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System and method for proportional plus integral control in air separation energy saving process

A proportional-integral control and air separation technology, applied in electrical program control, comprehensive factory control, comprehensive factory control, etc., can solve problems such as poor robustness, low precision, and low efficiency

Inactive Publication Date: 2010-12-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of low efficiency, low precision and poor robustness of the existing control system of the air separation energy-saving process, the present invention provides a high-efficiency, high-precision, and robust proportional-integral control system for the air separation energy-saving process Control system and method

Method used

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  • System and method for proportional plus integral control in air separation energy saving process
  • System and method for proportional plus integral control in air separation energy saving process
  • System and method for proportional plus integral control in air separation energy saving process

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Embodiment 1

[0034] refer to figure 1 with figure 2 , a proportional-integral control system for an air separation energy-saving process, comprising an on-site intelligent instrument 2 and a DCS system 12 directly connected to an air separation tower 1, and the DCS system 12 includes a storage device 4, a control station 5 and a host computer 6, so The on-site intelligent instrument 2 is connected with the storage device 4, the control station 5, and the host computer 6 in turn through the field bus and the data interface 3; Temperature, pressure data, described data interface is in order to realize the function of I / O module 8 namely the input and output of data, host computer 6 comprises the proportional-integral controller in order to solve proportional-integral control law and output control variable change value, so The proportional-integral controller described above includes a component estimation module 9 and a proportional-integral control law solution module 10 .

[0035] Desc...

Embodiment 2

[0045] refer to figure 1 with figure 2 , a proportional-integral control method of an air separation energy-saving process, said control method comprising the following steps:

[0046] 1) Determine the sampling period t, and the t value, the relative volatility of nitrogen and oxygen relative to argon α N 、α O , the Antony constant a N , b N 、c N 、a O , b O 、c O stored in the historical database;

[0047] 2) Set the control law parameter k 11 , k 12 , k 21 , k 22 and the set value of liquid nitrogen concentration at the top of the upper tower X 1， 1 * , the set value of the concentration of liquid oxygen at the bottom of the tower X 3，n * ;

[0048] 3) Detect the pressure P in the rectification section at time k r (k), each tray temperature T i (k), calculate the component concentration value of liquid nitrogen and liquid oxygen, adopt formula (1) (2) to obtain:

[0049] X i , N ...

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Abstract

The invention relates to a system for proportional plus integral control in an air separation energy saving process, which comprises a field intelligent instrument and a DCS system which are directly connected with an air separation tower, wherein the DCS system comprises a storage device, a control station and an upper computer, the field intelligent instrument is connected with the storage device, the control station and the upper computer, the upper computer comprises a proportional plus integral controller for solving control law output operation variable values, and the proportional plus integral controller comprises a component inferring module and a proportional plus integral control law solving module. The invention also provides a method for proportional plus integral control in an air separation energy saving process. The invention can effectively and quickly track the change of set values in the air separation energy saving process, and can establish a proportional plus integral control scheme with simple structure and high-efficiency control based on the condition that a control model in the air separation energy saving process can be easily subject to model mismatch.

Description

technical field [0001] The invention relates to the control design field of the air separation energy-saving process, in particular, relates to the design and method of the proportional-integral control system of the air separation energy-saving process. Background technique [0002] Air separation is an important industry in the national economy that separates air to obtain high-purity industrial gases such as oxygen, nitrogen, and argon. Its products are widely used in petroleum, chemical, metallurgy, electronics, energy, aerospace, food and beverage, medical care, etc. kind of industrial field. The huge energy consumption has always been the bottleneck of the air separation industry. [0003] Due to the complex dynamic characteristics of the air separation process, such as strong nonlinearity and coupling, it is difficult to establish a robust control scheme. Although the predictive control scheme based on the approximate linear model has achieved better control effect ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 刘兴高周叶翔
Owner ZHEJIANG UNIV
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