초록 ▼

An apparatus for roasting vegetable bulk material, in particular coffee beam is disclosed, in which essentially all of the cooling waste air of a cooler which cools the bulk material after the roasting operation is heated to roasting-gas temperature in a heat-exchanger stage and fed to the roaster.

An apparatus for roasting vegetable bulk material, in particular coffee beam is disclosed, in which essentially all of the cooling waste air of a cooler which cools the bulk material after the roasting operation is heated to roasting-gas temperature in a heat-exchanger stage and fed to the roaster. Essentially all of the roasting waste gases are heated, in a heating stage, to an extent which is necessary for increasing the temperature of the cooling gases to the roasting-gas temperature. Since the roaster operates with a higher roasting-gas throughput than hitherto, it is possible, with comparable roasting capacity, for the roasting-gas temperature to be reduced, this resulting in a more uniform roasting result. The apparatus has reduced harmful-substance emission along with increased thermal efficiency. Also disclosed is a method of roasting and cooling bulk material by utilizing the disclosed apparatus.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for roasting vegetable bulk material, comprising:a) a heating means for heating a cooling-gas stream discharged from said cooling means, thereby producing a roasting-gas stream;b) a roasting means for roasting said bulk material by contact with said roasting-

[ What is claimed is:] [1.] An apparatus for roasting vegetable bulk material, comprising:a) a heating means for heating a cooling-gas stream discharged from said cooling means, thereby producing a roasting-gas stream;b) a roasting means for roasting said bulk material by contact with said roasting-gas stream;c) a cooling means for cooling said roasted bulk material, whereby said cooling means receives the roasted bulk material from said roasting means, cools said material in a cooling-gas stream and discharges at least a fraction of its cooling gases to said heating means;whereby the heating means comprises a heat-exchanger stage supplied by heating gases, which increases the temperature of essentially all of the cooling gases discharged from said cooling means to a temperature permitting the bulk material to be roasted so as to generate a roasting-gas stream, and discharges said roasting gas to said roasting means.