6 replies to this topic

[Eric Nguyen]

We have 3 slurry pump at Mainfractionator bottom in RFCC unit, 2 pump in service and another in standby and keep warming up condition by openning warm up valve but we faced to much catalyst fine acumulated at pump casing and suction/discharge piping. it caused Slurry separator overloaded when we run standby pump..

How to explain in this situation and how to prevent accumulated catalyst fine during pump in standby mode..Pls give me some ideas...

[Sungho Song]

Dear Mr. Tri

 

This is the normal problem in FCC. In our case, SLO filter is bypassed before we switch MC bottom pump.

Rundown tank also bypassed.

 

Thanks.

[Eric Nguyen]

Dear Mr Song

Thank your reply..

We start /stop standby slurry pump every 3 day to avoid much accumulated fine at casing and DCO was offspec during 2 day, sometime it didn't work well and i think much catalyst fine when we start standby pump will cause erosion at control valve reducer. That is not our wat, so do you have any idea to stop catalyst fine in casing pump. Can we run 3 pump instead of 2 pump? I think it is not a economical case...!

 

Best regards

[Profe]

Hi Hoang Tri

 

For your problem: What if you use a filter or a hydrocyclone for heating oil line before entry to pumps casing?

 

Good luck

Fausto

Edited by Profe, 29 August 2013 - 06:18 PM.

[Killer Queen]

I think your system is facing with the fouling. The catalyst fines is one of the factors leading to fouling. An effective antifoulant (chemical) should be used at the bottom to prevent this phenomenon for long term

Edited by Killer Queen, 18 September 2013 - 06:28 AM.

[Eric Nguyen]

Dear sir

 

I don't think any fouling occur in my column bottom ...because catalyst was only accumulated in slurry pump casing and heat transfer was still good. We had experienced serious fouling caused by asphalten and we known well about this phenomenon..

We are going to approve 3 slurry pump will be run in parallel to avoid accumulated fine in standpump..Is there any comment in this case?

 

Best regards

Edited by Hoang Tri, 18 September 2013 - 09:11 AM.

[saeed.s]

Hi Hoang Tri

how much is catalyst content in main column bottom ? also velocity in reactor cyclone & diff pressure between reactor cyclone and plenum ?

thanks