No. 4 Platformer Heater Capacity Improvement
In October 2000, FIS carried out a Platformer Heater Revamp for a refinery located in South Texas.
The four-cell Reformer Heater was originally designed for a total heat duty of 184 MMBtu/hr. The heater had process coils to process Naphtha + Recycle Gas, Stripper Reboiler, and Stabilizer Reboiler services. Client was facing heater performance issues as the heater was operating at reduced charge rate in each cell as compared to the original design. The Process, Stabilizer, and Stripper Reboiler coils were absorbing low heat duties. All four cells were operating at very high excess air and low firing rates. Cell A/B and cell C/D were operating at 120% and 100% excess air, respectively.
Client wanted to increase the capacity and improve the efficiency of this heater. However, steam generation or combustion air preheating was not desired. Client also wanted to increase absorbed heat duty of the Stripper and Stabilizer Reboilers.
Equalizing Pressure Drop:
Split Flow Technology works on the concept of equal temperature difference and pressure drop in parallel streams. FIS installed orifices in the transfer lines (manifold Pipe) to equalize the pressure drop. The orifice provides restriction to fluid flow and increases the fluid pressure drop as required. The orifice size is selected based on required pressure drop to be achieved across orifice.
FIS carried out the entire scope of activities from conceptualization to commissioning of this heater revamp. The heater was successfully commissioned in October 2002. After revamp, the capacity of this heater was improved from 18,500 BPD to 24,000 BPD.