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CO2 emitted from ship exhaust is one of the major sources of atmospheric pollution.In order to reduce ship CO2 emissions,this paper comes up with the idea of recovering CO2 from ship exhaust by NaOH solution and improves the absorption rate by adding CaO solid particles.The effect mechanism of CaO solid particles on CO2 absorption efficiency is analyzed in detail,and the mathematical model is deduced and the CaO enhancement factor is calculated through experiments.Experiment result demonstrates that the effect of CaO solid particles on the absorption of CO2 in alkali solution is significant.The absorption rate of pure CO2 gas,the simulated ship exhaust gas and 6135AZG marine diesel engine emission can be increased by 10％,15.85％ and 10.30％,respectively.So it can be seen that CaO solid particles play an important role in improving the absorption efficiency of ship CO2 emission.