水泥预粉磨装备及技术发展现状的分析

重视预粉磨装备及技术的发展,就是重视水泥联合(半终)粉磨工艺系统的粉磨效果。联合(半终)粉磨系统中充分利用了料床预粉磨段粗处理的技术特性,同时发挥了管磨机段独有的磨细与整形功能,真正实现了“分段粉磨”过程中两段之间的优势互补。预粉磨段主机的吸收功耗越大,管磨机段主电机电耗降低越多,系统的总节电效果越显著。随着预粉磨段主电机功率与管磨机主电机装机功率比值的增加,预粉磨段处理能力进一步增大,投入的功耗越多,整个粉磨系统电耗降低的幅度也更大。在水泥粉磨生产线改造过程中,将高压力多辊外循环立磨用于预粉磨段,是降低粉磨电耗的发展方向之一。辊压机联合(半终)水泥粉磨系统中辊压机的吸收功耗至少应≥9.0 kWh/t,高值可以达到12.0 kWh/t,在此范围内越高越好。辊压机联合(半终)粉磨系统中,辊压机运行常常表现为不够平稳、时有偏辊现象发生、液压系统压力输出不稳定、操作不灵敏、液压系统现场“跑冒滴漏”严重、控制关键元器件购置困难等。建议采用辊压机SPC控制系统进行改造,以确保辊压机应保持稳定和较高的工作压力,确保良好的挤压做功能力,确保有更多的细粉产出,有利于系统高效低耗运行。     

辊压机双圈流半终粉磨技术改造传统水泥粉磨系统的实践

对Ф4.2m×13.5m双仓管磨机+SX3500C选粉机组成的水泥闭路粉磨系统实施改造,以CDG180-160辊压机+CDV11030V型选粉机+LSX6000三分离选粉机与Ф4.2 m×13.5 m管磨机+磨尾收尘风机+TUS5500高效双分级选粉机+成品收尘风机形成辊压机双圈流半终粉磨系统,P·O42.5级水泥产量从95 t/h增至296 t/h,工序电耗从42 kWh/t降至26.5 kWh/t。     

启新水泥厂生料系统特点及质量控制分析

启新水泥厂2 000t/d生产线的生料系统,采用辊压机与球磨机组合的半终粉磨工艺流程,这在辊压机参与粉磨的流程中是较先进的。半终粉磨是从预粉磨和联合粉磨发展而来的,是辊压机终粉磨的过渡型,其特点是:物料首先进辊压机,出辊压机的料饼由打碎机打散,然后进入高效选粉机将成品选     

辊压机三选粉水泥半终粉磨系统在成县祁连山项目的应用

成县祁连山水泥公司4500 t/d熟料预分解窑水泥生产线采用辊压机三选粉水泥半终粉磨系统,系统由Ф180-120辊压机配Ф4.2 m×13.5 m管磨组成。该系统的辊压机系统和管磨机系统具有很强的独立性,能很好地实现"分段粉磨"功能。该系统生产P·O42.5水泥,产量稳定在290 t/h,工序电耗26 kWh/t左右。实践证明该系统对辊压机系统和磨机系统各自成品质量和比例的灵活控制能力,有利于调节最终的水泥成品质量。     

水泥磨半终粉磨系统的技改

对水泥磨系统进行节能降耗改造,在球磨闭路粉磨系统之前增加HFCG180-160型大辊压机,组成HFCG180-160辊压机+Φ4.2 m×13.5 m球磨机的水泥半终粉磨系统（开路）。技改后的半终粉磨系统平均台时产量由95 t/h提高到250 t/h,粉磨工序电耗从38.0 kWh/t降低到24.0 kWh/t,单产电耗平均降低14.0 kWh/t。     

水泥联合（半终）粉磨系统增产降耗影响因素分析

国内应用的高效率料床粉磨设备辊压机（或外循环立磨）作为管磨机前预粉磨设备与管磨机和高效选粉机组成的水泥联合（半终）粉磨系统（开路或闭路）,相对优秀的水泥粉磨电耗指标已达到≤22 kWh/t,甚至极少数粉磨电耗达到≤20 kWh/t,较差粉磨电耗水平仍有≥38 kWh/t。本文以多个实际生产案例为依据,分析了影响水泥联合（半终）粉磨系统产量及电耗的相关因素。探讨了将辊压机双闭路水泥联合粉磨系统改造为双闭路水泥半终粉磨系统,实现增产降耗的技术途径。     

工艺审计系统优化方法在水泥粉磨系统技改中的实践

Φ4.2 m×13.5 m管磨机+HFCG140/80辊压机组成的闭路联合粉磨系统,产量:125 t/h,电耗:36.4 kWh/t,利用工艺审计系统优化方法对该粉磨系统进行全面工艺审计,现场查看找出了该粉磨系统在辊压机、打散机、选粉机、磨机、风机等方面存在的磨损和结构问题,通过测量数据、取样数据分析找出差距和瓶颈.针...     

低角度微气力辅助输送管道在水泥磨上的应用

我公司于2003年建成投产1条2500t/d熟料生产线(8号窑),与之配套的制成车间12号、13号粉磨生产线均采用Φ3.8m×13m开流高效筛分水泥磨及HFCG140/65辊压机和HF-SC140/60打散机组成的预粉磨系统。因预粉磨系统留有跨度7m的半终粉磨设计空间,在工艺设计时将打散机成品出料管与磨机     

Φ3.2 m×13 m球磨机系统提产降耗技改

为了响应国家节能减排的政策,水泥粉磨系统中的小辊压机成为技改重点。本文针对小辊压机配Φ3.2 m×13 m球磨机的半终粉磨系统,改为采用大辊压机配小球磨机组成联合粉磨开路系统的思路进行系统性优化改造。经过改造后,该粉磨系统产量由70 t/h提高到185 t/h,粉磨工序电耗由37.8 kWh/t降低到26.5 kWh/t,实现了提产节能降耗的目标。     

新型辊压机联合粉磨系统的设计和应用

在辊压机的各种粉磨流程中,由辊压机、球磨机和选粉机组成的联合粉磨系统具有优质、高产、低消耗等综合优势。本文结合国内某4500t/d项目应用的改进型辊压机联合粉磨系统（亦称半终粉磨系统）的运行情况,对该系统特点、调试过程中遇到的问题及改进措施进行了总结。     

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。