The raw hydrogen gas and oxygen gas will be generated through H2 generation unit, in which there are the following components with corresponding functions: ● Electrolyzer: In the electrolyzer, the DM water is decomposed into H2 and O2 within the electrolytic cells with DC power. H2 will be evolved on cathode side of cells and go up through the perforations of cathodic side of electrode plates and hydrogen channels, then flow out from the middle plate of cells. Also O2 will be evolved on the anodes of cells and flow out f...

After passing through H2 separator for removal of liquid from hydrogen, the raw hydrogen from the generator transmits into H2 purifier, inside of this, firstly raw H2 gas goes into the gas-moisture separator for removal of water. In order to remove the moisture from hydrogen further, hydrogen enters the dryer A or B or C, in which the moisture will be adsorbed by molecular sieve and product hydrogen will be sent into the product hydrogen storage tank. After molecular sieve has been adsorbed with the saturated moisture, ...

A monitoring system in hydrogen plant consists of HMI, control cabinet and primary instruments, etc. The touch screen (Operating screen) which has been designed and manufactured together with PLC is usually chosen to act as Human-Machine Interface (HMI). The monitoring software is dependent upon the different type of PLC. The HMI in the whole control system is used to monitor the operation of the system, setting the plant’s set-points and manual choices for operating conditions of starting-and-halting, gas purifying and g...