Heating – With work cooling structure – Combustion feed air cools exiting work by contact
Patent
1995-03-22
1998-08-04
Walberg, Teresa J.
Heating
With work cooling structure
Combustion feed air cools exiting work by contact
110268, 110281, 126163R, 432 77, F27D 1502
Patent
active
057884803
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a grate element for a grate surface, e.g. in a clinker cooler, which grate element is shaped in the form of a box, between the walls of which a number of grate surface-defining grate bars are mutually arranged so that, between them, they form fine gas channels. Such a grate element is hereinafter referred to as "of the kind described".
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.
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 so that an even distribution of the gas across the entire grate surface is achieved. 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.
A grate element of the above kind is known from the EP-A-167658, which comprises 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, this grate element has the disadvantage that its construction will not ensure a sufficient cooling of the grate surface itself, and that the wear induced as a result of the hot clinker being deposited directly on this surface will, therefore, be relatively large. Further, this known grate element is not constructed in such a way that it prevents falling-through of clinker material. A further disadvantage 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.
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 and hence 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 of the kind described is characterized in that the grate bars alternately consist of bars having a substantially rectangular cross-section and bars having a cross section substantially of the form of an inverted T, in that the rectangular bars overlap the transverse flanges of the T-bars, each of which flange is provided at the free end thereof with an upwardly projecting, longitudinal bead; and in that each of the rectangular bars has at each side edge a longitudinal bead depending downwardly towards respective ones of the T-bar flanges.
It is hence ensured that the cooling gas is led through the grate element in such a manner that the grate bars with rectangular cross section, which constitute the greatest part of the grate surface, and which are the parts of the grate element exposed to the greatest thermal load, are effectively cooled. This is due to the fact that the largest pressure loss throug
REFERENCES:
patent: 1438190 (1922-12-01), Skelly
patent: 1491811 (1924-03-01), Miller
patent: 4776287 (1988-10-01), Moreau
patent: 4870913 (1989-10-01), Schneider
patent: 5174747 (1992-12-01), Massaro, Jr. et al.
patent: 5322434 (1994-06-01), Milewski et al.
patent: 5433157 (1995-07-01), Dittmann et al.
Bentsen Bo
Massaro Michael Robert
F. L. Smidth & Co. A/S
Lu Jiping
Walberg Teresa J.
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