A tuyere sleeve for hydrogen-enriched carbonic oxide recycling oxygenate furnace includes a tuyere body, a front surface of the tuyere sleeve, and an oxygen channel. The front end is welded to a front welding interface with the front surface. The oxygen channel is defined inside the tuyere body, and the oxygen channel extends from an inner side of the front surface of the tuyere sleeve. The oxygen outlet is located at a distance of 20 mm-50 mm from the tuyere front surface, and an angle between the oxygen outlet and a centerline of the tuyere sleeve is in a range of 25-30. During a normal operation, controlling an oxygen flow rate in oxygen outlet to be not less than 150 m/s, and controlling a distance between a front high-temperature zone and a front surface to be not less than 200 mm.

A tuyere sleeve for hydrogen-enriched carbonic oxide recycling oxygenate furnace includes a tuyere body, a front surface of the tuyere sleeve, and an oxygen channel. The front end is welded to a front welding interface with the front surface. The oxygen channel is defined inside the tuyere body, and the oxygen channel extends from an inner side of the front surface of the tuyere sleeve. The oxygen outlet is located at a distance of 20 mm-50 mm from the tuyere front surface, and an angle between the oxygen outlet and a centerline of the tuyere sleeve is in a range of 25-30. During a normal operation, controlling an oxygen flow rate in oxygen outlet to be not less than 150 m/s, and controlling a distance between a front high-temperature zone and a front surface to be not less than 200 mm.

The present disclosure relates to a method of thermal treatment of air-dispersible raw material, especially cement raw meal and/or mineral products, wherein the raw material is introduced into a conduit through which hot gases flow and is subjected to thermal treatment by the hot gases and/or the radiant heat in the conduit, fuel is at least partly converted in a treatment region, and the heat generated in the treatment region is supplied at least partly to the conduit, and an oxygen-rich gas is introduced into the treatment region, wherein the oxygen content in the hot gas and/or the gas temperature is ascertained and the amount of oxygen introduced into the treatment region is adjusted by open-loop or closed-loop control depending on the temperature ascertained and/or the oxygen content.

The present disclosure relates to a method of thermal treatment of air-dispersible raw material, especially cement raw meal and/or mineral products, wherein the raw material is introduced into a conduit through which hot gases flow and is subjected to thermal treatment by the hot gases and/or the radiant heat in the conduit, fuel is at least partly converted in a treatment region, and the heat generated in the treatment region is supplied at least partly to the conduit, and an oxygen-rich gas is introduced into the treatment region, wherein the oxygen content in the hot gas and/or the gas temperature is ascertained and the amount of oxygen introduced into the treatment region is adjusted by open-loop or closed-loop control depending on the temperature ascertained and/or the oxygen content.