Turndown thermocompressor design for continuous catalyst recovery

摘要

Systems and processes for regenerating catalyst are provided herein that include a catalyst regeneration tower having a cooling zone that receives a catalyst cooling stream generated by a cooling gas loop. The systems and processes include a first thermocompressor that utilizes a first motive vapor and a second thermocompressor that utilizes a second motive vapor in order to provide the catalyst cooling stream to the regeneration tower. The second thermocompressor operates in parallel with the first thermocompressor. The first thermocompressor can utilize combustion air as the motive vapor. The second thermocompressor can utilize nitrogen as the motive vapor.

主权项

1. A process for regenerating catalyst, the process comprising:
removing a first gas stream from a regeneration tower; passing the first gas stream to an air heater to form a heated first gas stream; dividing the heated first gas stream to form a regeneration tower return stream and a cooling loop stream; cooling the cooling loop stream in a cooling zone cooler to form a cooled stream; providing a first thermocompressor and a second thermocompressor; selectively providing the cooled stream to the first thermocompressor that utilizes a first motive vapor for a period of time and the second thermocompressor that utilizes nitrogen as a second motive vapor for another period of time, to produce a catalyst cooling stream wherein the nitrogen is provided to the second thermocompressor at a higher pressure than the first motive vapor is provided to the first thermocompressor; and providing the catalyst cooling stream to the regeneration tower.