Microsoft Word master thesis report fina doc

 
3.4.3. Influents / effluents scheme 
The following scheme represents simply what enters and what goes out the battery limit 
during normal operations.
Figure B-3-4: Influents/effluents scheme for catalytic reforming reaction section 
3.5. Regeneration section 
In continuous catalytic regeneration, the process utilizes moving catalyst bed technology. The 
purpose is to regenerate continuously the catalyst during normal operation and keep optimum 
operating conditions for the unit. The scheme below represents a simplified process flow 
diagram for the catalyst regeneration. 
Catalytic 
Reforming Unit 
H
2
LPG 
H
2
Fugitive emissions 
Gas relieves 
FG / FO 
Combustion gas 
Fuel gas 
Heavy Naphtha 
Reformate

---

38
Air
H
2
O
C
2
Cl
4
Catalyst inlet
Catalyst outlet
Dryer
Filter
Compressor
Washing drum
Caustic
Spent
caustic
Figure B-3-5: Simplified process flow diagram for CCR regeneration section 
Before entering the regenerator, the catalyst is sent in a lock hopper where fresh catalyst can 
be loaded in case of catalyst attrition. The pressure in this lock hopper is automated and 
depressurizations happen during around 5 minutes every 20 to 50 minutes. 
The regeneration of catalyst is achieved through the following operations: 
- Coke burning. 
- Catalyst oxychlorination. 
- Catalyst calcination. 
- Catalyst cooling. 
- Catalyst reduction. 
The first three steps are performed in the regenerator, the fourth one in a hopper located up to 
the first reactor and the last one in a reduction chamber located between the hopper and the 
reactor. 
Coke burning, oxychlorination and calcination effluents are all directed to a washing drum 
where gases are stripped with caustic soda. Reduction gas (hydrogen from another unit) is 
recycled in the reaction section. 
The following scheme represents simply what enters and what goes out the battery limit 
during regeneration.