Multivariable predictive control method for air separation device
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An air separation plant and predictive control technology, applied in general control systems, adaptive control, control/regulation systems, etc., can solve the problems of serious coupling, complex air separation plant processes, energy consumption and economic losses, etc. the effect of reducing the generation of additional cooling and reducing the rate of dissipation
Active Publication Date: 2017-12-29
盈德气体工程(浙江)有限公司
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[0005] The air separation unit has the characteristics of complex process and severe coupling; at the same time, in the production process of the air separation unit, the demand for the production gas of the external pipe network often presents the characteristics of periodicity, stages, and intermittent, and the dissipation of oxygen will cause unnecessary energy consumption and economic losses
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[0024] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments: A multivariable predictive control method for an air separation plant, the multivariable predictive control method is:
[0025] a) Add a host computer to the DCS system LAN of the air separation unit to create the air separation unit MVPC server, and the MVPC client is installed on the DCS engineer station or operator station;
[0026] b) Determine variables: Determine the controlled variable CV, the operating variable MV, and the disturbance variable DV according to the optimization objectives of the air separation unit process flow (such as reducing product flow fluctuations, reducing energy consumption, etc.);
[0027] c) The principle of establishing the size of the MVPC matrix: select key parameters, as few variables as possible; at the same time, determine the settings of CV and MV related limits; MVPC operating variables adjust the valve opening, ...
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Abstract
Disclosed is a multivariable predictive control method for an air separation device. The multivariate predictive control method comprises the steps that (a) an upper computer is additionally arranged on a DCS system local area network of the air separation device for creating an MVPC server of the air separation device; (b) variables are determined, specifically, according to the technological process optimizing target of the air separation device, the controlled variable (CV), the manipulating variable (MV) and the disturbance variable (DV) are determined; (c) the establishment principles of the size of an MVPC matrix are that key parameters are selected, the variables are controlled as less as possible, the valve opening degree, namely corresponding to the output of a PID controller under conventional control, is adjusted through the MV of an MVPC, when the MVPC works, the PID controller corresponding to the MV of the MVPC is in cascade control, the output of the PID controller tracks the MV of the MVPC, and when the MVPC does not work, the PID controller corresponding to the MV of the MVPC is in automatic control, and the MV of the MVPC tracks the output of the PID controller; (d) a model is built, specifically, an MVPC controller model is built in the air separation device, or independent MVPC controller models are built in different work sections in the air separation device; (e) the models are trained and adjusted, specifically, the gain K, the time constant Tau and the delay time Tdelay in the models are preliminarily set, and after the models are put into use, the optimized gain, time constant and delay time are provided by a system automatically; and (f) the models are put into use.
Description
Technical field [0001] The invention relates to a multi-variable predictive control (MVPC: Multi-Variable Predictive Control) method of an air separation unit used in an air separation production process, and belongs to the technical field of automation control engineering. Background technique [0002] In the process flow of the air separation unit, the raw material air enters the lower tower after a series of filtration, compression, pre-cooling, purification, pressurization, expansion, and heat exchange. After the air passes through the lower tower, it enters the lower tower. Obtain oxygen-rich liquid air at the bottom of the tower, and obtain pure liquid nitrogen at the top of the lower tower, which is throttled into the upper tower after being subcooled by a subcooler. [0003] After the upper tower is further rectified, liquid oxygen is obtained at the bottom of the upper tower, compressed by the liquid oxygen pump, and then enters the main heat exchanger. After reheating, it...
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