Patent ID: 8882438
Filing Date: 2014-11-11
Classification: F01D,F01K,F02C,F05D

Abstract:
1. A method for power generation including a turboexpander with at least two expansion stages, the turboexpander being connected to a power generation unit, the method comprising: controlling (i) an angle of a first inlet guide vane in a first expansion stage of the turboexpander for maintaining an inlet pressure of the first expansion stage in a predetermined range, and (ii) an angle of a second inlet guide vane in a second expansion stage of the turboexpander for maintaining the inlet pressure at the first expansion stage in the predetermined range; varying the angle of the second inlet guide vane while maintaining fixed the angle of the first inlet guide vane; determining a power generated by the power generation unit for corresponding varying angles; determining a highest power of the power generated by the power generation unit and a corresponding angle of the second inlet guide vane; and adjusting the angle of the second inlet guide vane independent of the angle of the first inlet guide vane to achieve the highest power.