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本文介绍了两辊压延机由滑动轴承改为滚动轴承辊系的结构设计,进行了轴承的受力分析及轴承基本额定静载荷的校核。改进后降低了生产线故障率,提高了压延制品的尺寸精度,降低了能耗。为同类设备改进提供了经验。 相似文献
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国内外香料香精工业概况与市场分析 总被引:10,自引:1,他引:9
论述了国际香料香精工业发展的现状及趋势。分析并阐明了国际香料香精工业发展的特点。对我国香料香精市场发展的新态势和特点进行了分析,提出了我国目前香料香精工业发展的主要措施与政策建议。论述了我国香料香精工业的生产和市场发展,并对我国香料香精工业发展的前景进行了展望。 相似文献
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论述了目前国内外煤气化反应机理的研究现状,对氧化-还原反应机理进行了阐述,分析了影响气化反应速率的因素。列举了通过实验方法对气化反应活性中间产物进行的研究,指出了碳氧络合物的可能存在形态。进而通过量子化学理论对气化反应机理研究做出了补充,阐述了气化反应进程。最后对煤气化反应机理的进一步研究方向进行了展望。 相似文献
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介绍了双模定型硫化机的适用范围、结构等。总结分析了双模定型硫化机的日常维护保养规程和注意事项。介绍了双模定型硫化机的检修、试车与验收的各项工作。分析了一些检修方法和质量标准。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
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利用组件技术开发化工原理实验课件,给出了系统层、组件库层和应用层的架构划分。重点讨论了组件库的设计,给出了流体阻力这一典型实验的实现描述。实践证实,基于组件技术可以提高仿真实验的开发效率。 相似文献