Experimental Research of Voidage of Pressurized Dense-Phase Pneumatic Conveying

Abstract

Abstract:

Abstract： Experiments on the conveying characteristics of Inner Mongolia bituminous coal powder were conducted on a pilotscale pressurized pneumatic conveying test rig. Effects of operational conditions and material properties on the voidage ε were explored respectively. The results indicate that increasing the conveying pressure p is beneficial for conveying at a lower ε. ε initially drops and then grows with the rise in the flow rate of fluidizing gas Qf. Increase of supplemental gas Qsp leads to a higher ε. With the increase of total differential pressure Δp, ε of 52 μm coal decreases at first and then increases marginally, whereas the voidages in the riser section εr of 115 μm and 300 μm coal both rise continually. εr of pulverized coal with larger particle size exhibits a lower voidage at the same Δp. Increase of the moisture content M of coal results in a lower volumetric flow rate of solids and a higher volidage of the two phase flow. With the decrease of superficial gas velocity Vg, the flow regime of 300 μm coal changes from suspended flow to slug flow, while the volidge in the pipeline εp declines gradually.

Key words: pressurized pneumatic conveying, dense phase, voidage

CLC Number:

TQ 51

LU Peng1,PU Wenhao1,CHEN Xiaoping2,ZHAO Changsui2. Experimental Research of Voidage of Pressurized Dense-Phase Pneumatic Conveying[J]. Journal of Shanghai Jiaotong University, 2014, 48(11): 1595-1599.

References

［1］徐越, 吴一宁, 危师让. 二段式干煤粉气流床气化技术的模拟研究与分析［J］.中国电机工程学报, 2003，23(10): 186190.

XU Yue, WU Yining, WEI Shirang. Simulation and analysis on gasification technology of a twostage dry feed entrained flow bed［J］. Proceedings of the Chinese Society of Electrical Engineering, 2003, 23 (10): 186190.

［2］王辅臣.大规模高效气流床煤气化技术基础研究进展［J］. 中国基础科学，2008，13(3): 413.

WANG Fuchen. Progress on the largescale and highefficiency entrained flow coal gasification technology［J］. China Basic Science, 2008, 13(3): 413.

［3］Yan F, Rinoshika A. Application of highspeed PIV and image processing to measuring particle velocity and concentration in a horizontal pneumatic conveying with dune model［J］. Powder Technology, 2011, 208(1): 158165.

［4］Sakai M, Koshizuka S. Largescale discrete element modeling in pneumatic conveying［J］. Chemical Engineer Science, 2009, 64(3): 533539.

［5］Pahk J B, Klinzing G E. Comparison of flow characteristics for dilute phase pneumatic conveying for two different plastic pellets［J］. Journal of the Chinese Institute of Chemical Engineers, 2008, 39(2): 143150.

［6］董卫宾, 郭晓镭, 龚欣,等. 上出料系统粉煤密相气力输送特性及其与下出料系统的比较［J］.化工学报, 2011, 62(7): 19891997.

DONG Weibin, GUO Xiaolei, GONG Xin. et al. Characteristic of top discharge blow tank conveying system and comparison with bottom discharge blow tank conveying system［J］. CIESC Journal, 2011, 62(7): 19891997.

［7］贺春辉, 沈湘林, 胥宇鹏, 等. CO2/N2作输送载气对煤粉高压密相气力输送特性的影响［J］. 中国电机工程学报, 2012, 32(29): 3844.

HE Chunhui, SHEN Xianglin, XU Yupeng, et al. Influences of CO2/N2 as carrier gas on dense phase pneumatic conveying of pulverized coal at high pressure［J］. Proceedings of the Chinese Society of Electrical Engineering, 2012, 32(29): 3844.

［8］LIANG Cai, XU Pan, CHEN Xiaoping, et al. Flow characteristics and stability of densephase pneumatic conveying of pulverized coal under high pressure［J］. Experimental Thermal and Fluid Science, 2012, 41: 149157.

［9］付飞飞, 许传龙, 王式民. 密相气力输送中气固两相流动特性多源信息分析［J］. 化工学报, 2012, 63(10): 30703079.

FU Feifei, XU Chuanlong, WANG Shimin. Multisensors integration for flow characterization of dense phase pneumatic conveying of coal powder［J］. CIESC Journal, 2012, 63(10): 30703079.

［10］沈湘林, 熊源泉. 煤粉加压密相输送实验研究［J］. 中国电机工程学报, 2005, 25(24): 103107.

SHEN Xianglin, XIONG Yuanquan. Experimental study on densephase pneumatic conveying of pulverized coal at high pressures［J］. Proceedings of the Chinese Society of Electrical Engineering, 2005, 25(24): 103107.

［11］Geldart D, Ling S J. Dense phase conveying of fine coal at high total pressure［J］. Powder Technology, 1990, 62(3): 243252.

［12］鹿鹏，陈晓平，梁财，等．不同煤粉高压密相气力输送特性试验研究［J］．中国电机工程学报，2009，29（5）：1620.

LU Peng, CHEN Xiaoping, LIANG Cai, et al. Experimental study on the characteristics of highpressure and densephase pneumatic conveying of different pulverized coal［J］. Proceedings of the Chinese Society of Electrical Engineering, 2009, 29（5）： 1620.

［13］Fisher R A. On the capillary forces in an ideal soil; correction of formulae given by W B Haines［J］. The Journal of Agricultural Science, 1926, 16(3): 492505.

［14］陆厚根. 粉体技术导论［M］. 上海: 同济大学出版社, 1998.

[1]	YANG Zhen,FU Zhuang,GUAN Enguang,XU Jiannan,TIAN Shihe,ZHENG Hui. The Kinematic Analysis and Structure Optimization of MLattice Modular Robot [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1153-1159.
[2]	ZHAO Jun1,YU Haidong2. Dynamic Analysis of TwoLink Flexible Manipulators Based on the Absolute Nodal Coordinate Formulation [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1160-1165.
[3]	ZHAO Ziren1,DU Shichang1,HUANG Delin1,REN Fei2,LIANG Xinguang2. Modelling and Bottleneck Analysis of Product Quality in Transient Phase of MultiStage Manufacturing Systems Based on Markovian Chains [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1166-1173.
[4]	HUANG Xuangui. Algorithm for Relatively Small Planted Clique with Small Edge Probability [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1202-1206.
[5]	LUO Jingjinga,YU Haidonga,ZHAO Chunzhanga,b,WANG Haoa,b. Study on Motion Stability of Variable CrossSection Flexible Beams Based on the Absolute Nodal Coordinate Formulation [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1174-1180.
[6]	WANG Yibo1,HUANG Yixiang1,LI Bingchu1,LING Xiao1 ZHAO Shuai1,LIU Chengliang1,ZHANG Daqing2. An Improved Modal Simulation Method for Switched Reluctance Motor Based on Static PreComputation [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1181-1188.
[7]	ZHOU Binghai,LI Ming. Scheduling Method of Manufacturing Cells with Robot Restricted Processing [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1214-1219.
[8]	CHEN Jinping1,ZHANG Shusheng1,HE Weiping1,WANG Mingwei1,HUANG Hui2. Feasible Change Path Search and Optimization Method Based on Driving Parameter Modeling [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1220-1227.
[9]	ZHOU Penghui,MA Hongzhan,CHEN Dongping,CHEN Mengyue,CHU Xuening. Identification of Product Redesign Modules Based on Fuzzy Random Failure Mode and Effects Analysis [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1189-1195.
[10]	PENG Cheng,ZHU Jianyun,CHEN Li. Mode Transition for a Hybrid Electric Vehicle Based on Model Reference Control [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1196-1201.
[11]	LIU Wei,YANG Chao . A Study on Injection Mould Part Quotation Model Based on Back Propagation Neural Network [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1207-1213.
[12]	CHEN Suting，WANG Zhuo，WANG Qi. Aerial Scene Classification Based on Nonlinear Scale Space [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1228-1234.
[13]	CHEN Ning,HE Xiaobin,GUI Weihua,YANG Chunhua. Research on Image Encryption System Based on Chaotic Discrete Sequence [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1273-1280.
[14]	LIU Kaia，ZHANG Liminb，ZHOU Lijuna. Design of Random Restricted Boltzmann Machine Group [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1235-1240.
[15]	ZHU Xinyao1，SONG Baowei2,XU Gang1,YANG Songlin1. Research on Landing Strategy and Influencing Factors of an Autonomous Underwater Vehicle with Supporting Mechanism [J]. Journal of Shanghai Jiaotong University, 2017, 51(10): 1241-1251.