SHELL煤气化飞灰输送过滤器滤芯断裂原因分析及改进措施

通过对SHELL煤气化项目中飞灰输送过滤器滤芯断裂状况的分析,依据滤芯断裂面的形貌和过滤器的实际工况,综合分析了滤芯断裂的原因,然后给出了相应的改进措施和实施改进的注意事项,改进后设备运行效果良好。     

壳牌煤气化中高温高压过滤器的应用

主要分析了高温高压过滤器在壳牌煤气化中的应用,介绍了高温高压过滤器的结构和工作原理及故障原因,并提出避免滤器、滤芯断裂的有效措施。     

五环炉煤粉锁斗高压过滤器滤芯断裂原因分析与对策

分析了五环炉煤粉锁斗高压过滤器S03202A/B在煤循环期间滤芯断裂,断裂滤芯落至V03205底锥流化板造成煤粉管线不稳,速度计和密度计都出现波动很大的问题及原因分析;实施了对煤粉锁斗高压过滤器的相关技术改造;解决了滤棒断裂导致的煤线波动,保证了五环炉的正常运行。     

己二酸装置烛式过滤器单元操作的优化

通过对己二酸装置烛式过滤器的介绍与说明,对己二酸生产中烛式过滤器存在滤棒经常断裂的问题进行分析,并提出了针对性的改善措施,优化己二酸装置烛式过滤器的操作,保持烛式过滤器的长周期稳定运行,最终达到降低生产成本,增强公司核心竞争力。     

SCGP陶瓷滤芯断裂原因分析及Fe_3Al金属滤芯安装

SCGP的高温高压飞灰过滤器是典型的干法除尘设备,在实际运用的过程中存在陶瓷滤芯的断裂问题,造成大量飞灰进入下游工艺系统,从而造成全厂停车。文章将简单介绍SCGP高温高压飞灰过滤器的结构及过滤原理,分析陶瓷滤芯断裂原因,操作中积累的经验。另外,简单介绍本装置金属滤芯的更换安装。     

过滤器滤芯国产化开发应用项目通过评定

正2016年5月19日,"催化裂化油浆过滤器滤芯国产化开发应用"通过项目评定。据介绍,燕山石化公司三催化油浆过滤器采用国外一家公司生产的金属粉末滤芯,价格昂贵,滤芯粉末体与连接头焊接部位开裂,导致滤芯多次发生断裂;过滤精度达不到设计要求;过滤器上压快,连续运行周期只有15天到6个月。为此,在中国石化科     

煤气化锁斗高压过滤器滤芯断裂原因及改进措施

为了减少和避免煤气化锁斗高压过滤器滤芯的断裂,降低设备故障率,提高煤气化装置的开车率和保证其长周期稳定运行,研究了多个项目现场中的滤芯断裂状况。结果表明:滤芯的断裂状况大都相似,断裂部位大都在滤芯根部且往往伴随有滤芯管体的弯曲。综合分析了滤芯断裂的原因,提出了相应的改进措施和注意事项。     

分离高温高压粗合成气飞灰用过滤器滤芯的比较

飞灰过滤器滤芯的断裂影响壳牌粉煤加压气化炉的安全稳定运行,为此分析了高温高压飞灰过滤器滤芯的工作原理,介绍了陶瓷滤芯和金属滤芯的再生方法,比较了二者清洗前后的应用效果。生产实践表明,首次投入运行,陶瓷滤芯比金属滤芯应用效果好,清洗后,二者都可重复使用,效果都比首次使用差,但金属滤芯能够耐更高压差而不断裂,延长滤芯装置运行时间。     

过滤器滤芯断裂原因分析

介绍了云南云天化股份有限公司壳牌煤气化装置过滤器在运行中出现的滤芯断裂故障情况,从气化炉温度控制、反吹气压力、反吹气温度、滤芯质量、设备负荷等方面进行了原因分析并提出了相应的解决措施和建议,希望对以后壳牌煤气化装置过滤器内件滤芯折断故障的解决有所启示和帮助。     

高温高压过滤器滤芯的断裂分析

介绍了高温高压飞灰过滤器滤芯的结构和作用;分析滤芯断裂的现象和原因;简述了滤芯的使用和维护。     

Factors that influence the flexural strength of SiC-based porous ceramics used for hot gas filter support

The influences of molding pressures, bonding phase contents, and SiC particle sizes on the flexural strength of SiC-based porous ceramics were investigated based on their microstructure of fracture surface. The SEM morphologies and EDS element analysis results of fracture surface showed that there were two different kinds of fracture points: SiC particle fracture points and bonding phase fracture points. It is found that molding pressures, bonding phase contents, and SiC particle sizes affect the SiC particle fracture point area in the fracture surface, and the fraction of the SiC particle fracture point area in the minimum solid area of fracture surface is a determined influence factor for the flexural strength of SiC-based porous ceramics used for hot gas filter support.     

600kt／a DAP装置回转干燥机传动系统故障分析及对策

600kt/aDAP装置回转干燥机传动系统故障停机占整个干燥机故障停机时间的80%.其中,鞍座底板断裂、鞍座连接螺栓和销轴断裂,通过断口形貌和受力分析,判断故障原因为典型的疲劳断裂;大小齿面磨损变形严重是齿轮硬度不足、齿面接触应力超过材料抗剪屈服极限及润滑方法不当造成.并提出改进对策.     

Influence of porosity on mechanical properties of tetragonal stabilized zirconia

3YSZ specimens with variable open porosity (1–57%) were fabricated, and the stiffness, strength and fracture properties (fracture toughness and R-curve) were measured to investigate their potential use as support structures for solid oxide fuel or electrolysis cells. The ball-on-ring test was used to characterize Young's modulus and Weibull strength. The variation of fracture toughness with porosity was investigated and modelled using the results from fracture mechanical testing. A distinct R-curve behaviour was observed in dense 3YSZ specimens, in samples with a porosity around 15% and in some of the highly porous samples (porosities ～45%) reflecting a transformation toughening in the material. For the most porous samples, the “R-curve behaviour” disappeared and subcritical crack growth was observed. The studies indicate that even highly porous 3YSZ structures (porosities exceeding 40%) are feasible supports for SOFC/SOECs from a mechanical point of view.     

新场须二段致密砂岩储层有效裂缝支持向量机的识别

新场地区须家河组二段储层以低孔渗、超深超压、致密砂岩地质特征为主。该地区目地层段裂缝是主要的储集和流通空间。裂缝识别是裂缝性储层勘探和开发研究中的关键问题和难点之一。基于岩芯样品裂缝类型的统计和分类,运用支持向量机（SVM）对储层裂缝的有效性进行评价。结合取心井段岩芯裂缝的检验,证实该方法对裂缝评价效果与地层的实际情况相符,能较好的反映裂缝的发育情况。对该地区裂缝型储层的开发具有一定的借鉴作用。     

Altered Secretome of Diabetic Monocytes Could Negatively Influence Fracture Healing—An In Vitro Study

Diabetes mellitus is a main risk factor for delayed fracture healing and fracture non-unions. Successful fracture healing requires stimuli from different immune cells, known to be affected in diabetics. Especially, application of mononuclear cells has been proposed to promote wound and fracture healing. Thus, aim was to investigate the effect of pre-/diabetic conditions on mononuclear cell functions essential to promote osteoprogenitor cell function. We here show that pre-/diabetic conditions suppress the expression of chemokines, e.g., CCL2 and CCL8 in osteoprogenitor cells. The associated MCP-1 and MCP-2 were significantly reduced in serum of diabetics. Both MCPs chemoattract mononuclear THP-1 cells. Migration of these cells is suppressed under hyperglycemic conditions, proposing that less mononuclear cells invade the site of fracture in diabetics. Further, we show that the composition of cytokines secreted by mononuclear cells strongly differ between diabetics and controls. Similar is seen in THP-1 cells cultured under hyperinsulinemia or hyperglycemia. The altered secretome reduces the positive effect of the THP-1 cell conditioned medium on migration of osteoprogenitor cells. In summary, our data support that factors secreted by mononuclear cells may support fracture healing by promoting migration of osteoprogenitor cells but suggest that this effect might be reduced in diabetics.     

初始缝高比对钢纤维混凝土断裂性能的影响

为研究初始缝高比对钢纤维混凝土断裂性能的影响,对三种不同初始缝高比(0.1、0.2、0.3)的钢纤维混凝土开展断裂韧性试验,计算相关的断裂参数,并借助声发射(AE)和数字图像法(DIC)分析了裂缝发展过程中AE能量和全场应变的变化规律。结果表明,钢纤维混凝土的断裂韧性随初始缝高比的增大呈减小趋势,当初始缝高比为0.3时钢纤维混凝土的断裂性能大幅下降。钢纤维混凝土的断裂过程可根据AE能量划分为弹塑性阶段、裂纹稳定扩展阶段和断裂阶段,随初始缝高比增加,弹塑性阶段持续时间减少。DIC分析结果表明,在整个加载过程中,预制裂缝尖端会产生较大的应力集中,裂缝的横向应变较大。研究结果揭示了钢纤维混凝土裂缝发展机理,可为其工程应用提供理论支持。     

双侧支持钢板内固定治疗胫骨近端粉碎性骨折86例临床探讨

目的探讨采用双侧支持钢板内固定治疗胫骨近端粉碎性骨折的临床疗效。方法回顾性分析2009年3月至2011年3月我院采用双侧支持钢板内固定治疗的86例胫骨近端粉碎性骨折患者的临床疗效,并以同期采用闭合复位经皮锁定钢板内固定治疗的86例胫骨近端粉碎性骨折患者为对照组,比较2组治疗效果和安全性。结果观察组患者手术时间、术中出血量、手术并发症发生率均低于对照组,组间比较差异具有统计学意义(P<0.05);观察组优良达94.17%,略高于对照组,组间比较差异无统计学意义(P>0.05)。结论双侧钢板内固定治疗胫骨近端粉碎性骨折,安全可靠,值得临床借鉴。     

The fracture probability of high impact polystyrene

A theory is developed to describe the fracture probability of high impact polystyrene. By assuming that fracture initiation is a consequence of the impingement of crazes due to the craze thickening process, an equation for the fracture probability as a function of the strain is derived. Experiments support the validity of this equation qualitatively while the stress and temperature dependence of the fracture probabilty correlate in the expected manner with the strain rate. An approximation allows the calculation of the fracture probability as a function of time.     

循环泵轴断裂原因分析

通过硬度测试 ,金相检验 ,断口分析等方法 ,对循环泵轴断裂原因进行了分析。结果表明 ,循环泵轴的失效方式为多裂纹源疲劳断裂 ,轴的表面有一圆弧过渡区 ,表面加工刀痕较明显 ,造成尖锐的缺口 ,使应力集中增大 ,易于裂纹产生 ,成为裂纹源 ,内螺纹应力集中处也是萌生的裂纹源的场所。轴的组织为网状铁素体加索氏体组织 ,疲劳抗力低 ,易于疲劳裂纹的扩展。疲劳裂纹扩展到临界尺寸时 ,轴的断面已不能承受给定载荷时 ,轴瞬间断裂     

Experimental study of Fractue of Glass: II, Experimental Data

Original studies and experiments that support the concept of the close association between fracture origin and flaws in glass are presented. The effect of temporary overstresses, fracture velocities during the later development of the process, and evaluation of the critical stress are discussed. Data are presented which show that temporary overstresses may weaken glass permanently and that this effect results from the slow propagation of fracture flaws. The study of fracture surfaces reveals that the velocity of the fracture crack across the section is not necessarily uniform and that the velocity characteristics of each individual fracture are determined by factors such as degree of load relaxation occurring during the dynamic phase of the process. The critical stress is estimated to be between 2.5 and 5 million lb. per sq. in., and, for any particular glass, this stress is independent of test conditions.