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.

A method/system for sequestering carbon dioxide from cement and lime production facilities wherein carbon dioxide from flue gases originating from cement or lime production facilities is recovered and transported to a building materials production facility where it is sequestered.

Embodiments of the present disclosure are directed to systems and methods of removing carbon dioxide from a gaseous stream using magnesium hydroxide and then regenerating the magnesium hydroxide. In some embodiments, the systems and methods can further comprise using the waste heat from one or more gas streams to provide some or all of the heat needed to drive the reactions. In some embodiments, magnesium chloride is primarily in the form of magnesium chloride dihydrate and is fed to a decomposition reactor to generate magnesium hydroxychloride, which is in turn fed to a second decomposition reactor to generate magnesium hydroxide.

Disclosed is a method for preparing a carbon material, comprising applying a voltage to an electrically conductive medium to form an electrically conductive path in an oxygen-free environment containing a carbon source and a catalyst to obtain the carbon material, wherein the electrically conductive medium includes a solid substrate or a liquid-phase electrically conductive system; under the condition that the electrically conductive medium is the liquid-phase electrically conductive system, the carbon material is obtained in the liquid-phase electrically conductive system; and under the condition that the electrically conductive medium is the solid substrate, the carbon material is obtained on a surface of the solid substrate.

A chemical looping combustion (CLC) based power generation, particularly using liquid fuel, ensures substantially complete fuel combustion and provides electrical efficiency without exposing metal oxide based oxygen carrier to high temperature redox process. An integrated fuel gasification (reforming)-CLC-followed by power generation model is provided involving (i) a gasification island, (ii) CLC island, (iii) heat recovery unit, and (iv) power generation system. To improve electrical efficiency, a fraction of the gasified fuel may be directly fed, or bypass the CLC, to a combustor upstream of one or more gas turbines. This splitting approach ensures higher temperature (efficiency) in the gas turbine inlet. The inert mass ratio, air flow rate to the oxidation reactor, and pressure of the system may be tailored to affect the performance of the integrated CLC system and process.

A process plant and a process for production of sulfur from a feedstock gas including from 15% to 100 vol % H.sub.2S and a stream of sulfuric acid, the process including a) providing a Claus reaction furnace feed stream with a substoichiometric amount of oxygen, b) directing to a Claus reaction furnace operating at elevated temperature, c) cooling to provide a cooled Claus converter feed gas, d) directing to contact a material catalytically active in the Claus reaction, e) withdrawing a Claus tail gas and elementary sulfur, f) directing a stream comprising said Claus tail gas to a Claus tail gas treatment, wherein sulfuric acid directed to said Claus reaction furnace is in the form of droplets with 90% of the mass of the droplets having a diameter below 500 μm, with the associated benefit of such a process efficiently converting all liquid H.sub.2SO.sub.4 to gaseous H.sub.2SO.sub.4 and further to SO.sub.2.

A system for high-temperature reversible electrolysis of water, characterised in that it includes: a high-temperature reversible electrolyser, configured to operate in SOEC (solid oxide electrolyser cell) mode to produce hydrogen and store electricity, and/or in SOFC (solid oxide fuel cell) mode to withdraw hydrogen and produce electricity; a hydride tank, thermally coupled with the reversible electrolyser, the system being configured to allow the recovery of heat released by the hydride tank during hydrogen absorption in order to produce pressurised steam intended for entering the reversible electrolyser in SOEC mode, and to allow the recovery of heat released by the one or more outgoing streams from the reversible electrolyser in SOFC mode so as to allow the desorption of hydrogen from the hydride tank.

An EHS system includes a EHS cell having an anode, a cathode, and a cooling plate disposed proximate at least one of the anode or the cathode, the cooling plate configured to receive water and configured to output steam or a mixture of water and steam. The system further includes a liquid-vapor separator (LVS) configured to receive the steam or the mixture of water and steam from the cooling plate and to separate water and steam. The LVS is configured to output water to the cooling plate.

A process for production of silicon carbide and hydrogen is described, involving reacting hydrocarbon gas in the presence of silicon particles to form particulate silicon carbide and hydrogen, wherein the silicon particles, in addition to being reactants, also act as a catalyst for the reaction. Apparatus for carrying out such process is also described. The disclosed process and apparatus enable production of particulate silicon carbide at high purity, e.g., 5N (99.999%) and higher purity, as well as high purity hydrogen.

A furnace, and a method of firing it, wherein part of the fuel supplied to the furnace is produced from waste plastics by a depolymerisation process, waste heat from the furnace being used to promote the depolymerisation process. The furnace is equipped with regenerators for waste heat recovery and is fired alternately in first and second opposed directions, with the direction of firing periodically reversing between the first direction and the second direction. The supply of fuel to the furnace is temporarily interrupted while the direction of firing is reversing, means being provided to accommodate the fuel produced during the temporary interruption. The furnace may be used for producing glass.