Method and device for cooling a rotary kiln

Abstract

In a method for cooling a rotary kiln having a cylindrical outer jacket, cooling air is blown at high speed radially towards the jacket from an annular supply-air chamber surrounding the jacket and having a perforated inner wall which is located at a slight distance from the jacket and through which the cooling air is blown towards the jacket. The cooling air is sucked out from the space between the jacket and the inner wall to an annular exhaust-air chamber which is separate from and surrounds the supply-air chamber and communicates with said space. The cooling-air flow through the chambers is adjusted by fan devices connected thereto. A device for implementing this method has an annular supply-air chamber surrounding the jacket and having a perforated inner wall which is located at a slight distance from the jacket and designed for radially blowing cooling air towards the jacket. An annular exhaust-air chamber, which is separate from and surrounds the supply-air chamber, communicates with the space between the jacket and the inner wall to conduct cooling air from this space. Fan devices are connected to the chambers in order to adjust the cooling-air flow therethrough.

Dependencies are inferred from the claim text.