Patent ID: 8764857

Claim:
A downdraft gasifier system for producing a gaseous fuel from a carbonaceous material, the downdraft gasifier system comprising: a dryer module; a pyrolysis module fluidly connected to the dryer module; a reactor module fluidly connected to the pyrolysis module, the reactor module comprising an air path fluidly connecting an oxygen source to a reactor module interior, and a gaseous fuel outlet; an engine comprising an engine inlet and an exhaust outlet, and a heat exchanger system comprising: a first heat exchanger thermally coupled to and fluidly separated from the dryer module, the first heat exchanger fluidly coupled between the gaseous fuel outlet and the engine inlet; a second heat exchanger thermally coupled to and fluidly isolated from the pyrolysis module, fluidly coupled to the engine exhaust; and a third heat exchanger thermally coupled to and fluidly separated from the air path, the third heat exchanger fluidly coupled between the gaseous fuel outlet and the first heat exchanger.