浸渍剂沥青

浸渍剂沥青是石墨电极生产的主要原料之一,由煤焦油或煤沥青经净化处理后进一步调制得到, 国内目前还处于开发应用阶段。山东济宁兖矿科蓝煤焦化有限公司现已实现了工业化生产,2001年第一季度已 生产浸渍剂沥青200t。     

一种浸渍沥青的应用

通常石墨电极的浸渍是用中温煤沥青做浸渍剂 ,由于煤沥青中富含喹啉不溶物（ＱＩ） ,直接影响浸渍效果 ,并为下工序出现废品埋下隐患。因此必须脱除其ＱＩ杂质 ,以使煤沥青浸渍剂在浸渍过程中能顺利地通过气孔浸润到石墨电极的内部去 ,达到最佳浸渍效果。本文主要讨论山东济宁煤化公司生产的首批浸渍剂与山东生建八三厂合作进行工业性浸渍试验的情况。１试验经分析成分后发现 ,喹啉不溶物（ＱＩ）的差异较大 ,中温煤沥青ＱＩ含量在７ %～１０ %范围内 ,浸渍剂中ＱＩ含量在０．６７ %～１．２６ %范围内。浸渍剂的质量指标如表１所示。先将浸…     

浸渍沥青性能及工艺研究

比较了用几种浸渍沥青和上海沥青作浸渍沥青生产的各工序制品的性能，考察了各种浸渍沥青的使用特性，探讨了电极生产厂对浸渍沥青的合理使用方法。     

浸渍剂沥青

针对炭素材料孔隙结构特点,提出了炭素生产用浸渍剂沥青的质量要求,着重讨论了浸渍剂沥青所含杂质对浸渍效果的影响,并介绍了国内外炭素生产用浸渍剂沥青发展状况。     

PC机在虹吸式行车排泥机上的全自动控制

排除积泥是平流式沉淀池生产运行中的重要环节，排泥机的工作情况直接关系到沉淀池的可靠运行和生产效率。虹吸式排泥机能有效地排除池底沉泥，但其自身用水量约为制水量的5％。在水资源日见馈乏的今天，能确保水质的前提下，节省排泥机的自身用水具有十分重要的意义。闵行水厂一车间自95年开始，采用PC机对排泥机进行技术改造，现已在全自动状态下经济运行，实测排泥机用水量可节约60％。1.排泥机工作情况闵行水厂一车间的平流式沉淀池，如图1所示，总长74米，排泥机以1米／分的速度在沉淀池两端间作固定程式往复运行，往返一次需时2.5小…     

沥青浸渍系统真空技术计算及设计更新措施

在总结某电炭厂“大型特种石墨沥青浸渍系统”工艺设计和调试工作的基础上，综述了沥青浸渍机理、技术更新措施、真空技术计算及验证。强调降低真空压强是增加浸入量的重要条件，通过真空系统计算，采取了提高真空度措施，相应地采用了低真空绝对压力测量仪表。     

浸渍废沥青的再生

对炭素厂浸渍后的废沥清再生的可能性进行了研究。研究表明浸后废沥青可以通过离心分离法脱除其中的固形杂质及喹啉不溶物，喹啉不溶物的脱除率与废沥青稀释剂的溶剂比有关，所得再生沥青的喹啉不溶物的含量均低于炭素厂对粘结剂和浸渍剂的要求。     

气体加压浸渍沥青液位固定及浸渍真空保持

炭素制品一次焙烧过程中压型电极中的黏结剂沥青只有50％左右转化为焦炭(沥青焦),所以生成的沥青焦的体积小于压型电极中沥青所占的体积,一次焙烧品体积密度1.55～1.67 g/cm3,气孔率般在21％～26％,大量气孔的存在必然对制品理化性能产生影响,因此需要浸渍.浸渍是在密闭的设备中,在一定的温度和压力作用下迫使液态浸渍沥青浸入炭制品孔隙(对制品气孔实施沥青填充)的工艺过程.     

浸渍剂沥青和黏结剂沥青渗透性对比研究

选择两类具有相近流变性能的黏结剂沥青和浸渍剂沥青,模拟炭材料的微孔分布测定了两类沥青的渗透率,对比研究了浸渍剂沥青和黏结剂沥青的渗透性能差异。结果表明,浸渍剂沥青的渗透性能远优于黏结剂沥青,浸渍剂沥青的渗透率为黏结剂沥青相应值的3.54~22.13倍,两类煤沥青的渗透性差异是由于其QI含量不同造成的,浸渍剂沥青极低的QI含量(0.2%以下)大大降低了煤沥青向多孔滤材中的渗透阻力,为提高浸渍效果创造了有利条件。     

细结构产品浸渍工序质量稳定性控制

简要概括细结构产品浸渍工序中质量稳定性控制的影响因素,并对浸渍工序中原料、条件、过程因素及其对浸渍工序的影响作简要的分析探讨。     

我国耐火材料真空油浸技术的现状与未来

对我国耐火材料行业的真空浸渍工艺及设备现状进行了分析,介绍了国产化真空油浸装备及工艺特点。指出今后应积极倡导推广应用高温、高压,符合环保要求的真空油浸工艺及装备。     

NSH型全自动热膨胀仪计算机测控系统

介绍了NSH型全自动热膨胀仪计算机测控系统的软硬件构成及功能。该系统具有可靠性高,控制灵活,性能价格比高,运行维护方便等特点。     

The effect of the substrate on pitch wetting behaviour

The wetting behaviour of a petroleum pitch (modified with a surfactant) and a binder coal-tar pitch was studied using different substrates. The results show that both the pitch and the substrate have a significant influence on wetting behaviour, and consequently, on their mutual interactions during the mixing stage. Low values of surface tension and viscosity in the pitches lead to lower wetting temperatures. It was found that with petroleum coke and magnesia as substrates, the wetting occurs at lower temperatures than with graphite and carbon black for all pitches. Moreover, experiments carried out with amorphous and crystalline alumina revealed that the crystalline order affects the wetting behaviour considerably. Thus, whereas the pitch wets the corundum (crystallized alumina), it does not wet the amorphous alumina (basic, acid and neutral alumina).     

On-line automatic optical inspection system for coarse particle size distribution

A new online automatic optical inspection system (OAOIS) using digital image processing has been developed to measure the coarse particle size distribution. The OAOIS is composed of particle separation module, image acquisition module, image processing and analysis module and PC/PLC-based electric control module. Experiments were performed with non-uniform particles (1-100 mm). The particle size distribution, number of the particles, and accumulated weight percentages of particles are obtained by using the developed system. The experimental results show that the repeated precision of accumulated weight percentages is around ± 1%. To improve the reliability and accuracy of the OAOIS measuring results, the linear regression equation is applied to mapping the result of OAOIS to that of traditional net sieving system (TNSS). It has been shown that the developed system has a high accuracy and precision for coarse particle sizing distribution.     

红外自动测温系统在7.63m焦炉的应用

针对当前焦炉加热制度的特点,开发了红外自动测温系统。该系统能够准确测量焦炉立火道的温度,并根据温度变化趋势,瞬时调节暂停加热时间,从而达到精确调节燃烧室温度,提高炉温均匀性,并有效降低焦炉耗热量的目的。     

A solution for the full impregnation of asbestos: The use of an epoxy polymer resin

Asbestos has been identified as priority substance for risk reduction and pollution prevention given its carcinogenic effects. Because of its wide occupational exposures and widespread use in commerce in the past, there is a big concern that it may present a general health hazard. Therefore, the identification of asbestos‐containing materials and their neutralization has become a topic plan of social prevention and intervention in many European and American countries. If the presence of asbestos in buildings (i.e., schools) is detected, the abatement program usually accomplishes the removal of the asbestos‐containing materials and displacement in controlled waste disposals (ex situ technique). Removal has many disadvantages: high costs, large production of toxic refuses, high risks of exposure for removal workers, and high risk of environmental pollution during and after the operations. Thus, the search for alternative in situ techniques has been recently promoted and full impregnation seems to be the best candidate given its reduced risks for both workers and environment, and its low costs. In this paper, a technique for the in situ full impregnation of asbestos by an epoxy polymeric resin is proposed, and the results of its application for the neutralization of either chrysotile or amphibole asbestos‐containing materials is described. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 713–720, 2000     

煤浆自动跟踪系统在氧煤比调节中的应用

阐述了水煤浆气化装置在运行过程中,高压煤浆泵多次出现不打量造成气化炉过氧和跳车问题的分析和总结,通过采用煤浆自动跟踪系统,快速克服因煤浆泵不打量而造成的煤浆流量大幅扰动问题,达到气化炉安全稳定运行的目的。     

基于RS485通讯的微机监测系统

介绍了一种应用带通讯口的智能仪表和工控机,组成的基于RS485通讯的微机监测系统。该系统简单实用且性价比高。     

宣钢焦化厂焦炉自控系统优化改造

为满足工艺控制要求,对焦炉加热执行机构、加热控制系统变送器、自控系统PC柜、控制室电脑操作台、熄焦池液位测量设备、集气管压力调节设备、交换机程序进行改造和完善,改造后焦炉自控系统运行稳定,焦炉控制自动化程度提高。