Thermo economic evaluation of oxy fuel combustion cycle in Kazeroon power plant considering enhanced oil recovery revenues简

Oxy fuel combustion and conventional cycle （currently working cycle） in Kazeroon plant are modeled using commercial thermodynamic modeling software. Economic evaluation of the two models regarding the resources of transport and injection of carbon dioxide into oil fields at Gachsaran for enhanced oil recovery in the various oil price indices is conducted and indices net present value （NPV） and internal rate of return on investment （IRR） are calculated. The results of the two models reveal that gross efficiency of the oxy fuel cycle is more than reference cycle （62% compared to 49.03%）, but the net efficiency is less （41.85% compared to 47.92%） because of the high-energy consumption of the components, particularly air separation unit （ASU） in the oxy fuel cycle. In this model, pure carbon dioxide with pressure of 20~ 105 Pa and purity of 96.84% was captured. NOx emissions also decrease by 4289.7 tons per year due to separation of nitrogen in ASU. In this model, none of the components of oxy fuel cycle is a major engineering challenge. With increasing oil price, economic justification of oxy fuel combustion model increases. With the price of oil at $ 80 per barrel in mind and $ 31 per ton fines for emissions of carbon dioxide in the atmosphere, IRR is the same for both models.     

Effects of coagulation bath temperature on structure and performance of poly （vinyl butyral） hollow fiber membranes via thermally induced phase separation

Poly （vinyl butyral） （PVB） hollow fiber membranes were fabricated via thermally induced phase separation （TIPS）. The effects of coagulation bath temperature （CBT） on the structure and performance of membranes were investigated in detail. The morphologies of the membranes were studied by scanning electron microscopy （SEM）, the performances of water permeability, rejection, breaking strength and elongation were measured, respectively. The results indicate that all the membranes have the asymmetric morphology and the thickness of the skin layer decreases and the pore size of the outer layer increases with the increase of CBT. The permeability of membranes prepared at air gap 1.0 cm and take-up speed 0.253 m/s increases from 1.047×10-7 to 5.909×10-7 m3/（m2·s-kPa） with the CBT increasing from 20 ℃ to 40℃, and sharply increases to 35.226×10 7 m3/（m2.s.kPa）once the CBT arrives at 50 ℃. While the carbonic ink rejections have no significant decrease, totally exceed 98%, but that of acid-maleic acid copolymer greatly decreases with the increase of CBT. Both the breaking strength and elongation decrease with the increase of CBT.     

Effects of expanding zone parameters of vacuum dust suction mouth on flow simulation results

Based on the parametric analysis of the expanding zone of the vacuum dust suction mouth, the flow in the vacuum dust suction mouth was simulated by computational fluid dynamics （CFD） software, Fluent. The effects of the expanding zone parameters on flow simulation were analyzed. The results show that simulation effects depend on threshold values of the expanding zone parameters of the dust suction mouth, and the threshold values of the expanding zone can be obtained according to the different structures of the vacuum dust suction mouth and be selected as the geometric parameters in calculating, and also corners of the expanding zone make unobvious difference in calculation accuracy and in computational efficiency compared with no corner. The simulation results provide practical guidance to the flow simulation on the dust suction mouth.     

Correspondence of bubble size and frother partitioning in flotation

The size of bubbles created in the flotation process is of great importance to the efficiency of the mineral separation achieved. Meanwhile, it is believed that frother transport between phases is perhaps the most important reason for the interactive nature of the phenomena occurring in the bulk and froth phases in flotation, as frother adsorbed in the surface of rising bubbles is removed from the bulk phase and then released into the froth as a fraction of the bubbles burst. This causes the increased concentration in the froth compared to the bulk concentration, named as frother partitioning. Partitioning reflects the adsorption of frother on bubbles and how to influence bubble size is not known. There currently exists no such a topic aiming to link these two key parameters. To fill this vacancy, the correspondence between bubble size and frother partitioning was examined. Bubble size was measured by sampling-for-imaging （SFI） technique. Using total organic carbon （TOC） analysis to measure the frother partitioning between froth and bulk phases was determined. Measurements have shown, with no exceptions including four different frothers, higher frother concentration is in the bulk than in the froth. The results also show strong partitioning giving an increase in bubble size which implies there is a compelling relationship between these two, represented byCFroth/CBulk andD32. TheCFroth/CBulk andD32 curves show similar exponential decay relationships as a function of added frother in the system, strongly suggesting that the frother concentration gradient between the bulk solution and the bubble interface is the driving force contributing to bubble size reduction.     

Dynamic cluster member selection method for multi-target tracking in wireless sensor network简

Multi-target tracking（MTT） is a research hotspot of wireless sensor networks at present.A self-organized dynamic cluster task allocation scheme is used to implement collaborative task allocation for MTT in WSN and a special cluster member（CM） node selection method is put forward in the scheme.An energy efficiency model was proposed under consideration of both energy consumption and remaining energy balance in the network.A tracking accuracy model based on area-sum principle was also presented through analyzing the localization accuracy of triangulation.Then,the two models mentioned above were combined to establish dynamic cluster member selection model for MTT where a comprehensive performance index function was designed to guide the CM node selection.This selection was fulfilled using genetic algorithm.Simulation results show that this method keeps both energy efficiency and tracking quality in optimal state,and also indicate the validity of genetic algorithm in implementing CM node selection.     

水翼剖面多目标粒子群算法优化

船舶螺旋桨及舵均由水翼剖面组成,为了提高桨、舵的水动力性能,需要对水翼进行优化设计,以便得到水动力性能更好的桨及舵。提出一种基于线性权重处理的多目标优化算法,以降低阻升比和改善水翼表面压力分布为优化目标,将其应用到多目标水翼优化中。分别选取不同的攻角、不同翼型和不同的翼型表达函数进行优化设计。优化后得到的新翼型相对于原始翼型,具有低阻生比和较低的最小负压力系数,提高了翼型的升力效率和空泡性能。因此,验证了提出的多目标粒子群算法能够应用到多目标翼型优化设计的可行性。     

中国航空航天制造业自主创新效率研究

为了有效测度和探索中国航空航天制造业的自主创新效率及其模式,以我国21个地区1995-2010年期间航空航天制造业的产业自主创新活动为研究对象,通过运用三阶段DEA-Windows模型对我国各地区航空航天制造业的产业自主创新效率进行了实证研究。研究结果表明:通过剔除环境变量和随机扰动因素的影响可以更准确地测度产业自主创新效率;从结构特征的聚类分析结果来看,我国航空航天制造业产业自主创新效率存在4种模式;从收敛性分析结果来看,各地区航空航天制造业的产业自主创新效率σ收敛。     

基于Mahout的个性化推荐系统架构

针对互联网企业的实际和用户需求,构建一种基于Mahout的个性化推荐系统架构。通过分析网站的数据特点,将数据分为静态数据和动态数据。当数据量不大时,根据数据特点选用Mahout单机内存推荐算法进行计算;当数据量很大时搭建分布式集群,将业务系统的静态数据定时地增量导入到Hadoop的HDFS中,然后用Mahout分布式推荐算法访问HDFS。计算后的结果,保存到业务系统的数据库中,与动态数据合并作为在线响应的输出。实验证明该方案可以绕过海量数据的高并发在线分析的问题,有效地缓解系统响应时间的压力。     

H型静电聚结分离器油水分离技术研究

介绍了国外新一代高效紧凑型静电聚结设备———H型静电聚结分离器CES的结构和工作原理。通过对其油水分离的工作机理进行理论分析,探讨了运行中临界流量产生的原因和影响因素,提出了进行工程化设计时应注意的问题和改进思路,对于自主开发新型静电聚结技术,满足石油行业对高效紧凑型原油脱水设备的需求具有积极意义。     

超纯氢纯化技术示范成功

近日,中科院大连化物所甲烷高效转化新材料与新过程研究组开发的高性能金属钯复合膜材料,在超纯氢气纯化技术示范上获得成功,示范规模为30 m3/h氢气。该团队采用纯度为99.99956%的氢气作为原料,其中含杂质氮气3.81×10-6,杂质二氧化碳0.6×10-6,在保持91.8%氢气回收率条件下,产品氢气纯度达到99.9999996%,其中氮气含量为4.3×10-9,未检出二氧化碳。在稳定性考察过程中,24 h