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PEM water electrolysis hydrogen production process
Release time:
2024-12-05
External pure water flows to the water tank through the water inlet. The water source is monitored in real time through the liquid level sensor, temperature sensor and water quality sensor in the water tank. When the water level is lower than the designed liquid level, the external water is replenished in time; when the water temperature is too high, the water in the water tank is discharged through the drain port and the water is refilled; when the water quality sensor detects that the resistivity of the water is less than the set value, the water in the water tank will pass through the deionizer to achieve the effect of reducing the resistivity.
The water pump sends the water in the water tank that meets the requirements into the electrolytic cell. Before entering the electrolytic cell, the real-time status of the water is monitored by the water quality sensor. If the resistivity of the water is less than the requirement of the electrolytic cell, the water will be sent back to the water tank through the deionizer again, and enter the electrolytic cell after the resistivity is appropriate; the pressure sensor monitors the pressure of the water entering the electrolytic cell in real time. When the pressure is too high, the control system will send a signal to let the water pump adjust the speed to reduce the water outlet pressure.
After pure water enters the anode of the electrolyzer, it will be electrolyzed into O2 and H+. Oxygen is directly discharged at the anode (it can be equipped with an oxygen storage system as required). H+ combines with water under the action of the electric field force to form H2O·H+, and reaches the cathode through the proton exchange membrane, absorbs electrons to form H2, and outputs it to the outside.
The hydrogen coming out of the electrolyzer enters the steam-water separator through the pressure sensor. Under the action of gravity inside the steam-water separator, the hydrogen with low density flows upward, and the water with high density enters the lower end of the steam-water separator and gathers. When the water level reaches a certain height, the solenoid valve opens and the wastewater flows out.
The hydrogen enters the buffer tank, which mainly buffers the incoming hydrogen, maintains pressure balance, prevents hydrogen from backflowing into the electrolyzer, and separates gas and liquid. The hydrogen with stable output pressure enters the drying tower again.
The hydrogen in the drying tower absorbs moisture in the hydrogen under the action of the molecular sieve, so that the output purity of the hydrogen can meet the requirements. At the same time, due to the continuous operation of the hydrogen production system, the molecular sieve is saturated with water absorption. Two drying towers are used for circulation purification. When one of the drying towers is saturated, the other drying tower intervenes and the saturated drying tower is used for water treatment. This cycle is repeated to ensure the stable operation of the purification and drying equipment.
The purified and dried hydrogen will be discharged into the hydrogen storage system when it reaches the designed dew point under the detection of the dew point analyzer. When the detected dew point is higher than the designed dew point of -70℃, the hydrogen will enter the drying tower again for drying treatment and be discharged after passing the test.
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