KK&K和AC SO2风机在烟气制酸系统的应用

介绍了德国KK&K风机和美国AC风机在金隆公司烟气制酸系统的应用情况,详细介绍了SO2风机的变频、转子及润滑油等系统。针对运行中出现的问题,技术人员对风机进行了维修和改造,以确保风机安全稳定运行。对国内冶炼烟气制酸SO2风机的选择、设计及设备故障的处理均有一定借鉴作用。     

祥光铜业高浓度SO2烟气制酸技术的改进与发展

介绍了阳谷祥光铜业有限公司期工程1000 kt/4硫酸装置工艺流程和设备配置情况。在一期工程高浓度SO2烟气转化技术成功运行的基础上,通过改进干吸串酸方式和转化器进口分布风、转化工序设置火管废热锅炉等措施,进一步提升了制酸装置的技术水平。除SO2风机和高温循环风机外,该装置其他设备均实现国产化1000 kt/a硫酸装置投产以来已稳定运行4个多月时间,除转化率略低于设计值外,其他各项技术指标均达到或超过设计值。实际生产中进转化器烟气φ（SO2）在18.1%～18.3%、氧硫比0.85～0.86,总转化率在99.93%、尾气ρ（SO2）在348.6～382.9 mg/m~3,电耗58.70～61.25 kWh/t。     

S1000-11型SO_2鼓风机提高参数的分析与应用

介绍了S1 0 0 0 1 1型SO2 鼓风机改型增容的分析与应用。通过综合改变该风机转子的结构参数 ,实现了扩容增产的目的 ,并在大型硫酸厂试用成功。     

200kt／a硫酸装置SO2风机起动故障浅析

受现场供电条件的限制,SO2风机起动采用限流起动模式,生产中因软起动柜主板烧坏造成SO2风机起动跳闸故障,严重影响正常生产。为防止故障再次发生,根据设备特性和工艺要求专门制定了SO2风机操作规程并改善现场盘柜的运行环境。     

800kt/a国产化硫磺制酸装置生产运行总结

阐述了800kt/a国产化硫磺制酸装置的工艺流程、各工序的工艺技术特点和设计指标,介绍了长期运行测定的主要工艺参数,该装置除催化剂外,所有装备和材料完全实现了国产化,其生产情况表明,各项工艺指标达到设计要求,排放尾气中SO2质量浓度仅46～75mg/m^3,认为该大型国产化硫磺制酸装置是成功的。     

800 kt/a国产化硫磺制酸装置生产运行总结

阐述了800 kt/a国产化硫磺制酸装置的工艺流程、各工序的工艺技术特点和设计指标,介绍了长期运行测定的主要工艺参数,该装置除催化剂外,所有装备和材料完全实现了国产化,其生产情况表明,各项工艺指标达到设计要求,排放尾气中SO2质量浓度仅46～75 mg/m3,认为该大型国产化硫磺制酸装置是成功的.     

进口SEL-16A型二氧化硫鼓风机修复再利用

介绍了SEL-16A型SO2鼓风机存在问题及改造措施。通过重新修复改造,该风机成功应用在新建的350 kt/a硫酸系统中。改造后SO2风机流量保持在1.4×105m3/h左右,风机轴振在0.7 mm/s左右,壳振均在1.0 mm/s以下,相比改造前的风机振动值降低了80%。风机修复再利用后,简化了启动操作,优化了控制操作,提高了风机整体性能。     

罗茨风机转子常见的摩擦故障维修经验

罗茨风机转子与转子的摩擦碰撞现象及转子前后墙板的摩擦现象较多。本文总结了一些处理这2种故障调整间隙方面的经验。现以MJL系列立式罗茨风机为例介绍。     

信息拾零

目前国内 2 0ｋｔ/ａ以下的小型硫酸装置仍有一定数量 ,大多采用“文—泡—文”水洗净化流程 ,工艺指标调节困难 ,特别是酸雾、水分在夏季经常超标 ,容易导致二氧化硫风机腐蚀。一般 2 0ｋｔ/ａ以下规模的硫酸装置配用的风机为罗茨鼓风机 ,在净化指标不良的情况下 ,会使风机转子渐开线面和转子筋面腐蚀 ,间隙增大 ,风机风量和风压逐渐降低 ,直到生产难以维持 ,最终停产更换转子或整台风机。安徽省庐江化工集团有限公司 2 0ｋｔ/ａ硫酸装置曾存在此类问题 ,平均每年花在风机上的费用在 5万元以上。为此 ,在加强工艺管理同时 ,工程技术人员带…     

我国首套10万等级空压机组试车成功

<正>2014年12月22日,我国首台(套)全国产化10万Nm3/h等级特大型空分主风机在陕鼓动力公司进行了工厂性能测试。经过测试,陕鼓动力研制的10万Nm3/h等级空分主风机气动性能达到设计和标准要求。这标志着陕鼓动力打破了国外公司垄断,具备了全国产化研发、制造特大型空     

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。