Simple design of a crossflow moving bed heat exchanger-filter (MHEF)

Abstract

In industrial applications hot combustion gases are often used in direct-contact gas-solid heat exchangers, such as fluidized bed, fixed bed and moving bed exchangers(1). Granular beds are also often used for filtering dust particles carried by fluids(2). However, hot gas filters and gas-solid heat exchangers have been studied and designed separately and little consideration has been given to devices where heat exchange and filtration take place simultaneously. This paper describes the design of a crossflow moving bed heat exchanger-filter (MHEF)(3), a device which uses a moving granular bed for simultaneous dust filtering and heat recovery from hot gases. Charts are presented for determining the dust concentration leaving the device, contact area needed for a required dust concentration or temperature in the effluent gas, and other parameters of practical interest.