球阀处硫颗粒运移沉降规律数值模拟研究

元素硫在集输管道中沉积会引起堵塞和腐蚀问题,球阀处是集输管道中较易出现大量硫沉积的部位之一。为此,采用数值模拟的方法研究高含硫天然气中析出的硫颗粒在球阀处的运移沉降规律,选用雷诺应力模型模拟球阀处的流场,选用Lagrange颗粒轨道模型追踪硫颗粒在球阀处的运动轨迹,探讨影响硫颗粒在球阀处沉积的因素。结果表明:气流进入球阀内将会出现压力损失和流动分离,气流进口速度和球阀开度会对流场产生影响;硫颗粒在球阀处的沉积率随气流流速和颗粒直径的增大而增大,随球阀开度的增大而减小;重力和离心力是造成硫颗粒在球阀处出现大量沉积的重要原因。     

缓闭止回阀防护水锤的研究

笔者就水泵扬水的压力输水系统中设置气压式调压室和缓闭止回阀的问题 ,建立了实验模型和相应的数学模型 ,并进行了理论分析研究、数值模拟和实验研究 ;通过实验 ,验证了数值模拟的数学模型和计算程序 ,并且指出了缓闭止回阀使用的范围 ,纠正了使用缓闭止回阀的误区 ,对提高压力水系统安全性及降低工程成本具有现实意义。     

Conceptual design of pressure relief systems

Conceptual design of pressure relief systems is an important stage in the design of a safe process plant. The conceptual design stage consists of the following steps: deciding on the location of pressure relief devices, selecting the general type of pressure relief device for each identified location, i.e. safety valve and/or bursting disc (rupture disc), or other relief device, and selecting the special features for the chosen device type. Some regulations, codes and standards, and a decision tree for the selection of a relief device have been described in the literature. This paper presents four decision trees that have been developed for the different steps in the conceptual design stage. Only positive pressure in pressure vessels is considered here.     

一起先导式安全阀未超压起跳故障分析

通过对一起先导式安全阀起跳的原因进行分析,认为该安全阀起跳的主要原因是工艺操作未控制好及未按规范要求落实定期校验制度,并就先导式安全阀的使用、维修、校验等环节提出应对措施。     

堆芯中子注量率测量系统核级阀门的型式试验

堆芯中子注量率测量系统是30万千瓦核电厂监测系统的重要组成部分。该系统中的手动阀、止回阀和电动阀(阀体)属于核级阀门。介绍了堆芯中子注量率测量系统的组成和功能,并根据ASMEQME-1—2002规范从试验项目、环境条件和考核指标等方面对手动阀、止回阀和电动阀提出了型式试验技术要求。制造厂根据型式试验技术要求制定了手动阀、止回阀和电动阀试验大纲,并对样机进行了型式试验和检验,试验结果满足试验大纲要求。     

HG220/100型锅炉工作安全阀热态校验的安全可靠性分析

指出了HG220/100型锅炉热态校验工作安全阀时各级过热器及联箱的超压所导致的安全问题,对超压原因进行了分析,并提出了改进措施。     

基于数字减影技术的阀门动态监测系统

阀门的操作不当,可以导致安全事故的发生.通过数字减影技术,并考虑了背景模型对背景变化的响应速度和背景模型对运动目标要有较强的抗干扰能力等因素,研究开发出基于数字减影技术的阀门动态监控系统,对设备的安全运行起到一定的保障作用.     

一种新型防结冰阻火一体化呼吸阀的应用

针对北方寒冷地区石油储罐呼吸阀和阻火器,特别容易发生结冰阻塞不能正常呼吸而使得储罐冬季安全运行存在重大隐患,介绍了一种新型防结冰阻火一体化呼吸阀,并与普通呼吸阀对比分析了两种呼吸阀的优缺点,证明该种新型呼吸阀从设备本质上解决了普通呼吸阀的冬季结冰堵塞等安全隐患,具有推广价值。     

Torque Production Using Handwheels of Different Size During a Simulated Valve Operation Task

Opening and closing valves in industrial facilities often requires operators to use bars and wrenches as levers (cheaters) in order to overcome initial actuation forces. In order to determine more appropriate operational specifications, the maximum torque production capability was measured when 12 male participants used 4 different valve handwheels at 3 different heights and 2 different angles (in relationship to the coronal plane). The results indicate that the participants produced significantly greater torque when the largest of the 4 wheels (40.6 cm diameter) was used than when the medium (22.9 cm), small (20.3 cm), and handled (17.8 cm) handwheels were used. Although the main effect of heights was found to be statistically significant, post-hoc analyses between the heights found them to be, essentially, equal. In addition, the vertical and horizontal wheel orientations were not found to be different. The results are applicable to all industries where handwheels are used and applicable to valve manufacturers for designing operational torque specifications below the values found in this study.     

流动注射分析仪运行条件的影响因素与调试经验

通过实践,介绍了在流动注射分析仪上如何设置分析方法的运行参数,以及如何确定到阀时间的经验。