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US 12,569,801 B2Granted
Carbon dioxide capture apparatus and process combined with biogas upgrading
AssigneeAirrane Co., Ltd.
InventorsSeong Yong Ha, Sun Keun Lee, Kwang Joon Min, Chung Seop Lee, Jin Hyuk Yim, Dong Wook Kong, Eunbyeol Baek, Sang Hoon Han
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Abstract
The present disclosure relates to a carbon dioxide capture apparatus and process combined with biogas upgrading, and there is provided the carbon dioxide capture apparatus combined with biogas upgrading for simultaneously obtaining high purity methane and carbon dioxide, and improving separation efficiency without an additional process by making use of gas streams after a liquefaction process, and recovering cold heat in the process.
Claims15
A carbon dioxide capture apparatus combined with biogas upgrading, comprising:
- a first compressor configured to compress a first compressor feed gas including biogas;
- a first separation membrane configured to separate a first separation membrane feed gas including the gas compressed by the first compressor into a first separation membrane permeate gas and a first separation membrane residual gas;
- a second separation membrane configured to receive the first separation membrane residual gas and separate into a second separation membrane permeate gas and a second separation membrane residual gas;
- a third separation membrane configured to receive the first separation membrane permeate gas and separate into a third separation membrane permeate gas and a third separation membrane residual gas;
- a second compressor configured to compress a second compressor feed gas including the third separation membrane permeate gas;
- a liquefaction heat exchanger configured to cool down the gas compressed by the second compressor;
- a carbon dioxide purification unit including a separation tower which is supplied with the gas cooled by the liquefaction heat exchanger, and an upper part in which a carbon dioxide containing gas is obtained and a lower part in which a high purity carbon dioxide liquid is obtained;
- a first recovery separation membrane configured to receive the carbon dioxide containing gas and separate into a first recovery separation membrane permeate gas and a first recovery separation membrane residual gas;
- and
- a first circulation unit configured to circulate the first recovery separation membrane permeate gas to the first separation membrane, the third separation membrane or the second compressor.
7 more elements
A carbon dioxide capture process combined with biogas upgrading, comprising:
- a first compression step of compressing, by a first compressor, a first compressor feed gas including biogas;
- a first separation step of feeding the gas compressed by the first compressor into a first separation membrane to separate into a first separation membrane permeate gas and a first separation membrane residual gas;
- a second separation step of feeding the first separation membrane residual gas into a second separation membrane to separate into a second separation membrane permeate gas and a second separation membrane residual gas;
- a third separation step of feeding the first separation membrane permeate gas into a third separation membrane to separate into a third separation membrane permeate gas and a third separation membrane residual gas;
- a second compression step of compressing, by a second compressor, a second compressor feed gas including the third separation membrane permeate gas;
- a liquefaction step of cooling down, by a liquefaction heat exchanger, the gas compressed by the second compressor;
- a separation and purification step of feeding the gas cooled by the liquefaction heat exchanger into a separation tower to obtain a carbon dioxide containing gas in an upper part of the separation tower and recover a high purity carbon dioxide liquid in a lower part through a separation and purification process;
- and
- a first recovery step of feeding the carbon dioxide containing gas into a first recovery separation membrane to separate into a first recovery separation membrane permeate gas and a first recovery separation membrane residual gas, and circulating the first recovery separation membrane permeate gas to the first separation membrane, the third separation membrane or the second compressor.
6 more elements
Dependencies are inferred from the claim text.