Material selection for HCL exhaust gas absorption tower
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This post was last edited by zcy5026 on 2018-2-26 at 14:14. HCL exhaust at 2000 ppm is absorbed using NaOH solution under design conditions of 1.0 MPaG and 150°C. Carbon steel lining for the cylinder. How should the materials for the internal components be selected: tray plates, lift pipes, and liquid distributors? It is planned to use stainless steel tubes for the bottom heat exchange tubes – is there any problem with that?
If the operating temperature is not high, i.e., at room temperature, it is recommended to use titanium. If stainless steel is not handled properly and the alkali is not replenished in time, problems will arise.
The cost is way too high. What materials are actually used for the filler scrubbers in hydrochloric acid exhaust gas treatment in actual production?
Why isn’t this hydrogen chloride exhaust gas considered for direct absorption with water to produce hydrochloric acid as a by-product?
Just choose non-metallic materials! Fiberglass, PVC, and CPVC are all fine!
Modified PVC with graphite added; consider using all graphite at high temperatures
On the one hand, the HCL concentration is low; on the other hand, there are subsequent devices, so the required HCL concentration after washing cannot be too high
The trays made of PVC don’t have enough strength, right?
Using graphite is a safer option.