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Enhanced cross-flow filtration with flat-sheet ceramic membranes by titanium-based coagulation for membrane fouling control

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Frontiers of Environmental Science & Engineering 2022年第8期16卷 269-284页

作者： Xiaoman Liu Chang Tian Yanxia Zhao Weiying Xu dehua dong Kaimin Shih Tao Yan Wen Song School of Water Conservancy and Environment University of JinanJinan 250022China School of Environmental Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China School of Material Science and Engineering University of JinanJinan 250022China Department of Civil Engineering The University of Hong KongHong Kong 999077China

Application of ceramic membrane(CM)with outstanding characteristics,such as high flux and chemical-resistance,is inevitably restricted by membrane *** was an economical and effective technology for membrane fouling *** study investigated the filtration performance of ceramic membrane enhanced by the emerging titanium-based coagulant(polytitanium chloride,PTC).Particular attention was paid to the simulation of ceramic membrane fouling using four widely used mathematical *** show that filtration of the PTC-coagulated effluent using flat-sheet ceramic membrane achieved the removal of organic matter up to 78.0%.Permeate flux of ceramic membrane filtration reached 600 L/(m2$h),which was 10-fold higher than that observed with conventional polyaluminum chloride(PAC)*** PTC,fouling of the ceramic membrane was attributed to the formation of cake layer,whereas for PAC,standard filtration/intermediate filtration(blocking of membrane pores)was also a key fouling *** sum up,cross-flow filtration with flat-sheet ceramic membranes could be significantly enhanced by titanium-based coagulation to produce both high-quality filtrate and high-permeation flux.

关键词： Ceramic membrane Coagulation Polytitanium chloride Membrane fouling

Robust Joule-heating ceramic reactors for catalytic CO oxidation

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Journal of Advanced Ceramics 2022年第7期11卷 1163-1171页

作者： Fangsheng LIU Zhibo ZHAO Yuyao MA Yi GAO Jiajie LI Xun HU Zhengmao YE Yihan LING dehua dong School of Materials Science and Engineering University of JinanJinan 250022China School of Materials and Physics China University of Mining and TechnologyXuzhou 221116China

Joule-heating reactors have the higher energy efficiency and product selectivity compared with the reactors based on radiative *** Joule-heating reactors are constructed with electrically-conductive metals or carbon materials,and therefore suffer from stability issue due to the presence of corrosive or oxidizing gases during high-temperature *** this study,chemicallystable and electrically-conductive(La_(0.80)Sr_(0.20))_(0.95)FeO_(3)(LSF)/Gd_(0.1)Ce_(0.9)O_(2)(GDC)ceramics have been used to construct Joule-heating reactors for the first *** the advantage of the resistance decrease of the ceramic reactors with temperature increase,the ceramic reactors heated under current control mode achieved the automatic adjustment of heating to stabilize reactor *** addition,the electrical resistance of LSF/GDC reactors can be tuned by the content of the highconductive LSF in composite ceramics and ceramic density via sintering temperature,which offers flexibility to control reactor *** ceramic reactors with dendritic channels(less than 100μm in diameter)showed the catalytic activity for CO oxidation,which was further improved by coating efficient MnO_(2)nanocatalyst on reactor channel *** Joule-heating ceramic reactors achieved complete CO oxidation at a low temperature of 165℃.Therefore,robust ceramic reactors have successfully demonstrated effective Joule heating for CO oxidation,which are potentially applied in other high-temperature catalytic reactions.

关键词： Joule heating ceramic reactor microchannel reactor temperature control CO oxidation

Mn-N-P doped carbon spheres as an efficient oxygen reduction catalyst for high performance Zn-Air batteries

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Chinese Chemical Letters 2023年第1期34卷 177-181页

作者： Jiajie Li Shanbao Zou Jinzhen Huang Xiaoqian Wu Yue Lu Xundao Liu Bo Song dehua dong School of Materials Science and Engineering University of JinanJi nan 250022China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China

Low-cost and efficient oxygen reduction reaction(ORR)electrocatalysts are the key to developing Zn-air batteries for renewable energy ***,the Mn-N-P doped carbon sphere was prepared through polymerization of hexachlorotripolyphosphazene(HCCP)and phloroglucinol,and then followed the calcination at 900°*** calculations demonstrated the introduction of Mn in N-P doped carbon could lower the dissociation barrier of O2into O*and promote the ORR through a *** asprepared catalysts exhibited a half-wave potential of 0.82 V *** and limiting current density of 5.2 m A/cm^(2)toward ORR,which was comparable to those of the commercial Pt/C *** addition,Zn-air batteries with 0.05 Mn-N-P-C catalysts showed a high specific capacity of 830 m Ah/gZnand excellent cycle *** facile approach demonstrated herein could be a solution to develop optimum non-precious metal catalysts for the application in cathodes of proton exchange membrane fuel *** study also provides new insight to design the catalysts of multi-heteroatom coordinated metal in the carbon matrix for both fundamental researches and practical applications.

关键词： Oxygen reduction reaction Zn-air batteries Transition metal Doped carbon spheres

Factors influencing Li^(+)migration in garnet-type ceramic electrolytes

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Journal of Materiomics 2019年第2期5卷 214-220页

作者： Yu Huan Yi Fan Yining Li Baoyi Yin Xun Hu dehua dong Tao Wei School of Material Science and Engineering University of Jinan336 Nanxinzhuang West RoadJinanShandong250022China

Garnet-type ceramic electrolyte with exceptionally high Li^(+) conductivity has attracted wide interests for the development of safe electrochemical ***,the factors affecting the ionic migration still deserve more *** this study,five garnet-types ceramic electrolyte were chosen to investigate the *** thermal behavior of garnet-type electrolyte during sintering was studied to achieve high *** electrochemical properties are correlated with crystal structure,migrating route and lattice *** influening factors were discussed to analyze the ionic migration in garnet-type ceramic electrolyte.

关键词： ceramic conductivity. electrolyte

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激光选区熔融制备燃料电池电解质层工艺研究

陶瓷学报 2022年第5期43卷 917-925页

作者：徐晓强邱金勇董德华黄道伟孙明丰季华实验室广东佛山528200 济南大学山东济南250024 苏州倍丰激光科技有限公司江苏苏州215000

固体氧化物燃料电池(SOFC)是一种能量转换效率高、环境友好的全固态发电装置,其关键组成为电解质,阴极、阳极氧化物陶瓷材料。激光选区熔融作为3D打印技术的一种关键技术,是通过高能量激光将粉料完全熔融的过程。研究通过激光选区熔融... 详细信息

固体氧化物燃料电池(SOFC)是一种能量转换效率高、环境友好的全固态发电装置,其关键组成为电解质,阴极、阳极氧化物陶瓷材料。激光选区熔融作为3D打印技术的一种关键技术,是通过高能量激光将粉料完全熔融的过程。研究通过激光选区熔融技术分层制备固体氧化物燃料电池电解质层,通过比较不同粉体打印效果、调整激光功率、扫描速度、离焦距离关键工艺参数来获得电解质层,得到最佳打印参数为:功率100W,扫描速度200mm·s^(-1),离焦距离10 mm。其能够打印出具有一定精度和尺寸的陶瓷件,为SOFC电解质层的制备提供了一种新的思路。

关键词：激光选区熔融电解质层粉体材料工艺参数

基于滑动分块百分位数Bootstrap法的风电功率概率区间预测

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太阳能学报 2019年第2期40卷 430-437页

作者：杨锡运张璜关文渊董德华华北电力大学控制与计算机工程学院北京102206 中船电子科技有限公司北京100070

提出一种基于非参数滑动分块百分位数Bootstrap法(MBPB)的风电功率概率区间预测方法。由于风功率数据存在显著的时间相依结构,该方法首先对预测功率进行等间隔划分,再以某区间内的预测误差序列为样本,借助滑动分块Bootstrap法(MBB)抽样... 详细信息

提出一种基于非参数滑动分块百分位数Bootstrap法(MBPB)的风电功率概率区间预测方法。由于风功率数据存在显著的时间相依结构,该方法首先对预测功率进行等间隔划分,再以某区间内的预测误差序列为样本,借助滑动分块Bootstrap法(MBB)抽样产生多个伪样本,然后对伪样本数据通过滑动分块百分位Bootstrap法和四分位法相结合的统计推断生成一定置信水平下的误差上下限,进而得到该预测功率段内的概率预测区间。同时建立包含区间覆盖率和区间平均带宽的评价指标,通过将其与百分位法、百分位数Bootstrap(PB)法的预测结果对比,表明基于MBPB的概率性预测区间的覆盖率更高,平均带宽更窄,精度更好且效果也更优。

关键词：风电功率预测概率区间滑动分块百分位数Bootstrap法四分位数

结合序列分布概率的储能系统典型功率曲线提取方法

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电力自动化设备 2017年第10期37卷 8-14,28页

作者：杨锡运任杰李相俊董德华贾学翠华北电力大学控制与计算机工程学院北京102206 中国电力科学研究院新能源与储能运行控制国家重点实验室北京100192

在平滑光伏电站功率波动的应用场景下,提出一种储能系统典型功率曲线挖掘方法。基于储能系统功率在纵向时序的区间分布特性,利用基于Bloch球面的量子遗传算法寻找所有分布概率大于阈值的分布区间及相应特征功率值;根据特征功率值得到该... 详细信息

在平滑光伏电站功率波动的应用场景下,提出一种储能系统典型功率曲线挖掘方法。基于储能系统功率在纵向时序的区间分布特性,利用基于Bloch球面的量子遗传算法寻找所有分布概率大于阈值的分布区间及相应特征功率值;根据特征功率值得到该时刻典型功率值,从而获得典型功率曲线。通过对挖掘得到的4种天气类型下储能系统典型功率曲线进行综合分析,验证了所提方法的有效性。

关键词：储能功率平滑典型功率曲线分布概率区间

Strain and process engineering toward continuous industrial fermentation

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Frontiers of Chemical Science and Engineering 2023年第10期17卷 1336-1353页

作者： Yufei dong Ye Zhang dehua Liu Zhen Chen Key Laboratory of Industrial Biocatalysis(Ministry of Education) Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Tsinghua Innovation Center in dongguan Dongguan 523808China Center for Synthetic and Systems Biology Tsinghua UniversityBeijing 100084China

Most current biotechnology industries are based on batch or fed-batch fermentation processes,which often show low productivity and high production costs compared to chemical *** increase the economic competitiveness of biological processes,continuous fermentation technologies are being developed that offer significant advantages in comparison with batch/fed-batch fermentation processes,including:(1)removal of potential substrates and product inhibition,(2)prolonging the microbial exponential growth phase and enhancing productivity,and(3)avoiding repeated fermentation preparation and lowering operation and installation ***,several key challenges should be addressed for the industrial application of continuous fermentation processes,including(1)contamination of the fermentation system,(2)degeneration of strains,and(3)relatively low product *** this study,we reviewed and discussed metabolic engineering and synthetic biology strategies to address these issues.

关键词： continuous fermentation productivity contamination strain degeneration metabolic engineering

液氮灭火系统管路输送压力损失影响因素及计算方法研究

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消防科学与技术 2024年第1期43卷 76-81页

作者：陈红光董海斌张少禹张德华应急管理部天津消防研究所天津300381 工业与公共建筑火灾防控技术应急管理部重点实验室天津300381 天津市消防安全技术重点实验室天津300381

结合液氮防灭火工程管路实际,分析了环境温度、液氮温度、入口流速、管长、管径、出口口径对管路出口液氮含量、输送压降的影响,并结合模拟与试验分析了均相模型预测管路输送压降的计算方法。结果表明:环境温度、液氮温度对液氮含量和... 详细信息

结合液氮防灭火工程管路实际,分析了环境温度、液氮温度、入口流速、管长、管径、出口口径对管路出口液氮含量、输送压降的影响,并结合模拟与试验分析了均相模型预测管路输送压降的计算方法。结果表明:环境温度、液氮温度对液氮含量和管路压降影响较小;管路流速越快、输送距离越长、管径越小,压降增加越显著;随管路出口口径的减小压降迅速增加。对于低干度的气液两相氮适合用于均相模型计算,提出的简化计算经验模型压降预测值与试验值吻合良好,可以预测气液两相氮的管路输送压降,为液氮输送管路的工程应用设计提供理论支撑。

关键词：储能安全液氮管路输送液氮含量压降均相模型预测模型