A301型低温低压氨合成催化剂使用情况小结

介绍了A301型催化剂在NC型φ1000合成塔内件中采用高效快速还原方法还原的基本方案及催化剂运行近3年的基本情况，并对A301型催化剂及NC型内件使用效果做了总结。     

NC型φ1200轴—径向氨合成塔内件在我厂的应用

我厂原合成氨年生产能力为6万t,经1992年配套改造达8万t。随着化肥新技术的不断发展,在投资不多的情况下对现有生产装置进行适当改造,合成氨年生产能力可提高至12万t。但氨合成塔能力偏小。我们通过对国内外各种氨合成塔内件考查、分析、论证,决定选用南化研究院研制的NC型中1200氨合成塔内件,该塔于1998年2月22日升温还原结束,投入正常生产。1改造前的情况1．1改造前的流程及设备简况在采用NC型氨合成塔内件以前,合成是典型的后置锅炉流程,氨合成塔内件是YD型十1000全轴向冷激式内件。合成图主要设备见表1。表1合成图主要设备一…     

ZA-5型氨合成催化剂升温还原总结

详细介绍了ZA－5型氨合成催化剂首次在NC型轴径向内件中的升温,还原过程。     

NC型氨合成塔内件平面温差产生原因及处理方法

分析了NC型氨合成塔内件平面温差产生的原因 ,主要有内件制造缺陷、内件组装质量不好 ,以及系统工况条件控制不当等。给出了平面温差产生原因的判断与处理方法     

Φ1000氨合成系统技改总结

简要介绍了Φ1000氨合成技术改造中，分别采用NC型二轴-径塔内件、混装球形催化剂、分层还原方案、聚结式高效油分内件、优化提温型流程及主副线遥控调节等诸项新技术。     

NC型Ф1000轴-径向氨合成塔内件在我厂的应用

介绍了NC型Ф1000轴-径向氨合成塔内件的特性和使用情况。结果表明：该装置具有操作稳定、阻力小、产量高，及明显的节能效果等特点。     

NC型Φ1 000轴-径向氨合成塔内件在我厂的应用

介绍了 NC型Φ 10 0 0轴 -径向氨合成塔内件的特性和使用情况。结果表明 :该装置具有操作稳定、阻力小、产量高 ,及明显的节能效果等特点。     

Φ100氨合成系统优化设计

介绍Φ 1000氨合成系统采用NC型两轴一径内件,优化设备配置,优化工艺流程设计,采用DSC优化自动控制设计。     

冷激式氨合成塔内件选型考察报告

本文是根据1990年度山西省级星火计划“冷激式合成塔内件新技术推广”项目的要求,开展选型考察工作而编写的报告。通过对NC620-Ⅱ型、YD型、XF-ⅢJ型三种冷激式内件的设计、生产、使用单位的实地考察,并对新内件的生产能力、增产节能效果和改造投资费用等进行了综合对比。经过论证,提出了选型意见和建设。可供选用冷激式内件的厂参考。     

NC型轴-径向氨(甲醇)合成塔的开发与应用

叙述了合成塔的发展过程，介绍了NC型轴-径向塔的开发思路及开发过程中的技术关键。工业应用表明，使用该塔（尤其内件）可提高氨净值，降低塔阻力，且对催化剂有较好的适应性。认为应制定相应的塔及其内件的设计与制造标准。     

NC74-1型氨合成催化剂的升温还原及应用

介绍了NC74-1氨合成催化剂在山东华鲁恒升化工股份有限公司大氮肥氨合成的装填、升温还原及使用情况。     

A301型氨合成催化剂在NC—1020合成塔内件中的应用

根据Ａ３０１型催化剂的具体特点，介绍了该催化剂在兴平化肥厂ＮＣ－１０２０合成塔内件中的装填，还原情况及应用效果。     

NC208型甲醇催化剂在φ500mm合成塔上的应用

本文重点介绍ＮＣ２０８型甲醇催化剂首次在工业装置上使用所取得的经济效益，并阐述了在升温还原和正常生产过程中应注意的事项。     

Effect of nitrocellulose (NC) on morphology,rheological and mechanical properties of glycidyl azide polymer based energetic thermoplastic elastomer/NC blends

As a new kind of propellant binder, energetic thermoplastic elastomer (ETPE ) can improve propellant recyclability and environmentally friendly disposal. The rheological behavior of the ETPE binder can be beneficial to identify suitable and safe conditions for processing ETPE propellants. In this paper, ETPE /nitrocellulose (NC ) blends with different mass ratios of NC to ETPE were prepared by the physical mixing method. The heat of explosion and the morphological, thermal, mechanical and rheological properties of the resulting blends were studied systematically. It was found that the heat of explosion of ETPE /NC blends increased with increasing NC content. SEM images showed that the NC domains in the blends changed from tiny pieces to fibers with increasing NC mass ratio, which indicates phase separation in the blends. The tensile mechanical properties of the blends had a peak value when the NC content was 10 wt%, and then increased with the increasing addition of NC . The thermal behavior made clear that the ETPE and NC were partially miscible. Rheological studies on dynamic strain sweep and frequency sweep demonstrated that the content of NC in the blends had a monotonic effect on their rheological properties at 130 °C. Rheological studies also showed that the rheology of the blends is dependent on temperature. The Cole ? Cole and Han plots confirmed phase separation in the blends. © 2016 Society of Chemical Industry     

Synergistic reinforcement of nanoclay and carbon black in natural rubber

The synergistic reinforcement of nanoclay (NC) and carbon black (CB) in natural rubber (NR) has not been much studied. Therefore, the reinforcement mechanism was probed using synchrotron wide‐angle X‐ray diffraction and transmission electron microscopy (TEM) observation and analyzed in terms of tube model theory. A synergistic effect in reinforcement between NC and CB was proved by the marked enhancement in tensile strength from 11.4 MPa for neat NR to 28.2 MPa for NR nanocomposite with 5 wt% NC and 20 wt% CB. From a study of crystallization under deformation it was found that crystallization plays a less important role in the reinforcement of NR/NC/CB. Analysis using tube model theory provided more evidence for the synergistic effect. NR containing a combination of NC and CB exhibited an increase of topological tube‐like constraints in comparison with NR/CB. That is to say, in NR/NC/CB nanocomposites, a CB–NC local filler network, as indicated by TEM images, induced a more entangled structure in which mobility of rubber chains was hindered for lateral fluctuations by the presence of neighboring chains. The synergistic reinforcement of NC and CB in NR/NC/CB nanocomposites can be reasonably understood as due to the formation CB–NC local filler networks. Copyright © 2010 Society of Chemical Industry     

数控生产线实现更高效率的方法

本文以Y4102型柴油机体为例，讲解了如何通过合理确定零件的加工工艺流程、优化数控程序的编制，来实现数控生产线的更高效加工。     

基于Nx6.0和VERICUT的数控加工仿真应用

数控仿真是数控加工模拟虚拟环境中的反映,能为产品的可制造性分析提供关键数据。在对手机电极实际零件数控加工的基础上,介绍了以NX6.0和VERICUT软件相结合作为仿真平台。实现加工刀位轨迹仿真和机床仿真同步实现。结合手机电极的加工实例实现了数控加工仿真的全过程。为复杂曲面零件的生产提供了有力依据。     

Methylcentralite concentration profiles in monoperforated extruded nitrocellulose and nitrocellulose/nitroglycerine propellant grains by Raman microspectroscopy

Raman microscopy was used to determine the methylcentralite (MC) concentration profiles diffused into single-base (nitrocellulose) (NC) and double-based (nitrocellulose/nitroglycerine) (NC/NG) small-arms propellant grains. External and internal concentration profiles were determined by measuring the concentration of MC relative to the NC and NC/NG at 5-μm intervals into the grain from the edge inward and the perforation edge outward. The external profile was constant with a diffusion and interaction mechanism, i.e., a level concentration of deterrent through the outer region of the grain followed by a gradual dropoff in concentration with distance into the grains, whereas the internal profile was found to be dependent on perforation size with either a diffusion and interaction mechanism profile or a gradual decrease in concentration profile.     

基于Delcam软件在数控加工中的应用

数控加工技术已得到广泛应用。如数控铣削、镗削、车削、线切割、电火花加工等。为了使数控设备达到预期的加工效果。编制高质量的数控加工程序是必不可少的。利用Delcam软件中的Power Shape模块建立零件的几何模型。利用Power Mill模块可以交互式地模拟演示材料按数控刀轨数据被去除的过程,可迅速自动生成数控G代码。缩短编程人员的编程时间,提高程序的正确性和安全性。降低生产成本。提高工作效率。