US Patent 7469540 Energy recovery from waste heat sources

In some embodiments, three integrated phases may be used to reduce emissions, convert thermal energy into electricity, and cool inlet combustion air. An ammonia injection system may be designed to eliminate extraneous equipment and hazardous re-circulation lines by directly vaporizing, injecting, and mixing ammonia using a specially designed nozzle. The second phase may include using a preheat/vaporizer/superheater exchanger to convert ammonia liquid into a superheated vapor that is then passed through a turbo-expander/generator to produce power. In some embodiments, the third phase may include inlet combustion air chilling.