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| 1 | 气固流化床中声发射和流动模式关系显示文摘The flow pattern of a fluidized bed is a key factor for heat transfer and new reactor design.The flow pattern of the gas-solid fluidized bed was experimentally measured by a novel acoustic emission(AE)technique.The acoustic energy generated by the collision of solids particles on the reactor wall or in the local space is a reflection of the speed and frequency of collision,and consequently the flow pattern of particles.The flow pattern of polyethylene particles with the average size 460 μm in a 150 mm fluidized bed in the range of superficial gas velocity from 0.3 m·s-1 to 0.7 m·s-1 was multi-circulation pattern with main-circulation zone,sub-circulation zone and stagnant zone.The multi-circulation flow pattern would transit to the single circulation flow pattern if superficial gas velocity exceeded 0.8 m·s-1 or average particle size decreased to below 365 μm.The height of stagnant zone remained unchanged with the increase of static bed height.It was also found that the type of the distributor had an evident effect on flow pattern.The single circulation flow pattern in the fluidized bed with a perforated stainless steel plate distributor would change to the multi-circulation flow pattern for the same particles and the same fluidized bed with a cone-shaped distributor.An empirical equation calculating the height of stagnant zone was presented and the experimental data could be correlated with the empirical equation with fairly good accuracy. | 王靖岱 曹翌佳 任聪静 阳永荣 侯琳熙 | 2007 | 化工学报2007，58，7： | 11 |
| 2 | 从噪声到信息——声发射技术在流程工业中的应用显示文摘回顾了声发射检测技术在流程工业多相系统中的应用,简要介绍了声发射技术的基本原理、数据流程及设备组成,阐述了声发射技术中采样频率与设备灵活性相互制约以及数据回归等问题。研究了声发射技术在催化剂自动加料控制(气-固体系)、流化床冷凝态露点控制(气-液体系)中的应用。说明了该项技术在液态系统中有着更为广阔的发展前景,与其它技术相比,声发射技术具有便捷、实时、准确、环保等优点。 | 曹翌佳 刘伟 姜晓静 王靖岱 阳永荣 | 2007 | 化工进展2007，26，12： | 9 |
| 3 | 声发射技术在化工过程中的应用显示文摘在简要介绍声发射技术原理、测量手段与分析分析方法的基础上,系统回顾了被动声发射技术在化工过程中对于物理化学变化以及设备状态监控的广泛应用,对声发射技术在流程工业中各个单元操作以及设备监控等各个方面的应用进行了综述。总结表明,声发射技术适用于各种恶劣的工业环境,能够实时在线、准确地实现流程工业中关键过程参数的检测,具有广阔的工业应用前景;相比于传统的检测手段,声发射技术具有更为广阔的工业应用前景。 | 任聪静 陈敏 曹翌佳 黄正梁 王靖岱 阳永荣 | 2011 | 化工进展2011，30，5： | 7 |
| 4 | 声信号多尺度解析与催化剂结焦的检测显示文摘基于声波检测技术,结合频谱分析及小波分析方法,实现了催化剂结焦的在线检测。通过150mm冷模流化床实验发现,常温下以空气为流化气体时,FCC新鲜催化剂和结焦催化剂颗粒撞击流化床壁面产生的声信号频谱具有明显的差异。进一步分析两种信号十尺度小波分解后的能量分率发现,两者在特征频段上同样存在差异,说明声信号多尺度方法能够清晰指示催化剂的结焦,有效地监控催化剂的结焦过程。由此获得了一种实时在线、非侵入式的催化剂结焦检测手段。 | 虞贤波 刘烨 王靖岱 阳永荣 谢在库 | 2008 | 石油学报(石油加工)2008，24，5： | 3 |
| 5 | Determination of particle size distribution by multi-scale analysis of acoustic emission signals in gas-solid fluidized bed显示文摘Particle size distribution(PSD) is an important parameter in the process of fluidization,and it always plays a crucial role in a gas-solid fluidized system.A PSD model for on-line PSD determination based on acoustic emission(AE) measurement was developed according to the mechanism of particle collision with the inner wall of the cylinder and multi-scale wavelet decomposition analysis.This PSD model illuminates the quantitative relationship between the energy percentage of AE signals for different scales and the PSD,which indicates the feasibility of the application of the PSD model.Experiments were undertaken both in lab and plant gas-solid fluidized setup with polyethylene particles,and the parameters of the PSD model were calibrated and revised.The experimental conditions and results proved that the PSD model was suitable for on-line measurement and was sufficiently sensible and accurate.Concerning agglomeration,the PSD model also showed exact serviceability on detecting the onset of agglomeration by abnormal PSD,and the result agreed with that from the radiation method.Ultimately,AE measurement was found to be a reliable and credible means for understanding the PSD information that affects the behavior of a system,which can provide valuable guidance for practical applications. | Cong-jing REN Jing-dai WANG Di SONG Bin-bo JIANG Zu-wei LIAO Yong-rong YANG | 2011 | Journal of Zhejiang University-Science A(Applied Physics & Engineering)2011，12，4： | 3 |
| 6 | 颗粒与分布板的碰撞声信号分析及其流化状态的识别显示文摘Acoustic signals emitted from particles and bubbles in the gas-solid fluidized bed were collected by the transducer located under the distributor and the result showed that the energy and deviation of acoustic signals varied regularly with superficial velocity.Superficial velocity was the minimum fluidizing velocity or the minimum turbulent velocity, while energy or deviation changed suddenly.Then a criterion to determine the change of flow pattern was obtained that when the ratio of acoustic energy or deviation reached the maximum, the velocity was the minimum fluidizing velocity, while the ratio of acoustic energy or deviation reached the next maximum the corresponding velocity was the minimum turbulent velocity.Experiments were carried out in a fluidized bed with inner diameter of 250 mm and polyethylene resin particles.The minimum fluidizing and minimum turbulent velocity obtained from the new method agreed well with those deducted from classical equations and traditional methods, including pressure difference method and pressure fluctuation method.In conclusion, an easy, sensitive, exact and on-line way to detect fluidizing velocity is presented, and this method is applicable to industrial equipment. | 任聪静 王靖岱 阳永荣 蒋斌波 | 2008 | 化工学报2008，59，4： | 2 |
| 7 | 乙烯气相聚合工艺研究与技术进展显示文摘聚乙烯已成为全球产量最大、用途最广的合成材料。由于生产流程短和设备投资低的优势,流化床气相聚合工艺是聚乙烯的主要生产路线,得到了广泛而深入的研究和开发。本文综述了国内外乙烯气相聚合工艺技术的研发历程,特别是中国在气相法聚乙烯技术方面做出的重要贡献。总结了气相聚合工艺的七种操作模式,即干法气相聚合、超干法气相聚合、气相冷凝聚合、气相超冷凝聚合、气液固云雾聚合、露点聚合以及交替交变聚合。分析了各操作模式所涉及的关键科学问题和工程技术解决方案,例如反应器时空产率模型、冷凝态聚合操作点优化、溶剂的作用、黏性流化颗粒熔融温度预测、流化质量监控与声发射、多流型复合以及一器多用等,并重点介绍了气-液-固云雾聚合流化床反应器中颗粒团聚、气泡运动的新特征,云雾聚合流化床运行的新稳定机制,以及实现聚合物产品结构调控的新途径——乙烯的露点聚合和交替交变聚合技术。指出聚合反应工程学科正从聚焦传统的过程强化,发展到过程强化与产品多样化相互兼顾的变化趋势。 | 阳永荣 王靖岱 | 2021 | 化学反应工程与工艺2021，37，1： | 1 |
| 8 | Nonlinear characteristics analyses of particle motion for predicting flow regimes显示文摘Gas-solid flow regimes have a significant impact on particle transport and separation in a fluidized bed reactor.In this study,to determine flow regime transitions in gas-solid fluidized beds,an acoustic technique was used to detect and analyze the behavior of gas and solids.Algorithm complexity,fluctuation complexity,and Shannon entropy analyses of acoustic emission signals were performed to examine non linear system characteristics,and to determine the flow regime transiti on velocities uc,uk,and ufd-Moreover,using the standard deviation of pressure signals,pressure measurements and acoustic measurements were compared.The relative deviations(RDs)between the experimental and empirical values of uk were 8.8%,13.7%,8.8%,and 30.4%for the algorithm complexity,fluctuation complexity,Shannon entropy,and pressure signal standard deviation,respectively,while the respective RDs for Ufd were 15.7%,23.9%,15.7%,and 97.8%.The RDs between the experimental and empirical values of uc were all 6.4%.The experimental values obtained from acoustic signal measurements were therefore closer to the empirical values.In summary,the integration of non-intrusive acoustic measurements,complexity analysis,and Shannon entropy analysis is suitable for identifying flow regime transitions. | Panxing Kang Yujian Lu Lei Yang Libin Liu Xiayi(Eric)Hu Xiao Luo Hongbo Chen Yefeng Zhou Rui Zhang | 2020 | Particuology2020，18，6： | 1 |
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