Q & A > Question Details
How to control same bed outlet temperature in hydrotreater reactor?
26/05/2019 A: Vishnu Prasad, Hindustan Petroleum Corporation Ltd, prasadvishnu@hpcl.in
Bed outlet temperature can be controlled by keeping the outlet temperature in Auto-Cascade control with bed inlet temperature. The bed inlet temperature, in turn, is controlled by the rate of quench hydrogen flow to the inlet of the catalyst bed. Control systems exist where set point is provided for bed outlet temperature, which modifies the bed inlet temperature & quench hydrogen flows. In this way you can keep all the outlet bed temperatures at the same value.
10/10/2017 A: Eric Vetters, ProCorr Consulting Services, ewvetters@yahoo.com
The delta T across a reactor bed is going to be what it's going to be. To limit the outlet temperature of a bed you need to control the inlet temperature to the bed. For the top bed this means changing the control point for the reactor inlet temperature. For subsequent beds, the inlet temperature is controlled by the amount of quench injected before the bed.
10/10/2017 A: Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
If there is no inter-bed quench to adjust, the reactor outlet temperature will be the result of the feed composition and catalyst condition. There is nothing to adjust shift by shift.