Abstract: A system for conversion of energy in a residual gas generated in an industrial process. The system includes a combustion chamber having a fuel inlet configured to receive a flow of residual gas for combustion in the combustion chamber. The combustion chamber further includes an air inlet. The system also includes a Stirling engine configured to convert heat from the combustion chamber into mechanical energy, the Stirling engine having a heat exchanger, wherein at least a portion of the heat exchanger extends into the combustion chamber. The system further includes a residual gas duct arranged for transporting the residual gas at atmospheric or near atmospheric pressure and an air duct arranged for transporting air at atmospheric or near atmospheric pressure.