深水J形首端PLET 安装分析

基于南海陵水17-2深水油气田开发,针对J形首端海底管道终端（Pipeline End Termination,PLET）安装,采用OrcaFlex软件开展数值模拟,研究波流载荷对安装系统的影响,以得到其作业窗口,并分析J形首端PLET安装过程中作业窗口的影响因素。结果表明,PLET在飞溅区和预着陆阶段比较危险,波浪周期约10 s波流同向横浪是安装作业的控制工况。研究内容为南海陵水17-2海底管道J形首端PLET安装提供了重要的技术支持。     

矿物掺合料对磷酸镁水泥性能影响及机理研究现状

磷酸镁水泥(MPC),具有快硬、早强等优点,应用于道路抢修、重金属固化等领域,但其存在凝结时间过快、耐久性差等缺陷.通过矿物掺合料对MPC进行改性,延缓其凝结时间、改善其耐久性的同时,实现了工业废渣的循环再利用.本工作综述了粉煤灰、矿渣、偏高岭土、硅灰等矿物掺合料对MPC流动度、凝结时间、力学性能、耐久性的影响,并对矿...     

Plantwide operability assessment for nonlinear processes using a microscopic level network analysis

The increase of raw material and energy costs has caused a shift in process design philosophy leading to more complex chemical plants utilising heat integration and material recycles. This warrants plantwide dynamic operability analysis in the process design stage. In our previous work, a networked plantwide operability analysis approach was developed, where the plantwide process is viewed as a network of process units connected via mass and energy flow. Such an analysis is based on the dissipativity of each process unit and the topology of the process network. However, to determine the dissipativity of multivariable nonlinear process units is often extremely difficult. In this work, we take the network approach to a microscopic level and treat each nonlinear multivariable process unit as a network of individual (single state) mass and energy balances (sub-systems). The plantwide process is then viewed as a network of such sub-systems rather than physical process units. The dissipativity of these simple sub-systems can often be determined more easily in comparison to that of multivariable sub-systems. The dissipativity property (in terms of supply rate) of the entire nonlinear process can be parametrised by the dissipativity of individual sub-systems, leading to a cluster of supply rates. The operability of the plantwide nonlinear process can then be determined based on the above parametrised dissipativity which can be much less conservative than existing nonlinear analysis. The effects of interactions caused by the interconnections are considered explicitly based on the network topology. The stability and stabilisability analysis problem is then converted into a feasibility problem with linear matrix inequalities which can be solved numerically. The application of the proposed approach requires successful determination of the dissipativity of nonlinear sub-systems.     

磺化工艺的危险性及可操作性分析

磺化工艺作为国家安全监管总局所列的首批重点监管的危险化工工艺,已经受到政府部门、企业以及设计单位的高度重视。通过对磺化工艺的介绍,阐述如何通过辨识危险因素,确定重大危险源,从而采取相关的应急停车系统,并通过引用HAZOP分析技术来进行危险工艺的安全设计,进而采取合理的事故防范措施。     

HAZOP分析在高性能纤维项目设计中的应用

介绍了碳纤维、芳香族聚酰胺纤维、超高分子量聚乙烯纤维等高性能纤维的主要生产工艺;概述了高性能纤维的安全生产特点;简述了危险源及可操作性(HAZOP)分析方法;使用HAZOP分析方法分析了对位芳纶项目设计中的硫酸储存混合流程;指出HAZOP分析方法对高性能纤维项目设计进行检查检验、减少设计错误、提高设计准确度和装置运行的稳定性有重大意义。     

手工焊环工序质量的分析研究

分析了手工制造焊环的工艺流程，根据实测的手工焊环加工工序前后的相关质量特性数据，利用质量分析工具直方图以及工序能力指数分析确定出影响手工焊环质量水平与均匀程度的主要工序并计算出相关工序的工序能力指数，从而得出影响手工焊环质量水平的主要因素，并对手工焊环制造过程中存在的薄弱环节提出了一些有益的改进建议．     

后3G时代LTE异军突起

介绍了下一代无线网络LTE(Long Term Evolution,长期演进)的背景和发展状况.分析了LTE的技术特征,阐述了LTE网络结构与核心技术,并通过与WiFi(WirelessFidelity)及WiMAX(World wide Inter operability for Microwave Access)的各项性能作比较,着重分析了LTE的技术优势.最后,指出了LTE在个人通信市场所面临的应用前景与挑战.     

Modern Technology Applied in Advanced BWR (ABWR)

The Advanced Boiling Water Reactor (ABWR) has been developed by an international team of BWR manufacturers to respond to worldwide utility needs in the 1990's. Major objectives of the ABWR program are design simplification; improved safety and reliability; reduced construction, fuel and operating costs; improved maneuverability; and reduced radiation exposure and radwaste. The ABWR is the result of the continuing evolution of the BWR, incorporating state-of-the-art technology and improvements based on worldwide experience, and extensive design and test and development programs. The ABWR incorporates the best proven features from BWR designs in Japan, the United States and Europe. The many new features are seen to provide superiority in terms of performance characteristics and economics relative to current LWR designs. The Tokyo Electric Power Co., Inc. recently announced the selection of General Electric Co., Hitachi, Ltd. and Toshiba Corp. to design and construct two lead Advanced Boiling Water Reactors as Unit 6 and 7 at the Kashiwazaki Kariwa Nuclear Power Station. Construction is scheduled for the early 1990's, and commercial operation planned for 1996 for Unit 6 and 1998 for Unit 7.     

Quality assessment support system and its use in pharmaceutical plant operations

On the basis of the quality by design approach, aggregation of knowledge in process chemistry and manufacturing operations is essential for the continuous development of pharmaceutical products and processes. We develop a model-based framework to describe process chemistry oriented phenomenal sequences leading to quality hazards (process deviation scenario), which should be independent of any specific plant structural information, and manufacturing procedural error oriented event propagations (procedural control scenario), which concern a specific plant structure. We propose a system, Quality-HAZOP, to analyze the scenarios in which manufacturing errors can affect product quality via complex propagation pathways. This system supports bidirectional improvement proposal between recipe scientists and process engineers. This proposal triggers risk information exchange that supports the continuous improvement of the process in life-cycle pharmaceutical development.     

化工园区及其生产装置等设施的安全问题探讨

化工园区很多化工生产装置、罐区等集聚在一起,安全问题十分重要,必须有防护措施。介绍了国内外安全评价发展及事故概况。国外强调提高本质安全水平和对人员进行安全文化教育,以防止事故发生和减少损失。现国外已普遍采用危险和可操作性研究(HAZOP)方法进行分析研究并认为其行之有效。最后对安全问题提出几点意见供参考。