承压汽运罐车安全充装控制系统设计与应用

针对前郭石化公司承压汽运罐车安全充装要求,设计了基于PLC的油品安全充装自动控制系统,解决了传统油品充装过程中存在的安全隐患,提高了油品充装效率,在实际生产中取得了良好的使用效果。     

气体充装的安全措施建议

气体充装属于危险化学品的生产过程,目前我国的充装行业以小、散、乱的形式存在,生产单位普遍有安全意识薄弱,安全措施不到位,建设不规范等现象。本文旨在对气体充装的生产过程中,从各个方面进行安全措施的建议,为企业的安全生产提供一些帮助。     

二氟一氯甲烷钢瓶充装控制系统设计及应用

介绍一种新的二氟一氯甲烷钢瓶充装控制模式,采用PLC、称重仪表、人机接口、现场总线、数据库等技术,实现了二氟一氯甲烷钢瓶定值充装的自动控制,有效地提高了物料充装精度、工作效率和安全生产系数,降低了操作人员的劳动强度,提升了钢瓶数据信息管理水平,极大地提高了二氟一氯甲烷钢瓶充装过程的自动化及信息化水平。     

日越合资建工业气体生产企业

日本工业气体生产厂家Nippom Sanso(日本酸素公司)与越南最大的工业气体生产厂家Sovigaz建立了一家1860万美元的合资企业,生产和销售工业气体。这一60/40的合资企业     

液体四氧化二氮的制备和充装技术

为满足用户对液体四氧化二氮的需求,四川泸天化股份公司浓硝车间根据用户实际需求量和需求纯度,对现运行的5.7万t/a的浓硝酸合成装置进行液体四氧化二氮中间产品充装设计,并对在生产浓硝酸过程中液体四氧化二氮的充装进行了探索,最终解决了液体四氧化二氮充装过程中的浓硝酸生产平衡问题。     

改造液氯充装秤 提高充装安全性

液氯充装是氯碱生产的一个重要环节。也是一个存在安全隐患的环节。超量充装不但损害企业的经济利益，给企业造成损失，更重要的是超量充装容易诱发事故，造成巨大的社会危害和环境污染。为了保证液氯充装的安全性，鲁西化工集团聊城蓝威化工有限公司(简称鲁西化工集团公司)对液氯充装设置了自动切断报警装置。     

液氯液下泵的应用

介绍了液氯液下泵在液氯生产中的应用情况及优缺点 ,液氯液下泵的使用可大大方便液氯槽车的充装 ,比汽化液氯升压充装提高工效 3～ 5倍     

年产8万吨有机气体提纯及充装改造项目

<正>该项目位于河南省濮阳市范县产业集聚区濮王产业园,由濮阳市华勋工业气体有限公司投资建设,年产8万吨有机气体提纯及充装改造项目(建设5万t/a液化气分离及提纯装置、3万t/a烯烃分离装置)。工艺技术:以液化石油气为原料,液化石油气-加热-催化-精馏分离-冷凝-回流-分馏-储存罐。主要设备:提纯装置、反应塔、加热炉、容器、机泵、冷换     

氯气液化装置安全设计措施

介绍了对液氯生产、储存、充装等装置的安全技术改造内容。     

几种工业气体的开发及应用

介绍了高纯氢、硫化氢、硅烷等几种工业气体的生产、应用情况及开发前景     

高浓度CO变换催化剂装填量的动力学计算及问题探讨

应用动力学模型,结合工业生产数据,讨论了高浓度CO气体组成中一段催化剂的装填精度问题。分析了活性系数对催化剂装填量的影响,以年产15万t甲醇的德国GSP粉煤气化工艺为例进行了动力学模拟计算。结果表明:经过工业数据校正的动力学方程可以满足催化剂装填量计算的精度;采用分段进气或废锅副产蒸汽、分段变换制取甲醇等方法,可使反应深度和床层热点温度控制在要求范围以内。     

压缩天然气加气母站工艺设计方案

随着经济的飞速发展,空气质量存在着严重的问题,而清洁能源天然气是当前最合适的汽车替代燃料。应用分输站或城镇管网预留接口的天然气,经调压、计量、脱水干燥后进入压缩机,经压缩机增压至20 MPa后直接为高压气体半挂车充气,为CNG加气子站提供天然气气源,在一定程度上缓解了环境污染问题。阐述了压缩天然气加气母站的主工艺流程、安全泄压保护流程、加臭流程,压缩机、脱水装置等主要设备的选型以及自控仪表等方面的工艺设计方案。     

低变钴钼系新旧催化剂两段混装工艺优化方案

简述了优化钴钼系新旧催化剂混装工艺的必要性;从测温点配置、硫化副线设置、分离器设置等方面优化了新旧催化剂混装时的升温硫化流程;从温度控制、二硫化碳氢含量控制、循环煤气中氢含量控制等方面阐述了两段混装催化剂硫化过程的控制要点;针对不同的低变工艺流程以及操作温度、运行汽气比、预防催化剂失活等因素,提出了中低低变换工艺时两段新旧催化剂的混装方式。     

工业废气中丙酮处理工艺研究进展

工业废气中丙酮回收的问题,是当前工业废气处理的难点、热点问题。本文详细介绍了吸附法、吸收法、冷凝法、燃烧法和膜分离法等常用的工业废气中丙酮的处理工艺,分析现有的丙酮处理工艺在工程实施方面存在的问题,对各个方法进行比较。并对以后的研究方向进行了展望,指出多种方法集成技术是工业废气中丙酮处理工艺的工业化新方向。     

The occurrence of surface roughness in gas assist injection molded nylon composites

Gas assist injection molding has increasingly become an important industrial process because of its tremendous flexibility in the design and manufacture of plastic parts. However, there are some unsolved problems that limit the overall success of this technique. The purpose of this report was to study the surface roughness phenomenon occurring in gas assist injection molded thermoplastic composities. The materials used were 15 % and 35% glass‐fiber filled nylon‐6 composites. Experiments were carried out on an 80‐ton injection molding machine equipped with a high‐pressure nitrogen‐gas injection unit. Two “float‐shape” axisymmetric cavities were used. After molding, the surface quality of molded parts was measured by a roughness meter. Various processing variables were studied in terms of their influence on formation of surface roughness: melt temperature, mold temperature, melt filling speed, short‐shot size, gas pressure, and gas injection delay time. Scanning electronic microscopy was also employed to characterize the composites. It was found that the surface roughness results mainly from the exposure of glass fiber in the matrix. The jetting and irregular flows of the polymer melt during the filling process might be factors causing the fiber exposure.     

膜技术在油气回收中的应用

文章首先介绍了油气分离膜的工作原理和分离过程特点,重点阐述了膜技术在油库、加油站和炼油厂等工业领域油气回收中的应用,同时介绍膜技术发展过程中注意的问题。     

Packaging of yield stress fluids: Flow patterns

The packaging or filling of a container with a non‐Newtonian fluid without quality failures is a current issue encountered at the final step of industrial product processes. In this work, the container filling of viscoplastic fluids is studied using an experimental laboratory plant able to reproduce the industrial transitory packaging conditions. First, a Newtonian validation was conducted to compare and to confirm our setup results with available literature data. Second five flow patterns including dripping, jet buckling, mounding, planar filling, and air entrainment were observed and characterized for the viscoplastic container filling. Most of them present different types of instabilities during the filling, except the planar filling, which seems to be ideal according to industrial specifications. A flow pattern distribution depending on relevant dimensionless numbers was developed. Finally, flow pattern transition criteria are determined highlighting the influence of rheological and process parameters on container filling. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1117–1126, 2018     

Experimental and DEM study of segregation of ternary size particles in a blast furnace top bunker model

Size segregation of pellets in the top bunker (hopper) of a blast furnace is an important factor affecting the radial distribution of the charged burden and indirectly also the distribution of gas in the shaft and cohesive zone. This paper studies size segregation of ternary size pellets during the discharging process of a hopper model through experiments and simulations. The simulations, which are based on the discrete element method (DEM), are first validated using four experimental cases applying different bunker filling methods. The effects of various variables, such as fine mass fraction, particle friction coefficients, diameter ratio of fine to coarse and filling method (random, layered or industrial filling), as well as the interaction with wall (static and rolling friction) on the segregation are investigated. The results show that even though many factors affect the extent of segregation during the discharging process, the most important factors are the filling method, diameter ratio of fine to coarse, wall-particle static and rolling friction, interparticle rolling friction as well as mass fraction of fine particles. Reducing wall-particle rolling or static friction or the fraction of fine particles decreased the extent of size segregation.     

电石法VCM原料气水含量对YG铜基催化剂性能的影响

详细论述了电石法PVC生产工艺乙烘和氯化氢混合原料气中水含量对YG铜基催化剂性能的影响,阐述了现有的电石法PVC脱水工艺对YG铜基催化剂工业化应用的适应性。     

尿素脱氢催化剂的再生与应用

为了消除尿素高压合成尾气中混合气体的爆炸隐患,在原料气进入合成系统前设置了脱氢系统。介绍了脱氢系统的工艺流程;简述了TH-3型脱氢催化剂的基本特性、填装及使用情况;总结了TH-3型脱氢催化剂的再生与应用的相关经验。结果表明,再生后的脱氢催化剂仍可重复使用,在一定程度上降低了尿素的生产成本。