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High-purity control system and method of air separation energy-saving process

A control system, high-purity technology, applied in the direction of electrical program control, comprehensive factory control, comprehensive factory control, etc., can solve the problems of poor tracking performance, low efficiency, low precision, etc.

Inactive Publication Date: 2010-07-14
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of the existing control system of the air separation rectification process, which cannot suppress interference in time, cannot handle coupling problems well, poor tracking performance, low efficiency, and low precision, the present invention provides a control system that can suppress interference in time and better A high-purity control system and method for an air separation energy-saving process that effectively handles coupling problems, has good tracking performance, high efficiency, and high precision

Method used

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  • High-purity control system and method of air separation energy-saving process
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  • High-purity control system and method of air separation energy-saving process

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Embodiment 1

[0060] refer to figure 1 , a high-purity control system for air separation energy-saving process, including on-site intelligent instrument 2 directly connected with air separation tower 1, storage device 4 in DCS system, control station 5 and upper computer 6, wherein intelligent instrument 2, storage device 4. The control station 5 and the upper computer 6 are connected in sequence, and it is characterized in that the upper computer 6 realizes the function of the high-purity controller, solves the high-purity control law, and outputs the changed value of the control variable. The described controller includes a component inference module, a model parameter Adaptive correction module, high-purity control rate solution module for air separation and energy-saving process;

[0061] Described component deduction module 9 is characterized in that host computer 6 obtains the temperature that smart meter 2 detects, and the component concentration at each tray place of tower on the pr...

Embodiment 2

[0084] refer to figure 1 and figure 2 , a high-purity control method for an air separation energy-saving process, said control method comprising the following steps:

[0085] 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;

[0086] 2) Set the control law parameter K 1 , K 2 , K 3 , K 4 and the liquid-phase light component concentration setting value X of nitrogen and oxygen at the top of the upper column 1，N * , X n，O *

[0087] 3) Detect the upper tower pressure P(k) at sampling time k, and the temperature T of each tray i (k), calculate the component concentration value of liquid nitrogen and liquid oxygen, the calculation formula is as formula (1) (2):

[0088] X i , N ( k ) ...

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Abstract

The invention provides a high-purity control system of an air separation energy-saving process, which comprises an in-site intelligent instrument and a DCS system, wherein the in-site intelligent instrument is directly connected with an air separation tower, the DCS system comprises a storage device, a control station and a host machine, the intelligent instrument is connected with the storage device, the control station is connected with the host machine, the host machine comprises a controller used for solving a control rule and outputting operation variable values, and the controller comprises an ingredient deducing module, a model parameter self-adapting correction module and a high-purity control rule solving module. The invention also provides a high-purity control method of the air separation energy-saving process. The invention provides the high-purity control system and the method of the air separation energy-saving process, which can timely inhabit the interference, can perfectly handle the coupling problem, and have the advantages of good tracking performance, high efficiency and high precision.

Description

technical field [0001] The present invention relates to the control design field of the air separation energy-saving process, in particular, relates to the high-purity control system design and method 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] Countries all over the world have invested a lot of manpower and material resources in the energy-saving research of the air separation process, and have done a lot of research on the process modeling and advanced control of the air separation process. Due to the complex dynamic characterist...

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