Automation for green hydrogen

At the beginning of the hydrogen value chain is the production of hydrogen by means of electrolysis. In order to produce hydrogen with zero emissions, electrolysis using sustainable electricity is already used as an established technology. An automation concept that is perfectly matched to the electrolyzer is the key to its efficient, safe and long-term operation. Festo offers an extensive portfolio for this purpose, which covers the entire automation pyramid from the control level to the field level. Festo provides its own remote I.O. modules (CPX-E, CPX-AP) and valve terminals (VTUG) for control and communication between the controller and process valves. All components are modular and freely configurable. This means that both input/output modules (digital, analog) and the fieldbus module can be adapted to the field devices and PLC.

Controlling processes with a positioner or proportional valve
Various types of process valves are used to control flow rates, gases and liquids, temperature, etc. In the classic case, the actuators – and thus indirectly the process valves – are controlled by means of a positioner. These use different methods to measure the position of the actuator or valve and control it to the position desired by the main controller. Festo offers the CMSH positioner for this purpose. Another control device is the I/P transducer, a current/pressure transducer. This is used primarily in linear systems – but only when the position of the valve plays a subordinate role for the safety-related consideration. Proportional valves such as the VPPM from Festo can take over the function of an I/P transducer. In doing so, they usually exceed the control quality and ease of use of the transducer.

Safety is paramount
Hydrogen is a colorless, volatile and non-toxic gas that is highly flammable and must be handled at high pressure. Numerous safety regulations must therefore be observed when setting up production and the necessary infrastructure. To get the green hydrogen produced to where it is to be used, it must be made transportable. This can be done, for example, by compressing it in a compressor station. The safety of a plant is also important in the event of malfunctions or faults. Festo's portfolio includes numerous products that are specially designed for use in potentially explosive atmospheres and are certified according to the IEC 61508 SIL standard, such as the VOFC and VOFD valves. The functional safety of electrolysers is therefore essential to making industrial processes safe, efficient and environmentally friendly. 

Customer-specific and ready to install
Festo also offers control cabinet solutions that meet the SIL standard. These protect components against environmental influences and foreign bodies. Regardless of whether pneumatic, electric or electro-pneumatic components are used, the end result is a fully designed control cabinet that centrally controls the actuators and sensors in the container. For applications in explosion-prone areas, the control cabinets can be planned, assembled and certified according to regional and international regulations.