Design intention of DN25 pipelines installed outside the bubble layer of the three-stage sulfuric acid drying tower
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As the title suggests, the chlor-alkali process packages are more or less similar across different companies. I would like to ask everyone: in the three-stage sulfuric acid drying tower, the medium used is 98% acid; in the composite tower, there is a bubble cap layer at the top and a packing layer at the bottom. It’s possible that some companies name a section as a drying tower without any actual difference. I would like to ask what the intention is behind having many externally connected DN25 pipelines in the blister layer Douban: I haven’t been here for a long time. Could you help clarify things?
Drain the acid from within the tray during shutdown for maintenance. Due to the residual weir, there is a certain amount of acid at a certain height within the tray
Experts upstairs! Once you see its structure, it’s easier to understand.
If a DN25 pipe is not directly connected to the tower, but is instead closely fitted at the flange of the tower section and connected to a protective cover, it is used to carry away any minor leaks of chlorine from that tower section; it is usually connected to a fan. The conventional design for discharging sulfuric acid from the tray involves using the pre-existing holes in the tray; during normal operation, a rod that is higher than the overflow weir is screwed in to block these holes.