内压式流程空分装置液体泵控制方案的设计与实施

正1概述我公司原有4套空分装置:建厂初期的5 000m3/h空分装置,已运行40多年,工艺落后,能耗较高;1986年二期扩建时建设的全低压外压缩6 000 m3/h空分装置,由于生产任务重,不能按期进行维护、检修,设备已出现不同程度的疲劳现象;2000年公司进行"1830"技改工程,配套新建的1套全低压、分子筛净化节能流程6 000m3/h空分装置,目前运行平稳,是生产线上的主力;2005年购置的1套国内二手KDON3800/3800型空分装置,虽然能达到设计工况,但工艺落后、设备能力不匹配、装置能耗高。     

40000 m3/h空分装置设备选型及优化的可行性分析

如今,我国煤化工产业正处于大发展的阶段,项目初期投资与运行能耗是需考虑的两个关键问题,对于空分装置来说尤其如此。据靖远煤业集团煤制合成气清洁高效综合利用项目(拟建在甘肃省白银市银东工业园区)配套2×40 000 m3/h空分装置建设规划的要求,项目组据40 000 m3/h空分装置的产品初步设计,以国内外大型机组(空压机与增压机)的性能及效率、低温液体泵的应用业绩与研发、银东工业园区环境条件等为出发点,结合国内大中型空分装置的工艺流程选择、配套设备选型及优化,在此基础上进行调研和比对,提出40 000 m3/h空分装置配套设施如空压机系统、水冷塔和空冷塔、分子筛纯化系统、膨胀机、高压板翅式换热器、精馏塔、主冷凝蒸发器、中压氮压机、低温阀门、仪表空压机、液氮/液氧/液氩贮罐等的选择及优化建议,旨在提升空分装置配套设备的单机效率,降低成套装置的运行成本。     

42000 m~3/h电拖空分装置建设及运行总结

新疆国泰新华矿业股份有限公司42 000 m~3/h电拖空分装置(即用一台电机拖动空压机、另一台电机拖动增压机)于2016年3月开始进行方案讨论及初步设计,2018年7月建成投运,目前装置运行基本稳定,各运行参数均在设计指标范围内。对42 000 m~3/h电拖空分装置建设基本情况——产品参数、工艺流程、设备配置进行介绍,总结其开车过程中出现的问题及采取的解决措施,对空分装置的主要能耗进行统计,并对42 000 m~3/h电拖空分装置5.6 MPa氧气的生产成本进行测算,以部分呈现此等产能规模电拖空分装置的能耗水平和运行成本,供业内参考与交流。     

航天炉粉煤气化装置循环水系统节能减排改造总结

<正>0前言安徽晋煤中能化工股份有限公司(以下简称中能公司)2008年投产运行的150 kt/a甲醇装置和2012年投产运行的200 kt/a合成氨装置使用航天炉制气,有2套配套的循环水系统,1#循环水系统(保有水量5 600 m3,循环量12 000 m3/h)与甲醇系统空分装置和联合装置、合成氨系统空分装置、精甲醇装置配套;2#循环水系统(保有水量     

22000 m3/h空分装置安全排液加温及节能分析

甘肃刘化(集团)有限责任公司22 000 m3/h空分装置采用中压膨胀空气进下塔、液氧液氮双泵内压缩、全精馏无氢制氩工艺流程。22 000 m3/h空分装置停车时,原通常采用带压(空压机在线)排液加温操作,存在诸多缺点或不足;近年来,依托已有的空压站、7 000 m3/h空分装置分子筛纯化系统提供的加温吹扫气源,经过对空分装置停车排液、静置、加温吹除等工艺操作环节风险因素的辨识,创新管理思路,22 000 m3/h空分装置排液加温操作中多采用空压机离线的节能模式(静压排液)。实践表明,通过采取一系列安全节能措施,合理控制冷箱内设备的关键部位、阀门及管线盲点排液,加快操作速度,空分装置排液加温实现了安全控制与节能降耗的双重目的。     

内压式流程空分装置液体泵控制方案的设计与实施

1概述我公司原有4套空分装置：建厂初期的5000m3／h空分装置，已运行40多年，工艺落后，能耗较高；1986年二期扩建时建设的全低压外压缩6000m3／h空分装置，由于生产任务重，不能按期进行维护、检修，设备已出现不同程度的疲劳现象；2000年公司进行“1830”技改工程，配套新建的1套全低压、分子筛净化节能流程6000m3／h空分装置，目前运行平稳，是生产线上的主力；2005年购置的1套国内二手KDON3800／3800型空分装置，虽然能达到设计工况，但工艺落后、设备能力不匹配、装置能耗高。     

LNG冷能空分装置优化改造

LNG冷能空分装置具有能耗低、运行费用低等优势,但是目前LNG冷能空分装置普遍存在频繁开停机问题,严重影响了空分装置的生产运行和经济效益,亟待解决。文中以国内首套冷能空分装置为研究对象,对冷能空分频繁停机的原因和结果分析,根据设备自身状况,提出利用液氮冷能方案,借助Aspen Plus模拟软件对空分装置进行模拟优化改造。模拟结果表明:换热器所需换热面积为69.61 m~2,需要液氮冷能18 110 kg/h。通过对方案经济效益分析可知,采用液氮冷能供应方案,可避免空分装置频繁停机,提高了项目经济效益。     

52 000 m3/h大型空分装置安装经验

简述国内自行设计、制造的首套52 000 m3/h空分装置在后期安装方面的主要问题及处理经验,对一些新建空分装置的安装有借鉴作用.     

30000m~3/h空分装置运行总结

介绍山西阳煤丰喜泉稷能源有限公司新建的30 000 m~3/h空分装置的工艺流程、设备配置、开车过程、运行中出现的问题、能耗指标、运行成本等,以使同行充分了解国内此类型空分装置的设备配置、能耗指标、建设工期、运行成本等情况。     

锅炉与空分装置及蒸汽放空阀联锁逻辑优化浅析

荆门盈德气体有限公司2019年8月底投产的煤化工项目产能为300 kt/a合成氨、500 kt/a甲醇及60 000 m3/h氢气,配套3台150 t/h的9.8 MPa蒸汽锅炉(两开一备)、2套60 000 m3/h汽拖空分装置(两开无备),9.8 MPa蒸汽管网设有1台放空阀(HV1001),HV1001全开放空量...     

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.     

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.     

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。     

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.     

Inorganic/organic nanocomposite coatings: The next step in coating performance

Inorganic/organic hybrid materials have considerable promise and are beginning to become a major area of research for many coating usages, including abrasion and corrosion resistance. Our primary approach is to prepare the inorganic phase in situ within the film formation process of the organic phase. The inorganic phase is introduced via sol-gel chemistry into a thermosetting organic phase. By this method, the size, periodicity, spatial positioning, and density of the inorganic phase can be controlled. An important aspect of the inorganic/organic hybrid materials is the coupling agent. The initial task of the coupling agent is to provide uniform mixing of the oligomeric organic phase with the sol-gel precursors, which are otherwise immiscible. UV-curable inorganic/organic hybrid systems have the advantages of a rapid cure and the ability to be used on heat sensitive substrates such as molded plastics. Also, it is possible to have better control of the growth of the inorganic phase using UV curing. It is our ultimate goal to completely separate the curing of inorganic and organic phases to gain complete control over the morphology, and hence optimization of “all” the coating properties. Thus far, it has been found that concomitant UV curing of the inorganic and organic phases using titanium sol-gel precursors afforded nanocomposite coatings which completely block the substrate from UV light while maintaining a transparent to visible light. Also, it has been found that the morphology of the inorganic phase is highly dependent on the concentration and reactivity of the coupling agent. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004, in Chicago, IL.     

Ethanol and (−)-α-Pinene: Attractant Kairomones for Some Large Wood-Boring Beetles in Southeastern USA

Ethanol and α-pinene were tested as attractants for large wood-boring pine beetles in Alabama, Florida, Georgia, North Carolina, and South Carolina in 2002–2004. Multiple-funnel traps baited with (−)-α-pinene (released at about 2 g/d at 25–28°C) were attractive to the following Cerambycidae: Acanthocinus nodosus, A. obsoletus, Arhopalus rusticus nubilus, Asemum striatum, Monochamus titillator, Prionus pocularis, Xylotrechus integer, and X. sagittatus sagittatus. Buprestis lineata (Buprestidae), Alaus myops (Elateridae), and Hylobius pales and Pachylobius picivorus (Curculionidae) were also attracted to traps baited with (−)-α-pinene. In many locations, ethanol synergized attraction of the cerambycids Acanthocinus nodosus, A. obsoletus, Arhopalus r. nubilus, Monochamus titillator, and Xylotrechus s. sagittatus (but not Asemum striatum, Prionus pocularis, or Xylotrechus integer) to traps baited with (−)-α-pinene. Similarly, attraction of Alaus myops, Hylobius pales, and Pachylobius picivorus (but not Buprestis lineata) to traps baited with (−)-α-pinene was synergized by ethanol. These results provide support for the use of traps baited with ethanol and (−)-α-pinene to detect and monitor common large wood-boring beetles from the southeastern region of the USA at ports-of-entry in other countries, as well as forested areas in the USA.