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《中国粉体技术》2017年第23卷第4期文章摘要
作者:管理员  来源:本站原创  发布时间:2017年8月28日  点击次数:178
 

正压拉法尔管仓泵气力输送硼钙石固体流量实验研究

段广彬, 刘 凤, 王文志, 李金凯, 刘宗明

(济南大学 材料科学与工程学院, 山东 济南 250022

摘要:针对目前工农业生产中部分工艺中对气力输送固相定量性要求较高的现状,建立常用的正压拉法尔管式仓泵气力输送系统,并建立后反馈自动控制系统。以硼钙石粉体为输送物料,分别采用精密称重传感器测试及超声测试方法研究输送过程中固体流量的变化规律。通过实验对比自动控制前后的固体输送能力的大小及稳定性发现,固体输送能力稳定输送时间段增加了16~18 s,自动控制后稳定段固体输送能力波动低于±8%,表明启动自动控制方案能更好地提高固体输送的稳定性。

关键词:正压拉法尔管式仓泵; 气力输送; 固体输送能力

中图分类号:TK83A    文献标志码:A

文章编号:1008-554820170-0001-05

Experimental research of positive pressure Laval nozzle bin pneumatic conveying bechilite powder

DUAN Guangbin LIU Feng WANG WenzhiLI Jinkai LIU Zongming

School of Material Science and Engineering University of Jinan Jinan 250022China

Abstract In view of the high requirement of solid phase quantification for pneumatic conveying in some parts of industrial & agricultural production a common positive pressure Laval nozzle bin pneumatic conveying system and back feed automatic control system were established. Experiments were carried out in this pneumatic conveying system by transporting bechilite powder. The trend of solid conveying capacity during the conveying process is obtained according to the results of precise weighing sensor test and ultrasonic testing method. Through the comparison of solid flow before and after automatic control it can be seen that the stable conveying time increases 16~18 s meanwhile the fluctuation of solid conveying capacity is less than±8% in condition of automatic control status. The results show that the automatic control scheme improves the stability of solid flow greatly.

Keywords: positive pressure Laval nozzle bin pneumatic conveying solid conveying capacity


供料方式对垂直螺旋输送机性能的影响

余书豪a 李永桥a 谌永祥a 李 翔b

(西南科技大学  a制造科学与工程学院; b 应用技术学院, 四川 绵阳 621010

摘要:为了研究供料口处物料呈现的不均匀现象,分别建立了重力型和水平型2种供料方式下的垂直螺旋输送机计算模型,采用离散元法,借助EDEM软件,通过试验和标定的方式对模拟参数,如进口速度、时间步长和颗粒属性参数进行确定,进而确保模型和参数选取的可行性;分别对2种供料方式进行模拟,以颗粒数标准偏差为评价指标。结果表明:与重力型供料相比,在相同的操作条件下,水平型供料方式在供料口取样区域的物料不均匀度更高,物料输送的均匀性更低,螺旋转速的改变对2种供料方式下取样区域颗粒质量分布的均匀性影响较大,针对重力型和水平型供料方式给出了结构改进建议。

关键词:垂直螺旋输送机; 供料方式; 离散元法; 力链网络; 颗粒不均匀度

中图分类号:TB44 TQ022.3    文献标志码:A

文章编号:1008-554820170-0006-07

Influence of feeding mode on performance of vertical screw conveyor

YU Shuhaoa LI YongqiaoaCHEN Yongxianga LI Xiangb

a.School of Manufacturing Science and Engineeringb Applied Technology School Southwest University of Science and Technology Mianyang 621010 China

Abstract In order to research the phenomeno of uneven conveying two calculation models with different feeding mode of vertical screw conveyor were built those were gravity type and horizontal type. The discrete element method and the software of EDEM were used. The simulation parameters such as inlet velocity time step and granule attribute parameters were identified thus the feasibility of model and parameters were ensured. The two models were simulated respectively. Standard deviation of number of granules was selected as the evaluation index. The results show that compared with the gravity type granules of sampling region in the feeding rim of the horizontal feeding mode have higher evenness and lower transporting uniformity. This two feeding modes are significantly affected by screw rotation. Some advice is given for the improvement of the two feeding types. The study results have a certain preference for the structure design of feeding rim in the screw conveyor.

Keywords: vertical screw conveyor feeding mode discrete element method force chain granules unevenness


外筒旋转型垂直螺旋输送机的设计

李 健, 马 飞, 贾瑞清

(中国矿业大学(北京) 机电与信息工程学院, 北京 100083

摘要:设计了一款外筒旋转型垂直螺旋输送机,采用离散元分析的方法建立输送性能与设计参数的关系,通过输送末页岩颗粒的试验验证其可行性。结果表明:通过改变外筒转速,可以调节外筒旋转型垂直螺旋输送机的填充率、输送量、驱功率和能耗效率。外筒转速越大,填充率越小;仿真模型外筒转速小于160 r/min时,输送量随外筒转速增大而增大,当外筒转速大于160 r/min时,输送量呈减小趋势;驱动功率随外筒转速增大而增大;能耗效率随外筒转速升高而降低;不需要强迫式给料装置,在一定输送高度内不需要中间轴承,结构更加简单;能够在低转速下运行,利于降低机械磨损、增加设备寿命,低速输送时能耗效率更高、更加节能。

关键词:散体物料; 垂直螺旋输送机; 外筒旋转; 螺旋叶片固定

中图分类号:TH224    文献标志码:A

文章编号:1008-554820170-0012-05

Design of casing-rotational vertical screw conveyor

LI Jian MA Fei JIA Ruiqing

School of Mechanical Electronic & Information Engineering China University of Mining & Technology Beijing), Beijing  100083China

Abstract A casing-rotational vertical screw conveyor was desighed discrete element method was used to establish the relationship between the design parameters and its performance and shale particle was transported to verify the feasibility of casing-rotational vertical screw conveyor. The results show that the casing-rotational vertical screw conveyor has the following characteristics. The filling rate conveying capacity driving power and mechanical efficiency of casing-rotational vertical screw conveyor can be adjusted by changing casing rotation speed. The higher the casing rotation speede is the lower. filling rate. When  the  casing  rotation  speed  of  simulation  model below 160 r/min conveying capacity is increased with the casing rotation speed increased. When the casing rotation speed of simulation model higher than 160 r/min  conveying capacity decline with the casing rotation speed increased. Driving power increases with the casing rotation speed increased. Energy efficiency increases with the increasing speed of the casing. The structure is simple because it has no need of forced feeding device and intermediate bearings are not required at a given conveying height. It can run with low speed and it is beneficial to reduce mechanical wear and increase equipment life. Energy efficiency is higher and more energy-saving when the equipment runs with low speed.

Keywords: granular material vertical screw conveyor casing rotation stationary helical blade


钐铁熔体高压雾化氮淬过程的数值模拟

王书桓, 张凯璇, 方云楚, 宋春燕, 赵定国

(华北理工大学 冶金与能源学院, 河北 唐山 063000

摘要:为探究钐铁熔体气雾化过程中高压环境和雾化介质组分对雾化结果的影响规律,基于紧耦合气雾化喷嘴结构,采用Fluent软件对熔体高压气雾化淬冷过程进行模拟,分析不同环境压力和氮气-氩气混合组分下的熔体雾化氮淬过程。结果表明,环境压力越大雾化效果越好,纯氮气组分下达到相对理想的雾化效果的最低环境压力为3.0 MPa;随着氩气含量的增加,雾化效果在较低的环境压力下提前达到相对理想的稳定程度,但过多的氩气不利于雾滴的冷却与后续熔体渗氮的研究,综合考虑雾化效果较理想的条件为,氮气、氩气体积比为13,环境压力为2.0 MPa

关键词:雾化模型; 氮淬; 环境压力; 气体组分

中图分类号:TF764+.1    文献标志码:A

文章编号:1008-554820170-0017-05

Numerical simulation on atomization and nitrogen quenching process of SmFe melt with high pressure

WANG Shuhuan ZHANG KaixuanFANG Yunchu SONG Chunyan ZHAO Dingguo

Metallurgy and Energy College North China University of Science and Technology Tangshan 063000 China

Abstract To explore the influence of ambient pressure and gas composition on the results in the atomization process of SmFe melt atomization and nitrogen quenching process of liquid SmFe alloy with high pressure was simulated using Fluent based on the close-coupled nozzle. Simulation results show that high ambient pressure can obviously improve the atomization effect and the minimum ambient pressure is 3.0 MPa when the atomization effect is relative ideal using pure N2 as atomized gas mix Ar to N2 can reduce the ambient pressure needed for the atomization but too much Ar can cause an adverse impact on the spray cooling and melt nitriding in summary when N2 content at 25% and the ambient pressure is 2.0 MPa atomizing effect gets its maxima.

Keywords: atomization model nitrogen quenching ambient pressure gas composition


加压下颗粒移动床空隙率实验研究

杨 晨1 徐 祥12 阳绍军12 刘小成12 李喜全12

1. 中国科学院工程热物理研究所 先进能源动力重点实验室, 北京 100190

2. 中国科学院能源动力研究中心, 江苏 连云港 222069

摘要:在移动床排料装置上,研究加压条件下移动床表观颗粒速度、表观气速及入口压力对并流移动床空隙率的影响。结果表明,在表观颗粒速度或表观气速不变的情况下,移动床空隙率随入口压力的升高而减小;在入口压力不变的情况下,移动床空隙率基本不随表观颗粒速度和表观气速变化。对实验结果进行非线性拟合,得到气固并流移动床空隙率的压力拟合公式,利用该拟合公式和Ergun方程可计算移动床压降,在实验数据范围内,计算压降与实验压降的最大偏差小于±10%

关键词:移动床; 空隙率; 压降

中图分类号:TB44    文献标志码:A

文章编号:1008-554820170-0022-05

Experimental research of voidage in granular moving bed

YANG Chen 1 XU Xiang12 YANG Shaojun12LIU Xiaocheng12LI Xiquan12

1. Key Laboratory of Advanced Energy and Power

Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China 2. Research Center for Clear Energy and Power Chinese Academy of Sciences Lianyungang 222069 China

Abstract The effects of inlet pressure superficial gas velocity and superficial solid velocity on the voidage of pressured moving bed were investigated experimentally. When superficial solid velocity or the superficial gas velocity stays the same the voidage decreases with the increase of the inlet pressure. However when the inlet pressure remains constant the superficial solid velocity superficial gas velocity have little influence on the voidage. It is found that the voidage can be calculated by ε=0.32+0.04067/Pin. With the fitting formula of voidage and Ergun equation the pressure drop can be conveniently calculated. The maximum deviation between the calculated values and experimental data is less than ±10%.

Keywords: moving bed voidage pressure drop


振动特性对颗粒混合均匀性影响的EDEM模拟

刘邱祖, 马 麟, 董凯凯, 成文浩

(太原理工大学 机械工程学院, 山西 太原 030024

摘要:应用工程离散单元法(Engineering  Discrete Element MethodEDEM)对密闭容器内不同外形颗粒在振动状态下的混合均匀度进行数值模拟,分析振动频率和振幅对粉体混合均匀度标准偏差的影响,并通过正交实验法和方差法对结果进行分析。结果发现:标准偏差随振动时间均表现出递减的变化规律,在6 s之后标准偏差随振动频率的增加呈现减小的变化规律,在4 s之后标准偏差随振幅的增加呈现增大的变化规律,通过正交计算得到振动频率对颗粒混合均匀性影响最大,其次是振幅,综合衡量采用90 Hz2 mm能获得最佳混合度,通过动态分析颗粒的运动速度验证了正交结果的准确性。

关键词:颗粒混合; 均匀性; 振动特性; 标准偏差

中图分类号:TB44    文献标志码:A

文章编号:1008-554820170-0027-05

EDEM simulation research on effect of vibration characteristic on particle mixing uniformity

LIU Qiuzu MA Lin DONG Kaikai CHENG Wenhao

College of Mechanical Engineering Taiyuan University of Technology  Taiyuan 030024 Chnia

Abstract By applying EDEM software in an airtight container under different shape of particles in the vibration state of mixing uniformity the numerical simulation and analysis of the vibration amplitude and frequency influence on powder mixed uniformity standard deviation were done and the orthogonal test design experiment and variance method was used to analyze the results. It is found that the standard deviation as the vibration time for all showed a decreasing change rule after the 6 s standard deviation present decrease with the increase of vibration frequency of the change rule after the 4 s standard deviation increases with the increase of vibration amplitude and present the change law of vibration frequency calculated by orthogonal had the greatest influence on particle mixing uniformity followed by the amplitude.  The  comprehensive  measure  is  obtained  that 90 Hz 2 mm which can  improve the maximum fission hybrid degre. Through dynamic analysis of the particle movement speed verified the accuracy of the results of orthogona.

Keywords: particle mixing uniformity vibration characteristics standard deviation


DDF型分解炉中NOx减排的数值模拟

陈作炳, 刘 宁, 汤 帅

(武汉理工大学 机电工程学院, 湖北 武汉 430070

摘要:为研究选择性非催化还原法对分解炉中NOx减排效果的影响,采用计算流体力学方法对DDF型分解炉进行数值模拟。以尿素为还原剂设计选择性非催化还原脱硝方案,对比分析各操作参数对NOx减排效果的影响。结果表明,还原剂喷射高度、喷嘴伸入距离、喷嘴数量等操作参数对NOx减排效果的影响较大,还原剂喷射速度对NOx减排效果的影响较小,且喷射高度为17 m,喷嘴伸入距离为0~0.6 m,喷嘴数量为4~8个,还原剂喷射速度为50~70 m/s时,分解炉中NOx减排效果较好。

关键词:分解炉; NOx减排; 数值模拟

中图分类号:TQ172.6    文献标志码:A

文章编号:1008-554820170-0032-07

Numerical simulation of NOx emission reduction on DDF precalciner

CHEN Zuobing LIU Ning TANG Shuai

School of Mechanical and Electronic Engineering Wuhan University of Technology Wuhan 430070 China

Abstract In order to study the effect of NOx emission reduction by selective non-catalytic reduction method in precalciner computational fluid dynamics method was used to simulated the DDF precalciner. The selective non-catalytic reduction denitration scheme was designed with urea as reducing agent and the effects of NOx emission reduction on different operating parameters were compared and analyzed. The results show that the operation parameters of injection height of reducing agent into distance and number of nozzle have great influence on NOx emission reduction the effect of the injection speed of the reducing agent is small. When injection height of reducing agent is 17 m into distance of nozzle is 0~0.6 m number of nozzle is 4~8 injection speed of the reducing agent is 50~70 m/s the effect of NOx emission reduction is better in precalciner.

Keywords: precalciner NOx emission reduction numerical simulation


采用比表面积和孔径分析仪测量纳米颗粒粒径

胡林彦

(中国科学院大连化学物理研究所 催化基础国家重点实验室, 辽宁 大连 116023

摘要:采用比表面积和孔径分析仪,利用颗粒堆积产生的孔隙大小与颗粒粒径之间存在的几何关系,通过测量纳米颗粒堆积产生的孔隙尺寸,实现了纳米颗粒粒径的测量。结果表明,对于粒径在30~70 nm的纳米颗粒,颗粒堆积产生的介孔尺寸与颗粒粒径之间存在良好的线性关系,通过工作曲线可快速获得粒径数值。尤其对于粒径小于100 nm的干燥颗粒,该方法具有良好的适用性,测量分辨率可达0.2 nm,测量结果具有统计意义。

关键词:纳米颗粒; 粒径测量; 比表面积; 孔径分析仪

中图分类号:TB302.1    文献标志码:A

文章编号:1008-554820170-0039-04

Measurement of nano-particle size using surface area and porosity analyzer

HU Linyan

State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

Abstract The size of nano-particle was measured using surface area and porosity analyzer by means of measuring the stack pore size around the nano-particles. The results showed that there are linear relationship between the stack pore size and the particle size with size from 30 to 70 nm the results of particle size can be read out precisely form the working curve. Especially for the particles with size small than 100 nm the measuring accuracy of this method reach to 0.2 nm and the results have statistical significance.

Keywords: nano-particle particle size measurement surface area porosity analyzer


小麦PFC模型细观参数标定方法的验证与分析

揣 君1 王录民1 许启铿1 刘永超2 蒋敏敏1

1. 河南工业大学 土木建筑学院, 河南 郑州 450001 2. 黄河科技学院 建筑工程学院, 河南 郑州 450063

摘要:为了验证PFC模型细观参数标定方法的可行性,以小麦试样为例,根据PFC软件提供的模型细观参数标定方法的要求,在实验室进行了三轴压缩试验,并利用PFC软件对实验室三轴压缩试验进行了数值模拟。结果表明:通过反复调整PFC模型细观参数能够使数值模拟结果与试验结果基本一致,但很难使二者完全吻合。同等条件下,数值模型的颗粒摩擦系数对偏应力峰值的影响显著,颗粒法向刚度控制偏应力-应变关系曲线的初始斜率,颗粒孔隙率影响偏应力-应变关系曲线达到峰值后的平缓趋势。

关键词:小麦; PFC模型; 细观参数; 标定方法

中图分类号:TS210    文献标志码:A

文章编号:1008-554820170-0043-06

Validation and analysis of calibration method for micro parameters of wheat PFC model

CHUAI Jun1 WANG Lumin1XU Qikeng1  LIU Yongchao2 JIANG Minmin1

1. School of Civil Engineering Henan University of Technology Zhengzhou 450001 China 2. School of Civil Engineering College of Huanghe Science & Technology Zhengzhou 450063 China

Abstract In order to verify the feasibility of calibration method for micro parameters of a PFC model, taking wheat samples as an example, according to the requirements of calibration method for micro parameters provided by PFC software, first, triaxial tests were conducted in laboratory, then, numerical triaxial tests to model the laboratory tests were conducted by PFC as well. Research shows that numerical results could approach experimental results by adjusting micro parameters repeatedly, but it is almost impossible to make them coincide with each other. Under the same level, the particle friction coefficient of numerical model has significant effects on deviatoric stress. The initial slope of curve of deviatoric stress and strain is controlled by particle normal stiffness. The tendency of curve of deviatoric stress and strain is impacted by particle porosity.

Keywords: wheat PFC model micro parameter calibration method


超低排放下低浓度可过滤颗粒物的手工测试

刘含笑, 姚宇平, 郦建国, 赵锡勇, 方小伟, 郭 滢

(浙江菲达环保科技股份有限公司, 浙江 诸暨 311800

摘要:对国内外超低排放条件下烟尘的高精度测试标准进行综述,并评述低浓度烟尘测试准确性,开展超低排放工程的现场实测,对低低温电除尘器、湿法脱硫及湿式电除尘器出口颗粒物浓度进行科学表征,以期为低浓度烟尘测试标准的修制定提供技术支撑。

关键词:烟尘; 超低排放; 燃煤电厂; 误差分析; 测量精度

中图分类号:X505; TK227.3    文献标志码:A

文章编号:1008-554820170-0049-05

Research of low concentration test method of PM for ultra-low emission

LIU Hanxiao YAO Yuping LI Jianguo ZHAO Xiyong FANG Xiaowei GUO Ying

Zhejiang Feida Environmental Science & Technology Co. Ltd. Zhuji 311800 China

Abstract The relevant test standards at home and abroad was analyzed the types and reasons of measurement error was studied and based on this field testing was done the ultra-low emission of smoke test accuracy was reviewed the outlet PM concentration of low-low temperature ESP WFGD and wet ESP were represented scientifically which can provide technical support for the smoke test standards.

Keywords: smoke ultra-low emission coal-fired power planterror analysis measurement accuracy


超临界水热合成法制备TiO2纳米粉体

张 拓, 王树众, 孙盼盼, 王来升, 杨健乔

(西安交通大学 能源与动力工程学院, 陕西 西安 710048

摘要:采用超临界水热合成法制备TiO2纳米粉体,研究反应条件包括温度、 压力、 反应时间对纳米粉体颗粒的粒径大小、形貌及结晶度的影响。结果表明,随着温度从亚临界升高到超临界,TiO2颗粒粒径急剧减小,且结晶度增大,最终合成10 nm左右结晶度良好的椭球形颗粒。颗粒在26~30 MPa的压力范围内,结晶度随着反应压力的增大而增大,但粉体粒径大小差别不大。在1 min的反应时间内即检测出了TiO2物相,而在5 min后生成了结晶良好的椭球形晶体,随着反应时间的增加,棒状的颗粒逐渐增多,这是由于发生了溶解-结晶机理。

关键词:超临界水热合成; 纳米颗粒; 形貌; 粒径; 结晶度

中图分类号:TQ134    文献标志码:A

文章编号:1008-554820170-0054-04

Preparation of titania nano-powder by supercritical hydrothermal synthesis

ZHANG Tuo WANG Shuzhong SUN PanpanWANG Laisheng YANG Jianqiao

School of Energy and Power Engineering Xian Jiaotong University  Xian 710048 China

Abstract TiO2 nano-powders were synthesized by supercritical hydrothermal synthesis SCHS technology. The effects of reaction conditions including temperature pressure reaction time on the particle size morphology and crystallinity were studied. The present results indicated that the particle size of synthesized TiO2 decreases dramatically but the crystallinity of particles increases with the temperature increasing from subcritical state to supercritical state. Finally ellipsoidal nanoparticles of 10 nm are obtained. In pressure range of 26~30 MPa higher pressure is found to be in favor of improving the crystallinity degree of TiO2 nano-particles but the particle size changes very little. The titania phase is detected in 1 min reaction time well-crystallized ellipsoid crystals are obtained when reaction time is 5 min. With the increase of reaction time the number of rod-shaped particles increases gradually. The particle growth seems to be driven by dissolving-crystallization mechanism.

Keywords: SCHS nano-particles morphology particle size crystallinity


低温水热合成制备Ce0.8Sm0.2O1.9电解质粉体

时焕岗, 李乾军, 吕荣莲

(南京工程学院 环境工程学院, 江苏 南京 211167

摘要:采用水热合成方法制备了Ce0.8Sm0.2O1.9电解质材料,水热合成的温度范围为120180 ℃。使用X射线衍射、扫描电镜及交流阻抗谱技术,分别表征了电解质粉体及电解质粉体的烧结样品。研究发现, 电解质粉体的晶粒尺寸在13 nm左右, 140 ℃合成的Ce0.8Sm0.2O1.9粉体具有更好的烧结性能和更高的离子电导率。

关键词:水热合成; 电解质; CeO2 电导率

中图分类号:TM911    文献标志码:A

文章编号:1008-554820170-0058-04

Low temperature hydrothermal synthesis of Ce0.8Sm0.2O1.9 electrolyte powders

SHI Huangang LI Qianjun LYU Ronglian

School of Environmental Engineering Nanjing Institute of Technology Nanjing 211167 China

Abstract Electrolyte materials Ce0.8Sm0.2O1.9 were synthesized via hydrothermal method at a temperature range of 120 to 180 . The electrolyte powders and sintered samples were characterized by XRDSEM and AC impedance respectively. The average grain sizes are about 13 nm and the powders synthesized at 140 have the better sinterability and higher ionic conductivity.

Keywords: hydrothermal synthesis electrolyte CeO2 conductivity


纳米Bi2O3的制备及其可见光催化活性

任振兴1 刘军营2 王梦亮1 刘滇生1

1. 山西大学 应用化学研究所, 山西 太原 030006 2. 上海交通大学 燃烧与环境技术研究中心, 上海 200240

摘要:采用共沉淀法制备纳米Bi2O3,并将其应用于光催化,研究不同热处理温度下制备的Bi2O3的光催化降解甲基橙的活性。通过扫描电子显微镜、X射线衍射、紫外-可见吸收光谱和荧光光谱表征Bi2O3的形貌、 结构、 光学及光催化活性。 结果表明:Bi2O3的光催化活性与热处理温度有关,热处理温度为400 ℃时,合成的Bi2O3在可见光照射180 min时,对甲基橙的降解率达到86 %。良好的可见光吸收和较低的光生载流子复合是获得优异光催化活性的主要原因。

关键词:Bi2O3 光催化; 甲基橙

中图分类号:TQ426    文献标志码:A

文章编号:1008-554820170-0062-05

Synthesis of Bi2O3 and its application for visible light photocatalysis

REN Zhenxing1 LIU Junying2 WANG Mengliang1 LIU Diansheng1

1. Institute of Applied Chemistry Shanxi University Taiyuan 030006 China 2. Research Center for Combustion and Environment Technology Shanghai Jiao Tong University Shanghai 200240 China

Abstract A facile co-precipitation method followed by thermal treatment was used to prepare Bi2O3. The morphology structure and photocatalytic activity of Bi2O3 were characterized by field-emission scanning electron microscopy X-ray diffraction spectroscopy UV-Vis absorption spectrophotometer and fluorescence spectrophotometer respectively. The morphology and photocatalytic activity of Bi2O3 are relevant to the calcination temperature. Bi2O3 treated at 400 shows the best photocatalytic activity in the degradation of methyl orange 86%. The excellent photocatalytic activity should be attributed to its good light adsorption and low recombination of photo-induced charge carries.

Keywords: Bi2O3 photocatalysis methyl orange


木质生物质热解二级脉冲式气力进料试验研究

吴 煜, 司 慧, 王文亮, 王 霄

(北京林业大学 工学院, 北京 100083

摘要:为解决热解进料气体反喷问题,设计了二级脉冲式气力输送进料试验装置。为确定该装置颗粒质量流量的频率调控方法, 以木质生物质锯末颗粒为物料, 提出并优化了气力进料频率匹配调控方案。在自主设计搭建的试验台上, 考察了A B两级电磁阀的开闭频率对颗粒质量流量的影响。结果表明:减小喷嘴直径,  每周期适当关闭电磁阀A 有利于提高颗粒质量流量, 但关闭时间不宜超过滞留时间(约0.7~0.9 s); 两级电磁阀最佳频率匹配方案为AB闭(0.8~1.2 s)—AB开(0.2~0.5 s)—AB开(0.7~0.9 s)—AB开(0.8~1.0 s);在该方案下落叶松锯末平均颗粒质量流量约为21 g/min

关键词:气力输送; 脉冲式; 锯末; 热解; 频率匹配

中图分类号:TH232    文献标志码:A

文章编号:1008-554820170-0067-06

Study on two-stage feeding using pulse pneumatic conveying system for woody biomass fast pyrolysis

WU Yu SI Hui WANG Wenliang WANG Xiao

School of Technology Beijing Forestry UniversityBeijing 100083 China

Abstract To solve the problem of regurgitation during fast pyrolysis feeding process a two-stage of pulse pneumatic conveying feeding test apparatus was developed. To get the frequency controlling methods of feeding rate a test which adopting woody biomass saw dust as conveying materials was carried out. Based on the test device the frequency matching scheme of pneumatic conveying was put forward and optimized and single factor experiment of the frequency of the two-stage nozzles which is the key factor was carried out. The results show that the mass flow rate can be increased by intermittently closing primary nozzle A no more than residence time which is about 0.7~0.9 s or decreasing the diameter of nozzle. Two-stage frequency optimal matching scheme and matching time of cyclic progress was determined that nozzle A opened and B closed 0.8~1.2 s)—nozzle A opened and B opened0.2~0.5 s)—nozzle A closed and B opened0.7~0.9 s)—nozzle A opened and B opened 0.8~1.0 s. The average larch particle mass flow rate of this equipment under the scheme is about 21 g/min.

Keywords: pneumatic convey pulse larch saw pyrolysis frequency matching


基于EDEM的振动特性对钕铁硼永磁粉体填充密度的影响

刘 波, 马 麟, 刘邱祖, 陆 洋

(太原理工大学 机械工程学院, 山西 太原 030024

摘要:为了提高钕铁硼永磁粉体填充密度, 采用了振动的方法对磁粉颗粒位置进行重排,以减小孔隙率,通过离散元软件EDEM建立了粉体颗粒模型并进行了模拟分析,模拟了在不同振动频率和振动时间下,钕铁硼永磁粉体颗粒的运动状态。结果表明:随振动频率增大,粉体填充密度先增大后减小,在70 Hz时达到最大值;振动时间增加,粉体填充逐渐密实,且振动频率高,填充密度达到最大值用时短,振动频率低,用时长。

关键词:振动频率; 振动时间; 填充密度; 离散元法

中图分类号:TB44    文献标志码:A

文章编号:1008-5548201704-0072-05

ffect of vibration performance on packing density of NdFeB magnet powder based on EDEM

LIU Bo MA Lin LIU Qiuzu LU Yang

College of Mechanical Engineering Taiyuan University of Technology  Taiyuan 030024 Chnia

Abstract In order to improve the packing density of NdFeB magnet powder the particles position were rearranged to decrease the voidage with the method of vibration the model of magnet particles were established and simulated with discrete element software EDEM. The vibrational states of NdFeB magnet powder under different vibration frequency and vibration time were simulated and analyzed. The results show that with the increase of frequency the packing density of powder appears to increase first and then decreasethe density are the highest when the particles vibrate with frequency around 70 Hz. With the increase of time the powder compacts graduallythe packing density reaches the maximum in a shorter time with a higher frequency it reaches the maximum in a longer time with lower frequency.

Keywords: vibrating frequency vibrating time packing density discrete element


粉煤灰分级用旋流器试验研究

张玉龙, 刘培坤, 张悦刊, 杨兴华, 姜兰越

(山东科技大学 机械电子工程学院, 山东 青岛 266590

摘要:针对目前粉煤灰综合利用问题,通过使用直径150 mm旋流器,对粉煤灰进行分级试验研究。通过控制变量的方法,改变旋流器的底流口直径、粉煤灰质量分数和进料压力等参数,得到粉煤灰在底流和溢流中的不同粒度分布,研究各变量对分级性能的影响规律。研究结果表明,随旋流器底流口直径增大,粉煤灰质量分数减小,进料压力增大,得到溢流中粉煤灰的质量分数减小,溢流中小于45 μm颗粒质量分数增大,粉煤灰的分级效率相应提高。当底流口直径为18 mm,粉煤灰的质量分数为15.53%,进料压力为0.04 MPa时,溢流中分离粒度d5043.9 μm,质效率达到64.18%,量效率为88.09%,溢流中小于45 μm粉煤灰质量分数达到90.58%,达到一级粉煤灰标准。

关键词:粉煤灰; 旋流器; 分级试验

中图分类号:X773    文献标志码:A

文章编号:1008-554820170-0077-05

Experimental study on fly ash classification of hydrocyclone

ZHANG Yulong LIU Peikun ZHANG YuekanYANG Xinghua JIANG Lanyue

College of Mechanical and Electronic Engineering Shandong University of Science and Technology Qingdao 266590 China

Abstract Aiming at the problem of comprehensive utilization of fly ash the separation experiments were done using fly ash as the raw material with the diameter of 150 mm hydrocyclone. The underflow diameter feed concentration and feed pressure were studied by controlling variables. Particle size distribution of fly ash were obtained and the influence of different parameters on the performance of the classification were studied. The experimental results show that with the underflow diameter increases the feed concentration decreases the inlet pressure increases the classification performance of fly ash inproved obviously. When the underflow diameter is 18 mm the feed concentration is 15.53% the feeding pressure is 0.04 MPa the d50 of the overflow is 43.9 μm The qualitative reached 64.18% the quantitative efficiencies reached 88.09%. In the overflow the content of -45 μm reached 90.58% and the fly ash reached the standard of the first grade.

Keywords: fly ash hydrocyclone classification test


瓢型摆振槽颗粒偏析效果的离散元模拟

马学东, 陈 强, 李玲玲, 宋 华, 李亚运

(辽宁科技大学 机械工程与自动化学院, 辽宁 鞍山 114051

摘要:为了强化瓢型摆振槽在摆振时物料颗粒的偏析效果,以三维离散元法为手段,选用塑料球和钢球的二元干颗粒,依次对光槽时单独摆振、光槽时组合摆振、添加凸起槽时组合摆振3种情况颗粒偏析过程进行离散元模拟研究,并以颗粒体积分数为评判标准,且结合模拟偏析云图,进行颗粒偏析效果评价。结果表明:组合摆振强于单独摆振的偏析效果;添加凸起槽强于光槽分层效果;相较于光槽时单独摆振,添加凸起槽时组合摆振时颗粒的偏析程度可提高10%15%

关键词:摆振; 颗粒偏析; 离散元法

中图分类号:TD452    文献标志码:A

文章编号:1008-554820170-0082-06

Discrete element simulation of particle layering behavior under combination vibration in scoop shimmy groove

MA Xuedong CHEN QiangLI Lingling SONG Hua LI Yayun

School of Mechanical Engineering & Automation University of Science and Technology LiaoningAnshan 114051 China

Abstract To explore the layering behavior of material particles when swinging vibration the method of three-dimensional discrete element wsa used to simulation the layering process of plastic balls and steel balls under single pendulum on light groovecombined swing on light groove and combined swing on adding embossment groove. The particle segregation effect was evaluated with the particle volume concentration as the evaluation criterion. The results indicate that the layered effect of combined swing vibration is better than that of single swing vibration the layered effect of adding convex groove is better than that of the light groove. And volume concentration of plastic ball particles for the adding convex groove can be improved to 10 %~15 %.

Keywords: swing vibration particles segregation discrete element method


纳米Si粉分散对硅碳负极性能的影响

秦海青, 刘文平, 雷晓旭, 林 峰, 张振军, 张健伟

(中国有色桂林矿产地质研究院有限公司 a. 国家特种矿物材料工程技术研究中心;

b. 广西超硬材料重点实验室, 广西 桂林 541004

摘要:通过高频感应等离子蒸发凝聚法制备得到的纳米Si粉结晶性好,球形度高,表面光滑,比表面积为40.03 m2/g,平均粒径为64.05 nm。以乙二醇和去离子水为分散介质,制备了质量分数10%的纳米Si粉分散液,在乙二醇体系中纳米Si粉颗粒的分散稳定性更好,分散粒径更小,粒度分布为94.17~152.88 nm。以纳米Si粉乙二醇分散液与石墨(G)复合调浆制备的mG: mSi=9:1的复合负极材料电化学性能更优,首次放电比容量为812.5 mA·h/g 可逆充电比容量可达631.0 mA·h/g30次循环后的容量保持率为73.74%

关键词:纳米Si粉; 分散性; 复合负极材料; 电化学性能

中图分类号:TM912    文献标志码:A

文章编号:1008-554820170-0088-06

Effect of dispersion of Si nanopowders to properties of silicon carbon anodes

QIN Haiqing LIU Wenping LEI Xiaoxu LIN Feng ZHANG Zhenjun ZHANG Jianwei

a. National Engineering Research Center for Special Mineral Material b. Guangxi Key Laboratory of Superhard Material China Nonferrous Metal Guilin Geology and Mining Co. Ltd.Guilin 541004 China

Abstract Si nano-powders were prepared by radio frequency inductively coupled plasma evaporation method which were good crystalline and smooth surface spherical powders. Specific surface area and average grain diameter were 40.03 m2/g and 64.05 nm respectively. 10% Si nano-powders dispersion liquid with ethylene glycol and deionized water wsa prepared. It can be found that Si nano-powders in ethylene glycol has better dispersion and smaller particle size than in deionized water particle size distribution is 94.17~152.88 nm. Silicon carbon composite cathode materials  at mG : mSi ratio  have  better  electrochemical performance which are prepared through pulping with 10% Si nano-powers ethylene glycol dispersion and graphite. First discharge capacity is 812.5mA·h/g charge capacity is 631.0 mA·h/g and capacity remain is 73.74% after 30 cycles.

Keywords: Si nano-powders dispersion composite anodes electrochemical properties


硫化钠沉淀法处理含镍废水

赵盈利1 谢洪勇1 陈卫东2

1. 上海第二工业大学 环境与材料学院 上海 201209 2. 华测品标检测上海有限公司 上海 201209

摘要:采用化学沉淀法处理含镍废水,以硫化钠为沉淀剂,将废水中的镍离子以某种含镍沉淀的形式析出,从而达到净化废水的目的,考察硫化钠的投加量、反应速率、搅拌时间和pH值对废水中镍离子的去除率的影响。结果表明,在pH=6.0,硫化钠投加质量为4.0 g,即为理论值的1.1倍时,以30 r/min的转速搅拌反应30 min的条件下,模拟含镍废水的处理效果最佳,去除率达到95.2 %,所得的沉淀物经X射线衍射仪检测显示为氢氧化镍沉淀,中间过程生成的硫化氢气体可继续对废水进行处理。

关键词:硫化钠; 含镍废水; 含镍沉淀

中图分类号:X703.1    文献标志码:A

文章编号:1008-554820170-0094-04

Experimental study on treatment of nickel wastewater with sodium sulfide

ZHAO Yingli 1 XIE Hongyong 1 CHEN Weidong2

1. School of Environmental & Material Engineering Shanghai Polytechnic University Shanghai 201209 China 2. Huace Product Standard Testing Technology Co. Ltd. Shanghai 201209 China

Abstract Sodium sulfide was used in the precipitation treatment of nickel wastewater. The effects of chemicals dosage reaction time and pH value on the removal rate of the nickel ions in the wastewater were investigated. The results show that the excess ratio  of  Na2S  is  1.1  with  stiring  30 min  at  a  rate  of  about 30 r/min the removal rate of nickel is 95.2% XRD analysis showes  a  dense  nickel  hydroxide  precipitate. The  hydrogen sulfide produced during the process can be used to treat the wastewater.

Keywords: sodium sulfide nickel wastewater nickel precipitation


细长型金属管粉体药剂装填中稳定给料模型设计

郑家佳

(重庆城市管理职业学院 工商管理学院, 重庆 401331

摘要:为了解决将粉体药剂装入细长金属管时,一次给料太多则会堵塞料管的问题,实现药剂自动装填过程中给料量的稳定可控,提出采用振动筛的稳定给药方法。通过分析下药质量与振动频率和振幅的关系,建立稳定给料量模型,并进行实验验研究,验证模型的有效性。结果表明,下料量主要与振动筛的振幅、振动频率相关。当振动频率为3 Hz,振幅为20 mm,下药质量的均值在预期目标内,且方差较小,控制效果较好。根据该参数进行下料量控制测试,下药质量误差约为7%,并且浮药少。

关键词:粉体材料; 装填; 细长型金属管; 振动筛

中图分类号:TB44    文献标志码:A

文章编号:1008-554820170-0098-04

Stable feeding model for slim metal tube powder filling

ZHENG Jiajia

School of Business Administration Chongqing City Management College Chongqing 401331 China

Abstract Powder filling is a very difficult process because of the poor fluidity and small size. The blanking tube will be blocked if powders quantity is too much at a time in automatic filling process. To solve this problem a stable filling method based on vibrating screen was put forward. The model can guide and optimize the related parameters settings. The experimental study based on the solving parameters was carried out to verify the effectiveness of the model. The result shows that the amount of particles is mainly related to the amplitude and vibration frequency of the vibrating screen. When the vibration frequency is 3 Hz and the amplitude is 20 mm the mean value of the dose is within the expected target and the control effect is better. According to the parameters of the amount of material control test the error is about 7% and less float.

Keywords: powder filling slim metal pipe vibrating screen

 
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