共查询到19条相似文献,搜索用时 203 毫秒
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《精细与专用化学品》2016,(3)
随着绥中36-1油田进入生产中后期,部分注水井在注水过程中出现了压力上升,注水量低,导致无法满足配注要求。现场换管柱作业中发现管柱内存在大量垢样,导致管柱及地层严重堵塞。垢样分析结果显示,垢样中包括有机物和无机垢。实验使用复合解堵工作液对垢样进行溶解,结果表明,复合解堵工作液对现场取得垢样有良好的溶解效果,并在现场应用中取得了良好的作业效果。 相似文献
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为了认识催化裂化烟气轮机垢样和预测垢样形成原因,选择新鲜剂、待生剂、平衡剂、三旋细粉和催化烟机垢样代表催化裂化催化剂全生命周期,采用X射线衍射、X射线荧光、扫描电镜、同步热分析和激光粒度分析技术,得到新鲜剂、待生剂、平衡剂、三旋细粉和催化烟机垢样样品的元素组成、晶相结构、表面形貌、差热曲线和粒径分布等物性分析数据。通过对比各样品分析结果,发现催化剂全生命周期中金属元素和非金属元素的富集和脱离规律与低熔点化合物存在关联关系,得出垢样中Y型分子筛发生晶格变化的结论,预测多种低熔点化合物和烟机工艺条件是导致烟机结垢的根本原因,这些结果可以为后期机理研究奠定基础。 相似文献
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中国石化股份公司九江石化公司化肥装置停工大检修,发现化肥氮气压缩机组、空气压缩机组和热电3#发电机组的汽轮机叶片上均有不同程度的结垢现象,质量管理中心分别取氮压机和汽轮发电机叶片垢样进行化验检测,分析数据中酸不溶物分别为90.1%和95.2%,垢样具体分析数据如下: 相似文献
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根据敞开式70.4m3PVC聚合釜循环水系统垢样组成、成垢原因分析以及以往在线清洗的经验,适时选择停车化学清洗。通过对各项运行数据的分析和比较证明此法效果明显,保证了70.4m3PVC聚合釜循环水系统的正常、高效运行,值得在行业内推广应用。 相似文献
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目前沉积物(污垢)组分分析没有现成的标准分析方法,系统故障诊断和清洗非常困难。为了解决这一问题,本文利用系统工程理论,构建了由基础分析体系和随机分析体系组成的污垢综合分析体系,对垢样组分分析,定性诊断系统的腐蚀、结垢、堵塞等障碍。研究了由X射线荧光光谱(XRF)无标样半定量分析及定性评估确定随机分析体系组成,马弗炉协同ICP-OES准确定量并直接读取基础分析体系和随机分析体系组分含量,污垢综合分析体系测定含量合计在100%±5%(5%为误差合计)为有效,结果归一化;然后根据垢样分析结果及垢样外观,结合工况,通过诊断技术,诊断系统障碍并及时整改。以某煤化工企业水洗水换热器和液氨蒸发器调节阀门污垢为例,XRF测定垢样康普顿线比率在0.967~0.981,说明结果可靠,由此确定随机分析体系组成;ICP-OES测定各组分元素工作曲线相关系数均在0.999以上,线性较好,由此准确定量各组分含量,各元素在垢样中的检出限为0.0004%~0.0010%。垢样中的各种成分的含量均反映某种倾向,通过现场工况和诊断技术,查找故障原因,经整改措施后及时解决了系统故障。研究结果表明:污垢综合分析体系及诊断技术能全面、客观、系统地反映垢样组成;并简便高效、快速准确分析和诊断煤化工换热器、过滤器、塔、管道、阀门等污垢的组分及系统故障。 相似文献
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A new flame spread apparatus for the measurement of flame spread rates at different ambient temperatures is presented. A 2‐m long sample is pre‐heated with air to the desired temperature and ignited from its lower end with a small propane burner. The flame spread is traced with thermocouples in contact with the sample surface. The features and function of the new apparatus are described, as well as series of vertical flame spread experiments on cylindrical birch rods and electrical cables made of polyvinylchloride (PVC) and flame retardant non‐corrosive (FRNC) materials. Vertical flame spread rates 6–62 mm/s (temperature range 22–271 °C) were determined for birch samples, 3–24 mm/s (22–190 °C) for PVC cable samples, and 0–4 mm/s (22–293 °C) for FRNC cable samples. Small‐scale experiments with thermogravimetric analysis and cone calorimeter were performed to characterize the sample materials in terms of their thermal and fire behaviour. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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I. M. Fijał-Kirejczyk J. J. Milczarek M. J. Radebe F. C. de Beer G. Nothnagel J. Żołądek-Nowak 《Drying Technology》2013,31(8):872-880
The application of modern digital neutron radiography in the study of the drying process in porous media is demonstrated with two simple examples of cylindrical and rectangular samples made of different materials. The statistical method of image analysis is presented and the standard deviation of grey scale values (referred to brightness) is shown to be a useful measure of receding drying front emergence. The motion of the drying front was analyzed and found neither linear nor proportional to the square root of time and was delineated with nonlinear functions different for each sample shape. 相似文献
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研究了差热定量分析面积法的准确性和不同物料样品粒度对定性差热分析的影响。研究结果表明:对不同样品,粒度在20-250目范围时,昨用差热分析作定性分析,样品粒度对分析结果基本无影响,但用差热分析作定量分析时,要控制合理的样品粒度。 相似文献
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概述了恶草酮产品的性能、用途及市场需求,确定了恶草酮投资项目产品方案,生产规模及工艺技术,并作了经济分析。 相似文献
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How atomic force microscopy has contributed to our understanding of polymer crystallization 总被引:1,自引:0,他引:1
Over the past two decades atomic force microscopy (AFM) has become one of the most frequently used tools for studying polymer crystallization. The combination of high resolution, minimal sample preparation and the ability to image non-destructively has allowed visualisation of crystallization, melting and re-ordering processes at a lamellar and sub-lamellar scale, revealing complexities that could only previously be guessed at. Here the insights that AFM has provided into some of the main over-arching questions relating to polymer crystallization are reviewed. The emphasis is on the use of AFM to image growth in real time, and on contributions that have been made to our understanding of polymer crystallization in general, rather than to specific systems. 相似文献
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In order to calculate the true volume intrusion of mercury into the pores of a sample, a correction must be made to the observed intrusion to account for the compression of the sample cell, mercury and sample. A theoretical analysis of this correction is presented which is shown to overcome the inadequacies of the usual corrective measure of running a blank experiment in the absence of a sample or on a non-porous sample. The equations derived involve the mercury fill volume in the sample cell, the compressibilities of the mercury, glass and sample and the solid volume of the sample. 相似文献