新型炭素制品焙烧炉

1.前言电炉用电极、电解铝用阳极、高炉用炭块等典型的大型炭素制品制造过程中的热处理工艺,大致可分为一次焙烧,浸渍沥青后的二次焙烧和石墨化。其中,为改善炭素制品质量而开发的二次焙烧是近十年制造工艺方面新增加的技术。一般来说,炭素制品成型常采用煤焦油沥青作粘结剂。因此,在一次焙烧中,压型品的     

西玛通 隆重推广炭素焙烧 鲁棒多变量预估优化控制系统

<正>Robust Multi-Variable Predicted Optimize Control System for Baking of Carbon北京西玛通(CMT)西玛高科(CMTEK)炭素焙烧专用产品:炭素焙烧鲁棒多变量预估优化控制系统Robust Multi-Variable Predicted Optimize Control System for Baking of Carbon北京西玛通(CMT)西玛高科(CMTEK)工程服务内容:1、承揽行业:石化、冶金(铝业)、炭素DCS和PLC自动化工程。2、业务范围:炭素焙烧重油、天然气、冷煤气燃烧器、电磁阀、电动(气动)调节阀、燃料快速接头、减压阀、过滤器等;燃烧架,测温测压架,排烟架(排烟机),冷却架,鼓风架等。炭素焙烧控制效果案例:1.采用预估控制方法和常规控制方法曲线效果比较采用预估方法使控制曲线平稳,相对于常规控制燃料原则节省15%左右。目标曲线符合率高。温度误差减少。产品合格率高。去掉人为因素的干扰,产品质量稳定。     

焙烧过程中炭素制品的受热状态分析

焙烧是炭素制品生产中的一个重要工序,其对炭素制品质量有很大影响。而炭素制品在焙烧炉中的受热过程是比较复杂的。因此,分析炭素制品在焙烧过程中的受热情况,对寻求合理的焙烧制度,提高制品焙烧成品率,有非常重要的意义。     

车底式炉焙烧

焙烧是炭素制品生坯在填充料保护下、装入专门设计的加热炉内进行高温热处理，使生坯中的煤沥青炭化的工艺过程。焙烧是炭素制品生产的主要工序之一，焙烧生产周期较长，而且能耗较高，生坯焙烧的质量对成品质量和后工序的成品率都有一定影响。20世纪90年代世界各国炭素企业使用的焙烧炉有：环式焙烧炉、隧道窑、倒焰窑、车底式焙烧炉、回转床式焙烧炉、单室炉等多种。     

文摘

阳极焙烧炉重油温度智能变参数PID控制系统；炭素焙烧炉合理热工制度的制定；三期焙烧BPS系统的工艺优化；我国炭电极发展方向与措施；聚丙烯腈基碳纤维抗拉强度的影响因素……     

炭素工业焙烧炉烟气污染 治理技术的研究和应用

焙烧是炭素制品生产过程的重要工序,焙烧炉烟气是炭素工业大气污染治理的重点,其排放的烟气量大,污染物浓度高。针对炭素焙烧产生的烟气特性和烟气多污染物深度净化、超低排放的技术要求,开发出了国内第一套炭素行业焙烧炉烟气脱硫、脱硝和湿法电除尘装置,取得了良好的净化效果,实现了炭素工业焙烧烟气的超低排放。     

用超声波方法鉴定炭素制品的浸渍质量

炭素材料的密度对制品的物理化学性质有重要的影响。工艺过程规定用沥青浸渍焙烧制品。由于浸渍罐中温度、压力、沥青粘度以及炭素材料气孔构造的变化,常可导致制品中出现沥青饱和程度不均的现象。从而使得浸渍后焙烧材料的密度,在单个制品和整批制品平均值上出现差异。在文献中,介绍了根据低频超声波振动在电极制品中的扩散速度鉴定制品密度的可能性。     

液体加压浸渍初探

1.前言在炭素生产中,浸渍是改善炭素制品性能的重要手段。其主要工艺过程是对焙烧半成品进行抽真空、加压,使浸渍介质煤沥青最大限度地进入产品内部,经再次焙烧、石墨化,提高产品的密度、强度、导电、抗氧化等性能。经多年来理论和实践证明,在影响浸渍效果的诸因素中,浸渍的压力条件(加压方法、压力值及其维持时间)尤为重要。     

二次焙烧设备选型探讨

为适应炭素工业向高水平发展的需要，对电极和其他炭素产品质量提出更高的要求，从而采用了高压浸渍和二次焙烧技术，它是有效提高产品质量的重要途径之一。目前各炭素企业的二次焙烧产量逐年增加，而普遍存在二次焙烧设备不足的现象，都想扩建和新建。但建什么型式的二次焙烧设备，能够又快，又好，又省成为亟待解决的问题。本文重点介绍了这方面的问题供各炭素企业参考。     

大规格炭电极的焙烧控制系统应用研究

焙烧是炭素制品生产中的一个关键工艺.在焙烧炉加热过程中,利用焙烧炉燃烧装置及控制系统对炉温进行控制,以生产出优良的电极产品,同时降低能耗.自2011年6月份以来,河北顺天电极有限公司与北京华邦天控科技发展有限公司合作开发大规格炭电极的焙烧控制系统,结合车间的生产实际,从车间工艺曲线出发,通过不断摸索制定相应措施.在不断完善过程中,满足了焙烧工艺要求,达到了节能降耗的目的.     

氢气纯度分析方法准确性的探讨

ONACCURACYOFANALYSISOFOFHYDROGEN1前言我公司目前应用的氢气纯度分析方法有两种,一种是爆炸反应法,另一种是焦性没食子酸吸收法。几年来,人们对两种分析方法的准确性曾有过褒贬不一的评论。这里我们也谈谈自己粗浅的观点。2爆炸法测定氢气纯度一定量的氢气样品与适量的空气之均匀混合物因反应后生成液体水而引起气体体积减少,减少的体积等于参加反应气体体积之和。其中l／3为氧气,2／3为氢气。根据氢气取样量和反应前后混气体体积之差,以及氢气在反应中的体积比例关系,可计算出样品的氢气纯度。计算公式式中：A一混…     

COMPARISON OF METHODS OF ANALYSIS OF GYPSUM1

The different analytical methods proposed for the evaluation of gypsum have been subjected to an experimental test. A combination method, consisting of a fusion with KHCO₃ and determination of CaO by KMnO₄ titration, the SO₃ by Andrews method of titration of BaCrO₄ has been found to give very reliable results with the least consumption of time.     

茶多酚提取方法进展

本文综述了国内外现有茶多酚提取方法的现状以及近期的研究进展，并对其优缺点进行了评价。这将有助于中低档茶的综合利用和茶多酚的进一步开发应用。     

SEDIMENTATION OF BINARY MIXTURES OF PARTICLES OF UNEQUAL DENSITIES AND OF DIFFERENT SIZES

A model is developed for the sedimentation from a suspension of two particle species of unequal densities and of different sizes. The composition and the thickness of various layers in the sediments are predicted using graphical and analytical methods. The model predictions were in excellent agreement with experimental results, when the particle size ratio was ≥ 108. When size ratio of the particles was 2.60 and 4.31 the agreement occurred in about 50 percent of the cases.     

HEASUREHENT OF INSTANTANEOUS RATES OF LOSS OF VOIATILE COMPOUNDS DURING DRYING OF DROPS

A novel technique serves to monitor instantaneous rates of loss of a volatile solute from a suspended drop during drying. A highly sensitive electron capture detector is used to monitor concentrations of SF6 released into a flowing gas stream from a suspended, drying drop. Simultaneously, the appearance and morphological development of the drop are monitored with a video camera. This provides the wherewithal of relating instantaneous rates of loss of the volatile solute to particular events during the development of particle morphology.

Initial experiments have been carried out with drops of aqueous solutions of glucose, sucrose, maltodextrin and coffee extract. The results clearly display the onset of the volatiles-retentive selective diffusion phenomenon. There is also substantial loss of the volatile component later in the drying process, when the drops undergo repeated ex ansion, bursting and cratering due to the formation of internaf bubbles. These experiments appear to be the first quantitative demonstration of major losses accompanying changes in drop morphology.     

ANALYSIS OF RECENT MEASUREMENTS OF THE VISCOSITY OF GLASSES

Viscosity of Simple Soda-Silicate 500° to 1400°C Comparison of the results given by English with those of Washburn, Shelton and Libman, indicates a discrepancy in the absolute values of log₁₀ viscosity amounting to 0.6, those of Washburn et al., being relatively too high. If correction for this is made, the isothermal curves of log₁₀ viscosity as a function of soda content are smooth up to 50% Na₂O, showing no inflection. The observations as a function of temperature T are all represented within accidental error by an equation of the type where all three constants vary regularly with the composition. Change of Viscosity of Glass (6SiO₂, 2Na₂O) due to Molecular Substitution of CaO, MgO and Al₂O₃ for Na₂O The effect is clearly brought out by plotting (from the results of English) the change of log₁₀η due to the substitution as a function of temperature. The curves each show a sharp bend at a temperature between 840° and 1050°C, which is designated the aggregation temperature T_a. If we divide these curves by the corresponding percentage substituted, we get curves for each oxide which are straight and parallel below the aggregation temperatures, the slopes (increase of change of log₁₀η per 100°C) being −0.056 (CaO), −0.055 (MgO), −0.018 (A1₂O₃) per per cent oxide substituted. For substitution of 1/2 molecule the slopes are −0.325 (CaO), −0.23 (MgO) and −0.18 (Al₂O₃) per 100°. At the aggregation temperature the change of log₁₀η per per cent is a minimum, 0.03 to 0.06 for CaO, 0.12 for MgO, 0.07 for Al₂O₃. Evidence of Aggregation in Glasses, from viscosity Measurements The sharp bends in the plots of change of log₁₀η due to substitution of an oxide for Na₂O, suggest the beginning of molecular aggregation at these temperatures. These aggregation temperatures are close to the devitrification temperatures, but the effect on the viscosity curves cannot be due to actual devitrification since it does not change with time. Taking the aggregation temperatures as equal to devitrification temperatures, additional isotherms are roughly sketched into the equilibrium triangle of the system Na₂O-CaO-SiO₂. Change of Viscosity of Glass (4SiO₂, 2Na₂O) due to of Substitution of B₂O₃ for SiO₂ The change of log₁₀η (from the results of English) is plotted as a function of temperature, and also the change of log₁₀η per per cent B₂O₃. The curves are more complex than for the substitution for Na₂O.     

环氧树脂羟基值测定方法的研究

利用乙酸酐、吡啶和浓硫酸混合的乙酰化试剂测定环氧树脂中羟基值含量的方法具有操作简便、滴定终点明显和分析结果误差小等优点。     

骑式摩托车油箱喷涂工艺的改进

面对日益激烈的市场竞争,摩托车油箱外观质量越来越成为影响销售的因素之一。文章介绍了改进工艺后的油箱涂装,该涂装体系提高了油箱外观的丰满度,降低了油箱涂装的生产成本。     

几种针状焦性能对比

针状焦分石油系和煤系两大类,这主要取决于针状焦的原料来源。在同一系列中由于原料不同和工艺条件不同 ,针状焦的各自性能也不相同。针状焦是生产超高功率石墨电极和高功率石墨电极的主要原料 ,针状焦的性能对石墨电极的质量有至关重要的影响。所以对针状焦性能以及其对石墨电极质量影响的研究十分必要的。以下是常用的几种进口针状焦和国产针状焦的性能对比。１原料性能分析对比原料试样包括４种针状焦 ,其中两种为进口针状焦：三菱针状焦和新日化针状焦;另两种为国产针状焦：鞍山针状焦和锦州针状焦。其中除锦州针状焦是石油系针状焦外…     

用两个形状指数表征粉煤灰颗粒形貌的研究

引用两个形状指数表征颗粒形状的概念,即先将颗粒形状近似为椭圆,再将椭圆图像分离:以圆为基准的颗粒宏观形状指数δ;以光滑椭圆为基准的颗粒轮廓凹凸度,即微观形状指数ζ。分析和发展了近似椭圆模型。并运用图像分析仪对粉煤灰、水泥样品进行实验。结果表明,粉煤灰颗粒的两个形状指数δ和ζ都大于水泥颗粒。证明粉煤灰颗粒的球形度、表面光滑度优于水泥,而且,随着粒径增大,δ和ζ呈下降趋势,表明磨制颗粒越粗。(?)粒形状越不规则。文中还运用近似椭圆模型再现了颗粒的模拟图像。