Delayed coker feed heater on-line steam-chemical decoking method

摘要

A process for decoking of delayed coker feed heater pass is disclosed. A chemical mixture containing a metal hydroxide and a metal carbonate is combined with steam to decoke the delayed coker feed heater pass.

主权项

1. A process for decoking a delayed coker feed heater comprising the steps of:
(a) supplying a mixture of steam and predetermined chemical amount at pre-calculated radiant coil outlet temperature by controlling heater firing; (b) decreasing the flow of steam and while maintaining radiant coil temperature and chemical injection rate; and (c) further decreasing the flow of steam while maintaining radiant coil temperature and chemical injection rate until heater de-coking is complete.