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1. WO2020135969 - A BIOMASS GASIFICATION SYSTEM

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[ EN ]

CLAIMS

1. A biomass gasification system comprising:

a biomass gasification reactor having at least one fuel-inlet for injecting carbonaceous fuel and oxidant into said gasification reactor whereby, in a thermo-chemical reaction, synthesis gas is generated, said synthesis gas having a solid particle content and a tar content;

wherein said gasification reactor further has a syngas exit pipe via which said synthesis gas is extracted from the gasification reactor, and wherein said thermo-chemical reaction in the gasification reactor further also generates hot biochar;

a wet gas cleaning device for receiving the synthesis gas from said syngas exit pipe, said wet gas cleaning device being arranged to direct the synthesis gas through a water mist in order to remove tar from said synthesis gas thereby generating a tar-and-water liquid reject;

a mixer for receiving the hot biochar from the gasification reactor and mixing it with water thereby generating a biochar-and-water mixture;

a separator device for separating said tar-and-water liquid reject into a tar stream and first water stream;

means for conveying said first water stream from said separator device to said mixer thereby exposing any remaining tars in said first water stream to the biochar whereby such tars are fixed to the biochar surface resulting in a cleaning of said first water stream.

2. The gasification system according to claim 1 , wherein said separator device for separating said tar-and-water liquid reject is a sedimentation vessel, centrifuge or a filter, preferably a sedimentation vessel.

3. The gasification system according to claim 1 , wherein said mixer comprises a second separator device for providing a biochar-and-water liquid reject and a dewatered biochar.

4. The gasification system according to claim 1 , wherein said carbonaceous fuel has a particle size of max 3 mm and wherein said biomass gasification reactor is adapted to accept fuel with such small particle size, thereby providing a correspondingly finely divided biochar for cleaning of said first water stream.

5. The gasification system according to claim 3, wherein said separator device for providing a biochar-and-water liquid reject is a filter or a sedimentation vessel, preferably a filter.

6. The gasification system according to claim 3, wherein said mixer comprises a device for separating said tar-and-water liquid reject, preferably a sedimentation vessel.

7. The gasification system according to claim 3, wherein said mixer comprises an inlet to enable the tar-containing first water stream to encounter dewatered biochar

8. The gasification system according to claim 1 , wherein said wet gas cleaning device is a quencher.

9. A method for gasifying carbonaceous material comprising:

injecting a carbonaceous fuel and oxidant into a gasification reactor whereby, in a thermo-chemical reaction, synthesis gas having tar and a solid particle content is generated and also at the same time, biochar is generated; extracting said synthesis gas from said gasification reactor;

cooling and scrubbing said synthesis gas such that a tar-and-water liquid reject is formed;

separating said tar-and-water liquid reject into a tar stream and a first water stream;

conveying said first water stream and exposing any remaining tars in said first water stream to the biochar whereby such tars are fixed to the biochar surface resulting in a cleaning of said first water stream.

10. The method according to claim 9 wherein said biochar is mixed with water creating a biochar and water mixture, whereupon said biochar is separated from said biochar and water mixture, providing a dewatered biochar, and exposing said remaining tars with said dewatered biochar.

1 1. Use a system according to any one of the preceding claims 1 - 8, for minimizing usage of water at the same time enabling biochar to adsorb tar.