磨机二仓锥形分级衬板的改进

<正>锥形分级衬板是φ3.8m×13m、φ4.2m×13m等许多水泥磨的常用型式。锥形分级衬板一般以磨机轴向相邻的两排作为一个组合,在通过磨机筒体中心线的轴向截面上,每个组合的衬板表面截面线与磨机筒体母线形成一定的角度。这种衬板过去在欧美国家多用于二仓,因为其水泥磨基本是两仓闭路磨,二仓研磨体的球径相差大,级数多(五级球配),希望通过分级衬板对钢球实现分级,使大球集中于进料端有利于粗磨,而小球集中于出料端有利于细磨,以此提高闭路磨系统的粉磨效率。但对于开流高细磨而言,其基本工艺是以开流为主,研磨体球径也比常规     

提高钢球磨煤机衬板使用寿命的对策

低速钢球磨煤机虽然有占地面积大、笨重、系统复杂、噪声大、耗电高、初投资高等缺点 ,但对煤种的适用性广 ,能在煤中混有铁块等杂物时长时间可靠地运行 ,维持一定的出力和煤粉细度 ,且单台出力高 ,检修周期长。所以大多数火力发电厂至今仍在使用。磨煤机运行时 ,钢球在磨制煤粉的同时 ,对筒体的衬板也存在冲击和磨损。因此普遍存在衬板磨损问题 ,其情况与煤质、衬板和钢球材质、硬度及安装运行工况等因素有关。如我公司热电厂的 5台钢球磨煤机中 ,1 #和 5 #磨换衬板后仅用 8个月就出现衬板断裂、磨漏和脱落等问题。其他磨煤机也有类同问题…     

磨机筒体衬板磨损浅析

磨机筒体衬板作为易磨件,不仅保护简体不被磨损,重要的是向研磨体传递动能而对磨机作业效率产生影响。因而关注筒体衬板的磨损非常必要。本文即根据多年现场观察,就水泥磨筒体衬板的磨损情况进行简要分析。     

Φ3.8×7.0+2.5m煤磨改造体会

对5000t/d窑配套的风扫煤磨机进行了减球、更换球及衬板、合并粉磨仓、去除挡料圈,加大入磨风机能力以提高热风风量,前移篦冷机热风取风口以提高入磨风温,将原Φ1.5m转子带反击锥选粉机更换为Φ2.4m转子低阻力动态选粉机,使煤磨系统电耗、煤粉水分有了较大改善。     

4—72—11No12C风机壳的改装

我公司于１９８７年１２月１８日投产以来，Φ２．２m×１３m湿法段球磨机筒体磨损严重，原筒体厚度２５mm，用Q２３５钢卷制而成，但是仅工作６３８５８h，Ⅰ、Ⅱ仓筒体被刷磨得很薄，还有１０～１５mm的凹沟，经过检测仪测得厚度只有４～５mm，２／３的筒体报废。原筒体断面结构如图１所示。图１改进前磨机筒体断面结构在生产紧张的情况下，我公司采取补救措施。拆除衬板，把衬板下的填料巴金垫改为耐磨耐冲刷的胶带，并在空隙处间加入混凝土填实，再安装衬板。衬板镶砌完毕后，用不同厚度的铁板卷成条把衬板与衬板间的缝逐一卡死，并焊…     

TiraxΦ2.8 m×4 m+2.4 m全风扫煤磨正常生产的措施及操作调节要领

我厂2000t/d熟料新型干法生产线的煤粉制备采用FLS公司设计的TiraxΦ2.8m×4m 2.4m全风扫煤磨,传动电机功率330kW,与同规格产品的旧设计相比,粉磨仓由二仓改为一仓加分级衬板,粗粉由回入磨尾改为返回磨头,装球量由26.4t上升至27t,设计能力17.5t/h,煤粉细度<15％(0.09mm筛余),煤粉水分2％左右。1988年8月试产至1990底,由于受多种不良因素的影响,煤磨     

MBS2736棒磨机筒体衬板技术改造

分析云南云天化股份有限公司三环分公司磨矿厂MBS2736棒磨机筒体泄漏的原因,通过对棒磨机筒体衬板进行技术改造,解决了筒体泄漏问题,提高了棒磨机的运行率,延长了设备使用寿命,为磷酸装置的生产提供了有力的保障。     

MBS2736棒磨机简体衬板技术改造

分析云南云天化股份有限公司三环分公司磨矿厂MBS2736棒磨机筒体泄漏的原因,通过对棒磨机筒体衬板进行技术改造,解决了筒体泄漏问题,提高了棒磨机的运行率,延长了设备使用寿命,为磷酸装置的生产提供了有力的保障.     

球磨机衬板材质机械性能的选择

提高球磨机的运转率是水泥生产者所关注的问题,其关键是提高磨机衬板和研磨体的使用寿命。本文将对磨机衬板的受力进行分析并阐明其对材质机械性能的要求。供同志们参考。一、球磨机衬板的受力分析根据球磨机的工作原理,研磨体在磨筒体内,由于磨筒体以32/((D_1)~(1/2))转/分的转速旋转运     

φ2.4m×13m水泥磨阶梯衬板的改进

我厂两台φ2.4m×13m水泥磨,自投产以来一、二仓一直使用阶梯衬板,经常发生螺栓松动、断裂、掉衬板等现象。特别是磨机筒体螺栓孔大部分已磨成椭圆状,漏灰严重、造成频繁停磨,影响生产。通过大量调研考察,决定改用少螺栓镶砌阶梯衬板,在磨机一仓进行试验,取得了良好的效果。1 原因分析 磨机一、二仓阶梯衬板结构和安装见图1。因为锰钢铸造件允许一定量     

乙烯酮(双乙烯酮)下游产品废水的治理技术

乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。     

A study of miscibility of blends of polybutadienes of varying microstructure

The miscibility of various amorphous polybutadienes with mixed microstructures of 1,4 addition units (cis, 1,4 and trans 1,4) and 1,2 addition units have been investigated. The studies here involved optical transparency, differential scanning calorimetry, and small angle light scattering. It was found that a 90 percent (cis) 1, 4 addition polybutadiene was immiscible with high (91 percent) 1,2 addition polybutadiene. Reduction of the 1,2 content to 71 percent induced an upper critical solution temperature (UCST) with the cis 1,4 polymer. Polybutadienes with 50 percent and 10 percent 1,2 contents were miscible above the crystalline melting temperature of the cis 1,4 polybutadiene. Immiscibility of the 91 percent 1,2 addition polymer was also found with a 10 percent 1,2 polybutadiene. The latter polymer also exhibits an UCST with the 71 percent 1,2 polymer. The results are used to interpret the characteristics of blends of polybutadienes of varying microstructure.     

几种乙炔加压设备性能的比较

阐述并比较了几种加压设备在乙炔加压清净过程中的性能和特点。     

粉煤灰中烧失量检测的不确定度分析

以F类粉煤灰为例,详细介绍了测定粉煤灰中烧失量的步骤、计算数学模型、影响测量不确定度的因素以及各项测量不确定度分量评定,人员、设备、材料、方法、环境都是影响测量不确定的因素。     

生物油的成分分析及物性测定

以添加FeCl2的ZnCl2-KCl混合熔盐裂解纤维素和秸秆,制得生物油。采用傅立叶变换红外光谱法和气相色谱-质谱法分析生物油的成分。结果表明,生物油中成分复杂,含有氧元素、多种有机化合物,主要包括酮类、醛类、酚类及羧酸类等。测定了20～80℃生物油的密度和粘度,发现生物油的密度与温度呈较好线性关系,而生物油的粘度均大于水的粘度,且不同熔盐体系对秸秆生物油的粘度无较大影响。     

Effect of degree of deacetylation of chitosan on the kinetics of ultrasonic degradation of chitosan

The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003     

分解炉扩径的技术改造

我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉     

Process of acceleration of filtration of viscose

Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969.