Multivariate System Identification Method for Molecular Distillation Process

A system identification and molecular distillation technology, applied in the field of mathematical model establishment of molecular distillation process, can solve the problem that the mathematical model establishment method cannot be well applied to industrial distillation process and the like

Active Publication Date: 2017-02-15
CHANGCHUN UNIV OF TECH
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Problems solved by technology

[0005] In order to solve the technical problem that the existing molecular distillation mathematical model establishment method in the field of multivariable system model identification cannot be well applied to the actual industrial distillation process, the present invention provides a multivariable system identification method for the molecular distillation process

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  • Multivariate System Identification Method for Molecular Distillation Process
  • Multivariate System Identification Method for Molecular Distillation Process
  • Multivariate System Identification Method for Molecular Distillation Process

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Embodiment Construction

[0073] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0074] against figure 1 In the molecular distillation process shown, when applying the multivariable system identification method of the molecular distillation process of the present invention, firstly, a mathematical model of the molecular distillation process is established according to the aforementioned steps 1 and 2. And assign and solve related variables as follows:

[0075] The tests were all carried out under the initial condition that the heater terminal voltage was 0V and the opening of the vacuum valve was 0%. The initial temperature in the evaporator is 23.3°C and the initial pressure is 101 335.2Pa, then the initial equilibrium point Z in formula (1) 1 (0)=23.3, Z 2 (0)=101335.2.

[0076] The model identification process of the heater terminal voltage and the temperature and pressure in the evaporator is as follows:

[0077] ...

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Abstract

The invention provides a method for identifying a multivariable system in the molecular distillation process, and belongs to the field of mathematical model establishment methods in the molecular distillation process. According to the method, an evaporation system of molecular distillation equipment is simplified to be the multivariable system with two input parts and two output parts, the mature method of least squares is used for obtaining an evaporation system model, and the method gets rid of the excessive demands for the precise measurement values of several special sampling points. Based on practical industrial operation data, the obtained model is verified. The result shows that the method achieves high identification precision, is convenient to implement and prone to engineering realization, and is also suitable for identifying models of one kind of industrial processes.

Description

technical field [0001] The invention belongs to the field of a mathematical model establishment method of a molecular distillation process, and in particular relates to a multivariable system identification method of a molecular distillation process. Background technique [0002] The molecular distillation process is a multiple input multiple output (MIMO) system with time-delay and multi-variable characteristics. Due to the strong coupling relationship between temperature and vacuum degree, the main process parameters that affect the separation effect of molecular distillation, they interact with each other during the distillation process, making it difficult to precisely control them, and the set value of the process requirements cannot be reached, resulting in unsatisfactory separation effect and product purity. , Even the separation of theoretically separable components cannot be achieved through equipment. This is a common problem in chemical production and is also a di...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B13/04
Inventor 李慧陈灿李颖张德江尤文杨宏韬果芯如王佳增
Owner CHANGCHUN UNIV OF TECH
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