Numerical simulation of the impact of secondary air for a pant-leg 300 MW circulation fluidized bed boiler

被引：0
|
作者：
Zheng C.-H. [1 ]
Cheng L.-M. [1 ]
Luo Z.-Y. [1 ]
Wang Q.-H. [1 ]
Shi Z.-L. [1 ]
Cen K.-F. [1 ]
机构：
[1] State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University
来源：
Zhejiang Daxue Xuebao(Gongxue Ban)/Journal of Zhejiang University (Engineering Science) | 2010年 / 44卷 / 04期
关键词：
Circulation fluidized bed boiler; Penetrability; Secondary air;
D O I：
10.3785/j.issn.1008-973X.2010.04.021
中图分类号：
学科分类号：
摘要：
Secondary air plays very important role in combustion for oxygen supplement and NOx control in a circulation fluidized bed (CFB) furnace. However the distribution of secondary air in the furnace becomes worse as the furnace is enlarged. Numerical simulation was performed to study the impacts of secondary air in the furnace of a pant-leg 300 MW CFB boiler. The flow fields of solids velocity and concentration were computed at different secondary air injecting velocity and direction using Fluent6.2. The distributions of solids velocity and concentration were given and analyzed at different location and cross-section in the furnace. The penetrability of secondary air was also analyzed. The simulation shows that the solids flow goes down in the middle of the furnace, and the distribution of solids concentration in the Z cross-section is uneven, which is similar to a combination of several core-annular flows. The solids concentration in the top of furnace is higher with the one. The secondary air can optimize the gas and solids flow fields in the furnace. The penetration of outboard secondary air injection is better than that of the inboard one. The simulation results can be referenced in the design and operation for a large CFB boiler.
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页码：743 / 749
页数：6
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