Abstract: An electrolysis system having one or more electrolysers, a header line for providing a continuous flow of a fluid, one or more power supplies to provide electrical energy to the one or more electrolysers for the electrolysis process and one or more liquid-based first cooling devices for cooling the one or more power supplies. At least part of the fluid is diverted into the first cooling device for cooling the power supply.

Abstract: The invention relates to an electrolysis arrangement for the production of hydrogen and oxygen by alkaline electrolysis. The electrolysis arrangement includes a system configuration which enables to balance the lye concentrations between the anode and cathode section of the arrangement depending on the current density of the direct current supplied to the electrolysis stack of the electrolysis medium. At high current densities, hydrogen to oxygen crossover and oxygen to hydrogen crossover is low, which allows full mixing of electrolysis media to balance the concentration between anolyte and catholyte. At low current densities, hydrogen to oxygen crossover and oxygen to hydrogen crossover is high. Therefore, the electrolysis arrangement is configured so that the mixing of the electrolysis media is decreased in case a current density of a direct current supplied to the electrolysis stack is decreased.

Abstract: Electrolysis arrangement for producing hydrogen by electrolysis that can include a first input terminal configured to supply electrical energy to the electrolysis arrangement; a second input terminal configured to supply electrical energy to the electrolysis arrangement; a first transformer; a second transformer; a first group of electrolysis stacks, which comprises a first sub-group and a second sub-group; a second group of electrolysis stacks which comprises a first sub-group and a second sub-group, wherein the electrolysis stacks of the first group are spatially separated from the electrolysis stacks of the second group, wherein the electrolysis stacks of the first sub-group of the first group and of the first sub-group of the second group are electrically connected via the first transformer to the first input terminal, and wherein the electrolysis stacks of the second sub-group of the first group (A) and of the second sub-group of the second group are connected electrically via the second transformer to t

Abstract: The invention related to a method for the start-up of an electrolysis system, wherein the electrolysis system is configured to produce hydrogen at the cathode side of the electrolysis system from a water containing electrolysis medium. According to the method, at least part of the electrolysis system is purged with an inert gas during stand-by. The inert gas is displaced from the cathode side of the electrolysis system by means of the hydrogen stream produced during start-up. The resulting mixed stream, which comprises at least hydrogen and inert gas, is supplied to a hydrogen separation unit until a predetermined upper concentration limit of inert gas in the mixed stream is reached. After the predetermined upper concentration limit of inert gas in the mixed stream, now low in inert gas, has been reached, the mixed stream is withdrawn from the electrolysis system by bypassing the hydrogen separation unit.

Abstract: The invention relates to an electrolysis arrangement for the production of hydrogen and oxygen by alkaline electrolysis. The electrolysis arrangement includes a system configuration which enables to balance the lye concentrations between the anode and cathode section of the arrangement depending on the current density of the direct current supplied to the electrolysis stack of the electrolysis medium. At high current densities, hydrogen to oxygen crossover and oxygen to hydrogen crossover is low, which allows full mixing of electrolysis media to balance the concentration between anolyte and catholyte. At low current densities, hydrogen to oxygen crossover and oxygen to hydrogen crossover is high. Therefore, the electrolysis arrangement is configured so that the mixing of the electrolysis media is decreased in case a current density of a direct current supplied to the electrolysis stack is decreased.

Abstract: An apparatus for dissolving or suspending a substance in a solvent comprising an outer chamber for containing a dense gas; an inlet for supplying dense gas as a solvent; a porous chamber within the outer chamber for containing a substance for dissolution or suspension with the solvent, the porous chamber having a wall which allows passage of solvent and the substance dissolved or suspended in the solvent, and an outlet for removing solvent and solution and/or dispersion from the outer chamber and a turbulence means for creating turbulence within the porous chamber. A method of dissolving or suspending a substance, and fine particles formed from the resulting solution or suspension are disclosed.