Patent ID: 7640739

Claim:
A device producing energy comprising: a dilute VOC gas stream selected from the group comprising straight chain hydrocarbons, branched hydrocarbons, aromatic hydrocarbons, oxygenated hydrocarbons and mixtures thereof; a concentrator having an adsorbing chamber where the dilute VOC gas stream is adsorbed on an adsorbent media and a desorbing chamber where the adsorbed VOC gas stream is desorbed by an inert sweep gas into a concentrated VOC fuel greater than 15,000 ppm; a second fuel; a controller controlling the proportion of the concentrated VOC fuel and the second fuel; a signal proportional to the amount of the concentrated VOC fuel supplied to the engine, wherein the controller varies the amount of the second fuel in response to the concentrated VOC fuel; and an engine producing energy, the engine having a fuel intake receiving the concentrated VOC fuel, whereby the engine operates by consuming a fuel mixture of the concentrated VOC fuel and the second fuel.