一种新型高效的精馏器——折流式超重力旋转床

介绍了一种新型、高效的精馏设备——折流式超重力旋转床的结构、性能及其在工业生产连续精馏中的应用。工业生产表明,在相近的操作条件下,一台直径为830 mm、高度仅为0.8 m的折流式超重力场旋转床的分离效果与10多米高的填料塔相当,可达15~20块理论板,而设备的占地面积不足2 m2,展示出了良好的应用前景。     

煤层气资源可采性的综合评价

煤层气资源储量是煤层气开发最基本的物质基础和最关键的地质控制因素,而煤层气的可采性是实践煤层气开发的根本前提。文章首先对影响煤层气资源开采的地质因素进行了归类提纯,在此基础上根据不同矿区工作面煤层的实际测量参数建立了煤层气资源可采性的评判模型,为不同矿区煤层气资源开发实践提供了参考依据。     

流化床表观粘度测量研究现状

流化床表观粘度是确定流化性能的重要参数,其测量技术研究一直为许多研究者所关注。概述了国内外学者对流化床表观粘度的测量研究现状,重点介绍了他们在粘度测量中采用的方法和得到的结论,并提出流化床表观粘度测量技术的发展方向。     

基于LP和Markov过程的眼科病床安排模型

针对某眼科医院病人排队等候时间长的问题,运用Markov生灭过程构建合理评价指标体系,并利用具有约束条件的线性规划方法设计了病人平均住院时间最短的病床安排模型I,给出各类病人入院的大致时间区间.考虑周六、日不安排手术或病床比例大致固定等模型深入的问题时,对病床安排模型I作出相应的调整与评价.最后,基于缩短病人平均逗留时间给出了病床安排模型II和病床分配比例.     

同步脱氮微氧颗粒污泥的快速培养及供氧条件的影响

为了快速培养出能同时去除生活污水中化学需氧量(COD)和氮的微氧颗粒污泥,采用膨胀颗粒污泥床(EGSB)反应器接种污水处理厂剩余污泥,研究了微氧颗粒污泥的培养过程以及稳定运行条件下供氧量对处理效果和污泥性能的影响。结果表明,水力停留时间(HRT)为6h,微氧颗粒污泥的成功培养仅需1个月;供氧速率在2.8³.2gO2/d,COD,NH3-N和总氮(TN)的去除率最高分别可达91%,85%和81%,脱氮速率达1.7gN/d,出水水质最佳;成熟的微氧颗粒污泥粒径集中在0.453.2gO2/d,COD,NH3-N和总氮(TN)的去除率最高分别可达91%,85%和81%,脱氮速率达1.7gN/d,出水水质最佳;成熟的微氧颗粒污泥粒径集中在0.45²mm,当供氧速率低于2.3gO2/d时,颗粒污泥结构致密,供氧速率在2.32mm,当供氧速率低于2.3gO2/d时,颗粒污泥结构致密,供氧速率在2.3³.2gO2/d时,污泥性能稳定,供氧速率增加到3.2gO2/d时,污泥沉降性能下降,并出现颗粒解体和丝状菌生长优势。     

HF反应转炉高温烟道气与精馏、脱气塔余热利用实践

为了充分利用 HF 转炉高温烟道气的热量,将现有精馏再沸器加热系统进行改造,采用循环热水加热取代原蒸汽加热,循环热水再与烟道气进行热交换,回收利用烟道气的余热,达到节能的效果。余热利用系统改造实施后不仅显著降低装置的蒸汽消耗,同时提高了精馏加热操作的稳定性,大幅延长了再沸器的使用寿命。     

单位分数的一个简单性质的应用

介绍了单位分数的一个简单性质,并以129为例,给出了单位分数化循环小数的方法。     

施工企业内源融资问题探讨

解决施工企业融资问题是企业关注的首要问题。从内源融资特点分析和与外源融资，提出企业应着重于内部资金的积累与扩大，即将融资的重心放在内源融资上，并进一步提出改善内源融资现状的途径。     

Experimental study on the spatial distribution of particle rotation in the upper dilute zone of a cold CFB riser

Particle rotation plays an important role in gas-solid flows. This paper presents an experimental investigation on the spatial distribution of average rotation speed for glass beads in the upper dilute zone of a cold circulating fluidized bed （CFB） riser. It is shown that in the horizontal direction, the average rotation speed in the near-wall area is larger than that in the center area, while in the vertical direction, it decreases as the height increases. The reason resulting in this distribution is analyzed by considering several factors including particle size, particle shape, particle number density, particle collision behavior, and the surrounding flow field, etc. The effects of CFB operation conditions on the spatial distribution of average rotation speed are also studied. The results show that the increasing superficial gas velocity increases the average rotation speed of particles in the near wall area but takes nearly no effect on that in the center area. The external solids mass flux, however, takes the opposite effect. It is found that the average rotation speeds of particles in both areas are increased as the total amount of bed material increases.     

Study on performance of a packed bed latent heat thermal energy storage unit integrated with solar water heating system

INTRODUCTION Efforts of rational and effective energy man-agement, as well as environmental considerations, increase the interest in using renewable energy sources, especially solar energy. Because of discrep-ancy between the energy supply and demand in solar heating applications, a thermal energy storage (TES) device has to be used for the most effective utilization of the energy source. Energy storage combined with solar collectors and photovoltaic systems have been developed over the…