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A New UHT Non-Vacuum Cream Pasteuriser Part II. Pilot Plant Processing Characteristics

Authors: W.C.T. Major


The pilot plant described in Part I effectively UHT pasteurised (280°F) and deodorised choice, first and second grade creams at 11,000 lb per hour using 0.9 lb steam per 10 lb cream treated, as compared with 3.5 to 5.7 lb steam per 10 lb cream for the steam injection pasteurisation/vacuum deodorising methods currently used in Australian butter factories.

No dilution occurs at pre-heating temperatures in excess of 200°F as shown by the identical fat contents (Babcock) of the cream entering and leaving the process; but at lower pre-heating temperatures dilution does occur (less than 2% from 190-199°F; less than 4% from 180-189°F; less than 6% from 170-179°F).

Heat saved by regeneration due to the high temperature (212°F) of the processed cream returned to the plate heat exchanger, is greater than the heat in the steam flowing to the machine, that is, more heat is applied by regeneration than by steam injection.

As at least 50% of the heat in the steam flowing to the pilot plant was recovered for use elsewhere in the factory (e.g. boiler feed or hot water system), the net steam cost was not more than one eighth of that for current plants.

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