Variable load control and optimization method for air separation liquefaction device

A technology of liquefaction device and optimization method, applied in design optimization/simulation, special data processing application, geometric CAD, etc., can solve the problems of waste of energy consumption, difficult control of variable load process, gas emission of pipeline network, etc.

Pending Publication Date: 2021-09-10
ZHEJIANG UNIV OF TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] In order to overcome the difficulties in controlling the variable load process of the air separation plant in the prior art, easily causing excess pipe network gas to disperse, and causing waste of energy consumption, the present invention provides a variable load control and optimization method for the air separation plant. The realization process is simple, the operation is convenient, and it has better economic value

Method used

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  • Variable load control and optimization method for air separation liquefaction device
  • Variable load control and optimization method for air separation liquefaction device
  • Variable load control and optimization method for air separation liquefaction device

Examples

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Embodiment 1

[0071] Taking medium-pressure nitrogen feed at 313K with a pressure of 24.44atm (the pressure fluctuates between 1.6MPa-2.5Mpa) as an example, the operating pressures at the compression end BC1 and BC2 of the high-temperature expander at steady state are 33atm and 14.2atm respectively; The operating pressures of ET1 and ET2 are 10atm and 1.35atm respectively; the temperature of multi-stream heat exchange outlet streams 1-4 is about 200K, and the temperature of 1-12 is about 139K. The total flow of nitrogen from the pipe network is 15000Nm3 / h, of which 2700Nm3 / h nitrogen directly enters the nitrogen channel of the main heat exchanger to exchange heat with the return gas, liquefies in the main heat exchanger, cools down to 81.1K, and throttles through the V6y valve After reaching about 3atm, it will be sent out as a product. Based on this working condition, the equivalent heat exchange network parameters of the multi-stream heat exchanger are estimated. The parameters of the eq...

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Abstract

The invention discloses a variable load control and optimization method for an air separation liquefaction device. The method comprises the following steps: 1) establishing a process model according to a field process of the air separation device; 2) determining parameters of each device in the process model by using field working conditions of the air separation unit; 3) establishing an equivalent heat exchange network to replace a multi-stream heat exchanger model by using an SW superstructure modeling method; 4) establishing an economic optimization proposition based on the equipment operation flexibility and the device production condition; 5) listing boundary conditions related to key operation variables of the air separation unit; 6) taking the air separation unit simulation data as a sample set, and establishing a proxy model of the key operation variables by adopting a CAD method; and 7) solving an optimal proposition. According to the variable load control and optimization method for the air separation device, the implementation process is simple, operation is convenient, and better economic value is achieved.

Description

technical field [0001] The invention relates to the simulation and operation optimization of chemical process. In particular, it relates to a control method for determining the variable load operating point of an air separation plant Background technique [0002] The air separation unit separates and produces oxygen, nitrogen, and helium in the air through technologies such as low-temperature liquefaction, and is widely used in many fields such as petroleum and metallurgy. In actual production, the air separation plant needs to meet the user's periodic, intermittent and staged gas demand through variable load operation. How to quickly search for the operating point that satisfies the flexible requirements of load operation control and optimal economy on the premise of ensuring the product is qualified is an important issue in air separation research. [0003] The coupling of the air separation unit is strong, and the feasible range of operating variables is small. The ope...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F30/10
CPCG06F30/20G06F30/10
Inventor 祝铃钰刘正邦姚润杰章渊昶
Owner ZHEJIANG UNIV OF TECH
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