Chinese Academy of Sciences

Shaolin Bao

Ming Gao

Shiyuan Li

Dongyu Wang

Qinggang Lv

Yunkai Sun

Yongjie Na

Wei Li

Haoyu Li

Jianguo Zhu

Guoliang Song

Qinggang Lu

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 circulating fluidized bed boiler is disclosed. The circulating fluidized bed boiler comprising: a furnace defined and enclosed by water walls, a ceiling and an air distributor, the water walls comprising front and rear walls and left and right side walls (AJ, TK) formed by water cooling tubes, and the water walls are provided with secondary air ports (Y) in the lower part thereof, and furnace flue gas outlets (AB, EF, IJ, KL, OP, ST) being provided in an upper part of the furnace; at least two cyclones connected with the furnace flue gas outlets (AB, EF, IJ, KL, OP, ST); a loop-seal is connected with solid outlets of the cyclones and the lower part of the furnace, respectively; and a flue gas duct connected with flue gas outlets of the cyclones wherein the water cooling wall tubes of the water wall form at least one vertical columnar recessed segment (BCDE, FGHI, SRQP, ONML) recessed toward the inside of the furnace, and the at least one columnar recessed segment (BCDE, SRQP, ONML) extends at least 15% of the furnace height in a vertical direction.

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

Shaolin Bao