# US 5,704,782 A · Wear lining for a rotary furnace

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- Number: US 5,704,782 A
- Document ID: US5704782A
- Status: Granted
- Kind: A
- Application number: 08/640,817
- Filed: 1996-05-08
- Granted: 1998-01-06
- Earliest claimed: 1993-11-17
- Assignees: N.V. Gouda Vuurvast
- Inventors: Joachim Otto Schulze; Johannes Adrianus Maria Butter
- Web page: https://patentgrep.com/patent/US5704782A

## CPC

- F23M 5/02: characterised by the shape of the bricks or blocks used
- F27B 7/28: Arrangements of linings
- 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

## Abstract

A wear lining for a rotary furnace of an incineration installation for, for example, chemical waste, wherein the wear lining comprises tapered bricks (1, 2, 3) which are installed in the furnace in the form of a vaulted lining, the main taper of each brick being matched to the desired vaulted lining shape, and wherein the height (H) of the bricks extends in the thickness direction of the lining. In this lining the bricks are of low porosity and able to withstand high temperatures and chemicals. Furthermore, the bricks have an additional taper which extends at least over part (h) of the height thereof, which additional taper provides, on the inside (9) of the lining, an increase in the gap width (T1) between adjoining bricks which decreases towards the outside of the lining. Preferably, the additional taper is such that, in the cold assembled state, the increase in the gap width (T1) on the inside of the lining is in the range from 1 mm to 2.4 mm. The additional taper extends over 0.1 to 0.6 times the height of the brick. The additional taper can amount to 0.15 to 0.6 times the main taper. A circumferential taper can be 0.75 to 1 degree.

## Claims

### Claim 1

Wear lining for a rotary furnace of an incineration installation for chemical waste, wherein the wear lining comprises tapered bricks which are installed in the furnace in the form of a vaulted lining, the main taper of each brick being matched to the desired vaulted lining shape, and wherein the height of the bricks extends in the thickness direction of the lining, in which the bricks have an additional taper which extends at least over part of the height thereof, which additional taper provides, on the inside of the lining, an increase in the gap width between adjoining bricks which decreases towards the outside of the lining, characterised in that the increased gap widths between the bricks are filled with mortar and that the bricks are of the type having a high corundum content, which type contains at least 70% aluminium oxide and also contains oxides of one or more of the following elements: silicon, titanium, zirconium, sodium, chromium, magnesium and phosphorus.

### Claim 2 (depends on 1)

Wear lining according to claim 1, characterised in that the additional taper amounts to 0.15 to 0.6 times the main taper.

### Claim 3 (depends on 1)

Wear lining according to claim 1, characterised in that the additional taper extends over 0.1 to 0.6 times the height of the brick.

### Claim 4 (depends on 1)

Wear lining according to claim 1, characterised in that in the cold assembled state, the increase in the gap width on the inside of the lining is in the range from 1 mm to 2.4 mm.

### Claim 5 (depends on 1)

Wear lining according to claim 1, characterised in that the bricks have a porosity of less than 18%.

### Claim 6 (depends on 1)

Wear lining according to claim 1, characterised in that the at least one additional taper is a circumferential taper.

### Claim 7 (depends on 6)

Wear lining according to claim 6, characterised in that the circumferential taper is 0.75 to 1 degree.

### Claim 8 (depends on 1)

Wear lining according to claim 1 characterised in that the height/width ratio of a brick is in the range from 1 to 3.5.

### Claim 9 (depends on 1)

Wear lining according to claim 1 characterised in that the length/height ratio of a brick is in the range from 0.45 to 1.3.

### Claim 10 (depends on 1)

Wear lining according to claim 1 characterised in that only one of the adjoining side faces of two bricks located alongside one another is provided with an additional taper.

### Claim 11 (depends on 1)

Wear lining according to claim 1 characterised in that adjoining bricks engage in one another in the vicinity of the outside of the lining by means of a tongue and groove system.