Non-linear prediction control system and method in internal thermal coupling distillation process
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A non-linear prediction, internal thermal coupling technology, applied in the direction of electrical program control, comprehensive factory control, comprehensive factory control, etc., can solve the problems of poor control effect and unsatisfactory control quality.
Inactive Publication Date: 2012-06-06
ZHEJIANG UNIV
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[0004] In order to overcome the shortcomings of poor control effect and unsatisfactory control quality of the current internal thermally coupled rectification process, the present invention provides a nonlinear predictive control system and method for internal thermally coupled rectification process with good control effect and ideal control quality
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Embodiment 1
[0069] refer to figure 1 , figure 2 , a nonlinear predictive control system for an internal heat-coupled rectification process, including an on-site intelligent instrument 2 and a DCS system directly connected to an internal heat-coupled rectification tower 1, and the DCS system includes a storage device 4, a control station 5 and an upper Machine 5, field intelligent instrument 2 is connected with data interface 3, and described data interface 3 is connected with field bus, and described field bus is connected with storage device 4, control station 5 and upper computer 6; Described upper computer 6 includes for Rolling optimization solution control law, output nonlinear predictive controller of control variable value, described nonlinear predictive controller includes component inference module 9, model parameter self-adaptive correction module 10, control law rolling optimization solution module 11;
[0070] The component inference module 9 is used to obtain temperature an...
Embodiment 2
[0096] refer to figure 1 and figure 2 , a kind of nonlinear predictive control method of internal thermal coupling rectification process, described control method comprises the following steps:
[0097] 1) Determine the sampling period T, and compare the T value, the relative volatility α, the stripping section pressure P s , the Anthony constants a, b, c are stored in the historical database;
[0098] 2) Set control law parameter K according to control requirements and object characteristics 1 , K 2 , the predicted time-domain length t n , t 0 = 0, the set value of light component concentration in the liquid phase at the top and bottom of the tower X 1 * , X n * , and store the set value in the historical database
[0099] 3) Obtain the pressure P of the rectification section at k sampling time from the smart instrument r , pressure in the stripping section P s , and each tray temperature T i , to calculate the concentration of light components in the liquid pha...
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Abstract
The invention relates to a non-linear prediction control system in an internal thermal coupling distillation process, which comprises a field intelligent instrument and a DCS system which are directly connected with an internal thermal coupling distillation tower; the field intelligent instrument is connected with a storage device, a control station and an upper computer; the upper computer comprises a non-linear prediction controller which is used to roll, optimize and solve a control law and output a control variable; the non-linear prediction controller comprises a component deduction module, a model parameter self-adaptive correction fitting module, and a control law rolling, optimizing and solving module; the component deduction module is used to obtain temperature and pressure data from the intelligent instrument, and calculate the component concentration of all tower plates of the high-efficiency energy-saving distillation tower, the model parameter self-adaptive correction fitting module is used to adopt the component concentration data calculated by the component deduction module in a historical database and fits the model parameters on line; and the control law rolling, optimizing and solving module is used to optimize and solve the ideal value of the current control variable according to the current component concentration data, model functions and the current time operation variable. The invention also provides a non-linear prediction control method. The invention has good control effect and ideal control quality.
Description
technical field [0001] The invention relates to the field of rectification energy-saving control, and in particular proposes a nonlinear predictive control system and method for an internal heat-coupled rectification process. Background technique [0002] The rectification process is a core process in the chemical process, and the rectification column is one of the key units. For a long time, the rectification column has become the focus of research in the field of international distillation because of its high energy consumption and low energy efficiency. At present, there are two main solutions to the energy consumption problem in the rectification process: one is to design a new structure, which uses heat coupling to realize energy reuse to achieve energy saving purposes; the other is to design a high-efficiency distillation process control strategy to improve product quality and reduce waste So as to achieve the purpose of energy saving. Although many experimental stud...
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