# US 2006/0213405 A1 · Grate covering

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- Number: US 2006/0213405 A1
- Document ID: US20060213405A1
- Status: Published application
- Kind: A1
- Application number: 11/207,215
- Filed: 2005-08-19
- Published: 2006-09-28
- Earliest claimed: 2005-03-22
- Assignees: ALSTOM Technology Ltd
- Inventors: Bernhard Zimmermann
- Web page: https://patentgrep.com/patent/US20060213405A1

## CPC

- F27D 5/0006: {Composite supporting structures}
- C21D 9/0025: {Supports; Baskets; Containers; Covers}
- F23G 5/002: {characterised by their grates (F23G5/05 takes precedence)}
- F23H 9/02: Revolving cylindrical grates
- F23H 17/12: Fire-bars
- 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
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- F23G: CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23H: GRATES (inlets for fluidisation air for fluidised bed combustion apparatus F23C10/20); CLEANING OR RAKING GRATES

## Abstract

A grate covering for an incineration grate of an incineration furnace having a combustion chamber, includes a plurality of metal grate bars, each having a surface facing the combustion chamber that includes a layer made of a temperature-resistant, corrosion-resistant and abrasion-resistant non-metallic material, wherein a thickness of the layer is minimally sufficient to bear pressure and thrust loading. The thickness of the layer is about 10 mm to 15 mm. For a forward feed grate, the layer on each metal grate bar is present only in a zone of contact with an adjacent metal grate bar, and for a roller grate, and wherein the layer is present on the entire surface facing the combustion chamber.

## Claims

### Claim at position 1

1-10. (canceled)

### Claim 11

A grate covering for an incineration grate of an incineration furnace having a combustion chamber, the grate covering comprising:
a plurality of metal grate bars, each having a surface facing the combustion chamber that includes a layer made of a temperature-resistant, corrosion-resistant and abrasion-resistant non-metallic material, wherein a thickness of the layer is minimally sufficient to bear pressure and thrust loading.

### Claim 12 (depends on 11)

The grate covering as recited in claim 11, wherein the thickness of the layer is about 10 mm to 15 mm.

### Claim 13 (depends on 11)

The grate covering as recited in claim 11, wherein the incineration grate is a forward feed grate, wherein the plurality of metal grate bars includes adjacent metal grate bars in moveable contact with one another, and wherein the layer on each metal grate bar is present only in a zone of contact with an adjacent metal grate bar.

### Claim 14 (depends on 11)

The grate covering as recited in claim 11, wherein the incineration grate is a roller grate, and wherein the layer is present on the entire surface facing the combustion chamber.

### Claim 15 (depends on 11)

The grate covering as recited in claim 11, wherein the layer is attached to each of the metal grate bars by means of an adhesive bond.

### Claim 16 (depends on 11)

The grate covering as recited in claim 11, wherein the layer is cemented into each of the metal grate bars.

### Claim 17 (depends on 11)

The grate covering as recited in claim 11, wherein the layer is connected to each of the metal grate bars by means of a mechanical joint.

### Claim 18 (depends on 17)

The grate covering as recited in claim 17, wherein the mechanical joint is a countersunk screwed connection.

### Claim 19 (depends on 11)

The grate covering as recited in claim 11, wherein the non-metallic material is a ceramic material.

### Claim 20 (depends on 11)

The grate covering as recited in claim 11, wherein a circumference of the layer is delimited by a metal web formed at an edge of each metal grate bar.

### Claim 21 (depends on 20)

The grate covering as recited in claim 20, wherein the web has a rectangular contour.

### Claim 22 (depends on 20)

The grate covering as recited in claim 20, wherein the web has a slanted contour that widens in a direction of the surface.

### Claim 23 (depends on 11)

The grate covering as recited in claim 11, wherein the layer includes several segments.