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WO2013126021A1 - Permanent burning fireplace-type furnace - Google Patents

Permanent burning fireplace-type furnace Download PDF

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Publication number
WO2013126021A1
WO2013126021A1 PCT/SI2013/000010 SI2013000010W WO2013126021A1 WO 2013126021 A1 WO2013126021 A1 WO 2013126021A1 SI 2013000010 W SI2013000010 W SI 2013000010W WO 2013126021 A1 WO2013126021 A1 WO 2013126021A1
Authority
WO
WIPO (PCT)
Prior art keywords
reservoir
fuel
primary chamber
chamber
burning
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.)
Ceased
Application number
PCT/SI2013/000010
Other languages
French (fr)
Inventor
Marko UDOVČ
Anton SVET
Jure VRBANČIČ
Janez BENČINA
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.)
Inovatika d o o
Original Assignee
Inovatika d o o
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
Priority claimed from SI201200058A external-priority patent/SI24002A/en
Application filed by Inovatika d o o filed Critical Inovatika d o o
Priority to EP13718419.8A priority Critical patent/EP2817568A1/en
Priority claimed from SI201300039A external-priority patent/SI24294A/en
Publication of WO2013126021A1 publication Critical patent/WO2013126021A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • F24B1/18—Stoves with open fires, e.g. fireplaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B10/00—Combustion apparatus characterised by the combination of two or more combustion chambers
    • F23B10/02—Combustion apparatus characterised by the combination of two or more combustion chambers including separate secondary combustion chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B50/00—Combustion 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B50/00—Combustion 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
    • F23B50/02—Combustion 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 forming a column, stack or thick layer with the combustion zone at its bottom
    • F23B50/04—Combustion 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 forming a column, stack or thick layer with the combustion zone at its bottom the movement of combustion air and flue gases being substantially transverse to the movement of the fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B60/00—Combustion apparatus in which the fuel burns essentially without moving
    • F23B60/02—Combustion apparatus in which the fuel burns essentially without moving with combustion air supplied through a grate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
    • F23B90/00—Combustion methods not related to a particular type of apparatus
    • F23B90/04—Combustion methods not related to a particular type of apparatus including secondary combustion
    • F23B90/08—Combustion methods not related to a particular type of apparatus including secondary combustion in the presence of catalytic material
    • 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
    • F24B1/18—Stoves with open fires, e.g. fireplaces
    • F24B1/185—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion
    • 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
    • F24B1/18—Stoves with open fires, e.g. fireplaces
    • F24B1/185—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion
    • F24B1/189—Stoves with open fires, e.g. fireplaces with air-handling means, heat exchange means, or additional provisions for convection heating ; Controlling combustion characterised by air-handling means, i.e. of combustion-air, heated-air, or flue-gases, e.g. draught control dampers 
    • F24B1/19—Supplying combustion-air
    • 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
    • F24B13/00—Details solely applicable to stoves or ranges burning solid fuels 
    • F24B13/04—Arrangements for feeding solid fuel, e.g. hoppers 

Definitions

  • the subject of the present invention is a closed firewood-burning fireplace-type furnace, which in addition to the commonly-known operation as a standard fireplace, also provides long-term operation (up to 12 hours) at low nominal power (up to 3,5 kW).
  • the first mode of operation is that of the standard, commonly-known fireplace, where the wood fuel is loaded into a primary chamber. During the burning process, a larger amount of firewood bums simultaneously; therefore, the burning time is shorter and burning power greater.
  • the second mode of operation by means of corresponding regulation and the feeding of wood fuel from a reservoir provides an essentially longer burning time at a lower burning power. Construction and regulation of the furnace enables very clean combustion and consequently, low smoke emission and high energy efficiency, despite the fact that the burning power is lower. In both operational modes, the user may continuously observe burning wood logs through a glass.
  • the technical problem solved by the subject invention is the construction of a fireplace- type furnace, which enables long-term burning, preferably up to 12 hours, with constant low power up to 3,5 kW, very clean combustion and high energy efficiency.
  • a known solution that enables longer burning or has an integrated firewood reservoir is described in a patent application US 4335702.
  • This solution enables longer burning, due to the firewood reservoir, where wood logs are placed in a horizontal position. However, it does not allow burning under 3,5 kW, since too large an amount of firewood would be burning simultaneously. The user is also deprived from observing the flame, which also represents an aesthetic aspect of the furnace use.
  • the second known solution is patent application US 4355587, which also enables a longer burning time and includes a firewood reservoir. This solution is very unpractical, since it requires a lot of space. It differs from the previously described solution in that the wood logs are placed one above the other in an inclined tube, which can cause disturbances of wood log dosage into the combustion chamber. Another setback of this furnace is that the flame is not visible to the user.
  • the burning power is adjusted merely by the quantity of firewood fed into the burning process, where fresh air is normally fed into the combustion chamber from below, which means that the quality of combustion is thereby changing.
  • the subject invention solves the described technical problem by introducing a new construction of a permanent burning fireplace-type furnace, where the wood logs are placed in such manner that only a part of one wood log is present in the combustion zone (one of all loaded into the furnace), which enables controlled burning with low power and very clean combustion.
  • FIG 1 Longitudinal cross section of fireplace-type furnace
  • the permanent burning fireplace-type furnace consists of a reservoir, preheating channel, a primary and a secondary combustion chamber and a smoke channel.
  • the fuel reservoir 1 is a vertically disposed tube, mainly functioning as fuel 2 storage.
  • the preferred type of fuel 2 is firewood placed in the reservoir 1 in a vertical direction. In the lower section, the reservoir 1 continues into the primary chamber 6.
  • the reservoir 1 also prepares fuel 2 for combustion.
  • the fuel 2 is preheated and in the lower part of the reservoir , where the reservoir 1 is connected with the primary chamber 6, the fuel begins to gasify. Gasification of preheated and partially gasified fuel 2 is completed in the primary chamber 6. Generated gases inflame and combust in the secondary chamber 9.
  • the fuel 2 is fed into the primary chamber automatically, based on its own weight. In this manner, uniform and long-term burning is achieved, without intervention to the furnace. A part of the generated heat 10 from the primary chamber 6 and from the secondary chamber 9 maintains the preheating process and gasification of the fuel 2 in the reservoir 1.
  • Air 3 is fed only into the primary chamber 6. Therefore, burning of the fuel 2 in the reservoir 1 is prevented. In such a manner, the lack of oxygen required for burning in the reservoir 1 is achieved.
  • the air 3 is fed through the inlet 5, which is positioned on the point of connection of the reservoir 1 and primary chamber 6, guiding the air 3 directly towards the wood log.
  • the air 3 is preheated in the preheating channel 4, which is positioned beside the reservoir 1 and extends from one to two thirds of the reservoir 1 height, before being fed into the primary chamber 6.
  • the air 3 enters the preheating channel 4 from the outer bottom side, travels through the outer part up to the top of the preheating channel 4 and turns down through the inner part to the inlet 5, where it enters the primary chamber 6.
  • the ratio between the height of the primary chamber 6 and the diameter of the reservoir 1 is between 0,8 and 2,5.
  • the air 3 is preheated to ensure the highest possible temperature in the primary chamber 6 and the secondary chamber 9.
  • the entire periphery of the primary chamber 6 and of the secondary chamber 9 is surrounded with thermo accumulating elements, composed of two layers of different materials.
  • the inner layer 8 is made of ceramics, which is harder and wear resistant, and functions as a thermo accumulator.
  • the outer layer 7 is made of vermiculite and functions as a thermal insulator. In such a manner, a stable temperature in the primary chamber 6 and in the secondary chamber 9 is secured and thereby stable furnace operation as well.
  • a catalyst 11 is provided above the secondary chamber 9 at the entrance into the smoke channel 12, which takes care of the complete oxidation of non-combusted gases and diminishes the amount of harmful emissions into the environment, which is a priority for reducing CO emissions into the atmosphere.

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)
  • Chemical Kinetics & Catalysis (AREA)
  • Solid-Fuel Combustion (AREA)

Description

PERMANENT BURNING FIREPLACE-TYPE FURNACE
The subject of the present invention is a closed firewood-burning fireplace-type furnace, which in addition to the commonly-known operation as a standard fireplace, also provides long-term operation (up to 12 hours) at low nominal power (up to 3,5 kW).
The first mode of operation is that of the standard, commonly-known fireplace, where the wood fuel is loaded into a primary chamber. During the burning process, a larger amount of firewood bums simultaneously; therefore, the burning time is shorter and burning power greater. The second mode of operation by means of corresponding regulation and the feeding of wood fuel from a reservoir provides an essentially longer burning time at a lower burning power. Construction and regulation of the furnace enables very clean combustion and consequently, low smoke emission and high energy efficiency, despite the fact that the burning power is lower. In both operational modes, the user may continuously observe burning wood logs through a glass.
The technical problem solved by the subject invention is the construction of a fireplace- type furnace, which enables long-term burning, preferably up to 12 hours, with constant low power up to 3,5 kW, very clean combustion and high energy efficiency.
State of the art
There are no known solutions that would enable long-term burning with constant low burning power, clean combustion and high efficiency.
A known solution that enables longer burning or has an integrated firewood reservoir is described in a patent application US 4335702. This solution enables longer burning, due to the firewood reservoir, where wood logs are placed in a horizontal position. However, it does not allow burning under 3,5 kW, since too large an amount of firewood would be burning simultaneously. The user is also deprived from observing the flame, which also represents an aesthetic aspect of the furnace use. The second known solution is patent application US 4355587, which also enables a longer burning time and includes a firewood reservoir. This solution is very unpractical, since it requires a lot of space. It differs from the previously described solution in that the wood logs are placed one above the other in an inclined tube, which can cause disturbances of wood log dosage into the combustion chamber. Another setback of this furnace is that the flame is not visible to the user.
In most of the proposed solutions, the burning power is adjusted merely by the quantity of firewood fed into the burning process, where fresh air is normally fed into the combustion chamber from below, which means that the quality of combustion is thereby changing.
It is commonly believed that in order to achieve smoke emissions within the limits provided by standards, higher burning power is required. None of the proposed solutions enable a lower burning power, where despite lower burning power, low smoke emissions in the environment are achieved, as required by currently valid standards.
The subject invention solves the described technical problem by introducing a new construction of a permanent burning fireplace-type furnace, where the wood logs are placed in such manner that only a part of one wood log is present in the combustion zone (one of all loaded into the furnace), which enables controlled burning with low power and very clean combustion.
Description of the invention
The invention will be described in more detail in the following embodiment and presented in the attached drawing.
Figure 1: Longitudinal cross section of fireplace-type furnace
The permanent burning fireplace-type furnace according to subject invention consists of a reservoir, preheating channel, a primary and a secondary combustion chamber and a smoke channel.
The fuel reservoir 1 is a vertically disposed tube, mainly functioning as fuel 2 storage. The preferred type of fuel 2 is firewood placed in the reservoir 1 in a vertical direction. In the lower section, the reservoir 1 continues into the primary chamber 6.
Besides fuel 2 storage, the reservoir 1 also prepares fuel 2 for combustion. In the upper part of the reservoir 1 , the fuel 2 is preheated and in the lower part of the reservoir , where the reservoir 1 is connected with the primary chamber 6, the fuel begins to gasify. Gasification of preheated and partially gasified fuel 2 is completed in the primary chamber 6. Generated gases inflame and combust in the secondary chamber 9.
The fuel 2 is fed into the primary chamber automatically, based on its own weight. In this manner, uniform and long-term burning is achieved, without intervention to the furnace. A part of the generated heat 10 from the primary chamber 6 and from the secondary chamber 9 maintains the preheating process and gasification of the fuel 2 in the reservoir 1.
Air 3 is fed only into the primary chamber 6. Therefore, burning of the fuel 2 in the reservoir 1 is prevented. In such a manner, the lack of oxygen required for burning in the reservoir 1 is achieved. The air 3 is fed through the inlet 5, which is positioned on the point of connection of the reservoir 1 and primary chamber 6, guiding the air 3 directly towards the wood log.
The air 3 is preheated in the preheating channel 4, which is positioned beside the reservoir 1 and extends from one to two thirds of the reservoir 1 height, before being fed into the primary chamber 6.
The air 3 enters the preheating channel 4 from the outer bottom side, travels through the outer part up to the top of the preheating channel 4 and turns down through the inner part to the inlet 5, where it enters the primary chamber 6. The ratio between the height of the primary chamber 6 and the diameter of the reservoir 1 is between 0,8 and 2,5. The air 3 is preheated to ensure the highest possible temperature in the primary chamber 6 and the secondary chamber 9.
The entire periphery of the primary chamber 6 and of the secondary chamber 9 is surrounded with thermo accumulating elements, composed of two layers of different materials. The inner layer 8 is made of ceramics, which is harder and wear resistant, and functions as a thermo accumulator. The outer layer 7 is made of vermiculite and functions as a thermal insulator. In such a manner, a stable temperature in the primary chamber 6 and in the secondary chamber 9 is secured and thereby stable furnace operation as well.
Above the secondary chamber 9 at the entrance into the smoke channel 12, a catalyst 11 is provided, which takes care of the complete oxidation of non-combusted gases and diminishes the amount of harmful emissions into the environment, which is a priority for reducing CO emissions into the atmosphere.

Claims

Claims
1. A permanent burning fireplace-type furnace, characterized in that it consists of a fuel reservoir (1), a preheating channel (4) for preheating of intake air, a primary combustion chamber (6), a secondary combustion chamber (9) and a smoke channel (12).
2. The furnace according to claim 1 , characterized in that the fuel reservoir (1) is a vertically disposed tube, which in the lower part continues into the primary chamber (6), whereby the fuel (2) is preheated in the upper part of the reservoir (1) and in the lower part at the connection point with primary chamber (6), it begins to gasify.
3. The furnace according to claim 1 , characterized in that the preheating channel (4) is positioned beside the reservoir (1) and extends from one to two thirds of the reservoir (1) height, where the air (3) enters the preheating channel (4) from the outer bottom side, travels through the outer part up to the top of the preheating channel (4) and turns down through the inner part to the inlet (5), where it enters the primary chamber (6).
4. The furnace according to claim 3, characterized in that the ratio between the height of the primary chamber (6) and the diameter of the reservoir (1) is between 0,8 and 2,5.
5. The furnace according to claims 1 and 3, characterized in that air (3) is fed into the primary chamber (6) in such manner that oxygen required for burning is not present in the reservoir (1) and the air (3) is being fed through the inlet (5), positioned at the connection point of the reservoir (1) and primary chamber (6) thus guiding the air (3) directly towards the fuel, preferably a log of wood.
6. The furnace according to claims 1 and 3, characterized by that gasification of preheated and partially gasified fuel (2) is completed in the primary chamber (6), and that the generated gases are guided into the secondary chamber (9), where they inflame and combust, whereby a part of the generated heat (10) from the primary chamber (6) and the secondary chamber (9) is fed into the reservoir (1) to maintain the processes of preheating and gasification of fuel (2) in the reservoir (1).
PCT/SI2013/000010 2012-02-22 2013-02-22 Permanent burning fireplace-type furnace Ceased WO2013126021A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13718419.8A EP2817568A1 (en) 2012-02-22 2013-02-22 Permanent burning fireplace-type furnace

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
SIP-201200058 2012-02-22
SI201200058A SI24002A (en) 2012-02-22 2012-02-22 Permanent burning fireplace - type furnace
SIP-201300039 2013-02-22
SI201300039A SI24294A (en) 2013-02-22 2013-02-22 Permanent burning furnace

Publications (1)

Publication Number Publication Date
WO2013126021A1 true WO2013126021A1 (en) 2013-08-29

Family

ID=48182989

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SI2013/000010 Ceased WO2013126021A1 (en) 2012-02-22 2013-02-22 Permanent burning fireplace-type furnace

Country Status (1)

Country Link
WO (1) WO2013126021A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016205789A (en) * 2015-04-28 2016-12-08 寿正 金田 Stove
US10684040B2 (en) 2016-08-25 2020-06-16 Fire Chief Industries LLC Furnace
US10801738B2 (en) 2017-08-09 2020-10-13 Fire Chief Industries LLC Furnace
DE102020110114A1 (en) 2020-04-11 2021-10-14 Matthias Nickel Small combustion system and method for operating a small combustion system
JP7395166B1 (en) 2023-08-21 2023-12-11 隆士 ▲高▼松 combustion device
FR3155887A1 (en) 2023-11-29 2025-05-30 Michael DIDIER Stove
WO2025144050A1 (en) * 2023-12-24 2025-07-03 Rossum Martijn Arnold Wood stove equipped with a recirculation duct for combustion gases

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1981002619A1 (en) * 1980-03-07 1981-09-17 Lindstroem Ab Olle Furnace
WO1981002620A1 (en) * 1980-03-07 1981-09-17 Lindstroem Ab Olle Procedure for two stage combustion of wood,peat and related fuels
US4335702A (en) 1979-08-22 1982-06-22 Jarboe Joseph E Woodburning stove
US4355587A (en) 1979-10-25 1982-10-26 Lemon Wilfred T Self-feeding wood burning heating unit
US4483312A (en) * 1980-07-01 1984-11-20 Martenson Donald S Free standing stove

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4335702A (en) 1979-08-22 1982-06-22 Jarboe Joseph E Woodburning stove
US4355587A (en) 1979-10-25 1982-10-26 Lemon Wilfred T Self-feeding wood burning heating unit
WO1981002619A1 (en) * 1980-03-07 1981-09-17 Lindstroem Ab Olle Furnace
WO1981002620A1 (en) * 1980-03-07 1981-09-17 Lindstroem Ab Olle Procedure for two stage combustion of wood,peat and related fuels
US4483312A (en) * 1980-07-01 1984-11-20 Martenson Donald S Free standing stove

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2817568A1 *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016205789A (en) * 2015-04-28 2016-12-08 寿正 金田 Stove
US10684040B2 (en) 2016-08-25 2020-06-16 Fire Chief Industries LLC Furnace
US10801738B2 (en) 2017-08-09 2020-10-13 Fire Chief Industries LLC Furnace
DE102020110114A1 (en) 2020-04-11 2021-10-14 Matthias Nickel Small combustion system and method for operating a small combustion system
JP7395166B1 (en) 2023-08-21 2023-12-11 隆士 ▲高▼松 combustion device
JP2025029446A (en) * 2023-08-21 2025-03-06 隆士 ▲高▼松 Combustion equipment
FR3155887A1 (en) 2023-11-29 2025-05-30 Michael DIDIER Stove
EP4563891A1 (en) 2023-11-29 2025-06-04 Michael Didier Stove
WO2025144050A1 (en) * 2023-12-24 2025-07-03 Rossum Martijn Arnold Wood stove equipped with a recirculation duct for combustion gases

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