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《中国粉体技术》2018年第24卷第6期文章摘要
作者:管理员  来源:本站原创  发布时间:2018年12月25日  点击次数:276

快速加热条件下碳酸钙分解动力学

李佳容12, 朱建国12, 朱书骏12, 刘敬樟2, 李百航2

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

摘要:在自行搭建的多气氛竖直管式高温煅烧实验平台上进行碳酸钙高温煅烧实验,样品在推入炉膛后即升温至较高温度。由对样品失质量曲线的分析可知:在快速加热条件下,温度对碳酸钙分解反应有较大影响,在950~1 000 ℃内影响较大,在1 000~1 100 ℃内影响较小;通过对比动力学模型得知:在快速加热条件下,反应气氛为CO2-N2混合气氛(CO2N2体积分数分别为25%75%)、纯N2时碳酸钙分解反应最概然模型为三维随机成核和随后生长模型,且2种气氛的表观活化能E分别为207.741203.786 kJ/mol,说明CO2对分解炉中碳酸钙分解存在抑制作用,会延长碳酸钙的完全分解时间。

关键词:碳酸钙; 高温煅烧; 最概然模型; 活化能

中图分类号:TQ127.1+3   文献标志码:A

文章编号:1008-5548201806-0001-07

 

Kinetics of calcium carbonate decomposition under rapid heating condition

LI Jiarong12 ZHU Jianguo12 ZHU Shujun12

LIU Jingzhang2 LI Baihang2

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

AbstractThe calcium carbonate decomposition test was conducted on an isothermal multi-atmosphere vertical tube combustion test platform. The sample was instantly heated up to the operating temperature after being pushed into the furnace. Through the analysis of the weight loss curve of the sample it can be found that in the rapid heating condition the temperature has great influence on the decomposition reaction of calcium carbonate. Furthermore the temperature has greater influence in the lower temperature range950~1 000 ℃) than in the higher range1 000~1 100 ℃). By comparing several kinetic models the most probable kinetic model of calcium carbonate decomposition at CO2-N2 and pure N2 under rapid heating condition is random nucleation and growth model n=1/3. The activation energy values of calcium carbonate decomposition reaction are 207.741 and 203.786 kJ/mol respectively. The results show that CO2 inhibits the decomposition of calcium carbonate in the precalciner and it will prolong the complete decomposition time of calcium carbonate.

Keywords calcium carbonate high-temperature decompositionkinetic model activation energy

 

 

油基液体颗粒计数器校准用标准物质的研制及应用

刘俊杰1, 肖 骥1, 王静文2, 齐天缘2

1. 中国计量科学研究院, 北京 100029 2. 中国石油大学(北京), 北京 102249

摘要:针对油基液体颗粒计数器(APC)的准确校准需求,采用重力沉降、超声筛分和扫描电子显微镜等制备及测量技术,开展准单分散中级试验粉尘颗粒标准物质(AM-MTD-CRM)的研制。标准物质粒径涵盖了APC 的常用测量范围,定值不确定度小于2.5%k=2),远低于现有多分散中级试验粉尘标准物质(P-MTD-CRM)的定值不确定度。所研制AM-MTD-CRM的定值不确定度小、粒径分布窄,解决了P-MTD-CRM中粒径测量准确性差、大粒径范围统计颗粒数量少等问题,使得APC校准结果不确定度得到很大改善。

关键词:液体颗粒计数器; 标准物质; 校准; 中级试验粉尘

中图分类号:TH741   文献标志码:A

文章编号:1008-5548201806-0008-06

 

Development and application of certified reference materials used for oil-based liquid automatic particle counter calibration

LIU Junjie1 XIAO Ji1WANG Jingwen2 QI Tianyuan2

 1. National Institute of Metrology Beijing 100029 China 2. China University of Petroleum Beijing 102249 China

AbstractFor the purpose of accurate calibration for the oil-based liquid automatic particle counterAPC), the preparation and measurement techniques such as gravity sedimentation ultrasonic sieving and scanning electron microscopeSEM), were used to develop the approximately-monodispersed MTD certified reference materialsAM-MTD-CRM. The series particle size CRM cover the routine measurement range of APC and the uncertainty of the certified value was less than 2.5% k=2), which was far below the uncertainty of polydisperse MTD CRM P-MTD-CRM. Because of the low uncertainty and the narrow particle size distribution of the AM-MTD-CRM which overcome the difficulties of poor accuracy of particle sizing and less particle statistics for P-MTD-CRM it makes the APC calibration uncertainty is greatly improved.

Keywords liquid automatic particle counter certified reference materials calibration medium test dust

 

 

集束式对流微通道反应器制备超细MnO2粉体

魏开轩, 吴 波, 王倩倩, 文利雄

(北京化工大学 有机无机复合材料国家重点实验室; 教育部超重力工程研究中心, 北京 100029

摘要:以MnSO4·H2OKMnO4为原料,去离子水为溶剂,采用液相沉淀法,在集束式对流微通道反应器中合成超细球形MnO2颗粒;采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、热重-差热分析仪(TGA-DTA)、电化学工作站对MnO2颗粒进行分析表征,研究工艺条件对MnO2颗粒尺寸以及电化学性能的影响。结果表明:通过控制操作条件,在集束式对流微通道反应器中可以得到形貌与性能良好的MnO2颗粒;在陈化2 h220 ℃煅烧工艺条件下,得到MnO2的比电容为175 F/g左右,循环充放电500次后性能下降约10%

关键词:微反应器; 液相沉淀; 二氧化锰; 比电容

中图分类号:TQ152   文献标志码:A

文章编号:1008-5548201806-00014-05

 

Preparation of ultrafine manganese dioxide particles by clustered countercurrent flow micro-channel reactor

 

WEI Kaixuan WU BoWANG Qianqian WEN Lixiong

 State Key Laboratory of Organic-Inorganic Composites Research Center of Ministry of Education for High Gravity Engineering & Technology Beijing University of Chemical Technology Beijing 100029 China

 

Abstract  Ultrafine spherical MnO2 particles were prepared via the liquid deposition method in a clustered countercurrent flow micro-channel reactorC-CFMCR), in which two streams of MnSO4 and KMnO4 aqueous solutions reacted with each other. Scanning electron microscopy SEM), X-ray diffraction XRD),thermogravimetric and differential thermal analysis TGA-DTA and electrochemical workstation were used to characterize the samples. The influence of preparation conditions on particle morphologies and electrochemical properties were investigated. The results indicate that MnO2 with fine morphology and properties  is  obtained  under  optimized  operating  conditions  in C-CFMCR.  With  aging  time  of  2 h  and  calcination  for  2 h  at 220 ℃, MnO2  particles  with  a  specific  capacitanceSC of  about 175 F/g are synthesized. After 500 cycles of galvanostatic charge and discharge the capacitance loss is about 10%.

Keywords microreactor liquid deposition manganese dioxide specific capacitance

 

 

钇掺杂亚稳相γ-Bi2O3的合成及光催化性能

李洪全, 郑树凯, 丁帮福, 闫小兵

(河北大学 电子信息工程学院, 河北 保定 071002

摘要:在不同温度下,以氢氧化钠作为沉淀剂,采用共沉淀法合成纯的以及不同浓度钇掺杂亚稳相γ-Bi2O3X射线衍射结构表征显示,温度越高,制备纯相γ-Bi2O3反应时间越短,而钇引入并未改变样品的晶体结构。扫描电子显微镜对样品进行微观形貌表征,发现所有颗粒样品呈现四面体形状,且钇掺杂增加颗粒聚集度。随着掺杂浓度增加,附着在四面体表面上的小颗粒尺寸逐渐增大。紫外可见漫反射光谱分析表明,钇掺杂引起禁带宽度变窄。选择罗丹明B为典型污染物以及γ-Bi2-xYxO3为催化剂,光催化降解性能随掺杂而提高。

关键词:γ-Bi2O3Y掺杂;光催化降解

中图分类号:O643   文献标志码:A

文章编号:1008-5548201806-0019-06

 

Synthetization and photocatalysis property of metastable phase γ-Bi2O3 doped by yttrium

LI Hongquan ZHENG ShukaiDING Bangfu YAN Xiaobing

 College of Electronic Information EngineeringHebei University Baoding 071002 China

Abstract Precipitation method was used to synthesize pure phase γ-Bi2O3 and different concentration yttrium doping samples with NaOH as precipitant at different temperatures. X-ray diffraction characterization of the samples shows that the required reaction time shortened along with temperature increase and crystal structure of all samples are unchanged by introducing yttrium into lattice. The microstructure of the sample is characterized by scanning electron microscopy. It is found that all samples exhibite tetrahedral particles and yttrium doping increases particle aggregation degree. The sizes of small particles attached to tetrahedral surface become larger gradually with increment of doping concentration. Ultraviolet visible diffuse reflectance spectroscopy analysis indicates the forbidden band width narrowed due to yttrium doping. Selecting Rhodamine B as model pollutant and γ-Bi2-xYxO3 as photocatalyst the degradation performance is enhanced with doping.

Keywords: γ-Bi2O3 Y doping photocatalytic degradation

 

 

电熔法生产氧化锆副产物硅灰性质与颗粒特性

孙思佳, 丁 浩, 史亚超

(中国地质大学(北京) 材料科学与工程学院, 北京 100083

摘要:为优化电熔法生产氧化锆过程副产物硅灰(DR-GH)加工技术、提高其利用价值,采用粒度分布测试、扫描电子显微镜(SEM)和透射电子显微镜(TEM)观察,并结合化学元素、X射线衍射(XRD)分析、DR-GH水悬浮液搅拌手段,对DR-GH的化学成分、物相组成、颗粒特性进行研究。结果表明,DR-GH主要由无定形SiO2实心体微球和少量ZrO2粒子组成,SiO2微球原级粒径为0.5~3 μm,彼此间先聚集形成结合力强的二次颗粒,再由二次颗粒凝聚成结合力较弱的SiO2团聚体。对DR-GH水悬浮液搅拌可使SiO2团聚体解聚至二次颗粒尺度,其粒度d9018.551 μm降至5.379 μmd502.582 μm降至1.88 μm

关键词:硅灰; 无定形SiO2; 颗粒解聚

中图分类号:TQ115   文献标志码:A

文章编号:1008-5548201806-0025-0

 

Properties and particle characteristics of by-product silica fume during production process of electric smelting zirconia

SUN Sijia DING Hao SHI Yachao

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

AbstractFor optimizing the processing technology of by-product DR-GH during the production of electric smelting zirconia and increasing utilization value of DR-GH the chemical composition phase composition and particle characteristics of DR-GH were studied through particle size distribution testing scanning electron microscope SEM and transmission electron microscope TEM observing combining with the analyzing of chemical elements and X-ray diffraction XRD. The results show that the DR-GH is composed of amorphous SiO2 solid sphere and a few  ZrO2 particles. The diameter  of  SiO2 primary particle is 0.5~3 μm and the primary particles first aggregate to form secondary particles with strong binding force. The secondary particles agglomerate into a weakly bound SiO2 agglomerate. The SiO2 secondary particles can be obtained by stirring the DR-GH suspension of which the d90 of DR-GH dropped from 18.551 μm to 5.379 μm and the d50 dropped from 2.582 μm to 1.88 μm.

Keywords silica fume amorphous SiO2 particle characteristics

 

 

电选粉煤灰颗粒图像识别与烧失量预测模型

陈师杰1a, 李海生1a1b, 陈英华1a1b, 温晓龙1a, 章新喜1a1b, 孙 猛1a, 陈 明2

1. 中国矿业大学 a. 化工学院; b. 煤炭加工与高效洁净利用教育部重点实验室, 江苏 徐州 2211162. 中国平煤神马集团一矿, 河南 平顶山 467000

摘要:在相同光照条件下,运用MATLAB软件控制工业相机获取不同烧失量粉煤灰的图像信息,根据粉煤灰中不同组分对于光反射的差异性,提取脱炭粉煤灰不同组分的图像特征参数,利用极限学习机神经网络建立烧失量与图像特征的数学模型,对比烧失量的预测效果获得最佳的激活函数,实现脱炭粉煤灰烧失量的在线快速检测。结果表明,极限学习机建立的预测模型能够准确识别电选粉煤灰的图像特征,快速获得粉煤灰烧失量数据,准确度高,可用于工业生产中电选粉煤灰烧失量的快速在线检测。

关键词:粉煤灰; 烧失量; 图像特征; 数学模型; 极限学习机

中图分类号:TD97   文献标志码:A

文章编号:1008-5548201806-0030-06

 

Image recognition and ignition loss prediction model for triboelectrostatic beneficiation of fly ash particles

CHEN Shijie1a LI Haisheng1a1b CHEN Yinghua1a1b WEN Xiaolong1a ZHANG Xinxi1a1b SUN Meng1a CHEN Ming2

 1. a.School of Chemical Engineering and Technology b. Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education China University of Mining and Technology Xuzhou 221116 China 2. The First Mining Company of China Pingmei Shenma GroupPingdingshan 467000 China

Abstract  Under the same lighting conditions the MATLAB software was used to control the industrial camera in order to obtain the image information of the different ignition loss for fly ash. Taking into account the light reflectance differences of different components in the fly ash extraction of different components of the triboelectrostatic beneficiation fly ash Image feature parameters the extreme learning machine neural network was used to establish a mathematical model between the ignition loss and image characteristics and the best activation function was got by comparing the prediction effect of loss on ignition and the on-line rapid detection of the ignition loss was realized. The results show that the prediction model established by extreme learning machine can accurately identify the image characteristics and quickly obtain the the ignition loss of fly ash. The extreme learning machine is high precision and it provides a technical reference for the rapid online testing of the fly ash ignition loss in industrial production.

Keywords fly ash loss on ignition image characteristicsmathematical mode extreme learning machine

 

 

基于离散元法的煤散料堆积角试验研究

夏 蕊1, 杨兆建1, 李 博1 2, 王学文1, 未 星1, 李铁军1

1. 太原理工大学 机械工程学院; 煤矿综采装备山西省重点实验室, 山西 太原 0300242. 山西煤矿机械制造股份有限公司 博士后科研工作站, 山西 太原 030031

摘要:堆积角实验可用于煤散料的离散元微观参数优化,为煤散料的准确仿真分析奠定基础。对3种不同粒径的煤散料进行堆积角实验,采用图像处理技术获取煤散料堆积角,研究颗粒尺寸对堆积角的影响;采用离散元法建立不同的煤散料模型,通过堆积过程的仿真分析,研究煤散料模型的复杂程度对仿真准确性的影响;在此基础上研究落料高度对堆积角的影响。结果表明:随着颗粒尺寸变大,堆积角也相应增加;接近真实颗粒形状建立的离散元模型能得到更好的仿真效果;随着落料高度的增加,堆积角呈线性减小的趋势。

关键词:离散元法; 堆积角; 煤散料; 落料高度; 图像处理

中图分类号:TP391.9 O347.7   文献标志码:A

文章编号:1008-5548201806-0036-07

 

Experimental study for repose angle of coal bulk material based on discrete element method

 

XIA Rui1 YANG Zhaojian1 LI Bo1 2 WANG Xuewen1 WEI Xing1 LI Tiejun1

 1. Shanxi Key Laboratory of Fully Mechanized Coal Mining Equipment College of Mechanical Engineering Taiyuan University of Technology Taiyuan 030024China 2. Post-doctoral Scientific Research Station Shanxi Coal Mining Machinery Manufacturing Co. Ltd. Taiyuan 030031 China

Abstract  The repose angle test of coal bulk could be used for optimization of the discrete element method DEM parameters laying the foundation for accurate simulation analysis. Three coal particle sizes were chosen to study the influence by particle size on the repose angle using the repose angle test and image processing technology. The research established different models of bulk coal to analyze the influence of the DEM model accuracy on simulation results. Based on this the effect of falling height on the repose angle was studied. Results show that the repose angle increases as the particle size increases. And better simulation results can be achieved by using the particle model similar to the real bulk coal. Besides the repose angle decreases linearly as the falling height increases.

Keywords discrete element method repose angle bulk coal falling height image processing

 

 

超细磷石膏作缓凝剂对水泥基材料性能的影响

李 萍1, 徐中慧1, 陈筱悦1, 林龙沅1, 帅 勤1, 姚正珍1, 杨飞华2, 黄 阳1

1. 西南科技大学 固体废物处理与资源化教育部重点实验室; 非煤矿山安全技术四川省高等学校重点实验室, 四川 绵阳 621010 2. 固废资源化利用与节能建材国家重点实验室, 北京 100041

摘要:采用蒸汽动能磨对水泥缓凝剂(磷石膏)进行超细加工,将质量分数为4%的超细加工前后的磷石膏(PG0PG35)与水泥熟料(C)混合制备胶凝材料,研究超细磷石膏作缓凝剂对水泥基材料性能的影响;超细加工后的磷石膏粒径和含水率明显降低,制备的水泥基材料的凝结时间满足GB 175200728 d抗压强度显著提高,孔隙率降低了11.32%;同时其水化放热速率加快,累积放热量增加。XRDSEM分析表明,PG0-CPG35-C这2组水泥的主要水化产物为CaOH2C-S-H凝胶;PG35-C水泥浆体中有钙矾石生成,微观结构更为致密。

关键词:蒸汽动能磨; 超细磷石膏; 缓凝剂; 水泥基材料

中图分类号:TQ172   文献标志码:A

文章编号:1008-5548201806-0043-05

 

Effects of superfine phosphogypsum  as retarder on properties of cement-based material

LI Ping1 XU Zhonghui1 CHEN Xiaoyue1 LIN Longyuan1 SHUAI Qin1 YAO Zhengzhen1 YANG Feihua2 HUANG Yang1

 1. The Non-Coal Mine Safety Technology Key Laboratory of Colleges and Universities in Sichuan Province Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education Southwest University of Science and Technology Mianyang 621010 China 2. State Key Laboratory of Solid Waste Reuse for Building Materials Beijing 100041 China

 

Abstract The cement retarder phosphogypsum was ultra-fine processed by superheated steam powdered jet mill. The phosphogypsumPG0 and superfine phosphogypsum PG35which mass fraction were 4% were mixed in cement clinker C to prepare a cement-based material respectively. And the effect of ultrafine phosphogypsum as retarder on the properties of cement-based materials were studied. The particle size and moisture content of phosphogypsum after ultra-fine processed are significantly reduced and the setting time of cement-based materials  prepared  from  superfine  phosphogypsum conforms GB175-2007. The compressive strength for 28 d of cement hardenite with superfine phosphogypsum is significantly increased. The porosity is decreased by 11.32% and the rate of hydration heat release is accelerated. XRD and SEM analysis show that the hydration products of PG0-C and PG35-C cements are CaOH2 and C-S-H gels. However the ettringite is also formed in the hardenite of PG35-C cement which results in a much denser microstructure of the hardenite.

Keywords superheated steam powdered jet mill superfine phosphogypsum powder retarder cement-based materials

 

 

乙二胺四乙酸体系中原位还原法制备银包覆铜粉

邹园敏1, 刘志宏1, 李玉虎2, 夏隆巩1

1. 中南大学 冶金与环境学院, 湖南 长沙 410083 2. 江西理工大学 冶金与化学工程学院, 江西 赣州 341000

摘要:在乙二胺四乙酸(EDTA-AgI-CuII-H2O体系中, 以铜粉为基体、 硝酸银为银源、聚乙烯吡咯烷酮(PVP)为分散剂、14-丁炔二醇为整平剂,采用原位还原法制备银包覆铜粉;使用扫描电镜(SEM)、X射线衍射测试仪(XRD)、物镜球差校正场发射透射电镜(STEM-EDS)、 同步热分析仪(TGA)、比表面及空隙分析仪(BET)等仪器对产品进行了系统表征。结果表明:银在铜粉基体上包覆成功,且包覆层厚度达100~150 nm;产品呈分散性良好的多面体颗粒,粒径约2.5 μmTGA检测结果表明,银包覆层的增加提升了铜粉的抗氧化性。

关键词:原位还原法; 乙二胺四乙酸(EDTA-AgI-CuII-H2O体系; 银包覆铜粉

中图分类号:TB34   文献标志码:A

文章编号:1008-5548201806-0048-07

 

Preparation of silver coated copper powder by in-situ reduction method in ethylene diamine tetraacetic acid system

ZOU Yuanmin1 LIU Zhihong1LI Yuhu2 XIA Longgong1

 1. School of Metallurgy and Environment Central South University Changsha 410083 China 2. School of Metallurgy and Chemical Engineering Jiangxi University of Science and Technology Ganzhou 341000 China

Abstract Using  the  copper  powders  as  the  substrate the silver   nitrate   as   the  silver  resource PVP  as  the  dispersant and 14-butylene  glycol  as  the  leveling  agent  silver  coated copper  powders  were  prepared   by  in-situ   reduction  method  in ethylene diamine tetraacetic acidEDTA-AgI-CuII-H2O   system.   The   products   were systematically characterized by using scanning electron microscopySEM), X-ray diffraction meterXRD), optical lens spherical aberration correction field emission transmission electron microscopySTEM-EDS), simultaneous thermalanalyzerTGA), specific surface and void analyzerBET and other instruments. The results show that silver is successfully coated on copper substrate and the thickness of  plating layer is about 100~150 nm. Silver coated copper powders are a kind of polyhedron granules with good dispersibility whose particle size is about 2.5 μm. The TGA test results show that the increase of silver plating layer improves the oxidation resistance of copper powder.

Keywordsin-situ reduction  method ethylene diamine tetraacetic acidEDTA-AgI-CuII-H2O  system  silver  coated  copper powders

 

 

基于正交试验的铝粉爆炸猛度影响因素分析

关文玲,  孙 浩, 董呈杰

(天津理工大学 环境科学与安全工程学院, 天津 300384

摘要:为探究粉尘爆炸实验中粉尘质量浓度、点火能量、点火延迟时间及惰性物质质量分数对粉尘爆炸猛度的影响,采用正交试验法并利用20 L球形爆炸测试装置研究了最大爆炸压力和最大升压速度。结果表明:对最大爆炸压力和最大升压速率影响最为显著的因素分别为粉尘质量浓度和点火能量;在实验浓度范围内,最大爆炸压力及最大升压速率随粉尘质量浓度、点火能增加而增加,随惰性物质质量分数增加而降低;同一质量浓度时最大爆炸压力下降值与惰性物质质量分数增加值线性相关,最大升压速率上升值与点火能增加值线性相关;同时,最大爆炸压力及最大升压速率受粉尘质量浓度影响显著。

关键词:铝粉; 正交试验; 粉尘爆炸; 点火能量; 点火延迟时间; 惰性物质质量分数; 粉尘浓度

中图分类号:X932   文献标志码:A

文章编号:1008-5548201806-0055-05

 

Influence factors of explosion violence of aluminum powder based on orthogonal experiment

GUAN Wenling SUN Hao DONG Chengjie

 College of Environmental Science and Safety Engineering Tianjin University of Technology Tianjin 300384 China

Abstract In order to explore the effects of dust mass concentration ignition energy ignition delay time and inert mass fraction on the violence of aluminum dust explosion the maximum explosion pressure and the maximum rate of pressure rise were conducted with 20 L spherical explosion test device and based on orthogonal experiment. The results show that dust mass concentration has the most significant effect on the maximum explosion pressure and ignition energy has the greatest effect on the maximum rate of pressure rise. Within the experimental concentration range the maximum explosion pressure and the maximum rate of pressure rise increase with increasing dust concentration and ignition energy and decrease with increasing inert mass fraction. Under the same mass concentration the maximum explosion pressure decreases linearly with increasing inert mass fration and the maximum rate of pressure rise increases linearly with the increase of ignition energy. Meanwhile dust mass concentration has both significant effect on the maximum explosion pressure and the maximum rate of pressure rise.

Keywords aluminum powder orthogonal experiment powder explosion ignition energy ignition delay time inert  material mass fraction dust concentration

 

 

挡板数量对多孔陶瓷干法制粉混合过程的影响

吴南星, 甘振华, 余冬玲, 方长福, 赵增怡, 廖达海

(景德镇陶瓷大学 机械电子工程学院, 江西 景德镇 333403

摘要:为探究多孔陶瓷干法制粉挡板数量对粉体混合均匀度影响,建立欧拉空气-粉体双相流模型分析空气与粉体运动状态,简化并构建粉体混合过程物理模型,修正重整规化群(renormalization group RNG k-ε湍流模型,分析挡板数量对粉体轴向、径向体积分数与速度云图、矢量图的影响,并改善挡板数量提高粉体混合均匀度。结果表明:当挡板数分别为1234时,粉体平均体积分数分别约为0.250.220.240.26,粉体平均速度分别约为0.70.60.50.4 m/s;制粉室内有2个挡板的粉体密度曲线后段约为2 g/cm3,密度曲线波动小,粉体混合均匀度最高。2个挡板制粉室内粉体堆积度最低。

关键词:多孔陶瓷; 干法制粉; 欧拉双相流; 挡板数量

中图分类号:TQ174.5   文献标志码:A

文章编号:1008-5548201806-0060-07

 

Effect of baffle number on porous ceramics dry granulation mixing process

WU Nanxing GAN Zhenhua YU DonglingFANG Changfu ZHAO Zengyi LIAO Dahai

 School of Mechanical and Electronic Engineering Jingdezhen Ceramic Institute Jingdezhen 333403 China

Abstract  In order to explore the influence of number of baffles on the powder mixing uniformity of porous ceramics the Euler two phase flow model was established to analyze the movement state of air and powder simplifying and setting up a physical model for the powder mixing process and modifying RNG k-ε turbulence model the influence of number of baffles on the axial and radial volume fraction velocity cloud chart and vector diagram was analyzed which improved the number of baffles to increase the uniformity of powder mixing. The results show that when the number of baffles is 1 2 3 4 respectively the average volume fraction of powder is about 0.25 0.22 0.24 0.26 respectively the average speed of powder is about 0.70.60.50.4 m/s respectively when the granulation chamber contains two baffles the back section of the powder density curve is about 2 g/cm3 the fluctuation of density curve is small and the powder mixing uniformity is higher than the other three. The data shows the accumulation of powder in the two baffles chamber is lowest.

Keywords porous ceramics dry granulation euler two-phase flow baffle number

 

 

 

成拱工况下仓壁超压弹性波动态模拟分析

冯 永, 原子然, 张盼盼, 谢飞亚, 李晓一, 李 萌

(河南工业大学 土木建筑学院, 河南 郑州 450000

摘要:基于工程实例,运用PFC离散元模拟改变参数实现成拱;系统分析筒仓卸粮成拱时仓壁超压、弹性波的形成和传播规律。结果表明:卸粮成拱时,由于颗粒出流速度降低,仓壁出现超压;随着筒仓高度的增加,卸粮成拱时仓壁的侧压力降低,超压的增量减小,各深度处超压系数也随之增大;超压波峰随着高度的增加先后出现,超压从拱脚处开始,在仓壁上以波的形式向上传播。模拟结果分析发现,波动在筒仓各深度处出现时间间隔均匀,可以认为超压波动的传播比较均匀,揭示了成拱工况下仓壁超压的形成机理。

关键词:卸粮成拱; 仓壁超压; 超压弹性波; PFC离散元模拟

中图分类号:TU267+.1   文献标志码:A

文章编号:1008-5548201806-0067-08

 

Dynamic simulation analysis of elastic overpressure fluctuation on silo wall under arched condition

FENG Yong YUAN Ziran ZHANG Panpan XIE Feiya LI Xiaoyi LI Meng

 School of Civil Engineering Henan University of Technology Zhengzhou 450000 China

Abstract  Based on an engineering example PFC discrete element simulation was applied to realize arch formation by changing parameters. The formation and propagation rules of overpressure and elastic wave of silo wall were systematically analyzed when silo grain was discharged into arch. The results indicate that the warehouse wall appears overpressure when the grain is discharged into an arch due to the reduction of particle discharge velocity. As the height of silo increases the side pressure of silo wall decreases when grain is discharged into arch the increment of overpressure decreases and the overpressure coefficient increases at each depth The overpressure wave peaks appear successively with the increase of height indicating that the overpressure starts from the arch foot and spreads upward in the form of waves on the wall of the warehouse. Through the analysis of the simulation results it is found that the time interval of the fluctuation is even at all depths of the silo. The formation mechanism of overpressure of warehouse wall under arch-forming condition is revealed.

Keywords grain arched overpressure on silo wall elastic overpressure fluctuation PFC discrete element simulation.

 

 

 

 

 

 
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