PTA装置FI-515薄膜蒸发器底部轴承改造

论述了刮板式薄膜蒸发器结构及工作原理、蒸发器在运行中出现的问题及原因,通过对传动部分、对底部轴承和底部短轴、石墨轴承进行改造,结果表明:改造后的蒸发器运行平稳,效果很好,提高了设备的正常运转周期,减轻了维修工人的劳动强度,为企业减少了检修费用。     

冷却塔减速机轴承的防水设计

介绍了造成循环冷却水冷却塔减速机轴承进水的原因，及进水对轴承产生的不良影响，分析了水引起的轴承磨损原因、机理；采用外加密封气装置对减速机轴承进行了防水改造。结果表明，通过导水环及密封气的作用可完全阻断水进入轴承的通路．且密封气的防腐作用使骨架油封寿命较原来有一定延长。     

离心式压缩机轴系仪表监测研究与改造

河北新欣园能源股份有限公司脱氢装置离心式压缩机主推力轴承埋入式铂热电阻频繁出现断裂失效,导致轴承温度无法正常监测.通过分析交流,对轴承铂热电阻穿线槽进行了改造,彻底解决了主推力轴承埋入式铂热电阻频繁出现断裂问题,保障了机组正常运行及监测.     

三相异步电机轴承改造寿命推算

三相异步电动机是石化企业使用最广泛的电机,许多企业都对原有电机进行双轴承改造.改造后的使用效果也比单轴承要好,轴承寿命延长许多.但这种改造究竟改变的优势在什么地方,以储运厂2台主输泵电机的轴承改造为例,从数学上揭示这种改造的合理性.     

高温风机的轴承改造

焦作水泥厂Φ 4. 2m× 65m四级悬浮预热器窑上高温风机引进于罗马尼亚,风量 220 000m3／ h,风压 6 370Pa, F式装配形式,径向式风叶,叶轮回转部分重约 3 000kg。轴承 22238K,相当于国产 153538轴承,轴承与轴靠紧定套锁紧定中。 1993年系统投运以来,轴承常出故障,为此于 2000年 1月对其支承部分进行了改造,改造中因有试验,也得到了其它方面的收获。 1轴承损坏的原因及分析 1. 1 叶轮支承结构形式如图 1图 1高温风机叶轮原支承结构 1. 2 轴承选型偏小 　　由于叶轮及联轴器靠近前轴承,所以前轴承承担了转子 2／ 3以上的负荷,加…     

20m2转鼓滤碱机搅拌机构的改造

主要介绍了滤碱机搅拌部分的改造，通过改造把轴承箱从一侧压盖可拆卸改为两侧压盖可拆卸，并且把传动轴从圆柱形过渡配合改为圆锥形间隙配合，解决了在维修过程中轴承箱中的轴承拆卸困难及传动轴和曲柄拆装困难的问题。不仅缩短了维修时间，减少了零部件的损坏，也提高了设备的运行可靠性。     

破碎机行走机构故障率高改造

洛阳石化焦化装置SP系列清蓖破碎机因现场运行环境恶劣及设备先天性缺陷导致破碎机行走机构轴承损坏严重,故障率高。自08年开工以来多次出现行走机构轨道轮轴承损坏事故,严重影响了装置的平稳长周期运行。针对此问题着手,对破碎机一系列缺陷进行改造,大大降低了行走机构轴承损坏的故障率。     

全加压“三合一”机组空压机联轴器及轴承改造

介绍了全加压硝酸离心式压缩机联轴器及轴承的改造方法。     

离心泵轴承润滑方式改造

对离心泵轴承润滑方式改造的原因、过程做了详细介绍,并对改造后的效果做了总结.     

高温风机的轴承改造x

焦作水泥厂Φ 4 2m× 65m四级悬浮预热器窑上高温风机引进于罗马尼亚，风量 220 000m3／ h，风压 6 370Pa， F式装配形式，径向式风叶，叶轮回转部分重约 3 000kg。轴承 22238K，相当于国产 153538轴承，轴承与轴靠紧定套锁紧定中。 1993年系统投运以来，轴承常出故障，为此于 2000年 1月对其支承部分进行了改造，改造中因有试验，也得到了其它方面的收获。 1 轴承损坏的原因及分析     

终缩聚反应器的故障分析及改进

介绍卡尔费休公司70年代聚酯装置增容改造后出现的故障和改造措施。终缩聚反应器短轴轴承损坏,螺栓断裂,划伤内壁。把短轴支撑的内轴承由原来的单列向心球轴承6040更换为滚子轴承42140;一次性树脂润滑改为浸油润滑,简单方法是在轴承腔体侧面开加油孔,向其内加入润滑油,彻底方法为增加一小型油站,用润滑油对轴进行冷却,以延长该反应器稳定运行时间。     

锅炉引风机轴承箱密封失效的原因分析及改造

简述锅炉引风机轴承润滑与密封改造实例,分析改造前轴承箱密封失效的原因,介绍一种简便易行的改造密封的方法。     

芳纶浆粕预处理及在橡胶中的应用研究进展

综述了芳纶浆粕在使用过程中存在的问题及目前的预处理方法,包括表面改性处理和预分散处理方法。其中芳纶浆粕的表面改性处理可以采用超声波法、接枝改性、偶联改性、聚合物涂层改性等,预分散处理可以通过浆粕母胶法、粉体隔离法等。同时综述了芳纶浆粕在橡胶中的应用,主要集中在密封橡胶、隔热橡胶以及承载橡胶中。     

纳米粒子填充PTFE摩擦副材料的研究进展

综述国内外纳米粒子填充聚四氟乙烯(PTFE)摩擦副材料的研究进展,对纳米粒子填充后的减摩抗磨机理进行探讨,提出“滚珠轴承”、膜润滑和界面束缚作用三个观点,分析该项研究在纳米粒子分散技术和纳米粒子与PTFE基体界面处理上存在的不足,并结合复合材料界面处理机理、PTFE表面粘结机理和纳米粒子分散机理,提出一些新的纳米粒子填充PTFE复合材料界面改性和分散技术的方法。     

螺杆压缩机干气密封的改造

分析了聚酯厂螺杆压缩机运行的主要故障,细述了螺杆压缩机干气密封改造的原理、结构、控制系统、密封面受力分析和优点。干气密封改造后,润滑油不再被污染,压缩机的轴承,增速齿轮和同步齿轮润滑良好,使用周期大大延长。     

Microwave-assisted urea-modified sorghum biomass for Cr (III) elimination from aqueous solutions

The present study concentrated on the use of an agro-waste biodegradable sorghum biomass in its simple and modified forms for the binding of Cr (III) ions. A relatively new method of modification was adopted using urea under microwave irradiation. FTIR analysis showed the presence of oxygen and nitrogen bearing functional groups in unmodified (UMS) and modified (MS) sorghum biomass. The appearance of new bands and shifts in the peaks confirmed the modification. The influence of different process parameters such as the adsorbent dose, solution pH, contact time, agitation speed and initial metal ion concentration was studied thoroughly to evaluate optimum conditions for adsorption. Maximum adsorption for Cr (III) ions occurred at pH 5.0–6.0 using UMS and MS. Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models in a non-linear fashion were used to explain the phenomenon. Maximum adsorption capacity was 7.03 and 16.36 mg of Cr (III) per gram of UMS and MS, respectively. Adsorption mechanism was explored by pseudo-first- and pseudo-second-order kinetic models, and it was found that the process followed pseudo-second-order kinetics. Thermodynamic study indicated the process favorability. The study concluded that urea modification under microwave irradiation produces a non-toxic and more effective adsorbent for Cr (III) remediation by inducing new nitrogen bearing functional groups to sorghum biomass.     

Graft copolymerization of vinyl monomers on modified cotton. IV. Ceric-induced grafting on vinyl monomers on cellulose bearing different substituents

The influence of introducing various functional groups into the cellulose molecule on its susceptibility toward grafting with vinyl monomers such as acrylonitrile and methyl methacrylate using the Ce(IV)–cellulose redox system was studied. While cellulose bearing either cyanoethyl or carboxymethyl groups showed higher graft yields, cellulose bearing both groups showed lower yields. Presence of acrylamidomethyl groups in the cellulose molecule reduced its reactivity to grafting. The same holds true for cellulose bearing acrylamidomethyl groups along with carboxymethyl groups. On the other hand, introducing carbamoylethyl groups in the cellulose molecule enhances significantly the susceptibility of cellulose toward grafting. This is also observed with cellulose bearing cyanoethyl and carboxyethyl groups. Treating cellulose with N-methylolacrylamide in alkaline medium seems to produce a crosslinked cellulose with lower reactivity to grafting. The results obtained with the different substrates were discussed on the basis of the change in the physical and/or chemical structure of cellulose brought about during its modification as well as on the nature of the substituent groups introduced. The mode of Ce(IV) attack on cellulose was also clarified.     

Synthesis and characterization of ionomers based on telechelic phosphonic polyether or aromatic polyesters

A new method to prepare ionomers bearing terminal ionic groups has been developed by modification of different hydroxyl terminated oligomers and using vinyl phosphonic acid as reagent. The different oligomers have been characterized by NMR, MALDI-TOF, SAXS, SEM-EDX, thermal analysis and their ionic crosslinking was achieved using different cations. Characterization of the network was performed and proved that an efficacious crosslinking was reached depending on the nature of the cations.     

轴流式强制循环泵的国产化改造

针对烧碱蒸发装置中强制循环泵存在的问题进行了技术改造,包括优化机械密封结构、优化主轴结构、改进轴承润滑方式。改造达到了预期效果。     

饲料级磷酸氢钙装置打散系统优化改造

针对磷酸氢钙产品干燥过程中粉体解聚打散机存在设备跳停、皮带易烧坏、轴承易损坏等问题,采取改造打散机结构、增加一级二级粉碎机、使用高温润滑油、增设水冷系统和变频器等措施进行优化改造。改造后年运行率提升到98%,每班产量由50 t增加到100 t左右。