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Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering最新文献

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Chemical inhibitors as potential allied for CO2 replacement in gas hydrates reservoirs: sodium chloride case study 化学抑制剂作为天然气水合物储层中二氧化碳替代的潜在盟友:氯化钠案例研究
A. Gambelli, B. Castellani, M. Filipponi, A. Nicolini, F. Rossi
In previous experimental works we proved how the presence of sodium chloride may influence the replacement of methane contained into hydrate with carbon dioxide. Even if its chemical inhibitor effect is well known and documented in literature, the possibility of having different behaviours in function of the gaseous species involved in hydrate formation has not been explored. The first step of our research proved how NaCl inhibitor effect is more pronounced in methane hydrate formation rather than carbon dioxide one. That leads to a higher difference between temperature-pressure conditions describing the two species equilibrium curves and, thus, to greater possibilities of intervening in the replacement process in order to perform it and increasing both the amount of methane recovered and the quantity of carbon dioxide permanently stored. Two replacement tests were carried out in presence of 40 g/l of salt dissolved in water; then results were compared with two other tests previously realized with the same experimental apparatus but using pure demineralised water. The inhibitor effect of sodium chloride is well visible in the significantly lower quantity of methane hydrate formed in the first phase of tests. The same effect was observed during the carbon dioxide formation step, but its intensity was lower. In conclusion the use of NaCl led to a higher percentage of methane recovered and carbon dioxide stored, even if both quantities are lower than the respective value reached in tests carried out using demineralised water.
在以前的实验工作中,我们证明了氯化钠的存在如何影响甲烷被二氧化碳取代为水合物。即使它的化学抑制作用是众所周知的,并在文献中有记载,但在水合物形成过程中,气态物质在功能上的不同行为的可能性尚未被探索。我们研究的第一步证明了NaCl抑制剂的作用在甲烷水合物的形成中比在二氧化碳水合物的形成中更明显。这导致了描述两种物种平衡曲线的温度-压力条件之间的较大差异,因此,为了执行替换过程而干预替换过程的可能性更大,并且增加了回收的甲烷量和永久储存的二氧化碳量。在水中溶解40克/升盐的情况下进行了两次替代试验;然后将结果与先前使用相同实验设备但使用纯去矿化水进行的其他两个测试进行比较。氯化钠的抑制作用在试验第一阶段形成的甲烷水合物数量明显减少中很明显。在二氧化碳形成阶段也观察到同样的效应,但其强度较低。总之,NaCl的使用提高了甲烷的回收率和二氧化碳的储存量,即使这两个量都低于使用去矿化水进行的试验所达到的相应值。
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引用次数: 5
Analytic Approaches for the Transient Temperature Distribution in a Single Cable for Smart Fuses and Ampacity Derating Calculation 智能熔断器单电缆瞬态温度分布的解析方法及降额计算
Anika Henke, S. Frei
To protect cables from damage by too high temperatures, classically fuses are used. Those often lead to over-dimensioned cables due to their melting behaviour or simple tripping strategies. Therefore, smart fuses can be advantageous. Here, a more powerful control circuit can estimate the cable temperature and operate as switch, when the temperature exceeds a given limit. The control circuit needs to run a thermal simulation of the cable to be protected. Critical temperatures can be detected this way. Thermal cable models can be very complex and computationally intensive, especially when numerical methods are used. In this contribution, a new analytic approach for the transient axial temperature distribution along a single cable is presented. Using this solution, a significant reduction of the time needed for calculation is achieved.
为了防止电缆因温度过高而损坏,通常使用保险丝。这些通常会导致电缆尺寸过大,因为它们的熔化行为或简单的脱扣策略。因此,智能保险丝可能是有利的。在这里,一个更强大的控制电路可以估计电缆的温度,并作为开关,当温度超过给定的限制。控制电路需要对要保护的电缆进行热模拟。可以用这种方法检测临界温度。热电缆模型是非常复杂和计算密集的,特别是当使用数值方法时。在这篇贡献中,提出了一种新的分析方法来分析沿单根电缆的瞬态轴向温度分布。使用此解决方案,可以显著减少计算所需的时间。
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引用次数: 0
Surface Tension Model for Free-Surface Problems in SPH SPH自由表面问题的表面张力模型
P. Jančík, T. Hyhlík
This paper presents a surface tension model for Smoothed Particle Hydrodynamics. This model originates from previously published models based on the Continuum Surface Force approach. Its main feature is how it deals with the free surface, where particles suffer from particle deficiency. The model is tested in two dimensions using oscillating and static cylindrical rod problems. Its sensitivity to spatial resolution was evaluated, and some of the model's features discovered. Overall, the model seems to provide accuracy sufficient for most practical applications.
本文提出了光滑粒子流体力学的表面张力模型。该模型源自先前发表的基于连续体表面力方法的模型。它的主要特点是如何处理自由表面,在自由表面,粒子遭受粒子缺陷。采用振荡和静态圆柱杆问题对模型进行了二维测试。评估了该模型对空间分辨率的敏感性,并发现了该模型的一些特征。总的来说,该模型似乎为大多数实际应用提供了足够的准确性。
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引用次数: 0
Thermal Analysis and Climate Control of Experimental two-level Hydroponic Growth Cell 实验两级水培生长细胞的热分析与气候控制
H. Vitoshkin, V. Haslavsky
The research focuses on providing optimal conditions for growth, energy efficiency, and sustainability, controlled and autonomous environment. A two-level hydroponic growth cell is proposed as an experimental facility to design of in-door multilayer plant production systems. The goal of the system is to serve as a practical and useful alternative to traditional field agriculture. The growth cell has of 1 m each level area and composites two rows of hydroponic growth elements. The cell is designed to carry out multiple functions essential to sustain plant growth that includes: water circulation, nutrients delivery, environment sensing, ventilation, and artificial selective lighting. The series of repeated growth cycles have been successfully performed and compared against a conventional greenhouse facility using lettuce as a model crop. The factors such as inside temperature and humidity, leaf temperature, illumination under three different lighting types: white light, red-blue light, sunlight were monitored and maintained by a developed control system. Light distribution (photosynthetic active radiation) and yield (leaf size and fresh weight) were assessed. It is shown that sunlight is the more profitable type of lighting for lettuce crops even under warm outside environmental conditions. These results illustrate that the use of transparent covering materials offer great potential for energy save cultivation and should be considered for a plant-factory design.
研究的重点是为增长、能源效率和可持续性、受控和自主环境提供最佳条件。提出了一种两层水培生长细胞作为室内多层植物生产系统设计的实验装置。该系统的目标是作为传统田间农业的一种实用和有用的替代方案。生长细胞每层面积1 m,由两排水培生长单元组成。细胞被设计为执行维持植物生长所必需的多种功能,包括:水循环、营养输送、环境感知、通风和人工选择性照明。一系列重复的生长周期已经成功地进行了,并与使用生菜作为模式作物的传统温室设施进行了比较。在白光、红蓝光和日光三种不同照明类型下,对室内温湿度、叶温、照度等因素进行了监测和控制。评估光分布(光合有效辐射)和产量(叶片大小和鲜重)。研究表明,即使在温暖的外部环境条件下,阳光也是生菜作物更有利的照明类型。这些结果表明,使用透明覆盖材料具有巨大的节能栽培潜力,应考虑在植物-工厂设计中使用。
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引用次数: 2
Exact Analytical Solution for Two-Dimensional Heat Transfer Equation through a Packed Bed Reactor 填料床反应器二维传热方程的精确解析解
M. Abdulrahman
Heat transfer through packed bed reactors with chemical reactions can play a crucial role in determining the performance of such systems. To explain the effects of temperatures profiles on packed bed reactors, an exact analytical model has been derived by using Hankel and Laplace transform methods. The analysis is based on a transient two-dimensional model of cylindrical coordinates in which the energy equation is solved to yield the transient parameters of a packed bed flow. The model has been used to investigate the axial, radial and time temperature profiles and the effects of superficial velocity on the analytical solution. Comparisons with the experimental results and previous works are presented and show reasonable agreement with the analytical results. The model can be used to derive simple operating maps that would help to identify the effects heat transfer parameters on axial, radial and time temperature profiles.
通过填充床反应器进行化学反应的传热在决定这类系统的性能方面起着至关重要的作用。为了解释温度分布对填料床反应器的影响,采用汉克尔变换和拉普拉斯变换方法推导了一个精确的解析模型。该分析基于柱坐标的二维瞬态模型,通过求解能量方程得到充填床流的瞬态参数。该模型用于研究轴向、径向和时间温度分布以及表面速度对解析解的影响。并与实验结果和前人的工作进行了比较,结果与分析结果基本一致。该模型可用于推导简单的操作图,以帮助确定传热参数对轴向、径向和时间温度分布的影响。
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引用次数: 3
Study of the geomechanical behaviour of different saline typologies in the Catalan basin 加泰罗尼亚盆地不同盐碱类型地质力学行为研究
Nor Sidki, M. Bascompta, L. Sanmiquel
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引用次数: 0
Developing an Integrated Cattle Farm on Ex-coal Mining Area 发展原矿区综合养牛场
T. Yunanto, F. Amanah, Doddy Herika
Mining companies are required to carry out reclamation process. Reclamation on ex-coal mining area has an opportunity to be functioned as Integrated Cattle Farm (ICF) as it is stated in Good Mining Practice Implementation Guidelines in Indonesia. The ICF aims to elaborate surrounding community development projects and empower domestic cattle beef. In addition, beef import is still conducted to meet domestic beef demand. However, some strategies have been arranged including extended livestock area project. As a preliminary study, this project aims to review the possibility of cattle farm development on ex-mining area from the weight increment and birth rate of cattle. The data was taken from PT Berau Coal, East Kalimantan Province, Indonesia and analysed using descriptive statistics. The results showed that the birth rates are: Brahman cross cattle (65%); Bali cattle (42%); and Donggala cattle (94%). Based on the farming system, the highest mean of Brahman cross cattle weight gain on the intensive farming (zero grazing) was 0.43 kg/day and 0.22 kg/day on the semi-intensive farming (grazing). To prepare ICF as community livelihood in the mine closure, some strategies need to be applied due to weight gain improvement. For commercial purposes of beef cattle, male cattle are better selected than female cattle. This project however improves capability and independency of the community from the training program. Moreover, ICF can be endorsed as sustainability of natural resources management from coal mine closure.
矿业公司被要求进行复垦过程。如印度尼西亚良好采矿规范执行准则所述,前煤矿矿区的复垦有机会成为综合养牛场。ICF旨在制定周边社区发展项目,并赋予国内牛肉权力。此外,牛肉进口仍在进行,以满足国内牛肉需求。然而,已经安排了一些策略,包括扩大畜牧区项目。作为一项初步研究,本项目旨在从牛的增重和出生率两方面考察采矿区发展牛场的可能性。数据取自印度尼西亚东加里曼丹省PT Berau Coal,并使用描述性统计进行分析。结果表明:婆罗门杂交牛的出生率为65%;巴厘牛(42%);东加拉牛(94%)。在不同的养殖制度下,精耕细作(零放牧)和半精耕细作(放牧)的婆罗门杂交牛平均增重最高,分别为0.43 kg/d和0.22 kg/d。为了使ICF在矿山关闭时成为社区生计,由于体重增加的改善,需要采用一些策略。对于商业用途的肉牛,选择雄性牛比选择雌性牛更好。然而,这个项目提高了社区从培训计划中获得的能力和独立性。此外,ICF可以被认可为煤矿关闭后自然资源管理的可持续性。
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引用次数: 1
Optimisation of gold recovery from small scale custom mills 从小型定制工厂的黄金回收优化
W. Nheta, M. Nkwinika, M. Mailula
Custom mill tailings generated during the treatment of gold ores in Custom milling plants contains a considerable significant amount of gold (Au) and Silver (Ag). The potential of recovering gold and silver from the tailings by cyanidation leaching process was investigated. The custom mill tailings were characterised using Malvern particle analyser, XRF, XRD and SEM-EDs. In this study, the MiniTab software experimental design method was used to determine the optimum leaching conditions. The PSD results revealed that the custom mill tailings are coarse with 80% passing 2000μm. The tailings are a quartzite material containing minor amount of sulphides such as pyrite, chalcopyrite and pentlandite. The amount of these sulphides is very low ruling the probability of the tailings being refractory. Recoveries of 88 and 95% for gold and silver respectively were achieved leaching at 800g/t NaCN 8hrs. However, gold recovery above 85% was achieved by leaching in 600g/t NaCN for 8 hrs. Custom mill tailings have proved to be a source of precious metals and Min Tab software is a useful tool in optimisation of the leaching conditions.
在定制磨矿厂处理金矿时产生的定制磨尾矿中含有相当数量的金(Au)和银(Ag)。探讨了采用氰化浸出工艺从尾矿中回收金银的潜力。采用马尔文颗粒分析仪、XRF、XRD和SEM-EDs对定制尾矿进行了表征。本研究采用MiniTab软件实验设计方法确定最佳浸出条件。PSD结果表明,定制磨尾矿粒度较粗,超过2000μm的尾矿占80%;尾矿为石英岩类物质,含少量黄铁矿、黄铜矿、镍黄铁矿等硫化物。这些硫化物的含量很低,决定了尾矿耐火的可能性。在800g/t NaCN条件下,浸出时间为8h,金和银的回收率分别为88%和95%。在600g/t NaCN浸出8小时后,金回收率达到85%以上。定制的尾矿已被证明是贵金属的来源,而Min Tab软件是优化浸出条件的有用工具。
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引用次数: 1
A Serious Game for Evaluating the Competencies of Environmental Consultants 一个评估环境顾问能力的严肃游戏
Mariem Bouri, L. Chraibi, N. Sefiani
Having a competent workforce is one of the key elements that enable organizations to improve their global performance Thus, it is important for an organization to manage the competencies of its staff in the best possible way. In this paper, we present a serious game named EnviRun’, that evaluates the acquired competencies of environmental consultants _ The environmental consultant advises and assists industries on projects related to the environment and sustainable development_ Indeed, Competency evaluation allows the organizations to define the potential of existing competencies and to specify competencies that need to be improved. To this end, the first step was competency identification. Indeed, we developed a competency framework that includes competencies required by an environmental consultant. Thereafter, the game elements were designed. To evaluate the environmental consultants’ competencies, an approach based on the interval-valued 2-tuple linguistic representation model has been proposed, this approach is more flexible when dealing with qualitative information.
拥有一支称职的员工队伍是使组织能够提高其全球绩效的关键因素之一,因此,对组织来说,以最好的方式管理其员工的能力是很重要的。在本文中,我们提出了一个名为EnviRun的严肃游戏,该游戏评估环境顾问获得的能力-环境顾问就与环境和可持续发展有关的项目向行业提供建议和协助-确实,能力评估使组织能够确定现有能力的潜力并指定需要改进的能力。为此,第一步是能力识别。事实上,我们开发了一个能力框架,其中包括环境顾问所需的能力。然后设计游戏元素。为了评估环境顾问的能力,提出了一种基于区间值二元语言表示模型的方法,该方法在处理定性信息时更加灵活。
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引用次数: 1
Exploring the Properties of User-defined Phase Change Materials for Thermal Energy Storage 探索自定义相变材料的储热性能
L. Sevilla, J. Radulovic
- In this paper, a 2D thermal energy storage (TES) is modelled and solved numerically in the software COMSOL Multiphysics. The aim of this study is to examine the suitability of relevant thermal properties for the selected system design for charging only. The system consists of a cylindrical tank with height 0.5m and diameter 0.5m, acting as a packed bed full of encapsulated phase changing materials (PCM). The heat transfer fluid is water, entering the system at 90°C at a velocity of 0.01m/s. The investigation of the relevant properties focuses on the effect of melting temperature, latent heat of fusion, density, thermal conductivity and specific heat capacity. The final temperatures at different for spheres at different positions across the tank length are recorded and the heat absorbed for said spheres is calculated. Results indicate that the liquid properties of the PCM are more dominant over the temperature reached by system than the solid ones. Furthermore, higher final temperatures have been noted for high thermal conductivity of the liquid. In contrast, high specific heat capacity of the liquid yields significantly lower final temperatures.
本文在COMSOL Multiphysics软件中对二维热储能系统(TES)进行了建模和数值求解。本研究的目的是检查所选系统设计的相关热性能的适用性,仅用于充电。该系统由一个高0.5m,直径0.5m的圆柱形储罐组成,作为一个充满封装相变材料(PCM)的填充床。传热流体为水,在90℃时以0.01m/s的速度进入系统。对相关性能的研究主要集中在熔融温度、熔合潜热、密度、导热系数和比热容的影响上。记录了不同位置的球体在不同槽长的最终温度,并计算了所述球体吸收的热量。结果表明,在体系达到的温度下,PCM的液体性质比固体性质更占优势。此外,由于液体的高导热性,已注意到较高的最终温度。相比之下,高比热容的液体产生明显较低的最终温度。
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引用次数: 0
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Proceedings of the 6th World Congress on Mechanical, Chemical, and Material Engineering
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