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

Claim 0:
1. 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 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 and 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.