| 摘要 |
<p>A distillation column 30 for separating atmospheric gases in which structured packing having varying crimp angles is utilized within at least two of the sections I to IV or in subsections of a single one of the sections I to IV. In the case of the use of structured packing in multiple sections, the crimp angle of the structured packing used in a first section is greater than that used in a second section and is selected such that both sections operate at the same maximum design percentage of flooding limit. The increased crimp angle of the first section decreases the HETP of the packing and thereby allows a column design of reduced height. Structured packing having different crimp angles can be used in a single section of a column when such section is subjected to possible variation of vapour rate. Here the crimp angles are again selected so that the subsections operate at the same maximum design percentage of flooding limit. The distillation column 30 is thus able to operate with improved turndown performance. <IMAGE></p> |
