Circulating fluidized bed boiler multiple-point return feeder

Abstract

The invention provides a high-temperature material returning device for circular fluidized-bed boiler, and is capable of sending back the high-temperature material to the hearth in a manner of multiple points, so as to reduce the unevenness of fluidization and temperature when the material is collectively returned to the bed surface in large area. Having simple expansion characteristic, the invention includes a vertical declining section, a vertical rising section, and a level section for connecting with the bottoms of the declining section and the rising section and an air distributing device. The upper part of the rising section is provided with at least two overflow ports of equal height, wherein, each overflow port is connected with a returning section. The ration between the section areas of the rising section and the declining section is large than or equal to 1. The level section is a vertical pole having a horizontally symmetric axle. The plane containing the horizontally symmetric axle and the central line of the declining section is a symmetric plane of a multi-point back feeder of the circular fluidized-bed boiler. The rising section is a vertical pole; the width of the section is larger 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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