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Prediction function control method during ethylbenzene dehydrogenation production process

A technology of predictive function control and production process, which is applied in the direction of adaptive control, general control system, control/regulation system, etc., and can solve problems such as difficult to guarantee the stability of the control system and non-optimal operation of the system control

Inactive Publication Date: 2014-10-22
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0008] The technical problem to be solved by the present invention is that there is a single-loop control in the production process of ethylbenzene dehydrogenation in the prior art, the system control is not optimally operated, and the stability of the control system is difficult to guarantee

Method used

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  • Prediction function control method during ethylbenzene dehydrogenation production process
  • Prediction function control method during ethylbenzene dehydrogenation production process
  • Prediction function control method during ethylbenzene dehydrogenation production process

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specific Embodiment approach

[0076] (1) According to the process characteristics, determine the system model parameters and take two basis functions u 1B1 (t)=u 2B1 (t)=e -t / Ts , u 1B2 (t) = μ 2B2 (t)=1-e -t / Ts .

[0077] (2) Prediction time domain Sampling time T s =1s, T ref =[1 2] T s.

[0078] (3) Find MIN the optimal solution of present moment control law

[0079] U(k)=u B (0)μ(k)

[0080] in

[0081] μ ( k ) = ( Y ‾ T T ‾ ) - 1 Y ‾ T [ Y R ( k ) ...

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Abstract

The present invention relates to a prediction function control method during an ethylbenzene dehydrogenation production process, mainly for solving the problems in the prior art that the dehydrogenation production process is in single loop control, the system control is not the optimal operation, and the stability of a control system is difficult to guarantee. The prediction function control method during the ethylbenzene dehydrogenation production process of the present invention is based on the multivariable prediction function control, utilizes a state space model to represent a prediction model of the dehydrogenation production process, constructs the process control input by a primary function concept, defines the performance indexes, and constructs a multivariable prediction function control algorithm. The construction of the multivariable prediction function control algorithm comprises the steps of (1) establishing the process control input based on a primary function which is characterized by selecting a future system control input composed of primary function weighing; (2) establishing the state space model by observable variables; (3) establishing future system expected performance indexes; (4) deducing future prediction output; (5) analyzing the stability of the control system and guaranteeing the tracking set value zero deviation. The prediction function control method during the ethylbenzene dehydrogenation production process solves the problems better, and can be used for the operation control of the multivariable production process, such as the ethylbenzene dehydrogenation production process, etc.

Description

technical field [0001] The invention relates to a predictive function control method of a multi-input and multi-output ethylbenzene dehydrogenation production process. Background technique [0002] Styrene is an important raw material in the chemical process, used to produce polystyrene, acrylonitrile-butadiene-styrene terpolymer, unsaturated polyester and styrene thermoplastic elastomer, etc. Large energy consumption and material consumption[ 1 ]. In the production process of ethylbenzene / styrene, the core part of the unit is the ethylbenzene dehydrogenation system, whose operation status determines the output of styrene, and is also the bottleneck for the styrene unit to exert its optimal output. If the ethylbenzene dehydrogenation system operates stably, and the conversion rate of ethylbenzene and the selectivity of styrene are good, the material consumption and energy consumption of styrene production will be relatively low. The ethylbenzene catalytic dehydrogenation ...

Claims

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Application Information

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IPC IPC(8): G05B13/00
Inventor 张彬刘文杰张洪宇张忠群
Owner CHINA PETROLEUM & CHEM CORP
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