烟气氧含量闭环控制

本文介绍工业窑炉烟气氧含量的几种闭环控制方案,同时具体介绍搪烧炉采用氧化锆氧量分析仪构成氧量闭环控制的情况。     

氧化锆氧量分析仪及其调节系统在沸腾炉上的应用

在硫酸生产过程中,沸腾炉操作稳定与否直接影响硫酸生产的全过程。因此,对沸腾炉加矿进行自动调节是整个硫酸系统能否稳产,高产的关键。南化公司磷肥厂硫酸五系统系120kt/a的大型装置,80年代初,在南化公司研究院科研人员的协助下,成功地将氧化锆氧量分析仪用于沸腾炉出口气体的氧量检测,并组成调节系统,以自动调节加矿量,实现了氧表及其调节系统在大型硫酸系统上的应用。     

有效的节能仪表——氧化锆氧量分析仪

本文介绍了新型的氧量分析仪——氧化锆分析仪的组成、工作原理、日常使用维修中应注意的事项和应用的效果。     

氧化锆氧量分析仪在沸腾炉上的使用经验浅谈

氧化锆氧量分析仪是70年代末期在我厂硫酸车间沸腾炉上开始试用的。我厂先后使用了南化研究院开发研制的三代氧表产品,通过近十年的不断改造、更新和完善,氧表已成为我厂硫酸生产不可缺少的重要检测控制仪表,并且给我厂硫酸生产带来了一定的经济效益。用氧表控制沸腾炉自动加料焙烧,可以使沸腾炉焙烧达到最佳状况,从而降低产品能耗,提高硫酸产量,稳定生产系     

隔爆型氧化锆分析仪的系统设计

介绍隔爆氧化锆分析仪的系统设计和各单元的结构设计及主要零部件的防爆设计,包括隔爆检测器及转换器、各种导流管、校验箱等。提供了一种能够在易燃易爆、高温环境下使用的隔爆型氧化锆氧量分析仪,为石油石化行业等危险场所的氧含量测量提供了一体化的解决方案。     

投产鉴定

硫酸焙烧炉直插式氧化锆氧量分析仪 通过江苏省科委技术鉴定 由南京化学工业（集团）公司研究院研制的硫酸焙烧炉直插式氧化锆氧量分析仪,最近在南京通过了江苏省科委组织的技术鉴定。 该分析仪采用氧浓差电池原理,尤其适用于硫酸焙烧炉的恶劣气氛下氧含量的直接插入在线检测。经江苏省计量测试技术研究所对样机的测试表明,其技术性能全部达到和优于原设计指标。该仪器测量电极的制备工艺方法及测量电极保护层的涂敷具有创新性和实用性,可在含有大量二氧化硫、矿尘。水蒸汽、酸雾及其他对氧量检测产生中毒作用的恶劣气氛中长期稳定运行…     

WY—Ⅱ型测氧仪在硫酸系统中的应用

我厂硫酸生产系统(40kt/a),于1987年7月在南化公司研究院的协助下,安装了一套ZO—103型氧化锆分析仪,对沸腾炉加矿进行自动控制。经过科研人员的调试,同年8月份投入运行,效果基本满意。经过一段时间的运行,发现两个问题:(1)由于ZO—103型分析仪为非线性输出,当氧量上升至量程的2/3处时,控制作用便有所减     

氧量分析仪在电厂锅炉中的应用

介绍氧化锆氧量分析仪的工作原理、结构、安装和日常维护,及其在硫磺装置和煤油加氢装置中的国产化应用.     

WY－Ⅱ型测氧仪的应用

ＷＹ－Ⅱ型测氧仪的应用我厂硫酸生产系统（４０ｋｔ／ａ）于１９９１年１１月，在南化研究院的协助下，安装了一套ＷＹ－Ⅱ型氧化锆氧量分析仪，对沸腾炉加矿进行自动控制。经过一年多时间的使用，取得了较明显的经济效益。使用该表后有如下主要优点：ａ．生产稳定、产量...     

搪烧炉烟气氧含量的闭环控制

在U型燃油搪烧炉中设置闭环氧量控制系统。由氧化锆探头测出烟道气中的氧含量,经氧量变送器输出电信号,用调节器进行PI运算,再转换成压力信号。由此控制二次风量大小,以保持最低过剩空气量,达到节能目的。     

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。