In a thermochemical regenerator wherein gaseous combustion products that are formed by combustion in a furnace are passed from the furnace into and through a first regenerator, the combustion products are combined with gaseous fuel, and the resulting mixture is passed into and through a second regenerator wherein the mixture undergoes an endothermic reaction to form syngas, the thermochemical regeneration is enhanced by injecting fuel gas into a recycle stream comprising the combustion products from the first regenerator to entrain recycled flue gas that passes out of the first regenerator and to impel the mixture into the other regenerator.

A radiative recuperator preheats oxidant and/or fuel for combustion at one or more burners of a furnace. The recuperator includes a duct, at least portions of which comprise a material having a thermal conductivity of greater than 1 W/(m.Math.K), preferably greater than 3 W/(m.Math.K), that receives hot flue gas produced by the burner(s). The duct radiatively transfers heat to oxidant or fuel (for preheating) flowing through one or more metallic pipes disposed in between the duct and an insulating wall.

A thermochemical regenerator system is operated without encountering accumulation of unwanted solids on the interior surfaces of the passages through which flue gas passes.

Thermochemical regeneration is enhanced by injecting fuel gas to entrain recycled flue gas that passes out of a regenerator to form a mixture that is impelled into the other regenerator.

A radiative recuperator preheats oxidant and/or fuel for combustion at one or more burners of a furnace. The recuperator includes a duct, at least portions of which comprise a material having a thermal conductivity of greater than 1 W/(m.Math.K), preferably greater than 3 W/(m.Math.K), that receives hot flue gas produced by the burner(s). The duct radiatively transfers heat to oxidant or fuel (for preheating) flowing through one or more metallic pipes disposed in between the duct and an insulating wall.

The invention relates to a regenerator assembly and an inlet arrangement for collection of carry over (10) for a vertical regenerator (80) of an end-port furnace (90) comprising: an inlet wall comprising an opening for a port for gas exchange, e.g. towards or from an end-port furnace; a target wall being arranged such, that most of the via the inlet wall incoming hot gas is initially deflected at the target wall; a barrier wall comprising a recess for gas exchange, e.g. from or towards a pass of the regenerator, a (at least one) delimiting wall or walls, such as a floor and/or a roof and/or a sidewall; the inlet wall, the target wall, the barrier wall and the delimiting wall or walls define the inlet arrangement for collection of carry over such that a gas flow entering the inlet arrangement for collection of carry over via the port will exit the inlet arrangement for collection of carry over via the recess or vice versa; and the ratio between the area of the barrier wall and the total area in the plane of the barrier wall, limited by the delimiting wall or walls, such as the floor, the roof, the inlet wall and the target wall, is in the range of 20% to 40%.

A radiative recuperator preheats oxidant and/or fuel for combustion at one or more burners of a furnace. The recuperator includes a duct, at least portions of which comprise a material having a thermal conductivity of greater than 1 W/(m.Math.K), preferably greater than 3 W/(m.Math.K), that receives hot flue gas produced by the burner(s). The duct radiatively transfers heat to oxidant or fuel (for preheating) flowing through one or more metallic pipes disposed in between the duct and an insulating wall.

A radiative recuperator preheats oxidant and/or fuel for combustion at one or more burners of a furnace. The recuperator includes a duct, at least portions of which comprise a material having a thermal conductivity of greater than 1 W/(m.Math.K), preferably greater than 3 W/(m.Math.K), that receives hot flue gas produced by the burner(s). The duct radiatively transfers heat to oxidant or fuel (for preheating) flowing through one or more metallic pipes disposed in between the duct and an insulating wall.

Operation of a thermochemical regenerator combustion system in which fuel is fed with furnace flue gas into the regenerators to reduce the oxygen content and optionally to establish a reducing atmosphere in both cycles in which the regenerators operate.

A thermochemical regenerator system is operated without encountering accumulation of unwanted solids on the interior surfaces of the passages through which flue gas passes.