Apparatus for rapid, high volume production of solid co2...

F - Mech Eng,Light,Heat,Weapons – 25 – J

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F25J 1/00 (2006.01) F17C 7/00 (2006.01) F17C 7/04 (2006.01)

Patent

CA 2464652

A lightweight, highly mobile and efficient apparatus (34) for instantaneously producing a high volume of solid carbon dioxide (CO2) pellets. The apparatus utilizes liquid CO2 that is discharged and expanded through a nozzle or nozzles and expanded to reach a triple point condition where liquid, gaseous and solid phases can coexist and flash to a mixture of CO2 in a gaseous phase and particles of snow by a process well known in the art. The gaseous CO2 (80) is discharged into the atmosphere or recovered for converting back to liquid. The snow particles are aggregated into larger flakes and compressed into pellets in a compression structure by a rotor (82) with radially movable blades (90) forming variable volume pockets (92) associated with the interior of a housing to compress the flakes into pellets. The pellets may be discharged from the housing into an airlock which includes a rotor (118) to convey the pellets to an air discharge (142) that is isolated from the compression structure to facilitate conveyance of the pellets to a point of use, such as the site of a fire in order to extinguish the fire.

L'invention concerne un appareil (34) léger, efficace et à grande mobilité permettant de produire instantanément des granules solides de dioxyde de carbone (CO2) à grand débit. Cet appareil utilise du CO2 liquide qui est libéré et expansé par une ou plusieurs buses et expansé pour atteindre un état de point triple dans lequel les phases liquides, gazeuses et solides peuvent coexister et se vaporiser instantanément en un mélange de CO2 en phase gazeuse et de particules de neige au moyen d'un processus bien connu dans le domaine. Le CO2 gazeux (80) est libéré dans l'atmosphère ou récupéré pour être reconverti en liquide. Les particules de neige sont agrégées en flocons plus grands et comprimés en granules de façon à former une structure de compression au moyen d'un rotor (82) pourvu de lames à déplacement radial (90) formant des poches à volume variable (92) associées à l'intérieur d'un logement afin de comprimer les flocons en granules. Ces granules peuvent être libérés à partir du logement dans un sas qui comprend un rotor (118) servant à transporter les granules dans une évacuation d'air (142) isolée de la structure de compression afin de faciliter le transport des granules vers un point d'utilisation, tel que le site d'un incendie, afin d'éteindre l'incendie.

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