US 9,809,753 B2
Coke drum quench process
Dale William Wilborn, Rolling Hills Estate, CA (US); Eileen Imelda Love, Long Beach, CA (US); and Mark Anthony Alvarado, Lakewood, CA (US)
Assigned to Chevron U.S.A. Inc., San Ramon, CA (US)
Filed by Dale William Wilborn, Rolling Hills Estate, CA (US); Eileen Imelda Love, Long Beach, CA (US); and Mark Anthony Alvarado, Lakewood, CA (US)
Filed on Apr. 23, 2013, as Appl. No. 13/868,877.
Prior Publication US 2014/0311885 A1, Oct. 23, 2014
Int. Cl. C10B 55/00 (2006.01); C10B 39/06 (2006.01); C10G 9/00 (2006.01)
CPC C10B 39/06 (2013.01) [C10B 55/00 (2013.01); C10G 9/005 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A process for quenching coke in a coke drum of a delayed coker unit, the process comprising:
a) feeding quench water to the coke drum during an initial quench phase of the quenching process at an initial quench rate;
b) after step a), increasing the rate of feeding the quench water to the coke drum during a ramp quench phase of the quenching process to attain a maximum ramp quench rate, wherein during the ramp quench phase the coke drum internal pressure increases to a maximum pressure level and thereafter the coke drum internal pressure decreases to a transitional pressure level; and
c) at the time of the transitional pressure level, actuating at least one control valve in a blowdown system that receives overhead vapors from the coke drum, whereby the coke drum internal pressure increases from the transitional pressure level to a pulsed pressure level.