在烟道中脱除NOx 并生成HNO3 的方法

为了解决目前气体电离放电脱硝方法存在的等离子源体积庞大、能耗高、NO_x 脱除率低以及需要依靠传统脱硝方法的协同作用等问题, 拟用小流量、高浓度的氧活性粒子[O₂⁺, O(¹D),O(³P), O₃]、引发剂HO₂^- 分别注入烟道中, 与烟气中水反应生成·OH, 在无吸收剂、催化剂、氧化剂及其他技术协同作用下, 实现了烟道中·OH 快速氧化脱除大烟气量中的微量NO_x 并生成HNO₃ 溶液的整个反应过程, 等离子体反应管道长度为1~8 m. 实验结果表明, 氧活性粒子与NO_x 摩尔比值决定了脱除率, 摩尔比选择在2~3 为宜, 此时NO_x 脱除率将达到95%左右, 回收酸液中NO₃^-回收率达到58.1%; NO_x 脱除率随着实验气体温度增高而下降; O₂ 含量增加对脱硝效果有20%左右的影响; H₂O含量大于4%时脱硝率处于最高值. 可见本方法不但解决气体电离放电脱硝存在的问题, 同时又为大气污染治理提供一种绿色新方法.     

热处理对Fe基合金丝巨磁阻抗效应的影响

采用高频感应加热熔融快淬法拉制玻璃包裹的 Fe 基非晶合金细丝,采用温度退火制备纳米晶丝;利用真空镀膜法制作了纵向驱动微型线圈;研究不同退火温度下合成的Fe基合金丝在纵向驱动方式下的巨磁阻抗(GMI)效应.结果表明:对玻璃包裹的Fe基合金非晶丝采用不同退火温度处理,可以不同程度消除材料中的残余应力,提高材料的软磁性能,...     

广西山豆根化学成分的研究

对产于广西靖西的山豆根化学成分进行研究,采用硅胶柱层析、重结晶等分离手段从中分离纯化得到10个化合物,通过现代波谱技术和理化常数测定鉴定了它们的结构,分别为:高丽槐素(maackiain 1),红车轴草苷(trifolirhizin 2),苷草素(liquiritigenin 3),7,4'-二羟基黄酮(7,4'-di...     

Numerical simulations of self-propelled swimming of 3D bionic fish school

Numerical simulations of self-propelled swimming of a three dimensional bionic fish and fish school in a viscous fluid are carried out.This is done with the assistance of a parallel software package produced for 3D moving boundary problems.This computational fluid dynamics package combines the adaptive multi-grid finite volume method,the immersed boundary method and VOF (volume of fluid) method.By using the package results of the self-propelled swimming of a 3D bionic fish and fish school in a viscous fluid...     

Effect of Fe(Ⅲ) impurity on the electrochemical performance of LiFePO_4 prepared by hydrothermal process

Lithium iron phosphate(LiFePO4)was synthesized from LiOH,FeSO4 and H3PO4 by a hydrothermal process at 180℃.The samples were characterized by X-ray diffraction,scanning electron microscopy and chemical analysis.Electrochemical performance of the samples was tested in terms of charge-discharge capacity and cycling behavior.The results indicated that Fe(Ⅲ) impurity had obviously effect on the electrochemical properties of LiFePO4,and the formation of Fe 3+ was caused by the oxidation of Fe 2+ in the dissolving...     

Sorption of Pb(Ⅱ) from aqueous solution by konjac glucomannan beads

Konjac glucomannan beads have been investigated as metal biosorbent for Pb(Ⅱ)from aqueous solutions.The effect of contact time,solution pH,initial metal concentration,and desorption were studied in batch experiments at 20°C±2°C. Maximum mental sorption was found to occur at initial pH 4.0-5.5.Kinetic studies revealed that the initial uptake was rapid and equilibrium was established in 3 h and that the data followed the prseudo-second order reaction.The equilibrium sorption data at initial pH 4.0 were descri...     

Process optimization of reaction of acid leaching residue of asbestos tailing and sodium hydroxide aqueous solution

Silica is the major component of the acid leaching residue of asbestos tailing.The waterglass solution can be prepared by the reaction of the residue with sodium hydroxide aqueous solution.Compared to the high temperature reaction method,this process is environmental friendly and low cost.In this paper,the reaction process of the residue and the sodium hydroxide aqueous solution is optimized.The optimum reaction process parameters are as follows:the usage of sodium hydroxide is 26.4 g/100 g acid leaching residue,the reaction temperature is 90℃,the reaction time is 1 h,and the ratio of the liquid/solid is 2.0.The significance sequence of the process parameters to the alkali leaching reaction effect is the usage of sodium hydroxidethe ratio of the liquid/solidthe reaction timethe reaction temperature.The significance sequence to the leaching ratio of SiO2 is the ratio of the liquid/solidthe usage of sodium hydroxidethe reaction timethe reaction temperature.The significance sequence to the modulus of the sodium silicate is the ratio of the liquid/solidthe usage of sodium hydroxidethe reaction timethe reaction temperature.Under the optimum conditions,the leaching ratio of the SiO2 is 77.5%,and the modulus of the sodium silicate is 3.15.The XRD analysis result indicates that the major components of the alkali leaching residue are serpentine,talc,quartz and some albite.     

Effect of the silicon powder content on the properties of Al_2O_3-SiC-Me composites

By means of transient plastic phase process,the Al2O3-SiC-Me composites were produced throungh adding metal aluminium and silicon-powder to Al2O3-SiC materials.Under the condition of the same content of silicon and aluminium mixed-powder,the effect of silicon powder addition on properties of Al2O3-SiC-Me composites was studied by means of XRD and EPMA analyses in the temperature range of 300°C-1600°C.The results indicated that the content of metal phase in the sample at 1600°C increases with increasing silicon powder content.At the same time,when the temperature is lower than 1100°C,the strength of samples gradually increases with increasing temperature.However when the temperature is higher than 11000°C,the strength of samples gradually decreases with increasing temperature,and this change is very small.The results also indicated that at the same sintering temperature,the sample with 6%silicon powder has the maximum strength.     

基于离散Fourier变换的非线性滤波图像去噪算法

传统的低通滤波去噪算法在滤除噪声的同时会使图像边缘模糊,为了更好地保留图像的边缘信息,该文提出了一种保留具有较大模值的Fourier变换系数的非线性滤波方法．实验结果表明,该算法在滤除噪声的同时还能较好地保留图像的边缘信息。     

A New Method of Structuring the Hierarchy of a System

Structuring the hierarchy of a system is an important link of solving problems with the analytic hierarchy process. This paper gives and proves the two theorems about the relationship between the hierarchy and the reachability matrix of the system. On the basis of it, we propose a method of structuring hierarchy by directly using the reachability matrix of the system. This method is simpler and clearer than that of interpretive structural modeling and is suitable for both manual calculating and computer proceeding. It fully shows the simplicity of the AHP.