| 摘要 |
<p>A milk pasteuriser (200) has a heat regenerator having two heat exchanger sections (202, 104). Water is circulated round fluid flow path (216) by a water pump (214), which path as fluid flow paths in the regeneration section (204). Raw milk is passed through the heat exchanger section (104) to be heat treated in stream section (108), passed into a holding tube (103) to be fully pasteurised, into the heat exchanger section (202) to a chiller section (102). The water in the circulation loop (216) transfers heat from the pasteurized milk passing through heat exchanger section (104). A food-safe colorant is present in the water in the circulation loop which, if it leaks into the product, is detected by an optical sensor (218). The controller (220) responds by operating a divert valve (222) to direct the treated product away from a batch tank to disposal tank. This provides for continuous heat exchanger leak monitoring during normal operation of pasteurisation of milk.</p> |
