Stoves and furnaces – Grates
Patent
1994-12-27
1998-02-03
Jones, Larry
Stoves and furnaces
Grates
126163R, F23H 1300
Patent
active
057133450
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a grate element, with gas channels, for a grate surface, e.g. in a clinker cooler.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The function of the grate surface of a clinker cooler, which often comprises a large number of grate elements, is partly to convey clinker material through the cooler and partly to allow the cooling gas to penetrate the clinker material for cooling hereof. The cooling gas is traditionally supplied to all the grate elements of the grate surface via one or very few common, underlying chambers. Given that, in most cases, the clinker material is not homogenous with respect to size, the clinker layer on the grate surface will not be distributed in an even and homogeneous manner, and, therefore, the passage of cooling gas through the different areas of the clinker layer will be very uneven, involving risk that so called "red rivers", i.e. sections of insufficiently cooled clinker, will be formed.
2. Description of the Prior Art
In order to resolve this problem, it has been proposed to provide each grate element in the grate surface separately with cooling gas so that the passage of gas through each single grate element can be controlled in a manner ensuring that the gas is evenly distributed across the entire grate surface. It has also been proposed to provide for a significantly greater pressure loss through the grate surface than through the clinker layer whereby it will mainly be the pressure loss through the grate surface which determines the gas distribution across the grate.
Grate elements of the above kind are known i.a. from EP-A-337383 and EP-A-167658, and both these patent applications indicate solutions to the problem of uneven gas distribution by a combination of a higher pressure loss through the grate and a separate gas supply for each grate element.
In EP-A-337383 a grate element is described, the surface of which is provided with at least one trough for receiving and retaining clinker material for the purpose of minimizing the wear on the grate element and to insulate the grate element from the hot clinker material. The construction of the grate element further ensures that the quantity of clinker material which may fall through the grate is reduced to a minimum since the cooling gas is injected into the material via slots in the upper part of the troughs. However, this grate element has the disadvantages that the troughs will always contain a certain amount of retained material hence causing problems in terms of maintenance, and that larger clinker particles may get stuck in the troughs, hence cutting off the gas passage.
In EP-A-167658 is described a grate element with longitudinal lateral brackets, which define the width of the grate, and a plurality of grate bars extending between and transversely to the brackets, hence forming, between them, a plane surface with transverse gas slots. However, the disadvantages of this grate element are that its construction will not ensure a sufficient cooling of the grate surface itself, and that the hot clinker is deposited directly on this surface hence exposing the grate elements to a relatively significant degree of wear. Further, the grate element is not constructed in such a way that it prevents falling-through of clinker material. Another drawback relates to the manner in which the grate elements are mounted, which makes it difficult to replace the individual grate element, partly because the single grate elements consist of two parts which have to be pushed together, and partly because a whole row of grate elements is assembled by means of common, through-going cross bolts.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a grate element which is so constructed that it will ensure a sufficient pressure loss through the grate, a sufficient cooling of the grate surface, and prevent material from falling through the grate, while simultaneously ensuring uncomplicated mounting and replacement of the grate elements.
According to the invention, a grate element, with gas
REFERENCES:
patent: 4870913 (1989-10-01), Schneider
patent: 5174747 (1992-12-01), Massaro, Jr. et al.
Bentsen Bo
Massaro Michael Robert
F. L. Smidth & Co. A/S
Jones Larry
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