ProSim, a provider of software and services for simulation and optimization of industrial processes, has added an electrolyzer module in the new version of its ProSimPlus software. By combining this module with other equipment from the ProSimPlus library, users can simulate the entire process of hydrogen (H₂) production by electrolysis of water and optimize the process as a whole. Depending on the available data, the user can choose a more or less detailed modeling of the electrolysis operation.

H₂ is receiving increasing interest in energy transition projects and is expected to play a significant role in the energy mix. As it is almost non-existent in nature in a molecular state, H₂ is industrially obtained by reforming or gasification of hydrocarbons, thermochemical dissociation of water or biomass, or electrolysis of water.

Today, H₂ is mainly produced from fossil fuels (steam reforming and gasification of hydrocarbons), which limits the interest in H₂ as a clean energy source. In contrast, electrolysis of water represents the main alternative for decarbonized H₂ production.

ProSim says that the advantage of its new electrolyzer module is its ability to rigorously simulate an electrolysis process by offering a flexible modeling approach, depending on the data available to the user:

• A first approach quickly and simply establishes the material and energy balances, considering possible recycling of the electrolyte solution, purges and/or equilibration lines, as well as determining the necessary makeup streams;
• A more detailed approach uses a selection of rigorous models to calculate, based on operating conditions and technological characteristics, all operating parameters: efficiency, electrical characteristics (voltage, current, electrical power...) and "voltage-current" characteristic curves.

The new version of ProSimPlus can be used to design electrolysis H₂ production units:

• Process development by simulating the operation of production units on laboratory, pilot or industrial scales
• Optimize operating conditions to meet production specifications as well as energy constraints
• Automatic generation of "specification sheets" for equipment sizing (electrolyzer, heat exchangers, pumps, compressors, separation tanks, etc.).

The electrolysis module available in ProSimPlus allows for the representation of the three main electrolyzer technologies:

• Alkaline: Electrolysis cells are separated by a diaphragm and are immersed in an electrolytic solution
• Proton exchange membrane (PEM): Cells are separated by a solid electrolyte made of a polymer membrane providing conduction of H⁺ protons;
• Solid oxide electrolysis cell (SOEC): Cells are separated by a solid electrolyte made of a ceramic membrane providing conduction of O^2- ions.

About ProSim. ProSim provides simulation and optimization software that enables process industries to improve the performance of their units, increase profitability or reduce environmental impact.