Lappeenrannan-lahden Teknillinen Yliopisto Lut

Solar Foods Oy

Vesa Ruuskanen

Jero Ahola

Markku Niemelä

Juha-Pekka Pitkänen

Tuomo Lindh

Andrey Lana

Lauri Nygren

Joonas Koponen

Antti Kosonen

Anton Poluektov

Markku Niemela

A system for alkaline water electrolysis includes electrolysis cells, a hydrogen separator tank, a first piping from the electrolysis cells to the hydrogen separator tank, an oxygen separator tank, a second piping from the electrolysis cells to the oxygen separator tank, and a third piping for conducting liquid electrolyte from the hydrogen separator tank and from the oxygen separator tank back to the electrolysis cells. The system includes an ultrasound source for applying ultrasound on the liquid electrolyte contained by the first piping. The ultrasound enhances the separation of dissolved hydrogen gas from the liquid electrolyte contained by the first piping, and thus energy efficiency of the alkaline water electrolysis is improved. Furthermore, a safe control range of the alkaline water electrolysis is broadened because crossover of hydrogen gas to an oxygen side of the system is reduced.

System and a method for alkaline water electrolysis

A power converter for a bioelectrochemical system includes first converters each including a direct current terminal for supplying electric current via electrodes of the bioelectrochemical system, and a second converter for supplying energy to the first converters from an external electric power grid. Each first converter includes an electric element for receiving energy from the second converter and a circuitry for converting voltage of the electric element into electrolysis voltage suitable for the bioelectrochemical system. The electric element can be a secondary winding of a transformer or a direct voltage energy storage. Each first converter is galvanically isolated from the other first converters at least when the first mentioned first converter supplies energy to the bioelectrochemical system. Thus, each first converter drives its own electrode pair without disturbing the other first converters.

Power converter for a bioelectrochemical system

Growing community of inventors

Lappeenranta, Finland

Vesa Ruuskanen