Chinese Academy of Sciences

Yongjie Na

Ming Gao

Shiyuan Li

Dongyu Wang

Yunkai Sun

Shaolin Bao

Qinggang Lu

Wei Li

Haigang Wang

Haoyu Li

Xiaofang Wang

Jianguo Zhu

Qinggang Lv

Guoliang Song

Jingzhang Liu

Qiangqiang Ren

The present disclosure provides a method for distributing gas for oxy-fuel combustion on a circulating fluidized bed. In the method, the gas is provided by three stages into a furnace of the circulating fluidized bed. The method includes: blowing in a first-stage gas containing oxygen and recycled flue gas from the bottom of the furnace; blowing in a second-stage gas containing recycled flue gas from a transition zone between a dense-phase zone and a dilute-phase zone of the furnace; and blowing in a third-stage gas containing oxygen from a side wall of the furnace.

Method for distributing gas for oxy-fuel combustion in circulating fluidized bed

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

Yongjie Na