Heating – With work cooling structure – Combustion feed air cools exiting work by contact
Patent
1984-04-05
1986-11-25
Makay, Albert J.
Heating
With work cooling structure
Combustion feed air cools exiting work by contact
34 62, 34168, 432 80, 432 96, F27D 1502
Patent
active
046246363
ABSTRACT:
A two stage material cooling apparatus for cooling hot particulate material such as cement clinker discharged from a furnace such as the rotary kiln. The first stage includes a direct heat exchanger such as a reciprocating grate type heat exchanger or an attached tube cooler and serves primarily as a heat recuperator. This cooler acts on the principle of direct heat exchange between cooling gas and the hot material whereby the material is cooled and the gas is heated and returned to the kiln as preheated secondary air for combustion. The second stage cooler is a shaft type cooler with gas permeable sides so that cooling gas passes through the material generally perpendicular to the flow of material. The gas which is supplied to the second cooler can come from recirculated cooling gas or from ambient. The gas discharged from the second cooler can be supplied directly to the gas inlet of the first cooler recirculated to its inlet after passing through an air to air heat exchanger. In a preferred embodiment, the second cooler includes an arrangement whereby some of the cooling gas is supplied for passage through the material in the second cooler perpendicular to the flow of material and some of the gas is supplied so that it flows countercurrent to the flow of material in the second cooler for direct supply to the first cooler or to the furnace.
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Fuller Company
Makay Albert J.
Thomson Frank H.
Westphal David W.
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