An improved portable, versatile, modular, above-ground system and process for generating combustion gases, principally nitrogen and carbon dioxide, and steam, for removing particulate matter and corrosive components from the combustion gases, and for injecting the purified nitrogen and CO.sub.2, and...http://www.google.de/patents/US4546829?utm_source=gb-gplus-sharePatent US4546829 - Enhanced oil recovery process
