期刊
ADVANCED POWDER TECHNOLOGY
卷 25, 期 3, 页码 1155-1161出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apt.2014.02.021
关键词
Circulating fluidized bed; Non-mechanical valve; Solid circulation rate; Stagnant particle layer; N-valve with side aeration
资金
- National Key Technology Development Program of China [2009BAC641305, 2011CB201304]
- National High-Tech Research and Development Program of China [2009AA02Z209]
- National Nature Science Foundation of China [21006110]
The existence of stagnant particle layer in the conventional non-mechanical valves limits their utilization in CFB with the feedstock of caking particles. A new N-valve consisted of a fluidized weir chamber with bottom aeration and a moving-bed angled standpipe with side aeration was developed to eliminate the stagnant particle layer and reach high solids circulation rate G(s) in CFBs. The particle flow behavior and its control in the N-valve were studied experimentally. By combining the bottom aeration for weir chamber and the side aeration for angled standpipe the G(s) over 270 kg/(m(2) s) was achieved, and the stagnant particle layer completely disappeared. The G(s) increased with increasing the side aeration gas flow rate Q(sa), and this loosing gas flow was optimally injected from the bend between the downcomer and the angled standpipe. At a constant but enough high Q(sa), the increase in the bottom aeration gas flow rate Q(ba) elevated G(s) linearly. (C) 2014 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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