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Chinese Journal of Aeronautics 2023年第1期36卷 423-433页

作者： Jipeng CHEN Shouchun XIE He HUANG School of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing 210037China Nanjing Huirui Photoelectric Technology Co. LtdNanjing 211121China

Real-time mixing of multi-species powder challenges Laser Metal Deposition(LMD)of Functionally Graded Materials(FGMs).The current work proposes a novel method of using a static mixer to realize rapid,uniform multi-species powder ***,copper powder and 316L stainless steel powder are selected to complete the powder mixing observation experiment with Scanning Electron Microscope(SEM)and Energy Dispersive Spectrometer(EDS).Secondly,computational fluid dynamics and particle mixing simulation models are used to analyze the flow field and particle motion characteristics in the static ***,LMD experiment and metallo-graphic observation are carried out with 316L stainless steel powder and WC powder to verify the feasibility of the static *** study provides a theoretical and practical basis for powder mixing in laser processing with a static *** conclusions can also be applied to other processing fields requiring real-time and uniform mixing of multi-species powders.

关键词： Homogeneity Laser metal deposition Multi-species powder Mixing static mixer

Solvent extraction of Ce(Ⅲ) and Pr(Ⅲ) with P507 using SiC foam as a static mixer

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Journal of Rare Earths 2022年第4期40卷 676-686,I0006页

作者： Ye Zhang Yong Gao Peng Wang Duo Na Zhenming Yang Jinsong Zhang School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Extraction reactor is a major research area of interest within the field of rare earths extraction and *** foam offers excellent material characteristics as well as three-dimensional(3-D) reticulated structure;however,very little research has been carried out on its application in extraction reactor so *** this work,a static mixer reactor based on SiC foam was designed and demonstrated to extract and separate Ce(Ⅲ) and Pr(Ⅲ) from nitric acid media by using 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester(P507) as *** structure-performance relationship between SiC foam and extraction performance was studied by experiment combined with computational fluid dynamics(CFD)*** experiment data are in good agreement with the simulation *** experiment by using a Kenics mixer was carried out,and SiC foam shows better extraction and mass transfer *** the optimal structural SiC foam(pore size D=2.3 mm,open porosity ε=85%,foam length L=80 mm),high extraction efficiency η(Pr(Ⅲ):94.6%,Ce(Ⅲ):88.5%) and separation factor β(2.27) between Ce(Ⅲ) and Pr(Ⅲ) is achieved at a high total throughput of 200 mL/***,overall volumetric mass transfer coefficient K_(L)a of Pr(Ⅲ) and Ce(Ⅲ) are 0.519 and 0.378 s^(−1) at the residence time τ of 3.6 s,respectively,which reach the high level of microchannel reactors and are better than conventional extractors and other static *** foam is found to be applicable as a static mixer for efficient and high-throughput extraction and separation of rare earths.

关键词： SiC foam Extraction static mixer Simulation Rare earths

Conversion enhancement of tubular fixed-bed reactor for Fischer-Tropsch synthesis using static mixer

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Journal of Natural Gas Chemistry 2012年第4期21卷 435-444页

作者： Phavanee Narataruksa Sabaithip Tungkamani Karn Pana-Suppamassadu Phongsak Keeratiwintakorn Siriluck Nivitchanyong Piyapong Hunpinyo Hussanai Sukkathanyawat Prayut Jiamrittiwong Visarut Nopparat Department of Chemical Engineering Faculty of EngineeringKing Mongkut's University of Technology North BangkokBangkok 10800Thailand Research and Development Center for Chemical Engineering Unit Operation and Catalyst Design(RCC) STRI BuildingFloor 1st and 7th(Room 702)King Mongkut's University of Technology North BangkokBangkok 10800Thailand Department of Industrial Chemistry Faculty of Applied ScienceKing Mongkut's University of Technology North BangkokBangkok 10800Thailand Department of Electrical Engineering Faculty of EngineeringKing Mongkut's University of Technology North BangkokBangkok 10800Thailand National Science and Technology Development Agency(NSTDA) Klong luangPathumthani 12120Thailand

Recently, Fischer-Tropsch synthesis （FTS） has become an interesting technology because of its potential role in producing biofuels via Biomass- to-Liquids （BTL） processes. In Fischer-Tropsch （FT） section, biomass-derived syngas, mainly composed of a mixture of carbon monoxide （CO） and hydrogen （H2）, is converted into various forms of hydrocarbon products over a catalyst at specified temperature and pressure. Fixed-bed reactors are typically used for these processes as conventional FT reactors. The fixed-bed or packed-bed type reactor has its drawbacks, which are heat transfer limitation, i.e. a hot spot problem involved highly exothermic characteristics of FT reaction, and mass transfer limitation due to the condensation of liquid hydrocarbon products occurred on catalyst surface. This work is initiated to develop a new chemical reactor design in which a better distribution of gaseous reactants and hydrocarbon products could be achieved, and led to higher throughput and conversion. The main goal of the research is the enhancement of a fixed-bed reactor, focusing on the application of KenicsTM static mixer insertion in the tubular packed-bed reactor. Two FTS experiments were carried out using two reactors i.e., with and without static mixer insertion within catalytic beds. The modeled syngas used was a mixed gas composed of H2/CO in 2 ： 1 molar ratio that was fed at the rate of 30 mL（STP）·min^- 1 （GHSV ≈ 136 mL·gcat^-1 ·h^-1） into the fixed Ru supported aluminum catalyst bed of weight 13.3 g. The reaction was carried out at 180 ℃ and atmospheric pressure continuously for 36 h for both experiments. Both transient and steady-state conversions （in terms of time on stream） were reported. The results revealed that the steady-state CO conversion for the case using the static mixer was approximately 3.5 times higher than that of the case without static mixer. In both cases, the values of chain growth probability of hydrocarbon products （α） for Fischer-Tropsch synthesis were

关键词： Fischer-Tropsch synthesis fixed-bed reactor packed-bed reactor static mixer

In-situ powder mixing for laser-based directed energy deposition of functionally graded materials

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Advances in Manufacturing 2024年第1期12卷 150-166页

作者： Ji-Peng Chen Shou-Chun Xie He Huang School of Mechanical and Electronic Engineering Nanjing Forestry UniversityNanjing210037People’s Republic of China Nanjing Huirui Photoelectric Technology Co. LtdNanjing211121People’s Republic of China

The mixing of powders is a highly relevant field under additive manufacturing,however,it has attracted limited interest to *** in-situ mixing of various powders remains a significant *** paper proposes a new method utilizing a static mixer for the in-situ mixing of multiple powders through the laser-based directed energy deposition(DED)of functionally graded ***,a powder-mixing experimental platform was established;WC and 316L powders were selected for the mixing ***,scanning electron microscopy,energy dispersive spectroscopy,and image processing were used to visually evaluate the homogeneity and proportion of the in-situ mixed ***,powder-mixing simulations were conducted to determine the powder-mixing *** the simulations,a powder carrier gas flow field and particle mixing were ***,a WC/316L metal matrix composite sample was produced using laser-based DED to verify the application potential of the static *** was found that the static mixer could adjust the powder ratio online,and a response time of 1–2 s should be considered when adjusting the ratio of the mixed powder.A feasible approach for in-situ powder mixing for laser-based DED was demonstrated and investigated,creating the basis for functionally graded materials.

关键词： Laser Deposition static mixer Powder mixing Functionally graded materials

Combined static mixers for high viscous fluids mixing

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Frontiers of Chemical Science and Engineering 2009年第1期3卷 93-96页

作者： Zhenhao XI Weizhen SUN Ling ZHAO Zhaoyan LIU State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China Beijing Innovation Polymerization Technology Company Beijing 100050China

A new static mixer Cross-over-Disc has been invented to strip off the boundary layer and to make strong radial *** pressure drop of Cross-over-Disc is 12–26 times as large as that of empty pipe with equivalent diameter and *** mixing performance of Cross-over-Disc with 14 elements has been investigated in the viscosity range of 190–250 Pa·s by decoloration method,and the gray analysis of images shows that mixing inhomogeneity is about 7.5%and 9.4%for the mixing ratio of 5∶1 and 10∶1,***,mixing inhomogeneity for a combination of static mixing elements(four from Cross-over-Disc and three pairs from Sulzer-type)can be decreased to 2.1%–3.1%within a reasonable range of pressure drop.

关键词： static mixer Cross-over-Disc pressure drop mixing performance high viscousﬂuid

Numerical Analysis of Urea Decomposition with static mixers in Marine SCR System

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Numerical Analysis of Urea Decomposition with Static Mixers ...

Comparison between Two Urban Wastewater Primary Treatment Trains

作者： Cheolyong Choi Yonmo Sung Gyung Min Choi Duck Jool Kim School of Mechanical Engineering Pusan National University

A numerical simulation for urea decomposition into ammonia with static mixers was performed for marine selective catalytic *** types of mixer were considered to improve urea into ammonia conversion *** effect of each mixer such as pressure drop,particle residence time,and uniform distribution of urea water solution was investigated using three dimensional CFD *** mixer regardless of a type was improved urea *** performance could be affected by high pressure drop caused by ***,the proper mixer should be chosen in permissible level of pressure drop as well as ammonia conversion rate.

关键词： Selective catalytic reduction(SCR) static mixer urea decomposition urea water solution(UWS)

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Journal of Environmental Science and Engineering(A) 2022年第6期11卷 195-200页

作者： Alfonso Espitia-Cabrera Berenice Quintana-Díaz Joséde Jesús Naranjo Sánchez Alejandro Reyes Martínez Griselda Gonzalez Cardoso Energy Department Metropolitan Autonomous UniversityAzcapotzalco CDMX 02200Mexico

This paper evaluated two different wastewater primary treatments of wastewater from the“Universidad Autonoma Metropolitana,Azcapotzalco Campus”,a conventional one integrated for coagulation,flocculation,sedimentation and filtration versus one alternative integrated for in-line coagulation to precondition to rapid *** wastewater was from the Azcapotzalco Campus in Mexico City,and in both cases,we characterized the wastewater,measured:pH,conductivity,temperature,total dissolved solids,dissolved oxygen,ORP(Oxide Reduction Potential),turbidity,and COD(Chemical Oxygen Demand).Conventional treatment was slightly better treatment,but the alternative treatment represents saving in equipment,reactive,energy and time,so it was considered a viable technical and economic wastewater primary treatment.

关键词： Wastewater primary treatment rapid filter performance static mixer

Design and Engineering Application of Direct Mixing Lubrication System for Emulsion Pipeline in Secondary Cold Rolling Mill

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Mechanical Engineering Science 2020年第1期2卷 36-47页

作者： Hangzhe DONG Yazhen ZHANG Wantong HU Zhen-hua BAI Yan-yan ZHANG National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityYanshan UniversityQinhuangdaoChina State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdaoChina

With the benefit fierce competition in the steel industry market in recent years,double cold reduction products have been developed towards strength improvement and thickness *** traditional cold-rolling lubrication process with a fixed flow rate and concentration cannot solve the problems,which are uncontrollable plate shape and the excessive consumption of lubricating ***,based on the analysis of the traditional direct aplication lubrication system of double cold reduction mill,a set of design scheme suitable for the emulsion pipeline direct mixing lubrication system of double cold reduction mill unit was *** design completed the selection of key components,which included the static mixer and atomization nozzle selection,pump and oil pump design selection,pipeline design selection,flow type selection,pressure gauge selection,electronic control cabinet design selection and other eight *** of the emulsion pipeline direct mixing lubrication system of double cold reduction has been *** with characteristics of the traditional direct aplication lubrication system,the emulsion pipeline direct mixing lubrication system was better applied to the production practice of a 1220 double cold reduction *** consumption of ton of steel was reduced by 9.6%.The rolling energy consumption and fuel consumption comprehensive costs decreased by 10.7%,and the strip steel section thickness difference was reduced by 19.3%.In addition,the plate shape quality defect rate decreased by 25.6%,otherwise creating a large economic benefit for the unit and promoting the application value.

关键词： double cold reduction emulsion direct mixing lubrication system static mixer plate thickness