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Crude oil preheating temperature control method in process of catalytic cracking

A technology of catalytic cracking and preheating temperature, which is applied in the direction of temperature control, electric temperature control, electric controller, etc. It can solve the problems of large overshoot and vibration, affecting the control of crude oil preheating temperature, etc., and achieves the improvement of control accuracy and The effect of stability

Inactive Publication Date: 2017-05-31
DONGHUA UNIV
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Problems solved by technology

Traditional PID is only suitable for small or no time-delay control systems, and the dynamic process of crude oil preheating is a process with a large time-delay. When a step signal is input, large overshoots and oscillations often occur, which affect the crude oil. preheating temperature control

Method used

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  • Crude oil preheating temperature control method in process of catalytic cracking
  • Crude oil preheating temperature control method in process of catalytic cracking
  • Crude oil preheating temperature control method in process of catalytic cracking

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Embodiment Construction

[0030] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0031] The embodiment of the present invention relates to a method for controlling the preheating temperature of crude oil in the catalytic cracking process, which is used to suppress the overshoot and oscillation in the preheating process and improve the control performance. The present invention first establishes an extended state space model for crude oil preheating in the catalytic cracking process by combining state variab...

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Abstract

The invention relates to a crude oil preheating temperature control method in the process of catalytic cracking, specifically comprising the following steps: first, building an extended state space model of crude oil preheating in the process of catalytic cracking through combination of a state variable, output tracking error and a set value variable to better deal with overshoot and oscillation caused by possible unknown disturbance during crude oil preheating; then, using an improved MOEA / D-DE algorithm to optimize a weighted matrix in an objective function; and finally, designing a PI-PD (PFC-PIPD) controller with predictive function control performance. The method improves the precision and speed of temperature tracking, and has good control performance.

Description

technical field [0001] The invention relates to the technical field of industrial automation, in particular to a method for controlling the preheating temperature of crude oil in a catalytic cracking process. Background technique [0002] The catalytic cracking process is a key link in petroleum refining, and in the catalytic cracking process, the preheating temperature of crude oil is a very important variable, which directly affects the heat balance and reaction depth of the reaction process. Therefore, achieving good preheating temperature control can directly improve the production efficiency of crude oil. Traditional PID is only suitable for small or no time-delay control systems, and the dynamic process of crude oil preheating is a process with a large time-delay. When a step signal is input, large overshoots and oscillations often occur, which affect the crude oil. preheating temperature control. Therefore, it is urgent to propose a new control method to improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B11/42G05D23/19
CPCG05B11/42G05D23/1919
Inventor 叶婵峰沈波
Owner DONGHUA UNIV
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