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Influence of internal components on gas-solid flow characteristics in fluidized bed reactor for organic silicon monomer synthesis

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Particuology 2025年第1期96卷 294-311页

作者： Xiaohan Guo Fei Gao Xuehui Xu Jianbo Zhao Yinghou Li Guanghui Chen Pan Zhang Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province College of Chemical EngineeringQingdao University of Science and TechnologyQingdao266042China College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao266043China

Internal components play a crucial role in the synthesis of organic silicon monomer in gas-solid fluidized bed reactors (FBRs). Finger-tube (F-tube) and U-tube components are commonly utilized to control the temperature and ensure its homogeneity in FBRs, thereby guaranteeing a high selectivity of the target product. The main objective of this work is to better understand the influence of F-tube and U-tube on the hydrodynamics in FBRs. Computational fluid dynamics (CFD) combined with the particle image velocimetry (PIV) technique were employed to explore the flow characteristics. The numerical data were validated against the particle velocity using an image processing technique. The results revealed that the F-tube increases the bed voidage by 3.2% and reduces the pressure drop by 13.0%. While the U-tube increases the bed voidage by 2.1% and reduces the pressure drop by 11.2%. These internals improve fluidization by ensuring even particle distribution and enhancing intra-particle circulation compared to reactors without internals.

关键词： Internal components Gas-solid fluidized bed reactors Fluid dynamics Particle image velocimetry system

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One-step preparation of efficient cuprous chloride catalyst for direct synthesis of trimethoxysilane

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Chinese Journal of Chemical engineering 2024年第7期71卷 161-171页

作者： Jiaxin Zhang Lu Wang Zhiqiang Ma Chuanjun Di Guanghui Chen Jipeng Dong Jianlong Li Fei Gao Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China

CuCl-based catalysts are the most commonly used catalysts for the“direct synthesis”of trimethoxysilane(M3).CuCl species are sensitive to air and water,and are prone to oxidation *** CuCl is directly used as a catalyst,it needs to be purified before the utilization,and the operating conditions for the catalyst preparation are relatively harsh,requiring the inert gas *** a high-temperature activation step required for CuCl-based catalysts used for catalyzing synthesis of M3 to form active phase Cu–Si alloys(Cu_(x)Si)with Si powder,in this work,a series of catalysts for the“direct synthesis”of M3 were obtained by a one-step high-temperature activation of the mixture of stable CuCl_(2) precursors,activated carbon-reducing agent,and Si powder,simultaneously achieving the reduction of CuCl_(2) to CuCl and the formation of active phase Cu_(x)Si alloys of CuCl with Si *** prepared samples were characterized through various characterization techniques,and investigated for the catalytic performance for the“direct synthesis”of ***,the operation conditions were optimized,including the activation temperature,catalyst dosage,Si powder particle size,and reaction *** characterization results indicate that during the one-step activation process,the CuCl_(2) precursor is reduced to CuCl,and the resulting CuCl simultaneously reacts with Si powder to form active phases Cu3Si and Cu15Si4 *** optimal catalyst Sacm(250,0.8:10)exhibits a good catalytic activity with selectivity of 95%and yield of 77%for M3,and shows a good universality for various alcohol ***,the catalytic mechanism of the prepared catalyst for the“direct synthesis”of M3 was discussed.

关键词： Trimethoxysilane Cuprous chloride Catalysis Catalyst activation Reduction Active phase formation

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Mass transfer enhancement and hydrodynamic performance with wire mesh coupling solid particles in bubble column reactor

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Chinese Journal of Chemical engineering 2024年第3期67卷 195-205页

作者： Chuanjun Di Jipeng Dong Fei Gao Guanghui Chen Pan Zhang Jianlong Li Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China College of Electromechanical Engineering Qingdao University of Science and TechnologyQingdao 266043China

It is of vital significance to investigate mass transfer enhancements for chemical engineering *** work focuses on investigating the coupling influence of embedding wire mesh and adding solid particles on bubble motion and gas-liquid mass transfer process in a bubble *** image velocimetry(PIV)technology was employed to analyze the flow field and bubble motion behavior,and dynamic oxygen absorption technology was used to measure the gas-liquid volumetric mass transfer coefficient(kLa).The effect of embedding wire mesh,adding solid particles,and wire mesh coupling solid particles on the flow characteristic and kLa were analyzed and *** results show that the gas-liquid interface area increases by 33%-72%when using the wire mesh coupling solid particles strategy compared to the gas-liquid two-phase flow,which is superior to the other two strengthening *** with the system without reinforcement,kLa in the bubble column increased by 0.5-1.8 times with wire mesh coupling solid particles method,which is higher than the sum of kLa increases with inserting wire mesh and adding particles,and the coupling reinforcement mechanism for affecting gas-liquid mass transfer process was discussed to provide a new idea for enhancing gas-liquid mass transfer.

关键词： Fluid mechanics Bubble Mass transfer Wire mesh coupling solid particles Particle image velocimetry Hydrodynamics

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Analysis of the nutation and precession of the vortex core and the influence of operating parameters in a cyclone separator

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Chinese Journal of Chemical engineering 2022年第6期35卷 1-10页

作者： Pan Zhang Guanghui Chen Weiwen Wang Guodong Zhang Huaming Wang College of Electromechanical Engineering and Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province Qingdao University of Science and TechnologyQingdao 266069China College of Chemical Engineering Qingdao University of Science and TechnologyQingdao 266043China School of Naval Architecture and Electrical Engineering Zhejiang Ocean UniversityZhoushan 316022China

Vortices motion in the anisotropic turbulent flow of cyclones makes a vital impact on flow stability and collection ***,there remains a lack of clarity in the overall feature of vortices *** this work,a numerical analysis was conducted to clarify the complex motion of the vortex core in a cyclone *** validity of the numerical model was demonstrated by comparing the computational results with experimental data in the *** revealed by the results,the vortex core not only has a precession motion about the geometrical center axis but also does a nutation motion in the axial *** frequencies of the precession motions show two main *** the magnitudes of the precession and nutation motions have non-uniform distributions in the ***,the precession-nutation motions of the vortex cores exhibit a similar fluctuant pattern to the dust ring on the separator *** inlet gas velocity and the inlet solid loading show vital effects on the magnitudes and frequencies of precession and nutation motion.

关键词： Cyclone separator Precession vortex core Nutation motion separation efficiency Numerical simulation Fluid mechanics

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Enhanced extraction of essential oil from Cinnamomum cassia bark by ultrasound assisted hydrodistillation

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Chinese Journal of Chemical engineering 2021年第8期34卷 38-46页

作者： Guanghui Chen Fengrui Sun Shougui Wang Weiwen Wang Jipeng Dong Fei Gao Key Laboratory of Mutiphase Flow Reaction and Separation Engineering of Shandong Province College of Chemical EngineeringQingdao University of Science and TechnologyQingdao 266042China Fundamental Chemistry Experiment Center(Gaomi) Qingdao University of Science and TechnologyGaomi 261500China

Cinnamon essential oil with many bioactivities is an important raw material for the production of various chemicals,and the conventional hydrodistillation(HD)for cinnamon oil extraction always require a longer extraction *** this work,ultrasound-assisted hydrodistillation extraction(UAHDE)technique was employed to enhance the extraction efficiency of essential oils from cinnamon *** parameters with significant effects on the essential oil extraction efficiency(ultrasound time,ultrasound power,extraction time,liquid–solid ratio)were optimized,and the proposed UAHDE was compared with the conventional HD extraction in terms of the extraction time,extraction yield,and physicochemical properties of extracted *** to the HD extraction,the UAHDE resulted in a shorter extraction time and a higher extraction *** GC–MS analysis,the UAHDE provided more valuable essential oil with a high content of the vital trans-cinnamaldehyde compounds compared with the *** electron micrograph(SEM)confirmed the efficiency of ultrasound irradiation for cinnamon oil *** addition,the analysis of electric consumption and CO_(2) emission shows that the UAHDE process is a more economic and environment-friendly ***,UAHDE is an efficient and green technology for the cinnamon essential oil extraction,which could improve the quantity and quality of cinnamon oils.

关键词： Cinnamon oil Extraction Ultrasound Distillation Optimization Chemical composition

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Investigation of Heat Transfer Enhancement in CNT/Water Nanofluid Nuclear Boiling Using VOF-DPM Model in CFD Simulation 10

Investigation of Heat Transfer Enhancement in CNT/Water Nano...

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10th International Conference on Advances in Machinery, Material Science and engineering Application, MMSE 2024

作者： Shen, Zongwang Chen, Guanghui Duan, Jihai Key Laboratory of Multiphase Fluid Reaction and Separation Engineering of Shandong Province College of Chemical Engineering Qingdao University of Science and Technology Qingdao266042 China

ISBN: (纸本)9781643685465

The study investigates the nuclear state boiling heat transfer characteristics of deionized water and CNT/water nanofluids using the VOF-DPM model in CFD. The VOF method is utilized to handle bubble behavior in the continuous phase, while the DPM model simulates the impact of suspended nanoparticles on heat transfer during phase change. Analysis of simulation results focuses on bubble behavior in nanofluid phase change heat transfer, flow field behavior near the heating surface caused by bubble growth and detachment, and a comparison with deionized water to understand the enhanced heat transfer mechanism of nanofluids. Numerical simulations demonstrate that adding CNT nanoparticles to water enhances the boiling flow field strength near the heating surface, promoting bubble detachment and improving heat transfer efficiency. The high thermal conductivity of CNT enhances the thermal conductivity of the liquid and enhances the heat conduction so that the liquid can warm up faster, and finally, due to the irregular movement of CNT nanoparticles can weaken the heat transfer boundary layer and reduce the thermal resistance of heat transfer enhances the heat transfer. © 2024 The Authors.

关键词： Deionized water

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Synthesis of Co3o4@C/Ti3c2tx Mxene-Type Composites for Enhanced Electromagnetic Wave Absorption

SSRN

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SSRN 2024年

作者： Hou, Yunxi Jia, Zhen Zheng, Hanli Hu, Zewei Shen, Lu Liu, Dongyu Li, Lu Liu, Shiwei Liu, Yue Yu, Shitao Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province State Key Laboratory Base of Eco-chemical Engineering College of Chemical Engineering Qingdao University of Science and Technology Qingdao266042 China A VIC Research Institute for Special Structures of Aeronautical Composites 19 Jiqi Road Jinan250000 China

Highly efficient microwave absorbing materials have attracted widespread attention due to the harmful effects of electromagnetic pollution on the human body and electronic equipment. In this paper, Co3O4@C composites with core-shell structure were prepared by hydrothermal method using a simple strategy, and then Ti3C2Tx was assembled with core-shell Co3O4@C by electrostatic self-assembly method, which resulted in the successful attachment of Co3O4@C to the lamellar structure of Ti3C2Tx and the formation of MXene-based composite wave-absorbing Co3O4@C/Ti3C2Tx material. The composites exhibit strong electromagnetic wave absorption when the mass ratio of Co3O4@C to Ti3C2Tx was 1:2, with a minimum reflection loss of -35.2 dB at a matched thickness of only 4.5 mm. Excellent electromagnetic wave absorption performance Co3O4@C/Ti3C2Tx composite material was mainly attributed to the synergistic effect of the multiple reflection absorption of the core-shell structure and the high conductivity and large specific surface area of MXene material. These results indicate that Co3O4@C/Ti3C2Tx composites were promising candidates for electromagnetic absorption and provide new ideas for the design of MXene-based magnetic absorption materials. © 2024, The Authors. All rights reserved.

关键词： Composite materials

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Synthesis of Fe3o4@Sio2@C/Ni Microspheres for Enhanced Electromagnetic Wave Absorption

SSRN

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SSRN 2023年

作者： Zhang, Jingyun Jia, Zhen Lv, Fanglin Hou, Yunxi Liu, Jianfeng Yu, Shitao Jiang, Long Liu, Yue Liu, Shiwei Li, Lu Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province State Key Laboratory Base of Eco-chemical Engineering College of Chemical Engineering Qingdao University of Science and Technology Qingdao266042 China AVIC Research Institute for Special Structures of Aeronautical Composites 19 Jiqi Road Jinan250000 China Qingdao University of Science and Technology China

With the rapid development of electromagnetic technology and radar, military stealth technology was an important indicator to measure the country's military, and wave-absorbing materials had emerged. In this paper, the absorbing material with a bilayer core-shell structure of Fe3O4@SiO2@C/Ni was prepared and characterized for its structure, composition electromagnetic, etc. The analysis showed that the double-layer core-shell structure was clearly visible and had excellent electromagnetic properties. By varying the thickness of carbon layer and SiO2 layer, the absorption performance of the prepared samples could be adjusted to achieve the best impedance matching. The sample had a minimum reflection loss of-38.5 dB and a maximum effective bandwidth of 7 GHz when its thickness was 4.5 mm, making it a promising choice for absorbing material applications. © 2023, The Authors. All rights reserved.

关键词： Magnetite

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Enhanced photodynamic therapy of mixed phase TiO2（B）/anatase nanofibers for killing of HeLa cells

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Nano Research 2014年第11期7卷 1659-1669页

作者： Shuchao Zhang Dongjiang Yang Dengwei Jing Hongwei Liu Long Liu Yi Jia Meihua Gao Liejin Guo Ziyang Huo Department of Blood Transfusion the Affifiated Hospital of Medical College Qingdao University Oingdao 266003 China Department of Immunology Medical College of Qingdao University Qingdao266000 China Collaborative Innovation Centre for Marine Biomass Fibers Materials and Textiles of Shandong Province College of Chemical and Environmental Engineering Qingdao University Qingdao China Queensland Micro- and Nanotechnology Centre (QMNC) Griffith University Nathan Brisbane QLD 4111 Australia International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering College of Chemistry Chemical and Environmental Engineering Xi'an Jiaotong University Xi'an 710049 China Australian Centre for Microscopy and Microanalysis (ACMM) the University of Sydney Sydney NSW 2006 Australia

Photodynamic therapy （PDT）, which is a procedure that uses photosensitizing drug to apply therapy selectively to target sites, has been proven to be a safe treatment for cancers and conditions that may develop into cancers. Nano-sized TiO2 has been regarded as potential photosensitizer for UV light driven PDT. In this study, four types of TiO2 nanofibers were prepared from proton tri-titanate （H2T3O7） nanofiber. The as-obtained nanofibers were demonstrated as efficient photosensitizers for PDT killing of HeLa cells. MTT assay and flow cytometry （FCM） were carried out to evaluate the biocompatibility, percentage of apoptotic cells, and cell viability. The non-cytotoxicity of the as-prepared TiO2 nanofibers in the absence of UV irradiation has also been demonstrated. Under UV light irradiation, the TiO2 nanofibers, particularly the mixed phase nanofibers, displayed much higher cell-killing efficiency than Pirarubicin （THP）, which is a common drug to induce the apoptosis of HeLa cells. We ascribe the high cell- killing efficiency of the mixed phase nanofibers to the bandgap edge match and stable interface between TiO2（B） and anatase phases in a single nanofiber, which can inhibit the recombination of the photogenerated electrons and holes. This promotes the charge separation and transfer processes and can produce more reactive oxygen species （ROS） that are responsible for the killing of HeLa cells.

关键词： photodynamic therapy titanium oxides (TiO2) nanomaterials apoptosis mixed phase

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A [email protected] reinforced concrete structure derived from nickel foam for efficient visible-light H 2 production

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Chemical engineering Journal 2020年 393卷

作者： Chao Zhang Baoquan Liu Xi Cheng ZhenMei Guo Tao Zhuang Zhiguo Lv State Key Laboratory Base for Eco-chemical Engineering Key Laboratory of Multiphase Flow Reaction and Separation Engineering of Shandong Province College of Chemical Engineering Qingdao University of Science and Technology Qingdao 266042 China Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology Guangxi University Nanning 530004 China Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) College of Chemistry Nankai University Tianjin 300071 China

High-efficient noble-metal-free photocatalyst is vital to realize high H 2 evolution. In consideration of this, we design a [email protected] reinforced concrete structure derived from nickel foam (NF) via a simple one-pot oil bath strategy. The whole preparation process is started with the growth of NiS rods on NF. Subsequently, NiS rods are encased in CdS gradually under oil both conditions. After the combination of NiS rods and CdS, the photoelectrical properties of primeval CdS are greatly optimized, e.g. , photoelectric responsiveness, impedance and light absorption capacity. Moreover, the H 2 evolution rate of [email protected] is increased significantly from 2706 to 40601 μmol g −1 h −1 under visible-light irradiation (λ > 420 nm), which is about 15 times higher than that of pure CdS, thereby confirming the excellent synergistic effect between NiS rods and CdS. Additionally, the photocatalytic performance of [email protected] was stronger than that of CdS/NiS-NPs (6726 μmol g −1 h −1 ) and CdS-NPs/NiS (1639 μmol g −1 h −1 ), highlighting the advantages of CdS (prepared using oil bath treatment) and NiS rods (originated from NF growth). Lastly, according to experiment data and DFT calculation results, a viable mechanism for [email protected] is tentatively proposed.

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