Wall protection from downward flowing solids
AssigneeThe Babcock & Wilcox Company
InventorsDavid J. Walker, Donald L. Wietzke, Gary L. Anderson, Richard F. Romansky, Jr.
Life of this patent
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Abstract
A tube wall, division wall, or wing wall section (10) for a circulating fluidized bed boiler with improved erosion resistant characteristics has a reduced diameter tube section (40) adjacent the refractory covered by an abrasion resistant refractory tile (60). The refractory tile (60) is mounted to the reduced diameter tube section (40) with the upper edge of the refractory tile outside of or not extending beyond a solids fall line of solids in the fluidized bed to eliminate exposed discontinuities.
Claims20
A tube wall section for a circulating fluidized bed boiler having a refractory covering, the tube wall section including a plurality of tubes arranged parallel to each other forming a wall, at least one side of the wall of tubes being an interior wall, each tube comprising:
- an upper tube section having a first diameter, the side of the upper tube section forming the interior wall defining a solids fall line;
- a reduced diameter tube section having a second diameter which is smaller than the first diameter;
- an eccentrically swaged tube section connected between the upper tube section and the reduced diameter tube section;
- a plurality of membrane bars connecting the upper tube sections of each of the plurality of tubes;
- and
- refractory means mounted over the plurality of tubes and covering at least a part of the swaged tube portion and reduced diameter portion of each tube, the upper edge of the refractory means being outside the solids fall line.
A tube section for a circulating fluidized bed boiler having a refractory covering, the tube section including a plurality of tubes arranged parallel to each other, each tube comprising:
- an upper tube section having a first diameter, the side of the upper tube section defining a solids fall line;
- a reduced diameter tube section having a second diameter which is smaller than the first diameter;
- an eccentrically swaged tube section connected between the upper tube section and the reduced diameter tube section;
- a plurality of membrane bars connecting the upper tube sections of each of the plurality of tubes;
- and
- refractory means mounted over the plurality of tubes and covering at least a part of the swaged tube portion and reduced diameter portion of each tube, the upper edge of the refractory means not extending beyond the solids fall line.
Dependencies are inferred from the claim text.