NAVICKAS, Algirdas (S. Žukausko g. 27-19, Vilnius, LT-09119, LT)
JURĖNAS, Vytautas (P. Višinskio g. 17-2, Kaunas, LT-44151, LT)
MINCHENYA, Vladimir (Logoiskij trakt 2-16, Minsk, 1, 22007, BY)
SMIRNOV, Valerij (bul. Muliavicha 5-93, Minsk, 1, 22007, BY)
ASIMOV, Rustam (Nekrasova 33-115, Minsk, 22004, BY)
NAVICKAS, Algirdas (S. Žukausko g. 27-19, Vilnius, LT-09119, LT)
JURĖNAS, Vytautas (P. Višinskio g. 17-2, Kaunas, LT-44151, LT)
MINCHENYA, Vladimir (Logoiskij trakt 2-16, Minsk, 1, 22007, BY)
SMIRNOV, Valerij (bul. Muliavicha 5-93, Minsk, 1, 22007, BY)
ASIMOV, Rustam (Nekrasova 33-115, Minsk, 22004, BY)
| Claims of the invention 1. The ultrasonic burner consists of a cylindrical sleeve frame with fuel inlet channels, a fuel mixing chamber at one end of the frame, the acoustic vibration generator at the other end of the frame, a sleeve-shaped jet concentrically fitted inside the frame with one end directed at the fuel mixing chamber and the other equipped with an acoustic vibration generator, characterized in that its frame and jet generate and concentrate mechanical vibrations, their length is at least 3λ, where λ represents the length of longitudinal vibration waves of the frame and the jet and the inner partition of the frame usually has a screw channel. 2. The ultrasonic burner according to clause 1, characterized in that the excitation frequencies of the frame and the jet are equal or repeatable. 3. The ultrasonic burner according to clause 1, characterized in that the length of its fuel mixing chamber is λ/4, where λ represents the length of longitudinal vibration waves in the environment of the fuel mixing chamber. |
This invention is aimed at the heating industry. It may be used for preparing a mixture of liquid and gas fuel, and delivering it to the combustion chamber of heating or other systems.
The heating industry has acoustic burners consisting of a frame and a jet, which consists of ringed outer air inlet channel and ringed inside fuel mixture jet channel. The jet is of cylindrical shape, with two concentric channels; one of them is ringed. Flow accelerators are installed in a ringed channel and outer channel. The jet is equipped with an acoustic vibration generator with the openings on its head directed at the auxiliary resonation recess (see RU Patent No. 2044959, F 23 D 11/34, 1995)
The heating industry has a method of burning a liquid and gas mixture in a device made of a cylindrical frame, ultrasound generator (concentrically fitted at the rear of the frame), and solid fuel particles' inlet channel, whose outer walls form a ringed channel in relation to the frame. The central tube with the fuel inlet channel, equipped with a nozzle on its outlet, is installed on the longitudinal axis of the device.
The central tube is connected to a ringed chamber, whose walls form an acoustic generator with the nozzle at the outlet. The rear walls of the frame, solid fuel particles' inlet channel, ringed chamber, and nozzle form a parabola-shaped reflector
(see RU patent No. 1307155, F23C, 11/00, 1987).
The preparation of the fuel mixture in the described prototype is ineffective and of low quality, as the differently-sized solid fuel particles do not distribute equally in the air flow.
The objective of the invention is to increase the efficiency of the combustion process, i.e. increase the amount of heat achieved with less cost.
The objective of the invention is reached through specifics of design. The ultrasonic burner consists of a cylindrical, sleeve frame with fuel inlet channels, a fuel mixing chamber at one end of the frame, and the acoustic vibration generator at the other end of the frame. A sleeve-shaped jet is concentrically fitted inside the frame.
Its one end is directed to fuel mixing chamber, while the other is equipped with a generator of acoustic vibrations. The frame and the jet generate and concentrate mechanical vibrations; their length is at least 3λ, where λ represents the length of longitudinal vibration waves of the frame and the jet. The inner partition of the frame usually has a screw channel. The excitation frequencies of the frame and the jet are equal or repeatable, while the length of fuel mixing chamber is λ/4, where λ represents the length of longitudinal vibration waves in the environment of the mixing chamber.
The essence of the invention is described in a general drawing of the burner. The acoustic burner consists of a cylindrical, sleeve frame 1, fuel mixing chamber 2 at one end of the frame 1, and the acoustic vibration generator 3 at the other end of the frame 1. A sleeve-shaped jet 4 is concentrically fitted inside the frame 1. One end of the jet is directed to fuel mixing chamber 2, while the other is equipped with a generator of acoustic vibrations 3 and the fuel inlet channel 5. The frame 1 and the jet 4 generate and concentrate mechanical vibrations; and their length is at least 3λ, where λ represents the length of longitudinal vibration waves of the frame 1 and the jet 4 (λ is the length of acoustic vibration in a certain material). The excitation frequencies of the frame 1 and the jet 4 are equal or repeatable, while the length of fuel mixing chamber 2 is λ/4, where λ represents the length of longitudinal vibration waves in the environment of the mixing chamber 2. The screw channel 6, fitted on the internal surface of the frame 1, accelerates the flow of gas, its external part is equipped with gas inlet channels. Second acoustic vibrator 8 is installed at one end of the frame 1.
Operation of the acoustic burner Liquid fuel flows into fuel mixing chamber 2 through the fuel inlet channel 5 and the jet 4. Gas enters the fuel mixing chamber 2 through the gas inlet channel 7, installed on the external part of the frame 1, and the screw channel 6, which evenly distributes it and accelerates its entry to the fuel mixing chamber 2. When the acoustic vibrator 3 creates high frequency mechanical vibrations in the jet 4, liquid fuel is shaken into droplets and flows out as finely-dispersed vapour. The acoustic vibrator 8 is tightly fixed at the open end of the frame 1. The vibrations create an acoustic cavitation field inside the fuel mixing chamber 2. Its effect is to mix liquid fuel with gas. In order to reach general resonance frequency of the acoustic cavitation field, vibrations excited in the frame 1 and the jet 4 should be of the same frequency or repeatable. The length of the fuel mixing chamber 2 is λ 4. This allows maximum energy generation at the rear part of the frame 1 outlet. Flowing through the jet, the liquid fuel is affected by ultrasonic frequency mechanical vibrations. Passing the sequences of acoustic nodes and bulges, the liquid fuel heats up (as a result of the acoustic energy) and becomes a vapour, which is mixed with gas delivered through a gas inlet channel 7 and a screw channel 6, and increases the quality of the combustion process. The jet 4 shall be of at least 3λ length, since the energy is transmitted to the liquid through the bulges of an acoustic wave delivering the maximum amount of energy. The acoustic vibrator 8 creates ultrasonic frequency mechanical acoustic vibrations in frame 1; vibrations shake the fuel mixture into a vapour delivering maximum burning effect to the combustion chamber.
In comparison to the prototype, the combination of the structural elements creates the conditions (due to the acoustic cavitation process) for the preparation of a finely-dispersed fuel mixture that gives maximum combustion efficiency, i.e. greater amount of heat is achieved with less cost.