Chemetron

Peter A Students

A nozzle for a carbon dioxide snow cyclone separator shapes the swirling discharge from the separator to form a unidirectional downwardly directed flow. The nozzle passage is defined by an annular series of transversely concave, juxtaposed, elongate surfaces formed in the body of the nozzle, whereby the passage is scalloped in transverse cross-section. In preferred forms, there are four identical, laterally contiguous, surfaces in the annular series defining the nozzle passage, each of which extends through an arc of .pi. radians.

Shaper nozzle for a carbon dioxide snow cyclone separator

A compact, high-efficiency, J-tube carbon dioxide snow hood has a novel diffuser at the discharge end of the J-tube for providing a well-confined, concentrated snow deposit at a reduced exit velocity. The diffuser includes a pair of juxtaposed, axially upright cylindrical baffles which intercept the fine-particle snow discharge from the J-tube in a manner to create counterswirling currents of carbon dioxide snow. An upright cylindrical tube circumscribing the cylindrical baffles, and depending substantially beyond the lower ends of the baffles, forms a mixing chamber where the segregated counterswirling currents of carbon dioxide snow interact to form desired larger-particle snow which is then passed from the chamber in a confined, low velocity, downwardly directly discharge. The vapor discharge from the J-tube is directed through an exhaust duct in the side wall of the snow hood such that carbon dioxide vapor in the discharge from the mixing chamber is removed by aspiration as is the vapor formed by sublimation of the snow beneath the hood.

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West Chester, IL, United States of America

Peter A Students