Oxyfuel clinker production without recirculation of the preheater exhaust gases

A process for producing cement clinker, comprising:

• preheating of a starting material to a calcination temperature,
• performing calcination of the preheated starting material in a calciner,
• firing of the calcined starting material in a rotary furnace to produce cement clinker, cooling of the cement clinker,
• introducing 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 the calciner,
• wherein no gases from the rotary furnace are fed to the calciner,
• providing at least a first and a second cyclone preheater configured for preheating and connected to one another in a cascading manner,
• material transfer means and/or gas transfer means for transferring material between the cyclone preheaters, wherein material is conveyed only in a direction of the second cyclone preheater and
• wherein recirculation of preheater exhaust gases does not occur, and
• wherein a ratio of starting material fed in relative to exhaust gas in said preheating step is set to greater than 1.3 kg of starting material to 1.0 kg of exhaust gas,
• passing exhaust gas from the first cyclone preheater for CO2 separation and CO2 compression,
• conveying residual gases to a stack for discharge into the atmosphere,
• passing separated CO2 for CO2 storage, CO2 transport, or further CO2 utilization,
• feeding hot exhaust gas from the rotary furnace to the second cyclone preheater.