检索结果-南通市图书馆

“共价”型全疏/滑移表面构建及膜蒸馏性能研究

在线全文

学校读者我要写书评

暂无评论

膜科学与技术 2024年第1期44卷 27-36页

作者：李鹏李猛薛宇轩张庆五陈晓玲张轩南京市水务集团有限公司南京210002 新型膜材料工信部重点实验室南京理工大学南京210094

由于孔隙润湿、矿物结垢或结构不稳定等引起的膜功能层失效问题是膜蒸馏(MD)技术的关键挑战,严重影响其长期运行稳定性.本文提出一种“全共价”接枝修饰的方法,制备具有优异MD性能的全疏/滑移膜蒸馏膜材料.具体而言,通过使用聚多巴胺型... 详细信息

由于孔隙润湿、矿物结垢或结构不稳定等引起的膜功能层失效问题是膜蒸馏(MD)技术的关键挑战,严重影响其长期运行稳定性.本文提出一种“全共价”接枝修饰的方法,制备具有优异MD性能的全疏/滑移膜蒸馏膜材料.具体而言,通过使用聚多巴胺型插层将纳米硅球共价键合在聚偏氟乙烯(PVDF)膜表面,并采用巯基-烯烃点击化学进行直接表面氟化改性.通过接触角测试,发现所制备的PDA/PVDF-C膜具有超高的静态水接触角(163.5°±0.9°)和极低的滚动角(5.6°±1.2°).在不同表面张力液体的侵蚀作用下,该膜均未出现膜孔的润湿现象,体现出优异的抗润湿性能.由于该膜表面特殊的全疏/滑移特性,该膜能够持久并稳定地处理含有表面活性剂的高盐卤水,延缓石膏垢的形成,运行性能显著优于商用疏水膜.该膜初始通量约为23.5 L/(m^(2)·h),运行前后始终保持对盐高达99%的截留.本研究提供了一种新颖而有效的方法开发“全共价”型MD膜,该膜具有优异的抗润湿、抗无机结垢以及结构稳定性,可用于高盐废水的资源化处理.

关键词：膜蒸馏全疏/滑移润湿结垢高盐水

在线全文

学校读者我要写书评

暂无评论

基于安全要求的机泵设备传动方式改造

石油化工设备技术 2024年第2期45卷 26-30,34页

作者：张倬权张庆武湖北特种设备检验检测研究院湖北武汉430077 中国石油化工股份有限公司荆门分公司湖北荆门448002

某炼化公司临氢装置的机泵设备采用皮带传动方式,不满足GB 50160—2008(2018版)《石油化工企业设计防火标准》相关要求,存在安全隐患,基于安全要求必须对该类机泵设备传动方式进行改造,以确保企业生产依法合规。文章针对不同结构的转动... 详细信息

某炼化公司临氢装置的机泵设备采用皮带传动方式,不满足GB 50160—2008(2018版)《石油化工企业设计防火标准》相关要求,存在安全隐患,基于安全要求必须对该类机泵设备传动方式进行改造,以确保企业生产依法合规。文章针对不同结构的转动设备,选择不同的传动方式,借助于SolidWorks软件对皮带轮进行建模,构造新的飞轮结构,同时结合生产实际需要修正了机泵设备的部分技术参数。改造后的机泵设备经过几个月的运行,结果显示:机泵振动、轴承温度、噪音满足相应规范要求;流量、扬程、电流、电压等技术性能达到使用要求,并能充分满足生产需求。上述结果表明,改造彻底清除了该类设备的安全隐患,同时还提高了机泵的运行效率,使其更加节能且安全可靠,达到了预期目的。该案例可为其他危险化学品企业同类安全隐患的治理整改提供借鉴。

关键词：石油化工机泵设备皮带传动改造

在线全文

学校读者我要写书评

暂无评论

基坑免降水开挖的组合式冻结法支护工艺研究

铁道标准设计 2024年第2期68卷 143-149页

作者：张松岳祖润卢相忠张庆武孙铁成胡田飞亓源水张俊洋石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室石家庄050043 唐山开滦建设(集团)有限责任公司河北唐山063000 石家庄铁道大学土木工程学院石家庄050043 苏州轨道交通市域一号线有限公司江苏苏州215000

近年来,随着地下水资源保护力度的不断增大,对基坑工程进行免降水开挖的需求愈加紧迫。为解决富水地层基坑工程施工中的免降水问题,提出一种新的基坑支护方法:传统悬挂式止水帷幕与水平冻土止水帷幕相结合的“组合式冻结法”。根据以往... 详细信息

近年来,随着地下水资源保护力度的不断增大,对基坑工程进行免降水开挖的需求愈加紧迫。为解决富水地层基坑工程施工中的免降水问题,提出一种新的基坑支护方法:传统悬挂式止水帷幕与水平冻土止水帷幕相结合的“组合式冻结法”。根据以往市政工程中的冻结法施工经验,总结组合式冻结法的施工流程,提出泄压孔、温度限位孔和局部冻结技术相结合的冻胀控制措施,以及利用冻结管嵌入地连墙的界面区强化措施。通过模型试验对组合式冻结法的可行性进行验证,试验结果表明,组合式冻结法可以有效实现基底的支护,在冻结薄弱环节临时竖井、地连墙附近冻结壁承载能力满足设计要求;观测发现地层冻结对地连墙强度和变形无明显影响。

关键词：组合式冻结法基坑工程免降水开挖模型试验冻土止水帷幕

An improved prediction method of subsequent commutation failure of an LCC-HVDC considering sequential control response

在线全文

学校读者我要写书评

暂无评论

Protection and Control of Modern Power Systems 2023年第3期8卷 173-183页

作者： Jinxin Ouyang Xinyu Pan Junjun Ye Chao Xiao Yanbo Diao qingwu zhang State Key Laboratory of Power Transmission Equipment and System Security and New Technology School of Electrical EngineeringChongqing UniversityChongqing 400044China Electric Power Research Institute of State Grid Henan Electric Power Company Zhengzhou 450052China Chongqing City Management College Chongqing 401331China NR Electric Co. LtdNanjing 211100China

Subsequent commutation failure(SCF)can be easily generated during the first commutation failure(CF)recovery process in a line-commutated converter-based high voltage direct-current *** poses a significant threat to the safe and stable operation of power systems,and accurate prediction of CF is thus ***,SCF is affected by the operating characteristics of the main circuit and the coupling effects of sequential control response in the inverter *** are difficult to predict *** this paper,a new SCF prediction method considering the control response is proposed based on the physical principle of *** time sequence and switching conditions of the controllers at different stages of the first CF recovery process are described,and the corresponding equations of commutation voltage affected by different controllers are *** calculation method of the SCF threshold voltage is proposed,and the prediction method is *** show that the proposed method can predict SCF accurately and provide useful tools to suppress SCF.

关键词： Line-commutated converter based high-voltage direct-current(LCC-HVDC) Subsequent commutation failure(SCF) Converter station Prediction

A Comparative Study of Electrochemical Capacitance of Graphene Oxide Affected by Oligomers of p-phenylenediamine and Hydrazine Hydrate in Solvothermal Condition

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2020年第2期35卷 253-262页

作者： zhang Qingqing zhang qingwu LU Hao WANG Wei FANG Tian LIU Hongying LIU Jiaji WANG Shuangshuang School of Chemical&Environmental Engineering China University of Mining&TechnologyBeijing 100083China

A systematic investigation of the graphene oxide composite reduced by either p-phenylenediamine oligomers or hydrazine hydrate was performed with field emission scanning electron microscopy,high resolution transmission electron microscopy,X-ray diffraction,fourier transform infrared,and X-ray photoelectron spectroscopy *** electrical capacitance of the composite was evaluated by a cyclic voltammetry technique,while the properties of these prototype supercapacitors were measured by a chronopotentiometry *** was found that,under the solvothermal condition,the graphene oxide reduced by p-phenylenediamine oligomers was observed to have higher electrical capacitance than that reduced by *** improved electrical capacitance can be attributed to that p-phenylenediamine oligomers are the more effective spacers for graphene layers;and they could also provide some pseudo-capacitance to the graphene oxide composite based on their conjugate *** results imply that graphene oxide modified by diamine oligomers has a good potential in energy storage devices.

关键词： oligomers p-phenylenediamine graphene oxide hydrazine supercapacitors

Effects of coal rank, Fe_3O_4 amounts and activation temperature on the preparation and characteristics of magnetic activated carbon

在线全文

学校读者我要写书评

暂无评论

Mining Science and Technology 2010年第6期20卷 872-876页

作者： YANG Mingshun XIE Qiang zhang Jun LIU Juan WANG Yan zhang Xianglan zhang qingwu School of Chemical and Environmental Engineering China University of Mining ＆ Technology Beijing 100083 China

Coal-based Magnetic Activated Carbons （CMAC＇s） were prepared from three representative coal samples of various ranks： Baorigele lignite from Inner Mongolia; Datong bitumite from Shanxi province; and Taixi anthracite from Ningxia Hui Auto- nomous Region. Fe3O4 was used as a magnetic additive. A nitrogen-adsorption analyzer was used to determine the specific surface area and pore structure of the resulting activated carbons. The adsorption capacity was assessed by the adsorption of iodine and methylene blue. X-ray diffraction was used to measure the evolution behavior of Fe304 during the preparation process. Magnetic properties were characterized with a vibrating-sample magnetometer. The effect of the activation temperature on the performance of CMAC＇s was also studied. The results show that, compared to Baorigele lignite and Taixi anthracite, the Datong bitumite is more appropriate for the preparation of CMAC＇s with a high specific surface area, an advanced pore structure and suitable magnetic properties. Fe304 can effectively enhance the magnetic properties and control the pore structure by increasing the ratio of meso- pores. An addition of 6.0% Fe304 and an activation temperature of 880 ℃ produced a CMAC having a specific surface area, an iodine adsorption, a methylene blue adsorption and a specific saturation magnetization of 1152.0 m2/g, 1216.7 mg/g, 229.5 mg/g and 4.623 emu/g, respectively. The coal used to prepare this specimen was Datong bitumite.

关键词： magnetic activated carbon coal rank Fe304 activation temperature

羟基化玻璃纤维增强SiO_(2)气凝胶的制备及性能

在线全文

学校读者我要写书评

暂无评论

南京工业大学学报（自然科学版） 2024年第3期46卷 281-289页

作者：时钒展望李丽霞绪志远尤杰张庆武陈乐孔庆红陈明毅江苏大学环境与安全工程学院江苏镇江212013 南京工业大学材料科学与工程学院江苏南京211800 南京工业大学安全科学与工程学院江苏南京211800 南京大学电子科学与工程学院江苏南京210046

采用羟基化的玻璃纤维作为增强体来提升SiO_(2)气凝胶力学性能。通过正交实验确定最优工艺参数,对比研究玻璃纤维羟基化以及纤维添加量和长度对SiO_(2)气凝胶的影响,并研究其影响机制。结果表明:最佳成分比所得SiO_(2)气凝胶的孔隙率达... 详细信息

采用羟基化的玻璃纤维作为增强体来提升SiO_(2)气凝胶力学性能。通过正交实验确定最优工艺参数,对比研究玻璃纤维羟基化以及纤维添加量和长度对SiO_(2)气凝胶的影响,并研究其影响机制。结果表明:最佳成分比所得SiO_(2)气凝胶的孔隙率达到97.34%,羟基化玻璃纤维能够有效提高SiO_(2)气凝胶的力学性能,且当添加质量分数为5%,短纤维(3 mm)与长纤维(10 mm)质量比为2∶8时,SiO_(2)气凝胶导热系数为0.0284 W/(m·K),抗压强度达到0.37 MPa。

关键词： SiO_(2)气凝胶玻璃纤维力学性能导热系数轻质多孔

The energy-free purification of trace thallium(I)-contaminated potable water using a high-selective filter paper with multi-layered Prussian blue decoration

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2024年第2期18卷 1-12页

作者： Jiangyan Lu Zhu Xiong Yuhang Cheng qingwu Long Kaige Dong Hongguo zhang Dinggui Luo Li Yu Wei zhang Gaosheng zhang Key Laboratory for Water Quality and Conservation of the Pearl River Delta(Ministry of Education) School of Environmental Science and EngineeringGuangzhou UniversityGuangzhou 510006China College of Light Chemical Industry and Materials Engineering Shunde PolytechnicFoshan 528333China

Thallium is a highly toxic metal,and trace amount of thallium(I)(Tl+)in potable water could cause a severe water crisis,which arouses the exploitation of highly-effective technology for purification of Tl+contaminated *** report proposes the multi-layered Prussian blue(PB)-decorated composite membranes(PBx@PDA/PEI-FP)based on the aminated filter papers for Tl+*** characterization by Fourier transform infrared spectrometer-attenuated total reflectance,scanning electron microscope,thermogravimetric analysis,X-ray photoelectron spectroscopy and X-ray diffraction were performed to confirm the in situ growth of cubic PB crystals on filter paper membrane surfaces via the aminated layers,and the successful fabrication of multi-layered PB overcoats via the increasing of aminated *** effect of PB layers on Tl+removal by PBx@PDA/PEI-FP from simulated drinking water was evaluated as well as the influence of different experimental conditions.A trade-off between PB decoration layer number and PB distribution sizes is existed in Tl+uptake by PBx@PDA/*** double-layered PB2@PDA/PEI-FP membrane showed the maximum sorption capacity,but its Tl+uptake performance was weakened by the acid,coexisting ions(K+and Na+)and powerful operation pressure,during filtrating a large volume of low-concentrated Tl+-containing ***,the negative effect of coexisting ions on the Tl+uptake could be effectively eliminated in weak alkaline water,and the Tl+removal was increased up to 100%without any pressure driving for PB2@PDA/PEI-FP *** importantly,PB2@PDA/PEI-FP displayed the high-efficiency and high-selectivity in purifying the Tl+-spiked Pearl River water,in which the residual Tl+in filtrate was less than 2μg·L^(–1) to meet the drinking water standard of United States Environmental Protection *** work provides a feasible avenue to safeguard the drinking water in remote and underdeveloped area via the energy-free operation.

关键词： membrane adsorption Prussian blue energy-free filtration potable water trace thallium(I)

Strategic Research on China＇s Enterprises Green Logistics

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Business Review 2006年第1期5卷 5-7,20页

作者： Ruifeng zhang qingwu Zou

Based on the principle of sustainable development, this paper analyzes the connotation of green logistics, and the problems in the development and the system in China. It also puts forward the strategy in the implemen... 详细信息

关键词： enterprise green logistics sustainable development