Fluid-bed Reactivator (FBR)

Fluidised bed technologies are known for their excellent heat and mass transfer. The Fluid-bed Reactivator (FBR) is no different offering up to a 50% energy saving on alternative granular activated carbon (GAC) thermal reactivation technologies. The improved heat and mass transfer rates deliver higher reactivation rates, enabling smaller equipment at a reduced capital cost. The nameplate capacity for the standard FBR400 is 400 kg/hr with a 50% turn-down.

Basic Specification

    GAC Reactivation Rate 400 kg/hr (dry carbon basis)
    Moisture Content of Feed 40%
    Energy Input 5 MJ/kg (dry carbon basis)
    Flue Inlet Temperature 1000C
    Carbon Reactivation Temperature 800C
    Active Surface Area Recovery 400 m/g
    Carbon Loss 6% - 8%
    Flue Exhaust Temperature 450C

It must be highlighted that there is a significant difference between thermal regeneration and thermal reactivation. The former stops short of oxidising the char that remains behind after pyrolysis, thereby fouling the active surface area of the carbon over time. The latter typically utilises steam and the water-gas shift reaction to selectively oxidise this char thereby restoring the active surface area of the carbon. As there is no such thing as 100% selectivity, reactivation technologies run the risk of oxidising the carbon skeleton which results in carbon loss and higher operating costs. A true reactivation technology is capable of maintaining the activity of the GAC at a stable economic level, with no gradual drop off in overall performance.

The FBR has been continuously improved over the last 20 years and is now considered a mature technology. Unfortunately being a fluidised bed technology it is constrained to narrow particle size and density ranges. This means it is only suitable in those applications where contamination from other solids is kept to a minimum, typically closed-loop systems. The sugar & sweetener industry is a good example, where only filtered liquor streams are processed/decolourised by GAC. In such applications, the GAC is maintained in a closed reactivation loop, topped up with less than 10% new/virgin GAC to replenish any carbon lost through attrition and/or reactivation.

A FBR system offers the following benefits to other thermal reactivation systems:

  • Up to 50% reduction in energy consumption

  • Up to 30% reduction in capital cost

  • Flue/producer gas can be directed to stack with no further conditioning or cleaning

The following Fluid-bed Reactivator are available:

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