| 摘要 |
When cooling of a product (2) is required a small amount of liquid nitrogen (4), or other cryogenic fluid, is fed to a spray nozzle (9). This is followed by a pulse of dry nitrogen gas (5) at a higher pressure than the liquid, causing its pulverisation into smaller droplets than would be the case if pulverisation were carried out by the liquid pressure alone. Preferred features: the propulsion gas and cryogenic liquid both have the same composition. The gas is supplied at approximately ambient temperature, much higher than the liquid temperature, and at a pressure higher than the liquid pressure.
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