(211c) Advanced Operating Strategies to Enhance the Performance of Chemical Looping Natural Gas Reforming Processes
AIChE Annual Meeting
Monday, November 8, 2021 - 4:30pm to 5:00pm
By producing the syngas and regenerating the oxygen carriers in separate reactors, the CLR process offers significant flexibilities in process design. Many advanced process design strategies can be adopted in CLR processes to further improve the product yield, the energy efficiency, and the economic benefits. This work focuses on analyzing these different strategies and quantify their benefits. The following strategies are studied in detail: (1) separating the reducer into multiple modules operated at different conditions; (2) operating the reducer and combustor at different pressures by using solid pressure changing device; and (3) recycling downstream flue gas and purge gas back to the reducer. The CLR system as well as its integration with downstream chemical production are simulated in ASPEN Plus. Material, heat, and power balances are established in the process models to achieve autothermal operation in the overall process systems, and their performance is compared with SMR and ATR. The results indicate that the CLR processes can improve the product yield by 5-15% over conventional technologies. Moreover, using the advanced operating strategies can further improve the energy efficiency of those CLR processes by ~5%, which is an additional benefit granted by the flexibility of the CLR processes.