METHOD AND DEVICE FOR ROASTING/COOLING BEAN
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United States of America Patent
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app pub date -
Nov 12, 2010
filing date -
Jun 6, 2008
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Abstract
Operation of roasting machine is stabilized by controlling the flow rate or the temperature of cold air for cooling with high precision when roasted beans are cooled, and efficient roasting/cooling operation is attained at a low cost. In the roasting/cooling method of beans for quickly cooling roasted beans by circulating cold air for cooling while closing the cold air from the outdoor air, the cold air for cooling is cooled by cryogenic brine in a heat exchanger (31) provided in the closed circulation path (30) for the cold air for cooling, inlet temperature of a cooling tank (20) of the cold air for cooling is detected, the flow rate or temperature of cryogenic brine being supplied to the heat exchanger (31) is controlled such that the detected inlet temperature has a set value, the quantity of circulation and the pressure of the cold air in the closed circulation path are controlled by blowers (32, 33) provided in the closed circulation path (30), respectively, on the upstream side and downstream side of the heat exchanger, and cooling of a front batch and precooling of the cooling tank (20) after roasting are carried out in the same time zone as that of roasting of every batch by the roasting machine (11) thus achieving continuous roasting/cooling processing.
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