燃煤电厂新型静电布袋复合除尘器的开发与气流分布试验研究

提出一种新的燃煤电厂静电布袋复合除尘器，分析其技术经济特点，并提出一些需解决的技术闯题。其中静电除尘单元与布袋除尘单元之间的结合形式是一个技术难点，将影响整个除尘系统的效率和布袋的使用寿命。研究开发出一套气流分布试验台，采用一定形式的气流分布板进行冷态试验研究，分析了几个关键截面的流场，掌握了气流分布规律，确定了气流分布板的开孔分布，为进一步进行中试试验和实现工程化奠定了基础。研究表明，采用具有独创性的结合形式后，该新型静电布袋复合除尘器应用于工程后将具有非常大的经济和环保优势。     

加入CH4促进选择性非催化还原的CFD模拟研究

在实验研究和机理分析基础上利用计算流体动力学(computational fluid dynamics,CFD)软件Fluent,结合简化的反应机理模型,对沉降炉脱除NOx实验过程进行了模拟研究。模拟结果表明,在较低反应温度(1 073 K)下,喷入的氨基还原剂基本不与烟气中的NOx反应,形成较高的氨泄漏;而在较高的反应温度(1 373 K)下,喷入的氨基还原剂部分被烟气中的氧气氧化为NOx,导致NOx脱除效率较低。加入微量CH4能够促进较低温度下的选择性非催化还原(selective non-catalytic reduction,SNCR)反应,并减少氨泄露。在较高温度下SNCR反应速率加快,仍有部分NH3被氧化为NOx,但总体NOx脱除效率有所提高。模拟结果与实验结果的对比分析表明,采用简化的反应模型和CFD结合可以对常规SNCR反应和加入CH4的脱除NOx反应过程进行较为准确的模拟。     

Web上分布式领域组件的框架表示

文章采用知识表示中的框架表示法,结合谓词产生式,语义网络等手段,提出了一个具有网络分布式及Ｗｅｂ化构造特性的领域构架及组件的表示方法ＦＲＤＤＣ。应用ＦＲＤＤＣ实现的ＡＮＤ－ＣＡＳＥ模型表现了ＦＲＤＤＣ的自然性,结构性,Ｗｅｂ可操作性,容纳柔性及知识表达能力。     

基于DF-OFDM多中继系统功率分配的梯度算法

DF-OFDM技术必将成为现代移动通信的核心技术,但是合理地进行功率分配是必须要解决的问题之一。传统的二分法,大多在精确度和计算量之间很难取舍。在移动通信系统抗信道衰落和提高信道容量方面,协作通信是一种很好的解决方案。针对改进型的多中继DF-OFDM系统,对一种降低计算量的梯度算法进行了简单的介绍与分析,并与二分法进行了比较。仿真结果表明,在功率约束的条件下,梯度法要优于二分法。     

基于CMI及差分电流的紫外读出集成电路的研究

本文提出了一种基于电流镜镜像积分(CMI)及差分电流结构的GaN紫外探测器读出电路结构,分析了该读出电路结构的工作原理及特点.通过SPICE对电路结构进行了仿真验证,结果显示该读出电路结构可以对探测器的光响应电流信号进行有效的读取.     

Preparation of Mo2C by MPCVD and Its Photocatalytic Properties

Mo2C was prepared by microwave plasma chemical vapor deposition(MPCVD)technique with the power of 800 W and pressure of 18 kPa. Compared with traditional prepar...     

供应链渠道价格控制的动态博弈分析

从制造商和经销商在供应链中的合作性市场关系出发,运用Stackelberg博弈思想,通过利润模型,推导出制造商批发收入中给经销商的返利比例与渠道价格之间的关系式,并对其经济意义作出了一定分析.     

Effect of Intake Air Humidification and EGR on Combustion and Emission Characteristics of Marine Diesel Engine at Advanced Injection Timing

The trade-off between NO_x-soot and ISFC (Indicated Specific Fuel Consumption) brings new challenges for the development and application of innovative techniques that could reduce the NO_x-soot emissions of diesel engine simultaneously with the lowest possible fuel penalty.In this study,the two coupling measures,advanced SOI (start of injection) respectively coupled with intake air humidification (IAH) and EGR,were used to achieve lower NO_x-soot emissions than the original engine while minimizing the increase in ISFC.Numerical studies were conducted on a four-stroke supercharged intercooled marine diesel engine under 75%loads at 1350 r/min by using AVL Fire code.The advanced SOI varied from 14.5°CA BTDC to 20°CA BTDC;humidity ratio ranged from 0 to 100%in increments of 20%,and EGR rate ranged from 0 to 25%in increments of 5%.The technical route to achieve Tier III emission standards was also analyzed in this paper.The result indicates that lower in-cylinder pressure,temperature and NO_x emissions,higher ISFC and soot emissions are observed when only IAH or EGR technology is applied,while opposite trends are found when only using advanced SOI.The proper combination of different SOI respectively with humidity ratio and EGR rate can improve the trade-off relationship between NO_x and soot.Meanwhile,the increase in ISFC is improved by using advanced SOI under high EGR rate or humidity ratio.Compared with the advanced SOI coupled with EGR,advanced SOI coupled with IAH results in less loss of ISFC.Analysis results reveal that both above-mentioned coupling measures can achieve low NO_x-soot emissions while ensuring that ISFC does not increase.As expected,there are nine combinations of advanced SOI coupled EGR that can achieve NO emissions to meet the Tier III standard,while advanced SOI coupled IAH has only one combination to meet this regulation.     

T-NTRU物联网动态接入认证技术

物联网终端安全接入认证是保证电力物联网大规模建设的关键性技术.传统认证方案通常采用的椭圆曲线密码算法,计算量大,不能抵抗量子攻击.数论研究单元算法可以抵抗量子攻击,与椭圆曲线密码采用点乘算法相比,计算速度快.因此提出了一种时间变换数论研究单元算法物联网动态安全接入认证算法,使用动态变化时间序列通过哈希函数产生动态密钥,...