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尿素装置的吸收塔循环泵因环保问题改用国产CQB型磁力泵后,达到了完全无泄漏,满足了环保要求,但其轴承使用寿命短,并由此引发其他内件损坏,导致该泵运行周期短,备件更换频繁。对轴承容易损坏的原因进行分析,在轴承选材及安装尺寸上做了一些调整,改进后的轴承使用寿命在一年左右,保证了设备的长周期运行。 相似文献
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离心式尿素溶液泵机械密封失效原因分析及对策 总被引:1,自引:0,他引:1
尿基复合肥采用的离心式尿素溶液泵,因其机械密封使用寿命短,并由此引发其他内件损坏,导致该泵运行周期短,备件更换频繁。对机械密封失效形式及原因进行分析,并提出相应对策,在机械密封选材(动静环材质由碳化硅改为镍基硬质合金)及安装尺寸上做了一些调整。改进后的机械密封使用寿命提高(检修周期达半年),保证了设备的长周期运行。 相似文献
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备品备件投资在以往的项目经济评价中常常被忽略。但是,当建设投资中备品备件数额较大时,它会影响项目评价的准确性。分析了不同情况下备品备件的组成,提出了在项目评价中可以采用的三种处理方法:计入固定资产原值,冲减生产成本,转作流动资金。 相似文献
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结合聚氯乙烯生产装置,分析了影响备件库存的众多因素,并对各影响因素进行分级,提出了一个简单实用的数学计算式,用来计算反映备件库存必要性程度的备件库存必要性因子.该因子的应用有助于提高企业的备件库存管理水平,降低企业综合成本. 相似文献
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作为机动设备和车辆零部件,刹车制动部件是机动设备与车辆最主要的安全部件之一。提高安全性能、减少环境污染和噪音污染、延长使用寿命应该是摩擦材料发展的大趋势。在很多车用制动摩擦材料中,陶瓷刹车片凸显优势,它是摩擦材料中的一个有潜力的新品种,具有明显的性能优势而极具市场前景。针对车用陶瓷材料的市场商机,介绍了汽车制动器摩擦材料的发展变迁,阐述了车用陶瓷及刹车材料的产品结构及应用范围,研究了陶瓷刹车片使用中的性能特征;同时指出了车用陶瓷及刹车材料的研发和未来前景。 相似文献
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通过对年产18万t PET装置上使用的带切断阀的椭圆齿轮流量计的原理分析,提出并解决了由于供电模块故障导致流量计不能使用的问题。所设计的新供电方案避免了采购原装备件周期长、费用高,影响生产的问题,为进口设备备件国产化做了有益的尝试。 相似文献
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The pseudo strain-hardening behavior of Engineered Cementitious Composites (ECC) is a desirable characteristic for it to replace concrete to suppress brittle failure. This widespread use of ECC in the industry is, however, limited by its high cost. To achieve higher performance/cost, ECC can be strategically applied in parts of a structure that is under relatively high stress and strain. In this paper, layered ECC-concrete beams subjected to static and fatigue flexural loads were investigated by experiments. The static test results showed that the application of a layer of ECC on the tensile side of a flexural beam increased its flexural strength and the degree of improvement increased with the thickness of ECC applied. In addition, the layer of ECC enhanced the ductility of the beam and the failure mode changed from brittle to ductile. Under four-point cyclic loading, the ECC layer significantly improved the fatigue life of the beam. Moreover, in comparison to plain concrete beams, layered ECC beams could sustain fatigue loading at a larger deflection without failure. The great improvement in fatigue performance was attributed to the effectiveness of ECC in controlling the growth of small cracks. The experimental findings reflect the feasibility of using ECC strategically in critical locations for the control of fatigue crack growth. 相似文献
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P. G. Pristupa 《Refractories and Industrial Ceramics》1973,14(5-6):353-357
Conclusions To reduce expenditure on acquiring and making spare parts and units and substantially reduce their consumption it is necessary to carry out more work on the standardization of components, replacing equipment and technical plant both in enterprises and in the industry as a whole. In all enterprises we should compile catalogs of components and equipment units, and determine the minimal required permanent stocks. Over a period of one to two years it will be necessary to carry out the complete centralization of the stocks of spare parts and guarantee their accountancy of consumption. To obtain a return of not less than 35–40% worn-out components for restoration and not less than 40–50% newly produced spare parts it will be necessary to subject them to strengthening by various techniques.Translated from Ogneupory, No. 6, pp. 23–27, June, 1973. 相似文献