Patent ID: 6923004
Filing Date: 2005-08-02
Classification: C10J,C10K,F01K,F02C,Y02E,Y02P

Abstract:
1. A process for producing electricity from carbonaceous materials comprising the steps of: providing a fluidized bed containing a particulate material and a fluidizing medium, said fluidizing medium comprising steam; combusting a fuel source in a combustion device to form a combustion stream, said combustion stream indirectly heating said fluidized bed; feeding a carbonaceous material to said fluidized bed, said fluidized bed being at a temperature sufficient for said carbonaceous material to endothermically react with said steam to form a product gas stream; feeding said product gas stream to a gas turbine, said gas turbine combusting said product gas stream in order to rotate a turbine and generate electricity, said gas turbine producing a flue gas stream; combining an air stream with the product gas stream prior to combusting the product gas stream in the gas turbine, the air stream being preheated by the combustion stream exiting the combustion device; preheating at least a portion of the flue gas stream exiting the gas turbine by the combustion stream exiting the combustion device; and feeding at least a portion of said flue gas stream to said combustion device for combustion with said fuel source.