Method and system for recycling carbon dioxide from biomass gasification

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.