System and method for thermally treatment of air-dispersible raw material

A method of thermal treatment of air-dispersible raw material comprising:

• introducing the raw material is into a conduit through which hot gases flow;
• subjecting the raw material to thermal treatment by the hot gases and/or the radiant heat in the conduit, wherein the conduit is a riser conduit;
• converting fuel at least partly in a treatment region;
• supplying, at least partially, heat generated in the treatment region is to the conduit, wherein the treatment region and the conduit are connected to each other such that the hot gases generated in the treatment region by the at least partial conversion of the fuel flow at least partially into the conduit;
• introducing an oxygen-rich gas is into the treatment region;
• ascertaining the oxygen content in the hot gas;
• adjusting by open-loop control or closed-loop control depending on the oxygen content ascertained the amount of oxygen introduced into the treatment region, wherein the oxygen content ascertained is compared with a target oxygen content value;
• and
• increasing the amount of oxygen introduced into the treatment region when the oxygen content ascertained exceeds the target oxygen content value, wherein the target oxygen content value is an oxygen concentration between 0% and 6%.