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Why does the time it takes for the oxygen concentrator of the air separation equipment to accumulate liquid during startup differ

Why does the time it takes for the oxygen concentrator of the air separation equipment to accumulate liquid during startup differ
Dec 05, 2023
Author: DEAR AST

The process of accumulating the necessary low-temperature liquid for distillation in a distillation tower is actually a process of storing cold energy. The cooling balance relationship during this process is: total cooling capacity=total cooling loss+cooling capacity required for liquid accumulation

For the same oxygen concentrator, the amount of accumulated liquid required is the same, so the required cooling capacity is also the same. However, the total cooling capacity and total cooling loss of an oxygen concentrator are related to specific conditions, and sometimes there is a significant difference. It is related to the installation, maintenance quality, and operation during the start-up phase of the oxygen concentrator.

The time it takes to accumulate liquid is also related to the heating of the equipment (including the heating of the insulation layer) before startup, as well as whether the equipment and insulation layer inside the cooling tower cool evenly and thoroughly after startup. If the temperature is too high at the end of heating and the cooling stage is not fully cooled, the liquid that appeared earlier will evaporate a large amount after being injected into the upper tower. At the same time, the heat stored in the insulation layer (the amount of cooling required to cool the insulation layer is often greater than the amount of cooling required for the entire liquid accumulation stage) continues to flow into the tower, causing the liquid level to remain stagnant or rise slowly, prolonging the time required for this stage.

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