Regarding the operation of the 8 valves when filling the Asahi Kasei electrolyzer
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This post was last edited by sunjl1981 on 2013-1-6 at 20:14. Please take a look at these operating procedures: 1. Ensure that the oil pressure at the slot head is 705 MPa, and that the nut is 2 mm away from the electrolytic cell. 2. Start the P-344 pure water pump to supply 0.05–0.1 MPa of pure water to the electrolysis process. 3. Open the anode side ； 13 Anode accident chlorine valve, 17 Anode solution outlet vent valve, 27 Anode solution balance valve. Cathode side: 8 catholyte outlet drain valves, 14 cathode hydrogen outlet valve, 10 cathode hydrogen outlet valve, 16 hydrogen outlet exhaust and nitrogen purge, 18 cathode nitrogen water seal drain valve, 28 valve. A: Injection of pure water into the anode and cathode chambers 1. First, open the anode pure water injection valve (32) and the cathode pure water injection valve; maintain a flow rate of 25 m3/h. When the pressure in the cathode chamber is 0.2–1 mH2O higher than that in the anode chamber, open the anode pure water injection valve (31) and keep the flow rate at 25 m3/h. 2. When pure water overflows from the cathode outlet, reduce the flow rate of the cathode pure water inlet valve 32 to 15 m3/h. When overflowing from the anode outlet, reduce the 31 anode pure water injection valve and lower the flow rate to 15 m3/h. 3. When pure water overflows from the 16 cathode outlet vent and the nitrogen displacement valve, close valves 32 and 16; when pure water overflows from the 17 anode liquid outlet vent, close valves 31 and 17. 4. Close the anode accident chlorine valve 13, anode liquid balance valve 27, cathode hydrogen outlet valve 10, and valve 28, and raise the oil pressure to 9 MPa. 5. Both persons simultaneously open the 31 anode pure water injection valve and the 32 cathode pure water injection valve, raise the inlet pressure to 0.05 MPa, and then close them. 6. Check for leaks in the hoses at the inlet and outlet of the electrolytic cell, as well as around the cell. I would like to ask everyone: the procedures mention opening valve 8. Valve 8 is located between valves 4 and 6, which are not opened. What is the purpose of opening valve 8 then? In the procedures, where is valve 13 located? Is it between valves 9 and 10, or in front of valve 9? What is the difference between valve 15 and valve 13? # ， ， &
Valve 8# is opened to prevent thermal expansion and contraction; valves 4# and 6# are installed as a tee to avoid pressure buildup, and this is also done to prevent caustic soda from flowing back in case valve 6# does not close properly. Valve 13# is the valve that leads to the emergency chlorine supply, located near the electrolyzer; Valve 15# is the valve that leads to the emergency chlorine supply on the pipe tee between Valves 9# and 11#. Valve 15 is designed to prevent chlorine in the system from flowing back into the electrolyzer when Valve 11 cannot be closed properly; therefore, as long as the electrolyzer is shut down and Valves 9 and 11 are closed, Valve 15 remains open until it is closed at the time of switching before establishing the gas phase connection. Last edited by sister on 2009-3-6 00:50]
Thank you for your reply. Below the anode separation box, it’s the same as the cathode side – there is also a tee at valve 5. Then why doesn’t the middle valve open? I would like to ask whether, in your actual operations, the 8 valves are used in accordance with the specified operating requirements? This post was last edited by nanren2 on 2009-3-6 07:07.]
Valve 5# leads to D260 in the electrolytic cell, while Valve 29# leads to D280. There is no valve similar to valve #8. Valve 8# remains open during shutdown, and stays closed after power is restored during operation; it does not require frequent operation. So it must have been operated according to the procedure.
Your device is different from the current one
What the original poster is asking is about the purpose of valve #8, right? Close valve No. 4 and 6, and open valve No. 8 in order to completely sever the connection between the electrolyzer cathode system and the main hydrogen pipeline, ensuring the safety of the cathode system. In our view, having two valves is already sufficient for safety, but the Japanese pursue even safer operations.
No. 8: It mainly serves a safety purpose, and it also includes the nitrogen outlet for nitrogen displacement! Same as what the poster on floor 6 said! :lol