INTEGRATED BLACK LIQUOR GASIFICATION POLYGENERATION SYSTEM WITH CO_2 CAPTURE IN PULP AND PAPER MILLS TO PRODUCE METHANOL AND ELECTRICITY

摘要

Based on KAM~a pulp and paper mill, a polygeneration system integrated with a black liquor gasifier is proposed. The effects of CO_2 captured by oxygen-fuel combustion and Selexol absorption on the performance of the polygeneration system are studied in terms of both thermodynamic performance and cost assessment. Using the Aspen Plus simulator, the performance of the studied polygeneration systems are analyzed from the perspectives of the first and second laws of thermodynamics. Compared with the reference system, the first law efficiency of the polygeneration system increased from 15.7% to 29.3%, with an investment increment of 17.9%. The investment incremental rates for CO_2 capture by oxyfuel combustion and Selexol absorption are 15.1% and 16.7%, respectively. Energy penalty due to CO_2 capture and compression is 0.61 MJ electricity/kg CO_2, avoided in the oxygen-fuel method at a cost of $29.6/tonne CO_2. However, energy penalty can reach 1.03 MJ product {electricity and methanol) per kg CO_2, avoided in the Selexol absorption CO_2 capture process at a cost of $46.0/tonne CO_2.