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。     

垫板调整对窑中心线的影响

本文主要分析回转窑在长周期运转后中心线产生偏差,针对托轮表面存在大量凹坑和裂纹,常规进行托轮调整风险大的情况,提出新的调整办法,介绍笔者团队利用垫板调整的方法对窑中心线进行调整的案例,为回转窑技术人员提供参考建议。     

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.     

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.     

Methyl 2,4,6-decatrienoates Attract Stink Bugs and Tachinid Parasitoids

Halyomorpha halys (Stål) (Pentatomidae), called the brown marmorated stink bug (BMSB), is a newly invasive species in the eastern USA that is rapidly spreading from the original point of establishment in Allentown, PA. In its native range, the BMSB is reportedly attracted to methyl (E,E,Z)-2,4,6-decatrienoate, the male-produced pheromone of another pentatomid common in eastern Asia, Plautia stali Scott. In North America, Thyanta spp. are the only pentatomids known to produce methyl 2,4,6-decatrienoate [the (E,Z,Z)-isomer] as part of their pheromones. Methyl 2,4,6-decatrienoates were field-tested in Maryland to monitor the spread of the BMSB and to explore the possibility that Thyanta spp. are an alternate host for parasitic tachinid flies that use stink bug pheromones as host-finding kairomones. Here we report the first captures of adult and nymph BMSBs in traps baited with methyl (E,E,Z)-2,4,6-decatrienoate in central Maryland and present data verifying that the tachinid, Euclytia flava (Townsend), exploits methyl (E,Z,Z)-2,4,6-decatrienoate as a kairomone. We also report the unexpected finding that various isomers of methyl 2,4,6-decatrienoate attract Acrosternum hilare (Say), although this bug apparently does not produce methyl decatrienoates. Other stink bugs and tachinids native to North America were also attracted to methyl 2,4,6-decatrienoates. These data indicate there are Heteroptera in North America in addition to Thyanta spp. that probably use methyl 2,4,6-decatrienoates as pheromones. The evidence that some pentatomids exploit the pheromones of other true bugs as kairomones to find food or to congregate as a passive defense against tachinid parasitism is discussed.     

2007～2008年世界塑料工业进展

收集了2007年7月～2008年6月世界塑料工业的相关资料,介绍了2007～2008年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况.按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯·硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、不饱和聚酯树脂、环氧树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍.     

2005～2006年国外塑料工业进展

收集了2005年7月～2006年6月国外塑料工业的相关资料,介绍了2005—2006年国外塑料工业的发展情况。提供了世界塑料产量、消费量及全球各类树脂生产量以及各国塑料制品的进出口情况。作为对比,介绍了中国塑料的生产情况。按通用热塑性树脂（聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂）、工程塑料（聚酰胺、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚）、通用热固性树脂（酚醛、聚氨酯、不饱和树脂、环氧树脂）、特种工程塑料（聚苯硫醚、液晶聚合物、聚醚醚酮）的品种顺序,对树脂的产量、消费量、供需状况及合成工艺、产品开发、树脂品种的延伸及应用的扩展作了详细的介绍。