粉煤灰滤料基本性能分析研究

粉煤灰是电厂和其他大型工业企业的废料,资源量大,价格低廉。用其作为水处理滤料,吸附性能好,有良好的性价比。文章对粉煤灰吸附原理进行了阐述说明,并从碘吸附值的角度,将粉煤灰滤料与活性炭以及其它滤料在性能上进行了分析比较。结果表明,粉煤灰滤料不仅在吸附性能上具有不劣于活性炭等滤料的能力,而且在经济指标上占有明显的优势,具有广阔的应用前景。     

耐高温磁性玄武岩滤料的制备及捕集微细颗粒物研究

依次采用浸渍法与原位聚合法在玄武岩纤维表面均匀负载铁酸钴(CoFe_2O_4)纳米粒子,后经充磁处理后制备成磁性玄武岩功能滤料。在此基础上,分别采用SEM、VSM、FTIR、XRD等表征方法分析了磁性玄武岩滤料中CoFe_2O_4纳米颗粒的分布形态、剩磁及矫顽力大小、纤维表面官能团的作用机制及CoFe_2O_4负载结晶度。接着将原位聚合法制得的磁性玄武岩滤料在高温中处理24 h,并依次对原始玄武岩滤料、磁性玄武岩滤料及高温处理的磁性玄武岩滤料进行过滤性能实验。结果发现:相较于浸渍法,通过原位聚合法制备的磁性玄武岩滤料剩磁更强,CoFe_2O_4纳米粒子负载结晶度更好;250℃高温处理的磁性玄武岩滤料过滤性能最佳,对PM2.5的过滤效率达到了92.1%,相较原始玄武岩滤料提高了33.9%;同时原始玄武岩滤料过滤阻力低于磁性玄武岩滤料,但随着滤料粉尘负荷的增大,磁性玄武岩滤料的磁性粒子对滤料过滤阻力的影响变小。     

河南丁东水处理滤料厂

主要产品 无烟煤滤料，石英砂滤料，磁铁矿滤料，活性炭、锰砂滤料，焦炭滤料，核桃壳滤料，麦饭石滤料，铝矾土、伸缩器、卵石、砾石、果壳滤料，陶粒滤料，石榴石滤料，双层陶瓷滤砖。     

河南丁东水处理滤料厂

无烟煤滤料，石英砂滤料，磁铁矿滤料，活性炭、锰砂滤料，焦炭滤料，核桃壳滤料，麦饭石滤料，铝矾土、伸缩器、卵石、砾石、果壳滤料，陶粒滤料，石榴石滤料，双层陶瓷滤砖．     

以煤矸石为原料的水处理滤料的研制

研究了一种以煤矸石为主要原料,通过添加适量成型剂、膨胀剂,经高温烧结生产球型多孔轻质污水处理滤料的制造方法,并以滤料的比表面积、孔隙率为主要因子,考察原料配比、升温方式、成球时水加入量、终温及终温煅烧时间等参数对滤料理化性能的影响.结合扫描电镜分析了滤料微观结构,并对煤矸石烧结膨胀成孔机理进行了分析.通过正交试验确定了最佳工艺参数.主要配方为:煤矸石50-99%,粉煤灰0-25%,膨胀剂0.5-1.0%.所得成品滤料主要性能参数为:比表面积6.0-8.6m2/g,孔隙率40-50/%,堆密度0.9-1.1g/cm3,磨损率<2.0%,平均孔径85-190/μm.以煤矸石为原料生产球型多孔轻质污水处理滤料具有原料来源广泛、生产工艺简单、无污染、成本低、产品附加值高等特点,其生产可以利用现有水泥厂的生产设备与工艺转产.     

凹凸棒复合滤料对亚甲基蓝的吸附研究

以凹凸棒土为主要原料合成凹凸棒复合滤料,并对其对亚甲基蓝的静态吸附性能进行研究。实验研究了吸附时间、吸附剂投加量、初始浓度、pH值及温度对凹凸棒复合滤料对亚甲基兰吸附效果的影响,并对吸附结束后的凹凸棒复合滤料进行再生实验。结果表明,凹凸棒复合滤料吸附亚甲基蓝在1．5h可达平衡。在温度为30℃条件下,吸附剂对20mg／L亚甲基兰溶液吸附率可达99．36％。吸附等温线可用Langraulr方程描述,吸附速率方程符合准二级动力学方程。凹凸棒复合滤料通过再生后可以反复使用。     

硅烷偶联剂KH570改性TiO2超疏水滤料的制备与性能

通过溶胶-凝胶法以钛酸四丁酯为前驱体,醋酸为催化剂制备TiO₂溶胶,利用γ-甲基丙烯酰氧基丙基三甲氧基硅烷（KH570）对其进行低表面能修饰,得到疏水改性的TiO₂溶胶,然后喷涂到滤料表面使其具有超疏水性。对改性前后滤料的润湿性、表面形貌、化学成分和过滤性能进行分析。结果表明：改性涂层均匀沉积在滤料表面,将纤维表面完整包裹,改性后滤料的水接触角达156.29°。在过滤风速为0.043~0.127 m/s时对粒径为0.3 μm的颗粒进行过滤性能测试,改性后滤料的过滤效率比未改性滤料平均增加2.7672%,过滤品质因数增加0.34%,提高了滤料的过滤性能。此外,在经50次砂纸磨损循环和30 h酸碱溶液浸泡后,疏水滤料仍具有超疏水性。通过清洁煤粉污染的表面发现改性滤料具有优异的自清洁性能。     

新型微孔膜滤料的制备与除尘性能测试

针对常规除尘器滤料压力损失增长快、易磨损、易粘袋等问题,采用环氧树脂、丙酮、二乙烯三胺、有机玻璃树脂、无水乙醇等化学试剂对无纺布滤料基材进行表面改性处理,制备出新型微孔膜滤料;在对其孔径分布、透气性能、力学性能、过滤性能以及形貌结构等进行实验分析的基础上,探讨微观结构与除尘性能的关系。结果表明:无纺布滤料基材经表面改性处理后,新型微孔膜滤料的孔径尺寸为5～50μm,透气性略为降低、过滤精度和力学性能明显提升,机械强度增加;过滤风速在1.2 m/min以下时,新型微孔膜滤料的全尘过滤效率≥99%;分级过滤效率受粉尘粒径大小影响较小,对PM_(2.5)的分级过滤效率≥96%;静态过滤压损随着过滤风速的增大而增大,动态过滤压损随着过滤时间的增加而增大;新型微孔膜滤料的过滤方式为表面过滤,表面附着的三维网状光滑膜层能提高过滤精度,充当粉尘初层,降低动态过滤压损,减少粉尘沉积,提高过滤效率,降低清灰难度。     

河南丁东水处理滤料厂

主要产品●无烟煤滤料,石英砂滤料,磁铁矿滤料,活性炭、锰砂滤料,焦炭滤料,核桃壳滤料,麦饭石滤料,铝矾土、伸缩器、卵石、砾石、果壳滤料,陶粒滤料,石榴石滤料,双层陶瓷滤砖.●聚合氯化铝净水剂,铝酸钙粉,软性填料,组合填料,半软性填料,立体弹性填料,串孔填料,蜂窝填料,纤维球     

河南丁东水处理滤料厂

主要产品 无烟煤滤料，石英砂滤料，磁铁矿滤料，活性炭、锰砂滤料，焦炭滤料，核桃壳滤料，麦饭石滤料，铝矾土、伸缩器、卵石、砾石、果壳滤料，陶粒滤料，石榴石滤料，双层陶瓷滤砖．     

提高车速表试验台联网测试精度研究

介绍了车速表试验台联网设计的实现原理,分析了影响车速台测量精度的因素,提出一种采用多媒体定时技术与软件滤波技术相结合提高测量精度的方法。多媒体精确定时器是微软公司提供的对底层硬件定时器的API支持,定时精度高,受系统影响小;软件滤波采用平均滑动滤波方法,较好地除去了测量结果中的不准确数据。通过试验验证了这种方法的有效性。     

叠片式微孔膜过滤器的研制

介绍了叠片式过滤器的结构,性能特点,应用范围和开发前景。叠片式过滤器由不锈钢或塑料空心圆盘做骨架,将片状滤材堆叠堆安装组成,具有耐高温,低阻力,耐压强度高,反冲性能好,运行费用低等特点,在压缩空气过滤,高污染液体过滤等场合均有很好的应用前景。     

COMPARATIVE SIZE DISTRIBUTION AND FILTER PENETRATION MEASUREMENTS OF DOP AND CORN OIL AEROSOLS

The use of corn oil as an alternative aerosol base in instruments for testing respirators and filters has been recommended by NIOSH as a safe substitute to Di-ethylhexyl phthal-ate (DOP) which is thought to be a potential biological co-carcinogen. Experimental measurements of the thermophysical properties related to aerosol size distribution and filter penetration have been conducted using photometry, inertial impactors, and laser spectrometry. Aerosols were generated using a pneumatic generator that combined the concepts of the Laskin nozzle and Wright nebulizer systems under various conditions of pressure, temperature and relative humidity and were evaluated for particle size distribution and filter penetration. Experiments demonstrated that heating corn oil from 20^°C to 40^°C has a minimal effect on size distribution and mass whereas DOP showed a greater sensitivity to temperature with respect to the same properties. These evaluations also demonstrated that corn oil produced a stable, smaller, and more consistent aerodynamic size distribution than DOP at the comparative experimental conditions. Comparable filter penetration characteristics obtained by experimental observations strongly show that corn oil aerosols are justified as an alternative aerosol for DOP. Enhanced performance coupled with safety considerations suggest that corn oil is an acceptable substitute for DOP especially in those applications of testing human subjects such as quantitative fit testing.     

微光像增强器信噪比测试技术研究

对一台进口的微光像增强器信噪比 (SNR)测试仪进行了改造 ,重新研制和设计了测试仪的信号处理模块、计算机系统和测试软件 ,采用硬件滤波、软件数字滤波和快速傅立叶变换 (FFT)相结合的方法实现了像增强器信噪比测试。利用研制的测试仪对多种型号的像增强器的信噪比进行了测试 ,给出并分析了测试结果。     

Estimation Performance for the Cubature Particle Filter under Nonlinear/Non-Gaussian Environments

This paper evaluates the state estimation performance for processing nonlinear/non-Gaussian systems using the cubature particle filter (CPF), which is an estimation algorithm that combines the cubature Kalman filter (CKF) and the particle filter (PF). The CPF is essentially a realization of PF where the third-degree cubature rule based on numerical integration method is adopted to approximate the proposal distribution. It is beneficial where the CKF is used to generate the importance density function in the PF framework for effectively resolving the nonlinear/non-Gaussian problems. Based on the spherical-radial transformation to generate an even number of equally weighted cubature points, the CKF uses cubature points with the same weights through the spherical-radial integration rule and employs an analytical probability density function (pdf) to capture the mean and covariance of the posterior distribution using the total probability theorem and subsequently uses the measurement to update with Bayes’ rule. It is capable of acquiring a maximum a posteriori probability estimate of the nonlinear system, and thus the importance density function can be used to approximate the true posterior density distribution. In Bayesian filtering, the nonlinear filter performs well when all conditional densities are assumed Gaussian. When applied to the nonlinear/non-Gaussian distribution systems, the CPF algorithm can remarkably improve the estimation accuracy as compared to the other particle filter-based approaches, such as the extended particle filter (EPF), and unscented particle filter (UPF), and also the Kalman filter (KF)-type approaches, such as the extended Kalman filter (EKF), unscented Kalman filter (UKF) and CKF. Two illustrative examples are presented showing that the CPF achieves better performance as compared to the other approaches.     

Degree of polarization estimation in the presence of nonuniform illumination and additive Gaussian noise

Within the general framework of active imaging we address the degree of polarization (DOP) estimation in the presence of additive Gaussian detector noise. We first study the performance of standard DOP estimators and propose a method to increase estimation precision using physically relevant a priori information. We then consider the realistic case of nonuniform illumination distribution. We derive the Cramer-Rao lower bound and determine a profile likelihood-based estimator. We demonstrate the efficiency of this new estimator and compare its performance with other standard estimators as a function of the degree of nonuniformity of the illumination.     

基于形态滤波与灰色关联度的滚动轴承故障诊断

针对滚动轴承故障振动信号的强噪声背景与故障样本不易大量获取的问题,提出一种基于形态滤波与灰色关联度的滚动轴承故障诊断方法。采用形态闭与形态开相减构成的差值滤波器对故障信号进行滤波,不需要考虑振动信号的频谱特征与分布,即能够有效的提取故障频率特征;灰色关联度分析方法对小样本模式识别问题具有良好的分类效果,适用于滚动轴承的故障模式识别。首先对故障信号进行形态滤波,然后提取滤波后信号的故障特征频率的归一化幅值作为特征向量,最后通过待识别样本与标准故障模式的关联度来对故障模式进行分类。实例表明该方法能够取得良好的效果。     

蒸发冷却填料的空气净化性能研究进展与前景分析

介绍了蒸发冷却填料过滤器的除尘原理和优越性能,对空调机组用填料的种类及分类进行总结并给出了其在实际应用中对水质的要求及影响,综述了蒸发冷却填料的空气净化性能的国内外研究现状,并结合其湿式除尘的工作原理及特点,预测了蒸发冷却空调系统在提高除尘效率方面的主要发展方向。     

穿孔结构流体滤波器参数优化设计研究

本文提出了利用遗传算法对穿孔共振结构的滤波器进行了多参数优化计算 ,得出在已知脉动频率下 ,不同的流体介质中 ,穿孔共振结构滤波器的最优参数 ,为穿孔共振结构流体滤波器的使用提供了较好的设计方法。本文还对一实际穿孔结构滤波器进行了实验研究 ,证明本文的理论计算与参数优化方法的正确性