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Non-equilibrium energy-saving control system and method for air distillation tower

An energy-saving control system and technology of energy-saving control, applied in the field of air separation, can solve the problems of high unit energy consumption and poor energy-saving performance

Inactive Publication Date: 2010-07-14
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 disadvantages of large unit energy consumption and poor energy saving performance of the existing air separation industrial process, the present invention provides a method to control the unit energy consumption of the air separation tower by making the unbalanced energy saving of the air separation tower under the current production conditions. Air separation tower unbalanced stage energy saving control system and method with minimum and improved energy saving

Method used

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  • Non-equilibrium energy-saving control system and method for air distillation tower
  • Non-equilibrium energy-saving control system and method for air distillation tower
  • Non-equilibrium energy-saving control system and method for air distillation tower

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Embodiment 1

[0184] refer to figure 1 , figure 2 , image 3 , an air separation tower unbalanced level energy-saving control system, comprising an on-site intelligent instrument 2 connected to an air separation tower 1, a data interface 3, a control station 4, a database 5 and a host computer 6, the intelligent instrument 2 is connected to a field bus, and the Field bus is connected with data interface 3, and data interface 3 is connected with control station 4, database 5 and host computer 6, and described host computer 6 comprises:

[0185] The signal acquisition module 7 is used to collect current production working condition data;

[0186] The energy-saving control module 8 is used for energy-saving control, and the following process is used to complete:

[0187] 1) Set the structural parameters and operating parameters of the tower, and specify the initial value of the feed air flow;

[0188] 2) Assume that the main composition of the liquid phase of each tray, the flow rate of the...

Embodiment 2

[0297] refer to figure 1 , figure 2 , image 3 , an air separation tower unbalanced level energy-saving control method, the unbalanced level energy-saving control method comprises the following steps:

[0298] 1) Set the structural parameters of the tower, collect the production condition data of the tower, and collect the current feed air flow rate as the initial value;

[0299] 2) Assume that the main composition of the liquid phase of each tray, the flow rate of the vapor-liquid phase, and the temperature of the tray;

[0300] 3) For each tray, calculate the liquid phase mass transfer flux:

[0301] L j - 1 x i , j - 1 + F j L z i , j L - ( ...

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Abstract

The invention discloses a non-equilibrium energy-saving control system for an air distillation tower, which comprises a field intelligent instrument connected with the air distillation tower, a control station, a database and an upper computer, wherein the upper computer comprises a signal acquisition module and an energy-saving control module. A process comprises the following steps: setting structural parameters and operating parameters of the tower, and specifying an initial value of feeding air flow; assuming components of a liquid-phase main body, the vapor-liquid flow, and the temperature of each tower plate; calculating the mass transfer rate of a liquid phase, the components of a vapor-phase main body, enthalpies of the vapor-phase main body and the liquid-phase main body, effective mass transfer coefficients of the vapor phase and the liquid phase, components of a liquid-phase interface, the equilibrium temperature and the components of a vapor-phase interface; if a judgment condition is met, continuing, otherwise updating the parameters of each tower plate; and if the purity and the yield do not meet the requirement of the current production working condition, finishing iteration and outputting a result, otherwise adding an iteration step to the feeding air flow. The invention also provides a non-equilibrium energy-saving control method for the air distillation tower. The system and the method make the air distillation tower have minimum specific energy consumption and improve the energy-saving property under the current production working condition.

Description

technical field [0001] The invention relates to the field of air separation, in particular to an energy-saving control system and method for an unbalanced stage of an air separation tower. Background technique [0002] Oxygen, nitrogen and argon are used in a wide variety of applications. Oxygen can be used in steel manufacturing, chemical technology, metal processing, glass manufacturing, oil recovery and refining, paper making, health care services, aerospace defense, etc. Nitrogen is widely used as a protective gas in the metallurgical industry, oil recovery and refining, metal production and processing, electronics industry, and chemical industry. Argon is used as shielding gas in aircraft manufacturing, shipbuilding, atomic energy industry and machinery industry, and also has very important applications in electronics and lighting industries. The low-temperature air separation method is to use the difference in boiling points of oxygen, nitrogen, argon and other compo...

Claims

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Application Information

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IPC IPC(8): G05B19/418
CPCY02P80/10Y02P90/02
Inventor 刘兴高
Owner ZHEJIANG UNIV