Current efficiency before membrane replacement
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This post was last edited by sunjl1981 on 2013-1-6 at 21:55. Please share your company’s current efficiency before replacing the membranes, what model of membranes are used, and how long they have been in use Let’s exchange ideas with each other, haha hcbbs!! hcbbs
Our factory is planning to replace the membranes in March, one by one; after they’re replaced we’ll expose them to sunlight. The current efficiency is around 89%
Does everyone’s membrane still have over 95% efficiency after two years?
The key still lies in the way saltwater purification is handled and the skill level of the employees.
Let me start by talking about the Asahi Glass F8020 membrane used in our company. It has been in use for 3.5 years; before replacing it, the current efficiency was around 89%, and the voltage per cell was 3.23V at 16KA :D Everyone is welcome to participate!
Replaced the membrane after 3.5 years? It will be three years by the end of March, and we have no plans to replace the membrane yet. The worst circuit is the membrane of F8020, as the purity of chlorine generally does not reach 98%. At 16.2 KA currently, the average cell voltage is around 3.03 V.
This post was last edited by tclvjian on 2012-3-4 at 09:22. Our unit uses membrane model F-6801; due to power supply issues, the system was not put into operation until three months after the membrane was installed. After operating for less than two years, the electricity efficiency was around 93%, and using high-purity water for membrane cleaning has a significant impact on electricity efficiency. It’s better to install the membrane once all the conditions are met! ! In our company, we usually replace the membrane at 91-92% efficiency; it’s not cost-effective to keep using membranes with lower efficiency.
This post was last edited by tclvjian on 2012-3-10 at 09:36. Our facility uses Asahi Kasei F4401 membranes; after four years of operation, the current efficiency remains at 92%. A complete replacement of the membranes is necessary. To ensure a long service life for the membranes, it is important to maintain high quality of the brine, to have stable operational controls, and to regulate the amount of acid added to the electrolyzer in order to prevent membrane acidification. As long as the oxygen content in chlorine is within acceptable limits, there is no need to increase the amount of acid used. Our facility found that when the oxygen content in chlorine was around 0.5%, increasing the acid dosage by 100 L/H did not result in a significant reduction in oxygen content.
What electrolyzers fear the most is shutdown; the shutdown process is actually the charging and discharging process of the electrolyzer, while the washing process corresponds to the contraction and expansion of the ion membrane! I haven’t heard of any company in China that uses the F-6801 ion exchange membrane well! If anyone is using one that works well, could you please share it! Anyway, I personally feel that the current efficiency of the ion membrane in this model declines quite rapidly!
Using Asahi Kasei 4403D ion exchange membranes, with an electrical efficiency of around 91.5%; replacing the membranes is planned.
The F6801 type ion exchange membrane is in use currently for over two years; the current efficiency is between 95–96%, and the standard voltage ranges from about 2.9–3.0 V. During operation, it has been subjected to frequent start-stop operations as well as changes in load levels. The membrane has not yet been replaced entirely, but such a replacement is planned.