# US 5,350,296 A · Method and device for cooling a rotary kiln

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- Number: US 5,350,296 A
- Document ID: US5350296A
- Status: Granted
- Kind: A
- Application number: 08/103,870
- Filed: 1993-03-17
- Granted: 1994-09-27
- Earliest claimed: 1990-09-17
- Assignees: ABB Flakt AB
- Inventors: Goran Wikstrom
- Web page: https://patentgrep.com/patent/US5350296A

## CPC

- F23G 5/20: having rotating or oscillating drums
- F23M 5/085: {using air or other gas as the cooling medium}
- F27B 7/38: Arrangements of cooling devices
- F27D 9/00: Cooling of furnaces or of charges therein (casings, linings, walls or roofs incorporating cooling arrangements F27D1/12)
- F23G: CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23M: CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
- F27B: FURNACES, KILNS, OVENS OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27D: DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE

## 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.

## Claims

### Claim 1

A method for cooling a rotary kiln having a cylindrical outer jacket, comprising the steps of:
blowing cooling air at a high speed substantially radially towards the jacket from a supply-air chamber which surrounds said jacket over the main part of its circumference and extends over at least part of its axial extension and which has an inner wall located at a slight distance from said jacket and formed with substantially radially directed perforations which are distributed over the supply-air chamber and through which the cooling air is blown towards said jacket;
sucking the cooling air out substantially radially from the space between the jacket and the inner wall of the supply-air chamber to an exhaust-air chamber which is separate from and surrounds the supply-air chamber and communicates with said space via tubes which are distributed throughout the supply-air chamber and extend substantially radially therethrough; and
adjusting the cooling-air flow through the chambers by supply-air and exhaust-air devices connected to said chambers.

### Claim 2 (depends on 1)

The method of claim 1, wherein said supply-air chamber has at least one cooling-air inlet.

### Claim 3 (depends on 2)

The method of claim 2, wherein the cross-sectional area of the supply-air chamber decreases in the circumferential direction away from the respective cooling-air inlet.

### Claim 4 (depends on 3)

The method of claim 3, wherein the supply-air chamber is annular.

### Claim 5 (depends on 4)

The method of claim claim 4, wherein the supply-air and exhaust-air devices are fan devices.