Grate bar and grate for a step-grate stoker

Abstract

The invention concerns a grate bar and a grate for a step-grate stoker that is used in the field of furnaces for refuse conversion units. The invention thus relates, according to a first aspect, to a grate bar for a stoker of an incinerator, comprising a tray whose upper surface makes it possible to receive the incinerated elements and which extends with a rear end and a front end each forming a return serving as a bearing point for the bar. The bar also comprises a longitudinal projection situated under the tray and extending at least partially between the rear and front ends of the bar. The invention is characterized in that at least one angular cutting element or cutter is placed under the tray, on a first side of the longitudinal projection, having the function of facilitating the evacuation of the progressively accumulated refractory materials. Under the tray and on one side of the longitudinal projection, the grate bar comprises one or more cooling side wing, possibly, arranging with a side cavern allowing gas to ventilate. The grate comprises at least one grate bar or a set of three grate bars. In a second condition, the central grate bar of which is able to move relatively to the two side bars.

Description

technical field [0001] The subject of the invention is bars and grates for stokers with stepped grate furnaces. It is mainly used in the furnace field of furnace waste conversion units, such as public waste, industrial, domestic or medical waste, water treatment sludge, or real powder. Background technique [0002] The problem of waste incineration has been a problem in our society for a long time, and our society is still creating more and more waste incineration problems. In fact, furnaces designed for waste incineration have existed for many years and have been continuously improved to date. For example, these improvements include known furnaces, such as grate furnaces, roller-hearth furnaces or fluidized-bed furnaces, in which waste material is emptied through a hopper to the The conveyor consists of movable steps that mix and propel the waste material forward into the combustion chamber. Thus, these furnaces burn waste materials so that polluting products are reduced...

AI Technical Summary

Problems solved by technology

These bars are particularly limited to the aforementioned bars whose main part is in the shape of an inverted "U" since the path of travel of the particles removed between the bars corresponds to the thickness of the flattened portion, making this path shorter Defects

[0008] However, these bars do not adequately prevent the continuous accumulation of refractory material between and below the bars

This accumulation can then lead especially to the reciprocating movement of the grate bars being prevented

It also leads to an increase in the spacing between the bars, which hinders the movement of the grate and makes it more difficult to regulate the combustion

In practice, this can result in having to stop production in order to clean or replace one or more bars, especially due to the mechanical wear that accompanies this continuous build-up of refractories

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