[1]梁财,陈晓平,蒲文灏,等.高压浓相煤粉气力输送差压信号多分辨分析[J].东南大学学报(自然科学版),2006,36(6):967-971.[doi:10.3969/j.issn.1001-0505.2006.06.019]
 Liang Cai,Chen Xiaoping,Pu Wenhao,et al.Application of multi-resolution analysis to differential pressure in dense-phase pneumatic conveying of pulverized coal under high pressure[J].Journal of Southeast University (Natural Science Edition),2006,36(6):967-971.[doi:10.3969/j.issn.1001-0505.2006.06.019]
点击复制

高压浓相煤粉气力输送差压信号多分辨分析()
分享到:

《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
36
期数:
2006年第6期
页码:
967-971
栏目:
化学化工
出版日期:
2006-11-20

文章信息/Info

Title:
Application of multi-resolution analysis to differential pressure in dense-phase pneumatic conveying of pulverized coal under high pressure
作者:
梁财 陈晓平 蒲文灏 范春雷 鹿鹏 赵长遂
东南大学洁净煤发电及燃烧技术教育部重点实验室, 南京 210096
Author(s):
Liang Cai Chen Xiaoping Pu Wenhao Fan Chunlei Lu Peng Zhao Changsui
Key Laboratory of Clean Coal Power Generation and Combustion Technology of Ministry of Education, Southeast University, Nanjing 210096, China
关键词:
气力输送 表观速度 小波多分辨分析 能量 Shannon熵 标准差
Keywords:
pneumatic conveying superficial velocity wavelet multi-resolution analysis energy Shannon entropy standard deviation
分类号:
TQ022
DOI:
10.3969/j.issn.1001-0505.2006.06.019
摘要:
为了探究高压浓相气力输送过程中时频空间的内部特征,利用六尺度多分辨小波分析对试验差压信号进行时频分解.引进能量、Shannon熵和标准差STD作为特征量对气固两相流频域空间进行分析.分析表明:浓相气力输送过程中,差压信号中的能量主要分布在低频区, Shannon熵从高频到低频上呈先减小后增大分布趋势.在相同的试验压力条件下,随着表观速度的增大,低频所占据的能量份额减小,信号脉动向高频移动; 高频d11和d22的Shannon熵和a6上的STD增大,低频d4~d646上的Shannon熵和d1~d616上的STD减小.为进一步研究流型辨识及流动稳定性提供了新方法.
Abstract:
In order to reveal intrinsic features of dense-phase pneumatic conveying in both time and frequency spaces, six scales wavelet multi-resolution analysis was employed to analyze experimental data of differential pressure. Energy, Shannon entropy and standard deviation were applied to characterize gas-solid two-phase flow in frequency space. The results show that energy of differential pressure signal mainly distributes in the low frequency region and Shannon entropy has the minimum value in the middle frequency region in the dense-phase gas-solid pneumatic conveying. Under same pressure, as the superficial velocity increases, the energy quotient in the low frequency region decreases, the signal fluctuation shifts to the high frequency region, the Shannon entropy in the high frequency space d11 and d2 and standard deviation(STD)of a6 increase, and the Shannon entropy in the low frequency space from d4 to d6 and the STD in the entire frequency region from d11 to d6 decrease. The research provides a new approach for identifying regime and stability of the gas-solid two-phase flow.

参考文献/References:

[1] Laouar S,Molodtsof Y.Experimental characterization of the pressure drop in dense phase pneumatic transport at very low velocity[J].Powder Technology,1998,95(2):165-173.
[2] Jama G A,Klinzing G E,Rizk F.Investigation of the prevailing flow patterns and pressure fluctuation near the pressure minimum and unstable conveying zone of pneumatic transport systems[J].Powder Technology,2000,112(1):87-93.
[3] Wypych P W,Yi J.Minimum transport boundary for horizontal dense-phase pneumatic conveying of granular materials[J]. Powder Technology,2003,129(1-3):111-121.
[4] Ellis N,Briens L A,Grace J R,et al.Characterization of dynamic behaviour in gas-solid turbulent fluidized bed using chaos and wavelet analyses[J]. Chemical Engineering Journal,2003,96(1-3):105-116.
[5] Herbreteau C,Bouard R.Experimental study of parameters which influence the energy minimum in horizontal gas-solid conveying[J].Powder Technology,2000,112(3):213-220.
[6] Bai D,Shibuya E,Nakagawa N,et al.Characterization of gas fluidization regimes using pressure fluctua-tions[J].Powder Technology,1996,87(2):105-111.
[7] Li J,Kuipers J A M.Gas-particle interactions in dense gas-fluidized beds[J].Chemical Engineering Science,2003,58(3-6):711-718.
[8] Li H.Application of wavelet multi-resolution analysis to pressure fluctuations of gas-solid two-phase flow in a horizontal pipe[J]. Powder Technology,2002,125(1):61-73.
[9] Lu Xuesong,Li Hongzhong.Wavelet analysis of pressure fluctuation signals in a bubbling fluidized bed[J].Chemical Engineering Journal,1999,75(2):113-119.
[10] 陈珙,王保良,杨江,等.小波变换识别流型的一种新法研究[J].仪器仪表学报,1999,20(2):117-120.
  Chen Gong,Wang Baoliang,Yang Jiang,et al.Flow regimes identification in horizontal pipe using wavelet transform[J]. Chinese Journal of Scientific Instrument,1999,20(2):117-120.(in Chinese)
[11] Li H,Tomita Y.Particle velocity and concentration characteristics in a horizontal dilute swirling flow pneumatic conveying [J]. Powder Technology, 2000,107(1,2):144-152.
[12] Zhong Wenqi,Zhang Mingyao.Pressure fluctuation frequency characteristics in a spout-fluid bed by modern ARM power spectrum analysis[J].Powder Technology,2005,152(3):52-61.
[13] Dhodapkar S,Klinzing G E.Pressure fluctuations in pneumatic conveying systems [J].Powder Technology,1993,74(2):179-195.
[14] Dhodapkar S V,Klinzing G E.Pressure fluctuations in pneumatic conveying systems[J].National Conference Publication-Institution of Engine,1992,1(92):29-34.
[15] 赵贵兵,李天铎,阳永荣,等.气固两相流压力波动信号分析[J].中国粉体技术,2001,7(3):6-10.
  Zhao Guibing,Li Tianduo,Yang Rongrong,et al.Analysis components of pressure fluctuation in gas solid fluidized bed[J].China Powder Science and Technology,2001,7(3):6-10.(in Chinese)

相似文献/References:

[1]范春雷,陈晓平,梁财,等.煤粉高压密相气力输送特性[J].东南大学学报(自然科学版),2007,37(3):432.[doi:10.3969/j.issn.1001-0505.2007.03.016]
 Fan Chunlei,Chen Xiaoping,Liang Cai,et al.Investigation on characteristics of pulverized coal dense-phase pneumatic conveying under high pressure[J].Journal of Southeast University (Natural Science Edition),2007,37(6):432.[doi:10.3969/j.issn.1001-0505.2007.03.016]
[2]蔡海峰,熊源泉,周海军.水平弯管高压密相气力输送数值模拟[J].东南大学学报(自然科学版),2019,49(1):154.[doi:10.3969/j.issn.1001-0505.2019.01.022]
 Cai Haifeng,Xiong Yuanquan,Zhou Haijun.Numerical simulation on dense phase pneumatic conveying under high pressure in horizontal bend[J].Journal of Southeast University (Natural Science Edition),2019,49(6):154.[doi:10.3969/j.issn.1001-0505.2019.01.022]
[3]周海军,熊源泉.曳力模型对水平管高压密相气力输送模拟的影响[J].东南大学学报(自然科学版),2020,50(3):496.[doi:10.3969/j.issn.1001-0505.2020.03.012]
 Zhou Haijun,Xiong Yuanquan.Effect of drag models on simulation of dense-phase pneumatic conveying in horizontal pipe under high pressure[J].Journal of Southeast University (Natural Science Edition),2020,50(6):496.[doi:10.3969/j.issn.1001-0505.2020.03.012]

备注/Memo

备注/Memo:
基金项目: 国家重点基础研究发展计划(973计划)资助项目(2004CB217702-01)、东南大学优秀博士学位论文基金资助项目.
作者简介: 梁财(1980—),男,博士生; 赵长遂(联系人),男,教授,博士生导师,cszhao@seu.edu.cn.
更新日期/Last Update: 2006-11-20