A humidifier which comprises an inner case of the shape of a cylinder having a bottom, an outer case of cylindrical shape arranged to be concentric with the inner case, and a plurality of hollow fiber membranes being placed in the space between the two cas...

Production of hot working gases involves carrying out the combustion in a burner to produce a hot combustion waste gas for use as working gas; deviating a part of the combustion waste gas and feeding to an oxygen separating unit and enriching with oxygen b...