A device for preparing high-purity hydrogen and/or oxygen by electrolyzing water, including an electrolyzer and a degasser for degassing desalted water. The degasser is located at the upstream of the electrolyzer. After desalted water is heated and degassed in the degasser, the content of gaseous impurities, particularly argon, can be reduced to several ppb (weight ratio). The hydrogen and oxygen generated after the desalted and degassed water is electrolyzed in the electrolyzer also contain an extremely small amount of argon, so that the requirements in semiconductor industry are met. Also involved is a method of preparing high-purity hydrogen and/or oxygen by using the device.

The method for operating a water electrolysis device for generating hydrogen and oxygen from water has a PEM electrolyser (1), to which water for generating the hydrogen and the oxygen is supplied together with water for cooling. The cooling water is conducted in the circuit and treated by means of an ion exchanger unit (17). Only part of the water conducted in the circuit is supplied to the ion exchanger unit (17) and another part is supplied to the PEM electrolyser (1) via a bypass (13) circumventing the ion exchanger unit (17).

The method for operating a water electrolysis device for generating hydrogen and oxygen from water has a PEM electrolyser (1), to which water for generating the hydrogen and the oxygen is supplied together with water for cooling. The cooling water is conducted in the circuit and treated by means of an ion exchanger unit (17). Only part of the water conducted in the circuit is supplied to the ion exchanger unit (17) and another part is supplied to the PEM electrolyser (1) via a bypass (13) circumventing the ion exchanger unit (17).

A solid oxide electrolyzer cell (SOEC) system including a stack of electrolyzer cells configured to receive liquid water that is heated using one or more heaters, and a mass flow controller configured to control the liquid water flowrate into the one or more heaters.

A solid oxide electrolyzer cell (SOEC) system including a stack of electrolyzer cells configured to receive liquid water that is heated using one or more heaters, and a mass flow controller configured to control the liquid water flowrate into the one or more heaters.

A solid oxide electrolyzer cell (SOEC) system including a stack of electrolyzer cells configured to receive water or steam in combination with hydrogen, and a steam recycle outlet configured to recycle a portion of the water or steam

A compressor for a solid oxide electrolyzer cell (SOEC) system, the system including one or more stamps that receives hydrogen input and outputs wet hydrogen, a heat exchanger or condenser that is configured to decrease the temperature of the wet hydrogen, a compressor that is configured to increase the pressure of the wet hydrogen, and a dryer that is configured to reduce the dew point of the wet hydrogen.

A compressor for a solid oxide electrolyzer cell (SOEC) system, the system including one or more stamps that receives hydrogen input and outputs wet hydrogen, a heat exchanger or condenser that is configured to decrease the temperature of the wet hydrogen, a compressor that is configured to increase the pressure of the wet hydrogen, and a dryer that is configured to reduce the dew point of the wet hydrogen.

An electrolyzer system includes a stack of solid oxide electrolyzer cells configured receive steam and output a hydrogen exhaust and an oxygen exhaust, a supplemental steam generator configured to generate the steam provided to the stack by vaporizing water using heat extracted from the oxygen exhaust, a water preheater configured to preheat water using heat extracted from the oxygen exhaust, and a primary steam generator configured to generate the steam provided to the stack by vaporizing the water preheated by the water preheater.

An energy storage system converts variable renewable electricity (VRE) to continuous heat at over 1000° C. Intermittent electrical energy heats a solid medium. Heat from the solid medium is delivered continuously on demand. An array of bricks incorporating internal radiation cavities is directly heated by thermal radiation. The cavities facilitate rapid, uniform heating via reradiation. Heat delivery via flowing gas establishes a thermocline which maintains high outlet temperature throughout discharge. Gas flows through structured pathways within the array, delivering heat which may be used for processes including calcination, hydrogen electrolysis, steam generation, and thermal power generation and cogeneration. Groups of thermal storage arrays may be controlled and operated at high temperatures without thermal runaway via deep-discharge sequencing. Forecast-based control enables continuous, year-round heat supply using current and advance information of weather and VRE availability. High-voltage DC power conversion and distribution circuitry improves the efficiency of VRE power transfer into the system.