Patent ID: 7585372

Claim:
A method of producing gas pressure pulses in a dust-deposit cleaning apparatus for cleaning dust deposits of a processing equipment, the method comprising: providing apparatus including a combustion chamber and an amplifying horn, wherein the combustion chamber has an elongated shape with first and second opposite end regions that terminate at first and second ends respectively of the combustion chamber, the first and second end regions taper toward the first and second ends respectively, and the amplifying horn is located at the second end of the combustion chamber, feeding a combustible gas and oxygen into the combustion chamber via at least one inlet at the first end of the combustion chamber to form a combustible gas mixture, igniting the gas mixture for generating a pressure pulse by symmetrically placed ignition means in an ignition zone in the first end region of the combustion chamber and spaced from the first end of the combustion chamber to generate an initial explosion which causes a pressure wave, which is reflected from the inner walls of the combustion chamber in the first end region to form a collision zone, in which the initial explosion is at least partially transformed into a detonation, and releasing the pressure pulse from the combustion chamber via an outlet at the second end of the combustion chamber and conducting the pressure pulse to the amplifying horn for creating an amplified pulse to impinge on the processing equipment to be cleaned, and wherein a combustion front generated by symmetric ignition of the combustible gas mixture is self-compressed by colliding at a point essentially along the central axis of the combustion chamber, and is compressed by reflection from the tapered first end region of the combustion chamber between the ignition zone and the first end of the combustion chamber, and the the combustion front is compressed by entering a compression zone formed by the taper of the second end region of the chamber.