Patent ID: 11878950
Assignee: THYSSENKRUPP INDUSTRIAL SOLUTIONS AG
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  F | IPC C  F

Claim 11:
12. 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;
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; and
limiting fuel energy that is introduced into the rotary furnace to less than 33% of fuel energy necessary for clinkering,
wherein the total gas streams fed to the cooler consist of more than 75% by volume of oxygen,
the introduction of the oxygen-containing gas is set so that there is an excess of oxygen at a main burner, so that residual amounts of the oxygen-containing gas are permitted to enter the calciner for combustion, and a proportion of oxygen in the oxygen-containing gas fed from the cooler into the rotary furnace is the same as the proportion of oxygen in the oxygen-containing gas fed to the cooler.