Method for optimizing catalyst/oil mixing in an FCC reactor feed zone

摘要

A method of improving the uniformity of the contacting of a heavy oil feed with FCC cracking catalyst in the feed zone of an FCC cracking riser in which the heavy oil feed is injected into the catalyst in the riser by means of feed injectors located around the riser, the method comprising minimizing the differences in the temperature profile in the oil/catalyst mixture across the feed zone by varying the oil feed rate to the injectors.

主权项

1. A method of improving the uniformity of the contacting of a heavy oil feed with an FCC cracking catalyst in a feed zone of an FCC cracking riser in which the heavy oil feed is injected into the riser by means of feed injectors located around the riser, wherein the heavy oil contacts the catalyst in the feed zone to create an oil/catalyst mixture, the method comprising:
a) Measuring the temperature profile of the oil/catalyst mixture in the feed/mixing zone of the FCC riser in a feed injector step test in which the oil feed rate to each feed injector is varied while the temperature profile information is recorded; b) Developing a temperature response matrix model from the temperature profile information from Step a), wherein the temperature response matrix model indicates a temperature change with one injector closed from a base case with all injectors fully open; c) Determining from the temperature response matrix model the optimum feed rate for each injector at which the temperature difference across the feed zone is minimized by using the temperature response matrix model to develop a predictive model from an optimization algorithm; and d) Adjusting the oil feed rate into the feed zone through each of the individual feed injectors at a flow rate based on the determination from the temperature response matrix model.