更换焦炉总烟道翻板的新方法

本文主要介绍了一种原有焦炉总烟道翻板已失效,如何快速、便捷更换焦炉总烟道翻板的新方法。此新方法与传统方法相比,具有投资小,实施简单、安全和时间短等优点。更换后的焦炉总烟道新翻板具备操作简便、维护方便和经济适用,能很好地满足焦炉生产过程中总烟道吸力调节的需要,值得参考借鉴。     

焦炉烟道气余热利用的不足与改进

总结了焦炉烟道气余热回收装置投产初期出现的问题,并通过增加开孔及管道横截面积减少系统阻力,采用变频调节增加总烟道吸力,增设烟道电动插板阀隔断废气循环等措施,使烟道气余热回收装置达到设计效果。     

焦炉总烟道翻板的更换

1更换原因我厂3#焦炉为58-Ⅱ型1×65孔焦炉,于1976年建成投产。近几年因焦炉总烟道衬砖脱落,造成调节翻板与烟道墙壁之间的间隙增大,在焦炉正常生产加热过程中翻板的开关对吸力大小的调节不灵敏。当延长结焦时间或遇到特殊情况需要停止焦炉加热时,吸力难以控制,影响严密性。多次研究更换3#焦炉总烟道翻板,但由于没有先例和经验,为此我厂在做了充分的准备工作后,终于用2h完成了3#焦炉总烟道翻板的更换检修工作。     

焦炉加热系统计算机自动控制的应用

通过调节焦炉蓄热室顶部温度,对1、2、3号焦炉的加热系统进行了计算机自动控制。系统采用二前馈二反馈一监控的优化调控,同模糊控制与专家系统相结合的控制方案,建立数学模型,实现了焦炉生产参数的自动检测与显示,及焦炉煤气流量与分烟道吸力的控制。     

立火道在线测温与自动加热技术的应用

针对传统人工测量直行温度调节煤气流量和烟道吸力的方法存在的缺点,引进立火道在线测温与自动加热系统,并结合生产实际进行设备改进,提高了直行温度的稳定性,降低了煤气使用量。     

OCC工艺在宽幅焦炉上的研究与应用

根据宽幅焦炉的热工特点,在焦炉加热优化串级调控系统中（简称OCC工艺）．采用焦炉煤气加热单侧控制,用煤气主管压力进行炉温反馈调节,及与机、焦侧分烟道吸力相联动,实现焦炉加热全自动控制。实践证明,系统应用后焦炉炉温稳定、能耗降低、焦炭质量显著提高。     

OCCT艺在宽幅焦炉上的研究与应用

根据宽幅焦炉的热工特点，在焦炉加热优化串级调控系统中（简称OCC工艺）．采用焦炉煤气加热单侧控制，用煤气主管压力进行炉温反馈调节，及与机、焦侧分烟道吸力相联动，实现焦炉加热全自动控制。实践证明，系统应用后焦炉炉温稳定、能耗降低、焦炭质量显著提高。     

浅析JN60-3型焦炉热工管理

通过对焦炉热工管理工作中的煤气流量、结焦时间、标准温度、看火孔压力、烟道吸力、空气口开度、空气过剩系数、蓄热室顶部吸力、孔板直径可调节措施之间关系进行分析,找出适合JN60-3型焦炉生产实际所需要的控温方法,制定适合热工控制措施、焦炉炉温调节较为合理的方案。使全炉温度稳定且分布均匀,以达到使炭化室内煤料能均匀受热,从而生产出优质的炼焦产品并尽可能保持炉体结构的完整与严密。     

焦炉加热自动控制系统数学模型的述评

介绍了世界各国焦炉加热自动控制系统中所采用的目标火道温度、结焦终点判定、焦炉供热量、烟道吸力等数学模型。给出了焦炉传热模型获得的数学模型。     

具有多个可独立控制气流通道的小烟道结构

正本发明涉及一种具有多个可独立控制气流通道的小烟道结构,包括由蓄热室主墙和蓄热室单墙组成的小烟道,小烟道内部沿高向分为数层,每层中间设小烟道横向分隔墙,由小烟道衬砖、小烟道水平分隔墙/小烟道铺底砖、小烟道横向分隔墙组成的气流通道分别与蓄热室小格连通形成独立气流通道,每个气流通道入     

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。