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Enthalpy during oxygen production

Enthalpy during oxygen production
Aug 17, 2022
Author: DEAR AST

The sum of the kinetic energy of the irregular movement of molecules in a substance and the potential energy generated by the mutual attraction between molecules is called thermodynamic energy. In the process of oxygen production, there are often flow processes such as compression, expansion, heating and cooling. These processes not only involve the change of material thermodynamic energy, but also involve the transformation between material flow energy and thermodynamic energy. Han is the sum of material thermodynamic energy and material flow, so it is more convenient to study these flow processes with Han.

In the kdon-300 / 3000 (100y) air separation equipment supplied by Kaifeng DEAR air separation plant to Shandong Kenli Petrochemical Company, deer design and Research Institute independently developed a remote optimization control and diagnosis system for large-scale air separation plant. The system includes eight modules, including a continuous vibration sampling and analysis module; Field dynamic balance software module; Unit online monitoring module and unit vibration self diagnosis module; Electrical fault diagnosis module; Intelligent air separation bearing library module; Simulated fault training module; Noise signal detection power module. It has the functions of on-site analysis, fault discrimination, data management, trend analysis, etc., and integrates the experience of on-site analysis and diagnosis. It is flexible, convenient and easy to operate.

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The amount of liquid nitrogen removed from the lower column of the air separation unit will affect the purity of the liquid nitrogen in the lower column and the oxygen enriched liquid air at the bottom of the column. When the liquid nitrogen removal amount of the lower column increases, the reflux liquid participating in the heat and mass exchange of the lower column will be reduced, the temperature rise of the rising steam on the column plate will be correspondingly reduced, the condensation of the rising steam will not be sufficient, the oxygen component will be condensed less, the purity of nitrogen at the column top will be reduced, and the purity of liquid nitrogen will be naturally reduced. At the same time, the temperature rise of the downflow liquid will increase, the liquid evaporation will be more sufficient, more nitrogen components will be evaporated to the top of the column, and the purity of the liquid air at the bottom of the column will be improved accordingly.
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