Method for removing coke from fluid coker outlets

摘要

Coke is removed from a cyclone vapor outlet by continuously introducing a stream of relatively low pressure steam into a vapor outlet, adding a stream of high pressure steam to the low pressure stream, subsequently adding a stream of high pressure water to the high pressure steam, and discontinuing the introduction of high pressure steam. After the desired amount of coke has been removed from the outlet by thermal shocking, the introduction of high pressure water is discontinued. Thereafter, if desired, low pressure air may be introduced into the low pressure steam to control coke deposition by localized combustion.