Based on the data of 30000t/a CO2 capture & purification pilot scale test in Shengli power plant, the principle and method of CO2 compression and liquefaction were introduced, the calculation model of energy consumption for CO2 liquefaction process was built, the effection factors of CO2 purification power were analyzed, the ways to optimize energy saving were discussed. The results show that: (1) improving liquefaction pressure can effectively reduce the total power of CO2 compression and liquefaction, as the compression pressure increases, the compression power increases while the liquefaction power and total power reduce; (2) While the liquefaction pressure is less than 3.3MPa, compression power is less than liquefaction power, While the liquefaction pressure is greater than 3.3MPa, compression power is greater than liquefaction power; (3) While the liquefaction pressure of CO2 at the critical pressure 7.4 MPa, the theoretical total power is minimum.

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