Patent ID: 7946337

Claim:
A heat exchanger comprising: a plurality of heat exchanger tubes for receiving a cooling fluid; a space around said plurality of heat exchanger tubes for receiving a gas to be cooled; and an ultrasonic device for vibrating at least a portion of the heat exchanger to remove built up accumulation on said plurality of heat exchanger tubes, said ultrasonic device being operable to vibrate said plurality of heat exchanger tubes while a working gas is flowing over said plurality of heat exchanger tubes, and said space being defined by a housing surrounding said plurality of said heat exchanger tubes, with said ultrasonic device mounted upon said housing, for cleaning said plurality of heat exchanger tubes; and a first working gas is passed over the plurality of heat exchanger tubes to be cooled, and a second working gas is passed over the plurality of heat exchanger tubes while the ultrasonic transducer is vibrating the plurality of heat exchanger tubes to remove pulverized solids removed from the first working gas.