Combined absorption carbon dioxide trapping and compressing treatment technology

Abstract

The invention relates to a combined absorption carbon dioxide trapping and compressing treatment technology, and belongs to the field of decarburization and carbon dioxide emission reduction. A physical absorption method and a chemical absorption method are combined in the technology, and high pressure absorption-middle pressure desorption is carried out to realize high efficiency and low energy consumption decarburization. The technology comprises the following steps: carbon-containing airflow enters a physical trapping process and is desulfurized, the desulfurized airflow goes through a physical absorption tower and undergoes an affiliated process to remove most carbon dioxide, and the obtained airflow undergoes a chemical trapping process to remove residual carbon dioxide; a sulfur-containing rich solution undergoing desulphurization regeneration and a carbon-containing physical adsorbent-rich solution undergoing multistage flash evaporation generation respectively return to a physical absorption tower; a chemical adsorbent-rich solution undergoing thermal desorption regeneration returns to a chemical absorption tower; and carbon dioxide discharged from a flash evaporation tank and a desorption tower undergoes multi-stage compression to meet geological storage conditions. A heat exchanger is used in a technologic system to recover heat, and an expander is used to recover work. The combined absorption carbon dioxide trapping and compressing treatment technology has the advantages of high carbon trapping rate, low energy consumption, and suitableness for large-scale carbon trapping and compression treatment of high-pressure carbon dioxide-rich airflow.

Description

technical field [0001] The invention belongs to the technical field of decarbonization and carbon dioxide emission reduction, and is applicable to the decarbonization treatment of medium-high pressure carbon dioxide-rich gas flow in industrial processes, or carbon dioxide capture and carbon dioxide compression treatment for achieving storage conditions, and specifically relates to a combined absorption carbon dioxide capture Set with compression process. Background technique [0002] my country's coal-based energy structure will continue for a long time, and rapid economic development has resulted in a large amount of carbon dioxide (CO 2 )emission. To achieve sustainable economic development, it is urgent to promote CO 2 Development and application of capture and storage technologies. [0003] There are three main ways of carbon capture: pre-combustion carbon capture, oxyfuel combustion and post-combustion carbon capture. In terms of technology investment, carbon captur...

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