Circulating fluidized bed boiler multiple-point return feeder

Abstract

The high-temperature material return device of the circulating fluidized bed boiler of the present invention can send the high-temperature circulating material back to the furnace at multiple points, reduce the fluidization and temperature inhomogeneity caused by the centralized return of the material to the large-area bed surface, and also has the advantages of Simple expansion characteristics; including a vertical descending section, a vertical ascending section, a horizontal section connecting the bottoms of the two, and corresponding air distribution devices, the upper part of the ascending section is provided with at least two overflow outlets of equal height, and Each overflow port has a return section connected to it; the ratio of the cross-sectional area of ​​the ascending section to the descending section is ≥1; the horizontal section is a vertical cylinder with a horizontal axis of symmetry; the axis of symmetry is aligned with the center of the descending section The plane where the line is located is the symmetry plane of the multi-point feeder of the circulating fluidized bed boiler; the ascending section is a vertical column whose cross-sectional width is greater than the depth.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler, in particular to a high-temperature circulating material return device for a circulating fluidized bed boiler. Background technique [0002] The material return device is a key component in the circulating fluidized bed boiler, and together with the furnace and the separator, it forms a high-temperature solid material circulation loop. The main function of the return device is to continuously and stably return the solid material with higher temperature from the low-pressure area to the high-pressure area, and prevent the flue gas from flowing back. [0003] Research on material return devices has been going on for many years. Non-mechanical valves have been widely used because they overcome the disadvantages of mechanical valves that are easy to jam, wear, high-grade materials, and expensive at high temperatures. At present, the most widely used non-mechanical high-temperature circulating m...

AI Technical Summary

Problems solved by technology

The number of return openings on the side wall of the furnace corresponding to this kind of feeder is doubled compared with the conventional feeder, which can effectively reduce the inhomogeneity caused by the concentrated return on the large bed, but this return There are many inclined pipes in the return section of the device and the connecting pipe with the side wall of the furnace. The expansion design is difficult, and the expansion sealing and deformation problems are prone to occur, which affects the operation safety.

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