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Liquid air separation plant solutions

Liquid air separation plant solutions
Apr 06, 2022
Author: DEAR AST

Liquid air separation plant solutions

Most liquid air separation plant cold energy receiving stations have a peaking role, their use is generally for domestic gas or car refuelling, with high and intermittent periods of gas consumption, for example 1-2 hour peaks in the morning and midnight. If the liquid air separation plant vapourisation plant is intermittent, the plant will not operate continuously. The solution is based on the intermittent use of liquid air separation plant and is characterised by a low number of moving devices and high performance requirements for cyclic start/stop moving devices. The solution uses liquid air separation plant cold energy conversion units, which can be converted into liquid air or liquid nitrogen, and air separation make-up cold units using liquid air or liquid nitrogen. The air is pressurised by an air compressor, then adsorbed with water and CO2 through an adsorber, and then passes through a booster and an air compressor to exchange heat with LNG in a high-pressure plate, then through a liquid expander to lower the pressure into the storage tank, and then the liquefied air is concentrated in a set of air separation units for distillation.

The liquid air separation plant designed by DearAir Separation avoids interruptions during operation and also allows a significant reduction in investment.

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The liquefaction of gases can be divided into forward and reverse cycles. The forward cycle process is the absorption of heat from the higher temperature external heat source and the release of heat to the lower temperature external heat source. The reverse cycle is when the mass draws heat from a lower temperature external heat source and releases it to a higher temperature external heat source. The forward cycle converts heat energy into mechanical energy and the reverse cycle converts mechani...
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Distillation is using the different boiling points of the two substances to condense the mixed steam and vaporize the mixed liquid repeatedly to achieve gas separation. For a mixed liquid composed of two substances with different boiling points, when the heat absorption part evaporates, the volatile components will evaporate more, while the mixed steam will give off heat and partially condense, the non volatile components will condense more. If the saturated steam with higher temperature is mixed with the saturated liquid with lower temperature, the steam will release heat and partially condense, and the liquid will absorb heat part of it evaporates. If after a round of partial evaporation and partial condensation, the steam and liquid with higher concentration will contact with the steam and liquid with different temperature respectively, and then partial condensation and partial evaporation will occur again. This process will be repeated for many times, and finally gas separation
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