Apparatus and methods for regeneration of precipitating solvent

摘要

A regenerator that can handle rich loaded chemical solvent containing precipitated absorption reaction products is disclosed. The invention is particularly suitable for separating CO2 from large gas streams that are typical of power plant processes. The internally circulating liquid stream in the regenerator (ICLS regenerator) rapidly heats-up the in-coming rich solvent stream in a downcomer standpipe as well as decreases the overall concentration of CO2 in the mixed stream. Both these actions lead to dissolution of precipitates. Any remaining precipitate further dissolves as heat is transferred to the mixed solution with an inverted bayonet tube heat exchanger in the riser portion of the regenerator. The evolving CO2 bubbles in the riser portion of the regenerator lead to substantial gas hold-up and the large density difference between the solutions in the downcomer standpipe and riser portions promotes internal circulation of the liquid stream in the regenerator. As minor amounts of solvent components present in the exit gas stream are condensed and returned back to the regenerator, pure CO2 gas stream exits the disclosed regenerator and condenser system.

主权项

1. A system for regeneration of species removal media with precipitates comprising:
a regenerator comprising: a process stream inlet for receiving a process stream comprising rich unwanted species containing precipitates; a downcomer standpipe column into which the process stream is directed; an internally circulating liquid stream of species removal media comprising chemical solvent; and a set of inverted bayonet tubes located inside of the regenerator and heated with a heat media, the heated set of inverted bayonet tubes transferring heat to the chemical solvent; an overflow system for recovering regenerated lean chemical solvent from an overflow arrangement and storing the regenerated chemical solvent in a lean chemical solvent surge tank; a cooling system to cool an exiting gas stream from the regenerator with the process stream, wherein the exiting gas stream is formed upon interaction of the process stream with a rich concentration of unwanted species and the internally circulating liquid stream; and a condenser for regenerating the chemical solvent.