Process for thermoprocessing a charge

A process for thermoprocessing a charge, comprising:

• introducing a non-gaseous charge to be thermoprocessed into a furnace,
• heating the furnace by means of combustion of fuel with oxidant, said fuel and oxidant being supplied to the furnace at regulated supply rates,
• generating an atmosphere in the furnace, said atmosphere comprising of a gaseous mixture comprising (a) combustion gas generated by the combustion of the fuel with the oxidant and (b) carbon dioxide released by the charge during thermoprocessing,
• withdrawing the thermoprocessed charge from the furnace and
• evacuating the gaseous mixture as flue gas from the furnace, wherein
• hydrogen is supplied to the process and a non-zero fraction of the flue gas containing at least 50% vol and at most 100% vol CO2 is combined with at least part of the supplied hydrogen and subjected to a reverse water-gas shift (rWGS) reaction with said hydrogen in a rWGS reactor, wherein at least part of the CO2 in the fraction is converted into CO, and:
• the reaction product of the rWGS reaction is supplied to the furnace as part or all of the fuel to be combusted,
• wherein the process is a glass-melting process and
• solid glass-forming material to be melted is introduced into the furnace as the non-gaseous charge to be thermoprocessed,
• carbon dioxide is released into the furnace atmosphere by the glass-forming material during thermoprocessing. and
• wherein the molten glass is withdrawn from the furnace as the thermoprocessed charge.