Oxyfuel clinker production with special oxygen addition

A method for producing cement clinker, comprising:

• preheating a starting material to a calcination temperature,
• performing calcination of the preheated starting material in a calciner,
• firing, in a rotary furnace, the calcined starting material to form cement clinker,
• cooling the cement clinker in a cooler, and
• feeding an oxygen-containing gas having a proportion of 15% by volume or less of nitrogen and a proportion of 50% by volume or more of oxygen into a first section of the cooler, the first section of the cooler directly adjoining a top portion of the rotary furnace, and from the first section of the cooler into the rotary furnace,
• wherein the total gas streams fed to the combustion processes consist of more than 50% by volume of oxygen, and
• wherein the introduction of the oxygen-containing gas is set so that there is an excess of oxygen at a main burner and residual amounts of the oxygen-containing gas are permitted to enter the calciner for combustion.

A plant for producing cement clinker, comprising:

• a preheater,
• a calciner,
• a rotary furnace, and
• a clinker cooler, wherein the plant has, at a section of the cooler directly adjoining a top of the rotary furnace, a device for feeding gas from the cooler to the rotary furnace, the device configured to feed a gas having a proportion of 15% by volume or less of nitrogen and a proportion of 50% by volume or more of oxygen, and
• wherein the plant is configured for feeding gas streams which in total consist to an extent of more than 50% by volume of oxygen to combustion processes
• wherein the introduction of gas is set so that there is an excess of oxygen at a main burner and residual amounts of the oxygen are conveyed into the calciner.