Method and apparatus for fluidized bed combustion
OwnerHenry R. Clootsinventor
Life of this patent
Estimating the term…
Abstract
A method and apparatus for fluidized bed construction in which the fluidized bed is confined in an annular combustion chamber and fuel is injected into the lower portion of the fluidized bed by a centrally located whirling disk having vanes thereon for impelling the fuel and secondary air laterally outwardly. Primary air is provided from a blower jointly driven with the fuel distribution disk and supplying air under pressure to pass upwardly through air supply openings in a grate forming the bottom wall of the combustion chamber, with the jets of air passing through the openings having upward and tangential components of movement so as to impart rotary motion to the fluidized bed in the annular combustion chamber.
Claims34
A fluidized bed combustion apparatus, comprising
- wall means defining an annular combustion chamber having a substantially vertical axis and a coaxially extending central opening,
- grate means extending horizontally across the lower end of said combustion chamber and formed with a plurality of air supply openings therethrough,
- disk means mounted for rotation above said grate means about an axis coincident with said vertical axis of said combustion chamber,
- a bed of non-combustable particulate material in said combustion chamber above said grate means,
- air supply means formed for forcing air under pressure upwardly through said openings in said grate means to fluidize said bed,
- drive means operatively connected to and formed for rotating said disk means,
- and fuel feed means at said central opening in said wall means formed for depositing fuel on said disk means whereby rotation of the latter centrifugally distributes said fuel into said annular combustion chamber above said grate means.
A fluidized bed combustion apparatus, comprising
- a combustion chamber of annular form having coaxially spaced inner and outer cylindrical walls standing on end and laterally extending top and bottom walls with the space within said inner cylindrical wall providing a fuel feed passage opening through said top wall,
- a grate of flattened plate-like form extending across the lower end of said combustion chamber to provide said bottom wall and having a plurality of air supply openings therethrough communicating with said combustion chamber,
- a bed of non combustable particulate matter in said combustion chamber and resting on said grate when said bed is not fluidized,
- air supply means formed for forcing primary air under pressure upwardly through said air supply openings in said grate to fluidize said bed, and
- a fuel distribution disk carried for spinning movement about a vertical axis at the lower end of said fuel feed passage and formed for propelling fuel dropped on said disk from said fuel feed supply passage laterally into said bed.
The method of fluidized bed combustion, comprising the steps of
- confining a bed of non-inflammible particulate material in an annular combustion chamber,
- heating said bed to a temperature sufficient to sustain combustion of the fuel to be burned,
- fluidizing said bed by blowing multiple jets of air into the bottom of said bed,
- accomplishing rotating movement of said bed in said annular combustion chamber by causing said jets of air to be blown into said chamber with upward and tangential components of motion,
- and forceably injecting the fuel to be burned laterally into said bed about a 360.degree. periphery for evenly distributing such fuel into said bed.
Dependencies are inferred from the claim text.