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Method for preventing and controlling nitrogen blockage of argon preparation system of space division device

An air separation device, prevention and control technology, applied in the sequence/logic controller program control, cold treatment separation, refrigeration and liquefaction, etc., can solve the problems of lack of automatic prevention and control of nitrogen plug control methods, etc., to achieve convenient online calculation, Effect of overcoming influence, satisfactory control effect

Inactive Publication Date: 2010-01-27
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

[0006] What the present invention aims to solve is the problem that the current air separation industry lacks a set of effective automatic control methods for preventing and controlling nitrogen plugging

Method used

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  • Method for preventing and controlling nitrogen blockage of argon preparation system of space division device
  • Method for preventing and controlling nitrogen blockage of argon preparation system of space division device
  • Method for preventing and controlling nitrogen blockage of argon preparation system of space division device

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing and by embodiment the present invention will be further described:

[0035] The structure diagram of the control principle of the nitrogen plug in the argon system of the air separation unit of the present invention is as follows figure 2 As shown, it is by selecting the measured values ​​of the argon content of the argon fraction, the argon fraction temperature, the argon content at the top of the crude argon tower II and the product oxygen purity as controlled variables (CVs), wherein the argon content of the argon fraction, The temperature of the argon distillate is used as the first line of defense to monitor whether nitrogen plugging occurs in the argon production system, and the argon content at the top of the crude argon tower II is used as the second line of defense. The stability of the working conditions is the most fundamental means to prevent nitrogen plugging in the argon system; the amount of oxygen taken out...

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Abstract

The invention discloses a method for preventing and controlling the nitrogen blockage of an argon preparation system of a space division device, which comprises the following steps: selecting measurement values of all important indexes of the argon content of an argon fraction, the argon fraction temperature, the argon content of the top of a rough argon tower II and the oxygen purity of a product as controlled variables, wherein the argon content of the argon fraction and the argon fraction temperature are used as a first defensive line for monitoring nitrogen blockage, the argon content of the top of the rough argon tower II is used as a second defensive line, the two defensive lines are used for directly and accurately reflecting whether the argon preparation system generates the nitrogen blockage or not, and the oxygen purity of the product is used for reflecting whether the working condition of a main tower is stable or not; selecting the oxygen taking content, the pure liquid nitrogen reflux amount of an upper tower and the rough argon extraction content as operation variables; and calculating the optimal control increment of all the current operation variables by a predicting control algorithm so as to adjust the working condition of the rectification of the main tower and the argon system. The invention can monitor and adjust the change of the content of oxygen, argon and nitrogen of the argon system in real time under a steady working condition and variable load and effectively prevent and process the nitrogen blockage of the space division device fundamentally.

Description

technical field [0001] The invention belongs to the technical field of air separation control engineering, and in particular relates to a method for preventing and controlling nitrogen plugging in an argon production system in the air separation production process. Background technique [0002] Argon is the most abundant noble gas in the air. figure 1 A process for producing argon by air separation is given. The raw material air is rectified in the low-pressure column of the main column, and the product nitrogen will be obtained at the top of the column, and the product oxygen will be obtained at the bottom of the column, and an argon enrichment zone will be formed in the stripping section. The extraction of argon is to extract a certain amount of gas-phase argon fraction from the middle and lower part of the low-pressure tower, and enter the crude argon tower for rectification. Due to the large number of plates in the crude argon column, the height of the column is not con...

Claims

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Application Information

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IPC IPC(8): G05B19/04F25J3/04
CPCF25J3/04412F25J3/04678F25J3/04703F25J3/04727F25J3/048F25J3/04963F25J2235/58
Inventor 李华银赵均徐祖华钱积新
Owner ZHEJIANG UNIV
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