How to design the outlet for discharging waste catalyst during shutdown of a large-diameter fluidized bed

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Large-diameter fluidized beds: Due to constraints such as height limits on domestic traffic overpasses, the maximum allowable diameter is 4 meters for fluidized beds； Waste contactor discharge: It cannot be discharged during the production process due to special operating conditions (high temperature, high pressure, etc.); it can only be discharged after the plant is shut down for replacement ； There are issues with emissions: The outlet for discharging waste is currently located near the upper edge of the distributor. However, due to the angle at which waste accumulates, the large-diameter fluidized bed distributor has a concave design. Once air passes through this outlet, dozens of tons of waste remain in the fluidized bed, posing a significant risk to personnel who attempt to clean it up. I would like to ask the experts: how can such fluidized bed waste discharge nozzles be optimized in design? Thank you very much for your guidance!