, and at least a second position, different from the first, is adopted when there is a second fuel present.
- In a preferential embodiment, said at least one aperture comprises a first and second aperture made on a front wall of the frame of the heating device and communicates with the combustion chamber so as to selectively convey the air towards the first and/or second fuel. In this embodiment, the flow divisor means comprise a movable shutter able to be arranged in a plurality of pre-determined positions, variable with respect to said inlet apertures, to vary the delivery of comburent air introduced into the combustion chamber.
- The shutter is associated with actuation means, of a manual type such as a lever, a knob or similar, by which a user, actuating them from outside, can move the shutter to a pre-determined position.
- The heating device according to the invention also comprises means for the automatic loading of the first fuel into the containing means.
- The invention provides that a control unit receives input signals relating to the position of the divisor means and automatically conditions the drive of said automatic loading means according to the delivery of air introduced. In another embodiment, it is the quantity of fuel introduced which automatically conditions the position of the flow divisor means.
- According to another variant, the device comprises temperature sensor means, able to send relative signals to said control unit in order to drive the flow divisor means in relation to the temperature detected, for example, in the combustion chamber and/or in the fume discharge conduit.
- According to another variant, the device comprises means to analyze the fumes which send relative signals to the control unit to drive the flow divisor means in relation to the higher or lower content of unburnt substances in the discharge fumes.
- According to a further variant, the device comprises optical sensor means associated to the combustion chamber and oriented at least towards the flame. The optical sensor means are able to detect at least the presence or not of the flame, and one or more feature of the flame such as its height, its prevailing colour, its prevailing contour, the luminosity emitted or other, and to send some input signals to the control unit according to this detection. On the basis of the optical detection of some features of the flame, the control unit is arranged to drive the flow divisor means so as to vary the amount of air introduced in the combustion chamber; for example, if the optical means detect that the flame is smaller than a pre-set value, or its luminosity is lesser than a defined value, the control unit will drive the flow divisor means so as, for example, to increase the amount of the air to the combustion chamber and restore the correct conditions of combustion of the flame.
- With the device according to the invention it is possible to regulate - manually, from outside, and without using a regulatable delivery fan - the introduction of comburent air into a combustion chamber both according to the type of fuel used, and also the quantity of fuel present, and also the quantity of heat desired.
- Moreover, the regulation of the flow can be automated by means of a driven actuator and hence correlated both to the quantity of fuel automatically introduced and also to the temperature reached and also to the composition of the fumes and further to the features of the flame burning in the combustion chamber.
- Another advantage of the present invention is that, since the device functions with a natural drawing force of the comburent air, in the event of a sudden black-out, it guarantees that combustion is maintained, without causing dangerous emissions into the environment.
- These and other advantages of the present invention will be apparent from the following description of a preferential form of embodiment, given as a non-restrictive example, with reference to the attached drawings wherein:
- fig. 1 is a front view of the heating device according to the present invention;
- fig. 2 is a lateral section of the device in fig. 1;
- figs. 3 to 7 show the different operating positions which a flow regulation means of the device in fig. 1 can assume;
- fig. 8 is a front view of a flow regulation means from figs. 3-7.
- With reference to figs. 1 and 2, a heating device according to the invention is represented by a
heater 10 of the multiple feed type, fed bypellets 11 and wood (not shown in the drawings), and consists of a frame comprising a box-like structure 12, inside which acombustion chamber 14 is made. - In the upper zone of the box-
like structure 12 there is acontainer 16 for thepellets 11 connected to a programmable feed member consisting of a screw, not shown in the drawings, driven by a motor-reduction unit 20 and provided with atimer unit 21. By means of the screw thepellet 11 is taken from thecontainer 16 and discharged, through afeed conduit 18, into abrazier 15 arranged in thecombustion chamber 14. - The box-
like structure 12 comprises afront wall 19 in the lower zone of which there areapertures combustion chamber 14; the air is conveyed through theapertures pellets 11. - The size of the first 22 and the
second aperture 24 is designed so that an optimized flow of comburent air can be sent for the combustion respectively of the wood andpellets 11. To be more exact, thefirst aperture 22 has a size designed for an optimum combustion when functioning with wood, while thesecond aperture 24, which can be shuttered as will be described hereafter, is designed for an optimum combustion when functioning withpellets 11. - The
brazier 15 has through holes 15b on the bottom to allow the air to pass and the ash to be removed. The comburent air, both for combustion ofpellets 11 and for combustion of wood, is introduced thanks to the natural drawing force, due to the depression created inside thecombustion chamber 14 after the combustion fumes have been discharged through anoutlet conduit 17. - The
heater 10 also comprises means to divide the flow of comburent air (figs. 3 to 8), consisting of ashutter 30 sliding in cooperation with the twoapertures shutter 30 is associated with adrive lever 26 inserted in afront grill 29 and connected to theshutter 30 by anarm 27. In theshutter 30 there is also afirst window 31a and asecond window 31b, of a size mating respectively with thefirst aperture 22 and thesecond aperture 24. Theshutter 30 can slide in front of or behind theinlet apertures apertures - The
lever 26 can be selectively moved to a plurality of pre-determined positions A, B, C, D and E, which each correspond to a different closed condition of theapertures drive lever 26 can be detected by a sensor 41 associated with aregulation device 40 which, according to the delivery of air introduced, conditions the drive of thetimer unit 21 of the motor-reduction unit 20, to automatically vary the speed and loading times of thepellet 11 into thecombustion chamber 14, according to the quantity of air introduced. - The heating device according to the invention functions as follows. In the examples shown here the
shutter 30 slides in front of theinlet apertures shutter 30 slides behind saidapertures - When the
lever 26 is in a first position A, theshutter 30 is completely displaced to the right (fig. 3) and completely closes thesecond aperture 24, while thefirst window 31a coincides with thefirst aperture 22, to allow the comburent air to be introduced into thecombustion chamber 14. This position is adopted when thedevice 10 is functioning mainly with wood, and the air introduced only through theaperture 22 corresponds to the quantity needed to obtain optimum combustion. - By moving the
regulation lever 26 completely to the left to position B, as shown in fig. 4, theshutter 30 closes thefirst aperture 22, while thesecond window 31b is arranged completely in correspondence with thesecond aperture 24, so as to obtain a maximum flow of comburent air towards thebrazier 15 containing thepellets 11. This position, which determines the introduction of air only through thesecond aperture 24, is actuated when thedevice 10 is functioning mainly withpellets 11. - The sensor 41 detects the position B of the
lever 26, corresponding to the maximum flow of comburent air, and conditions the speed of the screw to load thepellets 11 into thebrazier 15 in a quantity correlated and proportional to the flow of air, in order to optimize the combustion conditions. - On the contrary, by positioning the regulation lever in the intermediate positions, respectively C and D, the
shutter 30 closes about 1/3 (fig. 5) and 2/3 (fig. 6) of thesecond aperture 24 to obtain lesser quantities of comburent air introduced to thebrazier 15. - In correspondence with the positions C and D, the sensor 41 also detects the position of the
lever 26 and, by means of thedevice 40, sends a command signal to regulate the speed of the screw in order to load a quantity ofpellets 11 which is correlated and proportional to the flow of air introduced into thecombustion chamber 14. - On the contrary, by moving the
shutter 30 into the position E, both theaperture 22 and theaperture 24 are partly opened. In this position E theheater 10 is regulated for the simultaneous combustion of wood andpellets 11. - The
heating device 10 comprises, in an upper zone of thecombustion chamber 14, a plurality of holes 51 to introduce a flow of air, which achieves the so-called secondary combustion of the substances which have not been burnt during primary combustion. According to a variant of the invention, adoor 50 is mechanically connected, by means of an articulated arm (not shown here), directly to thelever 26, to selectively close said holes 51. - When the
regulation lever 26 is in position A, or E, corresponding to the introduction of air for the combustion of wood, thedoor 50 is opened to introduce air to the upper part of thecombustion chamber 14 and to achieve secondary combustion. On the contrary, when thedrive lever 26 is in any of positions B, C or D, wherein combustion is regulated for burningpellets 11, thedoor 50 is closed so as to prevent the circulation of air in the upper part of thecombustion chamber 14 and to concentrate said circulation on the level of thebrazier 15, to optimize the post-combustion of thepellets 11. - In a variant not shown here, for example, the device may comprise at least a temperature sensor and/or a sensor to analyse the composition of the fumes and/or an optical sensor to detect at least a feature of the flame burning in the combustion chamber. The above sensors are connected to a processing unit which is able, from the signals sent by the sensors, to obtain information about the characteristic of the combustion and to drive automatically the movement of the
shutter 30 to regulate accordingly the amount of the air introduced in thecombustion chamber 14.
Claims (13)
- - Heating device such as a fireplace, a heater (10) or similar, able to be fed alternatively with at least two fuels of different type, comprising at least a combustion chamber (14), in which means to contain at least a first and a second fuel are arranged, at least an inlet aperture (22, 24) being present able to convey comburent air into said combustion chamber (14), the introduction of said comburent air into said combustion chamber (14) occurring only due to the natural drawing force, characterized in that regulation means (30, 31a, 31b) to regulate a flow of comburent air into said combustion chamber (14) are able to cooperate with said at least one inlet aperture (22, 24) in order to selectively send a regulatable quantity of comburent air towards said first or towards said second fuel.
- - Device as in claim 1, characterized in that said regulation means comprise flow divisor means (30) able to be selectively arranged in a plurality of positions with respect to said at least one inlet aperture (22, 24), positions corresponding to a pre-defined delivery of comburent air introduced into said combustion chamber (14).
- - Device as in claim 1 or 2, characterized in that said at least one inlet aperture comprises at least a first aperture (22) with an optimized size for the combustion of a first fuel and at least a second aperture (24) with an optimized size for the combustion of said second fuel.
- - Device as in claim 2 or 3, characterized in that said flow divisor means comprise a shutter (30) able to be displaced by means of actuation means (26) in order to close in variable fashion said at least one inlet aperture (22, 24) for the introduction of comburent air.
- - Device as in claim 4, characterized in that said actuation means comprise a manual drive lever (26).
- - Device as in claim 4, characterized in that said actuation means comprise a driven actuator.
- - Device as in any claim from 2 to 6 inclusive, comprising automatic loading means (18, 20, 21) for one (11) of the two fuels, characterized in that it comprises a control unit (40) associated with sensor means (41) to detect the position of said divisor means (30) in order to condition the drive of said automatic loading means (18, 20, 21) according to the quantity of air introduced into said combustion chamber (14).
- - Device as in any claim from 2 to 6 inclusive, characterized in that it comprises a control unit (40) to detect the quantity of fuel introduced in the combustion chamber in order to condition automatically the position of said flow divisor means (30) according to said quantity.
- - Device as in any claim from 2 to 8 inclusive, characterized in that it comprises temperature sensor means able to condition the position of said flow divisor means (30) according to the temperature reached in at least one zone of the heating device.
- - Device as in any claim from 2 to 9 inclusive, characterized in that it comprises analysing means to analyze the discharge fumes able to condition the position of said flow divisor means (30) according to the composition of said fumes.
- - Device as in any claim from 2 to 10 inclusive, characterized in that it comprises optical sensor means to detect at least a feature of a flame burning in said combustion chamber (14) and able to condition the position of said flow divisor means (30) according to the feature of the flame.
- - Device as in claim 11, characterized in that said feature of the flame is at least one between the presence or not of the flame, its height, its prevailing colour, its prevailing contour or the luminosity emitted.
- - Device as in any claim from 2 to 12 inclusive, comprising means (50, 51) for the selective introduction of secondary comburent air into an upper part of the combustion chamber (14), characterized in that said means (50) are able to be arranged in a position wherein the introduction of the secondary air is closed when said flow divisor means (30) are put in a determinate position.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITUD20020064 | 2002-03-18 | ||
ITUD20020064 ITUD20020064A1 (en) | 2002-03-18 | 2002-03-18 | HEATING DEVICE WITH DOUBLE FUEL SUPPLY |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1347241A1 EP1347241A1 (en) | 2003-09-24 |
EP1347241B1 true EP1347241B1 (en) | 2007-01-10 |
Family
ID=27773206
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20030005789 Expired - Lifetime EP1347241B1 (en) | 2002-03-18 | 2003-03-14 | Heating device with double fuel feed |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1347241B1 (en) |
DE (1) | DE60311026T2 (en) |
ES (1) | ES2280638T3 (en) |
IT (1) | ITUD20020064A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
HUP0600848A2 (en) * | 2006-11-16 | 2010-04-28 | Fireplace Kft | Fireplace with gravitational feeding for pellet |
AT507099B1 (en) | 2008-09-16 | 2010-02-15 | Lohberger Heiz & Kochgeraete T | DEVICE AND METHOD FOR REGULATING OR BZW. CONTROL OF THE SUPPLY AND / OR EXHAUST AIR INTO BZW. FROM A COMBUSTION CHAMBER OF A HEATING DEVICE |
EP2640541A1 (en) * | 2010-11-19 | 2013-09-25 | Carrier Corporation | Method of and system for brazing aluminum workpieces using a flame and monitoring of the flame color |
AT511145B1 (en) * | 2011-03-14 | 2014-03-15 | Riener Karl Stefan | METHOD FOR REGULATING A HEATING DEVICE |
IT201800006598A1 (en) * | 2018-06-22 | 2019-12-22 | BIOMASS POWERED HEATING EQUIPMENT WITH A DOUBLE COMBUSTION CHAMBER WITH COMBUSTION AIR CONVEYOR SYSTEM |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4387700A (en) * | 1981-05-21 | 1983-06-14 | Eggleston Merritt J | Woodstove having exhaust flow compensation and a method for providing same |
EP0985883B1 (en) * | 1998-08-19 | 2006-05-24 | Eurofiamma S.R.L. | Heating means |
IT1314393B1 (en) * | 2000-03-14 | 2002-12-13 | Marana Forni Di Marana Ferdina | HIGH THERMAL PERFORMANCE OVEN THAT CAN BE SUPPLIED WITH COMPRESSED WOOD OR PELLET SHAVINGS. |
-
2002
- 2002-03-18 IT ITUD20020064 patent/ITUD20020064A1/en unknown
-
2003
- 2003-03-14 DE DE2003611026 patent/DE60311026T2/en not_active Expired - Fee Related
- 2003-03-14 EP EP20030005789 patent/EP1347241B1/en not_active Expired - Lifetime
- 2003-03-14 ES ES03005789T patent/ES2280638T3/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE60311026T2 (en) | 2007-11-08 |
DE60311026D1 (en) | 2007-02-22 |
EP1347241A1 (en) | 2003-09-24 |
ITUD20020064A1 (en) | 2003-09-18 |
ES2280638T3 (en) | 2007-09-16 |
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