Heating – With work cooling structure
Patent
1982-04-21
1984-07-31
Camby, John J.
Heating
With work cooling structure
165 96, 432 83, 432148, 432198, F28F 2700, F27D 1502, F27B 900, F27B 504
Patent
active
044627971
DESCRIPTION:
BRIEF SUMMARY
The present invention is with respect to the design of the cooling zone of a firing kiln made up of a preheating zone, a firing zone and a cooling zone, and more specially a roller kiln through which the material to be fired, more specially ceramic tiles or panels, is moved in a single layer without using any burning tools of refractory material.
In such a roller kiln designed for firing material in a single layer and without any burning tools of refractory material, the material to be fired makes its way through the preheating zone, the firing zone and the cooling zone on a line of rollers made up of a special-purpose steel or ceramic refractory material and powered from a point outside the kiln. The specially useful effect of such kilns is that they make do without using carriages and refractory burning tools. Such transporting and supporting parts do in fact have a great mass which has to be heated up by the kiln and then cooled down again in the cooling zone so that one may see that a great part of the heat input to the kiln for the purpose of heating up the material to be fired is in fact wasted.
In such kilns firing goods in a single layer and without using transport carriages and burning tools not only is much less heat needed, but furthermore the firing operation takes place more quickly and more evenly so that the production cycles are very much shorter.
The cooling zone of such a kiln is generally run to give a quenching effect, that is to say great enough amounts of air are forced into the cooling zone to take effect on the goods. However one undesired effect of this is that, even if the firing zone is separated from the cooling zone by a curtain, the cooling zone has effects on the firing zone and, if the firing zone is run under reducing conditions, the fired goods will be reoxidized in the cooling zone again and at least in the part of the firing zone next to the cooling zone. For one way of stopping the goods from becoming reoxidized in the cooling zone and stopping such a reoxidizing effect taking place in the part of the firing zone next to the cooling zone, see, for example, German Offenlegungsschrift specification No. 2,824,367 in which the input of materials for reduction in the cooling zone, into the kiln with a high pressure is intermittent, the amounts and the timing of such material being such that the amount, still unused, of reducing material after part-reduction is so low that it is burned off by the neutral kiln atmosphere in the times in which there is no supply of reducing material, no further supply thereof in addition being needed in such times for burning off the reducing substances.
It will be seen that for running such a process a very complex control system is needed.
The purpose of the invention is to make use of a very simple system for producing the desired effect of the fired goods in the cooling zone and the part next thereto by the atmosphere of the cooling zone and for this reason stopping any reoxidation of the fired goods, while at the same time making it simple for effects to be produced on the outer face of the fired goods.
For effecting this purpose in the invention the cooling zone is indirectly cooled by a current of heat vehicle, more specially a liquid heat vehicle, and the cooling zone has inlet systems, able to be changed in direction and in their rate of input, for materials taking effect on the outer face of the goods being kilned.
On using a liquid heat vehicle, for example water, forced through the tube coils into the cooling zone over the kilned goods, there is a sharp, quick quenching of the kilned goods in the cooling zone without however any danger of changing the atmosphere, as would be the case on pumping in cooling air. At the same time however an atmosphere is produced in the cooling zone which is generally at rest and it is now possible for air or any other material having a desired effect on the outer face of the kilned goods, to be let into the cooling zone, the amount and direction of the material being controlled. To take an example, fo
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patent: 3500899 (1970-03-01), Shane, Jr.
patent: 4256606 (1981-03-01), Noack et al.
patent: 4334505 (1982-06-01), Jablin
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