Bubbling fluidized bed combustion device and method for monitoring the fluidized bed in such a combustion device
AssigneeVattenfall AB
InventorShahriar Badiei
Life of this patent
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Abstract
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.
Claims21
A bubbling fluidized bed combustion device comprising
- a fluidization vessel;
- a fluidized sand bed arranged in said fluidization vessel;
- and
- an arrangement for monitoring said fluidized sand bed, said arrangement comprising at least one microwave radar level gauge arranged to repeatedly measure a distance in said fluidization vessel from a reference point to at least one portion of the sand at the top surface of the fluidized sand bed, by transmitting microwave pulses or microwaves which are reflected directly off the sand at the top surface of the fluidized sand bed without aid of another reflection member, and to provide a measurement signal representative of said distance.
A bubbling fluidized bed combustion device comprising
- a fluidization vessel;
- a fluidized sand bed arranged in said fluidization vessel;
- and
- an arrangement for monitoring said fluidized sand bed, said arrangement comprising at least one microwave radar level gauge arranged to repeatedly measure a distance in said fluidization vessel from a reference point to at least one portion of the sand at the top surface of the fluidized sand bed, by transmitting microwave pulses or microwaves which are reflected directly off the sand at the top surface of the fluidized sand bed, and to provide a measurement signal representative of said distance,
- wherein the processing unit is configured to repeatedly determine a variation of said bed state parameter including determining an amplitude and/or a frequency of said variation based on current and previously determined bed state parameter values.
Dependencies are inferred from the claim text.