ES2739424T3 - Bioethanol stove - Google Patents

Abstract

Bioethanol stove (8) for lighting and burning bioethanol (3), where the stove (8) comprises at least the following elements: - a burner (9) that has a burner bed (10) that is formed in such a way comprising a base (30) and one or more walls (31) extending towards the base, where one or more of these walls are provided with passages or openings (32), and where, in the position of use, the base (30) is in the lowest possible position, and passages or openings (32) are provided at a height above the base, where the height is preferably between five millimeters and forty-five millimeters and, more preferably, between seven millimeters and thirty-five millimeters; - a separate tank (11) for storing bioethanol (3); and, - supply means (12) for supplying fuel (3) to the burner bed (10), where these supply means (12) have spraying means (26) to spray a fuel mixture (24) in the burner bed (10), as well as a carburetor (21) where the bioethanol (3) from the tank (11) is atomized and mixed with air (22) to form said fuel mixture (24).

Description

DESCRIPTION

Bioethanol stove

[0001] The present invention relates to a bioethanol stove.

[0002] More specifically, the present invention relates to a bioethanol stove intended for ignition and burning of bioethanol fuel.

[0003] Many types of bioethanol stoves of the aforementioned type are already known, but are open to considerable improvements.

[0004] With known bioethanol stoves, bioethanol is poured into a small channel or tank.

[0005] WO2012000562, for example, discloses an ethanol burner that is used to burn liquid ethanol, in particular bioethanol. Said burner has a burner cartridge with a burner base and walls that ascend from said burner base and that surround the burner base. A feeding device is provided to supply ethanol to the base. There is also a supply of quantity of fuel that is connected to the feeding device and maintains a constant liquid level in the base during a burning process.

[0006] After ignition, the bioethanol present is burned.

[0007] A first major problem with known bioethanol stoves is that refueling such a stove with fuel, more specifically with bioethanol, involves relatively considerable risks.

[0008] Bioethanol is a fairly volatile fuel, and after being heated it easily goes from the liquid phase to the gas phase.

[0009] In addition, gaseous bioethanol is highly flammable.

[0010] For this reason, after the stove has been burning for some time, bioethanol can only be added to the stove at any time when the stove has cooled sufficiently.

[0011] Otherwise, when the stove is replenished with bioethanol, the formation of gaseous bioethanol can occur which can be easily ignited.

[0012] This last aspect constitutes, of course, an enormous fire risk, given that not only can the materials near the stove be set on fire easily, but in this way the burning bioethanol can also cause substantial burns for the person resupplying the stove. .

[0013] The person who resupplies the stove normally holds a well-filled bottle or can of bioethanol during refueling, which in case of ignition of the gaseous bioethanol formed can slip from his hands due to an impact reaction and / or burn quickly, so that a large amount of fuel ignites.

[0014] All this can have disastrous consequences in a minimum time.

[0015] Accordingly, another disadvantage of known bioethanol stoves is that between the burning, the supply and the ignition of the stove again, a certain cooling period must be respected, which is far from being practical and so that The heating effect is partially lost during the waiting period.

[0016] Another disadvantage of bioethanol stoves is that a relatively large amount of bioethanol is always present in the stove, which can also easily ignite for the reasons mentioned, with a potential fire hazard as a result.

[0017] Another disadvantage of bioethanol stoves is that with these known bioethanol stoves, combustion takes place "in its own liquid" or "in its own tank", which, in practice, means that combustion and Flames directly cover the entire volume of bioethanol present in the stove.

[0018] This type of arrangement again constitutes a very considerable risk, but it also has another disadvantage, that is, that combustion is not complete or inefficient combustion takes place, so that an unpleasant smell is emitted and so that the user He often suffers headaches.

[0019] EP0405311 discloses equipment that provides a solution to such problems. The equipment is designed to produce a liquid vapor that can be transported in a carrier gas flow stream, with a mixing chamber provided with at least one input for a carrier gas stream, at least one atomizer for introducing liquid as a set of drops and at least one outlet for the carrier gas stream charged with the liquid vapor, where the mixing chamber is arranged at a distance from the mouth of the nozzle with a deflection surface for the portion of carrier gas charged with the set of drops, said surface is connected by the outlet for the carrier gas stream charged with the liquid vapor, and where a drainage means is provided for the drop parts that have separated and flowed together to form a liquid return, where the walls of the mixing chamber have a contact surface connected to a heating medium.

[0020] However, the objective of the present invention is to provide an alternative of a more effective solution for one or more of the aforementioned problems and / or others.

[0021] More specifically, the object of the invention is to provide an improved stove for the combustion of bioethanol that is safer in use and by which a better combustion is carried out.

[0022] For this purpose, the present invention relates to a bioethanol stove for igniting and burning bioethanol, where the stove comprises at least the following elements:

- a burner provided with a burner bed that is formed in such a way that it comprises a base and one or more walls extending towards the base, where one or more of these walls are provided with passages or openings and where, in the position in use, the base is in the lowest possible position, and the passages or openings are arranged at a height above the base, where the height is preferably between five millimeters and forty-five millimeters and, more preferably, between seven millimeters and thirty-five millimeters;

- a separate tank for bioethanol storage; Y,

- supply means for the supply of fuel to the burner bed, where these supply means are provided with spray means for spraying a fuel in the burner bed, as well as a carburetor where the bioethanol in the tank is atomized and mixed with air to form said fuel mixture.

[0023] A first great advantage of this type of bioethanol stove according to the invention is that the stove has a burner with a burner bed on which the fuel is distributed, more specifically pure bioethanol or a fuel mixture consisting of said bioethanol mixed with air.

[0024] Thus, during combustion of the fuel, the flame only comes into contact with a proportion of the bioethanol present in the stove, which, of course, contributes to the safety of said bioethanol stove according to the invention.

[0025] Another advantage of applying a burner bed is that bioethanol combustion can be obtained much better than with known bioethanol stoves, since combustion in its own liquid does not occur.

[0026] In the use position, the base is in the lowest possible position, and the passages or openings are at a height above the base, where the height is preferably between 5 millimeters and 45 millimeters and, more preferably , between 7 millimeters and 35 millimeters.

[0027] The openings provide an adequate oxygen supply for combustion with suitable high flames and complete combustion as a result.

[0028] The adequate oxygen supply thus prevents the well-known nuisance of the smell of bioethanol stoves and also the frequently cited headaches.

[0029] Another great advantage of a bioethanol stove according to the invention is that the stove has supply means for supplying fuel to the burner bed.

[0030] These delivery means allow the fuel to be dosed on the burner bed, where preferably the bioethanol has already been previously mixed with air so that optimum combustion is obtained.

[0031] In a bioethanol stove according to the invention, a complete combustion of the fuel takes place, so that users do not experience any discomfort caused by the smell, which is the case of known bioethanol stoves.

[0032] Another important advantage of a bioethanol stove according to the invention is that the bioethanol is stored in a separate tank, which, again, greatly limits the risk of fire hazard or, in any case, greatly reduces its consequences in comparison with what is the case in known bioethanol stoves.

[0033] In a preferred embodiment of a bioethanol stove according to the invention, the tank has a supply for refueling the tank with bioethanol, where preferably this bioethanol tank is arranged so that the tank can be filled safely while the stove is burning.

[0034] Preferably, for this purpose, the supply is provided at a certain distance from the burner bed in order to be able to safely supply the tank while the stove is burning.

[0035] A great advantage of these embodiments of a bioethanol stove according to the invention is that the risk of fire is greatly reduced again, while the ease of use increases.

[0036] After all, the person should no longer wait until the bioethanol stove has cooled sufficiently before the stove can be refilled with fuel, which is in fact the case with known bioethanol stoves.

[0037] This means, on the one hand, a saving of time, but in addition the heating effect of the stove no longer has to be interrupted, so that the efficiency of a bioethanol stove according to the invention when a space is heated is much greater than that of known bioethanol stoves.

[0038] In a possible embodiment of a bioethanol stove according to the invention, the tank is provided as a compartment in the burner bed.

[0039] Such an embodiment of a bioethanol stove according to the invention has the advantage that the stove can be made very compactly, while the stove is much safer than known bioethanol stoves, because of nature Closed fuel storage.

[0040] In another possible embodiment of a bioethanol stove according to the invention, the tank is provided at a certain distance from the burner bed, for example at a distance of at least 10 cm or, for example, at least 15 cm or at a distance of at least 20 cm or even more.

[0041] In these possible embodiments of a bioethanol stove according to the invention, emphasis is placed on safety and ease of use when refueling the stove with fuel and less on its compactness.

[0042] In another embodiment of a bioethanol stove according to the invention, an intermediate solution can be chosen where the tank of the stove is disposed near the burner bed, but far enough from it so that it can be refilled with fuel. while the stove is burning.

[0043] Another preferred aspect of a bioethanol stove according to the invention is to provide the stove with a pump and tubes with which the bioethanol or fuel present in the burner bed can be pumped back into the tank.

[0044] Preferably in said bioethanol stove according to the invention, the stove has a controller to automatically control the pump and an electronic circuit to extinguish the stove, where the controller is such that, when the stove is extinguished using the circuit Electronic, excess bioethanol or fuel from the burner bed is automatically pumped back into the tank. These types of possible embodiments of a bioethanol stove according to the invention are even more securely equipped, since after extinguishing the stove there is nothing or practically no bioethanol or fuel left in the burner bed, so that Highly flammable gaseous vapors can be produced due to the remaining heat present in the newly extinguished stove, which is in fact the case with known bioethanol stoves.

[0045] In order to better show the characteristics of the invention, various preferred embodiments of bioethanol stoves according to the invention will be described hereinafter, by means of an example without a limiting nature, with reference to the attached drawings, where:

Figure 1 schematically illustrates the operation of a known bioethanol stove;

Figure 2 schematically shows a first possible embodiment of a bioethanol stove according to the invention; Y

Figures 3 and 4 schematically show two other embodiments of a bioethanol stove according to the invention;

Figure 5 shows an improved embodiment of a part of a burner bed.

[0046] The bioethanol stove 1 shown schematically in Figure 1 is a bioethanol stove 1, as is known according to the state of the art.

[0047] This known bioethanol stove has a channel, tank or container that acts as a storage space 2 in which a user must pour the bioethanol 3 to be burned.

[0048] This storage space 2 typically has a base 4 and side walls 5, but is also open at the top 6.

[0049] In said known bioethanol stove 1, the bioethanol 3 present in the storage space 2 is ignited, whereby a flame 7 is formed.

[0050] The combustion of bioethanol 3 in the present takes place directly in the storage space 2, which in guild jargon is described as "combustion in its own liquid" or "combustion in its own tank".

[0051] A major disadvantage of this type of known configuration is the considerable risk of fire, for example due to spillage during refueling or self-ignition of gaseous bioethanol, as mentioned in the introduction.

[0052] The consequences of such a fire can also be substantial, because a large amount of bioethanol is in direct contact with the flame 7.

[0053] Another disadvantage of these known bioethanol stoves 1 is that with said "combustion in its own liquid" no complete combustion of the bioethanol takes place, at least from a chemical point of view.

[0054] In the case of a complete combustion of ethanol, that is, with a sufficient supply of oxygen and heat, the ethanol breaks into harmless and odorless water and carbon dioxide.

[0055] In the case of incomplete combustion of ethanol, all kinds of other derivative products that are harmful to health and that can cause considerable discomfort caused by the smell enter the air.

[0056] In the case of "combustion in its own liquid" insufficient oxygen can be provided to the focus of the fire to obtain complete combustion, with the disadvantages described as a result.

[0057] Figure 2 shows a first embodiment of a bioethanol stove 8 according to the invention.

[0058] This improved bioethanol stove 8 comprises a burner 9 which is provided with a burner bed 10. Although not shown in Figures 1 to 4, the burner bed 10 may be provided with passages or openings at a height by above its base, and above the fuel level shown here only schematically.

[0059] Bioethanol 3 is stored in a separate tank 11.

[0060] It is evident that the upper part 6 of the improved bioethanol in this case is closed or practically closed with a clear separation between the volume of the bioethanol 3 present in the stove and the real flame 7 or focus of the fire 7. In addition, the stove of improved bioethanol 8 has delivery means 12 for supplying the fuel 3, in this case pure bioethanol 3, to the burner bed 10.

[0061] In the example shown in Figure 2, these delivery means 12 are schematically shown as a tube or passage 13 to the burner bed 10, but in reality, these supply means 12 can be much more complicated, as will discuss in more detail with respect to figure 4.

[0062] Means for properly mixing the bioethanol 3 with air or oxygen and for the dosed supply of bioethanol 3 or the fuel mixture to the burner bed 10 can be provided herein.

[0063] The improved bioethanol stove 8 according to the invention is suitable for burning both bioethanol 95 and bioethanol 98.

[0064] An advantage of this arrangement according to the invention is that the volume of bioethanol 3 is stored separately in the tank 11 and is not in direct contact with the flame 7, so that the risk of starting a fire outside the tank Stove 8 is greatly reduced and, certainly, the scale of any fire of this type is greatly reduced.

[0065] Another advantage of this type of bioethanol stove 8 according to the invention is that only a limited amount of fuel is present in the burner bed 10, so that, again, the possibility of a large fire forming outside Stove 8 looks immensely reduced.

[0066] Another advantage of the improved bioethanol stove 8 is that the supply means 12 can adjust the nature and quantity of the fuel supplied to the burner bed 10, so that a much better combustion can be obtained, more specifically a combustion complete from a chemical point of view, so that no harmful gases and gases that cause a nuisance caused by the smell do not enter the environment.

[0067] The tank 11 has a lockable supply 14 for filling the tank 11 with bioethanol 3.

[0068] Preferably, this supply 14 is arranged so that the tank 11 can be filled with bioethanol 3 safely, and preferably while the stove 8 is burning.

[0069] To enable safe filling of bioethanol 3 in the tank 11, for this purpose, the mouth 15 of the supply 14 can be arranged at a sufficiently large distance from the burner bed 10, for example.

[0070] The improved bioethanol stove 8 according to the invention is preferably provided with a pump 16 and tubes 17 with which the bioethanol 3 or fuel present in the burner bed 10 can be pumped back into the tank 11.

[0071] As is also the case in Figures 2 to 4, the improved bioethanol stove 8 is preferably provided with a controller 18 to automatically control the pump 16 and an electronic circuit 19 to extinguish the improved bioethanol stove 8.

[0072] Here, the controller 18 is preferably such that when the improved bioethanol stove 8 is extinguished, the bioethanol 3 or excess fuel in the burner bed 10 is automatically pumped back to the tank 11 with the aid of the electronic circuit 19.

[0073] With such an embodiment of a bioethanol stove 8 with automated shut-off protection in the form of controller 18 and circuit 19, the risk of a fire outside the burner 9 is further reduced, because the stove 8 can be extinguished quickly and because immediately after extinguishing the stove 8, all the remains, even a limited amount, of bioethanol 3 or fuel in the burner bed 11 are immediately and automatically removed with the pump 16 through the tubes 17.

[0074] In the embodiment of Figure 2, the tank 11 of the improved bioethanol stove 8 is provided as a compartment in the burner bed 10.

[0075] In this way, a compact version of a bioethanol stove 8 according to the invention is obtained, but with quite limited possibilities of providing good control of the supply means 12 and with less chance of a safe refueling of the bioethanol tank 3.

[0076] Figure 3 shows a possible alternative embodiment of a bioethanol stove 8 according to the invention.

[0077] In this embodiment, the stove tank 8 is provided near the burner bed 11 and is no longer constructed as a single unit with the burner bed 11. Between the tank 11 and the burner bed 10, a tube 20 is provided for the supply of bioethanol 3 to the burner bed 10, which is part of the supply means 12 and where, in other embodiments, as mentioned above, all other types of other can be provided. facilities to improve combustion in the burner 9.

[0078] It is understood that, as a result, the separation between the real focus of the fire 7 and the bioethanol tank 3 is further increased, which contributes to the safety of this version of the improved bioethanol stove 8.

[0079] Figure 4 schematically shows another more developed embodiment of a bioethanol stove 8 according to the invention.

[0080] In this embodiment, the tank 11 is fixed at an even greater distance D from the burner bed 10.

[0081] This distance D is preferably at least 10 cm, more preferably at least 15 cm, and even better a distance D between the burner bed 10 and the tank 12 of at least 20 cm or more is applied.

[0082] It is understood that, by respecting said distance D, the risk of fire is subsequently reduced and the possibilities of resupplying the tank 11 safely with bioethanol 3 through supply 14 during combustion of the improved bioethanol stove 8 They also increase tremendously.

[0083] In addition, in this embodiment, there is sufficient space to provide all kinds of installations in the tube 20 or the supply means 12 with which the fuel supply to the burner bed 10 can be dosed and the like.

[0084] In the case of Figure 4, the supply means 12 are provided, for example, with a carburetor 21 where the bioethanol 3 of the tank 11 is atomized and mixed with air 22, which is guided to the carburetor 21 through of an inlet 23 to form a fuel mixture 24.

[0085] The bioethanol is guided from the tank 11 to the carburetor 21 and then to the burner bed 10 by means of a pump 25.

[0086] In addition, the supply means 12 are provided with spray means 26 in the form of a manifold or the like with which the fuel mixture 24 is sprayed onto the burner bed 10.

[0087] The supply means 12 also comprise a control 27 for controlling the amount of fuel mixture 24 to be sprayed on the burner bed 10.

[0088] The control 27 comprises an adjustable valve 28 that closes the supply to the burner bed 10 to a greater or lesser extent.

[0089] For the adjustment of the state of the valve 28 and, therefore, to control the flow of fuel mixture 24 to the burner bed 10, the control 27 has an electronic control device 29.

[0090] In this embodiment of a bioethanol stove 8 according to the invention, the fuel mixture 24 is thus systematically injected into the burner bed 10 by means of spraying means 26.

[0091] The electronic control apparatus 29 determines the amount of fuel mixture 24 that can be injected into the burner bed 10, as well as the mixing ratio between air and bioethanol 3 corresponding at least preferably to the ratio between the oxygen and ethanol needed for complete combustion according to:

2 C ² H ⁶ + 7 O ² = 4 CO ² + 6 H ² O

[0092] Thus, after combustion, only innocuous and odorless water and carbon dioxide are formed and carbon monoxide or other harmful gases are formed, for example.

[0093] With a bioethanol stove 8 according to the invention, both open combustion and closed combustion can be applied.

[0094] The improved bioethanol stove 8 according to the invention is preferably placed in a housing that is easy to convert into a double or triple device.

[0095] Figure 5 shows a part of a specific embodiment of a burner bed 10.

[0096] It is clear that the principles and details can be applied in each of the previously mentioned embodiments.

[0097] Here, the burner bed 10 has an essentially "V" shaped section and, for this purpose, comprises a base 30 and two oblique walls 31, which extend towards the base 30.

[0098] Here, both walls 31 are provided with passages or openings 32.

[0099] In the use position, the base 30 is in the lowest possible position, and the passages or openings 32 are at a height above the base 30 where the height is preferably between 5 millimeters and 45 millimeters, and more preferably between 7 millimeters and 25 millimeters, for example 10 millimeters.

[0100] The passages or openings 32 have a diameter of between 2 and 20 millimeters, preferably between 4 and 12 millimeters, such as 5 millimeters in this case for example, and in this case they are arranged at a mutual distance of 40 millimeters. It is clear that the diameter and the mutual distance can be proportional: the larger the passages or openings 32 the greater the distance between the passages or openings 32.

[0101] Passages or openings 32 provide an adequate supply of oxygen for combustion with adequate and high flames and complete combustion as a result.

[0102] Proper oxygen supply thus prevents discomfort caused by the well-known odor of bioethanol stoves 8 and also frequently cited headaches.

[0103] The ends of these walls 31 away from the base are folded here so that they form essentially horizontal flanks 33 in the position of use that can rest on the vertical walls 34 of a wider U-shaped profile 35. The base 36 of the U-shaped profile 35 is provided under the base 30 of the burner bed 10 during use.

[0104] The "V" shaped burner bed 10 forms, so to speak, a cover with a "V" shaped groove in the U-shaped profile 35 that acts as protection and accommodates spilled fuel, by example due to movement during use. It is evident that the ends of all the aforementioned profiles are closed by suitable end walls 37.

[0105] The vertical side walls 34 of the U-shaped profile 35 and the essentially horizontal flanks 33 of the "V" shaped burner bed 10 in the use position are provided here with grooves 38 for the passage of air into the space between the "V" shaped burner bed 10 and the underlying U-shaped profile.

[0106] The invention is by no means limited to the embodiments of bioethanol stoves 8 according to the invention, described by way of example and illustrated in the drawings, but such bioethanol stoves 8 can be carried out in other ways. without departing from the scope of the invention as defined by the claims.

Claims (13)

1. Bioethanol stove (8) to ignite and burn bioethanol (3), where the stove (8) comprises at least the following elements: - a burner (9) having a burner bed (10) that is formed in such a way that it comprises a base (30) and one or more walls (31) extending towards the base, where one or more of these walls are provided with passages or openings (32), and where, in the position of use, the base (30) is in the lowest possible position, and the passages or openings (32) are provided at a height above the base, where the height is preferably between five millimeters and forty-five millimeters and, more preferably, between seven millimeters and thirty-five millimeters; - a separate tank (11) for the storage of bioethanol (3); Y, - supply means (12) for the supply of fuel (3) to the burner bed (10), where these supply means (12) have spray means (26) for spraying a fuel mixture (24) into the bed of burner (10), as well as a carburetor (21) where the bioethanol (3) of the tank (11) is atomized and mixed with air (22) to form said fuel mixture (24). 2. Bioethanol stove (8) according to claim 1, characterized in that the tank (11) is provided with a supply (14) to replenish the tank (11) with bioethanol (3). 3. Bioethanol stove (8) according to claim 2, characterized in that the supply (14) to replenish the tank (11) with bioethanol (3) is arranged in such a way that the tank (11) can be replenished safely while the stove (8) is burning. 4. Bioethanol stove (8) according to claim 3, characterized in that the supply (14) is provided at a certain distance from the burner bed (10) in order that the tank (11) can be filled without risk while the stove (8) is burning. 5. Bioethanol stove (8) according to one or more of the preceding claims, characterized in that the tank (11) is provided as a compartment in the burner bed (10). 6. Bioethanol stove (8) according to one or more of claims 1 to 4, characterized in that the tank (11) of the stove (8) is provided near the burner bed (10). 7. Bioethanol stove (8) according to one or more of claims 1 to 4, characterized in that the tank (11) is provided at a distance (D) of at least 10 cm from the burner bed (10) . A bioethanol stove (8) according to claim 7, characterized in that the tank (11) is provided at a distance (D) of at least 20 cm from the burner bed (10). 9. Bioethanol stove (8) according to one or more of the preceding claims, characterized in that a tube (20) is provided between the tank (11) and the burner bed (10) for the supply of bioethanol ( 3) to the burner bed (10). A bioethanol stove (8) according to one or more of the preceding claims, characterized in that the supply means (12) are provided with a control (27) to control the amount of the fuel mixture (24) to be sprayed on the burner bed (10). 11. Bioethanol stove (8) according to claim 10, characterized in that the above-mentioned control (27) comprises an electronic control device (29). 12. Bioethanol stove (8) according to one or more of the preceding claims, characterized in that the stove (8) is provided with a pump (16) and tubes (17) with which the bioethanol (3) present in the burner bed (10) it can be pumped back to the tank (11). 13. Bioethanol stove (8) according to claim 12, characterized in that the stove (8) is provided with a controller (18) for automatic control of the pump (16) and with an electronic circuit (19) to extinguish the stove (8), where the controller (18) is such that when the stove is extinguished (8) with the help of the electronic circuit (19), the excess bioethanol (3) from the burner bed (10) It is automatically pumped back to the tank (11).