Design of a fluidized bed heat exchanger for CO2 hydrate slurry production

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Abstract

CO2 hydrate slurry is a newly developed secondary cooling fluid. In order to use CO2 hydrate as a direct coolant of fresh products, a new CO2 hydrate slurry production system (a fluidized bed heat exchanger, FBHE) is under construction and it has been optimized for the expected operating conditions. A sensitivity analysis has been used to identify the optimum design for the specific operating conditions. The model includes the growth of CO2 hydrate on the fluidized bed wall as a function of the operating conditions. The heat of formation is removed by a falling film of evaporating R134a outside the fluidized bed. The maximum capacity of the set-up is 5 kW. The parameters optimized include the internal diameter of the fluidized bed heat exchanger, bed porosity, inert particles inside the FBHE, as well as the refrigerant temperature. Under specific operating conditions: pressure inside the FBHE is 35 bars and solution initial temperature is 6°C, the optimized parameters according to simulation are: internal diameter is 85 mm, bed porosity is 0.7, particle diameter is 5 mm, and refrigerant temperature is 0°C. Under these conditions the apparatus produces 13.2 kg hydrate in one hour.
Original languageEnglish
Title of host publicationProceedings of the 4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
EditorsCarlos Infante Ferreira
Place of PublicationParis, France
PublisherInstitut International du Froid
Number of pages9
ISBN (Electronic)978-2-913149-99-1
Publication statusPublished - 2013
Event4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants - Delft, The Netherlands
Duration: 17 Jun 201319 Jun 2013

Conference

Conference4th IIR Conference on Thermophysical Properties and Transfer Processes of Refrigerants
Period17/06/1319/06/13

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