Valves in action –
Steam trap KA2 ATEX H2
Condensate discharge in a PEM electrolyzer
Hydrogen offers great decarbonization potential and is versatile as an energy source. In nature, the gas is predominantly present in bound form and must be released from its carriers. This is often done by water electrolysis, in which water is decomposed into its basic components oxygen and hydrogen by electrochemical reactions. The hydrogen produced is to be used primarily where high energy densities are required, e.g. in various production processes in the iron and steel industry or in refineries.
A prominent mineral oil company is gradually reducing the traditional steam reforming process to produce green hydrogen with the help of a modern electrolysis plant. The high-purity hydrogen produced in this way is used to decarbonize refinery processes. The electricity required for electrolysis comes from offshore wind turbines.
TASK // Discharge of condensate from the anode circuit
The refinery uses PEM electrolysis. This is particularly compatible with dynamic energy sources with occurring voltage peaks - such as wind power in this case. The water used for decomposition is ultra-pure (DI water) and is preheated to approx. 65°C.
PEM electrolysis consists of an anode circuit (oxygen side) and a cathode circuit (hydrogen side). The electrolysis cells are connected in series in so-called stacks. The ultra-pure water is decomposed in the stacks, with the semi-permeable membrane allowing protons to pass through in only one direction. The oxygen gas produced is separated from the resulting water/oxygen two-phase mixture by means of a gas separator. The remaining, undecomposed water is returned to the electrolysis circuit, where it must pass through a heat exchanger. A condensate trap of type KA 2 ATEX H2 is arranged upstream of the heat exchanger and discharges residual liquids or any condensate sludge without pressure.
SOLUTION // Steam trap KA 2 ATEX H2 for use in potentially explosive atmospheres
When recovering DI water within the gas/liquid circuit, the self-acting KA 2 ATEX H2 ensures safe discharge of the condensates produced. It operates smoothly and without interference from back pressure or pressure fluctuations. Hydrogen is an elementary gas which, in contact with oxygen, is activated to react even with very low energy. Therefore, the valve complies with ATEX Directive 2014/34/EU and can be used safely in Zone 1 hazardous areas.
The valve body is provided with a grounding lug for potential equalization. The float-controlled steam trap is made entirely of stainless steel (1.4404/316L) and has excellent corrosion resistance to aggressive condensate. The soft seal ensures a gas-tight valve seal. With its excellent surface finish, the KA2 ATEX H2 is easy to clean.
