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Effective energy analysis of cold energy utilisation in liquid air separation plants

Effective energy analysis of cold energy utilisation in liquid air separation plants
Jul 18, 2024
Author: DEAR AST

Effective energy analysis is an important analytical method for energy systems. Liquid air separation plant is a low-temperature liquid mixture with methane as the main component, including nitrogen, ethane, propane and other components, which has a large temperature difference and pressure with the outside world. Liquid air separation plants's temperature accompanied by phase change heat, so its cold energy is divided into sensible heat and latent heat. The effective energy analysis shows that when the pressure is certain, the ambient temperature difference increases and the effective energy of the liquid air separation plant cold increases, when the temperature is certain, as the pressure of the liquid air separation plant increases, the effective energy of the pressure increases, but the effective energy of the low temperature decreases. One of the reasons for this is that as the pressure increases, the bubble point of the liquid mixture rises and the temperature difference between it and the environment decreases, and as the pressure increases, the latent heat of vaporisation of the liquid mixture nears the critical zone decreases.

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In the upper column fractionation, below the liquid air inlet is called the stripping section, and above the liquid air inlet is called the distillation section. The stripping section realizes the separation of oxygen and argon, and the distillation section realizes the separation of oxygen and nitrogen. Because the boiling points of oxygen and argon are relatively close, the separation is difficult. In order to ensure the purity of oxygen, the separation of oxygen in the distillation section is not clean, and argon escapes with oxygen and nitrogen. If high purity nitrogen is to be obtained, argon will condense with oxygen in the distillation section, which will affect the purity of oxygen. In order to ensure the purity of oxygen and obtain high purity nitrogen, it is necessary to extract part of the gas with high argon concentration in the distillation section.
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