FR2599817A1 - Grate bar for combustion or incineration - Google Patents

Abstract

The present invention relates to a grate bar for combustion or incineration, especially with a back movement, comprising a raking head exhibiting at least one face extending substantially transversely to the direction of movement of the fuel on the grate and two side faces extending substantially parallel to the direction of movement of the fuel, and having at least one inlet orifice for combustion air. According to the invention, this orifice 6 is provided through each of the two side faces, in such a way as to distribute the flow of air substantially perpendicularly to the direction of movement of the fuel. The invention finds an application in the field of industrial incineration.

Description

 The subject of the present invention is a bar of combustion or incineration grate, in particular of grid with recoil movement.

 In a manner known per se, such a grid comprises one or more parallel longitudinal tracks, each of which consists of steps, each step consisting of a set of bars transversely juxtaposed.

 The existing systems of bars forming part of a mat of grids with recoil movement, used in particular for the combustion of household waste, are shaped to ensure the distribution of combustion air.

 According to a first design, there is provided between two juxtaposed bars of the same step a slot located in the vicinity of the noses thereof.

 However, the fuel tends to get into this slot, and it is necessary to ensure periodic cleaning.

 According to another design, the combustion air is distributed through an air intake orifice provided on the nerardage nose of at least some of the bars of the grid. The ringing nose has at least one rear face extending substantially transversely to the direction of movement of the fuel on the grid and two faces extending substantially parallel to the direction of movement of the fuel. More specifically, the aforementioned orifice is produced through the rear face of the tacking nose.

 However, for a grid with backward movement, during the downward movement of the bars towards the rear, combustion elements can be introduced into the air intake holes thus causing their obstruction and therefore an imbalance in the combustion air distribution.

 The object of the present invention is to solve the aforementioned drawbacks by proposing an improved combustion or incineration grate bar ensuring regular, and therefore controlled, distribution of the combustion air.

 The solution, in accordance with the present invention, to solve the aforementioned technical problem consists of a bar of combustion or incineration grate, in particular of a grate with recoil movement, of the aforementioned type comprising a nerding nose, characterized in that 'air intake orifice is provided through each of the two lateral faces of the nose, so as to distribute the air flow substantially perpendicular to the direction of movement of the fuel.

 Indeed, the movement of the nose relative to the fuel is then tangential, and the friction of the nose-of the bar on the fuel, combined with the flow of combustion air, ensures the cleaning of the air intake orifice (s).

The invention will be better understood, and other objects, characteristics, details and advantages thereof will appear more clearly during the explanatory description which follows, made with reference to the appended schematic drawings given solely by way of nonlimiting example. illustrating a currently preferred embodiment of the invention and in which:
- Figure 1 is a top view of a bar according to the present invention; and
- Figure 2 is a sectional view along line II-II of Figure 1.

 FIGS. 1 and 2 therefore show a rod 1 of a combustion grate with a backward movement.

 This bar has an upstream end 2 provided with a ringing nose 3 intended to stir the fuel layer during its movement from one end to the other of the hearth on the grid.

 The ringing nose 3, of substantially primo-trapezoidal shape, for the example shown, comprises a front face 4 and a rear face 4 ′ trapezoidal having a common edge, and extending substantially transversely to the direction F of movement of the fuel . The ringing nose also has two triangular lateral faces 5, 5 ′, extending substantially parallel to the direction of movement of the fuel.

Each side face 5 is provided with an orifice 6 for admitting air blown under the combustion grate
Thus, unlike the bars of the prior art, where the air exited the bar in a direction substantially parallel to the direction of movement of the fuel, the positioning of the orifice 6, in accordance with the present invention, allows the distribution of the flow air substantially normal to the direction of movement of the fuel.

 This air distribution, combined with the tangential movement of the lateral faces 5 ensures the cleaning of the orifices 6 while preventing their obstruction by the material in combustion.

 Each bar according to the present invention can be provided with a single ringing nose as shown in FIGS. 1 and 2 or with several transversely juxtaposed noses, in the case of a bar of greater width.

Claims (1)

 CLAIM  Bar of combustion or incineration grate, in particular of a grate with a backward movement, of the type comprising a ringing nose having at least one face extending substantially transversely to the direction of movement of the fuel on the grate and two lateral faces s' extending substantially parallel to the direction of movement of the fuel; and having at least one combustion air intake orifice, characterized in that said air intake orifice (6) is provided through each of the two lateral faces of so as to distribute the air flow substantially perpendicular to the direction of movement of the fuel.