Back to results
US 8,999,019 B2Granted
Process and system for gasification with in-situ tar removal
AssigneeTaylor Biomass Energy, LLC
InventorMark A. Paisley
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process and system for gasifying biomass or other carbonaceous feedstocks in an indirectly heated gasifier and provides a method for the elimination of condensable organic materials (tars) from the resulting product gas with an integrated tar removal step. More specifically, this tar removal step utilizes the circulating heat carrier to crack the organics and produce additional product gas. As a benefit of the above process, and because the heat carrier circulates through alternating steam and oxidizing zones in the process, deactivation of the cracking reactions is eliminated.
Claims39
A method for converting a synthesis gas containing hydrocarbons, the method comprising the steps of:
- providing both an indirectly heated gasification module for generating a synthesis gas and a condensable material from a carbonaceous fuel having contact with a catalytically active heat transfer material, and a combustion module for contributing to an operation temperature of said gasification module;
- separating said synthesis gas and said condensable material from char and said catalytically active heat transfer material;
- providing an in situ gas conditioning module for receiving said synthesis gas and said condensable material from said gasification module and for operating at said operation temperature;
- providing said combustion module with said char and said catalytically active heat transfer material, said combustion module consuming said char to contribute to heating said catalytically active heat transfer material;
- in said gas conditioning module, conditioning said synthesis gas and said condensable material by contacting with said catalytically active heat transfer material at said operation temperature to minimize a tar content therein;
- providing steam to said gas conditioning module and said gasification module;
- and
- circulating said catalytically active heat transfer material from said gasification module to said combustion module to said gas conditioning module then to said gasification module.
5 more elements
A system for gasification with in-situ conditioning, said system comprising:
- a gasification module for gasifying a biomass feedstock into a synthesis gas and a condensable material by contacting said biomass feedstock with a thermal transfer material;
- a combustion module for contributing to an operation temperature of said gasification module;
- and
- a gas conditioning module for receiving said synthesis gas and said condensable material from said gasification module and for conditioning said synthesis gas in an in situ circuit with said gasification module and said combustion module;
- wherein said synthesis gas and said condensable material are separated from char and said thermal transfer material;
- wherein said char and said transfer material are provided to said combustion module;
- and
- wherein said combustion module consumes said char to heat said thermal transfer material and circulates said heated thermal transfer material to said gas conditioning module before said thermal transfer material is circulated to said gasification module.
5 more elements
A system for converting a synthesis gas containing hydrocarbons, the system comprising:
- an indirectly heated gasification module means for generating a synthesis gas and a condensable material from a carbonaceous fuel, and a combustion module means for contributing to an operation temperature of said gasification module;
- in situ gas conditioning module means for receiving said synthesis gas and said condensable material from said gasification module and for operating at said operation temperature to separate said synthesis gas and said condensable material from a catalytically active heat transfer material;
- and
- in said gas conditioning module means, means for conditioning said synthesis gas and said condensable material by contact with said catalytically active heat transfer material at said operation temperature to minimize a tar content therein;
- wherein said char and said catalytically active heat transfer material are provided to said combustion module means;
- and
- wherein said combustion module means consumes said char to contribute to heating said catalytically active heat transfer material and circulates said heat transfer material to said in situ gas conditioning module means before said heat transfer material is circulated to said gasification module means.
4 more elements
An apparatus for treating waste by gasification, said apparatus comprising:
- a circulating fluidized bed gasifier module for receiving a heat transfer material from an in situ gas conditioning module and said gas conditioning module receiving a synthesis gas and a condensable material from said gasifier module and for operating at an operation temperature to condition said synthesis gas and said condensable material;
- and
- a combustion module for contributing to said operation temperature of said gasifier module wherein char and a catalytically active heat transfer material are provided to said combustion module;
- and wherein said combustion module consumes said char to contribute to heating said catalytically active heat transfer material and circulates said heat transfer material to said in situ gas conditioning module before said heat transfer material is circulated to said gasification module;
- wherein said gas conditioning module is in a gas communication with each respective said gasifier module and said combustion module, and
- wherein said gas conditioning module enables an in situ gas conditioning of said synthesis gas and said condensable material by contact with said heat transfer material at said operation temperature to minimize a tar content therein, said in situ conditioning including a cracking reaction and a shifting reaction.
3 more elements
An apparatus for conditioning a synthesis gas containing hydrocarbons, said apparatus comprising:
- an indirectly heated gasification module for generating a synthesis gas and a condensable material from a carbonaceous fuel;
- a combustion module for contributing to an operation temperature of said gasification module;
- and
- an in situ gas conditioning module for receiving said synthesis gas and said condensable material from said gasification module and for operating at said operation temperature to contribute to separating said synthesis gas and said condensable material from char and a catalytically active heat transfer material;
- wherein said combustion module consumes said char to heat said heat transfer material and circulates said heat transfer material to said in situ gas conditioning module before said heat transfer material is circulated to said gasification module means;
- and
- wherein said conditioning module includes a module for conditioning said synthesis gas and said condensable material by contact with said catalytically active heat transfer material at said operation temperature to minimize a tar content therein, said conditioning module comprising a system for cracking said hydrocarbons and shifting said synthesis gas, thereby producing a conditioned gas containing a hydrogen:carbon monoxide ratio having a positive hydrogen balance.
4 more elements
Dependencies are inferred from the claim text.