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.
Claims19
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 radar level gauge arranged to repeatedly measure a distance in said fluidization vessel from a reference point to at least one portion of the top surface of the fluidized sand bed, and to provide a measurement signal representative of said distance.
A method for monitoring a fluidized bed in a bubbling fluidized bed combustion device comprising a fluidization vessel and a fluidized sand bed arranged in said fluidization vessel, said method comprising
- providing at least one radar level gauge in or at said fluidization vessel;
- and
- repeatedly measuring a distance in said fluidization vessel from a reference point to at least one portion of the top surface of the fluidized sand bed using said radar level gauge.
A method for monitoring a fluidized bed in a bubbling fluidized bed combustion device comprising a fluidization vessel, a fluidized sand bed arranged in said fluidization vessel, gas supply means arranged to supply gas to fluidize said sand bed, and fuel supply means arranged to supply fuel to said sand bed, said method comprising
- providing at least one radar level gauge in or at said fluidization vessel, said radar level gauge operating within a frequency range of 35-100 GHz;
- repeatedly measuring a distance in said fluidization vessel from a reference point to at least one portion of the top surface of the fluidized sand bed using said radar level gauge;
- repeatedly determining a bed state parameter based on a measurement signal from said radar level gauge being representative of said distance, said state parameter being one of said distance, a level of said fluidized sand bed, or a height of said fluidized sand bed;
- repeatedly determining a variation of said bed state parameter including determining an amplitude and a frequency of said variation based on current and previously determined bed state parameter values;
- repeatedly storing data in a memory, said data including at least one of the determined bed state parameter, the determined amplitude, and the determined frequency;
- applying a diagnostic algorithm to at least a subset of said stored date to determine if said fluidized sand bed comprises agglomerated or sintered sand particles, said diagnostic algorithm including determining if said determined frequency is changing over time, and if so indicating that said fluidized sand bed comprises agglomerated or sintered sand particles;
- controlling combustion in said fluidized sand bed by controlling said gas supply means and/or said fuel supply means based on at least one of the determined bed state parameter, the determined frequency and the determined amplitude;
- and
- operating the combustion device at a temperature between 750-900° C.
Dependencies are inferred from the claim text.