Simulation and Analysis of Carbon Dioxide Capture Process with Split Flow Modification Using MDEA/PZ Blend Solution in a Coal-fired Power Plant

  Introduction  Flow sheet modification is an important method to reduce the high energy cost in carbon dioxide capture process by amine chemical absorption in coal-fired power plant.

  Method  The performances of MEA and MDEA/PZ solution in three carbon dioxide capture processes with split flow modifications were simulated by Aspen plus soft. The effects of lean load and split ratio on CO₂ regeneration heat duty and cold duty were analyzed, and stripping process property was revealed by analysis of concentration and temperature driving force.

  Result  It showed that all the three split flow modifications can effectively reduce the heat and cold duty. The modification case 3 presented the best performance because this modification led to better distribution of driving force, reducing the irreversible loss significantly.

  Conclusion  Compared to convention MEA process, MDEA/PZ process with the case 3 modification reduced the heat and cold duty by 35.36% and 71.42%, showing good potential in industrial application.