ANTI-CORROSION TECHNOLOGY FOR FLUE GAS SEA-WATER DE-SULFURIZATION SYSTEM

以厦门嵩屿电厂4×300MW燃煤机组烟气海水脱硫系统的防腐蚀工程为例,探讨脱硫系统中防止海水与酸性烟气腐蚀的设备选材与防腐蚀工艺技术。Taking the flue gas sea water de-sulfurization(FGD) project of Songyu Power Plant with 4×300MW coal fired units as an example, the anti-corrosion technology for flue gas sea-water de-sulfurization system and the characters of the technology were introduced

基于一维TiO2纳米管阵列薄膜的β伏特效应研究

介绍了一种采用宽禁带半导体二氧化钛纳米管阵列薄膜材料制备β伏特效应同位素电池的方法.通过对金属钛片的电化学阳极氧化制备了垂直定向、有序排列的二氧化钛纳米管阵列薄膜,研究了退火条件对二氧化钛纳米管阵列薄膜半导体光电性能的影响.通过与镍-63辐射源的集成封装,形成三明治结构镍-63/二氧化钛纳米管阵列薄膜/钛片的β伏特同位素电池.实验结果表明,基于氩气氛围下450?C退火的黑色二氧化钛纳米管阵列薄膜具有高的氧空位缺陷浓度和宽的可见-紫外吸收光谱.在使用β辐射总能量为10 m Ci的镍-63辐射源时,同位素电池的开路电压为1.02 V,短路电流75.52 n A,最大有效转换效率为22.48%.国家自然科学基金(批准号:61574117);;深圳市科技计划项目(批准号:JCYJ20170306141006600)资助的课题~

基于神经网络混沌加密算法的专用芯片设计

根据一种基于神经网络混沌加密算法所提出的对称密钥密码方案 ,设计了一种安全实用的加解密专用芯片 .该芯片是采用 VHDL 语言设计的 ,并用 FPGAs实现 .文中主要介绍该加解密专用芯片的设计原理和方法

Simulation of surface topography considering process-machine interaction in grinding

磨削加工方法是保证加工表面质量的重要手段,机床结构与磨削过程之间存在的交互作用会对工件表面质量产生不利影响。以砂轮端面磨削加工过程为研究对象,在研究磨削工件表面形貌仿真方法的基础上,深入分析了机床结构与磨削过程之间交互作用对工件表面形貌的影响。首先基于砂轮表层磨粒的随机分布特性建立了虚拟砂轮形貌,然后通过对磨削过程中砂轮磨粒与工件几何干涉作用的分析,建立了磨粒运动轨迹方程和工件表面形貌方程。考虑砂轮变形对磨削过程的反向作用,建立了主轴-砂轮结构与磨削过程间的交互模型,采用耦合仿真的方法对机床-磨削交互过程进行了仿真,并考虑磨削过程中的交互作用提出了一种新的磨削工件表面形貌仿真模型,实验结果验证了所给算法的正确性和有效性,该方法为进一步优化磨削工艺参数提供了依据。Grinding is an important means to guarantee the quality of the machined surface,however,the interaction between machine and grinding process reduces surface quality. Focusing on face grinding,the influence of process-machine interaction on ground surface was analyzed based on the investigation of surface topography simulation. A visual wheel topology was simulated based on the random nature of grains located on the wheel surface. The grain trajectory equation and workpiece topography equation were established based on the analyses of interference between grains and workpiece. The interaction between grinding process and spindle-wheel was modeled considering the inverse influence of wheel deformation on process and simulated by adopting a coupling simulation method. Taking the processmachine interaction into account,a novel simulation model for surface topography of the grinding process was proposed.Grinding test verifies the accuracy and effectiveness of the given algorithm. The method can be further used to optimize the grinding process parameters.福建省高校产学合作科技重大项目“高效、高精度可转位刀片周边刃磨关键技术研究”(2014H6025

Impacts of storm event on DOM composition and flux in two Jiulong Tributaries with different watershed features

通过调查2014年7月"麦德姆"台风影响期间福建九龙江北溪(流域以林地为主)和西溪(农业流域和城市背景)下游定点站DOM的时间序列,测定样品的DOC含量及其吸收光谱和三维荧光光谱,以评估不同流域背景对河流DOM动力学降雨响应的差异性,并为流域-河口系统的一体化管理提供重要参考。降雨期间,两条河流DOC浓度、吸收系数aCDOM(350)以及总荧光强度均随径流量升高而增大,并在水位下降期持续增加,且西溪增加量明显高于北溪,说明受人类活动扰动大的流域河流有机质对暴雨事件的响应更为灵敏;北溪和西溪的SUVA254分别显示出增大和减小的相反变化趋势,表明林地背景的流域主要冲刷芳香度高的DOM到河流,农业和城市背景则相反;降雨期西溪对九龙江DOM入海通量的贡献率高于北溪,与基流期北溪贡献率占主导恰巧相反,这种碳通量的逆转表明暴雨事件会放大人类活动对下游河口生态环境的影响。Watershed features have great impacts on river DOM composition and flux. In this study, temporal variations in DOM of the North(dominated by forestland)and West(dominated by farmland and urban area)Jiulong River were investigated during the typhoon"Matmo"in July, 2014. The DOM was characterized by DOC, absorption spectroscopy, and fluorescence excitation emission matrix spectroscopy(EEMs)analysis. The DOC concentration, absorption coefficient aCDO(350)and total DOM fluorescence intensity of both rivers increased significantly in both rising and falling hydrograph during the storm event. However, DOM abundance in the West River showed a much greater increase than that in the North River, suggesting more sensitivity of river DOM to rainstorm events in the watershed with greater anthropogenic perturbation. The specific absorption coefficient(SUVA254)of CDOM showed different variation tends between the North and West River,indicating that river DOM in forest-dominant watershed had high aromaticity and average molecular weight. The West River showed higher fluxes of DOM than the North River during storm event, which was opposite to that under the base flow condition. This reversion in DOM export flux suggested that storm event could amplify the influence of human activities in the watershed on the receiving estuarine ecosystems.The present findings are of great significance for the integrated management of coupled river-estuary system.国家自然科学基金项目(41276064,U1305231

Effect of catalytic de-NO_x device on the emission characteristics of polycyclic aromatic hydrocarbon in flue gas

通过对装有选择性催化还原(SCR)脱硝装置的燃煤锅炉排放烟气中的多环芳烃(PAHs)进行测试,分析比较了工业锅炉排放的PAHs经过SCR脱硝装置前后的排放特性变化。实验结果表明,烟气催化脱硝装置促进了PAHs含量的增加,特别是低环多环芳烃含量的增加,并提高了其毒性当量,但对PAHs在气相与颗粒相的分布影响不大。The polycyclic aromatic hydrocarbons (PAHs) in flue gas emitted from a coal-fired power plant equipped with selective catalytic reduction (SCR) de-NOx device were determined. The concentrations and distributions of phase and type of PAHs in the flue gas at the outlet and inlet of the SCR device were compared. The results show that the SCR de-NOx device leads to the increase of concentrations and toxic equivalent of PAHs, especially the low rings of PAHs in the flue gas. However, the device has no significant influence on the PAHs partition between particle and the gas phase

Impact of discharge water from seawater flue gas desulfurization system of coal-fired power plant on the environment of surrounding sea area

进行了某4×300 MW燃煤锅炉的海水烟气脱硫(海水FGD)系统投运前后的海域监测。研究结果显示,海水曝气工艺可以较好地使脱硫后的海水水质得到恢复,除Hg必须引起严重关注外,排海海水的其他水质指标变化很小,附近海域所受影响甚微。The monitoring results of seawater samples from seawater flue gas desulfurization(FGD) system and surrounding sea area before and after running of seawater FGD system of a 4×300 MW coal-fired units in a coal-fired power plant have been presented.The results show that the aeration,mixing and dilution systems have obvious good function on sea water quality's resuming.Most of the water quality indexes remain unchanged and the discharge water has little effect on surrounding sea area except Hg to which more attention is needed.国家自然科学基金资助项目(20777063

Structural Characteristics and Sources of the Surface Sediments in Xiamen Coast

为研究厦门近海海域表层沉积物的结构特征、组成及来源,于2010年7月采集厦门湾表层沉积物,综合粒径分析、X射线衍射、扫描电镜等方法对沉积物进行表征。粒径分析的结果表明,沉积物的主体粒径在80μM附近,且有明显的次粒级峰,并以粗颗粒的主体粒级峰占有优势。研究的沉积物类型主要有三种,砂质粉砂、粉砂质砂和砂-粉砂,其中砂质粉砂是分布最广泛的沉积物类型区域沉积物,其含量达90%以上;而粘土含量以背景点鸡屿岛为最高,达到11.97%。X射线衍射分析表明,沉积物中优势轻矿物为石英、高岭石,部分区域含有石墨及一些零星分布的伊利石、海绿石和斜绿泥石。这些矿物组成显示了厦门湾海域表层沉积物具有较好的亲陆性,同时,其组成也受到了涨潮流的较大影响。沉积物形貌形态的研究发现,厦门湾沉积物组分较为复杂,其中含有多种藻类及其碎片(主要为硅藻)、矿物颗粒(高岭石)及未知名碎片;形状主要有孔状结构、层叠状结构、长条片状和不规则的六边形块状等。In order to study the structural characteristic,composition and source of the sediment in Xiamen coastal waters,the surface sediment in Xiamen Bay was collected in July,2010,and the samples were comprehensively analyzed by particle size analysis,X-ray diffraction,scanning electron microscopy and other methods.The results of the particle size analysis showed that the main diameter of the sediment was near 80 μm,with a pronounced secondary pea.There are three main types of sea sediments(sandy silt,silty sand,and sand-silt) and sandy silt is the most widely distributed type,which the content of the silt-sand at all study areas was nearly 90%,while the clay content was highest at the background point and reached to 11.97%.The X-ray diffraction analysis showed that the dominant light minerals in sediments were Quartz,Kaolinite;some areas contained Graphite.Illite,Glauconite and Clinochlore also had been found in some areas accidentally.The mineral composition showed the surface sediments had a good pro-land,meanwhile,it was affected by the flood current.While,the morphology study found that the composition of the sediments at the study areas were complex,containing a variety of algae and debris(mainly diatoms),minerals(kaolinite) and unknown debris.Cavernous structure,stack-like structure,long flake and irregular hexagon were the main shapes in these sediments.国家自然科学基金(41005082);近海海洋环境科学国家重点实验室青年访问学者基金(MELRS1017

基于Crossbar的多通道DMA控制器设计与实现

本文给出了一种基于Crossbar的多通道DMA控制器的设计方案,它能有效地提高DMA数据传输的效率和减少系统CPU的中断次数,保证多核SOC系统的任务执行效率及传输接口的通信实时性。经FPGA验证表明,所设计的多通道DMA控制器比传统的DMA有更好的效能及性价比