Do you ever wonder how a hydrogen electrolyzer works? The idea is to split water into hydrogen and oxygen, using electricity. In this diagram, water is fed into the electrolyzer, after being pumped and cooled. Then, at the anode site, oxygen is produced and separated out in the Oxygen/water separator. While at the cathode side, hydrogen is produced. The high pressure hydrogen is separated out in the high pressure separator. After a pressure reduction valve, additional low pressure hydrogen is produced and the water is recycled back to the oxygen/water separator.
Let us take a deeper look at the electrolyzer. This electrolyzer assumes 0.11% water is converted into hydrogen. It has 100 cells for each stack and there are a total of 10 stacks in parallel. To produce each kg hydrogen, it requires about 48 kWh. For each cell, the voltage is about 1.8 Volts. About 1.47 Volts are useful, while the overpotential voltage of about 0.33 Volts is wasted. With 100 cells in the stack, the stack voltage is about 180 Volts. with a total of 10 stacks in parallel, the electrolyzer power consumption is about 1768 kW. The hydrogen produced is about 36.7 kg/h.
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