疏水阀的正确选用与安装维护

简述了疏水阀的分类及工作原理,主要论述了疏水阀的正确选择与安装维护,以使蒸汽系统的安全运行得到有效保证。     

疏水阀与节能

<正> 节能是当前工业发展的一项重要任务,合理地选择和使用疏水阀是蒸汽系统节能的一个重要方面。目前工厂在蒸汽系统中的浪费较大,效率较低,在疏水阀的使用上既有质量和技术问题,又有选择和管理问题,这些问题对节能的影响很大,应引起重视。蒸汽疏水阀的作用:一是“阻汽”,即让蒸汽热能在用汽工艺设备上充分利用;二是“疏水”,即让热力管网和用汽工艺设备中产生的凝结水及时排除出去,以确保管网系统的正常运行,这对于提高工艺用汽设备的热效率和蒸汽的有效利用有着十分重要的作用。     

蒸汽管道疏水阀的选型及常见故障解析

介绍了在石化装置中蒸汽管道疏水阀的作用、常见形式、疏水阀的选型计算以及疏水阀在实际使用过程中的常见故障解析及排除.     

怎样避免蒸汽疏水阀失效

提出疏水阀选择和应用设计中应注意的问题 ,以便能够长期稳定地运行。     

蒸汽疏水阀选型原则

根据疏水阀的国家标准和实际使用效果,采用定性、定量相结合的方法,分析蒸汽疏水阀的选型原则,提出选型建议。     

蒸汽过热炉炉管材料的选用

从炉管使用工况分析其对材质的性能要求,介绍了ZG45Cr28Ni48W5Si2的化学成分、机械性能、宏观组织和微观组织,实践证明该材料的可靠性高,采用离心铸造炉管,内外表面经机械加工的工艺是正确的.     

基于TOPSIS原理的注汽管线保温材料优选

注汽管线保温材料的性能影响管线保温情况,进而影响稠油油田生产能耗。通过实地调研与理论研究相结合的方法,基于TOPSIS原理建立一种优选保温材料的评价体系,通过TOPSIS原理与熵权法、层次分析法结合,优选注汽管线保温材料。     

化工园区蒸汽管道走廊的选择

化工园区蒸汽管道走廊的选择,要求形式多样,与园区的布局匹配,且满足企业的用汽需求,根据园区已有的管廊的形式,确定新增蒸汽管道走廊的方式。     

蒸汽蓄热器配套调节阀的选型与验证

根据蒸汽喷射试验系统的工作原理,从流量系数判定、阀型选择和阀体材料选择3方面研究了调节阀的选型方案,并从流量和噪声两方面对调节阀进行了验证,结果表明:基于所提方案选择的蒸汽蓄热器配套调节阀能够满足蒸汽喷射试验系统的工作要求。     

制氢装置蒸汽转化炉的选型

介绍了蒸汽转化炉的以供热方式炉型的特点。并阐述了油煤新技术开发公司新建5万Nm3/h制氢装置蒸汽转化炉根据目前制氢工业化装置应用转化炉结构特点,进行转化炉的选型、采用的技术、结构特点、顶烧蒸汽转换炉对工况的适应情况。以确保装置建成后高效及长周期运行,产品质量达到设计要求。     

电厂蒸汽管道补偿器的选型与安装

简单介绍电厂蒸汽管线补偿器的选用、安装及使用情况.     

The Active Space of Mexican Rice Borer Pheromone Traps

The Mexican rice borer, Eoreuma loftini (Dyar) (Lepidoptera: Crambidae), is an invasive pest of sugarcane, Saccharum spp., rice, Oryza sativa L., and other graminaceous crops in the United States. Traps baited with the synthetic female sex pheromone of E. loftini are used for monitoring and management of this invasive pest. However, the active space, or radius of attraction, of these traps is not known. Two field experiments examined the effect of intertrap distance on trap captures with hexagonal arrays of traps deployed in rice stubble habitat in Texas (2011) and Louisiana (2013). Trap capture increased with increasing intertrap distance. Trap interference occurred at intertrap distances ≤50 m in the 2011 experiment. Results from the experiment conducted in 2013 indicate that trap interference occurs at intertrap distances of 50 m, but not at distances ≥100 m. These results suggest that under field conditions, E. loftini pheromone traps attract males from distances of 50–100 m. The active space of pheromone traps also was examined under controlled wind conditions by direct observation of male response to detection of the female sex pheromone. Eoreuma loftini males responded to the pheromone blend by becoming active, fanning their wings, and rapidly walking in circles. The mean distance from the pheromone source at which males responded was 47.6 m. This work provides the first documentation of active space for traps baited with female sex pheromone for a crambid species, and these data will improve pheromone trap deployment strategies for E. loftini monitoring and management.