聚丙烯装置挤压造粒机运行故障分析及处理措施

本文针对某石化工厂聚丙烯装置挤压造粒机在运行中出现过的故障原因进行了分析,制定相应的解决措施,并从中总结出规范性的操作,优化了造粒机的操作,减少了停车事件的发生,保障了装置的长周期运行。     

尖嘴式造粒机通过鉴定

由蓝星北京化工机械厂和济南炼油厂研制的ＢＣＭ尖嘴式造粒机于1999年12月22日在济南通过了由中石化重大装备国产化办公室组织的技术鉴定。该尖嘴式造粒机技术先进、结构合理。其尖嘴式滴嘴结构设计可大大减少物流与滴嘴的附着力,从而克服了国外产品物料附着、甚至堵塞滴?..     

从液态到固态：新型Rotoform HS造粒机在Econova公司进行的测试圆满结束

山特维克过程系统有限公司的工程师们可以放心了，新型的Rotoform HS型造粒机的试验阶段已经圆满结束。这种新型造粒设备的特点是带有双造粒管。记者有幸在西西里的Econova公司中观看了在实际生产条件下Rotoform HS型造粒机的“新特点”。[编者按]     

四螺杆造粒机螺杆端密封改造

本文结合大庆炼化公司聚合物二厂聚合车间四螺杆造粒机的使用情况,对螺杆密封端进行不断改造从而保证密封效果,提高螺杆使用周期。     

专利信息

无烟型再生塑料造粒机CN2712592Y；包装容器1316370；包装材料和采用该包装材料的包装容器1564774。[编者按]     

高端造粒机依赖进口 塑机业亟待技术突破

大连橡胶塑料机械股份有限公司宣布,该公司研制的国产大型塑料造粒机将于今年5月份在其新厂区投产试车。据了解,国产高端塑机在国内市场还是凤毛麟角,进口产品仍占绝对市场份额。     

钢带式造粒机在顺酐行业的应用

我国顺酐产品的成型机械目前均采用接片机成型,其成型率低于60%,既影响后续包装称的精度和工作环境,又影响产品存放周期,降低了该产品的巿场竞争力和出口竞争力.针对顺酐产品成型存在的问题,通过rfj场调查大胆使用钢带式造粒机以提高产品的成型率,增加产品的竞争力.通过选用山特维克中传动系统公司生产的ROTOFORMER3000MA造粒机在现场的实际使用情况,其成型率达到90%以上,增扩大了产品的巿场需求,满足了不同客户的要求.     

聚丙烯造粒机螺杆磨损浅析

本文主要结合聚丙烯造粒机磨损经过及处理过程,分析磨损的可能原因,并提出避免磨损加剧的方案,直至最终解决方案。并在操作上、设计上蓰出相应的应对措施,以确保该机组能够长周期稳定运行。     

工程建设信息

1.北京东方有机化工厂搬迁项目项目性质:改扩建建设周期:2008-2010年投资总额:154100万元审报方式:核准制进展阶段:开工在建关键设备:反应器、压缩机、裂解炉、干燥器、造粒机、挤出机。建设内容:装置搬迁与扩建     

挤压造粒机粉料秤工作曲线的回归及其应用

化二车间七万吨／年聚丙烯装置的挤压造粒系统采用的是德国WP公司技术。针对运行中粉料秤出现故障造成挤压造粒机系统停车的问题，通过采集运行数据利用回归分析的方法找出生产负荷与下料旋转阀变频器控制频率之间的对应函数关系，以便用于生产实践。     

A model/solution-adaptive explicit-implicit time-marching technique for wave propagation analysis

In this work, an explicit-implicit time-marching procedure with model/ solution-adaptive time integration parameters is proposed for the analysis of hyperbolic models. The two time integrators of the methodology are locally evaluated, enabling their different spatial and temporal distributions. The first parameter defines the explicit/implicit subdomains of the model, and it is defined in a way that stability is always ensured, as well as period elongation errors are reduced; the second parameter controls the dissipative properties of the methodology, allowing spurious high-frequency modes to be properly eliminated, rendering reduced amplitude decay errors. In addition, the proposed explicit-implicit approach allows contracted systems of equations to be obtained, reducing the computational effort of the analysis. The main features of the novel methodology can be summarized as follows: (i) it is simple; (ii) it is locally defined; (iii) it has guaranteed stability; (iv) it is an efficient noniterative single-step procedure; (v) it provides enhanced accuracy; (vi) it enables advanced controllable algorithmic dissipation in the higher modes; (vii) it considers a link between the temporal and the spatial discretization; (viii) it stands as a single-solve framework based on reduced systems of equations; (ix) it is truly self-starting; and (x) it is entirely automatic.     

A simple and effective single‐step time marching technique based on adaptive time integrators

In this work, a novel time marching procedure is presented in which adaptive time integration parameters are locally computed, allowing different spatial and temporal distributions. As a consequence, a more versatile technique arises, enabling an enhanced performance. The main features of the proposed technique are: (1) it is simple; (2) it has guaranteed stability; (3) it is an efficient non‐iterative adaptive single‐step procedure; (4) it provides enhanced accuracy; (5) it enables advanced controllable algorithmic dissipation in the higher modes; (6) it is truly self‐starting; and (7) it is entirely automatic, requiring no input parameter from the user. The proposed technique is very complete, providing the main positive attributes that are requested from an effective time marching procedure. Numerical results are presented along the paper, illustrating the excellent performance of the method. Copyright © 2016 John Wiley & Sons, Ltd.     

对空调器内压缩机脏堵问题的分析研究

空调器的售后服务中,最怕出现压缩机不工作的情况。因为这常常意味着除了是最简单的线路不通就是压缩机内部出现抱轴卡缸现象,而处理这种问题的方法就是彻底换压缩机,成本较昂贵。既增加了厂家的负担,也引起用户的不满。我认为,只有找出问题出现的原因,并解决在生产过程中,才可避免这种情况。希望对空调器厂家和压缩机厂家的质量控制提供帮助。     

一种新的隔震换能控制装置及其应用

提出了一种新的结构振动控制装置，该装置具有隔震换能和主动控制的双重功能。将该装置安装在建筑结构的隔震层处，在地震、大风等外荷载激励下结构的隔震层将产生较大的相对运动，由此可以驱动该控制装置发挥作用。此时由计算机控制，根据控制效果的需要可以使得该装置在隔震换能和主动控制的两种工作状态之间适时切换。本文建立了该装置的数学模型，提出了建筑结构隔震换能控制系统的分析方法和控制策略，并给出了一个结构控制仿真分析的算例。     

最大Lyapunov特性指数在微弱信号检测中的应用

利用Duffing振子的运动状态来判断微弱信号的存在是一种常用的方法,通常此方法没有明确的门限。由于最大Lyapunov特性指数是指示动力学系统是否处于混沌状态的重要参数,所以将最大Lyapunov特性指数作为混沌判据引入基于Duffing振子的微弱信号检测中。利用最大Lyapunov特性指数指示Duffing振子所处的状态,如果最大Lyapunov特性指数大于1,测说明系统处于混沌状态,反之则处于周期状态,从而为此方法提供了更为直观的判断依据。仿真结果表明,采用最大Lyapunov指数作为判断依据可以更准确的判断微弱信号的存在,进而说明此方法的可行性。     

旋转摩擦诱发粘滑振动特性分析

把旋转体和与弹性梁固结的质量块作为一对摩擦副,研究了旋转摩擦诱发质量块的粘滑运动规律.理论分析和仿真结果表明,旋转摩擦诱发质量块的运动是周期性的非常规振动,其运动过程为质量块先随旋转体一起粘滞运动,然后沿粘滞运动方向滑动,再沿相反方向滑动,无论在粘滞期还是在滑动期,质量块都在运动.这一运动重复进行,直到质量块脱离旋转体或旋转体停止转动为止.     

A Modified Three-Term Conjugate Gradient Algorithm for Large-Scale Nonsmooth Convex Optimization

It is well known that Newton and quasi-Newton algorithms are effective to small and medium scale smooth problems because they take full use of corresponding gradient function’s information but fail to solve nonsmooth problems. The perfect algorithm stems from concept of ‘bundle’ successfully addresses both smooth and nonsmooth complex problems, but it is regrettable that it is merely effective to small and medium optimization models since it needs to store and update relevant information of parameter’s bundle. The conjugate gradient algorithm is effective both large-scale smooth and nonsmooth optimization model since its simplicity that utilizes objective function’s information and the technique of Moreau-Yosida regularization. Thus, a modified three-term conjugate gradient algorithm was proposed, and it has a sufficiently descent property and a trust region character. At the same time, it possesses the global convergence under mild assumptions and numerical test proves it is efficient than similar optimization algorithms.     

基于VXI总线的机载火控系统自动测试仪的设计

目的　对作战飞机火控系统的故障检测 ,传统的方法是使用多种检测仪器对机载火控设备进行性能检查 ,不仅技术含量低 ,也给飞机转场后技术阵地的转移带来不便 ,不能满足现代战争的需要 ,为提高战机的作战效能和快速反应的能力 ,研制了机载火控系统自动测试仪 .方法　采用 VXI总线技术、合理的硬件配置和在 Lab Windows/CVI环境下的软件模块化设计方案 .结果　在实际应用中取得了良好效果 ,为技术人员进行机载火控系统的性能及故障检测提供了便利 .结论　该测试仪具有测试结果准确 ,自动化程度高 ,工作稳定可靠 ,操作简便 ,易于转移和维护等优点 ,并具有较高的抗干扰能力 ,不仅适用与内场 ,还可用于在外场对机载火控系统进行原位检测     

Precision measurement and advanced technology

The role of that activity which goes by the various names of metrology, precision measurement, or measurement science is examined. The questions as to why it is important and why it merits the considerable financial and intellectual effort now devoted to it are also examined     

A Novel Instrument for the Measurement of the Thermal Conductivity of Molten Metals. Part I: Instrument’s Description

The paper reports the design and construction of a new instrument for the measurement of the thermal conductivity of molten metals and salts. The apparatus is based on the transient hot-wire technique, and it is intended for operation over a wide range of temperatures, from ambient up to 1200 K. The present experimental technique overcomes problems of convection and thermal radiation, and it is demonstrated that it operates in accord with a theoretical model. The uncertainty of the thermal conductivity results is estimated to be ±2% which is superior to that achieved in most earlier work.