# US 10,077,407 B2 · Method and system for recycling carbon dioxide from biomass gasification > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,077,407 B2 - Document ID: US10077407B2 - Status: Granted - Kind: B2 - Application number: 15/261,988 - Filed: 2016-09-11 - Published: 2016-12-29 - Granted: 2018-09-18 - Earliest claimed: 2012-08-09 - Assignees: Wuhan Kaidi Engineering Technology Research Institute Co., Ltd. - Applicants: Wuhan Kaidi Engineering Technology Research Institute Co., Ltd. - Inventors: Yanfeng Zhang; Liang Zhang; Minggui Xia; Wenyan Liu - Web page: https://patentgrep.com/patent/US10077407B2 ## CPC - C10J 3/82: Gas withdrawal means - C10G 2/32: {with the use of catalysts} - C10G 2/34: {Apparatus, reactors} - C10J 3/482: {Gasifiers with stationary fluidised bed} - C10J 3/72: Other features - C10K 1/004: {Sulfur containing contaminants, e.g. hydrogen sulfide} - C10K 1/02: Dust removal - C10K 1/026: {by centrifugal forces (cyclones B04C)} - C10K 1/08: by washing with liquids; Reviving the used wash liquors (gas washers B01D) - C10K 3/04: reducing the carbon monoxide content {, e.g. water-gas shift [WGS]} - C10G 2300/1011: Biomass - C10J 2200/15: Details of feeding means - C10J 2300/0916: Biomass - C10J 2300/0969: Carbon dioxide - C10J 2300/123: by electromagnetic waves, e.g. microwaves - C10J 2300/1238: by plasma - C10J 2300/1269: by radiating device, e.g. radiant tubes - C10J 2300/1292: mSolar energy - C10J 2300/1659: to liquid hydrocarbons - C10J 2300/1693: with storage facilities for intermediate, feed and/or product - C10J 2300/1815: for carbon dioxide - C10J 2300/1861: Heat exchange between at least two process streams - C10J 2300/1884: with one stream being synthesis gas - C10J 2300/1892: with one stream being water/steam - Y02E 50/30: Fuel from waste, e.g. synthetic alcohol or diesel - Y02P 20/129: Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines - Y02P 20/133: Renewable energy sources, e.g. sunlight - Y02P 20/145: the feedstock being materials of biological origin - Y02P 30/20: using bio-feedstock - C10J: PRODUCTION OF PRODUCER GAS, WATER-GAS, SYNTHESIS GAS FROM SOLID CARBONACEOUS MATERIAL, OR MIXTURES CONTAINING THESE GASES (synthesis gas from liquid or gaseous hydrocarbons C01B; underground gasification of minerals E21B43/295); CARBURETTING AIR OR OTHER GASES - C10G: CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION (cracking to hydrogen or synthesis gas C01B; cracking or pyrolysis of hydrocarbon gases to individual hydrocarbons or mixtures thereof of definite or specified constitution C07C; cracking to cokes C10B); RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES - C10K: PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A biomass gasification system. The system includes: a) a gasifier; b) a waste heat exchanger; c) a waste heat boiler; d) a cyclone separator; e) a gas scrubber; f) a shift reactor; g) a desulfurizing tower; h) a first decarburizing tower; i) a synthesizing tower; and j) a second decarburizing tower. In the system, the gasifier, the waste heat exchanger, the cyclone separator, the gas scrubber, the shift reactor, the desulfurizing tower, the first decarburizing tower, the synthesizing tower, and the second decarburizing tower are connected sequentially. In addition, CO2 outlets of the first decarburizing tower and the second decarburizing tower are both connected to a cold medium inlet of the waste heat exchanger; and a cold medium outlet of the waste heat exchanger is connected to a gasifying agent entrance of the gasifier. ## Claims ### Claim 1 A biomass gasification system, the system comprising: a) a gasifier; b) a waste heat exchanger; c) a waste heat boiler; d) a cyclone separator; e) a gas scrubber; f) a shift reactor; g) a desulfurizing tower; h) a first decarburizing tower; i) a synthesizing tower; and j) a second decarburizing tower; wherein: a syngas outlet of the gasifier is connected to a heat medium inlet of the waste heat exchanger; a heat medium outlet of the waste heat exchanger is connected to a heat source inlet of the waste heat boiler; a heat source outlet of the waste heat boiler is connected to a gas inlet of the cyclone separator; a gas outlet of the cyclone separator is connected to an inlet of the gas scrubber; an outlet of the gas scrubber is connected to a gas inlet of the shift reactor via a compressor; a vapor outlet of the waste heat boiler is connected to a vapor inlet of the shift reactor; a vapor outlet of the shift reactor is connected to an inlet of the desulfurizing tower, and an outlet of the desulfurizing tower is connected to an inlet of the first decarburizing tower which is configured for the decarburizing of the syngas; an outlet of the first decarburizing tower is connected to an inlet of the synthesizing tower; an exhaust outlet of the synthesizing tower is connected to an exhaust inlet of the second decarburizing tower which is configured for the decarburizing of the exhaust; CO2 outlets of the first decarburizing tower and the second decarburizing tower are both connected to a cold medium inlet of the waste heat exchanger; and a cold medium outlet of the waste heat exchanger is connected to a gasifying agent entrance of the gasifier. ### Claim 2 (depends on 1) The system of claim 1, wherein the CO2 outlets of the first decarburizing tower and the second decarburizing tower are both connected to an inlet of a gas holder, and an outlet of the gas holder is connected to the cold medium inlet of the waste heat exchanger via a blower. ### Claim 3 (depends on 2) The system of claim 2, wherein the inlet of the gas holder is also connected to a CO2 outlet of a calcinator. ### Claim 4 (depends on 1) The system of claim 1, wherein an air distributor is disposed in a lower part of a chamber of the gasifier; a wall of the gasifier above the air distributor comprises a primary gasifying agent entrance; the wall of the gasifier below the air distributor comprises an auxiliary gasifying agent entrance; an external energy entrance is disposed on the wall of the gasifier above the auxiliary gasifying agent entrance; and a cold medium outlet of the waste heat exchanger is connected to both the primary gasifying agent entrance and the auxiliary gasifying agent entrance. ### Claim 5 (depends on 3) The system of claim 3, wherein an air distributor is disposed in a lower part of a chamber of the gasifier; a wall of the gasifier above the air distributor comprises a primary gasifying agent entrance; the wall of the gasifier below the air distributor comprises an auxiliary gasifying agent entrance; an external energy entrance is disposed on the wall of the gasifier above the auxiliary gasifying agent entrance; and a cold medium outlet of the waste heat exchanger is connected to both the primary gasifying agent entrance and the auxiliary gasifying agent entrance.