ENERGY-SAVING ACIDIC GAS CAPTURE SYSTEM AND METHOD USING SEPARATED WATER

摘要

The present invention relates to a system capable of reducing the amount of heat to be provided to a regeneration tower for regenerating an absorbent which is a system for capturing acidic gas such as carbon dioxide, and a method therefor, and the present invention provides an acidic gas capture system and an acidic gas capture method capable of reducing energy consumption by utilizing the heat generated from a system for capturing acidic gas. The system and the method of the present invention provide the advantages of: lowering a cooling capacity of a condenser during the condensation of gas to be treated by thermally exchanging high-temperature gas to be treated with low-temperature separated water generated during a capture step; and lowering a reboiler heat duty by introducing the low-temperature separated water into a regeneration tower in a preheated state. Furthermore, energy-saving during an absorbent regeneration step is facilitated since the low-temperature separated water is also utilized for a wash tower and dilute solution cooling through a heat-integrated step with condensate water generated during a process.