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    当前位置: 首页 » 精彩新闻 »  《中国粉体技术》2017年第23卷第3期文章摘要
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《中国粉体技术》2017年第23卷第3期文章摘要
作者:管理员  来源:本站原创  发布时间:2017年7月3日  点击次数:433
我国PM1浓度、化学组分及来源的时空分布

何 瑶12 黄汝锦1 王启元1 王浥尘12 曹军骥1

(1. 中国科学院 地球环境研究所; 黄土与第四纪地质国家重点实验室;中国科学院气溶胶化学与物理重点实验室, 陕西 西安 710061 2. 中国科学院大学 资源与环境学院, 北京 100049

摘要:总结我国京津冀、长三角和珠三角地区不同季节基于气溶胶质谱仪的外场观测研究,探讨我国非难熔性亚微米气溶胶 NR-PM1 化学组分和来源的时空变化特征。结果表明,3个地区NR-PM1质量浓度变化范围为15.3~90.5 μg/m3,京津冀浓度最高,珠三角最低;3个地区中有机物均为NR-PM1的主要组分,占24%~58%;珠三角地区硫酸盐含量更高,硝酸盐含量低;各地区秋冬季NR-PM1质量浓度高于春夏季,主要是由于燃烧排放的一次有机物 BBOACCOA 与无机物 (氯化物)增多造成;对有机物源解析的统计发现,机动车源 HOA 与二次源 SOA 在各地区站点中广泛存在,而烹饪源 COA 则一般存在于城市站点;生物质燃烧源 BBOA 在长三角、珠三角地区更为广泛,燃煤源 CCOA 主要存在于京津冀地区。

关键词:NR-PM1 源解析; 时空分布

中图分类号:P402   文献标志码:A

文章编号:1008-5548201703-0001-10

Temporal and spatial distribution of atmospheric PM1 concentration composition and source in China

HE Yao12 HUANG Rujin1 WANG Qiyuan1WANG Yichen12 CAO Junji1

 1.  Key Laboratory of Aerosol Chemistry and Physics State Key Laboratory of Loess and Quaterbary Geology  Institute of Earth Environment Chinese Academy of Science  Xian 710061 China 2. College of resources and environment University of Chinese Academy of Sciences Beijing 100049 China

Abstract Field observations based on aerosol mass spectrometers in Beijing-Tianjin-Hebei region Yangtze River Delta and Pearl River Delta s were summarized in this study and the temporal and spatial variation of chemical composition and source of submicron aerosols was discussed. The results show that the average mass concentration of NR-PM1 in the three regions range between 15.3 and 67.9 μg/m3 the highest is in Beijing-Tianjin-Hebei region and the lowest is in Pearl River Delta. Organic aerosol is the major component of NR-PM1 in each region accounting for 24%~58%. In the Pearl River Delta the mass fraction of sulfate is significantly higher than that in the other two regions and that of nitrate is significantly lower. In general the concentrations of NR-PM1 in autumn and winter are higher than those in spring and summer mainly due to the increase of organic BBOA CCOA and inorganic chlorinated components from combustion emissions. It is also found that HOA and SOA are widespread in all sites of the three regions while COA is generally found in urban sites. BBOA is widely distributed in Yangtze River Delta and Pearl River Delta CCOA however only existed in Beijing-Tianjin-Hebei region.

Keywords: NR-PM1 source appointment temporal and spatial distribution

 

离散元法在绝缘子动态积污分析中的应用

王国志, 孙海振, 吴文海,

(西南交通大学 机械工程学院, 四川 成都 610031

摘要:为研究外界因素对绝缘子表面的动态积污的影响,以ZS-35KV/6-8瓷棒形支柱绝缘子为研究对象,利用DEM-CFD耦合方法模拟绝缘子表面动态积污过程,使用离散元法综合分析粒径、风速大小、来流角度对积污的影响。结果表明:一定时间内,绝缘子的表面积污率表面粘附的污秽颗粒数呈线性增长趋势;随着风速的增大,颗粒粘附速率先增大,然后逐渐减少,粘附速率最大时对应的风速为最适合积污风速,最适积污风速随粒径的增大近似呈对数分布;当来流角度为135°左右时,颗粒粘附速率最大;绝缘子上表面积污受曳力影响较大,下表面积污受重力沉降作用影响较大,上表面污秽颗粒平均粒径比下表面污秽颗粒平均粒径较小。

关键词:绝缘子; 动态积污; DEM-CFD耦合方法; 颗粒粘附速率

中图分类号:TM852     文献标志码:A

文章编号:1008-5548201703-0011-05

Application of discrete element method in analysis of dynamic contamination of insulators

WANG Guozhi SUN Haizhen WU Wenhai KE Jian

 School of Mechanical EngineeringSouthwest Jiaotong University Chengdu 610031China

AbstractIn order to study the influence of external factors on the insulator dynamic contamination the contamination process of ZS-35KV/6-8 solid core post insulator were studied using coupled methods of DEM and CFD the effects of particle diameter wind speed coming angle of wind on contamination were investigated using discrete element method. The results show that in a certain period of time the polluting area rate and the number of dirty particles adhered to the surface shows a linear increasing trend. The particle adhesion rate increases initially and then decreases gradually with the increase of wind speed. When the adhesion rate reaches the maximum it has the optimum wind speed for pollution which showes a logarithmic distribution with the increase of particle diameter. When the coming angle is about 135 °, the pollution is the fastest. The contamination of upper surface is mainly influenced by free stream drag and the contamination of lower surface is affected by gravity sedimentation most then the average diameter of particles on the upper surface is smaller than that of  particles on the lower surface. 

Keywords: insulator dynamic contamination DEM-CFD  method coupling method particle adhesion rate

 

陶瓷基复合相变储热材料的制备和成型工艺

张叶龙1 许 永1 赵伟杰1 王 敏1 翁立奎1 冷光辉2 丁玉龙2

(1. 南京金合能源材料有限公司, 江苏 南京 210047 2. 英国伯明翰大学, 伯明翰 B15 2TT

摘要:采用混合烧结法工艺,将三元氯盐体系NaCl-KCl-MgCl2相变材料与氧化镁陶瓷基体进行复配并制备定型材料, 考察成型压力、 烧成温度和盐含量对材料成型的影响, 对最佳成型条件的材料进行储热性能表征。 结果表明: 当盐的质量分数为50 %、烧成温度为450 ℃、成型压力为8 MPa时复合材料成型效果较好,相变材料无渗出、体积变化较小且复合材料致密度较高;DSC测试结果表明,所制备的复合相变储热材料的相变温度为399.8 ℃,相变潜热为129.6 J/g

关键词:相变储热材料; 陶瓷基体; 成型工艺

中图分类号:TK02     文献标志码:A

文章编号:1008-5548201703-0016-05

Preparation and molding process of ceramic matrix composite phase change heat storage material

ZHANG Yelong1 XU Yong1 ZHAO Weijie1 WANG Min1 WENG Likui1 LENG Guanghui2 DING Yulong2

 1. Nanjing Jinhe Energy Material Co. Ltd.Nanjing 210047 China 2. University of Birmingham Birmingham  B15 2TT UK

Abstract The mixed sintering method was used to shape the ternary chlorine salt system NaCl-KCl-MgCl2 with magnesium oxide ceramic matrix. The influence of pressing pressure sintering temperature and salt content on the material molding were studied and the heat storage performance was tested. The experimental results show that when the preparation conditions are the 50 % salt content sintering temperature of 450 and 8 MPa pressing pressure the preparation effect is better. At that time the phase change material is no seepage the composite material has a smaller volume change and a higher density. The DSC test results show that the phase transition temperature of composite phase change heat storage material is 399.8 ℃, and the phase change latent heat is 129.6 J/g.

Keywords: phase change material ceramic matrix molding process

 

磁控溅射金刚石微粉表面镀镍及其在电镀金刚石线锯上的应用

张一翔, 沈志刚

(北京航空航天大学 粉体技术研究开发北京市重点实验室; 航空科学与工程学院, 北京 100191

摘要:为了增强电镀金刚石线锯对金刚石颗粒的把持力,提高金刚石线锯寿命,使金刚石颗粒与电镀金属更好地结合,通过振动辅助的摇摆式样品台将金刚石微粉充分分散,使用磁控溅射方法在粒径为30~40 μm的金刚石微粉表面镀附金属镍,利用其制备电镀金刚石线锯,借助光学显微镜(OM)、扫描电子显微镜(SEM)、能量色散X射线光谱仪(EDX)对制备的镀镍金刚石颗粒和电镀金刚石线锯进行形貌和成分表征,研究不同溅射和电镀条件对实验结果的影响; 通过自制切割实验装置对比金属化前后的金刚石微粉制备的金刚石线锯对金刚石的把持力。结果表明:磁控溅射表面镀镍能增强电镀金属与金刚石表面的结合,切割试验后金刚石脱落量相比原始金刚石明显从17.4%减少到4.9%

关键词:金刚石微粉; 金刚石线锯; 磁控溅射; 表面金属化; 颗粒把持力

中图分类号:TB44     文献标志码:A

文章编号:1008-5548201703-0021-05

Ni coating on surface of diamond microparticles by magnetron sputtering method for enhanced performance of diamond wire

ZHANG Yixiang SHEN Zhigang

 Beijing Key Laboratory for Powder Technology Research and Development School of Aeronautic Science and EngineeringBeihang University Beijing 100191 China

Abstract In order to improve the abrasive retentively of electroplated diamond wire and increase its durability diamond microparticles were coated with Ni by magnetron sputtering method to enhance the binding between diamond and electroplated metal. With a swing sample vessel assisted by vibration generator diamond microparticles 30~40 μm were fully dispersed to be deposited with Ni before affixed to diamond wire. Surface characterization and composition of the Ni-coated diamond microparticles and electroplated diamond wires were conducted by OM SEM and EDX. Influences of different experimental conditions during sputtering and electroplating were evaluated. Contrast cutting experiments were carried out to study the abrasive retentivity. The results show that diamond microparticles with magnetron sputtering Ni coating possess stronger interface with electroplated metal. Contrast cutting experiments show diamonds with Ni coating suffer much less diamond loss 4.9% compared to those without coating 17.4%.

Keywords: diamond microparticles diamond wire magnetron sputtering surface metallization abrasive retentivity

 

雾化法磁性磨料的磁力光整加工

周成柱, 赵玉刚, 代继义

(山东理工大学 机械工程学院, 山东 淄博 255049

摘要:利用雾化法制备的磁性磨料,通过自行研制的微型数控研磨机床,以S136模具钢为工件,进行磁力光整加工实验,考查主轴转速、磁性磨料粒度、磁场强度等因素对磁力光整加工中工件的表面粗糙度的影响。结果表明,主轴转速为900 r/min,磁性磨料粒径在104150 μm,磁场强度为0.9 T时,磁力光整加工中工件的表面质量最佳。

关键词:雾化法磁性磨料; 微型数控研磨机床; 磁力光整加工;表面粗糙度

中图分类号:TG580.68     文献标志码:A

文章编号:1008-5548201703-0026-04

Magnetic abrasive finishing with magnetic abrasive by gas atomization method

ZHOU ChengzhuZHAO YugangDAI Jiyi

 School of Mechanical Engineering Shandong University of Technology Zibo 255049 China

Abstract   In order to experimentally research magnetic abrasive finishing with magnetic abrasive by gas atomization method S136 die steel was finished on self-designed micro numerical control finishing machine. Experiments were carried out to research the effect of various factors such as spindle speed particle size of magnetic abrasive and magnetic field intensity on workpiece surface roughness. The results indicate that the best parameters are 900 r/min of spindle speed grain size range from 104 to 150 μm of magnetic abrasive and 0.9 T of magnetic field intensity.

Keywords: gas atomization magnetic abrasive micro numerical control finishing machine magnetic abrasive finishing surface roughness

 

干燥方式对白炭黑性能的影响

陈鹏宇, 程 娜, 宓淑莹, 周梅芳, 姜海波, 李春忠

(华东理工大学 超细材料制备与应用教育部重点实验室, 上海 200237

摘要:利用冷冻、喷雾、真空、烘箱干燥等4种干燥方式对对湿法研磨后的白炭黑浆料进行处理,研究干燥方式对白炭黑粒径、吸油值、比表面积和微观形貌等理化性能的影响。结果表明:研磨干燥后的白炭黑,中位径d509.6 μm减小到110 nm以下,吸油值(DBP)与比表面积(BET)均小于研磨前;冷冻干燥样品的中位径d50减小为73 nm,吸油值(2.15 mL/g)以及比表面积(144 m2/g)与原样最为接近。

关键词:白炭黑; 湿法研磨; 干燥方式; 粒径

中图分类号:TQ330.38     文献标志码:A

文章编号:1008-5548201703-0030-04

Influence of drying methods on properties of silica

CHEN Pengyu CHENG Na MI Shuying ZHOU Meifang JIANG Haibo LI Chunzhong

 Key Laboratory for Ultrafine Materials of Ministry of Education East China University of Science and Technology Shanghai 200237

Abstract Silica slurry obtained by wet grinding was dried by four drying methods such as freeze drying spray drying vacuum drying and oven drying. The influence of drying methods on the physical and chemical properties of silica after grinding was studied by the test of particle diameter oil absorption value DBP value), specific surface area BET value and microstructure. The results show that silicas median particle diameterd50 drops from 9.6 μm to 110 nm and its DBP value and BET value are lower than the pristine silica. The median particle diameter of silica after freeze drying drops to 73 nm while its DBP value 2.15 mL/g and BET value 144 m2/g are nearest to pristine silica.

Keywords: silica wet grinding drying methods particle diameter

 

球磨法制备高活性铝粉

王路路1 邓国栋1 殷求实1 何那仁朝格图1 李 铎2 李 强2

(1. 南京理工大学 国家特种超细粉体工程技术研究中心, 江苏 南京 2100942. 山西北方兴安化学工业公司, 山西 太原 030008

摘要:为提高含铝炸药爆热性能,探索高活性金属铝粉的制备方法,采用立式球磨机对球形铝粉进行处理,研究球磨机的搅拌转速、球磨时间、助磨剂的配比对活性铝粉粒径、形貌、热性能的影响;利用扫描电子显微镜、激光粒度测试仪和同步热分析仪检测活性铝粉形貌、粒径及热分解特性;采用热分析参数法测定活性铝含量。结果表明:制备活性铝粉的最佳条件为搅拌转速1 100 r/min,研磨时间4 h,助磨剂占铝粉质量比4%;制备的活性铝粉粒径d501.108 μm,片状,活性铝质量分数由90.42%增加到98.42%;用于含铝炸药中,爆热值由6 805 kJ/kg增加到7 642 kJ/kg

关键词:球形铝粉; 活性铝含量; 球磨粉碎; 爆热; 热分解性能

中图分类号:TQ56-0     文献标志码:A

文章编号:1008-5548201703-0034-05

Preparation of high-activated aluminum powder by ball milling method

WANG Lulu1 DENG Guodong1YIN Qiushi1 HE Narenchaogetu1 LI Duo2 LI Qiag2

 1. National Special Superfine Powder Engineering Center  Nanjing University of Science and TechnologyNanjing 210094 China 2. Shanxi North Xing'an Chemical  Industry Company Taiyuan 030008 China

Abstract To improve the aluminized explosive detonation heat performanceexplore preparation method of high-activated aluminum powder spherical aluminum powders were processed with a ball mill and the effects of agitation speed grinding time and grinding aid ratio on particle size morphology and thermal properties of activated aluminum powder were studied. The morphology particle size and thermal decomposition of activated aluminum powder were characterized by scanning electron microscopy laser particle size tester and synchronous thermal analyzer. Active aluminum content was determined by thermal analysis parameter method. Experimental results show that the best conditions to prepare active aluminum powder are stirring speed of 1 100 r/min grinding time of 4 h grinding aid ratio of 4%. Under these conditions the particle size d50 of the aluminum powder after grinding is 1.108 μm and the active aluminum content of active aluminum powder is increased from 90.42% to 98.42%. In aluminized explosive detonation heat value is increased from 6 805 to 7 642 kJ/kg.

Keywords: spherical aluminum powder content of active aluminum ball milling detonation heat thermal decomposition performance

 

非规则外形内聚颗粒模型的构建及其破碎能分析

李 臣, 姜志宏, 郭 晋, 郭进山

(江西理工大学 机电工程学院, 江西 赣州 341000

摘要:考虑矿石的非规则外形、内部不同组分及其之间的力学特性,基于离散元数值分析方法、离散元软件EDEM及其二次开发,构建一种多尺度非规则外形内聚颗粒模型;利用颗粒模型在剪切挤压破碎机中对矿石破碎过程的破碎能耗特性进行分析。结果表明,破碎能与剪切挤压破碎机的加载方式有密切关系,在内锥振动频率一定时,外锥的转速越快,破碎能越大;外锥转速一定时,内锥振动频率越高,破碎能越大;矿石破碎越多,破碎能越大;矿石破碎速度越大,破碎能增长越快; 矿石破碎速度减少,破碎能随之减小。

关键词:离散元; 矿石破碎; 二次开发; 颗粒模型; 破碎能

中图分类号:TU43     文献标志码:A

文章编号:1008-5548201703-0039-06

Construction of irregular shape cohesive particle model and its crushing energy analysis LI Chen JIANG Zhihong GUO Jin GUO Jinshan

 School of Mechanical and Electrical Engineering Jiangxi University of Science and Technology Ganzhou 341000 China

Abstract Considering the mineral irregular shape mineral inside different components and mechanical properties among different components a multi-scale irregular shape cohesive particle model was built with discrete element numerical analysis method the discrete element software EDEM and its secondary-development. Using the particle model the energy consumption characteristics of shear extrusion crushing process in crusher were analyzed. The results show that the crushing energy is closely related to the loading mode of shearing extrusion crusher. When the inner cones vibration frequency is constant the crushing energy is larger with the outer cones rotational speed becoming faster. When the outer cones rotational speed is constant the crushing energy is larger with the inner cones vibration frequency becoming higher. The more minerals are broken the greater the crushing energy is and the greater the mineral crushing rate is the faster the crushing energy grows. While the mineral crushing rate is reduced the crushing energy decreases.

Keywords: discrete element mineral crushing secondary-development particle model crushing energy

 

液相剥离法制备石墨烯研究进展

田 杰, 郭 丽, 沈 嵩, 张 毅, 尹翔鹭, 毋 伟

(北京化工大学 教育部超重力工程研究中心, 北京 100029

摘要:对石墨剥离体系的选择原则,石墨在有机溶剂体系、含水表面活性剂、离子液体体系中的剥离,球磨机、高压射流机、超声波发生器、高速搅拌剪切机、超临界装置、超重力旋转床等石墨的剥离设备进行综述;认为提出液相剥离法制备的石墨烯应用前景良好;液相剥离法还存在浓度低、层数和尺寸的多分散性、剥离介质价格昂贵或沸点高、辅助剂不易分离等不足;液相剥离法规模制备石墨烯面临的挑战主要是选择和设计合适的剥离体系和剥离设备。

关键词:石墨烯; 液相剥离; 体系; 设备

中图分类号:TQ 127.1+1     文献标志码:A

文章编号:1008-5548201703-0045-05

Research progress on preparation of graphene by liquid exfoliation method

TIAN Jie GUO Li SHEN SongZHANG Yi YIN Xianglu WU Wei

 High Gravity Engineering Research Center of Ministry of Education  Beijing University of Chemical Technology Beijing 100029 China

Abstract The selection principle of the graphite stripping system the graphene stripping systems including the organic solvent system the aqueous surfactant system and the ionic liquid system and the stripping equipments such as the ball mill the high pressure jet machine the ultrasonic generator the high speed mixing shear the supercritical device and the high-gravity rotating bed were reviewed. It is considered that the method of liquid-phase exfoliation is the most promising preparation method because of its low cost simplicity high yield and latent industrial expansibility. There are many shortcomings such as low concentration the polydispersity of layer and size expensive or high boil of stripping medium difficult separation of auxiliary agent. The major challenge in preparing graphene is the selection and design of suitable stripping system and equipment.

Keywords: graphene liquid-exfoliation system equipment

 

机械力化学法制备滑石-TiO2复合粉体的颜料性能

敖卫华, 丁 浩, 沈 凯

(中国地质大学( 北京) 材料科学与工程学院, 北京 100083

摘要:采用机械力化学法,在水介质中采用滑石研磨和滑石与TiO2共混研磨方式制备滑石-TiO2复合粉体,探讨影响复合粉体颜料性能的工艺因素,表征复合粉体的颜料性能与显微结构。结果表明:滑石的颗粒粒径随研磨强度的增加呈先减小后增大、再逐渐趋于稳定的规律,可满足与TiO2复合的基体要求;滑石-TiO2复合粉体表面滑石颗粒紧密包覆TiO2颗粒层,具有与钛白粉相似的颜料性能;TiO2质量分数为70%的滑石-TiO2复合粉体的遮盖力为10.45 g/m2TiO2质量分数为66%的复合粉体的遮盖力为12.50 g/m22种复合粉体的遮盖力分别达到金红石型TiO2105.26%88%;滑石-TiO2复合粉体紫外线屏蔽性能与金红石钛白粉相当。

关键词:滑石; 二氧化钛; 复合粉体; 颜料性能

中图分类号:TU599     文献标志码:A

文章编号:1008-5548201703-0050-07

Preparation of Talc-TiO2 composite particles by mechano-chemical method and its pigment performance

AO Weihua DING Hao SHEN Kai

 School of Materials Science and Technology China University of Geosciences Beijing), Beijing 100083 China

Abstract In water medium talc-TiO2 composite particles were made with mechano-chemical method by ways of talcin grinding and mixed grinding of the talc and TiO2. The factors on preparing process of the talc-TiO2 composite particles were studied and the structure and pigment properties of it were characterized. The results show that with the mechanical energy gained on the surface of talc particles the particle size of it decreases firstly then increases and decreases slightly at last which meets the composite requirements with TiO2.  TiO2 particles tightly coates talc particles surface and the composite particles has a similar pigment properties like titanium dioxide. Talc-TiO2 composite powders  contained 70% rutile TiO2 have the hiding power of 10.45 g/m2 and the ones contained 66% have the hiding power of 12.50 g/m2. Tiding power rates of the  two kinds of composite powders are 105.26% and 88% respectively of rutile TiO2 and the ultraviolet absorption capacity of composite powders are the same as titanium dioxide.

Keywords: talc titanium dioxide composite particles pigment property

 

粉体粘球对卧式行星磨粉磨重质碳酸钙的影响

许秉坤, 叶旭初, 钱旭东, 陆 周

(南京工业大学 材料科学与工程学院, 江苏 南京 210009

摘要:采用小型卧式行星磨粉磨重质碳酸钙,研究粉体粘球程度随粉磨时间的变化规律以及粉体粘球对粉磨过程的影响。结果表明:重钙粉体粘球时间在7 min时达到动态平衡;粘球后,达到粉磨极限的时间由5 min延长到7 min;小于10 μm的成粉率从72.61%减少到66.67%;重钙的粉磨极限没有改变,极限粒径稳定在d0.5)在3 ~4 μm之间。

关键词:卧式行星磨; 重质碳酸钙; 粉磨极限

中图分类号:TD453TB44     文献标志码:A

文章编号:1008-5548201703-0057-05

Effect of powder wrapping ball on ground calcium carbonate grinding in horizontal planetary ball Mill

XU Bingkun YE Xuchu QIAN Xudong LU Zhou

 College of Materials Science and Engineering Nanjing Tech University Nanjing 210009 China

Abstract A self-designed horizontal planetary ball mill was used to grind ground calcium carbonate. The evolution of the degree of the powder wrapping the ball versus grinding time and the effect of the powder wrapping the ball on the grinding process were studied. The results show that the ground calcuim carbonate powder wrapping the ball reaches the dynamic equilibrium in about 7 min. After powder wrapping the ball the time to reach the grinding limit increases from 5 to 7 min powder forming rate of less than 10 μm decreases from 72.61% to 66.67% while the grinding limit of the ground calcium carbonate does not change. The limit d0.5 is between 3 and 4 μm.

Keywords: horizontal planetary ball mill ground calcium carbonate grinding limit

 

离散-连续混合多尺度模型在计算流体力学中的应用进展

陈锡忠12 王军武1

1. 中国科学院 过程工程研究所; 多相复杂系统国家重点实验室, 北京 100190 2. 爱丁堡大学, 英国 EH11 1UT

摘要:综述离散-连续混合多尺度模型在计算流体力学中的应用研究进展,介绍混合多尺度模型的研究意义、建立方法及发展进程;重点评述混合直接蒙特卡洛方法及纳维叶-斯托克斯方程的方法在稀薄气体流动研究中的进展和混合分子动力学方法及纳维叶-斯托克斯方程的方法在纳微液体流动研究中的进展;简单介绍其他混合多尺度方法;总结混合多尺度模型的优缺点并展望其未来研究方向。

关键词:离散-连续耦合; 原子-连续混合; 混合多尺度模型; 多尺度耦合; 跨尺度关联

中图分类号:O351   文献标志码:A

文章编号:1008-5548201703-0062-11

Review of discrete-continuum hybrid multi-scale model for computational fluid dynamics

CHEN Xizhong12 WANG Junwu2

1. State Key Laboratory of Multiphase Complex SystemsInstitute of Process Engineering Chinese Academy of Sciences Beijing 100190 China 2. University of Edinburgh Edinburgh EH11 1UT United Kingdom

Abstract This work reviewed the advance of the discrete-continuum hybrid multi-scale model for computational fluid mechanics. The significance setup procedure and development progress of hybrid multi-scale model are further introduced. In the second part the hybrid DSMC-NS method for rarefied gas flow and the hybrid MD-NS method for nano-and micro- fluid flows were reviewed. The merits and drawbacks of hybrid multi-scale model were summarized and the possible future research focuses were also highlighted.

Keywords: discrete-continuum  coupling  hybrid  atomistic-

continuum hybrid multi-scale model multi-scale couplingtran-scale correlation

 

催化裂化密闭快分系统封闭罩内流场优化

李建涛, 李 智, 卢春喜

(中国石油大学(北京) 化学工程学院; 重质油国家重点实验室, 北京 102249

摘要:针对催化裂化密闭快分(CVQS)系统封闭罩内上方存在的非对称不稳定的旋涡流引起的压力不稳定现象,在一套大型冷模装置上,实验测定旋涡流出现的位置与操作条件间的时空特性;为消除不稳定旋涡流,在封闭罩内添加直板形式的导流板,与不添加导流板的装置进行实验对比。结果表明,装置加入合适导流板后,封闭罩内的流场得到改善,有效消除旋涡流现象,减弱了压力波动,使系统的压降明显减小。

关键词:催化裂化; 密闭快分系统; 导流板; 压力脉动

中图分类号:TQ051.1     文献标志码:A

文章编号:1008-5548201703-0073-08

Optimization of flow field in closing cylinder of circulation stripping vortex quick separator system

LI Jiantao LI Zhi LU Chunxi

 State Key Laboratory of Heavy Oil Processing Institute of Chemical Engineering China University of Petroleum Beijing), Beijing 102249 China

Abstract In order to study the unstable pressure in closing cylinder of circulation stripping vortex quick separator system because of the asymmetric vortex flow an experiment was performed to measure the characteristics of time and space between the position of the vortex flow and the operating conditions of the experiment. The guide plate was installed in order to eliminate the unstable vortex flow in closing cylinder of circulation stripping vortex quick separator system. The results show that the flow field in closing cylinder of circulation stripping vortex quick separator system is optimized as the guide plate is installed. On the basis of comparing the experimental data of different structure the following conclusion can be drawn that the pressure in closing cylinder becomes stable as the vortex flow in closing cylinder is eliminated and the pressure drop in the system is reduced significantly.

Keywords: catalytic cracking circulation stripping vortex quick separator guide plate pressure fluctuation

 

加压循环流化床气固流动特性冷态试验

刘志成1 李 鹏12 朱治平1

(1. 中国科学院 工程热物理研究所, 北京 100190 2. 中国科学院大学 物理学院, 北京 100049

要:利用提升管直径为300 mm 高度为8 00 mm的加压循环流化床冷态试验台, 以平均粒径为0.347 mm 堆积密度为1 435 kg/m3的石英砂为床料,考查不同压力(0.10.5 MPa)、不同返料器、提升管顶部凸头结构对提升管内气固流动特性的影响。结果表明:加压条件下,提升管内的表观颗粒体积分数呈上小下大分布,随表观气速的增加逐渐趋于均匀分布;床料量和表观气速一定的情况下,增加压力可显著增大提升管上部的表观颗粒体积分数;采用Φ150和Φ200返料器均可建立正常的物料循环过程,改变返料器的直径并未改变提升管内的表观颗粒体积分数分布;提升管顶部采用凸头结构可增大提升管顶部的表观颗粒体积分数。

关键词:加压煤气化; 加压循环流化床; 冷态试验台; 表观颗粒体积分数

中图分类号:TK222     文献标志码:A

文章编号:1008-5548201703-0081-05

Cold-model experiment on air-solid flow in pressurized circulating fluidized bed

LIU Zhicheng1 LI Peng12 ZHU Zhiping1  1. Institute of Engineering Thermophysics

Chinese Academy of Sciences Beijing 100190 China  2. Department of Physics University of Chinese Academy of Sciences Beijing 100049 China

Abstract The flow behaviors of silica sand with the mean diameter of 0.347 mm and the bulk density of 1 435 kg/m3 in the riser were investigated with different loop seals and different exits of the riser at pressure from 0.1 to 0.5 MPa on a cold-model experimental facility of pressurized circulating fluidized bed with the riser diameter of 300 mm and the height of 8 700 mm. The results show that at the elevated pressurethe apparent solid holdup is lower at the upper part and higher at the bottom part of the riser the apparent solid holdup tend to an uniform distribution with the increase of the superficial air velocity. When the bed inventory and superficial air velocity are kept unchanged the solid holdup at the upper part of the riser increases with the elevated pressure. Normal circulation process can be established with both the loop seals with the diameters of 150 mm and 200 mmthe solid holdup distribution in the riser can not be changed with the diameter variation of the loop seals. The apparent solid holdup at the top of the riser can be increased with an abrupt exit of the riser.

Keywords: pressurized coal gasification pressurized circulating fluidized bed cold-model experimental facility  apparent solid holdup

 

应用于自适应动态光散射技术的通用型测量方案

陈 淼, 邱 健, 骆开庆, 彭 力, 韩 鹏

(华南师范大学 物理与电信工程学院; 广东省光电检测仪器工程技术研究中心, 广东 广州 510006

摘要:利用不同的测量方案测量6种粒径的纳米颗粒平均粒径和分散度poly等,确定一组应用于自适应动态光散射技术的通用型测量方案。结果表明:对于广泛范围粒径的纳米颗粒,使用该通用性测量方案可以获得准确的粒径信息;通用性测量方案在自适应测量过程中不可或缺,同时可以确保自适应测量方案选择的正确性。

关键词:动态光散射; 自适应测量; 通用型测量方案

中图分类号:O436.2   文献标志码:A

文章编号:1008-5548201703-0086-05

Universal measurement scheme applied to self-adaptive dynamic light scattering technique

CHEN Miao QIU Jian LUO Kaiqing PENG Li HAN Peng

School of Physics and Telecommunication Engineering Guangdong Provincial Engineering Research Center For Optoelectronic Instrument South China Normal University Guangzhou 510006 China

Abstract A set of universal measurement scheme was analyzed and confirmed through the average particle size and diffusion coefficient of the six different nanoparticles that were measured using different measurement scheme. The results show that for a wide range of nanoparticles the accurate particle size information is obtained by using the universal measurement scheme and the universal measurement scheme is an indispensable part of the self-adaptive measurement technique and ensures the correctness of the choice of the adaptive measurement scheme.

Keywords: dynamic light scattering self-adaptive measurement universal measurement scheme

 

球磨仪研磨硫磺粉的静电作用

付 瑜1 吕强强2 吕 娟1 杨燕霞1 陈海焱1 张明星1

(1. 西南科技大学 环境与资源学院, 四川 绵阳 621010 2. 河南理工大学 安全科学与工程学院, 河南 焦作 454000

摘要: 采用高频振动球磨仪研磨硫磺, 对研磨过程中硫磺粉的起电特性进行测试和分析。结果表明:控制研磨转速分别为1 200 1 500 1 800 r/min时,薄片状硫磺带静电量到达饱和值的时间为40 60 100 s,荷质比增大速率为0.269 0.470 0.700 nC/g·s),粉状硫磺所带静电量到达饱和值的时间分别为304070 s,荷质比增大速率为0.416 0.701 0.979 nC/g·s);采用碳化钨材质的研磨体,研磨后的硫磺粉所带静电量最小,不锈钢研磨材质的是碳化钨的1.39倍,氧化锆研磨材质的是碳化钨的3.82倍;增大硫磺粉的湿基含水量能够有效减小研磨过程中硫磺粉所带的静电量,当湿基含水量为0.8%时,研磨硫磺粉的饱和静电量几乎减小为0

关键词:硫磺; 荷质比; 研磨材质; 湿基含水量

中图分类号:TQ110.6     文献标志码:A

文章编号:1008-5548201703-0091-05

Electrostatic effect of sulfur powder grinding by ball mill

FU Yu1 LYU Qiangqiang2 LYU Juan1 YANG Yanxia1 CHEN Haiyan1 ZHANG Mingxing1

 1. School of Environment and Resource Southwest University of Science and Technology Mianyang 621010China 2.College of Safety Science and Engineering Henan Polytechnic University Jiaozuo 454000China

Abstract The electrical characteristics characteristics of sulfur powder in the grinding process were tested and analyzed by employing small-sized ball grinder of high-frequency vibration to grind the sulfur. The results show that when the grinding speed is controlled at 1 200 1 500 and 1 800 r/min respectively the time for the static electricity amount of sulfur flake to become saturation value is 40 60 and 100 s with the rising ratio of charge-to-mass ratio being 0.269 0.470 and 0.700 nC/g·s. The time for the static electricity amount of powder sulfur to become saturation value is 30 40 and 70 s with the rising ratio of charge-to-mass ratio being 0.416 0.701 and 0.979 nC/g·s. The amount of static electricity of sulfur powder ground by grinding media made from tungsten carbide is the lowest. The static electricity caused by stainless steel material is 1.39 times that by tungsten carbide. The static electricity caused by zirconia is 3.82 times that by tungsten carbide. The augmented wet-basis water content of sulfur powder can effectively reduce the static electricity amount on sulfur powder in the process of grinding. When the wet-basis water content is 0.8% the saturated static electricity amount when the sulfur powder is ground is reduced to as low as nearly 0.

Keywords: sulfur charge-to-mass ration material for grinding wet-basis water content

 

亚微米-微米级粒径的国家标准物质研制

胡向军, 刘俊杰, 张文阁

(中国计量科学研究院, 北京 100029

摘要:对6种编号分别为GBWE120128~GBWE120133 标称值分别为0.6510152550 μm的国家二级粒径标准物质,采用不同聚合技术制备得到单分散标准物质候选物,采用扫描电子显微镜对平均粒径进行定值,结果可溯源至国家长度标准。结果表明:标准物质的均匀性、稳定性良好,可广泛应用于亚微米-微米级微粒粒径分析仪的校准与计量检定。

关键词:亚微米; 微米; 粒度; 标准物质

中图分类号:TB92   文献标志码:A

文章编号:1008-5548201703-0096-04

Development of national primary reference materials as submicron -micron scale particle size standard

HU Xiangjun LIU Junjie ZHANG Wenge

 National Institute of Metrology  Beijing 100029 China

Abstract Six kinds of particle size certified reference materials with nominal values of 0.6 5 10 15 25 50 μm coded with GBWE120128~GBWE120133 were been developed. The candidate monodisperse materials of CRMs were prepared by different polymerization techniques and the average particle size was determined by scanning electron microscope. The results show that the developed CRMs have good homogeneity and can be widely used in the particle size analyzer calibration.

Keywords: submicrometer micrometer particle size certified reference materials

 

燃煤锅炉灰渣中可燃碳含量的分析方法

曹 勇12 夏红德1 周 托1 魏 凯1

(1. 中国科学院 工程热物理研究所, 北京 100190 2. 中国科学院大学 物理学院, 北京 100049

摘要:采用工业分析法、元素分析法和热重质谱联用加等效特征图谱法,对循环流化床锅炉的飞灰及炉渣中可燃碳含量进行分析。结果表明:工业分析法和元素分析法无法完全排除水分、消石灰、碳酸盐和硫酸盐等物质的影响,热重质谱联用加等效特征图谱法可排除水分、消石灰、碳酸盐和硫酸盐等物质的影响,可精确测量飞灰及炉渣中可燃碳含量。

关键词:热重质谱联用加等效特征图谱法; 可燃碳含量; 工业分析法; 元素分析法

中图分类号:TK16     文献标志码:A

文章编号:1008-5548201703-0100-06

Accurate measurement for unburned carbon in fly ash and slag from coal boilers

CAO Yong1 2 XIA Hongde1 ZHOU Tuo1 WEI Kai1

 1. Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing 100190 China 2. School of Physics University of Chinese Academy of Sciences Beijing 100049 China

Abstract Proximate analysis ultimate analysis and thermogravimetry-mass spectrometry with equivalent characteristic spectrum analysis were used to measure the unburned carbon in fly ash and slag. The results show that the influence of water hydrated lime carbonate and sulfate are not completely ruled out by proximate analysis and ultimate analysis while the influence of water hydrated lime carbonate and sulfate are ruled out by thermogravimetry-mass spectrometry with equivalent characteristic spectrum analysis which can accurately measure the unburned carbon in fly ash and slag.

Keywords: thermogravimetry-mass spectrometry with equivalent characteristic spectrum analysis unburned carbon proximate analysis ultimate analysis

 
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