A Feedback Control Method for Catalytic Cracking Unit

Abstract

The invention provides a feedback control method for a catalytic cracking unit, comprising the following steps: S1, preset the set value T of the reaction temperature in the separator c ; S2. Based on the process variable measured in the catalytic cracking unit, construct the controlled variable C, and preset its set value C s ; process variables include regenerator temperature T rg , Riser temperature T ri ;Controlled variable C=aT rg +bT ri , a and b are constants; S3, the feedback controller controls and adjusts the setting value T of the reaction temperature c , to achieve the regenerator temperature T rg and riser temperature T ri Adjustment, and then adjust the controlled variable C, reduce the controlled variable C and its set value C s Between the error D, so that the error D is not greater than 0.1, the error of the present invention is controlled by the controller to adjust the set value T of the reaction temperature c , so that the new controlled variable C is maintained at the set value C s Nearby, the set point T for the reaction temperature is achieved c The automatic adjustment of the catalytic cracking unit makes the operation of the catalytic cracking unit more stable, and the operating efficiency, product yield, and processing capacity are higher.

Description

technical field [0001] The invention relates to the technical field of catalytic cracking, in particular to a feedback control method of a catalytic cracking unit. Background technique [0002] The catalytic cracking unit is one of the core processes in the petroleum refining and chemical industry, and it is also one of the most difficult processes to operate. Its control system plays an important role in achieving stable and efficient operation of the catalytic cracking unit, and ensuring process safety and stable operation of the unit is the key to catalytic cracking. The primary goal of plant operation. The existing catalytic cracking unit includes, the separator is also called a reactor and a regenerator, and a riser is arranged at the lower end of the separator, and the regenerator and the separator are connected through a standby inclined pipe and a regeneration inclined pipe. The inclined pipe and the regeneration inclined pipe are respectively provided with a first ...

AI Technical Summary

Problems solved by technology

A relatively popular control method for the catalytic cracking unit is to use the second control switch to adjust the flow rate of the regenerated catalyst to stabilize the holding capacity in the regenerator. In addition, by adjusting the first and third control switches, Keep the reaction temperature in the separator and the temperature of the cyclone separator at the set value to maintain the stable operation of the catalytic cracking unit; although the existing control method can meet the basic operating requirements of the catalytic cracking unit, but in various external disturbances Under the influence of various factors, such as the frequent fluctuations of parameters such as the composition, temperature, and mixing ratio of the raw oil entering the riser, the characteristics of the catalytic cracking unit itself also change due to various reasons, such as equipment aging, pipeline fouling, etc., so the original There are fixed variable setting values, especially the reaction temperature setting value of the separator, which cannot ensure that the catalytic cracking unit is in the best state, resulting in low operating efficiency, product yield, and processing capacity of the catalytic cracking unit. , so it is necessary to improve the existing control methods to improve production efficiency

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