MODEL FOR PREDICTING THE LATERAL DISPERSION COEFFICIENT OF SOLIDS IN GAS-SOLIDS FLUIDIZED BEDS

The lateral mixing of solids in a gas-solids fluidized bed is very complicated.It can be caused by:(a)bubble movement through the bed,(b)bubble burst at the bed surface,and(c)gross particle circulation in thebed.However,experiments show that the major factors effected the lateral mixing of solids are the bubblemovement through the bed and the bubble burst at the bed surface.Thus a model with two mixing re-gions,i.e.mixing in bubble rising region and mixing in bubble breaking region,was proposed.Based on thismodel,an equation for predicting the lateral dispersion coefficient of solids in gas-solids fluidized beds wasderived without any adjustable parameter.The calculated values by this equation are well comparable withthe observed data including the present work and the other investigations.     

水平井分段均衡开采工艺管柱的研制

针对水平井开采过程中水平段动用不均衡的问题,开展水平井分段均衡开采工艺技术研究。详述水平井分段均衡开采工艺技术的设计思路、结构原理,以及技术的核心配套工具——分流装置的工作原理、室内实验等。该技术通过分采泵配合分流器shunt、插封分流开关、双向皮碗封隔器等组合成水平井分段均衡开采工艺管柱,通过选用不同型号分采泵、控制进泵前不同水平段油流通道,实现了对上下两水平段的均衡开采,充分发挥各水平段的潜力。     

基于N次谐波法的供油凸轮型线的拟合

采用N次谐波法反求电控单体集成泵的凹弧凸轮型线,利用MATLAB软件对凸轮型线进行曲线拟合,并根据拟合结果对供油凸轮性能进行分析。结果表明,在拟合过程中N的取值受限是造成截断误差的主要原因,因此可以通过增大N值来获得较高的拟合精度,在等速区段较大时,循环喷油量稳定,速度上升平稳。     

无线传感器网络多sink路由技术研究*

在介绍无线传感器网络路由协议的独有特点后,给出了传感器网络多sink路由协议的分类方法,然后着重分析了当前较为有代表性的多sink路由协议,在协议特点及其应用范围方面进行了研究与比较。最后,总结了多sink路由协议的研究的关键点及其发展趋势。     

Effect of Deflected Discs Thickness to the Damping Characteristic of Tube Shock Absorbers

Research is conducted on the relationship between thickness of deflected disc and damping force of tube shock absorbers. By analyzing performing characteristics of the throttling valve using throttling theory of small clearance space and thin place deformation theories, mathematical correlation between disc thickness and magnitude of damping force is formulated. Moreover, a rule concerning change of damping force in terms of disc thickness is concluded.     

Characteristics of oxygen consumption of coal at programmed temperatures

Oxygen consumption is an important index of coal oxidation.In order to explore the coal-oxygen reaction,we developed an experimental system of coal spontaneous combustion and tested oxygen consumption of differently ranked coals at programmed temperatures.The size of coal samples ranged from 0.18~0.42 mm and the system heat-rate was 0.8℃/min.The results show that,for high ranked coals,oxygen consumption rises with coal temperature as a piecewise non-linear process.The critical coal temperature is about 50%.Below this temperature,oxygen consumption decreases with rising coal temperatures and reached a minimum at 50℃,approximately.Subsequently,it begins to increase and the rate of growth clearly increased with temperature.For low ranked coals,this characteristic is inconspicuous or even non-existent.The difference in oxygen consumption at the same temperatures varies for differently ranked coals.The results show the difference in oxygen consumption of the coals tested in our study reached 78.6% at 100 ℃.Based on the theory of coal-oxygen reaction,these phenomena were analyzed from the point of view of physical and chemical characteristics,as well as the appearance of the coal-oxygen complex.From theoretical analyses and our experiments,we conclude that the oxygen consumption at programmed temperatures reflects the oxidation ability of coals perfectly.     

吉林省廉租住房管理研究

从吉林省廉租住房制度存在的问题入手,针对廉租住房制度存在的问题提出廉租住房建设的对策设计方法。希望通过对吉林省廉租住房研究,能够对其他老工业基地的廉租住房建设提供有益的借鉴作用。     

卷取温度对X80管线钢析出行为与性能的影响

观察了不同卷取温度下X80管线钢中析出物的情况,并结合其组织性能对比可知：在实验情况下,480℃卷取时,有大量细小弥散的Nb、V的碳氮化物析出物,起到了较好的析出强化作用.     

使用证据累积的文本聚类谱算法

针对谱聚类算法相似度函数设置困难问题,提出了一种使用证据累积的文本聚类谱算法.该算法使用超球K均值算法对文本集进行多次聚类,并将每次得到的划分结果作为判断2个文本是否应该放在一个簇中的证据,由此构建文本的相似度矩阵和正则化拉普拉斯矩阵.在TREC和Reuters文本集上进行了实验,验证了本文算法的有效性,它比层次聚类算法和CLUTO提供的K均值算法更加优越.     

煤岩组成与水煤浆成浆性能的关系研究

为了考察煤岩组成对成浆性能的影响,以惰质组含量较高的神府榆家梁煤为研究对象,采用重液离心法进行煤岩组分的分离和富集,配制出具有不同煤岩组成的制浆用模型煤样,然后在相同的条件下进行制浆试验,研究得出了煤岩组成与成浆性的定量关系.结果表明:成浆性随惰质组含量的增加和镜质组舍量的减少而先增加后降低,对于本试验所用的神府榆家梁煤,当惰质组含量大约为24%时制浆效果最好.