Some fractionators may use only one pump-around system, but others may incorporate several to control heat balance. Each is used as a type of reflux to improve the separation of the product draws above and below the pump around loop.
A fractionator bottom to reactor flow control loop uses a control valve to recycle some of the bottom slurry back to the reactor for further processing. The potential for the creation of a great deal of erosion in the control valve exists due to entrained catalyst.
Measurement and control are important on a fired heater as the natural gas used in the furnace is a direct cost contributor to your bottom line.
Should an unforeseen upset in a process arise and result in an overpressure scenario, it is imperative that the relief valves will operate when all else fails.
