基于PCS7与SMPT-1000的连续过程控制系统设计

以SMPT-1000实验平台的混合罐、反应器、闪蒸罐、冷凝罐为被控对象,仿真了连续过程系统,综合考虑系统工艺参数、安全性、稳定性的要求,分析反应过程的特性,设计了控制回路和开车顺序,采用西门子PCS7系统设计了一套可行的控制方案。基于SMPT-1000实验平台进行仿真实验,实验运行结果表明:在保证安全和稳定的前提下,该系统的液位、压强、温度、流量等参数均能符合工艺参数的要求且实现自动控制,系统产品纯度达到75%以上,满足实际生产要求。

PCS/VHPCS复相碳化硅先驱体的制备及性质研究

固态聚碳硅烷和全氢聚碳硅烷是目前研究较多的聚合物碳化硅陶瓷先驱体,在碳化硅陶瓷及其复合材料的制备方面具有广泛应用。制备了由不同比例固态聚碳硅烷(PCS)和乙烯基全氢聚碳硅烷(VHPCS)组成的复相碳化硅陶瓷先驱体,并对先驱体及其裂解产物的理化性质以及结构等进行了研究。研究表明,当PCS引入量低于30 wt.%时,PCS/VHPCS复相先驱体黏度低于200mPa·s;当PCS引入量低于20wt.%时,陶瓷产率可达到80%以上。PCS/VHPCS复相先驱体陶瓷产物为半结晶状β-SiC,晶粒尺寸较小,无明显晶界出现,且元素分布均匀,碳硅比低于PCS衍生陶瓷。

Robust and Tunable Ferroelectricity in Ba/Co Codoped (K_(0.5)Na_(0.5))NbO_(3) Ceramics

The 0.98(K_(0.5)Na_(0.5))NbO_(3)-0.02Ba(Nb_(0.5)Co_(0.5))O_(3-δ) ceramics with doped Ba^(2+) and Co^(2+) ions are fabricated,and the impacts of the thermal process are studied.Compared with the rapidly cooled (RC) sample,the slowly cooled (SC) sample possesses superior dielectric and ferroelectric properties,and an 11 K higher ferroelectricparaelectric phase transition temperature,which can be attributed to the structural characteristics such as the grain size and the degree of anisotropy.Heat treatment can reversibly modulate the content of the oxygen vacancies,and in turn the ferroelectric hysteresis loops of the samples.Finally,robust and tunable ferroelectric property is achieved in SC samples with good structural integrity.

Microstructure Characteristics and Possible Phase Evolution of the Coal Gangue-Steel Slag Ceramics Prepared by the Solid-State Reaction Methods

Industrial wastes such as steel slag and coal gangue etc.were chosen as raw materials for preparing ceramic via the conventional solid-state reaction method.With steel slag and coal gangue mixed in various mass ratios,from 100%steel slag to 100%coal gangue at 10%intervals,microstructure and possible phase evolution of the coal gangue-steel slag ceramics were investigated using X-ray powder diffraction,scanning electron microscopy,mercury intrusion porosimetry and Archimedes boiling method.The experimental results suggest that the phase compositions of the as-prepared ceramics could be altered with the increased amount of coal gangue in the ceramics.The anorthite-diopside eutectic can be formed in the ceramics with the mass ratios of steel slag to coal gangue arranged from 8:2 to 2:8,which was responsible for the melting of the steel slag-coal gangue ceramics at relatively high temperature.Further investigations on the microstructure suggested that the addition of the proper amount of steel slag in ceramic compositions was conducive to the pore formation and further contributed to an increment in porosity.

Low-firing and temperature stability regulation of tri-rutile MgTa_(2)O_(6)microwave dielectric ceramics

A glass frit containing Li_(2)O-MgO-ZnO-B_(2)O_(3)-SiO_(2)component was used to explore the low-temperature sintering behaviors and microwave dielectric characteristics of tri-rutile MgTa_(2)O_(6)ceramics in this study.The good low-firing effects are presented due to the high matching relevance between Li_(2)O-MgO-ZnO-B_(2)O_(3)-SiO_(2)glass and MgTa_(2)O_(6)ceramics.The pure tri-rutile MgTa_(2)O_(6)structure remains unchanged,and high sintering compactness can also be achieved at 1150℃.We found that the Li_(2)O-MgO-ZnO-B_(2)O_(3)-SiO_(2)glass not only greatly improves the low-temperature sintering characteristics of MgTa_(2)O_(6)ceramics but also maintains a high(quality factor(Q)×resonance frequency(f))value while still improving the temperature stability.Typically,great microwave dielectric characteristics when added with 2wt%Li_(2)O-MgO-ZnO-B_(2)O_(3)-SiO_(2)glass can be achieved at 1150℃:dielectric constant,ε_(r)=26.1;Q×f=34267 GHz;temperature coefficient of resonance frequency,τ_(f)=-8.7×10^(-6)/℃.

Clay Materials for Ceramics Application from N’Djamena in the Chad Republic: Mineralogical, Physicochemical and Microstructural Characterization

Herein, we report some characteristics of the clayey materials (CMs) collected from Kaliwa (C1), Kabé (C2) and Malo (C3) district in N’Djamena (Chad). Three samples were characterized applying XRF, XRD, FTIR, SEM. In addition, TGA/DSC were performed to control decomposition/mass loss and show phase transitions respectively of CMs. Geochemical analysis by XRF reveals the following minerals composition: SiO2 (~57% - 66%), Al2O3 (~13% - 15%), Fe2O3 (~6% - 10%), TiO2 (~1% - 2%) were the predominant oxides with a reduced proportion in C1, and (~7%) of fluxing agents (K2O, CaO, Na2O). Negligible and trace of MgO (~1%) and P2O5 was noted. The mineralogical composition by XRD shows that, C1, C2 and C3 display close mineralogy with: Quartz (~50%), feldspar (~20%) as non-clay minerals, whereas clays minerals were mostly kaolinite (~15%), illite (~5%) and smectite (~10%). FTIR analysis exhibits almost seemingly similar absorption bands characteristic of hydroxyls elongation, OH valence vibration of Kaolinite and stretching vibration of some Metal-Oxygen bond. SEM micrographs of the samples exhibit microstructureformed by inter-aggregates particles with porous cavities. TGA/DSCconfirm the existence of quartz (570˚C to 870˚C), carbonates (600˚C - 760˚C), kaolinite (569˚C - 988˚C), illite (566˚C - 966˚C), MgO (410˚C - 720˚C) and smectite (650˚C - 900˚C). The overall characterization indicates that, these clayey soils exhibit good properties for ceramic application.

Study on Acoustic Emission Characteristics of Deformation Damage Process of Zirconia Ceramics

Zirconia ceramics have become increasingly widely used in recent years and are favored by relevant enterprises. From the traditional dental field to aerospace, parts manufacturing has been used, but there is limited research on the deformation and damage process of zirconia ceramics. This article analyzes the acoustic emission characteristics of each stage of ceramic damage from the perspective of acoustic emission, and explores its deformation process characteristics from multiple perspectives such as time domain, frequency, and EWT modal analysis. It is concluded that zirconia ceramics exhibit higher brittleness and acoustic emission strength than alumina ceramics, and when approaching the fracture, it tends to generate lower frequency acoustic emission signals.

组串式PCS故障录波数据传输系统设计

设计了一种组串式PCS故障录波数据传输系统,功率模块能够对故障前后的模拟量数据进行记录,传输并保存到控制模块。还提出了一种双缓冲传输机制,能够有效缩短录波文件传输时间。研究人员可以将录波文件导出到电脑,分析事故原因,提高储能PCS的可靠性和安全性。

基于3D-SIFT与4PCS融合的大数据量点云快速配准方法

测量点云与模型点云的配准是视觉定位的关键。针对测量点云数据量大且与CAD模型点云重叠率低造成视觉定位精度差、算法效率低的问题,提出一种基于三维尺度不变特征变换(3D-SIFT)与4点快速鲁棒匹配算法(4PCS)融合的测量点云与模型点云配准方法。首先利用深度相机对零件进行点云提取并对提取到的测量点云进行降噪和滤波处理;接着利用3D-SIFT特征点提取算法对测量点云和CAD模型点云进行特征点提取;最后把提取的特征点作为4PCS算法的初始值进行2种点云数据的配准。与常用的4PCS算法、Super-4PCS算法相比,在算法仿真与实际应用实验结果表明,本文算法在保证配准精度的前提下将配准速度提高30%以上。

准谐振软开关SiC模块化PCS,为全球绿色能源注入航微力量

6月13日上午,航微能源“全球首创准谐振软开关SiC模块化PCS”发布会于上海SNEC展会现场举行,并于全网直播同步分享。航微能源总工程师韩鹤光主持讲解本次新品搭载的核心技术微能源AEMEMMRA 204特储SPECALSTORAGE微储MRCRO-STORAE端储TERMINALSTORAGE和差异化竞争力,发布会期间吸引了业内专家、储能从业人员及多家行业媒体的关注,现场反响热烈,引发众多讨论交流。

Porous high-entropy rare-earth phosphate(REPO_(4),RE=La,Sm,Eu,Ce,Pr and Gd)ceramics with excellent thermal insulation performance via pore structure tailoring

Thermal insulation materials play an increasingly important role in protecting mechanical parts functioning at high temperatures.In this study,a new porous high-entropy(La_(1/6)Ce_(1/6)Pr_(1/6)Sm_(1/6)Eu_(1/6)Gd_(1/6))PO_(4)(HE(6RE_(1/6))PO_(4))ceramics was prepared by combining the high-entropy method with the pore-forming agent method and the effect of different starch contents(0–60vol%)on this ceramic properties was systematically investigated.The results show that the porous HE(6RE_(1/6))PO_(4)ceramics with 60vol%starch exhibit the lowest thermal conductivity of 0.061 W·m^(-1)·K^(-1)at room temperature and good pore structure stability with a linear shrinkage of approximately1.67%.Moreover,the effect of large regular spherical pores(>10μm)on its thermal insulation performance was discussed,and an optimal thermal conductivity prediction model was screened.The superior properties of the prepared porous HE(6RE_(1/6))PO_(4)ceramics allow them to be promising insulation materials in the future.

基于KDTree改进的Super 4PCS+ICP算法在点云配准中的应用研究

在点云配准过程中,为了提高点云的配准精度,针对ICP算法对于初始位姿的局限性,对点云数据进行Super4PCS+ICP的“先粗后精”处理。首先利用KDTree树搜索对应点,用局部区域的特征度确定特征点集,再使用Super4PCS算法实现粗配准。针对精配准提出KDTree树来加快速度,SVD求解对应点参数、常数为1的加权平均、求解误差函数等手段来实现对ICP算法的改进,并求出刚体变换后的旋转平移矩阵,提高点云配准精度。实验表明,相较于传统ICP算法,本文方法的配准精度有了显著的提升。本文研究的方法可为点云配准的深入研究提供一定的参考。

Effects of ZnO,FeO and Fe_(2)O_(3)on the spinel formation,microstructure and physicochemical properties of augite-based glass ceramics

Augite-based glass ceramics were synthesised using ZnO,FeO,and Fe_(2)O_(3)as additives,and the spinel formation,matrix structure,crystallisation thermodynamics,and physicochemical properties were investigated.The results showed that oxides resulted in numerous preliminary spinels in the glass matrix.FeO,ZnO,and Fe_(2)O_(3)influenced the formation of spinel,while FeO simplified the glass network.FeO and ZnO promoted bulk crystallisation of the parent glass.After adding oxides,the grains of augite phase were refined,and the relative quantities of augite crystal planes were also influenced.All samples displayed good mechanical properties and chemical stability.The 2wt%ZnO-doping sample displayed the maximum flexural strength(170.3 MPa).Chromium leaching amount values of all the samples were less than the national standard(1.5 mg/L),confirming the safety of the materials.In conclusion,an appropriate amount of zinc-containing raw material is beneficial for the preparation of augite-based glass ceramics.

“风光发电+PCS系统”井口绿色在线计量探索

由于油田井场风光发电应用率较低,造成气井、注水井、长停井(温度、压力计量)无低价电源提供电能,无法井口在线计量,只能靠人工现场巡井采集数据;螺杆泵井、电泵井也没有实现,只能采用计量间分离器、储罐量空高和标罐的量油老旧方式计量产量,误差大,费时费力,安全性差。针对上述问题,研制“风光发电+PCS系统”井口绿色在线计量装置,借助胜利油田完善四化建设和风光大力投资东风,建设井场风光互补发电装置为其提供电源。井口流程具备油嘴套、放空设施,为在线测量装置安装和数据传输提供先提条件。与四化建设接轨,利用鲁胜公司安全生产综合管理平台和油气生产运行指挥系统(PCS系统),实现井口绿色在线实时计量采集数据,通过zigbee模块将数据上传至RTU→SCADA服务器→上传至PCS系统,直观显示到屏幕上,进行预警、统计分析,方案优化,形成“风光发电+PCS系统”井口绿色在线计量模式,实现井口绿色在线计量,结合区域生产现状,就近串并联,合理优化管网布设压减管线长度,取消计量站就近汇聚,减少用工和工作量,降低成本,改善工作环境。

Preparation and Thermal Shock Resistance of Mullite Ceramics for High Temperature Solar Thermal Storage

Mullite thermal storage ceramics were prepared by low-cost calcined bauxite and kaolin.The phase composition,microstructure,high temperature resistance and thermophysical properties were characterized by modern testing techniques.The experimental results indicate that sample A3(bauxite/kaolin ratio of 5:5)sintered at 1620℃has the optimum comprehensive properties,with bulk density of 2.83 g·cm^(-3)and bending strength of 155.44 MPa.After 30 thermal shocks(1000℃-room temperature,air cooling),the bending strength of sample A3 increases to 166.15 MPa with an enhancement rate of 6.89%,the corresponding thermal conductivity and specific heat capacity are 3.54 W·(m·K)^(-1)and 1.39 kJ·(kg·K)^(-1)at 800℃,and the thermal storage density is 1096 kJ·kg^(-1)(25-800 mullite ceramics;sintering properties;high-temperature thermal storage;thermal shock resistance).Mullite forms a dense and continuous interlaced network microstructure,which endows the samples high thermal storage density and high bending strength,but the decrease of bauxite/kaolin ratio leads to the decrease of mullite content,which reduces the properties of the samples.

Minimizing Carbon Content with Three-in-One Functionalized Nano Conductive Ceramics:Toward More Practical and Safer S Cathodes of Li-S Cells

Using porous carbon hosts in cathodes of Li-S cells can disperse S actives and offset their poor electrical conductivity.However,such reservoirs would in turn absorb excess electrolyte solvents to S-unfilled regions,causing the electrolyte overconsumption,specific energy decline,and even safety hazards for battery devices.To build better cathodes,we propose to substitute carbons by In-doped SnO_(2)(ITO)nano ceramics that own three-in-one functionalities:1)using conductive ITO enables minimizing the total carbon content to an extremely low mass ratio(~3%)in cathodes,elevating the electrode tap density and averting the electrolyte overuse;2)polar ITO nanoclusters can serve as robust anchors toward Li polysulfide(LiPS)by electrostatic adsorption or chemical bond interactions;3)they offer catalysis centers for liquid–solid phase conversions of S-based actives.Also,such ceramics are intrinsically nonflammable,preventing S cathodes away from thermal runaway or explosion.These merits entail our configured cathodes with high tap density(1.54 g cm^(−3)),less electrolyte usage,good security for flame retardance,and decent Li-storage behaviors.With lean and LiNO_(3)-free electrolyte,packed full cells exhibit excellent redox kinetics,suppressed LiPS shuttling,and excellent cyclability.This may trigger great research enthusiasm in rational design of low-carbon and safer S cathodes.

核电厂PCS热交换器的选型设计及工程应用

三代百万千瓦级压水堆核电厂非能动安全壳热量导出系统(PCS)非能动热交换器作为全新设计,研究其设备功能、换热功率和空间布置等要求,针对不同型式换热器优缺点对比,开展PCS热交换器选型分析。开展传热计算和数值模拟分析,确定热交换器关键参数要求及关键部件设计方案。针对实际工程应用需求,开展PCS热交换器整体结构设计研究,确定设计方案。

装配式建筑PC构件产销一体化管理系统研究

混凝土预制(Precast Concrete,PC)构件是装配式建筑主体结构的基础,提升其生产的智能化、信息化水平尤为关键。文章以PC构件厂的生产管理模式和普遍管理现状为研究对象,基于PC构件生产线模式的需求分析,设计管理系统的基本组成架构、静态和动态信息模块,完成管理系统的开发。通过订单跟踪和生产管理在管理系统中的集成,完成PC构件的多品种、小批量生产的一体化管理;并基于数字孪生模型与PC构件生产设备之间的信息交互,实现订单跟踪的可视化管理。结果表明:管理系统通过对PC构件的订单跟踪和质量管理,可实现订单数据的全面分析和精细化管理,并有效提升生产效率和决策管理水平。

基于PCS7的LM5000 STIG燃机发电机组监控系统设计

针对某燃气轮机调峰电厂LM5000 STIG蒸汽回注式燃气轮机发电机组监控系统设备老化现状,提出了一种基于西门子PCS7的监控系统升级改造方案,介绍了系统的网络架构、硬件配置和控制软件设计方法,详细分析了燃机启动供油数据的实测方法以及发电机组从启动、慢车到并网发电全过程的燃油控制策略。实际运行结果表明,系统技术先进、性能稳定、维护方便,取得了良好的改造效果,可为今后使用标准工业软硬件进行燃气轮机控制提供一定的借鉴。

Physic, Chemical and Mineralogical Characterizations of Clays Used in the Making of Traditional Ceramics in the City of Katiola, C ôte d’Ivoire

In C ?te d’Ivoire, traditional ceramics are widely used in the form of pottery. The latter is used to store food, water and cereals. Analyzes (X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), inductive plasma optical emission spectrometry (ICP-OES), scanning electron microscopy (SEM) and analysis thermal gravimetric (ATG)) were carried out to determine the morphology, the chemical, physical and pedological constituents of these raw materials. It appears from this study that the clays used in the Mangoro pottery of Katiola contain silica SiO2, alumina Al2O3 and iron oxide Fe2O3 as well as kaolinite, muscovite, smectite and quartz.