Incineration grate consisting of grate bars and method for fitting grate bars in and removing same from an incineration grate

1. An incineration grate including several levels, the incineration grate comprising a plurality of grate bars arranged in rows alongside one another and in rows one above another, the grate bars forming step-shaped combustion surfaces with upper supporting surfaces thereof, the grate bars including first grate bars and second grate bars, wherein a step-shaped combustion surface is formed over a width of the incineration grate from several first grate bars and second grate bars,

wherein connecting surfaces are arranged on the grate bars, the connecting surfaces configured to compensate for a difference in height between two adjacent combustion surfaces of the grate bars,

wherein at least once in an area of the upper supporting surfaces, the first grate bars form a supporting surface for fuel over their width that is smaller than that of the second grate bars via a first shoulder disposed inwards in a direction of a longitudinal center plane,

wherein in an area of the upper supporting surfaces, the second grate bars have a supporting surface with a larger width in order to form an overlap with the first grate bars via a second shoulder disposed outwards over the width of the first grate bars,

wherein adjacent to and/or bordering the connecting surfaces, only the second grate bars comprise at least one pin configured to further increase the larger width, the pin configured to be introduced into a corresponding pocket in the first grate bars, and

wherein the pin comprises a projection that projects outward from a surface of a respective second grate bar.

2. The incineration grate according to claim 1 , wherein cross sections of the first and second grate bars excluding the first and second shoulders are substantially equal and have a T-shaped profile.

3. The incineration grate according to claim 1 ,

wherein cross sections of the first and second grate bars excluding the first and second shoulders are substantially equal and have a T-shaped profile,

and wherein the first and second grate bars have a substantially same width.

4. The incineration grate according to claim 1 , wherein the first and second grate bars have a substantially same width.

5. The incineration grate according to claim 1 , wherein the pocket is arranged at a distance from the upper supporting surface.

6. The incineration grate according to claim 1 , wherein the pocket, the at least one pin, or a combination thereof is arranged adjacent to or bordering a die removal plane or the connecting surfaces, or is intersected by the die removal plane or the connecting surfaces.

7. The incineration grate according to claim 1 , wherein in the area of the upper supporting surfaces, the first grate bars have a rib that is arranged below the second shoulder to form the overlap of the first and second grate bars.

8. The incineration grate according to claim 7 , wherein the upper supporting surfaces, the first and second shoulders, the overlap of the first and second grate bars, the rib, the pocket, the at least one pin, or a combination thereof are formed symmetrically with respect to the longitudinal center plane running from top to bottom and in a longitudinal direction of the grate bars.

9. The incineration grate according to claim 1 , wherein spacers are arranged on adjacent contact surfaces between the first and second grate bars.

10. The incineration grate according to claim 1 , wherein

each of the first grate bars and the second grate bars include a support at a rear end thereof, the support configured for a form-fitting connection with a grate rod, and

a connecting surface of each of the first grate bars and the second grate bars is located at a front end thereof.

11. A method for installing and removing grate bars into and from an incineration grate comprising a plurality of grate bars arranged in rows alongside one another and in rows one above another, the grate bars including first grate bars and second grate bars having upper supporting surfaces and adjacent connecting surfaces, the method comprising:

forming a step-shaped combustion surface over a width of the incineration grate using the upper supporting surfaces of the first grate bars and second grate bars, which are mounted on one side with a support on a grate rod, wherein, at least once, over their width, the first grate bars form a supporting surface for fuel that is smaller than that of the second grate bars via a first shoulder disposed inwards in a direction of a longitudinal center plane, and wherein, in an area of the upper supporting surfaces, the second grate bars have a supporting surface with a larger width in order to form an overlap with the first grate bars via a second shoulder disposed outwards over the width of the first grate bars,

wherein adjacent to and/or bordering the connecting surfaces, only the second grate bars comprise at least one pin configured to further increase the larger width, the pin configured to be introduced into a corresponding pocket in the first grate bars,

wherein the pin comprises a projection that projects outward from a surface of a respective second grate bar,

wherein for removal, a second grate bar on a side of the support is lifted from the grate rod far enough so that the second grate bar can be slid along the longitudinal center plane in order to remove the pin from the pocket of adjacent first grate bars, and

wherein a reverse sequence is used for installing the second grate bar.

12. The method according to claim 11 , wherein

the support of each of the first grate bars and the second grate bars is located at a rear end thereof, and

a connecting surface of each of the first grate bars and the second grate bars is located at a front end thereof.