The behaviour of oil films on structured packing under cryogenic conditions

Gas Separation & Purification Pub Date : 1995-01-01 DOI:10.1016/0950-4214(95)92176-D

Anton Kirzinger, Karl Baur, Eberhard Lassmann

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引用次数: 2

Abstract

Today structured packing is commonly applied in cryogenic air separation plants. Packing is typically characterized by a high surface-to-volume ratio. Owing to the large surface of packing in comparison to common sieve trays — provided equal amounts of oil are attached to surfaces — more organic material may be present within a low-pressure column of an air separation plant. Since an enrichment of organic material in an air separation plant or in liquid oxygen is a principal hazard, and a major accumulation of organic material magnifies this risk, experimental tests were conducted to determine whether chipping of oil at cryogenic temperatures is possible.

Tests are discussed where single sheets of a packing segment had been coated with an oil film of definite thickness. The oil-coated sheets were rinsed by moving them up and down in liquid nitrogen or in liquid oxygen. After fixed time intervals the oil content of a single sheet was determined.

It was concluded that the original oil residue on the sheets up to 250 mg m⁻² remained attached to the packing surface and no decrease of oil was found within the accuracy of the oil determination method.

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低温条件下结构填料上油膜的行为

目前，结构填料已广泛应用于低温空分装置中。填料的典型特点是表面体积比高。由于填料比普通筛盘表面积大，如果表面附着等量的油，那么在空分装置的低压塔内可能存在更多的有机物质。由于在空气分离装置或液氧中有机物质的富集是一种主要危险，而有机物质的大量积累会放大这种危险，因此进行了实验测试，以确定是否有可能在低温下对油进行切屑。讨论了在单片填料段上涂有一定厚度的油膜的试验。在液氮或液氧中上下移动涂有油的薄片进行冲洗。在固定的时间间隔后，测定单片的含油量。结果表明，当含油量达到250 mg m−2时，原始的油渣仍附着在填料表面，并且在含油量测定方法的精度范围内没有发现含油量的减少。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Gas Separation & Purification

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