烟气制酸净化工序气相温度升高的成因和对策

硫铁矿制酸和冶炼烟气制酸的净化工序通常采用一级动力波洗涤器—填料塔—二级动力波洗涤器—两级电除雾器的工艺流程,一级动力波洗涤器出口烟气温度超高不仅影响玻璃钢设备的使用寿命,更有可能导致硫酸系统SO_2风机的紧急停车。分析了净化烟气温度超高的主要原因,并提出了优化解决方案。     

WSA制酸系统在株冶的应用及改进

介绍了WSA铅冶炼烟气制酸系统工艺流程、主要设备规格及其生产情况.鉴于高含尘铅冶炼烟气直接进入一级动力波洗涤器,改用高效斜板斜管沉降器处理一级动力波洗涤器循环液,强化液固分离效果;对动力波洗涤器捕沫器进行强化,增加洗涤器,提高捕沫效率;改进电除雾器的气体分布及采用实时增湿烟气,从而改善净化效果.此外,还采取了一些改进措施,如:熔盐换热器重新施焊,更换烟气预热器玻璃管,氮气保护熔盐等,保证WSA制酸系统稳定运行.     

动力波洗涤器在烟气脱硫中的应用

评述了动力波洗涤技术的应用现状.对其在复合肥生产系统的尾气净化工艺、冶金烟气制酸系统的尾气净化工艺和中化云龙集团中处理90 t/h的锅炉尾气中二氧化硫气体的净化工艺等典型代表技术的发展进行分析.结合动力波洗涤器的脱硫原理和设备特性提出未来动力波洗涤器技术的发展方向.理论分析和已有研究表明,运用动力波洗涤器技术脱除工业锅炉尾气,其烟气处理量范围广,稳定性高,脱硫效率高;且可有效解决磷矿浆堵塞等问题.     

CN过滤器在净化污酸处理中的应用实践

我厂270 kt/a铜转炉烟气制酸装置（即硫酸四系列）净化工序采用一级动力波洗涤器—气体冷却塔—二级动力波洗涤器—2级电除雾器稀酸洗净化工艺。     

WSA制酸系统在株冶的应用及改进

介绍了WSA铅冶炼烟气制酸系统工艺流程、主要设备规格及其生产情况。鉴于高含尘铅冶炼烟气直接进入一级动力波洗涤器，改用高效斜板斜管沉降器处理一级动力波洗涤器循环液，强化液固分离效果；对动力波洗涤器捕沫器进行强化，增加洗涤器，提高捕沫效率；改进电除雾器的气体分布及采用实时增湿烟气，从而改善净化效果。此外，还采取了一些改进措施，如：熔盐换热器重新施焊，更换烟气预热器玻璃管，氮气保护熔盐等，保证WSA制酸系统稳定运行。     

冶炼烟气制酸动力波洗涤器废酸浓度表征方法探析

某大型"双闪"铜冶炼厂冶炼烟气SO_3发生率不规律变化,导致制酸系统净化工序一级动力波洗涤器废酸浓度不规律波动,生产调整被动局面时有出现,给全厂满负荷稳定生产带来挑战。通过大量目标数据分析和生产实践验证,找到了一级动力波洗涤器循环泵电流和出口烟气温度变化作为一级动力波洗涤器废酸浓度快速表征的方法,为岗位预见性操作和生产调整提供了直观依据。     

铅冶炼烟气制酸一级高效洗涤器的改造实践

湖南水口山有色金属集团有限公司(以下简称水口山有色)100kt/a铅冶炼烟气制酸装置于2005年8月建成投产。铅冶炼采用氧气底吹炉熔炼-鼓风炉还原工艺,铅冶炼烟气净化采用一级高效洗涤器—冷却塔—二级高效洗涤器—两级电除雾器稀酸洗净化工艺。一级高效洗涤器是净化工序降温除尘最重要的一台设备,其运行好坏直接关系到净化效果的优劣,由于一级高效洗涤器直接与高温含尘烟气接触,因此容易发生堵塞和烧损事故。     

关于硫酸净化一级洗涤器逆喷管的使用探讨

大冶有色冶炼厂硫酸三系列和四系列利用奥斯麦特炉和转炉混合烟气制酸,净化工序一级洗涤器均为逆喷式洗涤器。温度为280℃的烟气从顶部进入一级洗涤器逆喷管,在逆喷管内与向上喷射的循环稀硫酸逆流接触、激烈碰撞,进行净化除尘。逆喷管顶部堰口处溢流出稀硫酸沿逆喷管内壁向下流动形成液     

贵溪冶炼厂硫酸二系统概述

介绍了贵溪冶厂新建的炼铜烟气制酸系统的工艺落，主要设备及工艺参数，净化工序采用了二级动力波洗涤器，转化工序采用ⅢⅠ－ⅣⅡ、“３＋１”两转两吸流程。     

锌冶炼烟气稀酸洗净化工艺的实践与认识

在冶炼烟气制酸中,选择适当的净化流程,对保证制酸系统稳定运转至关重要。本文就两家锌品厂锌冶炼烟气稀酸洗净化流程的实践作一些粗浅的讨论。1.流程简述工艺流程简图见图1。由旋风除尘器来的350℃左右的高温烟气,经电除尘器(LD101型)除去大部分粉尘。排出的含尘约0.2g/m~3(标准)的烟气,在冲击洗涤器中与循环稀酸接触,除去尘和其它有害杂质,同时进行绝热蒸发冷却,从冲击洗涤器排出的含尘循环稀酸,经斜板沉降器分     

Sapindaceae,cyanolipids, and bugs

Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.     

2008～2009年世界塑料工业进展

收集了2008年7月～2009年6月世界塑料工业的相关资料,介绍了2008～2009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、环氧树脂、不饱和聚酯树脂)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。     

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.     

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.     

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.