WO2015118437A2 - Stove assembly with l-shaped combustion chamber in an enclosing body - Google Patents

Stove assembly with l-shaped combustion chamber in an enclosing body Download PDF

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Publication number
WO2015118437A2
WO2015118437A2 PCT/IB2015/050773 IB2015050773W WO2015118437A2 WO 2015118437 A2 WO2015118437 A2 WO 2015118437A2 IB 2015050773 W IB2015050773 W IB 2015050773W WO 2015118437 A2 WO2015118437 A2 WO 2015118437A2
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WO
WIPO (PCT)
Prior art keywords
combustion chamber
air
shaped combustion
enclosing body
vertical portion
Prior art date
Application number
PCT/IB2015/050773
Other languages
French (fr)
Other versions
WO2015118437A3 (en
Inventor
Ankit Mathur
Mohammed Shoeb KAZI
Original Assignee
Ankit Mathur
Kazi Mohammed Shoeb
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ankit Mathur, Kazi Mohammed Shoeb filed Critical Ankit Mathur
Publication of WO2015118437A2 publication Critical patent/WO2015118437A2/en
Publication of WO2015118437A3 publication Critical patent/WO2015118437A3/en

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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
    • F24B1/181—Free-standing fireplaces, e.g. for mobile homes ; Fireplaces convertible into stoves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/40—Portable or mobile incinerators
    • F23G5/42—Portable or mobile incinerators of the basket type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
    • F23G7/10—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of field or garden waste or biomasses
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2209/00—Specific waste
    • F23G2209/26—Biowaste

Definitions

  • the present invention relates to the field of stoves.
  • the present invention relates to a combustion stove assembly burning biomass or other fuel.
  • the present invention in its various embodiments provides a stove and methods of working and assembly which, with its structure and arrangement, addresses limitations of the currently used stoves by providing more efficient heating, reduction in radiation losses, conservation of fuel, less smoke and less harmful emissions.
  • the object of the present invention is to provide a stove providing the following advantages: a) efficient heating leading to fuel conservation,
  • the present invention in a broad aspect, provides a stove designed to provide efficient heating / cooking with less smoke and harmful emissions.
  • the invention is,
  • a stove assembly comprising:
  • a hollow L-shaped combustion chamber comprising,
  • enclosing body which encloses the L-shaped combustion chamber, said enclosing body comprising,
  • a cut out portion towards the bottom of the enclosing body said cut out portion designed to enable the enclosing body to fit on to the horizontal portion of the combustion chamber such that leakage of air is restricted at the intersection of the enclosing body and horizontal portion of the combustion chamber;
  • the air in the tapering gap gets heated and rises upwards due to the heat from the external wall of the combustion chamber thereby creating a convective air current upwards; and wherein the vertical portion of the combustion chamber has secondary air inlets towards its upper portion which direct rising air from the convective air current at the top of the tapering gap into the vertical portion of the combustion chamber for better combustion due to mixing of heated air from the convective current with combustible volatile gases in the vertical portion of the combustion chamber.
  • the stove assembly disclosed herein can be further installed within a variety of containments (i.e., outside body, traditional stoves, frames / stands and the like).
  • Fig. 1 is a schematic drawing of an embodiment of an L-shaped combustion chamber
  • Fig. 2 is a schematic drawing of an embodiment of an enclosing body
  • Fig. 3 is a schematic drawing of an embodiment of a base for the stove assembly
  • Fig. 4 is a schematic drawing of an embodiment of a stove assembly
  • Fig. 5 is an exploded view drawing of an embodiment of a stove assembly
  • Fig. 6 is a cut-away view drawing of an embodiment of a stove assembly illustrating the air flows
  • Fig. 7 is a schematic drawing illustrating how a sheet can be designed and cut such that it can be rolled and assembled into an enclosing body with a cut out portion to match and fit the horizontal portion of the combustion chamber;
  • Fig. 8 is a schematic drawing illustrating embossed secondary air inlets in an L-shaped combustion chamber
  • Fig. 9 is a schematic drawing of a fuel support.
  • Fig. 10 is a schematic drawing showing the fuel support inserted inside an L-shaped combustion chamber.
  • the present invention in a broad aspect, provides a stove designed to provide efficient heating / cooking with less smoke and harmful emissions.
  • the invention is,
  • a stove assembly comprising:
  • a hollow L-shaped combustion chamber 1 comprising,
  • a vertical portion 2 for burning fuel with an opening at the top 10 through which heat and exhaust fumes can exit, and
  • enclosing body 4 which encloses the L-shaped combustion chamber 1, said enclosing body 4 comprising,
  • the vertical portion 2 of the L-shaped combustion chamber 1 has secondary air inlets 7 towards its upper portion which direct rising air from the convective air current at the top of the tapering gap 12 into the vertical portion 2 of the L-shaped combustion chamber for better combustion due to mixing of heated air from the convective current with combustible volatile gases in the vertical portion 2 of the L-shaped combustion chamber.
  • An additional embodiment includes a base 5, elevated from the floor, on which the L-shaped combustion chamber 1 and the enclosing body 4 are placed, said base having a plurality of holes 6 towards the periphery of the base which serve as inlets for allowing air to flow into the tapering gap.
  • the enclosing body 4 of the preferred embodiment has a plurality of holes in its lower region which serve as inlets for allowing air to flow into the tapering gap.
  • secondary air inlets towards the upper portion of the vertical portion of the combustion chamber are embossed such that said embossed secondary air inlets 13 direct rising air from the convective air current at the top of the tapering gap 12 downwards into the vertical portion 2 of the L-shaped combustion chamber.
  • the stove assembly is incorporated in existing traditional mud stoves.
  • the stove assembly is incorporated in any outer body of any make (cylindrical, oval, square, rectangular etc.) and material (metal, mud or other heat withstanding material).
  • the enclosing body of the stove assembly has an angle of inclination (i.e., angle formed between the X-axis and the outer surface of the enclosing body) of 95 to 110 degrees.
  • the stove assembly is used in combination with a stand on which the vessel or items to be heated can be placed.
  • the invention is a method of assembling a stove assembly by placing a hollow enclosing body 4 on a hollow L-shaped combustion chamber 1 wherein:
  • said hollow L-shaped combustion chamber 1 comprises,
  • a vertical portion 2 for burning fuel with an opening at the top 10 through which heat and exhaust fumes can exit, and
  • said enclosing body 4 comprises,
  • a cut out portion 11 towards the bottom of the enclosing body 4 said cut out portion designed to enable the enclosing body to fit on to the horizontal portion 3 of the L- shaped combustion chamber 1 such that leakage of air is restricted at the intersection of the enclosing body and horizontal portion of the L-shaped combustion chamber;
  • the vertical portion 2 of the L-shaped combustion chamber 1 has secondary air inlets towards its upper portion which direct rising air from the convective air current at the top of the tapering gap 12 into the vertical portion of the L-shaped combustion chamber for better combustion due to mixing of heated air from the convective current with combustible volatile gases in the vertical portion of the L-shaped combustion chamber.
  • the method of assembling the stove assembly further includes forming said hollow enclosing body 4 by rolling a sheet 8 having said cut out portion 11.
  • the invention is a method of heating, using a stove assembly having a hollow L-shaped combustion chamber 1 surrounded by a tapered hollow enclosing body 4, said method of heating comprising the steps of:
  • the present invention is directed towards solving the problem of harmful emissions emitted from inefficient traditional stoves as well as open fires.
  • the invention relates to providing air (oxygen) in excess of the stoichiometric ratio required for the complete combustion of the solid biomass fuel.
  • the present invention also relates to the method of working of a stove assembly for combustion of fuel.
  • the present invention also relates to the method of assembly of a stove assembly for heating.
  • the invention is a stove assembly comprising a hollow L-shaped combustion chamber 1 on which a hollow enclosing body 4 is closely fitted.
  • the frontal opening in the horizontal portion of the L-shaped combustion chamber serves as the entry for fuel as well as primary air.
  • the L-shaped combustion chamber and enclosing body are placed on a base 5 which is elevated from the floor.
  • the base 5 has a plurality of holes 6 towards its periphery.
  • the air in the tapering gap 12 between the combustion chamber 1 and the enclosing body 4 gets heated up when fuel is burnt in the combustion chamber. This hot air rises up and gets into the vertical portion of the combustion chamber via the secondary air inlets.
  • the air which enters the combustion chamber creates an empty space in the tapering gap. Since every system has a tendency to achieve equilibrium, cold air from the surrounding enters the tapering gap to fill this void space. This cold air in turn comes in thermal communication with the heated external wall of the combustion chamber, gets heated and rises up. Thus a convective current is formed due to change in the density of air with the change in temperature.
  • Fig. 6 illustrates secondary air entering the tapering gap 12 through the holes 6 in the base.
  • Fig. 6 also illustrates the heated air in the tapering gap rising with the convection current and entering the vertical portion 2 of the combustion chamber thereby ensuring better combustion.
  • the tapering gap created by the enclosing body provides a differential area for air exit. This reduction in area towards the exit increases the velocity of air which in turn causes better mixing with the combustible volatile gases. These volatile gases which would have otherwise escaped into the environment get burnt due to the secondary air thereby ensuring better heating and reduction in fumes and harmful emissions.
  • the enclosing body having a tapered structure directs air with increased velocity into the combustion chamber causing better combustion & heating and reduction in fumes and harmful emissions.
  • the wall of the combustion chamber separates the secondary air inside the tapering gap from the primary air coming inside the combustion chamber through its frontal opening in the horizontal portion.
  • the secondary air coming inside the combustion chamber through the secondary inlet apertures can be directed downwards towards the burning fuel (point of combustion) causing a better combustion of the fuel. This can be achieved by embossing 13 the secondary inlet apertures (holes protruding above the datum like in the case of vegetable shredder/grate) and pointing them downwards so as to direct air towards the burning fuel.
  • the enclosing body has a cut out portion 11 which is designed to match and fit on to the horizontal portion of the combustion chamber such that leakage of air from the tapered gap is restricted.
  • Fig. 7 illustrates how a sheet 8 can be designed and cut with a cut out portion and then rolled and formed into the enclosing body.
  • the gap between the enclosing body cut out portion and horizontal portion of the combustion chamber is sought to be restricted but not eliminated. Having a slight gap helps avoid stress to the stove assembly even when the different parts of the assembly expand & contract at different rates due to constant heating & cooling.
  • the enclosing body cuts down the radiation losses emitting from the combustion chamber.
  • the enclosing body acts as a barrier to heat transfer so that most of the heat gets retained in the combustion chamber itself or in the tapering gap.
  • the present invention can, in an additional embodiment, be incorporated in existing traditional mud stoves or any other outer body of any make and material provided the stove assembly is at an elevation from the ground so as to allow the entry of air into the tapering gap.
  • the present invention can be used in combination with a stand on which the vessel or items to be heated can be placed. The stove assembly should be placed in the center and below the stand.
  • the air inlets can be on the side of the enclosing body towards the bottom. This way the assembly need not be placed on an elevated base.
  • a fuel support 14 i.e., grate
  • a fuel support 14 preferably made of sheet metal with ventilation holes, wire rods, wire mesh or the like can also be used in the present invention to place the fuel and then insert it inside the horizontal portion of the combustion chamber 1.
  • the fuel support ensures that air is provided to the lower surface of the fuel thereby ensuring better combustion of fuel.
  • the fuel support also separates ash and charcoal from the fuel which would otherwise get accumulated on the fuel itself and would have minimized the air supply to the fuel.
  • the fuel support can be of any length and size depending on the size of the horizontal portion 3 of the combustion chamber.
  • the combustion chamber may be angled at 80 degrees or 100 degrees etc and provide approximately the same functionality, thereby falling within the range of equivalency of the present invention.
  • the enclosing body also need not be only in the shape of a lampshade with straight sides as shown in the illustrative embodiment diagrams. It can be shaped in any manner as long as it has a tapered part.
  • tapering as applied to the enclosing body, means an overall vertical narrowing, from bottom to top, of the enclosing body whether gradual, abrupt, stepped, straight or curved.
  • the present invention has the following uses:
  • process steps, method steps, protocols, or the like may be described in a sequential order, such processes, methods, and protocol may be configured to work in alternate orders.
  • any sequence or order of steps that may be described does not necessarily indicate a requirement that the steps be performed in that order.
  • the steps of processes described herein may be performed in any order practical. Further, some steps may be performed simultaneously, in parallel, or concurrently.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Solid-Fuel Combustion (AREA)

Abstract

A stove assembly comprising a) an L-shaped combustion chamber comprising a vertical portion for burning fuel and a horizontal portion with an opening for entry of fuel and air, b) a hollow enclosing body which encloses the L-shaped combustion chamber, said enclosing body comprising, i) a tapered portion, and ii) a cut out portion towards the bottom of the enclosing body, said cut out portion designed to enable the enclosing body to fit on to the horizontal portion of the combustion chamber such that leakage of air is restricted at the intersection of the enclosing body and horizontal portion of the combustion chamber. The stove assembly can be further installed within a variety of containments (e.g., outside body, traditional stoves, frames / stands and the like). Methods for assembling and using the stove assembly are also disclosed.

Description

STOVE ASSEMBLY WITH L-SHAPED COMBUSTION CHAMBER IN AN
ENCLOSING BODY
FIELD OF THE INVENTION;
The present invention relates to the field of stoves.
More particularly, the present invention relates to a combustion stove assembly burning biomass or other fuel.
BACKGROUND;
A lack of access to modern fuel forces rural consumers to use biomass in poorly designed mud stoves and other free-standing stoves which emit dangerous and uncomfortable smoke. Also due to poor design and air flow the fuel is not properly burnt leading to less heating, harmful emissions and wastage of fuel.
The present invention in its various embodiments provides a stove and methods of working and assembly which, with its structure and arrangement, addresses limitations of the currently used stoves by providing more efficient heating, reduction in radiation losses, conservation of fuel, less smoke and less harmful emissions.
OBJECTS OF THE INVENTION;
The object of the present invention is to provide a stove providing the following advantages: a) efficient heating leading to fuel conservation,
b) less smoke and harmful emissions leading to better health for users,
c) elimination of the need to provide oxygen containing air through manual (e.g., blowing) or mechanized means, and
d) convenient front (fuel) loading hearth.
SUMMARY OF THE INVENTION;
The present invention, in a broad aspect, provides a stove designed to provide efficient heating / cooking with less smoke and harmful emissions. In a preferred embodiment the invention is,
A stove assembly comprising:
a) a hollow L-shaped combustion chamber comprising,
i) a vertical portion for burning fuel, with an opening at the top through which heat and exhaust fumes can exit, and
ii) a horizontal portion, with an opening for entry of fuel and air; and
b) a hollow enclosing body which encloses the L-shaped combustion chamber, said enclosing body comprising,
i) a tapered portion, surrounding the vertical portion of the combustion chamber thereby creating a vertically tapering gap between the vertical portion of the combustion chamber and the tapered portion of the enclosing body; and
ii) a cut out portion towards the bottom of the enclosing body, said cut out portion designed to enable the enclosing body to fit on to the horizontal portion of the combustion chamber such that leakage of air is restricted at the intersection of the enclosing body and horizontal portion of the combustion chamber;
and wherein the air in the tapering gap gets heated and rises upwards due to the heat from the external wall of the combustion chamber thereby creating a convective air current upwards; and wherein the vertical portion of the combustion chamber has secondary air inlets towards its upper portion which direct rising air from the convective air current at the top of the tapering gap into the vertical portion of the combustion chamber for better combustion due to mixing of heated air from the convective current with combustible volatile gases in the vertical portion of the combustion chamber.
The stove assembly disclosed herein can be further installed within a variety of containments (i.e., outside body, traditional stoves, frames / stands and the like).
BRIEF DESCRIPTION OF THE DRAWINGS;
Fig. 1 is a schematic drawing of an embodiment of an L-shaped combustion chamber;
Fig. 2 is a schematic drawing of an embodiment of an enclosing body;
Fig. 3 is a schematic drawing of an embodiment of a base for the stove assembly;
Fig. 4 is a schematic drawing of an embodiment of a stove assembly;
Fig. 5 is an exploded view drawing of an embodiment of a stove assembly; Fig. 6 is a cut-away view drawing of an embodiment of a stove assembly illustrating the air flows;
Fig. 7 is a schematic drawing illustrating how a sheet can be designed and cut such that it can be rolled and assembled into an enclosing body with a cut out portion to match and fit the horizontal portion of the combustion chamber;
Fig. 8 is a schematic drawing illustrating embossed secondary air inlets in an L-shaped combustion chamber;
Fig. 9 is a schematic drawing of a fuel support; and
Fig. 10 is a schematic drawing showing the fuel support inserted inside an L-shaped combustion chamber.
DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION WITH REFERENCE TO THE ENCLOSED EXEMPLARY DRAWINGS;
The present invention, in a broad aspect, provides a stove designed to provide efficient heating / cooking with less smoke and harmful emissions.
In a preferred embodiment the invention is,
A stove assembly comprising:
a) a hollow L-shaped combustion chamber 1 comprising,
i) a vertical portion 2 for burning fuel, with an opening at the top 10 through which heat and exhaust fumes can exit, and
ii) a horizontal portion 3, with an opening 9 for entry of fuel and air; and
b) a hollow enclosing body 4 which encloses the L-shaped combustion chamber 1, said enclosing body 4 comprising,
i) a tapered portion, surrounding the vertical portion of the L-shaped combustion chamber
1 thereby creating a vertically tapering gap 12 between the vertical portion 2 of the L- shaped combustion chamber and the tapered portion of the enclosing body 4; and ii) a cut out portion 11 towards the bottom of the enclosing body 4, said cut out portion designed to enable the enclosing body to fit on to the horizontal portion 3 of the L- shaped combustion chamber 1 such that leakage of air is restricted at the intersection of the enclosing body 4 and horizontal portion 3 of the L-shaped combustion chamber; and wherein the air in the tapering gap 12 gets heated and rises upwards due to the heat from the external wall of the L-shaped combustion chamber 1 thereby creating a convective air current upwards;
and wherein the vertical portion 2 of the L-shaped combustion chamber 1 has secondary air inlets 7 towards its upper portion which direct rising air from the convective air current at the top of the tapering gap 12 into the vertical portion 2 of the L-shaped combustion chamber for better combustion due to mixing of heated air from the convective current with combustible volatile gases in the vertical portion 2 of the L-shaped combustion chamber.
An additional embodiment includes a base 5, elevated from the floor, on which the L-shaped combustion chamber 1 and the enclosing body 4 are placed, said base having a plurality of holes 6 towards the periphery of the base which serve as inlets for allowing air to flow into the tapering gap.
In an alternative embodiment, the enclosing body 4 of the preferred embodiment has a plurality of holes in its lower region which serve as inlets for allowing air to flow into the tapering gap.
In another embodiment, secondary air inlets towards the upper portion of the vertical portion of the combustion chamber are embossed such that said embossed secondary air inlets 13 direct rising air from the convective air current at the top of the tapering gap 12 downwards into the vertical portion 2 of the L-shaped combustion chamber.
In an additional embodiment, the stove assembly is incorporated in existing traditional mud stoves.
In another embodiment, the stove assembly is incorporated in any outer body of any make (cylindrical, oval, square, rectangular etc.) and material (metal, mud or other heat withstanding material).
In one embodiment, the enclosing body of the stove assembly has an angle of inclination (i.e., angle formed between the X-axis and the outer surface of the enclosing body) of 95 to 110 degrees. In yet another embodiment, the stove assembly is used in combination with a stand on which the vessel or items to be heated can be placed.
In another embodiment, the invention is a method of assembling a stove assembly by placing a hollow enclosing body 4 on a hollow L-shaped combustion chamber 1 wherein:
a) said hollow L-shaped combustion chamber 1 comprises,
i) a vertical portion 2 for burning fuel, with an opening at the top 10 through which heat and exhaust fumes can exit, and
ii) a horizontal portion 3, with an opening 9 for entry of fuel and air; and
b) said enclosing body 4 comprises,
i) a tapered portion, surrounding the vertical portion 2 of the L-shaped combustion chamber 1 thereby creating a vertically tapering gap 12 between the vertical portion 2 of the L-shaped combustion chamber and the tapered portion of the enclosing body 4; and
ii) a cut out portion 11 towards the bottom of the enclosing body 4, said cut out portion designed to enable the enclosing body to fit on to the horizontal portion 3 of the L- shaped combustion chamber 1 such that leakage of air is restricted at the intersection of the enclosing body and horizontal portion of the L-shaped combustion chamber;
and wherein the air in the tapering gap 12 gets heated and rises upwards due to the heat from the external wall of the L-shaped combustion chamber 1 thereby creating a convective air current upwards;
and wherein the vertical portion 2 of the L-shaped combustion chamber 1 has secondary air inlets towards its upper portion which direct rising air from the convective air current at the top of the tapering gap 12 into the vertical portion of the L-shaped combustion chamber for better combustion due to mixing of heated air from the convective current with combustible volatile gases in the vertical portion of the L-shaped combustion chamber.
In a further embodiment, the method of assembling the stove assembly further includes forming said hollow enclosing body 4 by rolling a sheet 8 having said cut out portion 11. In another embodiment, the invention is a method of heating, using a stove assembly having a hollow L-shaped combustion chamber 1 surrounded by a tapered hollow enclosing body 4, said method of heating comprising the steps of:
a) burning fuel in the L-shaped combustion chamber thereby generating combustible volatile gases which rise towards an upper part of the L-shaped combustion chamber;
b) heating a vertical portion 2 of the L-shaped combustion chamber, said heating of the vertical portion caused by burning fuel in the L-shaped combustion chamber;
c) heating air in a vertically tapering gap 12 between the vertical portion of the L-shaped combustion chamber and the surrounding tapered hollow enclosing body, wherein said heating of air is caused by heat from the vertical portion of the L-shaped combustion chamber and wherein the heated air rises to form a convection current of rising air in the vertically tapering gap due to change in the density of air with the change in temperature; d) increasing velocity of the rising air in the convection current, said increase in velocity of rising air caused by reduction in area towards an upper tapered part of the tapering gap; and
e) directing the convection current of rising air having increased velocity into the upper portion of the L-shaped combustion chamber through secondary air inlets 7 in the upper portion of the L-shaped combustion chamber and mixing said rising air with the combustible volatile gases in the upper portion of the L-shaped combustion chamber thereby causing the combustible volatile gases to burn and generate heat;
and wherein leakage of air at an intersection of the enclosing body and a horizontal portion 3 of the L-shaped combustion chamber is restricted by providing a cut out portion 11 in a lower region of the enclosing body, said cut out portion designed to enable the enclosing body to match and fit on to the horizontal portion of the L-shaped combustion chamber.
The present invention is directed towards solving the problem of harmful emissions emitted from inefficient traditional stoves as well as open fires. The invention relates to providing air (oxygen) in excess of the stoichiometric ratio required for the complete combustion of the solid biomass fuel. The present invention also relates to the method of working of a stove assembly for combustion of fuel.
The present invention also relates to the method of assembly of a stove assembly for heating.
The examples of embodiments of the inventions are described in greater detail with reference to the accompanying exemplary Drawings hereafter.
In an embodiment, the invention is a stove assembly comprising a hollow L-shaped combustion chamber 1 on which a hollow enclosing body 4 is closely fitted. The frontal opening in the horizontal portion of the L-shaped combustion chamber serves as the entry for fuel as well as primary air. Towards the top portion of the combustion chamber there are a plurality of holes which serve as secondary air inlets 7 to the combustion chamber. The L-shaped combustion chamber and enclosing body are placed on a base 5 which is elevated from the floor. The base 5 has a plurality of holes 6 towards its periphery.
The air in the tapering gap 12 between the combustion chamber 1 and the enclosing body 4 gets heated up when fuel is burnt in the combustion chamber. This hot air rises up and gets into the vertical portion of the combustion chamber via the secondary air inlets. The air which enters the combustion chamber creates an empty space in the tapering gap. Since every system has a tendency to achieve equilibrium, cold air from the surrounding enters the tapering gap to fill this void space. This cold air in turn comes in thermal communication with the heated external wall of the combustion chamber, gets heated and rises up. Thus a convective current is formed due to change in the density of air with the change in temperature.
Fig. 6 illustrates secondary air entering the tapering gap 12 through the holes 6 in the base. Fig. 6 also illustrates the heated air in the tapering gap rising with the convection current and entering the vertical portion 2 of the combustion chamber thereby ensuring better combustion.
The tapering gap created by the enclosing body provides a differential area for air exit. This reduction in area towards the exit increases the velocity of air which in turn causes better mixing with the combustible volatile gases. These volatile gases which would have otherwise escaped into the environment get burnt due to the secondary air thereby ensuring better heating and reduction in fumes and harmful emissions. The enclosing body having a tapered structure directs air with increased velocity into the combustion chamber causing better combustion & heating and reduction in fumes and harmful emissions.
The wall of the combustion chamber separates the secondary air inside the tapering gap from the primary air coming inside the combustion chamber through its frontal opening in the horizontal portion. The secondary air coming inside the combustion chamber through the secondary inlet apertures can be directed downwards towards the burning fuel (point of combustion) causing a better combustion of the fuel. This can be achieved by embossing 13 the secondary inlet apertures (holes protruding above the datum like in the case of vegetable shredder/grate) and pointing them downwards so as to direct air towards the burning fuel.
The enclosing body has a cut out portion 11 which is designed to match and fit on to the horizontal portion of the combustion chamber such that leakage of air from the tapered gap is restricted. Fig. 7 illustrates how a sheet 8 can be designed and cut with a cut out portion and then rolled and formed into the enclosing body.
The gap between the enclosing body cut out portion and horizontal portion of the combustion chamber is sought to be restricted but not eliminated. Having a slight gap helps avoid stress to the stove assembly even when the different parts of the assembly expand & contract at different rates due to constant heating & cooling.
The enclosing body cuts down the radiation losses emitting from the combustion chamber. The enclosing body acts as a barrier to heat transfer so that most of the heat gets retained in the combustion chamber itself or in the tapering gap.
The present invention can, in an additional embodiment, be incorporated in existing traditional mud stoves or any other outer body of any make and material provided the stove assembly is at an elevation from the ground so as to allow the entry of air into the tapering gap. In another embodiment, the present invention can be used in combination with a stand on which the vessel or items to be heated can be placed. The stove assembly should be placed in the center and below the stand.
In an alternative embodiment, instead of having the air inlets for the tapering gap in the base, the air inlets can be on the side of the enclosing body towards the bottom. This way the assembly need not be placed on an elevated base.
In an additional embodiment, a fuel support 14 (i.e., grate) preferably made of sheet metal with ventilation holes, wire rods, wire mesh or the like can also be used in the present invention to place the fuel and then insert it inside the horizontal portion of the combustion chamber 1. The fuel support ensures that air is provided to the lower surface of the fuel thereby ensuring better combustion of fuel. The fuel support also separates ash and charcoal from the fuel which would otherwise get accumulated on the fuel itself and would have minimized the air supply to the fuel. The fuel support can be of any length and size depending on the size of the horizontal portion 3 of the combustion chamber.
Even though the Drawing Figures show an L-shaped combustion chamber having a cylindrical vertical portion, said vertical portion can be of any shape including square, rectangular, hexagonal, oval or any other shape. Similarly, the horizontal portion can be D-shaped, parabolic, square, rectangular or any other shape.
Slight variations of the L-shaped combustion chamber are also sought to be covered by this disclosure. For example, instead of being exactly L-shaped (i.e., 90 degrees), the combustion chamber may be angled at 80 degrees or 100 degrees etc and provide approximately the same functionality, thereby falling within the range of equivalency of the present invention.
The enclosing body also need not be only in the shape of a lampshade with straight sides as shown in the illustrative embodiment diagrams. It can be shaped in any manner as long as it has a tapered part. In this specification, the word tapering, as applied to the enclosing body, means an overall vertical narrowing, from bottom to top, of the enclosing body whether gradual, abrupt, stepped, straight or curved. INDUSTRIAL APPLICABILITY;
The present invention, has the following uses:
a) cooking food,
b) heating food or other items,
c) as a source of heat in cold weather, and
d) burning waste materials with minimal smoke and harmful emissions.
In the preceding description, all numbers disclosed herein are approximate values, regardless whether the word "about" or "approximate" is used in connection therewith.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, or components, but do not preclude or rule out the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
The process steps, method steps, protocols, or the like may be described in a sequential order, such processes, methods, and protocol may be configured to work in alternate orders. In other words, any sequence or order of steps that may be described does not necessarily indicate a requirement that the steps be performed in that order. The steps of processes described herein may be performed in any order practical. Further, some steps may be performed simultaneously, in parallel, or concurrently.
The aim of this specification is to describe the invention without limiting the invention to any one embodiment or specific collection of features. A person skilled in the relevant art may realize the variations from the specific embodiments that will nonetheless fall within the scope of the invention, and such variations are deemed to be within the scope of the current invention. It may be appreciated that various other modifications and changes may be made to the embodiment described without departing from the spirit and scope of the invention.

Claims

WE CLAIM,
1. A stove assembly comprising:
a) a hollow L-shaped combustion chamber comprising,
i) a vertical portion for burning fuel, with an opening at the top through which heat and exhaust fumes can exit, and
ii) a horizontal portion, with an opening for entry of fuel and air; and
b) a hollow enclosing body which encloses the L-shaped combustion chamber, said enclosing body comprising,
i) a tapered portion, surrounding the vertical portion of the L-shaped combustion chamber thereby creating a vertically tapering gap between the vertical portion of the L-shaped combustion chamber and the tapered portion of the enclosing body; and
ii) a cut out portion towards the bottom of the enclosing body, said cut out portion designed to enable the enclosing body to fit on to the horizontal portion of the L-shaped combustion chamber such that leakage of air is restricted at the intersection of the enclosing body and horizontal portion of the L-shaped combustion chamber;
and wherein the air in the tapering gap gets heated and rises upwards due to the heat from the external wall of the L-shaped combustion chamber thereby creating a convective air current upwards;
and wherein the vertical portion of the L-shaped combustion chamber has secondary air inlets towards its upper portion which direct rising air from the convective air current at the top of the tapering gap into the vertical portion of the L-shaped combustion chamber for better combustion due to mixing of heated air from the convective current with combustible volatile gases in the vertical portion of the L-shaped combustion chamber.
2. The stove assembly of claim 1 further comprising a base, elevated from the floor, on which the L-shaped combustion chamber and the enclosing body are placed, said base having a plurality of holes towards the periphery of the base which serve as inlets for allowing air to flow into the tapering gap.
3. The stove assembly of claim 1 wherein the enclosing body of the preferred embodiment has a plurality of holes in its lower region which serve as inlets for allowing air to flow into the tapering gap.
4. The stove assembly of claim 1 wherein the secondary air inlets towards the upper portion of the vertical portion of the L-shaped combustion chamber are embossed such that said embossed secondary air inlets direct rising air from the convective air current at the top of the tapering gap downwards into the vertical portion of the L-shaped combustion chamber.
5. The stove assembly of claim 1 contained in an outer body, wherein said outer body,
a) is made of mud; or
b) is made of metal or a heat withstanding material and has a cylindrical, oval, square or rectangular shape.
6. The stove assembly of claim 1 wherein the hollow enclosing body has an angle of inclination of 95 to 110 degrees.
7. A method of assembling a stove assembly by placing a hollow enclosing body on a hollow L- shaped combustion chamber wherein:
a) said hollow L-shaped combustion chamber comprises,
i) a vertical portion for burning fuel, with an opening at the top through which heat and exhaust fumes can exit, and
ii) a horizontal portion, with an opening for entry of fuel and air; and
b) said enclosing body comprises,
i) a tapered portion, surrounding the vertical portion of the L-shaped combustion chamber thereby creating a vertically tapering gap between the vertical portion of the L-shaped combustion chamber and the tapered portion of the enclosing body; and
ii) a cut out portion towards the bottom of the enclosing body, said cut out portion designed to enable the enclosing body to fit on to the horizontal portion of the L-shaped combustion chamber such that leakage of air is restricted at the intersection of the enclosing body and horizontal portion of the L-shaped combustion chamber; and wherein the air in the tapering gap gets heated and rises upwards due to the heat from the external wall of the L-shaped combustion chamber thereby creating a convective air current upwards;
and wherein the vertical portion of the L-shaped combustion chamber has secondary air inlets towards its upper portion which direct rising air from the convective air current at the top of the tapering gap into the vertical portion of the L-shaped combustion chamber for better combustion due to mixing of heated air from the convective current with combustible volatile gases in the vertical portion of the L-shaped combustion chamber.
8. The method of assembling the stove assembly of claim 7 wherein said hollow enclosing body is formed by rolling a sheet having said cut out portion.
9. A method of heating, using a stove assembly having a hollow L-shaped combustion chamber surrounded by a tapered hollow enclosing body, said method of heating comprising the steps of: a) burning fuel in the L-shaped combustion chamber thereby generating combustible volatile gases which rise towards an upper part of the L-shaped combustion chamber;
b) heating a vertical portion of the L-shaped combustion chamber, said heating of the vertical portion caused by burning fuel in the L-shaped combustion chamber;
c) heating air in a vertically tapering gap between the vertical portion of the L-shaped combustion chamber and the surrounding tapered hollow enclosing body, wherein said heating of air is caused by heat from the vertical portion of the L-shaped combustion chamber and wherein the heated air rises to form a convection current of rising air in the vertically tapering gap due to change in the density of air with the change in temperature; d) increasing velocity of the rising air in the convection current, said increase in velocity of rising air caused by reduction in area towards an upper tapered part of the tapering gap; and
e) directing the convection current of rising air having increased velocity into the upper portion of the L-shaped combustion chamber through secondary air inlets in the upper portion of the L-shaped combustion chamber and mixing said rising air with the combustible volatile gases in the upper portion of the L-shaped combustion chamber thereby causing the combustible volatile gases to burn and generate heat; and wherein leakage of air at an intersection of the enclosing body and a horizontal portion of the L-shaped combustion chamber is restricted by providing a cut out portion in a lower region of the enclosing body, said cut out portion designed to enable the enclosing body to match and fit on to the horizontal portion of the L-shaped combustion chamber.
10. The method of heating of claim 9 further comprising, embossing the secondary air inlets such that they direct the convection current of rising air downwards into the upper portion of the L- shaped combustion chamber thereby causing enhanced mixing of rising air and combustible volatile gases leading to enhanced burning of combustible volatile gases and generation of heat.
PCT/IB2015/050773 2014-02-05 2015-02-02 Stove assembly with l-shaped combustion chamber in an enclosing body WO2015118437A2 (en)

Applications Claiming Priority (2)

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IN404MU2014 2014-02-05
IN404/MUM/2014 2014-02-05

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WO2015118437A3 WO2015118437A3 (en) 2015-12-10

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4972823A (en) * 1990-02-12 1990-11-27 Stadin Arne H Safety stove and burner assembly
GB2253050A (en) * 1991-02-14 1992-08-26 Jonathan Greenall A solid fuel heating appliance
US6978777B2 (en) * 2003-11-20 2005-12-27 Eastman Holding Company Cooking stove including invertible support rack, support rack with dual cooking surfaces, and methods of using same

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MX2014009187A (en) 2015-08-04
WO2015118437A3 (en) 2015-12-10

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