Patent ID: 8404909
Filing Date: 2013-03-26
Classification: B01D,C01B,C10B,Y02C,Y02E

Abstract:
1. A method for capturing carbon dioxide from the combustion of char produced in biomass pyrolysis, the method comprising the steps of: (a) pyrolyzing biomass in a pyrolysis reactor in the presence of heat energy carrier particles including metal oxide sorbents to produce char, pyrolysis oil vapors and metal oxide sorbents; (b) separating the pyrolysis oil vapors from the char and heat energy carrier particles and transferring the char and heat energy carrier particles to a char combustor; (c) combusting the char in the char combustor in the presence of oxidized metal oxide sorbents and producing a flue gas stream of carbon dioxide and water vapor and a stream of heat energy carrier particles including reduced metal oxide sorbents; (d) separating the flue gas stream from the stream of heat energy carrier particles including the reduced metal oxide sorbents; (e) separating the flue gas stream into carbon dioxide and water vapor and capturing a stream of carbon dioxide; (f) oxidizing a first portion of the stream of heat energy carrier particles including reduced metal oxide sorbents received from the char combustor in an oxidation reactor in the presence of air to produce a regenerated stream of heat energy carrier particles including oxidized metal oxide sorbents to be used in step (c); and (g) recycling to the pyrolysis reactor of step (a) a second portion of the stream of heat energy carrier particles including reduced metal oxide sorbents.