LG36/0.65型螺杆压缩机振动原因分析及改造措施

针对中海石油炼化有限责任公司惠州炼化分公司火炬气回收LG36/0.65型螺杆压缩机组出现振动偏大的情况,通过现场振动监测及频谱分析结合,找出了机组振动偏大的主要原因,提出了解决方案及采取了相应改造措施,螺杆压缩机振动烈度明显减小,数值下降到允许范围内,达到满意的效果。     

CO2 螺杆压缩机的维修及使用要点

我公司采用LG435-0.06/0.44型螺杆压缩机组加压输送CO2气体,正确合理的检修、操作方法对压缩机组平稳运行至关重要。我公司地处高原,氧气稀薄、昼夜温差较大,自2005年投产至今,压缩机在运行当中出现了多种不同的故障;螺杆压缩机属于精密设备,压缩机密封件、转子、同步齿轮等部件的间隙精度要求非常高,由此总结出压缩机最佳的检修方法及压缩机转子、同步齿轮等各密封部件合适的间隙范围,保障压缩机安全、平稳、长周期的运行,满足生产需求。     

无油螺杆压缩机在燃料电池中的应用

由于环境污染、全球变暖、能源短缺等各方面原因,能量转换效率高且无污染的燃料电池汽车备受人们的青睐,作为燃料电池系统中重要部件之一的空气压缩机也成为研究的热点。西安交通大学压缩机研究所成功研制了可以应用于燃料电池的LG300型喷水螺杆空气压缩机以及具有体积小、质量轻、效率高的高速干式螺杆压缩机、膨胀机,并且经过与燃料电池系统配套使用,获得成功。     

新型止回阀在纯碱CO2螺杆压缩机上的应用

论述纯碱CO2螺杆压缩机安装排气止回阀的重要性,并对不同型式止回阀进行了比较,最后发现FSE-H76YC4型螺杆压缩机止回阀的应用具有明显的安全和经济价值优势。     

螺杆式压缩机组检修实践

LG435-0．06／0．44型螺杆压缩机组频繁开、停机，对设备性能影响极大，严重时不能重新开机。经过多次实践，我们提出具体的检修措施和使用措施，现基本解决了频繁开、停机对设备的影响，也减少了对生产的影响，降低了设备维修费用。     

螺杆压缩机排气温度升高故障分析

针对LG30／0．5火炬气螺杆压缩机出口温度过高，对外不做功等几种原因进行了分析。找出问题的本质原因后，采取相应的措施予以解决，并对该类机组常见的问题作了总结。     

双螺杆压缩机超温故障分析与对策

螺杆压缩机是混合脱氢分离系统的制冷设备,在保证装置长周期安全运行中起到了重要作用。本文的研究对象为螺杆压缩机在实际生产运行时产生高温的现象,这个高温现象主要是指螺杆压缩机的主机排气温度方面。通过介绍螺杆压缩机的结构以及原理,针对超温这一现象做出专门的研究分析,对其不同情况做出了应对措施。     

LGW25/16-38/8型螺杆压缩机故障原因及对策

LGW25/16-38/8型螺杆压缩机,是由无锡压缩机股份有限公司制造生产的一种无油螺杆双缸压缩机组,现就压缩机组故障原因和解决的方法进行分析和总结,供大家参考。     

喷油工艺螺杆压缩机的特点及应用分析

介绍了喷油螺杆压缩机的结构特点,着重介绍了喷油螺杆压缩机在工艺流程领域的应用情况,指出喷油螺杆压缩机的应用领域正在不断拓展,逐步取代了部分往复式压缩机.     

探讨螺杆空气压缩机在高粉尘环境中的应用

本文在分析在螺杆压缩机发展现状与应用的基础上,讨论了国外双螺杆压缩机在我国的应用;螺杆压缩机负责压缩并输送气体,其运行质量的好坏直接影响到下一阶段生产的顺利进行,论文最后提出了螺杆压缩机故障诊断相关问题,有利于我国螺杆压缩机技术的发展。     

LG31.5A螺杆式制冷压缩机失效分析及技改

分析了LG31.5型螺杆式制冷压缩机主机失效原因及机组运行中存在的问题,对机组进行了针对性的综合技改,实现了压缩机的安全稳定长周期运行,降低了检修费用.     

LLDPE-g-PGMA对PBT/LLDPE共混物的增容作用

用线性低密度聚乙烯接枝甲基丙烯酸缩水甘油酯（LLDPE－g-PGMA，简称LG）作为反应型增容剂，来改善聚对苯二甲酸本二酯（PBT）与LLDPE共混物的相容性，考察了LG的加入对PBT端羧基含量的影响，以及LG的加入量对不同配比共混体系力学性能的影响，并用扫描显微镜（SEM）对共混物形态结构进行了表征。研究结果表明，LG的加入降低了共混物中PBT的端羧基含量，改善了共混物中两相的相容性，使共混物的冲击强度提高58％以上。     

Scale-up rules for mixing in a non-intermeshing twin-screw extruder

Various scale-up rules and theories have been presented for extrusion, including both single- and twin-screw extruders. Until now, however, most of these theories have concerned fully-filled channels, not only for twin screw extruders of the co-rotating fully intermeshing type (COTSE) or non-intermeshing counter-rotating type (NITSE), but single screw extruders as well. As the demand for distributive mixing and devolatilization devices increases, more and more nonintermeshing twin screw extruders with regions of partially-filled channels are being used. Therefore, developing scale-up rules for such screw extruders is imperative. In this paper, scale-up rules are developed, theoretically and experimentally, by examining the relationship between distributive mixing and important flow parameters. Two partially-filled NITSE's, with screw diameters of 0.8 and 2 inches, have been studied by using a flow visualization technique entailing a dye tracer to study the effects of distributive mixing by varying such parameters as: percentage of drag flow, screw stagger, and screw velocity. Qualitative evaluation of the spread of the dye with the number of screw revolutions was obtained from videotape of the experiments. Factorial experimental design method has been applied for evaluating these results. Finally, new scale-up rules were developed and compared with rules in the literature.     

采用LG系列超细粉碎机对猛炸药进行超细化研究

介绍了 L G型系列粉碎机的工作原理及主要特点 ,并对采用该机对猛炸药 (HMX及 RDX)进行超细粉碎时的影响因素进行了研究 ,同时给出了这两种材料在采用该机进行湿式粉碎时的极限粒径。研究结果表明 ,该类粉碎机作为炸药及火工药剂的超细粉体制备设备 ,具有生产安全 ,能耗低 ,生产效率高 ,产品质量稳定、可靠等优点     

聚乙烯与过渡金属介入对木质素热解过程中表面官能团演变的影响

木质素(LG)含氧量高,化学结构复杂,难于资源化利用。共混剂和催化剂的介入,能够强化LG分解,有效提高其利用效率,但具体机制尚待进一步剖析。本文基于原位红外手段,考察低密度聚乙烯(PE)和过渡金属(Ni、Fe、Mn)的添加对造纸黑液LG表面官能团演变的影响。研究结果显示,LG在200℃左右从C—C连接键开始逐渐分解(波数在2044 cm^-1处),而含氧表面官能团在500℃以后才开始减少(波数在1040～1645 cm^-1和3450～3600 cm^-1处的—OH、C—O、C—O—C和C＝O等)。PE的介入,在400℃左右即能开始促进LG含氧表面官能团的脱除,在500℃左右即能实现大部分含氧表面官能团的脱除。而Ni的添加,能够强化LG与PE之间的相互作用,使得LG中大部分含氧表面官能团在PE快速分解阶段(460℃左右)即脱除。另外,工艺参数,包括过渡金属种类、过渡金属浓度、LG与PE混合比例、升温速率等均对混合体系中LG和PE的相互作用存在不同程度的影响。本文从表面官能团变化的角度为LG的资源化利用提供了重要技术指导。     

螺杆挤出技术加工火炸药的研究进展

从螺杆挤出技术加工火炸药的安全性分析、所加工物料类型以及物料性能改善三方面综述了火炸药螺杆挤出技术的研究进展,指出单螺杆挤出技术存在内摩擦力较高和双螺杆挤出技术建压不足等问题,说明了锥形双螺杆挤出机加工火炸药的适应性。     

犁钉螺杆在VC403上纺制PP长丝的应用

在VC403纺丝机上应用犁钉螺杆生产PP长丝。生产实践表明:犁钉螺杆以分流三维混合为特征,加大了槽深,强化了剪切、混合。与常规螺杆相比,生产过程稳定,工艺易于控制,产品物理性能指标提高,不匀率降低,相同工艺条件下,产量约增加30%;同样产量下,螺杆转速、加热温度降低,减少了能耗。     

Effect of grazing intensities on the activity and community structure of methane-oxidizing bacteria of grassland soil in Inner Mongolia

The effects of different grazing intensities on in situ methane flux and the structure and diversity of the methanotrophic community are measured in the typical grassland of Inner Mongolia. Four grazing intensity sites founded in 1989, control (CK), low-intensity grazing (LG), middle-intensity grazing (MG) and heavy-intensity grazing (HG), were selected. Group-specific PCR-DGGE (polymerase chain reaction-denaturing gradient gel electrophoresis) of 16S rRNA genes for the type I and type II methanotrophs was used to characterize the composition of the methanotrophic community. DGGE patterns were further analyzed using the method of the Shannon-wiener index H and non-metric multi-dimensional scaling (MDS). The results showed that there were no significant differences in methane flux among different sites, yet methanotrophic communities showed significant differences. MDS analysis showed that type I methanotroph community composition at the CK site were significantly different from the three other sites. For type II methanotrophic community composition, it was similar between CK and HG site, and between LG and MG site, while that at the former two sites were significantly different from latter two ones. Additionally Shannon indices of type II methanotrophs were higher at the LG and MG sites than two other sites. Though grazing intensities had an impact on the structure of the methanotrophic community, management-induced changes in the structure of methanotrophic community did not reflect methane consumption capacity across sites. These results suggest that methane consumption is a complex process in soil, and we should be cautious when speculating on the change of methane consumption rates based on a change of methanotrophic community structure.     

间断式螺旋挤压过滤机

间断式螺旋挤压过滤机是一种高效过滤分离机械,间断式螺旋推进器是间断式螺旋挤压过滤机的重要部件。描述了间断式螺旋的特点、应用情况,并与普通螺旋挤压过滤机进行了对比,指出间断式螺旋挤压过滤机的优势及其发展前景。