Liquid heaters and vaporizers – Industrial – Port
Patent
1997-04-16
1998-07-07
Bennett, Henry A.
Liquid heaters and vaporizers
Industrial
Port
12223511, 12223512, 12223522, F22B 3700
Patent
active
057752656
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a cooling surface cladding for polygonal chambers of steam generators with hopper-shaped floor and fired on the circulating fluidized bed principle, which consists partially of substantially vertical finned tubes extending in the manner of walls between manifolds and converging curves in the floor region to form a hopper.
BACKGROUND OF THE INVENTION
It is a known method to clad the wall surfaces in steam generators with polygonal combustion chamber cross-section with horizontal or slightly rising and/or with vertical finned tubes on a large surface. Although it is a known procedure to provide complicated tube constructions in realizations, especially in the combustion region, smaller surface parts are walled in and are thus removed from their utilization as cooling surfaces. Hoppers are clad, if at all, by slightly rising tubular bands in the manner of threads.
It is known from U.S. Pat. No. 4,576,120 A and U.S. Pat. No. 4,537,156A to bend tubular walls at an angle to form a combustion chamber hopper and to take the different tube length into account by means of stepped manifolds. This has the disadvantage that many manifolds must be connected, so that this design is not used for small hoppers, i.e. non-combustion chamber hoppers. Also, the utilization of our design is possible even with slightly heated tubular walls, while the utilization of the known design in non-radiation heating surfaces (outside the combustion chamber) may lead to circulation difficulties which can be safely avoided thanks to the partial incorporation into the downpipe system according to our invention.
Modern firing systems, such as for example the circulating fluidized bed combustion, require greater attention to small, generally hard to cool partial surfaces in view of economy, and a special wall design, in particular in the hopper and/or cyclone or recycling part. Since lined wall elements reduce the start-up speed, they should be avoided as much as possible.
OBJECTS AND SUMMARY OF THE INVENTION
The invention has as its object to incorporate also components not belonging to the combustion chamber and in part small components into the cooling system and to provide a finned tube wall connected to the circulation of the steam generator by means of a special configuration of the components and/or of the lining tubes.
The invention is characterized in that two finned tube walls across from each other in the hopper area, as seen from above, constitute first a hopper wall which is inclined from the vertical, and then at least one hopper wall with a diminishing width and in part inclined manifolds, and in that the adjacent tube wall and the tube wall across from it in the hopper area (as seen from above) constitute a lateral wall of the hopper which is inclined from the vertical with diminishing width and inclined manifolds and then with constantly diminishing width.
In certain embodiments, inclined manifolds are connected to the tube wall by connection pieces installed at an angle to the axis of the manifold. The inclined manifolds of adjacent walls may be positioned at different heights. Also, a lower inclined manifold may be located in the downpipe system of the steam generator so that the finned tube wall belongs in part to the downpipe system and in part to the ascending pipe system.
When two adjacent hopper chambers are separated from each other by an intermediate wall heated on both sides, as in one embodiment in accordance with the invention, the tubes of the intermediate wall are continued alternately into an inclined hopper wall. On the other hand, when two adjacent hopper chambers without an intermediate wall are clad, the tubes of the intersecting inclined hopper walls are taken into the adjoining vertical hopper wall and only the longer portion of the vertical tubes of the intersecting inclined hopper walls are introduced into the inclined manifolds.
The essential advantages of the invention lie in the fact that in spite of the difficult pipe arrangement, more he
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Brandle Bernd
Gilli Paul
Holblinger Werner
Seidelberger Emmerich
Austrian Energy & Environment SGP/Waagner-BIRO GmbH
Bennett Henry A.
Lu Jiping
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