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This paper evaluates steam cracker flue gas carbon capture using the example of mainly methane-fired cracking furnaces. The case of a worldâscale liquid cracker decarbonization is presented, where the CO2 from the flue gases is captured utilizing the OASE® blue process, which is mutually developed by BASF and Linde. It is demonstrated that the direct continuous CO2 emissions from the furnace and boiler stacks can be efficiently removed by more than 95%.
The paper further outlines how existing cracker assets can be retrofitted with appropriate ducting to collect and route the individual flue gases to the capture facility. Despite being an elegant âadd-onâ solution for retrofitting existing facilities with relatively low impact to the existing fired capital equipment, flue gas capture units consume a noticeable amount of low-temperature heat. Energy-integration potentials between cracker and flue gas capture unit are highlighted, mitigating or even avoiding extra thermal energy demand and associated extra CO2 generation.
Finally, cracker-specific system dynamics relevant to the flue gas carbon capture unit are analyzed and sound control strategies are revealed that ensure continued stable plant operation in dynamically changing scenarios.
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