Minimum pressure drop velocity and stability analysis in pneumatic conveying of pulverized coal in commercial-scale horizontal pipe

doi:10.3969/j.issn.0438-1157.2013.06.010

CIESC Journal ›› 2013, Vol. 64 ›› Issue (6): 1969-1975.DOI: 10.3969/j.issn.0438-1157.2013.06.010

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Minimum pressure drop velocity and stability analysis in pneumatic conveying of pulverized coal in commercial-scale horizontal pipe

XIE Kai, GUO Xiaolei, CONG Xingliang, LIU Kai, TAO Shunlong, LU Haifeng, GONG Xin

Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Received:2012-09-18 Revised:2013-01-09 Online:2013-06-05 Published:2013-06-05
Supported by:
supported by the National Basic Research Program of China(2010CB227002),the"Chen Guang" Project of Shanghai Municipal Education Commission and Shanghai Education Development Foundation and the National Natural Science Foundation of China(21206041).

工业级水平管粉煤气力输送的最小压降速度和稳定性

谢锴, 郭晓镭, 丛星亮, 刘剀, 陶顺龙, 陆海峰, 龚欣

华东理工大学煤气化及能源化工教育部重点实验室,上海 200237

通讯作者: 龚欣
作者简介:谢锴(1988—),男,硕士研究生。
基金资助:
国家重点基础研究发展计划项目(2010CB227002);上海市教育委员会和上海市教育发展基金会"晨光计划";国家自然科学基金项目(21206041)。

Abstract

Abstract: Dense-phase pneumatic conveying of pulverized coal was investigated in an commercial-scale horizontal pipe (50 mm I.D.) by using compressed air as carrier gas.Minimum pressure drop velocity was obtained from the Zenz-type phase diagram, which was influenced by solids mass flux significantly.Based on electrical capacitance tomography (ECT) system, the flow in the experimental range was classified into four regimes:stratified flow, dune flow, moving bed flow and slug flow.Using probability density function (PDF) and power spectral density (PSD) function to analyze the pressure signals of typical cases, pressure fluctuations were well correlated with flow patterns.The relative stability characteristics of different operating conditions showed that the critical velocity between stable and unstable conveying was smaller than minimum pressure drop velocity due to the transitions of flow patterns.

Key words: dense-phase pneumatic conveying, minimum pressure drop velocity, flow pattern, stability

摘要： 采用压缩空气作为输送介质,在工业级水平管(内径50 mm)上开展了粉煤密相气力输送实验研究。在实验获得最小压降速度基础上,通过电容层析成像系统观察到,随着表观气速降低而存在分层流、沙丘流、移动床流以及栓塞流4种流型。不同流型压力信号的概率密度分布和功率谱密度分析表明,压力信号的波动特征与流型紧密联系;由于流动形态的变化,存在由稳定输送过渡到不稳定输送的临界气速,且该速度小于最小压降速度。

关键词: 密相气力输送, 最小压降速度, 流型, 稳定性

CLC Number:

TQ536

XIE Kai, GUO Xiaolei, CONG Xingliang, LIU Kai, TAO Shunlong, LU Haifeng, GONG Xin. Minimum pressure drop velocity and stability analysis in pneumatic conveying of pulverized coal in commercial-scale horizontal pipe[J]. CIESC Journal, 2013, 64(6): 1969-1975.

谢锴, 郭晓镭, 丛星亮, 刘剀, 陶顺龙, 陆海峰, 龚欣. 工业级水平管粉煤气力输送的最小压降速度和稳定性[J]. 化工学报, 2013, 64(6): 1969-1975.

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Minimum pressure drop velocity and stability analysis in pneumatic conveying of pulverized coal in commercial-scale horizontal pipe

工业级水平管粉煤气力输送的最小压降速度和稳定性

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