Bubbling Fluidized Bed Combustion Device and Method for Monitoring the Fluidized Bed in Such a Combustion Device

摘要

A bubbling fluidized bed combustion device (1) comprising a fluidization vessel (2), a fluidized sand bed (3) arranged in the fluidization vessel and an arrangement for monitoring the fluidized sand bed. The arrangement comprises at least one radar level gauge (4) arranged to repeatedly measure a distance (D) in the fluidization vessel from a reference point (5) to at least one portion (6) of the top surface of (7) the fluidized sand bed, and to provide a measurement signal (S) representative of the distance. The invention also relates to a method for monitoring a fluidized bed in a bubbling fluidized bed combustion device.