Chinese Academy of Sciences

Qinggang Lu

Ming Gao

Dongyu Wang

Yunkai Sun

Yongjie Na

Shiyuan Li

Haigang Wang

Xiaofang Wang

Guoliang Song

Shaolin Bao

A large-size circulating fluidized bed boiler, comprising: a furnace having a vertical furnace center line; and at least two groups of cyclones, each cyclone of each group of cyclones having an inlet gas pass communicated with the furnace. A furnace cross section formed by outer sidewalls and located at the inlet gas pass of the cyclone is a polygon having 2&#xd7;n sides, and n is a positive integer greater than 1. The polygon is axially symmetric with respect to a perpendicular bisector of each side of the polygon, and when n is 2, the polygon is a square. Triangles formed by two endpoints of an inlet of the inlet gas pass of each cyclone at the cross section and an intersection of the furnace center line and the cross section are congruent. A single flow field in communication with each of the inlet is formed in the cross section.

Large-scale circulating fluidized bed boiler

A water-cooling U-valve is composed of a downcomer (), a riser (), and a return chute (), which are sequentially connected. An intermediate partition () is disposed between the downcomer () and the riser (), the lower parts of the downcomer () and the riser () are interconnected. A material returning partition () is disposed between the riser () and the return chute (), the upper parts of the riser () and the return chute () are interconnected. The casing of U-valve comprises membrane walls, the inside of the membrane walls are laid with refractory. Some water-cooling tubes of the membrane walls extend into the inside of the U-valve, forming the water cooing intermediate partition () and material returning partition (). The headers () are connected with the headers () formed by some water-cooling tubes of membrane walls by connecting tubes ().

Water-cooling U-valve

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Beijing, China

Qinggang Lu