检索范围:
排序: 展示方式:
A review of nondestructive examination technology for polyethylene pipe in nuclear power plant
Jinyang ZHENG, Yue ZHANG, Dongsheng HOU, Yinkang QIN, Weican GUO, Chuck ZHANG, Jianfeng SHI
《机械工程前沿(英文)》 2018年 第13卷 第4期 页码 535-545 doi: 10.1007/s11465-018-0515-9
Polyethylene (PE) pipe, particularly high-density polyethylene (HDPE) pipe, has been successfully utilized to transport cooling water for both non-safety- and safety-related applications in nuclear power plant (NPP). Though ASME Code Case N755, which is the first code case related to NPP HDPE pipe, requires a thorough nondestructive examination (NDE) of HDPE joints. However, no executable regulations presently exist because of the lack of a feasible NDE technique for HDPE pipe in NPP. This work presents a review of current developments in NDE technology for both HDPE pipe in NPP with a diameter of less than 400 mm and that of a larger size. For the former category, phased array ultrasonic technique is proven effective for inspecting typical defects in HDPE pipe, and is thus used in Chinese national standards GB/T 29460 and GB/T 29461. A defect-recognition technique is developed based on pattern recognition, and a safety assessment principle is summa-rized from the database of destructive testing. On the other hand, recent research and practical studies reveal that in current ultrasonic-inspection technology, the absence of effective ultrasonic inspection for large size was lack of consideration of the viscoelasticity effect of PE on acoustic wave propagation in current ultrasonic inspection techno-logy. Furthermore, main technical problems were analyzed in the paper to achieve an effective ultrasonic test method in accordance to the safety and efficiency requirements of related regulations and standards. Finally, the development trend and challenges of NDE test technology for HDPE in NPP are discussed.
关键词: polyethylene pipe nuclear power plant ultrasonic inspection nondestructive testing safety assessment
Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes
Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ
《结构与土木工程前沿(英文)》 2020年 第14卷 第1期 页码 147-168 doi: 10.1007/s11709-019-0587-6
关键词: Ansys software polyethylene buried pipelines polyethylene joints polyethylene patches peak von Mises stress soil-pipe interaction temperature variation
Conversion of polyethylene to gasoline: Influence of porosity and acidity of zeolites
《能源前沿(英文)》 页码 763-774 doi: 10.1007/s11708-023-0897-1
关键词: plastics conversion polyethylene zeolites acidity porosity
王璇,冀星,李术元
《中国工程科学》 2001年 第3卷 第12期 页码 90-95
废旧塑料的回收利用是近年来治理环境污染的一个重要课题。废聚乙烯(PE)在塑料垃圾中占有很大的比例,如何对其进行合理的回收、利用已成为人们十分关心的问题。从理论和经济两方面分析了废聚乙烯裂解制取聚乙烯蜡技术的可行性,介绍了聚乙烯蜡的性能及市场情况,分析比较了几种有代表性的制蜡工艺,综合评价了这些工艺技术的应用范围和优缺点。还简要介绍了红外脱油技术,并对该技术的研究和应用方向提出了一些建议。
Major applications of heat pipe and its advances coupled with sorption system: a review
Yang YU, Guoliang AN, Liwei WANG
《能源前沿(英文)》 2019年 第13卷 第1期 页码 172-184 doi: 10.1007/s11708-019-0610-6
关键词: heat pipe sorption system heat transfer solid sorption heat pipe
Ehsan Salehi, Fereshteh Soroush, Maryam Momeni, Aboulfazl Barati, Ali Khakpour
《化学科学与工程前沿(英文)》 2017年 第11卷 第4期 页码 575-585 doi: 10.1007/s11705-017-1650-2
关键词: carbon biocomposites impregnation chitosan polyethylene glycol image processing
Design and analyses of open-ended pipe piles in cohesionless soils
Yuan GUO,Xiong (Bill) YU
《结构与土木工程前沿(英文)》 2016年 第10卷 第1期 页码 22-29 doi: 10.1007/s11709-016-0314-5
Group-based multiple pipe routing method for aero-engine focusing on parallel layout
《机械工程前沿(英文)》 2021年 第16卷 第4期 页码 798-813 doi: 10.1007/s11465-021-0645-3
关键词: multiple pipe routing optimization algorithm aero-engine pipe grouping parallel layout
RUN Mingtao, SONG Hongzan, WANG Yingjin, YAO Chenguang, GAO Jungang
《化学科学与工程前沿(英文)》 2007年 第1卷 第3期 页码 238-245 doi: 10.1007/s11705-007-0043-3
关键词: /metallocene polyethylene presence rheological phenomena trimethylene terephthalate
《环境科学与工程前沿(英文)》 2023年 第17卷 第1期 doi: 10.1007/s11783-023-1606-3
● Reducting the sampling frequency can enhance the modelling process.
关键词: HDPE Pyrolysis Kinetics Thermogravimetric ANOVA Artificial neural network
Calculation method of load distribution on pipe threaded connections under tension load
Shoujun CHEN, Lianxin GAO, Qi AN
《机械工程前沿(英文)》 2011年 第6卷 第2期 页码 241-248 doi: 10.1007/s11465-011-0219-x
This paper presents a new calculation method that can calculate the load distribution on pipe threaded connections under tension load. On the basis of elastic mechanics, the new method was developed by analyzing each thread tooth, and a new deformation and covariant equation by making a mechanics analysis on each thread tooth was obtained. Compared with the traditional method proposed by the previous references, the new deformation and covariant equation could be used to describe the relation between the previous and the next thread tooth. By applying the new method on the sample of P-110S pipe threaded connection, the obtained results show that the load on thread tooth mainly concentrates on the four or five threads engaged and the middle teeth were not utilized well to bear the loads. The model offers a new way to calculate the loads carried on the thread teeth under tension load.
关键词: load distribution calculation method pipe threaded connections tension load
NC flame pipe cutting machine tool based on open architecture CNC system
Xiaogen NIE, Yanbing LIU
《机械工程前沿(英文)》 2009年 第4卷 第2期 页码 147-152 doi: 10.1007/s11465-009-0025-x
关键词: flame pipe cutting flame incision tracks CNC open architecture CNC system
《化学科学与工程前沿(英文)》 2023年 第17卷 第12期 页码 2074-2087 doi: 10.1007/s11705-023-2342-8
关键词: poly(lactic acid) foaming microfibrillation rheological property crystallization
Branch-pipe-routing approach for ships using improved genetic algorithm
Haiteng SUI,Wentie NIU
《机械工程前沿(英文)》 2016年 第11卷 第3期 页码 316-323 doi: 10.1007/s11465-016-0384-z
Branch-pipe routing plays fundamental and critical roles in ship-pipe design. The branch-pipe-routing problem is a complex combinatorial optimization problem and is thus difficult to solve when depending only on human experts. A modified genetic-algorithm-based approach is proposed in this paper to solve this problem. The simplified layout space is first divided into three-dimensional (3D) grids to build its mathematical model. Branch pipes in layout space are regarded as a combination of several two-point pipes, and the pipe route between two connection points is generated using an improved maze algorithm. The coding of branch pipes is then defined, and the genetic operators are devised, especially the complete crossover strategy that greatly accelerates the convergence speed. Finally, simulation tests demonstrate the performance of proposed method.
关键词: branch pipe ship industry piping system optimization algorithm
Augmented hydrogen production by gasification of ball milled polyethylene with Ca(OH)
Giovanni Cagnetta, Kunlun Zhang, Qiwu Zhang, Jun Huang, Gang Yu
《环境科学与工程前沿(英文)》 2019年 第13卷 第1期 doi: 10.1007/s11783-019-1096-5
PE ball milling pretreatment induces higher H2 production and purity by gasification. Ca(OH)2 reacts at solid state with PE boosting H2 and capturing CO2. Ca(OH)2 significantly reduces methanation side-reaction.
关键词: Hydrogen production Gasification Plastic waste High energy ball milling
标题 作者 时间 类型 操作
A review of nondestructive examination technology for polyethylene pipe in nuclear power plant
Jinyang ZHENG, Yue ZHANG, Dongsheng HOU, Yinkang QIN, Weican GUO, Chuck ZHANG, Jianfeng SHI
期刊论文
Investigating peak stresses in fitting and repair patches of buried polyethylene gas pipes
Reza KHADEMI ZAHEDI, Pouyan ALIMOURI, Hooman KHADEMI ZAHEDI, Mohammad SHISHESAZ
期刊论文
Major applications of heat pipe and its advances coupled with sorption system: a review
Yang YU, Guoliang AN, Liwei WANG
期刊论文
Chitosan/polyethylene glycol impregnated activated carbons: Synthesis, characterization and adsorption
Ehsan Salehi, Fereshteh Soroush, Maryam Momeni, Aboulfazl Barati, Ali Khakpour
期刊论文
terephthalate)/ethylene propylene diene monomer copolymer grafted with maleic anhydride/metallocene polyethylene
RUN Mingtao, SONG Hongzan, WANG Yingjin, YAO Chenguang, GAO Jungang
期刊论文
Prediction of high-density polyethylene pyrolysis using kinetic parameters based on thermogravimetric
期刊论文
Calculation method of load distribution on pipe threaded connections under tension load
Shoujun CHEN, Lianxin GAO, Qi AN
期刊论文
NC flame pipe cutting machine tool based on open architecture CNC system
Xiaogen NIE, Yanbing LIU
期刊论文
Effect of polyethylene glycol on the crystallization, rheology and foamability of poly(lactic acid) containing
期刊论文