I need a purging plan for the electrolysis section. Could you please check which HaiChuan friend has it? I’ll check it out.
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This post was last edited by sunjl1981 on 2013-1-6 at 23:38. I am looking for a commissioning plan for a project involving 200,000 tons of caustic soda and polyvinyl chloride; we have prepared one ourselves but would like to find another one for comparison. Additionally, we are currently preparing to purge the pipelines, and I need a purging plan for the electrolysis section. If any of you from Haichuan have it, please send one copy. I’ll check it out. The information has been very helpful to me; a reward of up to 200 wealth points will be given. Thank you! ! My email address: kjb8853@163.com # + + .
I would like to know whether you produce 200,000 tons of caustic soda using the diaphragm process or the ion exchange membrane process? We produce products using the ion membrane process; if you need it, I’ll send you a copy tomorrow
Reply 2# zgl1982: It is the ion exchange membrane method
Does no one have this information?
Electrolytic nitrogen purging scheme? 1. For D290, it is as if water is being filled into D290; when the LIC-290 level reaches 90%, nitrogen is supplied to D290 via FI-299 at a rate of 10 m3/h. 2. D270 and D273: Nitrogen is supplied to D270 via FI279 at a rate of 50 m3/h for over 20 minutes. D270----D273-----H2 main pipe------PICZA226------H2 treatment.
3. Cathode solution overflow line: Nitrogen is supplied to D270 via FI279 at a rate of 20 m3/h for over 10 minutes. D270-----Caustic soda main pipe-----6#-----8#----D290-----Vent.
4. H2 main pipe and top pipelines of the cathode circulation tank: Nitrogen is supplied to D270 at a rate of 20 m3/h, and it is vented at the same rate. D270-----H2 main pipe----12#-----14#----Vent (sampling and analysis at valve 56#).
5. H2 pipeline: Nitrogen is supplied to D270 via FI279 at a rate of 50 m3/h. D270----H2 main pipe----PICZA226-----H2 treatment. The duration of nitrogen supply mentioned above is determined based on the results of sampling and analysis; if the oxygen content is less than 1%, it is considered acceptable (sampling and analysis carried out at valve 56#, during H2 treatment). I hope this helps!
3. Cathode solution overflow line: Nitrogen is supplied to D270 via FI279 at a rate of 20 m3/h for over 10 minutes. D270-----Caustic soda main pipe-----6#-----8#----D290-----Vent.
4. H2 main pipe and top pipelines of the cathode circulation tank: Nitrogen is supplied to D270 at a rate of 20 m3/h, and it is vented at the same rate. D270-----H2 main pipe----12#-----14#----Vent (sampling and analysis at valve 56#).
5. H2 pipeline: Nitrogen is supplied to D270 via FI279 at a rate of 50 m3/h. D270----H2 main pipe----PICZA226-----H2 treatment. The duration of nitrogen supply mentioned above is determined based on the results of sampling and analysis; if the oxygen content is less than 1%, it is considered acceptable (sampling and analysis carried out at valve 56#, during H2 treatment). I hope this helps!
Is there detailed information available? It would be great if you could send it to me, thank you； Email: xjzhb001@sohu.com
If you have all the detailed information, I would also appreciate it if you could send it to me. Thank you； Email: tsjun2346@126.com
Air purging steps for the cathode system: a. Purging of the cathode D-290 tank and the drainage pipelines: (a) If conditions permit, fill tank D-290 with water (alkali) to 90%. (b) Fill tank D-290 with nitrogen via FI-299, maintaining a nitrogen flow rate of 10 Nm3/h; once the air purging is complete, the nitrogen flow rate can be reduced appropriately. (c) Fill the cathode vent line with nitrogen via FI-299, controlling the nitrogen flow rate at 10 Nm3/h; once the air blowing test is successful, the nitrogen flow rate can be reduced appropriately. b. Air purging of cathode circulation tank D-290 and cathode sump D-273: Nitrogen is supplied to cathode circulation tank D-270 via FI-279, with a nitrogen flow rate of 50 Nm3/h and purging lasting at least 20 minutes; once the air purging is complete, the nitrogen flow rate can be reduced appropriately. (if the nitrogen flow rate is insufficient, the nitrogen supply valve for the hydrogen main pipe can be adjusted accordingly) c. Nitrogen filling in the cathode liquid phase line: Nitrogen is supplied to the cathode circulation tank D-270 via FI-279; the nitrogen flow rate should be maintained at 50 Nm3/h, and the filling process should continue for at least 10 minutes. Once the air purging is complete, the nitrogen flow rate can be reduced appropriately. d. Air purging of the bulk phase pipelines at the top of the hydrogen main pipe and the cathode circulation tank: Nitrogen is fed into cathode circulation tank D-270 via FI-279, with a nitrogen flow rate of 50 Nm3/h; this process should be carried out for at least 10 minutes. Once the air purging is complete, the nitrogen flow rate can be reduced appropriately. (Note: Analyze O2/N2 at the sampling port on the hydrogen main pipe)
Cathode gas sampling and analysis can be carried out at valve 56#
The other pipelines are straightforward; the main tasks are detecting leaks and cleaning. Rinse with water and conduct a pressure test with water. Another method is to use compressed air or steam (at a certain temperature) to clean the pipes and conduct pressure tests for leaks! The reason for including temperature is to prevent some pipes from operating at temperature, as this can lead to dew points over time! (The so-called overpressure refers to a pressure that exceeds the specified level)
There is no purging scheme for the anode; instead, the 85# valve on the electrolyzer is opened to allow water to circulate externally for flushing. Purging is not required!