Ring-shaped hanging heat transfer screen of circulating fluidized bed boiler furnace

Abstract

The invention discloses a ring-shaped hanging heat transfer screen of a circulating fluidized bed boiler furnace. The heat transfer screen comprises a hanging platen superheater, a reheater and screen pieces of a water-cooling screen, wherein the screen pieces are composed of a pipe of a circulating heating medium and fins, a plurality of screen pieces are encircled to form a ring-shape or a half-ring-shape single unit-hanging screen, and the screen pieces are connected in an overall or partial manner.

Description

Technical field: [0001] The invention relates to a new type of suspended heat exchange screen structure, which is suitable for a suspended screen heat exchanger in the furnace of a large circulating fluidized bed boiler. Background technique: [0002] As the capacity of the circulating fluidized bed boiler increases, the area of ​​the heating surface that needs to be arranged in the main circulation loop (furnace, separator and return system loop) increases. Among them, arranging the panel heating surface on the upper part of the furnace is a common design. [0003] At present, most of the suspended panel heat exchangers of circulating fluidized bed boilers are arranged in parallel with one piece in structure, and are arranged in the upper area of ​​the furnace in a wing wall manner. With the increase of boiler capacity, especially in the process of boiler development towards supercritical and ultra-supercritical parameters, large-scale circulating fluidized bed boilers often need ...

AI Technical Summary

Problems solved by technology

[0009] The present invention overcomes the problems of heat transfer efficiency, rigidity and service life brought about by the large and long suspended heat exchange screen monolithic screen of the existing large-capacity circulating fluidized bed boiler, and provides a more suitable for the current large-capacity circulating fluidized bed boiler. The suspended heat exchange screen of the bed boiler allows more heating surfaces to be arranged in the main circulation loop, which can make better use of the furnace space and meet the requirements of boiler steam parameters and loads. At the same time, it can increase the utilization rate of the furnace space and reduce the height, enhance the strength of the suspended heat exchange screen, avoid overheating, and improve its service life

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