回转窑托轮轴瓦温度过高原因分析及处理

1托轮的调整托轮的安装找正,是以由经纬仪在底座上打出的回转窑的中心线为基准进行的,找正时,要求同一侧三档托轮中心线在竖直平面内的直线度偏差不大于0.5mm;每档托轮的标高偏差不大于0.5mm。     

回转窑空载试车中的托轮调整

2002年12月我参加了河南省某水泥厂新型干法水泥窑技改工程的烧成系统设备调试工作。该窑为Φ3.6×74m干法带余热发电锅炉回转窑,四档支承,信号挡轮安装在第三档,传动装置安装在第三、四档之间靠近第三档。由于设备安装划线、打点混乱,偏差较大,且一、二、四档托轮空载试车时歪斜调整错误,使回转窑系统调试运转很不顺利,故重新进行了托轮调整。     

回转窑托轮发热的处理

我厂现有７００t／d和１０００t／d两条干法生产线，回转窑规格分别为３m×４８m，３．２m×４６m带五级低压损旋风预热器，三档托轮。因托轮发热，造成停料、停窑。托轮发热的处理方法：（１）针对托轮瓦的刮研问题，从１９９９年刮瓦时采用天津水泥设计院提出的２０°～３０°小接触角刮瓦法，实践证明完全可以满足生产需要。（２）窑的中心线不直，针对这个问题，１９９９年底我们对窑的直线度进行校正。在一档轮带与三档轮带最高点处各竖一标尺，并在标尺同一高度拉一细铁丝，然后测量中档轮带最高点到铁丝的距离，再调整中档托轮的…     

用激光测定回转窑中心线

水泥回转窑中心线的准直是保证回转窑长期运转的一个关键。但是由于窑体长、支点多,要保持中心线的准直却比较困难。造成窑体中心线不直的原因很多。在安装或调整时,托轮位置不正确,各筒体段节的接口没有对正,正确安装的回转窑,由于在使用中,滚圈、托轮的不均匀磨损,基础     

逆向调整消除托轮振动的方法

0 引言 我公司Φ3 5m×145m湿法回转窑设有6组托轮,随着使用时间的增加,托轮不均匀磨损、摩擦系数、窑内热工制度、天气、基础沉降等因素,都会不同程度的改变托轮负荷,引起托轮面与轮带摩擦力的改变,造成窑体中心线偏移.故往往根据不同的情况变化,适当调整托轮(一般采用正向调整法),使托轮与轮带的接触面≥75%,尽力保持托轮中心线与窑体中心线平行,使托轮的承受负荷均衡,轮带与托轮均匀磨损,从而保证回转窑的安全运转.但有时正向调整并不能解决托轮故障,以下介绍采用逆向调整消除托轮振动的方法.     

回转窑筒体跳动中心的检测及简易计算方法

回转窑在安装中,筒体各段节中心线应保持在同一直线。当窑运转一段时间后,由于托轮混凝土基础不均匀沉降,托轮调整不正确,支承零件（轮带、托轮、筒体垫板、轴瓦）磨损不一致,以及检修更换托轮和轴瓦时,没有考虑其新旧尺寸变化等原因,造成窑中心线变动,容易引起工艺和设备事故。本文针对水泥厂回转窑中心线的找正策略,分析了水泥厂一直沿用的检测完窑筒体外圆的跳动后通过作图法来估算中心线偏移量的弊端（费时费力,误差大）,通过建立一套简易的数学模型,快速准确地计算出回转中心线的偏移量,将其计算结果与史密斯公司计算出的回转中心线偏移量理论数值进行对比,认为该模型是可行的。     

我厂回转窑支承装置的检修

山东东华水泥有限公司2500t／d生产线回转窑多次出现烧瓦、翻瓦事故，对此重点进行了托轮组检修，窑中心线、开式齿轮传动装置检测。对于托轮组，刮研打磨托轮轴和托轮瓦以及球面瓦直至达到图纸要求；分别在水平和垂直方向检测窑中心线。结果显示，窑中心线误差在1．5mm范围内，齿轮传动装置各测量结果在规定的范围内，均符合安装标准。     

回转窑托轮表面裂纹的现场处理

我公司2000 t/d新型干法水泥生产线,回转窑规格为φ3.95 n1×56 m,配有三档托轮和液压挡轮。     

回转窑动态检测及托轮磨削的应用

我公司3#回转窑Φ4.8 m×74 m，三档支撑，带液压挡轮，斜度4％，设计产量5?000~6?000 t/d。回转窑运行过程中，筒体存在晃动现象，在窑尾密封处观察较为明显，晃动幅度约±20 mm，甚至导致三档托轮基础及周围栏杆也随之晃动。     

b值分析法在回转窑托轮中心线检测和调试中的应用

ｂ值分析法在回转窑托轮中心线检测和调试中的应用王志鹏内蒙古蒙西水泥有限公司（０１６０１６）ｂ值分析法是从回转窑托轮轴线检测和调试中总结出来，又应用于回转窑托轮中心线检测和调试的一种直观准确的方法。这种方法借助于铅丝法进行检测和调试水平投影面内托轮轴线...     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US

In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.     

Novel polyurethane coating technology through glycidyl carbamate chemistry

Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.