ROTATING KILN FOR MAKING CEMENT CLINKER Russian patent published in 2017 - IPC F27B7/16 

FIELD: metallurgy.

SUBSTANCE: kiln comprises a cylindrical chamber installed in the end and intermediate supports rotatable around its longitudinal axis, inclined at an acute angle to the horizontal, charging and discharging units positioned in the opposite charging and discharging ends, carbon dioxide sampling unit connected to the collector of the abovementioned gas or devices for its utilization and located at the discharge end, and a device for raw mix heating, the cylindrical chamber is designed composite along the length and made up of at least six sections, each of which is provided with a separate rotary drive to ensure rotation independent from the other, the sections are placed one after the other coaxially to the longitudinal axis of the installation and to each other and are separated by five intermediate supports, where the outer ends of the end sections are located in the end supports, and their ends facing the neighbouring sections are placed in the respective intermediate supports. The device for raw mix heating contains several heating units mounted, respectively, on the end and intermediate supports and adapted for heating in the mentioned sections in the direction from the charging unit, respectively, up to 200°C, from 200 to 800 °C, from 800 to 1000 °C, from 1000 to 1300 °C, from 1300 to 1450 °C and from 1300 to 1000 °C. The heating units are designed as burners, preferably gas burners arranged to generate a flame and / or plasma torches mounted on the end and intermediate supports, wherein the heating units are oriented at an acute angle to the longitudinal axis of the installation. A mixture of air and nitrogen is used as plasma-supporting gas in plasma torches, where the plasma torches are communicated with the nitrogen source via a conduit equipped with adjustable gates. The inner surface of the sections has pockets open in the direction of rotation. Nitrogen collector is communicated with the external gas source designed to produce nitrogen from ammonia.

EFFECT: increased clinker quality and lower energy costs.

6 cl, 2 dwg