Alkali scrubber tower in ethylene plant
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In the ethylene plant, in addition to the acid gases, there is an alkali scrubber tower; absorption is carried out using alkalis of different concentrations, with each section having its own circulation pump； I’m not quite sure how gases manage to pass through the various liquid sections, and how the liquid level in each of these sections is controlled Please explain it to us.
I haven’t done it. Theoretically, the alkali scrubber tower consists of a water washing section and an alkali washing section; some of the water washing sections are made up of bubble cap trays or floating valve trays, while the alkali washing section is a packing layer. Rums seem to be all packed with filler layers. Gases pass through the scrubber tower in the same way they pass through the alkali scrubber tower. The suction inlet for each pump is located at a small groove similar to an overflow weir; the liquid level is presumably controlled by the alkali concentration. Just take a look at the equipment drawings and it will be clear!
I’ve never worked with ethylene, but washing towers are more or less the same – they have an alkali washing section and a water washing section, with a packing layer in each section. Below the packing layer is a collector, and a liquid dropping device is installed to control the liquid level; when the level reaches the height of the overflow weir in the liquid dropping system, the liquid overflows.