To meet the requirements of the International Maritime Organization(IMO)energy efficiency design index(EEDI)in the 3rd phase,an onboard carbon capture system(OCCS)for liquefied natural gas(LNG)fuel ships is proposed.In OCCS,CO2 from the flue gas of main engine is enriched through the alcohol amine solution,and the waste heat from the flue gas of main engine is recovered for the alcohol amine solution regeneration.The desorbed CO2 is liquefied by utilizing the cold energy released during LNG gasification.Taking a Kamsarmax ship as an example,an OCCS model based on the comprehensive utilization of cold and heat energy is constructed.The effects of the flue gas mass flow rate,the solution mass flow rate and the lean solution temperature at the inlet of the absorber on CO2 capture amount and specific heat consumption are analyzed.The results show that:increasing the temperature of lean solution can effectively reduce the heat consumption,and the flue gas mass flow rate and the solution mass flow rate have a significant effect on the CO2 capture amount.When the solution mass flow rate is greater than 18 000 kg/h,the OCCS can meet the IMO requirements of CO2 emission reduction in the 3rd phase.The ship can meet the IMO EEDI requirements of the 3rd phase by the designed OCCS,and the specific heat consumption is within the range of 10.9 to 12.2 GJ/t.
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