The feed pipe of the electrolytic cell is blocked
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This post was last edited by sunjl1981 on 2013-1-6 at 23:38. Possible causes of blockage in the electrolyzer feed pipe: Our factory has recently encountered problems with blockages in the feed pipes; the blockages have been sent for analysis, and it is suspected that they are caused by corrosion products from the hydrochloric acid tank. # ， ， &
If the cause cannot be identified, it might be worth considering whether there is a problem with the resin filter – broken resin may have gotten through. If such broken resin causes a blockage, the color of the blockage is usually yellow or dark red.
It’s not broken resin; its outer surface is yellow-green while the interior is black, similar to carbon residue after combustion. It’s not clear what it is, as the electrolyzer has been in use for over a year.
Do your inlet pipelines have filters?
Chlorine engineering cells have corrosion-resistant electrodes; they are similar to filters and can serve as filters
If the blockage is found in the hose but not in the filter, it might be a problem with the sacrificial electrode. If the blockage is found in the filter and the resin filter is fine, then the issue is likely related to the hydrochloric acid pipeline. By the way, what material is your saltwater pipeline made of? Corrosion and detachment can also occur if the material of the saltwater pipeline is not suitable.
For steel-lined PTFE pipelines, the blockage is present in the inlet pipe of the unit tank; it does not seem to be caused by delamination of the lining. Why then is there a substance that resembles carbon slag?
It is formed by the corrosion and detachment of the rubber lining or rubber gaskets in the saltwater pipeline.
Generally speaking. Whether it is acid added to the anode or the anode solution itself. It is inevitable that it will pass through the filter at the anode inlet. If the hose in a single cell becomes blocked, the first thing to consider is whether there are problems with the gaskets in the electrolyzer, etc. Moreover, the PTFE-lined steel pipes you use have an additional inner lining, which makes it even more difficult to carry out inspections. If it runs like this for a long time. There is a possibility that the pipes could be corroded through.
The pipeline lining may peel off, or there may be corrosion on the gaskets; clean the cathode filter screen and inlet hose once a month
It is recommended to replace the salt water pipelines with stainless steel, and to thoroughly clean the system before operation in order to remove all slag and debris.
Stainless steel pipes are prone to corrosion in saline systems; titanium materials should be used instead
I think it’s either weld slag that wasn’t thoroughly removed during cleaning inside the pipe, or impurities from hydrochloric acid.
Is it weld slag inside the pipeline, or something used as a lining on the steel-lined pipeline?
Our plant’s electrolyzers are under maintenance, and it was found that many black solid lumps were trapped in the cathode inlet filter; analysis showed that they were weld slag from the pipes
Stainless steel is definitely not suitable for salt water pipelines; in the ion exchange membrane process, stainless steel exposed to free chlorine gets completely corroded within a few days. Titanium can be used, but it’s too expensive, so it’s not chosen. Generally, CPV+FRP or steel-lined F4 is used. Our factory has also encountered problems with blockages in the saltwater supply pipes; it was later found that the free chlorine level in the saltwater was above the permissible limits on several occasions, which led to the peeling off of the rubber lining in the saltwater delivery pipelines.