Page 266 - Packed bed columns for absorption, desorption, rectification and direct heat transfer

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Fig. 44. Cross section of arranged Raschig ring packing

The wood hurdle packing is constructed of boards, often cogged in their
bottom part. Because the wood is not very stable against corrosion, this packing
was used only in few cases usually in cooling towers. Nowadays they are
practically no more used.
It is very difficult to produce big blocks of ceramics. That is why the
ceramic packings with vertical walls are produced as separate pieces or small
blocks.
In Fig. 45 some constructions of ceramic blocks are presented.

Fig, 45, Some ceramic block structured packings: a- slit block; b- grid block; c- honeycomb
block.