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Title:
FURNACE WITH MOVABLE-EXCHANGEBLE FIREBOX ON BIO FUEL IN SOLID STATE
Document Type and Number:
WIPO Patent Application WO/2011/129712
Kind Code:
A2
Abstract:
On the furnace the door (11) is opened placing in the cassette (2) with fuel (14) which should be previously compressed, then fire is lit from the cinder box, when fire starts burning fan (4) is started and on the thermostat desired temperature is set or in case of central heating heat water pump is started.

Inventors:
PETROVIC DRAGAN (RS)
Application Number:
PCT/RS2011/000005
Publication Date:
October 20, 2011
Filing Date:
March 25, 2011
Export Citation:
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Assignee:
PETROVIC DRAGAN (RS)
Domestic Patent References:
WO2010029567A22010-03-18
WO1981002194A11981-08-06
Foreign References:
DE413303C1925-05-05
CH106166A1924-08-01
CH200326A1938-10-15
FR784409A1935-07-22
Other References:
None
Download PDF:
Claims:
CLAIMS

1. System for combustion of bio-fuel in solid state-biomass- and wooden remainings in its natural form is part of a furnace with movable-exchangeable firebox on bio-fuel in solid state. Above the mentioned furnace consists of housing of the furnace and cassette of the furnace which acquires a function of a firebox when it is loaded with fuel and placed in the housing of the furnace. Cassette or movable-exchangeable firebox comprises of: a metal sheet of an appropriate thickness and quality resilient on great temperatures which is folded in the shape of cylinder of an appropriate width and length in the measurement of the furnace housing.

I am claiming that movable-exchangeable firebox can also be in a rectangular shape where such firebox has to be in the same measurement with sufficient drift marker so it could be placed in the furnace housing without touching the walls of the furnace housing.

Upper part of the firebox has to be opened throughout its whole surface opposite to the bottom part which surface is closed and has circular opening in the central area of the bottom part which serves for inflow of cold air and as an outage of one part of the ash. Above the mentioned circular opening is to be placed a central hollow pipe cut vertically along its length on many spots which is smaller in diameter from the circular opening of the bottom part so that there would be the outage of ash and also for additional inflow of the air to the central part of the fuel where at the same time it prevents from collapsing of the fuel into the air pillar which is being created in the above-mentioned central pipe which with proper regulation of air inflow helps gasification/ combustion of fuel where extensive amount of heat energy is being produced. That heat energy created by fuel combustion vertically is concentrated around the central vertical hollow pipe providing air inflow, cold air inflow moves on a natural path toward the top of the firebox and so concentrated and heated up it impacts the heat exchanger placed above movable-exchangeable firebox which is built in the upper part of the furnace housing. On the lower part of furnace housing there is a built in chamber for accepting part of ash falling through the circular opening on the bottom of the firebox in between the lower edge of the central vertical pipe and the edge of the circular opening at the bottom of the firebox. In the chamber for ash there is a that collects ash and can be taken out from the mentioned chamber which is hermetically sealed with the back wall of the .

Next to the chamber there is a built in fan connected with a tunnel to the above-mentioned chamber, at the end of the tunnel next to the chamber there is a built in stopple that closes and opens, and in that manner regulates cold air inflow into the central vertical pipe placed in the central part of the firebox.

Cold air inflow can also be regulated pulling out and putting in the located in the chamber. Above mentioned fan is turned on during the firing of the fuel lasting for only a few minutes and then is turned off, when cold air inflow is being controlled moving the lever connected to the stopple in the tunnel next to the chamber or in the other case with complete closing above- mentioned stopple and partial drawing out of the from the chamber.

2. Combustion system according to the claim No. 1 in which the central hollow pipe is cut vertically along its length on many spots.

3. Combustion system according to the claim No. 1 and No. 2 in which the central hollow pipe cut vertically along its length on many spots is placed vertically in the central part of the firebox at the centre of the circular opening at the bottom of the firebox for cold air inflow for combustion and for part of ash fall out.

4. Combustion system according to the pervious claims in which the central hollow pipe cut

vertically along its length on many spots is placed vertically in the central part of the firebox at the centre of the circular opening at the bottom of the firebox for controlled air inflow into the central part of the fuel of proper quality which should withstand the temperature of the fuel combustion.

5. Combustion system according to any of the previous claims from No. 1 to No. 4 includes depositing the fuel into the firebox and around the central hollow pipe cut vertically along its length on many spots provides controlled air inflow through the central part of the fuel inside the firebox throughout the whole height of the firebox.

6. Combustion system according to any of the previous claims from No. 1 to No. 5 includes a

dividing horizontal wall between the firebox and the chamber with the cinder box where horizontal wall in the middle and under the firebox has circular opening of the same diameter as firebox has.

7. Combustion system according to the claim No. 6 includes horizontal wall with a circular opening in the middle is attached to the bottom part of the furnace housing in-between the chamber for the cinder box and movable-exchangeable firebox.

8. Combustion system according to the claims No. 1, No. 6 and No. 7 includes a cart placed on the horizontal wall with circular opening in the middle that is dividing chamber for cinder box and firebox.

9. Combustion system according to the claims No. 1, No. 6, No. 7 and No. 8 includes door of the furnace housing that are hermetically closing the space provided for placing movable- exchangeable firebox.

10. Combustion system according to the claims No. 1, No. 6, No. 7, No. 8 and No. 9, during the opening of the door which are being opened from the top towards bottom, when they are completely opened they create horizontal plate in relation to furnace housing and in that case they play role of a carrier for the cart, cart that is being drawn out from the area of the furnace housing together with movable-exchangeable firebox that is being placed on the above- mentioned cart.

11. Combustion system according to the claims No. 1, No. 6, No. 7, No.8, No.9 and No.10 includes hollow pipes that are placed one next to each other and connected with a hard connection and this way as they are connected, it creates a panel above the firebox.

12. Combustion system according to the claims No. 1, No. 11 and No. 12 includes hollow pipes that are connected into a panel being placed in the upper part of the furnace housing above movable-exchangeable firebox are set up in that manner so that one end should be turned towards front part of the furnace and the other one towards the back part of the furnace housing, where in that case obtains a function of the heat exchanger.

13. Combustion system according to claims from No. 1 to No. 12 includes fans/ventilators that are placed in the back upper part of the furnace housing against openings of the hollow pipes which are placed above the firebox. Fans are connected with a cable to the room thermostat with which the room temperature and fans are regulated.

14. Combustion system according to the claim No. 13 furnace housing has exit for exhaustion

gasses.

15. Combustion system according to the claim No. 1 includes space in the furnace housing supposed for placement of a movable-exchangeable firebox coated with metal sheet and hermetically closed.

16. Combustion system according to the claims from No. 1 to No. 15 includes upper panel above heat exchanger that hermetically closes the whole system of furnace housing.

17. Combustion system according to the any of the claims includes heat exchangers in which

instead of air there is water that heats up and in that case hollow pipes are being connected spirally through which heated up water circulates and they are being connected with proper connectors to the house installations and onto radiators, where in that case we need to install pump for circulation of water.

18. Combustion system according to the claim No. 17 includes combining of a heat exchanger on air flow and on water or each type separately.

19. Combustion system according to all the previous claims includes possibility of rotating air heat exchanger so that the outflow of air can be also placed to the side of the furnace as it shown in the figure No. 1.

0. Combustion system according to claim No. 19 includes procedure of the system activation. The procedure is as follows: loading the movable-exchangeable firebox with fuel, fuel is being placed around the central hollow pipe cut vertically along its length on many spots, when movable-exchangeable firebox is loaded with fuel doors of the furnace housing are being opened until they take horizontal position in relation to the furnace, then moveable cart is being pulled out onto the horizontally opened door, onto the cart movable-exchangeable firebox loaded with fuel is placed, then the cart is being pushed into the space provided in the furnace housing, when the cart with movable-exchangeable firebox reaches its designated position and is locked in place, door has to be closed and to be secured by locks, then from the chamber designated for ash cinder box is drawn out in which burnt kindling is placed (most often paper), before that stopple is needed to be open in the tunnel between fan and a chamber for ash, when the process of burning kindling is over the fan is turned on and it needs a few minutes of operation until we can hear a sound of flame inside the furnace, then the fan is turned off and with opening and closing of stopple desired cold air inflow is being controlled. Flame that appears in the bottom area of the heat exchanger that is placed above the firebox goes around the heat exchanger above the upper part of the exchanger and then is being led towards exit for exhaustion gasses.

Description:
FURNACE WITH MOVABLE-EXCHANGEBLE FIREBOX

ON BIO FUEL IN SOLID STATE

TECHNICAL FIELD

Invention is a part of energetic sector that covers - acquiring heat energy with combustion of bio-fuels in solid state: sawdust, straw, reed, chaff, maze tree and other. Invention refers to the heating furnace that functions on hot air and hot water.

BACKGROUND ART

Invention solves the way of combusting renewable bio-fuel in solid state. In this way of combustion, which is different from the classical way of combustion where we acquire lower temperatures with extensive amounts of smoke and ash, we achieve high temperatures and negligible amount of smoke and ash.

Furnace for heating on renewable bio-fuels in solid state allows cheaper heating and environmentally cleaner heating than heating on fossil fuels or bio-fuels in classical type furnace. It is well known that bio-fuels being combusted in classical furnace releases a lot of smoke and remains a lot of ash, and we need considerable amounts of bio-fuels because of their fast burning. Furnace with movable-exchangeable firebox on bio-fuels in solid state does not have classical firebox like other furnaces, it has a cassette where u place and compress bio-fuel and placing it in to the furnace acquires the necessary role of firebox.

IMPORTANT NOTICE: bio-fuels should be in incoherent, mealy state in the form of wood chips, chaff and other.

DISCLOSURE OF INVENTION

Burning bio-fuels this way we can achieve maximum temperatures and negligible amounts of smoke and ash with maximizing time period of burning.

Brief description of the drawing

Invention is detailed described on the exemplary drawing were:

Fig. 1 - is showing the furnace and inside elements of the structure with the cassette together.

1. Housing of the furnace

2. Cassette where you place the bio-fuel

3. Hollow tubes

4. Fan with thermostat

5. Smoke exhaust

6. Heating plate

7. Cinder box

8. Opening at the lover part of the cassette for cold air circulation

9. Door hinges

10. Door lock

11. Door

12. Cart(cassette carrier)

13. Lower plate with opening for air circulation

14. Fuel

15. Metal coating

16. Central hollow pipe cut vertically along its length on many spots

17. Fan

18. Tunnel

19. Stopple