| 摘要 |
A method for operating a multi-stage FSU system in the event that a second or subsequent FSU in the system is not operating to specification, so that operators may remedy the problem without shutting down the entire system and while maintaining a desired solvent to bitumen ratio. In the method, solvent that is normally added to the underflow stream recovered from an FSU in the system and delivered to a second or subsequent FSU, is redirected either in whole or in part, around the second or subsequent FSU. This redirected solvent is added to the multi-stage FSU system downstream of the second or subsequent FSU, thereby maintaining the solvent to bitumen ratio and enabling the multi-stage FSU system to operate until the problem with the second or subsequent FSU is resolved. |
