Patent ID: 7744663
Filing Date: 2010-06-29
Classification: C01B,C10J,C10K,F23G,F23J,Y02E

Abstract:
1. A gasifier comprising: a shell comprising a gas output passage defined through a lower portion of said shell; a down flow combustor defined within said shell, said combustor comprising an inlet, an outlet, and a combustion zone extending between said inlet and said outlet, said combustor configured to direct a flow of process material comprising syngas, flowable slag, and particulates in a downward direction; a plurality of annular flow passages in serial flow communication and positioned substantially concentrically about said combustor, said plurality of passages comprising a first flow passage and a second flow passage, said first and second flow passages positioned in series between said combustor and said shell along a radius of said shell, wherein the process material flows in an upward direction through the first passage into the second passage; an up-flow passage defined at least partially between said shell and an outer wall of said second flow passage and oriented such that the process material flows in a downward direction through the second passage and into the up-flow passage; and a plurality of entrainment separation stages in serial flow communication with at least the second flow passage, at least one of said plurality of entrainment separation stages is positioned within said up-flow passage, at least one stage of said plurality of entrainment separation stages comprising a water trough at least partially circumscribing said shell between said second passage and said up-flow passage, said water trough having a bottom formed of a perforated plate and configured to maintain a level of water above said bottom, wherein substantially all the flow of process material from said second passage flows through perforations in said bottom and said level of water.