Low pressure stripping in a gas purification process and systems thereof
View Patent ↗Processes for operating an ammonia stripper at a low pressure in a gas purification system include providing a first side-draw stream from the ammonia stripper; heating the first side-draw stream with a second side-draw stream from a regenerator; providing a stripper offgas stream from the ammonia stripper to a stripper overhead condenser; and utilizing the stripper offgas stream as a heat source for a regenerating system fluidly coupled to the stripper overhead condenser. Also disclosed are systems for implementing the processes.
1. A process for operating an ammonia stripper at a low pressure in a gas purification system, the process comprising:
providing a first side-draw stream from the ammonia stripper;
heating the first side-draw stream with a second side-draw stream from a regenerator;
providing a stripper offgas stream from the ammonia stripper to a stripper overhead condenser; and
utilizing the stripper offgas stream as a heat source for a regenerating system fluidly coupled to the stripper overhead condenser.
2. The process of claim 1 , wherein utilizing the stripper offgas stream as the heat source comprises exchanging heat from the stripper offgas stream with a slip stream of a rich absorbent solution and feeding the slip stream into the regenerator.
3. The process of claim 1 , further comprising cooling a stream of acidic component from the regenerator with a slip stream of a rich absorbent solution in the regenerating system.
4. The process of claim 3 , wherein a flow rate of the slip stream effective to cool the stream of acidic components is less than a flow rate of the slip stream without heating the first side-draw stream from the ammonia stripper with the second side-draw stream of the regenerator.
5. The process of claim 1 , further comprising compressing the stripper offgas stream.
6. The process of claim 1 , wherein utilizing the stripper offgas stream as the heat source comprises exchanging heat from the stripper offgas stream with a third side-draw stream from a bottom portion of the ammonia stripper.
7. The process of claim 6 , wherein the third side-draw stream is partially vaporized in the stripper overhead condenser.
8. The process of claim 1 , wherein utilizing the stripper offgas stream as the heat source comprises exchanging heat from the stripper offgas stream with a slip stream of rich absorbent solution from an absorber.
9. The process of claim 8 , further comprising providing the heated slip stream to the regenerator.
10. The process of claim 1 , further comprising utilizing a low pressure steam in a reboiler fluidly coupled to the ammonia stripper.
11. The process of claim 10 , further comprising operating the ammonia stripper at a pressure of about 30 to about 120 pounds per square inch.