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Numerical simulation and experimental study of the characteristics of packing feature size on liquid flow in a rotating packed bed

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Chinese Journal of Chemical Engineering 2021年第6期34卷 22-31页

作者： Xifan Duan zhiguo yuan Youzhi Liu Hangtian Li Weizhou Jiao Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of ChinaTaiyuan 030051China

Rotating packed bed has high efficiency of gas-liquid mass *** it is significant to investigate fluid motion in rotating packed *** simulations of the effects of packing feature size on liquid flow characteristics in a rotating packed bed are reported in this *** particle image velocimetry is compared with the numerical simulations to validate the turbulent *** show that the liquid exists in the packing zone in the form of droplet and liquid line,and the cavity is *** the radial thickness of the packing is less than 0.101 m,liquid line and droplets appear in the *** rotational speed and radial thickness of the packing increase,the average diameter of the droplets becomes smaller,and the droplet size distribution becomes *** the initial velocity of the liquid increases,the average droplet diameter increases and the uniformity of particle size distribution become *** droplet velocity increases with the radial thickness of the packing increasing,and gradually decreases when it reaches the cavity *** effect of packing thickness is most substantial through linear *** predicted and simulated values are within±15%.The cumulative volume distribution curves of the experimental and simulated droplets are consistent with the R-R distribution.

关键词： Chemical process strengthening equipment Rotating packed bed Computational fluid dynamics Particle image velocimetry Sieve packing

Nitrogen and phosphorus removal in pilot-scale anaerobic-anoxic oxidation ditch system

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Journal of Environmental Sciences 2008年第4期20卷 398-403页

作者： PENG Yongzhen HOU Hongxun WANG Shuying CUI Youwei zhiguo yuan Key Laboratory of Beijing for Water Environment Recovery Engineering Beijing University of Technology Beijing 100022 China Advanced Wastewater Management Centre （AWMC） the University of Queensland St. Lucia Brisbane 4072 Australia

To achieve high efficiency of nitrogen and phosphorus removal and to investigate the rule of simultaneous nitrification and denitrification phosphorus removal （SNDPR）, a whole course of SNDPR damage and recovery was studied in a pilot-scale, anaerobicanoxic oxidation ditch （OD）, where the volumes of anaerobic zone, anoxic zone, and ditches zone of the OD system were 7, 21, and 280 L, respectively. The reactor was fed with municipal wastewater with a flow rate of 336 L/d. The concept of simultaneous nitrification and denitrification （SND） rate （rSND） was put forward to quantify SND. The results indicate that：（1） high nitrogen and phosphorus removal efficiencies were achieved during the stable SND phase, total nitrogen （TN） and total phosphate （TP） removal rates were 80% and 85%, respectively; （2） when the system was aerated excessively, the stability of SND was damaged, and rSND dropped from 80% to 20% or less; （3） the natural logarithm of the ratio of NOx to NH4^＋ in the effluent had a linear correlation to oxidation-reduction potential （ORP）; （4） when NO3^- was less than 6 mg/L, high phosphorus removal efficiency could be achieved; （5） denitrifying phosphorus removal （DNPR） could take place in the anaerobic-anoxic OD system. The major innovation was that the SND rate was devised and quantified.

关键词： oxidation ditch biological nitrogen removal biological phosphorus removal simultaneous nitrification and denitrification (SND) pilot scale municipal wastewater

Applications of high-gravity technologies in gas purifications: A review

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Chinese Journal of Chemical Engineering 2019年第6期27卷 1361-1373页

作者： Jing Guo Weizhou Jiao Guisheng Qi zhiguo yuan Youzhi Liu Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering School of Chemical Engineering and TechnologyNorth University of ChinaTaiyuan 030051China National Demonstration Center for Experimental Comprehensive Chemical Engineering Education North University of ChinaChina

The traditional gas purification techniques such as wet gas desulfurization, with their advantages of large-scale implementation and maturity, have still been widely used. However, the main drawback of these techniques is the low transfer efficiency, which normally needs towers as tall as tens of meters to remove the pollutants. Therefore, new technologies which could enhance the mass transfer efficiency and are less energy-intensive are highly desirable. As a process intensification technology, high-gravity technology, which is carried out in a rotating packed bed(RPB), has recently demonstrated great potential for industrial applications due to its high mass transfer efficiency, energy-saving, and smaller volume. This consequently provides higher efficiency in toxic gas removal, and can significantly reduce the investment and operation costs. In this review, the mechanism,characteristics, recent developments, and the industry applications of high-gravity technologies in gas purifications, such as hydrogen sulfide, nitrogen oxide, carbon dioxide, sulfur dioxide, volatile organic compounds and nanoparticle removal are discussed, most of the demonstration projects and practical application examples in gas purification come from China. The perspective and prospective of this technology in gas purification and other fields are also briefly discussed.

关键词： High gravity technology Rotating packed bed(RPB) Gas purification Desulfurization Pollution

Methane and nitrous oxide emissions from a subtropical coastal embayment(Moreton Bay, Australia)

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Journal of Environmental Sciences 2015年第3期27卷 82-96页

作者： Ronald S.Musenze Ursula Werner Alistair Grinham James Udy zhiguo yuan Advanced Water Management Centre (AWMC) The University of Queensland Department of Civil and Environmental Engineering College of Engineering Design Arts and Technology Makerere University School of Civil Engineering The University of Queensland Healthy Waterways Ltd.

Surface water methane （CH4） and nitrous oxide （N20） concentrations and fluxes were investigated in two subtropical coastal embayments （Bramble Bay and Deception Bay, which are part of the greater Moreton Bay, Australia）. Measurements were done at 23 stations in seven campaigns covering different seasons during 2010-2012. Water-air fluxes were estimated using the Thin Boundary Layer approach with a combination of wind and currents-based models for the estimation of the gas transfer velocities. The two bays were strong sources of both CH4 and N2O with no significant differences in the degree of saturation of both gases between them during all measurement campaigns. Both CH4 and N2O concentrations had strong temporal but minimal spatial variability in both bays. During the seven seasons, CH4 varied between 500% and 4000% saturation while N2O varied between 128 and 255% in the two bays. Average seasonal CH4 fluxes for the two bays varied between 0.5 ± 0.2 and 6.0 ± 1.5 mg CH4/（m^***） while N20 varied between 0.4 ± 0.1 and 1.6 ± 0.6 mg N2O/（m^2-day）. Weighted emissions （t CO2-e） were 63%-90% N2O dominated implying that a reduction in N2O inputs and/or nitrogen availability in the bays may significantly reduce the bays＇ greenhouse gas （GHG） budget. Emissions data for tropical and subtropical systems is still scarce. This work found subtropical bays to be significant aquatic sources of both CH4 and N2O and puts the estimated fluxes into the global context with measurements done from other climatic regions.

关键词： Greenhouse gas emissions Subtropical aquatic systems Bay Methane Nitrous oxide Uncertainty

Characterization of decellularized scaffold derived from porcine meniscus for tissue engineering applications

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Frontiers of Materials Science 2016年第2期10卷 101-112页

作者： Shuang GAO zhiguo yuan Tingfei XI Xiaojuan WEI Quanyi GUO Center for Biomaterial and Tissue Engineering Academy for Advanced Interdisciplinary Studies Peking University Beijing 100871 China Key Laboratory of PLA Institute of Orthopaedics Chinese PLA General Hospital Beijing 100853 China Department of Materials Science and Engineering College of Engineering Peking University Beijing 100871 China

Menisci are fundamental fibrocartilaginous organs in knee joints. The injury in meniscus can impair normal knee function and predisposes patients to osteoarthritis. This study prepared decellularized meniscus scaffolds using a 1% （w/w） sodium dodecyl sulfate solution and sufficient rinsing steps. Complete cell removal was verified by hematoxylin and eosin staining and DNA content assay. Decellularized menisci had accordant tension properties to intact ones, but with declined compression properties. This occurred because the collagen fiber was not damaged but glycosami- noglycans was significantly lost during the decellularization process, which was confirmed by biochemical assay and histology staining. In vitro cytotoxicity assay demonstrated that decellularized meniscus scaffolds have no toxicity on L929 murine fibroblasts and porcine chondrocytes. Further experiment showed that porcine chondrocytes could adhere and proliferate on the scaffold surface, and some cells even could infiltrate into the scaffold. All results showed the potential of this decellularized meniscus to be the scaffolds in tissue engineering.

关键词： meniscus scaffold decellularization biomechanical cytotoxicity tissueengineering

A turbulent mass diffusivity model for analyzing the mixing characteristics in an impinging stream-rotating packed bed

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Chinese Journal of Chemical Engineering 2024年第10期74卷 133-143页

作者： Chao Zhang Youzhi Liu Weizhou Jiao Guisheng Qi zhiguo yuan Qiaoling Zhang Hongyan Shen Shanxi Province Key Laboratory of Chemical Process Intensification North University of ChinaTaiyuan 030051China

In this study,the fluid flow and mixing process in an impinging stream-rotating packed bed(IS-RPB)is simulated by using a new three-dimensional computational fluid dynamics ***,the gaseliquid flow is simulated by the Euler-Euler model,the hydrodynamics of the reactor is predicted by the RNG k-εmethod,and the high-gravity environment is simulated by the sliding mesh *** turbulent mass transfer process is characterized by the concentration variance c^(2) and its dissipation rateεc formulations,and therefore the turbulent mass diffusivity can be directly *** simulated segregation index Xs is in agreement with our previous experimental *** simulated results reveal that the fringe effect of IS can be offset by the end effect at the inner radius of RPB,so the investigation of the coupling mechanism between IS and RPB is critical to intensify the mixing process in IS-RPB.

关键词： Impinging stream-rotating packed bed Turbulent mass diffusivity model Computational fluid dynamics Mixing performance Segregation index

Anoxic phosphorus removal in a pilot scale anaerobic-anoxic oxidation ditch process

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Frontiers of Environmental Science & Engineering 2009年第1期3卷 106-111页

作者： Hongxun HOU Shuying WANG Yongzhen PENG zhiguo yuan Fangfang YIN Wang GAN College of Environmental and Energy Engineering Beijing University of TechnologyBeijing 100022China Anhui Guozhen Environmental Protection Science and Technology Co. Ltd.Hefei 230088China Advanced Wastewater Management Centre(AWMC) The University of QueenslandSt LuciaBrisbaneQld 4072Australia

The anaerobic-anoxic oxidation ditch(A^(2)/O OD)process is popularly used to eliminate nutrients from domestic *** order to identify the existence of denitrifying phosphorus removing bacteria(DPB),evaluate the contribution of DPB to biological nutrient removal,and enhance the denitrifying phosphorus removal in the A^(2)/O OD process,a pilot-scale A^(2)/O OD plant(375 L)was *** the same time batch tests using sequence batch reactors(12 L and 4 L)were operated to reveal the significance of anoxic phosphorus *** results indicated that:The average removal efficiency of COD,NH^(+)_(4),PO^(3–)_(4),and TN were 88.2%,92.6%,87.8%,and 73.1%,respectively,when the steady state of the pilotscale A^(2)/O OD plant was reached during 31–73 d,demonstrating a good denitrifying phosphorus removal *** uptake took place in the anoxic zone by poly-phosphorus accumulating organisms NO^(-)_(2) could be used as electron receptors in denitrifying phosphorus removal,and the phosphorus uptake rate with NO^(-)_(2) as the electron receptor was higher than that with NO^(–)_(3) when the initial concentration of either NO^(-)_(2) or NO^(–)_(3) was 40 mg/L.

关键词： wastewater treatment anaerobic-anoxic(A^(2)/O) oxidation ditch(OD) biological phosphorus removal denitrifying phosphorus removal

High-Con cent rat ion Electrosynthesis of Formic Acid/Formate from CO_(2):Reactor and Electrode Design Strategies

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Energy & Environmental Materials 2023年第6期6卷 141-157页

作者： Yizhu Kuang Hesamoddin Rabiee Lei Ge Thomas E.Rufford zhiguo yuan John Bell Hao Wang Centre for Future Materials University of Southern QueenslandSpringfieldQLD 4300Australia Australian Centre for Water and Environmental Biotechnology(ACWEB formerly AWMC)The University of QueenslandSt.LuciaQLD 4072Australia School of Chemical Engineering The University of QueenslandBrisbaneQLD 4072Australia

The electrochemical CO_(2)reduction reaction(CO_(2)RR),driven by renewable energy,provides a potential carbon-neutral avenue to convert CO_(2)into valuable fuels and *** of CO_(2)into formic acid/formate is considered one of the economical and feasible methods,owing to their high energy densities,and ease of distribution and *** separation of formic acid/formate from the reaction mixtures accounts for the majority of the overall CO_(2)RR process cost,while the increment of product concentration can lead to the reduction of separation cost,*** this paper,we give an overview of recent strategies for highly concentrated formic acid/formate products in CO_(2)***_(2)RR is a complex process with several different products,as it has different intermediates and reaction ***,this review focuses on recent study strategies that can enhance targeted formic acid/formate yield,such as the all-solid-state reactor design to deliver a high concentration of products during the reduction of CO_(2)in the ***,some novel electrolyzers are introduced as an engineering strategy to improve the concentration of the formic acid/formate and reduce the cost of downstream ***,the design of planar and gas diffusion electrodes(GDEs)with the potential to deliver high-concentration formic acid/formate in CO_(2)RR is ***,the existing technological challenges are highlighted,and further research recommendations to achieve high-concentration products in CO_(2)*** review can provide some inspiration for future research to further improve the product concentration and economic benefits of CO_(2)RR.

关键词： electrochemical CO_(2)reduction reaction electrode design formic acid/formate high-concentration reactor design

Determination of the Henry’s Law Constant of Hexane in High-Viscosity Polymer Systems

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China Petroleum Processing & Petrochemical Technology 2023年第1期25卷 34-43页

作者： Qi Jibing Li Yuliang Liu Youzhi Yang Tong Liu Yandong yuan zhiguo Yi Jianjun Shanxi Province Key Laboratory of Higee-Oriented Chemical Engineering North University of ChinaTaiyuan 030051China Petrochemical Research Institute Petro China Co Ltd.Beijing 102206China

The Henry’s law constant of volatiles in polymer systems is a crucial parameter reflecting the gas-liquid equilibrium,which is very important for *** this research,polyolefin elastomer(POE)-cyclohexane and polydimethylsiloxane(PDMS)-hexane systems were studied,and the Henry’s law constant was obtained by measuring the gas phase equilibrium partial pressure when polymer solutions containing different mass fractions of volatiles reached a saturated *** effects of temperature,type of volatiles,and polymer viscosity on the gas phase equilibrium partial pressure and Henry’s law constant of the volatiles were *** results indicate that,with the increase of temperature and polymer viscosity,the gas phase equilibrium partial pressure and Henry’s law constant of volatiles *** temperature increases,the solubility of gas in liquid *** relationship between the Henry’s law constant and temperature is consistent with the Arrhenius *** the PDMS-hexane system,the gas phase equilibrium partial pressure and Henry’s law constant of n-hexane are higher than those of *** obtained Henry’s law constants can be used as a reference for perfecting the devolatilization process and improving the devolatilization effect.

关键词： Henry’s law constant gas-liquid equilibrium method hexane polyolefin elastomer(POE) polydimethylsiloxane(PDMS)