Minimizing Energy Consumption in CO₂ Capture Processes Through Process Integration

This chapter reviews the thermal integration for minimum external energy consumption of CO₂ capture process using amines. Post combustion capture of CO₂ through the use of amines is a well established technique; the stand alone process is highly energy-intensive since the recovery of the amine solution is achieved through the use of a separation process where heating and cooling are required. Energy integration of the hot flue gas coming from a power station plant from where CO₂ is absorbed can serve the purpose of providing the heating and cooling needs of the process. Heat recovery through steam raising is considered for heating, cooling and for the production of power for the operation of pumps and compressors. The results show that the needs of the largest energy user of the process can be fully met by heat integration.

Keywords: Minimum energy consumption, CO2 capture, process integration, numerical simulation.