WO2016146191A1 - Ethanol furnace system having spring-mounted supply container - Google Patents

Abstract

The ethanol furnace system comprises an ethanol burner (52) having a burner cartridge (54), said ethanol burner being connected to a supply container (16) for ethanol (104) via a connection line (50). According to the invention, the supply container (16) is to be formed in a height-adjustable manner, wherein the height-adjustable supply container (16) is spring-mounted via a spring assembly (20), wherein the spring assembly (20) is formed in such a way that an ethanol level (112) in the supply container (16) during operation is continuously equal to an ethanol level (112) in the burner cartridge (54), wherein the supply container (16) can be raised by the spring assembly (20) when the ethanol-contents reduces, such that the level uniformity can be automatically adjusted.

Description

 Ethanol kiln system with spring-loaded storage vessel

The invention relates to an ethanol-fired furnace system, comprising a burner having a burner ethanol burner, with a storage vessel for ethanol, and with a connecting line between the storage vessel and the burner cartridge.

Such an ethanol-kiln system is known from WO 2012/000562 A1.

Ethanol furnaces, in particular those which are operated with bioethanol, have found widespread use, in particular as so-called decorative kilns.

In the said ethanol-kiln system, an ethanol burner is provided, the burner cartridge having a bottom with a V-shaped groove. This burner cassette is fed from a storage vessel, usually a refillable or replaceable canister, which supplies ethanol via a connecting line.

According to the currently applicable regulations can be burned in such burner cartridges that are not connected to a fireplace, in normal living spaces (about 60 m ³ - space) only up to 0.5 liters of ethanol per hour. Since the burning of ethanol produces carbon dioxide that is toxic at elevated levels, there are strict regulations on the amount of fuel that can be burned per hour in such an oven relative to the room.

Furthermore, it is an endeavor in the ethanol burner technology that prevails as possible during the firing process at a certain burner setting a constant burner output and thus a constant flame height. Moreover, especially in ethanol-Dekoöfen, which are in premises without fireplace, only a limited supply of ethanol in the storage container allowed. The refilling of the ethanol and the commissioning or a restart after filling the storage vessel should be able to be performed functionally reliable even for inexperienced people.

In practical use, it has also been shown that the burning behavior of such ovens is problematic as such. Depending on the filling level of the burner cartridge, the burning behavior changes, because the level within the burner cartridge drops as the burning progresses. As a result, the mixture of vaporized ethanol with oxygen is continuously seen at other locations over the height of the burner cassette, resulting in a combustion time over the inconsistent burner performance and associated changing flame pattern leads.

If the cassette is almost empty, only small blue flames appear. Furthermore, often result in almost empty-run cassette unwanted deflagration noise. In this phase, there is also a strong odor formation after unburned ethanol or the denaturants contained therein. These denaturants are mandatory in order to prevent bioethanol from being used unintended for the manufacture of alcoholic beverages.

Even in continuous operation odor is detected, especially if the burner behavior is not optimally adjusted.

In the burner system mentioned above, an intermediate vessel is still present between the storage vessel and the burner cartridge to which the ethanol from the storage vessel is first fed. From this intermediate container, the ethanol is then fed to the burner cassette.

From US 5,033,956 A, a system and method is known, via which a burner for controlling the respective amount of fuel burned more or less Fuel can be supplied. For this purpose, an intermediate vessel is arranged between a storage vessel and the actual burner in which a stationary combustion tube is arranged. The intermediate vessel is connected via a connecting line to the lower end of the vertical burner tube according to the principle of the communicating tube. A float system in the tundish prevents excess fuel from being supplied from a higher reservoir. To regulate the amount of fuel that is in the vertical burner tube, the tundish is adjustable in height. If it is lowered, the level of fuel in the vertical combustion tube is low, so that only a low heat output is possible. If the storage vessel is raised, the amount of fill in the vertical burner tube rises above the communicating connection, so that more fuel is then available and the heating power can thereby be increased.

It is an object of the present invention to provide a reliable ethanol furnace system that provides a structurally simple structure for a uniform burning performance, thus a consistent flame image, regardless of the level of the ethanol level in the storage vessel.

According to the invention the object is achieved in that the storage vessel is adjustable in height, wherein the height-adjustable storage vessel is resiliently mounted via a spring arrangement, wherein the spring arrangement is designed such that an ethanol level in the storage vessel during operation constantly equal to an ethanol level in the burner cartridge is, wherein the storage vessel is in each case so far raised with decreasing ethanol content by the spring assembly, that the level equality is set automatically.

This configuration of the resilient mounting of the storage vessel ensures that during operation an equal level of fuel prevails in the burner. This then leads to a consistent burner output and, associated with it, a consistent flame pattern. Through the communicating connection line between the storage vessel and the burner cartridge, the fuel flows in operation continuously from the storage vessel directly into the burner cartridge. The design of the spring assembly in that the ethanol level in the reservoir is consistent ensures that a consistent level of ethanol is ensured in the burner cartridge.

In operation, ethanol is continuously supplied from the storage vessel via the connecting line of the burner cassette and burns off there. Connected with this, the content of ethanol in the storage vessel continuously decreases. The associated weight loss of the storage vessel together with the ethanol present therein now causes the spring assembly, the storage vessel continuously lifts, in such a way that during operation, a constant ethanol level in the burner cartridge is ensured.

The corresponding characteristics of the spring arrangement are determined by calculation and empirically. That is, it is determined the weight of the storage vessel and the weight of the maximum amount of fuel to be absorbed. The spring arrangement is then designed such that, as the content of fuel in the storage vessel decreases, it is in each case raised in such a way that the fill level in the burner cassette remains unchanged. If one knows the spring constant and the weight of storage vessel plus contained ethanol, the corresponding tracking, ie lifting the storage vessel with decreasing ethanol content, can be determined.

Suitable springs are mechanical springs, such as helical springs, in particular cylindrical helical springs, be it tension or compression springs or gas-pressure or liquid-based springs. These should have as linear a spring constant as possible.

In a further embodiment of the invention, the storage vessel is suspended on the spring assembly suspended. This measure has the advantage that the hanging arrangement allows very simple trained and friction-minimized and inexpensive tension springs, for example, from a wire wound helical springs, which have a linear spring characteristic. This not only a mechanically simple and reliable spring arrangement is guaranteed, but it is also an economic design possible. This opens up a frictionless design of the spring arrangement.

In a further embodiment of the invention, the storage vessel is connected via the connecting line according to the principle of the communicating tube with the burner cartridge.

This measure has the advantage that the setting of the constant ethanol level in the burner cartridge can be ensured steadily and simply when the ethanol content in the storage vessel and the lifting associated with it decreases.

In a further embodiment, the storage vessel is directly, without an intermediate container, connected to the burner cartridge.

This measure has the advantage that the previously described process without flow obstacles, thus without time delay, is feasible. This also increases operational safety.

In a further embodiment of the invention, the storage vessel via an adjustment so far lowered that the ethanol level in the storage vessel comes to rest lower than a bottom of the burner cartridge.

This measure has the advantage that the storage vessel can be lowered by the adjusting mechanism so far that no more ethanol can be supplied via the connecting line of the burner cassette. This position can then, for example, be entered by the operator via the adjusting mechanism. be set if the burning process is to be interrupted. In this case, ethanol is sucked out of the burner cassette back into the storage vessel.

It makes sense that this lowered position is also that position which occupies the storage vessel when the burner system is not in operation or when the storage vessel to be refilled with ethanol. It can be ruled out that already unintentionally flows through the connecting line ethanol in the burner cartridge. This also represents an important safety aspect of such a kiln system.

In a further embodiment of the invention, the connecting line is in the storage vessel and is connected via a curved connecting portion with the burner cartridge.

This measure has the advantage that at each filling level of ethanol in the storage vessel ethanol is in the connecting line, so that no air can be sucked. The connection with the burner cassette is made via the bent connection section, so that the principle of the communicating tubes or containers, ie storage vessel on the one hand and burner cassette on the other hand, is thereby accomplished.

In a further embodiment of the invention, the connecting portion is above the maximum height level of the ethanol level in the burner cartridge.

This embodiment has the advantage that when filled with ethanol connecting line, the flow from the storage vessel to the burner cartridge by lowering the storage vessel is easily interrupted. After lowering the storage vessel below the level of the burner cassette, no flow of ethanol into the burner cassette can take place any more. It is also ensured that the ethanol still contained in the burner cartridge is returned to the reservoir. In a further embodiment of the invention, the curved connecting portion opens at its lowest point in the burner cartridge.

This measure has the advantage that when lowering the level of the storage vessel via the adjusting mechanism under the bottom of the burner cartridge, the entire ethanol is sucked out of the burner cartridge and transferred to the storage vessel. This contributes significantly to the reliability at the end of a firing process. There remain no amounts of ethanol in the burner, which then evaporate gradually and either lead to odors or, especially when the burner cartridge is still hot, lead to explosive ethanol vapor / air mixtures.

In addition, ethanol can be safely added to the storage vessel in this position.

For this purpose, it is of particular advantage that in the mouth region of the connecting portion is guided below the level of the bottom of the burner cartridge.

This creates a kind of siphon that ensures that the entire amount of ethanol is removed from the burner cartridge. Often, the bottom of such a burner cassette is designed as a V-shaped channel, so that it is then ensured that no residual amounts of ethanol remain in the channel.

In a further embodiment of the invention, a suction pump is arranged in the connecting line.

This measure has the advantage that, if the connecting line is filled with air, it can be filled by the suction pump with ethanol from the storage vessel. This state occurs, for example, during initial operation or when the supply of ethanol in the storage vessel has been completely used up, and in particular in the embodiment in which the storage vessel is lowered below the level of the bottom of the burner cassette in non-operation. The entire amount of ethanol is sucked through the communicating connection line into the storage vessel, with air entering the connection line. In a further embodiment of the invention, the suction pump is arranged in a bypass line which branches off from the connecting portion and which opens into the burner cartridge.

This measure has the advantage that for rapid flooding of the connecting line and the burner cartridge with ethanol, a relatively large diameter bypass line can be provided so that a few ethanol actuated connection between the storage vessel and the burner cartridge can be made by a few operations of the suction pump. It is an effort to operate such a kiln system as possible without electrical equipment or electrically powered engines. If the suction pump is designed as a hand-operated pump, a few pressure surges are sufficient to fill the connecting line with ethanol during commissioning or recommissioning. Through the communicating compound then sufficient ethanol flows into the burner cartridge. The feed during operation is made via the smaller diameter connecting line, which is sufficient to compensate for the low burn-off quantities (0.5 l / min).

In a further embodiment of the invention, a check valve is arranged in the suction, which blocks a return of ethanol in the storage vessel.

This measure has the advantage that in the embodiment with the adjustment mechanism for lowering the storage vessel, the ethanol must extend over the branch line and not in addition to the possibly cross-section-large bypass line. This promotes a targeted return when lowering the storage vessel. When starting or flooding the burner cartridge, no reflux of ethanol can take place.

In a further embodiment of the invention, the spring assembly has suspended tension springs, which are mounted at an upper end to a stationary suspension and are connected at the lower end to the storage vessel. This embodiment allows the use of mechanically simple and stable helical tension springs, which have a linear spring characteristic over other springs over a relatively long range. This type of suspension of the storage vessel is also structurally easy to accomplish, it results in easier assembly and disassembly, for example, by the tension springs are posted at its upper end to the suspension or at its junction with the storage vessel.

In a further embodiment of the invention, four parallel-connected tension springs are present, which are connected to the upper end of the storage vessel.

Since conventional storage vessels usually have a quadrangular horizontal cross-section, it is particularly easy to accomplish, to hang such a storage vessel at the four corners on the tension springs symmetrically to the center of gravity.

In a further embodiment of the invention, the adjusting mechanism on a cross bar, which is operable by an operator from outside.

This measure has the advantage that on the cross bar, the operator can take this from the outside and can easily perform the lowering of the storage vessel below the lowest level of the burner cartridge.

The storage vessel can only be moved downwards by the crossbar.

It is possible to provide a detachable or pivotable adjusting handle on the housing projecting from the crossbar, which is applied or attached when the storage vessel is to be lowered in order to be spent in the so-called zero position. In a further embodiment of the invention, the kiln system is housed in a housing which is transportable in its entirety.

This measure has the advantage that the kiln system is a self-contained structure that can be installed or installed as a module, for example as a furniture built-in oven in a niche in a building. At the same time, this opens up the possibility of simply transporting the kiln system, if it is not to be used in a closed room, to set it up, for example, on a balcony or terrace to serve as a decorative stove. Here you can then provide measures that allow a higher fuel performance, since then the exhaust gases can be discharged to the environment.

In a further embodiment of the invention, the burner can be covered by an adjustable cover from air supply.

This measure has the advantage that the flame can be extinguished by the adjustable cover and at the same time it is ensured that no air can still communicate with existing hot ethanol vapors, so that deflagration is excluded.

In a further embodiment of the invention, a valve is arranged in the connecting line, which blocks a flow of ethanol through the connecting line in one position.

This measure also meets the safety aspect to the effect that it can be ruled out in principle that ethanol is ever supplied to the burner. This valve should be closed during the aspiration process to allow the ethanol to flow through the bypass line.

In a further embodiment of the invention, a piezo igniter for igniting the ethanol is mounted in the burner. This measure, which is known per se, has the advantage that igniting the burner is easily accomplished without the need for matches, lighters or igniters supplied electrically by the power supply. This promotes the compact and self-sufficient design of the ethanol furnace system as mentioned above.

It is understood that the features mentioned above and those yet to be explained not only in the specified combinations, but also in other combinations or alone, without departing from the scope of the present invention. The invention will be described and explained in more detail below in conjunction with the accompanying drawings.

In the drawings:

FIG. 1 is a highly schematic side view of an ethanol kiln system in a zero position;

Figure 2 is a side view comparable to Figure 1 in a first operating position with a filled storage vessel;

FIG. 3 shows a representation comparable to FIGS. 1 and 2 with the storage vessel almost empty;

Figure 4 is an exploded view of the burner; and

Figure 5 is a perspective view of the received in a housing furnace system.

An ethanol-fired furnace system shown in the figures is indicated in its entirety by the reference numeral 10. Whenever the following is said of the kiln system, the burner or the burner cassette, it is meant in each case such a construction that is adapted and suitable exclusively for the combustion of ethanol. The term "ethanol" relates not only to the chemical substance ethyl alcohol, but in particular to bio-ethanol, which was produced exclusively from biomass, ie from a renewable carbon carrier or from the biodegradable fractions of waste.

The basic components of the kiln system 10 will first be described in conjunction with FIG. 1. The kiln system 10 is accommodated in a housing 12, as can be seen in particular from FIG. 5, wherein in the side view of FIG. 1, a front panel 14 can be seen.

In the interior of the housing 12, a storage vessel 16 in the form of a rectangular rectangular container 22 is arranged, as can be seen in particular from FIG. 5. At its upper end 18, the storage vessel 16 is connected to a spring arrangement 20.

The container 22 of the storage vessel 16 has a bottom 24 in which a depression 26 is provided centrally.

The four not shown here upstanding walls of the container 22 are closed by a cover 28. The top of the lid 28 is provided with four mounting flanges 30 which protrude upwardly from the lid 28. These four mounting flanges are symmetrically attached to the corner regions of the rectangular lid 28.

The spring assembly 20 has four cylindrical tension springs 34 which are each formed as helically wound from a wire material springs.

The respective lower end 32 of a tension spring 34 is connected to a mounting flange 30. The respective upper end 36 of a tension spring 34 is attached to a spring suspension 38.

The spring suspension 38 has two horizontally extending support 50, which are fixed at the end to mounting plates, which in turn are attached to the inside of the housing 12. Thus, the spring suspension 38 is fixedly arranged in the housing 12.

The four tension springs 34 are connected in parallel and their spring constants add up (R _ges = Ri + R2 + R3 + R ₄ ). The spring rate of the overall system of such a parallel circuit is greater than the spring rate of a single spring.

The lid 28 has an opening 44 through which a vertically standing filler pipe 42 extends.

At the upper end of the filling tube 42, a pivotable filling funnel 46 is attached.

The hopper 46 is accessible via a flap 48 of the housing 12, so that from the outside ethanol 104 can be spent on the hopper 46 and the filler pipe 42 in the storage vessel 16. It can be provided a corresponding level indicator.

In ethanol kilns, which are used in enclosed spaces of conventional size, currently a maximum of three liters are allowed in the storage vessel.

If the ethanol-kiln system is used outside of closed premises, larger stocks of ethanol can be kept, so that correspondingly larger storage containers can be provided. In this case, it may also be useful or for technical reasons necessary to provide the storage vessel around another container as a security container. An appropriate connection between the safety container and the storage Vessel 16 may then be transferred too much filled ethanol in the storage vessel 16.

The storage vessel 16 communicates via a connecting line 50 with a designated in its entirety by the reference numeral 52 burner.

The connecting line 50 has a vertically standing intake pipe 64 which is located in the interior of the storage vessel 16 and, with the exception of the "zero position" shown in FIG. 1, dips into the ethanol 104 received in the container 22.

The standing intake pipe 64 extends vertically far beyond the upper end 18 of the storage vessel 16 and then passes over a bent portion 66 in the side of the storage vessel 16 arranged burner 52 via. The bent portion 66 merges into a vertical inlet pipe 68 in the region of the burner 52.

As can be seen from Fig. 1, the bent portion 66 of the connecting line 50 is higher than the storage vessel 16 and burner 52nd

The exact connection with the burner 52 will be described in more detail below in connection with FIG. 4 and explained.

From Fig. 1 it can be seen that in the region of the bent portion 66 a branching point 78 is provided, from which a further upwardly projecting and approximately U-shaped curved intake pipe 72 is upright, the descending portion up to the lower end of the Brenners 52 is guided.

In the intake pipe 72, a manual suction pump 74 is arranged with a check valve.

The operating element of the manual suction pump 74 is mounted on the front panel 14 and can be operated from the outside. In the inlet pipe 68, is a ball valve 84 arranged, which serves as a shut-off or safety valve and which is also to operate from the outside.

As can be seen from Fig. 1, the diameter of the intake pipe 72 is slightly larger than the diameter of the connecting line 50. Thus, a designated in its entirety by the reference numeral 80 bypass line is created, the meaning and purpose of which described and explained in more detail below shall be.

From Fig. 1 it can also be seen that a total of the reference numeral 90 provided adjusting mechanism has a cross bar 92. The cross bar 92 is attached to at least one of the mounting flanges 30 and extends horizontally across the housing 12 and extends through an opening in the front panel 14 to the outside. The crossbar can be pushed down or moved.

As can be seen in particular from FIG. 5, a pivotable and also removable adjustment handle 96 is present there. This also serves as a level indicator. This also blocks an upward pivoting movement of the cross bar 92 about an articulation point on only one of the mounting flanges 30 as soon as the adjustment handle 96 abuts the housing.

From the protruding from the housing 12 portion of the cross bar 92 is inwardly in front of a locking pin 99, which can engage in a bore in the front panel 14. By the adjustment mechanism 90, the storage vessel 16 can be moved to a certain extent against the force of the springs 34 down.

First, with reference to Fig. 4, the detailed design of the burner 52 will be described. The burner 52 has an approximately rectangular, upwardly open burner cartridge 54 having at the lower end a closed bottom 55 which is formed as a V-shaped groove. On top of the burner cassette 54, a U-shaped grate 58 can be pushed, in which a particular hole pattern is recessed at openings. The side openings in the downwardly extending legs of the U-shaped combustion grate 58 are congruent with corresponding openings (not designated here in detail) in the side wall of the burner cassette 54.

Through these openings of the side walls, air may enter the interior of the burner cassette 54 to burn the ethanol contained therein.

The recessed at the top of the grate 58 openings allow the flames pass through and thus promote the formation of a specific, very decorative and evenly distributed flame image.

On the grate 58, a quenching plate 60 can be postponed, which is also formed as a U-shaped structure and whose hole pattern corresponds to the hole pattern of the burner grate 58.

In operation, the grate 58 is pushed from the top of the burner cartridge 54, wherein the downwardly reaching side edges engage over the side edges of the burner cassette 54, wherein in full load operation, the side openings of grate 58 and burner cassette 54 come to coincide.

By laterally displacing the quenching plate 60, for which an adjusting hook 62 is provided, the quenching plate 60 can be moved so that only a small oxygen supply takes place, whereby the flame image, in particular the flame height, can be changed or the oxygen supply is completely prevented , This also makes it possible to stifle the flames within a very short time.

From Fig. 4 it can also be seen that the intake pipe 72 of the bypass line 80 is connected to a side opening 76 of the burner cassette 54. In this case, the side opening 76 is so deep that it is as close as possible to the bottom 54 and its V-groove. Immediately before the side opening 76, an opening 70 is provided in the intake pipe 72, into which the inlet pipe 68 opens.

In this case, the inlet pipe 68 has a portion 82 which is lower than the side opening 76th

Returning to Fig. 1 and Figs. 2 and 3, the operation and the various operating positions of the ethanol-fired furnace system 10 will now be explained.

As already mentioned, the position of the storage vessel 16 shown in FIG. 1 corresponds to the zero position. The storage vessel 16 has been moved to this position by means of the adjusting mechanism 90, the storage vessel 16 has been moved against the pulling force of the springs 34 down until the locking pin 99 is engaged in the corresponding opening on the front panel 14 and the adjusting mechanism 90 and thus the storage vessel 16 holds in this position.

From Fig. 1 it can be seen that the level 108 of ethanol 104 in the storage vessel 16 below the bottom of the burner 52 comes to rest. The lower end of the stationary intake pipe 64 is no longer immersed in the ethanol 104, so that no ethanol can be transferred into the burner 52 in this operating state. In addition, the ball valve 84 is closed and the arc splitter 60 hermetically seals the interior of the burner cartridge 54 so that neither ethanol nor oxygen can enter the burner cartridge 54.

For start-up and for firing the locking pin 99 is withdrawn from the opening in the front panel 14 and the storage vessel 16 is moved by the force of the springs 34, depending on the level, vertically upwards. In the process, the standing intake pipe 64 dips into the ethanol 104 in the container 22.

If the level should be low or no ethanol 104 at all, this can be refilled via the hopper 46, wherein the optimum or maximum level can be displayed via a level indicator 1 14, which is arranged in the region of the adjustment handle 96. Such a condition is shown for example in FIG.

The firing of the burner cassette 54 is now proceeded as follows. The ball valve 84 remains or is closed.

Now, the manual suction pump 74 is actuated, whereby over the standing intake pipe 64 and the branching point 78 and the bypass line 80, ethanol is transferred into the burner cassette 54 (see arrow 81). Here are some pumping strokes. The check valve in the manual suction pump 74 prevents backflow of ethanol. The air is removed from the line system and replaced by ethanol 104. Now, a communicating connection between the ethanol 104 in the storage vessel 16 and the interior of the burner cassette 54 is accomplished. The check valve of the manual suction pump 74 now blocks a further flow, which now leads only to the opening of the ball valve 84 via the connecting line 50, as shown in Fig. 2 by the arrow 85.

As much ethanol 104 flows into the burner cassette 54 until the level 1 12 in the burner cassette 54 is the same as the level 1 12 in the storage vessel 16.

This means that the structural design, in particular the force of the springs 34, is set so that after the release of the adjusting mechanism 90, the storage vessel 16 adjusts to the height shown in Fig. 2. This ensures that a certain desired liquid level 1 12 is set in the burner cassette 54, but not higher. Now can be set on the piezoelectric igniter 100 of the burning process in motion.

Since burns the ethanol contained in the burner cartridge 54 104 burns, this flows continuously according to the principle of communicating tubes from the storage vessel 16, both levels 1 12 remain permanently the same and thus adjusted automatically. Due to the fact that gradually more and more ethanol 104 flows via the connecting line 50 from the container 22 of the storage vessel 16 into the burner 52 and is burned there, the total weight of the storage vessel 16 and the ethanol 104 absorbed therein decreases steadily ,

The tension springs 34 and their construction and spring constant are now adjusted so that the storage vessel 16 is gradually moved vertically upward, as shown in Fig. 2 by the arrow 87. This adjustment is in line with ethanol consumption, ensuring that level uniformity at levels 1 12 is maintained.

FIG. 3 shows a situation in which the storage vessel 16 has moved into a maximally raised position.

Again, it can be seen again that the level 1 12 of the ethanol 104 in the container 22 is still the same as the level 1 12 in the burner 52nd

To terminate the burning process, the storage vessel 16 is moved downwards via the adjusting mechanism 90. In this case, the ethanol level in the container 22 shifts below the level that prevails in the burner cassette 54. Since these two containers are connected via the connecting line 50 according to the principle of communicating tubes, now the remaining amount of ethanol remaining in the burner cassette 54 flows back via the connecting line 50 into the storage vessel 16, which is indicated by the flow arrows 93 in FIG.

By means of the section 82 of the connecting line 50, which is located below the bottom 55 of the burner cassette 54 in connection with FIG. 4 in particular, it is ensured that the interior of the burner cassette 54 is completely sucked empty. This vacuuming takes place within a few seconds. At the same time, the grate 58 is closed via the quenching plate 60. Subsequently, the ball valve 84 is closed. The storage vessel 16 is now again in the zero position shown in Fig. 1. It can now be refilled ethanol or the burning process are interrupted until a next process is desired.

Claims

claims 1 . Ethanol-kiln system,  with a burner cartridge (54) having an ethanol burner (52), with a storage vessel (16) for ethanol (104), and  with a connecting line (50) between the storage vessel (16) and the burner cassette (54),  characterized in that the storage vessel (16) is adjustable in height, wherein the height-adjustable storage vessel (16) via a spring arrangement (20) is resiliently mounted, wherein the spring arrangement (20) is designed such that an ethanol level (1 12) in the storage vessel (16) during operation is constantly equal to an ethanol level (1 12) in the burner cassette (54), wherein the storage vessel (16) with decreasing ethanol content by the spring assembly (20) in each case can be raised so far that the level equality is automatically adjustable. 2. ethanol-kiln system according to claim 1, characterized in that the storage vessel (16) on the spring assembly (20) is suspended suspended. 3. ethanol furnace system according to claim 1 or 2, characterized in that the storage vessel (16) via the connecting line (50) according to the principle of the communicating tubes with the burner cartridge (54) is connected. 4. ethanol furnace system according to claim 3, characterized in that the storage vessel (16) directly, without an intermediate container, with the burner cartridge (54) is connected. 5. ethanol furnace system according to one of claims 1 to 4, characterized in that the storage vessel (16) via an adjusting mechanism (90) is lowered so far that the ethanol level (1 12) in the storage vessel (16) is lower than a bottom (55) of the burner cassette (54). 6. Ethanol-kiln system according to one of claims 1 to 5, characterized in that the connecting line (50) in the storage vessel (16) and is connected via a curved connecting portion (66) with the burner cassette (54). 7. Ethanol-kiln system according to claim 6, characterized in that the connecting portion (66) above the maximum height level of the ethanol levels (1 12) extends. 8. Ethanol-kiln system according to claim 6 or 7, characterized in that the curved connecting portion (66) at a lowest point in the burner cartridge (54) opens. 9. Ethanol-kiln system according to claim 8, characterized in that in the mouth region of the connecting portion (66) below the level of the bottom (55) of the burner cartridge (54). 10. ethanol furnace system according to one of claims 1 to 9, characterized in that in the connecting line (50) a suction pump (74) is arranged. 1 1. Ethanol furnace system according to claim 10, characterized in that the suction pump (74) is arranged in a bypass line (80) which branches off from the bent connecting portion (66) and which opens into the burner cassette (54). 12. Ethanol-Brennofensystem according to claim 10 or 1 1, characterized in that in the suction pump (74), a check valve is arranged, which blocks a return of ethanol in the storage vessel (16). 13. Ethanol-kiln system according to one of claims 1 to 12, characterized in that the spring arrangement (20) has hanging tension springs (34), the an upper end (36) are mounted on a stationary suspension (38) and at the lower end (32) are connected to the storage vessel (16). 14. Ethanol-kiln system according to claim 13, characterized in that four cylindrical tension springs (34) are present, which are connected symmetrically to the center of gravity of the storage vessel 16 with an upper end (18) of the storage vessel (16). 15. Ethanol-kiln system according to one of claims 5 to 14, characterized in that the adjusting mechanism (90) has a cross bar (92) which is operable by an operator from outside. 16. Ethanol-kiln system according to one of claims 1 to 15, characterized in that the kiln system (10) in a housing (12) is accommodated, which is transportable in its entirety. 17. Ethanol-kiln system according to one of claims 1 to 16, characterized in that the ethanol burner (52) via an adjustable cover (60) from air supply can be covered. 18. Ethanol-kiln system according to one of claims 1 to 17, characterized in that in the connecting line (50) a valve (84) is arranged, which blocks in one position, a flow of ethanol and air through the connecting line (50). 19. Ethanol-kiln system according to one of claims 1 to 18, characterized in that a piezo igniter (100) for igniting the ethanol (104) is mounted on the burner (52).