旋风分离器的入口烟道布置对性能的影响.pdf
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1、2917 Vol.29 No.17 Jun. 15, 2009 2009615 Proceedings of the CSEE 2009 Chin.Soc.for Elec.Eng. 1 0258-8013 (2009) 17-0001-07 TK 223 A470 20 12222 (1 100049 2 100190) Influence of Inlet Duct Layouts on Cyclone Performance LI Zhan-guo1, LIU Zhi-cheng2, HE Jun2, NA Yong-jie2, L Qing-gang2 (1. Graduate Uni
2、versity of Chinese Academy of Sciences, Haidian District, Beijing 100049, China; 2. Institute of Engineering Thermophysics, Chinese Academy of Sciences, Haidian District, Beijing 100190, China ) ABSTRACT: It is common in a large capacity circulating fluidized bed (CFB) boiler to adopt several cyclon
3、es in parallel to the furnace. The lengths of the inlet ducts of the cyclones are very short due to CFB boilers design. Different inlet ducts layouts affect the cyclones performance. Based on cold experiments and numerical simulation, the effects of inlet duct layouts (inner-side and outer-side) on
4、the pressure drop and the separation efficiency of a cyclone with one meter in diameter were investigated. The separation efficiency of the cyclone with an outer-side inlet duct is lower than the one with an inner-side inlet duct, and the pressure drop is also lower. Some particles from the riser ru
5、sh to the vortex finder of the cyclone directly resulting in the reduction of separation efficiency. KEY WORDS: cyclone; inlet duct layout; short inlet duct 1m 2 0 (2006BAA03B02-04) Key Project of the National Eleventh-Five Year Research Programme of China (2006BAA03B02-04). 1-4 5-10 210MW 4 86 ALST
6、OM11600MW 6 800 MW 6 10 Grace12 2 13 Fluent600 MW 6 Yue143 3 15-16 229 Andrzejczyk17Zhao18 ALSTOM 19 1 1.1 1 1Agilent 6 7 1 4 5 2 3 400 1 000 12345 678 1 Fig. 1 Diagram of the experiment system 1 Tab. 1 Main dimensions and parameters of the experiment devices /mm /mm /(m3/h)/(m/s) 4006 000 3 500 15
7、/mm /mm /mm /mm 1 000 8001 800 280 /mm /mm /mm /mm 230350100150 2 (2)2 () (a)(b) 22() Fig. 2 Two different inlet duct layouts (top view) 1.2 3 270m894m 1.3 17 3 20-21 4 t0 t1t2 t2 t3 1001000 0 2 4 6 8 / m 0 20 40 60 80 100 3 Fig. 3 Particle size distribution 1.2 0.8 0.4 0.0 t1t2 t3 t0 M 4 Fig. 4 Sch
8、ematic diagram of inlet solid loading 421t1t2 M2t0 t1t2t3 2 4 = 211032 /() ()/2 ()/2 gg M MWtttttt (1) Mkg/kg Mgkg Wg kg/s /100% 1.4 ( ) 2 3 3 2 2 2.1 2 2 8.38.4m/s2 5 5(8.3 8.4m/s) 2 11.411.6m/s14.614.9m/s 2 Tab. 2 Experiment results /(m/s)/(kg/kg) /kPa /% 0.47 0.34 99.60 0.85 0.36 99.71 1.09 0.33
9、99.83 1.20 0.27 99.82 8.38.4 1.78 0.39 99.70 1.36 0.60 99.69 1.59 0.57 99.72 1.88 0.62 99.72 11.411.6 2.58 0.63 99.83 1.42 0.83 99.82 1.51 0.84 99.77 1.94 0.90 99.80 14.614.9 2.30 0.88 99.78 0.39 0.22 99.16 0.91 0.24 99.02 1.60 0.25 99.07 8.38.4 2.60 0.22 99.25 1.48 0.46 98.89 1.63 0.50 98.98 11.411
10、.6 2.44 0.56 98.72 1.50 0.75 98.86 1.99 0.77 98.41 14.614.9 2.12 0.77 98.33 429 /(kg/kg) 100.0 99.6 99.2 98.4 98.8 0.4 0.8 1.21.6 2.0 2.4 2.8 v 8.38.4 m/s v 8.38.4 m/s 5 Fig. 5 Separation efficiencies under different inlet solid loadings (11.411.6m/s14.614.9m/s) 14.614.9 m/s1.9 2.1 kg/kg 99.8% 98.3%
11、1.5% 2 31.4 1.6 kg/kg2 6 36 (1.41.6kg/kg) 3() Tab. 3 Experiment results (under the same inlet solid loading) /(m/s)/(kg/kg) /kPa /% 11.5 0.6099.69 14.90.8399.828.38.4 15.10.8399.83 8.30.2599.07 8.70.2999.00 11.6 0.4698.89 8.38.4 14.70.7598.86 /(m/s) 100.0 99.6 99.2 98.4 98.8 M 1.41.6 m/s M 1.41.6 m/
12、s 81011 12 13 14 159 6 Fig. 6 Separation efficiencies under different inlet velocities 2.2 78 /(kg/kg) 0.45 0.35 0.25 0.15 v 8.38.4 m/s v 8.38.4 m/s 0.41.2 1.6 2.0 2.4 2.80.8 7 Fig. 7 Pressure drops under different inlet solid loadings /(m/s) 0.9 0.7 0.5 0.3 M 1.41.6 m/s M 1.41.6 m/s 81011 12 14 159
13、13 8 Fig. 8 Pressure drops under different inlet velocities 7(8.3 8.4m/s) 2 11.411.6 m/s14.614.9 m/s 8(1.4 1.6kg/kg) 17 5 3 3.1 Gambit 59 X 0.5 0.0 0.5 0.50.50.0 0 2 4 6 0.5 0.5 0.5 0.5 Y X X 0.50.50.0 0.0 1.5 1.0 0.5 9 Fig. 9 Geometry model and computation grids 3.2 Hoekstra22 232425 (Reynolds Stre
14、ss Model RSM) RSM Fluent (Discrete Phase ModelDPM) 26 DPM() 10%12% 2.5kg/kg 0.12% DPM() SIMPLEC PRESTO! 3.3 Rosin-Rammler(R-R) R-R dYd exp( /) d n Yd dd mdn d330 m n1.998R-R 10 / m R-R 0 400 600 800 2002001 100 80 60 40 20 0 10R-R Fig. 10 Particle size distribution (experimental vs. R-R model) 26 Fl
15、uent 0.60.9 27 0.001 m 0.80.800.854 4 Tab. 4 Comparison of simulated results with experimental data /(kg/kg)/Pa/Pa /Pa /% 2.3880900202.27 1.94900886141.56 1.51840820202.38 1.3683082640.48 |/100% 629 14.8 15.1m/s 3.4 2( 14.7 m/s2.1 kg/kg) Z0.05m11 11 X (a) 0.80.0 0.4 0.4 0.6 0.4 0.2 0.0 0.2 0.4 4.0 2
16、.4 0.9 0.7 2.2 3.8 5.3 6.9 8.4 10.0 Z0.05m X (b) 0.80.0 0.4 0.4 12.0 10.6 9.1 7.7 6.2 4.8 3.3 1.9 0.4 1.0 Z0.05m 0.6 0.4 0.2 0.0 0.2 0.4 0.6 11 Z0.05m Fig. 11 Velocity vectors on the plane Z0.05m 3.5 Z0.05 m12 2 12 X (a) 0.80.0 0.40.4 0.6 0.4 0.2 0.0 0.2 0.4 0.5 8.5 7.5 6.5 4.5 3.5 2.5 1.5 0.5 Z0.05
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- 旋风 分离器 入口 烟道 布置 性能 影响
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