新型催化裂化槽式待生剂分配器的冷模实验

针对大型催化裂化再生强化的需要,本研究提出了一种新型的槽式待生剂分配器,在大型冷模实验装置上对其性能进行了系统的评价,并考察了不同操作条件和结构参数对主要性能指标的影响规律,最后和前期研究的两种传统分配器进行了性能对比。结果发现该型分配器只需操作气速大于临界表观气速即可达到得很高的颗粒分配均匀性和颗粒输送能力,而其他因素对其性能影响不大。考虑到工业圆形再生器的实际情况,提出了一个修正的不均匀指数,可以更好地满足工业待生剂分配器设计的需要。和传统船型和管式分配器的性能对比发现,新型槽式待生剂分配器不仅具有更好的颗粒分配均匀性,而且在颗粒输送能力和操作弹性两方面也具有显著的优势,其更本原因在于它更好地解决了分配器内颗粒的流动性问题。     

人防地下室结构施工质量控制要点

人防地下室工程具有平战两用工程,使用功能范围广,质量要求高,本文针对某人防地下室的施工过程和验收结果,提出几点质量控制要点来防止混凝土结构裂缝、渗水、漏气、沉降等质量问题。     

FCC认证实验室的注册程序及提交资料

介绍FCC认证实验室的申请程序,分析所需提交资料的内容。根据在实际申请过程中的经验,指出大家在准备资料时,有可能会忽略和遇到的问题,并提出解决方法。     

GPU上实现的向量点积的性能分析

CUDA是一种较为简便的利用GPU进行通用计算的技术。研究了GPU上基于CUDA的几种向量点积算法,比较、分析了每种算法的性能。实验表明,GPU上最快的算法比CPU上的算法快了约7倍。     

多功能炸药车在吊斗铲—抛掷爆破工艺中的应用

抛掷爆破对炸药产品及性能的苛刻要求,必然需要与其相配套的工艺及设备的支持,多功能炸药车的使用就是为了满足抛掷爆破对炸药多品种、高质量、高效率的要求。介绍了从澳瑞凯引进目前国内较为先进的多功能炸药车的组成、技术亮点及其应用。     

Pumped-storage unit commitment with considerations for energy demand,economics, and environmental constraints

Aside from their zero fuel costs, the pumped-storage units can reduce emissions of thermal generating units. The objective of this study is to investigate (a) thermal unit commitment with considerations for environmental constraints (ECUC), and (b) pumped-storage and thermal unit commitment with considerations for environmental constraints (PSECUC) based on a new optimization methodology. The PSECUC determines the start-up and shut-down schedules of pumped-storage and thermal generating units that meet the required demand so that the costs for fuel, start-up, and emissions (TC) are minimized. For the ECUC (thermal generating units only), the results show improvements of 0.03 and 0.50% in TC and excess emissions (EXEM), respectively. For the PSECUC, it is determined that 2-pumped-storage units can simultaneously decrease the TC and EXEM by 1.20 and 60%, respectively.     

炼厂催化裂化干气中稀乙烯资源利用综述

利用催化裂化于气中廉价的乙烯资源生产化工产品可增加炼厂经济效益。介绍了炼厂催化裂化干气稀乙烯的回收技术．包括变压吸附、配合吸收分离、中冷油吸收、先进回收系统、膜分离技术,并对这几种技术进行了比较。最后综述了我国以催化裂化干气为原料生产乙苯、丙醛、乙酸乙酯和氯乙烯的技术研发进展。     

有序合金中FCC→HCP相变温度内出现的缺陷

利用ＴＥＭ的高温台原位观察了Ｆｅ３Ｇｅ的相在７８０℃（在７００℃以上Ｌ１２转变为ＤＯ１９）出现缺陷的过程。实验发现首先形核的是外禀层错,外禀层错比孤立的内禀层比孤立的内禀层错扩展得快,并且扩展得较宽,它们有可能长大成为ＤＯ１９相的核胚。     

PCC升降式反应器的两种新式进料结构

Based on the analysis of flow characteristics of the FCC riser feedstock injection zone, two novel feedstock injection structures are put forward. By investigating three flow parameters in the feedstock injection zone under the three different structures (the traditional and the novel No. 1, No. 2 structures): the local density, the particle backmixng ratio, and the jet eigen-concentration, the flow feature under three structures were obtained. The experimental results demonstrate that the flow features under both proposed structures are obviously improved comparing with those under the traditional structure. Especially, the performance of the deflector-structured No. 2 is more desirable than that of No. 1.     

A 3D multilevel model of damage and strength of wood: Analysis of microstructural effects

A 3D hierarchical computational model of damage and strength of wood is developed. The model takes into account the four scale microstructures of wood, including the microfibril reinforced structure at nanoscale, multilayered cell walls at microscale, hexagon-shape-tube cellular structure at mesoscale and annual rings at the macroscale. With the use of the developed hierarchical model, the influence of the microstructure, including microfibril angle (MFA), the cell shape and the wood density (annual ring structure), differences between earlywood and latewood as well as microstructural arrangements and cellulose strength distributions on the tensile strength of wood is studied numerically. Good agreement of the theoretical results with experimental data has been obtained.