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An analysis of dimethyl ether synthesis from syngas 合成气合成二甲醚的分析
Journal of Engineering Sciences and Innovation Pub Date : 2021-09-17 DOI: 10.56958/jesi.2021.6.3.4
G. Bozga, Gh. Ivanus, I. Banu
{"title":"An analysis of dimethyl ether synthesis from syngas","authors":"G. Bozga, Gh. Ivanus, I. Banu","doi":"10.56958/jesi.2021.6.3.4","DOIUrl":"https://doi.org/10.56958/jesi.2021.6.3.4","url":null,"abstract":"The dimethyl ether (DME) is an environmentally friendly fuel, that can replace succesfully the petroleum Diesel in engines, or the LPG fuel. In the last period, the world production of DME was steadily rising, with annual rates of 5-8%. The actual commercial technologies producing DME are based on the methanol etherification (the two-step process). An important research effort was expensed in last decennia, in the development of technologies transforming directly the synthesis gas into DME, without separation of the intermediary methanol (the direct or one-step process). This work presents data related to the direct DME synthesis technologies from synthesis gas, thermodynamic particularities of the chemical process and design issues of multi-tubular fixed bed catalytic reactor for gas phase DME synthesis. It is proposed a new constructive solution of the synthesis reactor, with the reactor divided in multiple zones, having distinct catalyst compositions and cooling characteristics. The simulation calculations evidenced the important increase in DME production that can be achieved by this constructive solution, as consequence of an improved control of process evolution along the catalytic reactor.","PeriodicalId":52936,"journal":{"name":"Journal of Engineering Sciences and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45663263","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
FEM analysis of Storz coupling Storz联轴器的有限元分析
Journal of Engineering Sciences and Innovation Pub Date : 2021-09-17 DOI: 10.56958/jesi.2021.6.3.3
G. Ojoc, C. Băbuţ, N. Ungureanu, L. Deleanu
{"title":"FEM analysis of Storz coupling","authors":"G. Ojoc, C. Băbuţ, N. Ungureanu, L. Deleanu","doi":"10.56958/jesi.2021.6.3.3","DOIUrl":"https://doi.org/10.56958/jesi.2021.6.3.3","url":null,"abstract":"This paper presents an isothermal model of Storz coupling used in fire hose coupling. The model has the actual geometry of the coupling Fire and Rescue NSW for the nominal diameter of 65 mm (NEN 3374). The simulation was done for a load interval on the coupling (from F=2 kN for an actual value of water pressure, to extreme conditions with F=3 kN and 6 kN when the coupling fails under load). The stress and strain distributions point out the stress concentrators and the maximum values of von Mises stress in order to compare them to the material limit. The coupling is made of aluminum alloy EN AW6082 (AlSi1MgMn), treatment T6 (solution heat treated, quenched and artificially aged). Bottom surface of one half-coupling is fixed and the upper surface of the other half-coupling is loaded with a tensile force, uniformly distributed on surface. The constitutive model of the material is bilinear with Young modulus of 71000 MPa, Poisson ration 0.33, yield limit of 280 MPa, ultimate tensile strength 310 MPa and plastic equivalent strain 0.14.","PeriodicalId":52936,"journal":{"name":"Journal of Engineering Sciences and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48018038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A procedure for rating the dam safety improvement works 一种评定大坝安全改进工程等级的程序
Journal of Engineering Sciences and Innovation Pub Date : 2021-09-17 DOI: 10.56958/jesi.2021.6.3.9
D. Stematiu, R. Drobot
{"title":"A procedure for rating the dam safety improvement works","authors":"D. Stematiu, R. Drobot","doi":"10.56958/jesi.2021.6.3.9","DOIUrl":"https://doi.org/10.56958/jesi.2021.6.3.9","url":null,"abstract":"Among the dam portofoliu administrated by an owner some dams show behaviour anomalies, progressive adverse phenomena or deficiencies of the equipment. The owner develops studies establishing the causes of the found phenomena and designs of the rehabilitation works for deficiencies remedy. Financing of the rehabilitation projects, sometimes requiring high costs, is usually provided from the owner’s own funds. Naturally, the funds that can be allotted are limited and very often cannot cover the costs required by all the technically approved works. Under these conditions, the funds distribution strategy should select primarily the works that contribute significantly to the dam’s safety improvement while in the meantime are bringing maximum benefit to the owner. A decision making strategy is developed in the present paper. Planning the rehabilitation works required by safety improvement is based on the combination of risk reduction and the efficiency of the intervention.","PeriodicalId":52936,"journal":{"name":"Journal of Engineering Sciences and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41279422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
The PbO concentration influence on oxides films developed on Incoloy 800 in CANDU secondary circuit conditions CANDU二次回路条件下PbO浓度对Incoloy 800氧化膜形成的影响
Journal of Engineering Sciences and Innovation Pub Date : 2021-09-17 DOI: 10.56958/jesi.2021.6.3.6
Claudia Samarineanu, D. Lucan, Gabriela Tudorache
{"title":"The PbO concentration influence on oxides films developed on Incoloy 800 in CANDU secondary circuit conditions","authors":"Claudia Samarineanu, D. Lucan, Gabriela Tudorache","doi":"10.56958/jesi.2021.6.3.6","DOIUrl":"https://doi.org/10.56958/jesi.2021.6.3.6","url":null,"abstract":"\"The presence of lead compounds in CANDU secondary water circuit contributes to the degradation of nickel alloys involved in critical equipments manufacturing, e.g. steam generator. The pre-oxidated Incoloy 800 specimens (the steam generator tubes material) have been tested in autoclave, in secondary simulated water medium conditions: pH=9.5, at 5.1 MPa presssure and 2600C temperature, in solutions containing 100, 200 and 300 mg/L PbO, the exposure time for each concentration being 10, 20 and 30 days. The specimens evaluation after testing have been realised through ex-situ and in-situ methods: metalography, electrochemistry (potentiodynamic and impedance), gravimetry and scanning electron microscopy with energy dispersive spectroscopy. It is investigated the influence of different PbO concentrations on tested specimens surface morphology (grain, layer thickness, layer composition) and on the corrosion susceptibility, resulting in increased corrosion tendency and loss of protective properties of films as the PbO concentration was higher.\"","PeriodicalId":52936,"journal":{"name":"Journal of Engineering Sciences and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41500587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Stress concentration in the components of a drive coupling 驱动联轴器部件的应力集中
Journal of Engineering Sciences and Innovation Pub Date : 2021-09-17 DOI: 10.56958/jesi.2021.6.3.1
C. Atanasiu, Ș. Sorohan
{"title":"Stress concentration in the components of a drive coupling","authors":"C. Atanasiu, Ș. Sorohan","doi":"10.56958/jesi.2021.6.3.1","DOIUrl":"https://doi.org/10.56958/jesi.2021.6.3.1","url":null,"abstract":"Actuating couplings are used to transmit the torque between the ends of two shafts with or without coaxial deviations. The stress distribution and the stress concentration in a coupling loaded statically by a torque are presented in this paper. The calculation of the stress concentration coefficients in the dynamic stress regime of the machine parts is usually done with relations in whom the stress concentration coefficients in the static regime have a very important weight. For this reason, knowing the values of the stress concentration coefficients in static regime is absolutely necessary. The analysis was made using the finite element method. A calculus methodology is proposed establishing how the loads are applied and how the anti-symmetry of loading is taken into account when boundary conditions are imposed. The influence of the free space between the shaft and the sleeve on the stress field in these two parts is analysed thought the values of the stress concentration coefficient.","PeriodicalId":52936,"journal":{"name":"Journal of Engineering Sciences and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48972975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The limitations of energy accessibility, the irreversibility and two transdisciplinary principles 能源可及性的局限性、不可逆性和两个跨学科原则
Journal of Engineering Sciences and Innovation Pub Date : 2021-09-17 DOI: 10.56958/jesi.2021.6.3.11
V. Jinescu
{"title":"The limitations of energy accessibility, the irreversibility and two transdisciplinary principles","authors":"V. Jinescu","doi":"10.56958/jesi.2021.6.3.11","DOIUrl":"https://doi.org/10.56958/jesi.2021.6.3.11","url":null,"abstract":"The ability to produce motion based on man-made energy is essential to the civilization. Equally important is the most efficient use of energy to limit the consumption of natural resources as well as the resulting pollution. Consequently, it is necessary to know: - the factors that limit the energy accessibility; - the physical bases of irreversibility, as a premise of ensuring the maximum efficiency. The paper presents two new transdisciplinary principles: - the principle of energy accessibility, which introduces the concepts of degree of energy accessibility, degree of energy inaccessibility caused by natural conditions and degree of energy inaccessibility induced by technical conditions; - the principle of irreversibility which introduces the concept of degree of energy irreversibility in correlation with the physical bases of irreversibility.","PeriodicalId":52936,"journal":{"name":"Journal of Engineering Sciences and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45164080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
BEM simulation on the influence of dispersion currents on buried pipes 色散电流对埋地管道影响的边界元模拟
Journal of Engineering Sciences and Innovation Pub Date : 2021-09-17 DOI: 10.56958/jesi.2021.6.3.10
Adriana Tudor, R. Ripeanu
{"title":"BEM simulation on the influence of dispersion currents on buried pipes","authors":"Adriana Tudor, R. Ripeanu","doi":"10.56958/jesi.2021.6.3.10","DOIUrl":"https://doi.org/10.56958/jesi.2021.6.3.10","url":null,"abstract":"The aim of this paper is to provide a method for modelling the influence of stray currents on buried pipes, using as calculation the boundary element method (BEM), using the module dedicated to corrosion in COMSOL Multiphysics software, which allows investigation both macroscopically and microscopically of corrosion processes. Dispersion currents, often called stray currents, are considered currents that follow little-known trajectories in the ground, but which can affect underground gas pipelines. Their sources are external to the pipes and contribute to the lowering of the anodic potential up to values to which the accelerated anodic dissolution of the metal occurs. For the simulation, the geometric modelling of a soil cube was used, in which pipes of different sizes are inserted, protected or not by a polyethylene protection state, in different positions and different burial depths. Using a calculation algorithm that is based on the boundary element method, the dynamics of the cathodic protection for the buried gas pipes in the presence of stray currents can be modelled.","PeriodicalId":52936,"journal":{"name":"Journal of Engineering Sciences and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46399366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Aspects regarding the preparation methods of anionic clays 关于阴离子粘土的制备方法的方面
Journal of Engineering Sciences and Innovation Pub Date : 2021-09-17 DOI: 10.56958/jesi.2021.6.3.8
Diana Paleu, I. Nistor
{"title":"Aspects regarding the preparation methods of anionic clays","authors":"Diana Paleu, I. Nistor","doi":"10.56958/jesi.2021.6.3.8","DOIUrl":"https://doi.org/10.56958/jesi.2021.6.3.8","url":null,"abstract":"Anionic clays, layered double hydroxides, are natural or synthetic materials that have special properties, especially regarding their retention capacity. This quality is due to their lamellar structure, formed by parallel planes, different molecules of interest could be intercalated between them. This allows the use of anionic clays in various fields such as: chemical industry, food industry, pharmaceutical and medical industry, as well as environmental protection. The paper presents important aspects regarding their preparation possibilities.","PeriodicalId":52936,"journal":{"name":"Journal of Engineering Sciences and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45560612","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Technological design elements for pulsed extraction columns with sieve trays 带筛板的脉冲萃取柱的工艺设计要点
Journal of Engineering Sciences and Innovation Pub Date : 2021-09-17 DOI: 10.56958/jesi.2021.6.3.5
C. Jinescu
{"title":"Technological design elements for pulsed extraction columns with sieve trays","authors":"C. Jinescu","doi":"10.56958/jesi.2021.6.3.5","DOIUrl":"https://doi.org/10.56958/jesi.2021.6.3.5","url":null,"abstract":"Solvent extraction process is frequently used to obtain chemical compounds used in the nuclear field. In order to make nuclear energy a safe, clean and cheap energy source, one has resorted to the identification of new, innovative methods in the immediate transfer of the laboratory results to an industrial scale. A method is described for the design of liquid extraction columns by scaling up from the results of small scale plant tests. Such a method was applied for scaling up a pulsed column with sieve trays using the dimensions of an experimental model column. The scale-up method is based on the assumption that the height of the column is independent of column diameter, and that increased backmixing accounts entirely for differences in performance on small and large scales. This paper uses the results obtained on an experimental model column for the purpose of designing a high capacity column. The final result consists in determining the diameter and height of a scaled up column by using like parameter the number of transfer units corresponding to a compartment, a value that will stay the same for the laboratory-scale column and for the large-scale (pilot or industrial) column.","PeriodicalId":52936,"journal":{"name":"Journal of Engineering Sciences and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41541466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tackling wellbore difficulties for drilling deviated andhorizontal wells 解决斜井和水平井钻井的井眼难题
Journal of Engineering Sciences and Innovation Pub Date : 2021-05-17 DOI: 10.56958/jesi.2021.6.2.8
Ayham Mhanna, Mohamed Halafawi, L. Avram
{"title":"Tackling wellbore difficulties for drilling deviated andhorizontal wells","authors":"Ayham Mhanna, Mohamed Halafawi, L. Avram","doi":"10.56958/jesi.2021.6.2.8","DOIUrl":"https://doi.org/10.56958/jesi.2021.6.2.8","url":null,"abstract":"Future development plans are often being continued during production. These plans includes wells repair, reservoir enhancements, or new development wells in order to increase the field production. Therefore, the main objective of this paper is to tackle deviated and horizontal wellbore difficulties in GOF field. Specific drilling hole problems are addressed and reviewed. Additionally, proposed solutions are suggested to improve wellbore stability and select the appropriate hole cleaning drilling practices, based on offset data for drilling the new development wells of Gulf Offshore Field (GOF) without instability difficulties. Overview of this field is discussed including geological column, wells locations, and contour maps. Offset wells data are completely analyzed. Drilling fluids are selected with their properties that avoid wellbore obstructions. Moreover, deviated and horizontal trajectories are optimized for the new development wells. Finally, the best drilling practices are hence recommended","PeriodicalId":52936,"journal":{"name":"Journal of Engineering Sciences and Innovation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43466270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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