循环流化床返料装置1维动力学模型

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清华大学辅仁网/2017-07-07

循环流化床返料装置1维动力学模型

冯蘅,李清海,甘超,蒙爱红,张衍国(

)

One-dimensional hydrodynamic model of the recycling valve in a circulating fluidized bed

Heng FENG,Qinghai LI,Chao GAN,Aihong MENG,Yanguo ZHANG(

)

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory for CO₂Utilization and Reduction Technology, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China

摘要:

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文章导读

摘要为研究物料循环流率和通气量等因素对返料装置立管中料柱高度的影响,该文依据Loop-seal气动阀门和立管内气固流动特性,建立了1维动力学模型。模型的计算值与实验结果基本吻合。在一定范围内,随着物料循环流率的增大,返料装置通过分配进入立管和排料室的通气量,增加料柱高度,实现回路的压力平衡。若物料循环流率超过临界值,返料装置将失去自适应能力,物料会溢出立管并进入分离器,破坏系统的稳定运行。适当增大通气量,可增强返料装置的自适应性,并扩大稳定运行的范围。该模型为立管高度较低的循环流化床返料装置的设计和优化提供了参考。

关键词 ：循环流化床,返料装置,1维动力学模型,立管料柱高度

Abstract：This study focuses on the influence of key factors, such as solids circulation rate and the aeration rate, on the solids height in the standpipe of the recycling valve. A one-dimensional hydrodynamic model is developed based on the hydrodynamics of the gas-solid flow in the loop-seal and the standpipe. The predicted heights agree well with experimental data. Redistribution of the aeration ratio in the standpipe and the discharge chamber increases the solids height in the standpipe to adapt to increasing solids circulation rates and to balance the pressures in the circuit. The results also indicate that if the solids circulation rate is over a critical value, the recycling valve will lose its self-adaptability and the solids will rise out of the standpipe and into the cyclone separator. The self-adaptability can be enhanced and the stable operation range of the recycling valve can be extended by properly increasing the aeration rate. This model is useful for the design and optimization of circulating fluidized bed recycling valves with relatively short standpipes.

Key words：circulating fluidized bed recycling valve one-dimensional hydrodynamic model standpipe solids height

收稿日期: 2013-05-23 出版日期: 2015-04-16

ZTFLH:

基金资助:国家 “九七三” 重点基础研究项目 (2011CB201502);国家“十二五”科技支撑计划项目(2010BAC66B03)

引用本文:

冯蘅, 李清海, 甘超, 蒙爱红, 张衍国. 循环流化床返料装置1维动力学模型[J]. 清华大学学报（自然科学版）, 2014, 54(2): 229-234.
Heng FENG, Qinghai LI, Chao GAN, Aihong MENG, Yanguo ZHANG. One-dimensional hydrodynamic model of the recycling valve in a circulating fluidized bed. Journal of Tsinghua University(Science and Technology), 2014, 54(2): 229-234.

链接本文:

http://jst.tsinghuajournals.com/CN/或 http://jst.tsinghuajournals.com/CN/Y2014/V54/I2/229

图表:

CFB物料循环示意图

返料装置的经验关联式及动力学模型

立管中料柱薄层受力分析

供料室、孔口、排料室气固流动示意图

D_s	D_r	L_s	A_o	Z_r
80	80	4×10³	40×40	300

返料装置参数mm

物料参数	d_p/μm	ρ_p/(t·m^-3)	ε_mf	ε₀	ϕ₀/(^o)
石英砂I	78	3.12	0.510	0.479	33.3
石英砂II	101	3.12	0.476	0.466	38.6
石英砂III	157	3.12	0.461	0.452	43.9
FCC颗粒	65	1.72	0.494	0.490	—

物料参数

运行参数	Loop-seal压降/kPa	料柱高度L_s/m
实验数据	1.00 (Kim等^[10] )	0.50(Basu等^[9])
模型计算值	0.98	0.46

Loop-seal压降及料柱高度的模型计算值与实验数据比较

在不同外部压ΔP₃₀差下料柱高度L_s随排料速率G_p变化(d_s= 78 μm)

返料装置各部件相对通气量Q/(A·U_mf )随物料循环流率G_s变化(d_p=78 μm, L_s=1.0 m)

料柱高度L_s随供料室相对通气量Q₁/(A·U_mf )变化规律

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