This paper deals with the flow field and particles behavior of the cold flow model of a circulating fluidized bcd(CFB) heat exchanger. Heat recovery from flue gas out of industrial furnaces, boilers and incinerators for better use of energy resources is a nationwide concern in most industrialized countries. To overcome the fouling of fly ash on the heat transfer surface and erosion and required periodic cleaning, which are the major drawbacks in conventional heat exchangers for flue gas heat recovery, circulating fluidized bed (CFB) heat exchangers are seriously studied by many investigators. Recently, a CFB heat exchanger model without a baffle-plate is devised by our research group. One of the main advantages of this model is the reduced pressure drop through the entire heat exchanger system, while increasing heat transfer performance. Starting from a single riser system with multiple down comers, multi-riser system is also studied. However, due to the operational complexity, these two models are not readily applicable to real applications. As a derivation of our previous studies regarding the non-baffle type CFB heat exchangers, third generation model of the heat exchanger is now under investigation. In the present study, the particulate flow behavior is observed at varying flow rate along with the change in particle size. Pressure loss with and without particle ingestion is also measured and the system feature is discussed.
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