A dual-purpose combustor for ordinary combustion and pulse combustion especially suited to be installed for a spray dryer, which is used not only as an ordinary combustion gas generator but also as a pulse combustion gas generator capable of generating high frequency sound waves and hot blast in large...http://www.google.ca/patents/US5937539?utm_source=gb-gplus-sharePatent US5937539 - Dual-purpose combuster for ordinary combustion and pulse combustion
