Westfalia OSD新型分油机UNITROL系统的详细分析

详细介绍Westfalia公司的OSD新型分油机的UNITROL系统,着重分析UNITROL 系统的工作过程及控制信号,并适时与阿法拉伐分油机进行比较,最后分析了UNITROL系统常见故障,并提出了解决方案.由此得出结论,配备UNITROL系统的Westfalia OSD新型分油机具有更高的自动化程度以及分离效率.     

某船S型分油机排渣口跑油故障实例

正0引言某远洋船舶主机型号为MAN BW 8L460C,额定功率8 400 k W,缸径460 mm,行程560 mm,额定转速500 r/min,配备2台阿法拉伐S型滑油分油机。船舶在前次航行过程中出现分油机排渣口跑油故障,值班人员赶到机旁还未来得及消除警报,分油机已经自动停机。排渣口跑油导致分油机不能正常工作,无法对滑油进行分离清洁,含有水分和杂质的滑油会使其润滑及冷却效果变差。分油机长时间停     

GEA-OSE10型分油机产生异常噪音和振动原因分析

船用柴油机所用的燃料油在进入柴油机前需要进行一系列的处理,加热、净化等,以去除其中的水分和杂质,净化得好与不好取决于分油机的性能优劣,但在分离过程中会出现许多的故障,分离筒达不到规定转速,排渣口跑油,出水口跑油等,此文主要研究分油机产生异常噪音、振动的原因和处理办法,通过对此系统的研究,可以更准确的判断噪音、振动出现的地点与原因,以便正确而及时地做出应对措施消除故障,使分油机发挥其工效,保护柴油机以及延长其使用年限。     

主机滑油分油机跑油故障分析

文章通过船舶2#主机滑油分油机排渣后跑油的问题,介绍了应对方法,包括分油机解体更换密封圈、立轴横轴解体更换轴承、离合器摩擦片更换与开槽、整体分离筒换新等。     

浅析分油机跑油故障及处理

本文从保证船舶正常航行安全的角度出发,分析了分油机跑油的原因,介绍了分油机跑油的故障现象及排除措施,提出了防止分油机跑油的管理要点,并以轮机实训室内配置的分油机为例,对带引学生实操实训过程中出现分油机出水口跑油情况进行了分析讨论。     

Westfalia OSD6型分油机的管理与维护

文中通过以下几个方面来阐述Westfalia OSD6型分油机的管理与维护要点：分油机的技术及结构特点;分油机的启动、操作、运行中日常管理及检查要点;OSD6分油机的拆检及维护保养与注意事项;分油机故障的判断与分析;燃油、滑油在分油机运行过程中异常流失的途径与控制;在管理中容易疏忽的几个问题等等。     

船舶燃油净化系统建模与仿真

首先建立燃油系统管网、泵阀件、油柜、蒸汽加热器、水箱、分油机分离过程以及分油机电机电流和转速的动态数学模型;然后用C#高级语言编程实现燃油净化系统仿真逻辑控制界面,并使用实物PLC控制器对仿真分油机进行自动控制,二者以通讯方式实现互连.燃油净化仿真系统的运行结果表明,半实物仿真的设计方案准确,模型精度满足仿真要求.     

滑油分油机排水口缘何跑油?

某轮电喷系统对主机滑油的干净程度要求极高,所以配备了两台滑油分油机对主机滑油进行净化.某日,运行NO.2滑油分油机时,出现了排水口跑油的故障.该滑油分油机的油水分界面由比重环控制,水封水、排渣水、密封/补偿水分别由电磁阀SV10、SV15、SV16控制,排水口与排渣孔均在分离桶内.     

某轮分油机跑油故障分析及处理

文章从保证船舶正常航行安全的角度出发，分析了分油机跑油的原因，介绍了分油机跑油的故障现象及排除措施，提出了防止分油机跑油的管理要点，并以某轮出水口跑油故障为例进行了分析讨论。     

MOPX 207型滑油分油机故障实例

正0引言滑油在现代船舶柴油机运行中的作用和重要性不言而喻,为确保滑油品质,必须对其进行及时、有效的处理。滑油经滑油分油机处理后,所含有的固体杂质和水分大部分被分离排出。因此,对滑油分油机进行日常的保养和维护是确保滑油质量的重要保证。1故障现象某船MOPX 207型自动排渣滑油分油机在一段时期内经常出现高温和低温报警,主管轮机员认为是分离片脏污所致。清洗滑油分油机的分离片,重     

Three-dimensional numerical investigation of the separation process in a vortex tube at different operating conditions

Air separators provide safe, clean, and appropriate air flow to engines and are widely used in vehicles with large engines such as ships and submarines. In this operational study, the separation process inside a Ranque–Hilsch vortex tube cleaning (cooling) system is investigated to analyze the impact of the operating gas type on the vortex tube performance; the operating gases used are air, nitrogen, oxygen, carbon dioxide and nitrogen dioxide. The computational fluid dynamic model used is equipped with a three-dimensional structure, and the steady-state condition is applied during computations. The standard k–ε turbulence model is employed to resolve nonlinear flow equations, and various key parameters, such as hot and cold exhaust thermal drops, and power separation rates, are described numerically. The results show that nitrogen dioxide creates the greatest separation power out of all gases tested, and the numerical results are validated by good agreement with available experimental data. In addition, a comparison is made between the use of two different boundary conditions, the pressure-far-field and the pressure-outlet, when analyzing complex turbulent flows inside the air separators. Results present a comprehensive and practical solution for use in future numerical studies.     

水力旋流器油-水分离性能数值模拟

本文对两种不同入口型式的水力旋流器的流场进行了数值模拟,湍流模型采用雷诺应力模型,并结合油-水两相流MIXTURE混合模型进行分析,得出：单入口旋流器流场切向速度、轴向速度呈偏心分布,而切向双入口型式的旋流器流场分布对称性明显优于单入口型式;切向双入口旋流器在油-水两相分离时,油相浓度沿着径向方向变化率更大,且更易于向中心区汇聚,利于分离,分离效率要高于单入口旋流器;实验结果证明了模拟结果的正确性。     

CWA 15375试验方法先进性分析

近年来,船用主机厂家、船舶制造厂商和船级社都需要一个数据指标来判断分离机对船用残余燃料油中催化粒子和其他污染物的去除能力,CWA15375就是针对这一需求制定的一种可重复试验方法。该方法使用特殊的测试油和测试粒子来测定分离机的分离性能。文章对试验性能方法进行了简要概述,并分析CWA15375试验方法的先进性和其在分离机领域的重要意义。     

AUV均衡系统设计及垂直面运动控制研究

针对AUV传统均衡调节系统存在难以克服的缺陷而无法实用的问题,设计了一种新型液压均衡系统。该系统主要由油箱和安装在AUV轴线上的两个油囊组成,通过调节油箱和油囊的油量来调节AUV的姿态和浮态。同时在简化AUV垂直面运动模型的基础上,构建了深度控制、纵倾控制和浮态控制模型,并基于PID和均衡系统设计了深度控制、纵倾控制和浮态控制方法。仿真结果表明在无干扰和有干扰两种情况下,设计的均衡系统能有效控制AUV的垂直面运动;建立的AUV垂直面运动控制模型符合AUV运行特性;PID控制算法适合海流干扰下的AUV均衡控制,且具有良好的控制品质。     

汽轮机鼓形齿联轴器润滑油流动特性研究

鼓形齿联轴器是船舶汽轮机组轴系连接中的重要部套件,鼓形齿啮合时产生较大热量,实际运行时需通入润滑油对齿间区域进行冷却以保障鼓形齿不被烧至胶合。本文针对某汽轮机鼓形齿联轴器,对机组联轴器喷油管出口至联轴器油冷通道出口区域的流动特性进行了详细分析,研究了其润滑油冷却齿面的物理原理;并对两种不同油冷流道结构在不同喷油管进口流量下的齿面对流传热特性进行了研究,发现提高联轴器喷油管的进口流量对联轴器齿间冷却效果提升均较为显著,且改进设计的油冷流道中鼓形齿面平均对流传热系数高于原始流道约25%,冷却效果提升显著。     

Oil pollution violations on vessels and adequacy of maritime training

The paper projects the outcomes of an introspective study into the training imparted to the seafarer with respect to oil pollution matters. Typical training syllabi were compared with the prescribed lesson plans from Model Courses to verify quantitative and qualitative training. A sample has been drawn from the Malaysian and Indian seafaring officers for the study. Curriculum exposure to marine pollution regulations, and intensity and level of ship operational issues such as bypassing the separators and falsification of record books are analysed in the study. From the questionnaire survey amongst the officers, difficulties experienced in pollution prevention practices are highlighted. Statistical data analyses have been carried out to see if there is any relationship between pollution violations, training and human factors such as experience and attitude. While training appears to be sufficient, fatigue and attitude appear to be the causal factors for oil pollution violations. The paper concludes with suggestions for improving training such as simulator exercises and case study discussions, etc.     

Supply and demand of new oil tankers

This paper examines the world-wide supply and demand for new oil tankers. A simultaneous supply and demand model is developed and estimated using two-stage least squares techniques and empirical data from 1972 to 1983. The relationships between tanker newbuilding orders and prices, and other relevant market factors are analysed. Major factors affecting the tanker new building market are identified. The results indicate that: oil price and second-hand tanker price are predominant factors influencing future newbuilding demand; a moderate decrease in laid-up tonnage would not induce a significant increase in newbuilding orders; shipbuilding capacity is a more influential factor for the short-run supply of new tankers than shipbuilding cost. Technological change has also played an important role in the market.     

新型水下RTP管楔块夹紧式接头设计与分析研究

针对适用于水下的6英寸非金属粘结性RTP管,设计了新型的楔块夹紧式接头。使用SolidWorks软件进行了结构设计,并基于有限元理论建立了有限元分析模型,采用ABAQUS有限元分析软件对楔块夹紧式接头系统在极限工作内压和轴向拉伸条件下进行静态分析。得到了该新型楔块夹紧式接头系统在极限工作内压条件下的Von Mises应力、接触应力和剪切应力,并按照DNV设计规范对接头所受应力进行校核,验证了新型楔块夹紧式接头系统的设计可行性与结构可靠性,同时探究了该楔块夹紧式接头在设计制造以及安装时遇到的一些问题,给出了相关的设计、加工、安装和使用方面的建议,为国内水下油气管线的发展和使用提供帮助。     

基于虚拟仪器技术的燃油喷射测试系统的研制

介绍柴油机燃油喷射测试系统的软、硬件组成及功能,采用该系统对6L16／24柴油机燃油喷射系统的特性进行了测量分析,对比分析不同工况下燃油喷射系统的性能,表明燃油喷射测试系统满足测量精度的技术要求。     

Modeling emulsification after an oil spill in the sea

A conceptual model for simulating oil emulsification after a spill in the ocean is presented. This paper contains the complete model formulation and scenario simulations. The model formulation is based on the most up-to-date research information available in the literature. The model uses minimum turbulence energy as a criterion to determine whether emulsification occurs. Once the emulsification happens, the model simulates water uptake and viscosity changes during emulsification. The model classifies emulsion into three categories: stable, meso-stable, and unstable emulsions based on a concept “stability index”. The model estimates the stability of the emulsion and simulates the process of de-emulsification when the emulsion is meso-stable or unstable. The model also considers the effects of evaporation on the formation of emulsification. Scenario simulations show how different types of emulsions are formed under different conditions. They also show how the emulsion stability changes with oil weathering.