Pressure control for the three-return-one system and the high-pressure tank of the new hydrogen compressor

1. Gases generate pressure, while liquids transmit pressure. Therefore, the pressure in the new hydrogen separation tank is generated by the gas entering the tank; when the amount of gas entering is high and the amount used is low, the pressure rises. At this point, the three return valves and one shut-off valve are adjusted to a smaller setting, and the pressure control valve opens in order to regulate the pressure in the tank ； The air intake is low while the air consumption is high, resulting in a drop in pressure; at this point, increase the adjustment of three returns and one opening to stabilize the pressure in the tank ； With the air intake volume remaining constant and the air consumption increasing, the pressure in the tank drops; by increasing the flow rate to three parts returning and one part going out, the tank pressure is stabilized. This is done to protect the components of the unit from damage, ensure safe operation, and maintain the pressure at the third stage of exhaust. Ultimately, it is also necessary to increase the air supply volume. At this point, the pressure to achieve high scores will decrease. Adjustment method: Slightly increase the ratio of three to one to stabilize the pressure in the new hydrogen tank. If this condition persists for a long time, it is necessary to reduce the amount of raw material processed; if required, the new hydrogen generator should operate at reduced capacity. 2. The pressure of the new hydrogen tank is controlled in cascade with the pressure of the high-pressure tank, following a 3-to-1 ratio. Adjustments must be made decisively after taking all consequences into account to ensure the stable operation of the device. 3. The pressure associated with high hydrogen levels is reflected in the system’s hydrogen partial pressure. Factors that affect this hydrogen partial pressure include the purity of the hydrogen gas, the volume of hydrogen gas in circulation, and increasing the amount of fresh hydrogen supplied. These are conventional methods; therefore, the main issue in the original question lies in increasing the amount of fresh hydrogen supplied.

Hello, thank you for your answer. I have another question: if both the fresh hydrogen pressure and the high-pressure tank pressure decrease within their respective operating ranges – for example, the operating range for fresh hydrogen pressure is 1.9~2.1, while that for high-pressure pressure is 12.0~12.2 – then how should the return valve be adjusted? Thank you

If it fluctuates within the normal range, no excessive intervention is required. Changes in the pressure of the reaction system are related to the purity of the recycled hydrogen, the amount of recycled hydrogen, and the amount of fresh hydrogen added; if this pressure keeps fluctuating. It is recommended to analyze the purity of recycled hydrogen, taking into account chemical hydrogen consumption and the desulfurization facilities for recycled hydrogen. . The best solution can only be found by considering all aspects of the problem.

The three-return-one method primarily controls the pressure associated with high hydrogen levels, achieving this by regulating the amount of fresh hydrogen supplied in order to adjust the hydrogen partial pressure in the system. This is one of the methods for controlling system pressure. The pressure control of the new hydrogen tank primarily takes into account the flow rate of the hydrogen source; since this flow rate can vary greatly, the pressure will also fluctuate significantly. The hydrogen venting of the new hydrogen tank during normal operation should not be subject to control. Producing hydrogen is costly; it’s a waste to burn it, and moreover its calorific value is low.

Reducing the processing volume, while also reducing it, indicates high hydrogen consumption.