Detection of Multiple Blockages in Parallelized Microreactors

In a plant consisting of parallelized microreactors (MRs), the product quality is lowered because of a lack of flow uniformity among them when blockage occurs. It is not practical to install sensors in every MR from the viewpoint of cost when detecting the blocked MRs. In the previous study, the multiple blockage detection (MBD) method using a small number of sensors was proposed, but its performance became low when the number of sensors decreased. Here, the conventional algorithm for MBD is improved by considering the process behavior on blockage occurrence, and the effectiveness of the improved algorithm is demonstrated through a numerical case study. The effects of flow distributor types and sensor types on the MBD performance are numerically investigated.     

甲醇制烯烃(MTO)反应器分布管堵塞原因分析及措施

为解决反应器分布管堵塞导致分布管压差上涨问题,寻求解决方法。对影响反应器分布管堵塞的因素,如MTO装置急冷水、水洗水、浓缩水、废甲醇水、压缩机段间凝液等进行试验和对分布管堵塞原因进行分析。通过优化污水汽提塔操作,控制污水汽提塔塔顶出料冷后温度高于120℃,将污水汽提塔塔顶的低温冷却器切换至高温冷却器和控制较低的pH值(8.0),减少了堵塞物的生成;对不凝气及浓缩水进行工艺改造优化了污水汽提塔的操作,解决了反应器分布管的堵塞问题。含有一定浓度醛酮类物质的浓缩水,在碱性环境中可以发生缩聚反应,在污水汽提塔系统内生成交联物,导致反应器分布管的堵塞。     

精己二酸装置洗涤塔堵塞物剖析研究

采用发射光谱仪、元素分析、原子吸收、差热、热重、扫描电镜等方法,分析研究了辽阳石化分公司(LYPC)精己二酸装置洗涤塔填料上的堵塞物。堵塞物中含有的化学元素有C,H,N,Fe,Ni,Ca,Na,Cu等,以CaCO3等结垢物和微生物等形态存在。推断了堵塞物的形成原因是洗涤水长期循环累积和微生物的沉积。研究了除去堵塞物的方法,在工艺上,采用63%的浓硝酸除去了堵塞物;采取了向洗涤水中加入杀生剂和新型阻垢剂的预防措施,取得了良好的效果。     

WWW的信息监控研究

WWW是Internet上进行信息交换的系统。面对WWW日益严重的信息污染问题．信息监控势在必行。本文给出了WWW的信息监控模型，分析了信息监控的各种技术，讨论了当前信息监控面临的问题。     

SLP油层解堵剂的研究与应用

SLP油层解堵剂包括SLP-1和SLP-2两种药剂。本文对SLP-1和SLP-2的性能进行了评定,提出了SLP油层解堵剂的施工配方与施工工序,介绍了SLP的解堵机理与现场应用情况。SLP油层解堵剂可解除油层中BaSO_4、SrSO_4等酸难溶盐及高分子量有机物质的堵塞。     

我国油田化学堵水调剖剂开发和应用现状

本文分八大类简述了国内各种堵水调剖剂的性能，研究及应用简况，对今后堵水调剖剂的研究提出建议。     

体制因素制约电信公司"走出去"战略

在目前的国际大环境下,中国电信企业要走出去,必然遭到一些发达国家的打压和围堵、技术封锁和全球一体化对中国在建立区域性经济联盟上的负面影响.电信企业要走出去面临的攻坚课题包括：注重知识产权问题、公司的国际化改造、改善用人机制、协调国家总体战略和公司决策之间的关系等.     

220t/h锅炉过热器管破裂分析

某220t／h锅炉高温过热器管在试运行时发生破裂。采用金相检验、化学分析及热处理试验等手段对裂管进行了解剖分析。结果表明，由于有一种富碳物质堵塞了过热器管道，致使堵塞区域出现超温现象，并使该区域的管内壁生成一层共析组织，大大降低了管材的力学性能，最终导致管道破裂。     

Investigation of the performance of a staggered configuration of tidal turbines using CFD

This paper investigates the influence of wake interaction and blockage on the performance of individual turbines in a staggered configuration in a tidal stream farm using the CFD based Immersed Body Force turbine modelling method. The inflow condition to each turbine is unknown in advance making it difficult to apply the correct loading to individual devices. In such cases, it is necessary to establish an appropriate range of operating points by varying the loading or body forces in order to understand the influence of wake interaction and blockage on the performance of the individual devices. The performance of the downstream turbines was heavily affected by the wake interaction from the upstream turbines, though there were accelerated regions within the farm which could be potentially used to increase the overall power extraction from the farm. Laterally closely packed turbines can improve the performance of those turbines due to the blockage effect, but this could also affect the performance of downstream turbines. Thus balancing both the effect of blockage and wake interaction continues to be a huge challenge for optimising the performance of devices in a tidal stream farm.     

多元解堵技术在白于山区块的研究与应用

长庆油田白于山区块经过多年开采,目前部分油井产量递减迅速,分析认为主要是由于该区块井温相对偏低,原油开采过程中有机和无机沉淀析出（结垢）导致储层部分孔喉堵塞。室内对该区块原油和堵塞物成分分析,结果显示堵塞物成分复杂。针对堵塞物不同特性,开发出一套多元解堵体系,实验结果表明反应4h时,多元解堵体系对该区块垢样溶蚀率比土酸体系溶蚀率提高了14%,对白于山区块岩心平均伤害率为-17.1%。现场试验表明多元解堵技术对白于山区块油井堵塞有明显针对性,能有效提高该区块油井单井产量。