AT516424B1 - Device and method for operating a flame - Google Patents

Device and method for operating a flame Download PDF

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Publication number
AT516424B1
AT516424B1 ATA50772/2014A AT507722014A AT516424B1 AT 516424 B1 AT516424 B1 AT 516424B1 AT 507722014 A AT507722014 A AT 507722014A AT 516424 B1 AT516424 B1 AT 516424B1
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AT
Austria
Prior art keywords
flame
oxidizing agent
combustible material
nozzle
main
Prior art date
Application number
ATA50772/2014A
Other languages
German (de)
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AT516424A1 (en
Original Assignee
Dr Fabrice Louis Michel Giuliani
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Application filed by Dr Fabrice Louis Michel Giuliani filed Critical Dr Fabrice Louis Michel Giuliani
Priority to ATA50772/2014A priority Critical patent/AT516424B1/en
Publication of AT516424A1 publication Critical patent/AT516424A1/en
Application granted granted Critical
Publication of AT516424B1 publication Critical patent/AT516424B1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23QIGNITION; EXTINGUISHING-DEVICES
    • F23Q9/00Pilot flame igniters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D14/00Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/26Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid with provision for a retention flame
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D17/00Burners for combustion conjointly or alternatively of gaseous or liquid or pulverulent fuel
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23NREGULATING OR CONTROLLING COMBUSTION
    • F23N5/00Systems for controlling combustion
    • F23N5/26Details
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23QIGNITION; EXTINGUISHING-DEVICES
    • F23Q9/00Pilot flame igniters
    • F23Q9/02Pilot flame igniters without interlock with main fuel supply
    • F23Q9/04Pilot flame igniters without interlock with main fuel supply for upright burners, e.g. gas-cooker burners
    • F23Q9/045Structurally associated with a main-burner
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23DBURNERS
    • F23D2205/00Assemblies of two or more burners, irrespective of fuel type

Abstract

The invention relates to a device (1) for operating a flame, comprising at least one feed line (2) for at least one oxidizing agent, in particular gaseous, and at least one combustible material, in particular a combustible gas, a burner for burning the same and a sound system (4) which can set the oxidizing agent in vibration. According to the invention, the burner comprises at least one control area for guiding the oxidizing agent set in vibration and the combustible material for generating a pilot flame (6) and at least one main area for at least one main flame (8), the control area with the sound system (4 ) is connected and a further oxidizing agent and a further combustible material can be carried in the main area. The invention further relates to the use of such a device (1). Furthermore, the invention relates to a method for operating a flame, wherein at least one, in particular gaseous, oxidizing agent and at least one combustible material, in particular a combustible gas, are led to a burner, the oxidizing agent being set in vibration by a sound system (4), whereby it is provided that the oxidizing agent is brought together with the combustible material and the combustible material is burned, a further combustible material being burned at a distance therefrom with the supply of a further oxidizing agent.

Description

description

DEVICE AND METHOD FOR OPERATING A FLAME The invention relates to a device for operating a flame, comprising at least one feed line for at least one, in particular gaseous, oxidizing agent and at least one combustible material, in particular a combustible gas, a burner for burning the same and a sound system, with which the oxidizing agent can be set in vibration.

The invention further relates to the use of such a device.

In addition, the invention relates to a method for operating a flame, wherein at least one in particular gaseous oxidizing agent and at least one combustible material, in particular a combustible gas, are led to a burner, the oxidizing agent being set in vibration by a sound system.

In many combustion processes in industry and research, a high-energy flame is required, for example when burning biomass, in cement plants or in research laboratories. To generate such a flame, a lot of fuel is usually necessary, in particular fuel with a high calorific value. Due to the constantly increasing fuel prices, operating such a flame is very expensive. In addition, the environmental impact from high environmentally harmful emissions, in particular from CO 2 , is correspondingly high, the level of the emissions being strongly dependent on the turbulence of the flame which arises during combustion. If a flame moves turbulently, soot may rise and the flame will glow yellow. In such a state of the flame, the emission of environmentally harmful gases is maximal.

When operating a flame, care should therefore be taken that it burns as stably and without strong vibrations, on the one hand to keep emissions low and on the other hand to ensure the most uniform possible heat or energy output. To do this, however, it may be necessary to keep the fuel supply constantly high, which in turn causes high costs.

Devices are known from the prior art with which instabilities of a flame can be reduced. The flame or a gas mixture to be burned is acoustically modulated, whereby a flame burns in a controllable manner and turbulence can be restricted at a correspondingly selected frequency. Although this can reduce emissions of environmentally harmful gases at a suitable frequency, the need for expensive fuel is still high.

When examining the combustion properties of one or more flames and their combustion turbulence, it was discovered by chance within the scope of the invention that a flame which carries out vibrations pulls adjacent flames or their turbulence and vibrations are transmitted to them.

The object of the invention is to provide a device of the type mentioned, with which a flame can be operated efficiently and inexpensively using this accidentally discovered effect.

It is also an object of the invention to provide a use of such a device.

Another object of the invention is to provide a method of the type mentioned, with which a flame can be operated efficiently and inexpensively using this accidentally discovered effect.

The first object is achieved according to the invention in that, in a device of the type mentioned at the outset, the burner has at least one control area for guiding the oxidizing agent which is set in vibration and the combustible material for producing a / 15

AT 516 424 B1 2020-04-15 Austrian patent office

Pilot flame and at least one main area for at least one main flame, wherein the control area is connected to the sound system and wherein further oxidizing agent and a further combustible material can be guided in the main area.

An advantage achieved with the invention can be seen in particular in the fact that, by spatially separating the control area from the main area, only this part of the oxidizing agent which generates the pilot flame can be set in vibration. The pilot flame generated by burning the combustible material burns quietly, spatially closely and, if possible, without unwanted or uncontrollable turbulence. The pulsed pilot flame also has a high energy density and high reaction rate, which accelerates a combustion process. Only little combustible material is carried in the control area, which means that costs can be reduced. The public address system can also be made smaller in comparison to the prior art, as a result of which further costs can be saved. Due to the spatial separation of the control area from the main area, it is possible in the device according to the invention to carry a different combustible material and / or a different oxidizing agent. As a rule, however, the same oxidizing agent is carried in the control area and in the main area, for example air. According to the invention, however, different oxidizing agents can also be provided in each case. Mixing of the reactants is optimized by a device according to the invention, in particular by the oxidizing agent set in vibration. According to the invention, the vibrations of the pilot flame or support flame are transmitted to the at least one main flame, so that this too burns stably and as far as possible without unwanted turbulence. The pilot flame can preferably be operated at about a tenth of the power of the main flame.

Advantageously, the sound system is designed such that a frequency and / or an amplitude of the oscillating oxidizing agent can be determined with this and these can be transferred to the resulting pilot flame when the combustible material is burned by the oxidizing agent. The frequency and / or amplitude can be set in accordance with a desired pulsation of the flames. Several frequencies or a frequency range can prove to be favorable. The sound system can be designed as a siren, which is mounted in a housing that can withstand high pressures, e.g. up to 10 bar and more. According to the invention, the siren can comprise a gearwheel which can be driven by a shaft via an electric motor. The oxidizing agent flows through a supersonic nozzle to the gearwheel, which cuts the oxidizing agent, which is in particular gaseous, and thereby induces a frequency and / or an amplitude. The frequency and / or the amplitude of the oxidizing agent can be determined by varying a number of the teeth of the gear, a size and / or a speed of the gear. The oxidizing agent is thus subjected to sound and vibrates with a predetermined frequency and / or amplitude. A siren designed in this way has the advantage that it works perfectly even under high pressure or temperature conditions. In addition, it is also resistant to dirt and corrosion, which is why aggressive gases can also be passed through it. When the combustible material is burned, this frequency and / or amplitude can be transmitted to the pilot flame which arises, it being possible for the sound system to react immediately to any turbulence in the flame that may occur. In particular, the frequency is chosen so that a pulsed and uniform burning of the pilot flame is made possible, the frequency also being dependent on a volume of the different areas of the device. As an alternative to the siren, the sonication device can also be designed as a loudspeaker or other sonication means, a siren being particularly well suited for industrial applications due to the advantages mentioned above.

Advantageously, at least one nozzle is further arranged in the control area, through which a mixture of the oxidizing agent and the combustible material can be passed in order to burn the combustible material in the area of the nozzle as a pilot flame, the nozzle being designed such that a speed the mixture at an outlet is at least twice as fast as at an inlet thereof, in particular more than four times as fast

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AT 516 424 B1 2020-04-15 Austrian patent office quickly. The nozzle can be designed such that its cross-section is larger at the entrance than at the exit. It can be advantageous if this is approximately twice as large in order to avoid kickback of the pilot flame or main flame. The nozzle is thus designed similar to a Venturi nozzle and a pressure loss of the mixture is kept as low as possible. The nozzle is designed to be acoustically transparent, which means that sound waves pass through them without any attenuation, and the nozzle itself causes hardly any noise. The pilot flame burns in the area of this nozzle and vibrates with the frequency and / or the amplitude which is induced by the oxidizing agent. In addition, it can be provided according to the invention that the nozzle is designed with a vortex generator, so that an angular momentum is induced in the mixture by the nozzle in order to generate the flame at a distance from the nozzle. Little heat is transferred to the nozzle or a plate on which the nozzle is arranged, as a result of which thermal stress on the nozzle is kept low and its service life is extended. The spacing of the flame from the nozzle also ensures that it burns more robustly and cannot be easily extinguished. Furthermore, the spaced-apart operation of the flame has the advantage that a flame front is flat and its modulation is constant and uniform. A corresponding nozzle ensures that a ratio between the direction of flow and the flow velocity of the mixture through the nozzle is optimized. The simultaneous design of the nozzle as a Venturi nozzle and vortex generator makes it very efficient and at the same time inexpensive to manufacture.

It is preferably provided that at least one further nozzle is arranged in the main area, through which a mixture of the further combustible material and further oxidizing agent can be passed to the further combustible material in the area of the at least one further nozzle as one, in particular several, Burn main flames. A plurality of nozzles can preferably be provided, which are arranged around the nozzle of the control area. In particular, nine or more nozzles arranged in a grid can be provided, the nozzle of the control region being arranged in the center. According to the invention, it is advantageous if the nozzles of the main area are constructed identically to the nozzle of the control area.

It may be advantageous if the nozzles are arranged at a distance from one another at a predetermined maximum distance at one end of the burner in order to enable the frequency and / or the amplitude of the pilot flame to be transmitted to the at least one main flame. The distance between the nozzles depends on how many nozzles are arranged and how large the flame that is to be produced during combustion should be. The material burning in the area of the nozzles of the main area can be a gas with a low calorific value, e.g. Biogas in a biogas combustion for disposal of the same. A frequency and / or an amplitude of the pilot flame or supporting flame is transmitted to the main flames with a correspondingly selected distance of the nozzles from the pilot flame and thus enables a gas with a very low calorific value to be burned and subsequently an effective generation of a flame which is low Consumption of fuel with a high calorific value is stable and burns without any unwanted turbulence if possible. This reduces costs on the one hand and reduces emissions that are harmful to the environment on the other. In addition, a conventional gas such as methane or butane can be carried in the main area. The pulsation of the pilot flame and the at least one main flame increases the efficiency of a flame or the same temperature of a flame can be achieved with less gas supply. Regardless of the combustible material being guided, the nozzles are arranged in such a way that the pilot flame ensures combustion or the existence of at least one main flame.

A device according to the invention is advantageously used when burning a gas with a low calorific value.

The further object is achieved in that in a method of the type mentioned, the oxidizing agent is combined with the combustible material and the combustible material is burned, with a further burning spaced therefrom

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AT 516 424 B1 2020-04-15 Austrian patent office burnable material with the addition of oxidizing agent.

In a method according to the invention, only a part of the oxidizing agent is subjected to sound, brought together with the combustible material and the combustible material is burned. The further combustible material and the further oxidizing agent are guided at a distance from the oxidizing agent subjected to sound and are burned at the same time. The oxidizing agent is preferably set in motion by a sonication device designed as a siren and further combined with the combustible material which is burned. A spaced arrangement of two combustible materials according to the invention thus allows two different combustible materials to be carried, for example one combustible gas with a high calorific value and one with a low calorific value. However, it can also be provided that the same combustible material is carried in each case. As a rule, the same oxidizing agent is carried or used, for. B. air. However, two different oxidizing agents can also be used.

It is advantageously provided that mixtures of oxidizing agents and combustible materials are led to the outside via nozzles, with a combustible material in at least one control area in the area of a nozzle as a pilot flame and another combustible material in at least one main area in the area of at least one , in particular several, further nozzles is burned as the main flame. The pilot flame can preferably be operated at about a tenth of the power of the main flame, which saves energy. According to the invention, it can be provided that conventional combustible material is burned in the control area, such as methane or butane. In contrast, it can be provided that a gas with a low calorific value is burned in the main area. A gas with a low calorific value is less expensive than a conventional combustible gas and thus reduces the costs involved in a method for producing a flame. However, a conventional gas can also be conducted in the main area. In the case of a main flame which arises as a result, an energy supply necessary to achieve a desired temperature of the main flame can be reduced due to the pulsation thereof in comparison with the prior art.

It is advantageous if a frequency and / or an amplitude of the sound system are recorded by the mixture in the control area and transmitted to the pilot flame and from there to the main flame. The frequency and / or amplitude can be selected in accordance with the desired pulsation of the flames. Several frequencies or even a frequency range can prove to be favorable. In general, the lower the frequency, the more turbulent the combustion. To generate the at least one main flame, a gas with a low calorific value can be burned, as a result of which the energy to be expended is reduced. By sonicating the pilot flame and transmitting this frequency and / or amplitude to the main flame, a gas with a low calorific value can easily be burned and a robust flame can be generated which is resistant to its extinguishing. For this purpose, the nozzles can preferably be arranged at a distance from one another, the distance being predetermined such that the vibrations of the pilot flame are absorbed by the main flame or flames.

Advantageously, it can further be provided that the flame is induced by the nozzles an angular momentum, the flame being composed of the pilot flame and at least one main flame. The pilot flame and the at least one main flame spaced apart from the respective nozzles are generated by the induced angular momentum, so that heat conduction or heat transfer to the nozzles or a plate on which the nozzles can be arranged is kept under control. In addition, a flame with a flat flame front is generated. The modulation of the oxidizing agent can be transferred to the pilot flame as far as possible and subsequently to the main flame, since the nozzles are acoustically transparent.

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AT 516 424 B1 2020-04-15 Austrian Patent Office [0023] Further features, advantages and effects result from the exemplary embodiments presented below. In the drawings, to which reference is made, show:

Figure 1, Figure 2, Figure 3, Figure 4, Figure 5, Figure 6, Figure 7, Figure 8, and Figure 8 9 [0033] FIG. 10 shows a device according to the invention;

a section through an inventive device according to Figure 1 along the line II-ll.

another device according to the invention;

a nozzle;

a section through the nozzle along the line V-V in Fig. 4;

a bottom view of a nozzle;

a burner with nozzles in plan view;

another burner in plan view;

a schematic representation of a device according to the invention for explaining a method according to the invention;

is a schematic representation of a nozzle to explain a method according to the invention.

1 shows a device 1 according to the invention for operating a flame. The device 1 comprises at least one feed line 2 for at least one oxidizing agent, in particular gaseous, and at least one combustible material, in particular a combustible gas. The oxidizing agent and the gas can be fed to a burner 3 via a feed line 2 (not shown in FIG. 1), a sound system 4 being provided upstream of this, with which the oxidizing agent can be set in motion before being fed to the burner 3. The sound system 4 can be designed as a siren, which is mounted in a housing that can withstand high pressures. According to the invention, the siren can comprise a gearwheel which is driven by an electric motor with a shaft. The gaseous oxidizing agent flows through a critical nozzle or Laval nozzle to the gearwheel, which cuts it and thereby induces a frequency and / or an amplitude. The frequency and / or the amplitude of the oxidizing agent can be determined by varying a size, a number of teeth of the gear wheel and / or a speed of the gear wheel. As an alternative to the siren, the sound system 4 can also be designed as a loudspeaker or other sound system.

A control area 5 is provided for the first oxidizing agent and the combustible material, in which the combustible material burns with the release of a pilot flame 6. The pilot flame 6 is not shown in FIG. 1, since this can be arranged within a protective cover 10 for safety-related reasons. Further oxidizing agent and a further gas can be fed to the burner 3 in a vibration-free manner via at least one further feed line 2. A main area 7 is provided in which the further gas can be combusted as at least one, preferably a plurality of, main flames 8 by being combined with the further oxidizing agent. The main flames 8 are also spaced apart from the pilot flame 6 within the protective cover 10 and are therefore not shown in FIG. 1. The protective cover 10 can include at least one window for observing the flame, the window z. B. of quartz glass and the protective cover 10 z. B. can be formed from a steel.

FIG. 2 shows a section through a device 1 according to the invention according to FIG. 1 along the line II-II. The pilot flame 6 and main flames 8 as well as the control area 5 and the main area 7 are now shown here. The control area 5 is arranged approximately centrally in the burner 3 and the main area 7 around it. In the control area 5, the oxidizing agent to which sound is applied can be combined with the gas and the gas can be combusted, the sound system 4 not being shown. The part of that shown in Fig. 2

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AT 516 424 B1 2020-04-15 Austrian patent office

Device 1 comprises three resonance bodies 11a, 11b, 11c, with which several resonance modes can be excited, wherein the resonance bodies 11a, 11b, 11c can function like Helmholtz resonators.

Fig. 3 shows a further device 1 according to the invention without a protective cover 10. The pilot flame 6 is arranged at an upper end of the burner 3 and surrounded by eight main flames 8. The respective mixtures of oxidizing agent and gas can be led to the outside via nozzles 9 and the gas burns in the area of the nozzles 9, the nozzles 9 being arranged on a plate 12. The burner 3 is designed as a two-stage burner 3 by the control area 5 and the main area 7. According to the invention, however, a burner 3 can also be provided, which comprises three, four or more stages.

4, 5 and 6 show three views of a nozzle 9 as used in a device 1, in particular in the control area 5. FIG. 5 shows a section along the line VV of the nozzle 9 from FIG. 4. FIG. 6 shows a bottom view of a nozzle 9 or a nozzle 9 in the direction of flow of a mixture of oxidizing agent and combustible material. A lower cross-sectional area of the nozzle 9 is larger, preferably four times as large as an upper cross-sectional area, in order to increase an exit velocity of the mixture. The combustible material or gas can be supplied to the oxidizing agent via a pipe 13. The tube 13 is arranged approximately in the middle of the nozzle and held in position by in particular three fastening means such as screws. In order to maximize the high speed of the material guided therein, the tube 13 can be designed with a small free diameter, preferably less than 1.5 mm, in particular approximately 0.8 mm. 4 and 5, the constriction 14 of the nozzle 9 functions like a Venturi nozzle; dynamic pressure becomes maximum and static pressure minimum. The dimensions of the nozzle 9 can be adapted to a type and amount of the combustible material and can thus be dimensioned significantly larger than indicated above, for example for guiding a gas with a low calorific value. It can be favorable for this that the nozzle 9 is dimensioned such that a speed of the combustible material is significantly higher than a corresponding one of the oxidizing agent. In general, the free diameter of the tube 13 appears to be essential when adapting the nozzle 9 to the type or amount of the gas to be burned. The remaining dimensions are scaled accordingly. FIG. 6 further shows that an upper section 15 of the nozzle 9 is cut through along its longitudinal axis to a predetermined point and the two parts resulting from this are arranged offset to one another. The upper end of the nozzle 9 is not cut through. According to the invention, the two parts of the upper section 15 of the nozzle 9 can preferably be arranged offset from one another such that respective ends are arranged in the middle of a respective diameter. This produces a vortex generator or vortex generator, by means of which an angular momentum can be induced in the resulting flame and with which a pressure loss of the gas to be burned is kept as low as possible. The tube 13 is arranged at the beginning of the constriction 14 or when the cross-section changes, spaced apart in the middle of the upper section 15, a distance between the tube 13 and the upper section 15 being approximately 3 mm to 6 mm, preferably 4 mm to 5 mm. The distance is in turn dependent on the type and amount of the combustible material and thus on the size of the nozzle 9 or the burner 3 and can therefore also be significantly larger or smaller. In general, this can correspond to approximately half the free diameter of the tube 13. A construction or manufacture of such a nozzle 9 is inexpensive compared to the manufacture of a conventional nozzle. In addition, this is very efficient due to its simultaneous training as a Venturi nozzle and vortex generator.

7 and 8 each show a variant of a burner 3 or the plate 12 with the nozzles 9 arranged thereon in a top view. In Fig. 7, nine nozzles 9 are offset from one another approximately flush with the plate 12. A distance between the individual nozzles 9 is dependent on the size of the burner 3 and the nozzles 9 themselves. According to the invention, a distance between the nozzles 9 is selected such that vibrations of the pilot flame 6 can be transferred to the main flame 8. It can be provided that all the nozzles 9 correspond to FIGS. 4, 5

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AT 516 424 B1 2020-04-15 Austrian patent office and 6 of identical construction. Alternatively, the nozzles 9 of the main area 7 can also be designed as a tube with an open end. 8, a central nozzle 9 in the control area 5 for the pilot flame 6 is arranged centrally on the plate 12. Around this nozzle 9 in the main area 7 slot openings 16 are provided for the main flame 8. Here, too, a distance between the nozzle 9 and the slot openings 16 is predetermined in order to ensure transmission of the vibrations from the pilot flame 6 to the main flame 8.

In a method according to the invention for operating a flame, as shown in FIG. 9, the first oxidizing agent is passed through the sound system 4 via the feed line 2 and thereby caused to vibrate. The oxidizing agent is then brought together in the control region 5 with the gas to be burned, to which a frequency and / or an amplitude of the oxidizing agent are transmitted. The supply of the gas to be burned is shown in FIG. 9 as an arrow in the control area 5. This resulting mixture is passed through the nozzle 9 of the control area 5 and the gas is burned in the area of this as a pilot flame 6. A selection of the frequency or the amplitude is chosen in such a way that the pilot flame 6 can oscillate evenly. The frequency or amplitude of the mixture is transmitted to the pilot flame 6 and this oscillates. For example, methane or butane can be burned as gas. As shown in FIG. 10, the nozzle 9 is designed such that a speed of the mixture at the end of the mixture is preferably at least four times as fast as at the beginning. For this purpose, an end-side diameter of the nozzle 9 can be made smaller than an inlet-side diameter, in particular an inlet-side diameter can be approximately twice as large in cross-section as an end-side diameter. This prevents the pilot flame 6 and the main flame 8 from kicking back because they are spin-stabilized. The gas to be burned is fed via the pipe 13 into the nozzle 9, while the oxidizing agent is fed into the pipe 13 outside the latter. The supply and a further guide course of the gas to be burned are represented by arrows in FIG. 10. By designing the nozzle 9 as a Venturi nozzle or through the constriction 14, there is a jam at the end of the nozzle 9 outside the upper section 15, as a result of which the gas to be burned is forced to enter the upper section 15 of the nozzle 9 and to deal with it Mix oxidizing agent. Thus, a pressure loss within the nozzle 9 remains as low as possible and the flow is not blocked. In addition, deposits are largely avoided in the case of an impure flow. This also makes the nozzle 9 acoustically transparent, as a result of which sound waves are neither absorbed nor caused in the entire burner 3. Furthermore, the nozzle 9 is designed such that an angular momentum is induced to the pilot flame 6 in order to space the pilot flame 6 from the nozzle 9 or the plate 12. For this purpose, the gas to be burned is brought together with the oxidizing agent in the upper section 15. This upper section 15, which is designed as a vortex generator, lifts a flame that is produced from the nozzle 9. In the control area 5, the material to be burned is usually mixed with the oxidizing agent before being fed to the nozzle 9, as shown in FIG. 9.

A further oxidizing agent can be passed to the burner 3 (not shown in FIG. 9) via at least one additional feed line 2. The further oxidizing agent is fed directly into a plenum 17 without passing through the sound system 4. The plenum 17 can be used as a resonance body 11c. This is brought together in main area 7, not shown in FIG. 9, with a further combustible material, which is preferably burned as a plurality of main flames 8. The supply of the further combustible material is also indicated in FIG. 9 with two arrows, which are arranged outside the control area 5. This mixture is also led to the outside via nozzles 9. The nozzles 9 can preferably be constructed identically to the nozzle 9 of the control area 5, the functioning of which is explained with reference to FIG. 10. According to the invention, it can be provided that the nozzles 9 are arranged at a distance from one another, so that the frequency and / or the amplitude of the pilot flame 6 are transmitted to the at least one main flame 8. As an alternative, the further mixture can be passed out through the slot openings 16 in the plate 12 instead of via the nozzles 9 and the gas can be burned. The main flames 8 thus absorb the vibration of the pilot flame 6 and vibrate at the same frequency and / or

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AT 516 424 B1 2020-04-15 Austrian patent office

Amplitude like this.

It can be provided that a gas with a low calorific value is guided in the main area 7. By impinging sound on the pilot flame 6 and transmitting this pulsation to the main flames 8, gases with a low calorific value can be burned and the resulting flame can be kept stable without extinguishing. Instead of the gas with a low calorific value, a conventional gas such as methane or butane can also be conducted in the main area 7 according to the invention. When such a gas is burned, the pulsation increases the thermal efficiency of the combustion.

The device 1 according to the invention and the method according to the invention can thus, among other things, when burning biogas, for energy generation or also for flame cutting of z. B. steel are used or applied.

Claims (8)

Claims
1. A device (1) for operating a flame, comprising at least one feed line (2) for at least one in particular gaseous oxidizing agent and at least one combustible material, in particular a combustible gas, a burner (3) for burning the same and a sound system (4), with which the oxidizing agent can be vibrated, the burner (3) having at least one control area (5) for guiding the oxidizing agent which has been vibrated and the combustible material for producing a pilot flame (6) and at least one main area (7) for at least one main flame (8), wherein the control area (5) is connected to the sound system (4) and wherein further oxidizing agent and another combustible material can be carried in the main area (7), characterized in that at least one nozzle (9 ) is arranged, through which a mixture of the oxidizing agent and the combustible material can be passed to to burn the combustible material in the area of the nozzle (9) as a pilot flame (6), the nozzle (9) being designed in such a way that the speed of the mixture at an outlet thereof is at least twice as fast as at an inlet thereof, in particular more than four times as fast.
2. Device (1) according to claim 1, characterized in that the sound system (4) is designed such that with it a frequency and / or an amplitude of the vibrating oxidizing agent can be determined and this when the combustible material is burned by the oxidizing agent can be transferred to the resulting pilot flame (6).
3. Device (1) according to claim 1 or 2, characterized in that in the main area (7) at least one further nozzle (9) is arranged, through which a mixture of the further combustible material and further oxidizing agent can be passed to the further combustible material to burn as one, in particular several, main flames (8) in the area of the at least one further nozzle (9).
4. The device (1) according to claim 3, characterized in that the nozzles (9) are arranged at one end of the burner (3) at a predetermined maximum distance from one another in order to transmit the frequency and / or the amplitude of the pilot flame (6 ) on the at least one main flame (8).
5. Use of a device (1) according to one of claims 1 to 4 for burning a gas with a low calorific value such as biogas.
6. A method of operating a flame, wherein at least one in particular gaseous oxidizing agent and at least one combustible material, in particular a combustible gas, are led to a burner (3), the oxidizing agent being set in vibration by a sound system (4), the Oxidizing agent merged with the combustible material and the combustible material is burned, a further combustible material being burned at a distance from the supply of oxidizing agent, characterized in that mixtures of oxidizing agent and combustible materials are led outside via nozzles (9), a combustible one Material in at least one control area (5) in the area of a nozzle (9) as a pilot flame (6) and a further combustible material in at least one main area (7) in the area of at least one, in particular several, further nozzles (9) as the main flame (8 ) is burned.
7. The method according to claim 6, characterized in that a frequency and / or an amplitude of the sound system (4) from the mixture in the control area (5) is recorded and transmitted to the pilot flame (6) and from there to the main flame (8) .
9/15
AT 516 424 B1 2020-04-15 Austrian patent office
8. The method according to claim 6 or 7, characterized in that the flame is induced by the nozzles (9) an angular momentum, the flame being composed of the pilot flame (6) and at least one main flame (8).
ATA50772/2014A 2014-10-27 2014-10-27 Device and method for operating a flame AT516424B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19641843A1 (en) * 1995-10-13 1997-04-17 Us Energy Stabilization of pressure vibrations in combustion devices and methods therefor
DE19636093A1 (en) * 1996-09-05 1998-03-12 Siemens Ag Method and device for acoustic modulation of a flame generated by a hybrid burner
DE102008006607A1 (en) * 2008-01-30 2009-08-06 Ibu-Tec Advanced Materials Ag Process for the preparation of finely divided particles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19641843A1 (en) * 1995-10-13 1997-04-17 Us Energy Stabilization of pressure vibrations in combustion devices and methods therefor
DE19636093A1 (en) * 1996-09-05 1998-03-12 Siemens Ag Method and device for acoustic modulation of a flame generated by a hybrid burner
DE102008006607A1 (en) * 2008-01-30 2009-08-06 Ibu-Tec Advanced Materials Ag Process for the preparation of finely divided particles

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