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煤炭法烘烤罐式煅烧炉 总被引:1,自引:1,他引:0
我国传统的罐式煅烧炉是采用煤气方法烘炉,需投资兴建煤气发生装置,拉入正常运行后基本闲置。文中用煤炭法烘炉实践论证了此法在技术上的可行性,讨论了本法同煤气法烘炉的优缺点以及负压、温度制度的改变对升温曲线的调整。本文还重点介绍了煤炭烘炉所用小炉灶技术 相似文献
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罐式煅烧炉是碳素生产中的关键设备之一,罐式煅烧炉的烘炉又是影响炉体使用寿命和生产操作的重要因素。自50年代起,一直延用硅晶型转化点即α、β、γ的转化点来确定烘炉的保温点,但罐式煅烧炉一般没有五层至八层的火道结构,很难确定准确的晶型转化温度。本文提出了以炉体纵向膨胀量来确定保温点并控制开温速度。 相似文献
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综述了我国罐式炉实现不外加燃料煅烧的基本情况,提出了实现不外加燃料煅烧的理论公式,即挥发份需要量及挥发份生成量与原料中挥发份含量的线性方程,阐述了罐式炉不外加燃料煅烧的理论基础。 相似文献
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摘要:为了研究罐式煅烧炉热工特性,了解罐式炉实际运行状况,需要对其进行全面的热平衡测试。重点介绍了罐式炉热平衡测试平台、热收入项和热支出项的计算方法。结合国内某厂新建罐式煅烧炉的热平衡测试与分析,得到各个具体的生产运行参数,这对评价操作参数合理性,提升对罐式炉的认知和操作水平,以及对罐式炉的生产和管理都具有指导意义。 相似文献
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《International Journal of Refractory Metals and Hard Materials》2012,30(6):674-680
Tool degradation may be significantly different depending on small variations in chemical compositions of the workpiece material. The present study is an in-depth microstructure investigation of worn low content polycrystalline cubic boron nitride tool materials after dry hard turning of steels with low and high sulphur contents. The results illustrate the important role of sulphur content on the degradation of the crater zone. Sulphides tend to adhere on the wear surface and form layers that protect the tool from workpiece ingress. In the absence of sulphides in the workpiece material, no protective layer can form and iron compounds make their way into the tool microstructure already at lower cutting speeds (150 m/min) and preferably attack cBN grains compared to Ti(C,N) grains. 相似文献
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J. Angseryd E. Olsson H.-O. Andrén 《International Journal of Refractory Metals and Hard Materials》2011,29(6):674-680
Tool degradation may be significantly different depending on small variations in chemical compositions of the workpiece material. The present study is an in-depth microstructure investigation of worn low content polycrystalline cubic boron nitride tool materials after dry hard turning of steels with low and high sulphur contents. The results illustrate the important role of sulphur content on the degradation of the crater zone. Sulphides tend to adhere on the wear surface and form layers that protect the tool from workpiece ingress. In the absence of sulphides in the workpiece material, no protective layer can form and iron compounds make their way into the tool microstructure already at lower cutting speeds (150 m/min) and preferably attack cBN grains compared to Ti(C,N) grains. 相似文献
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Iron samples covered with a thin layer of activated carbon have been exposed to humid atmospheres at various relative humidities and with a various sulfur dioxide contents. Contrary to expectation the corrosion is initially faster at 55 and 65% relative humidity that at higher humidities. This phenomenon is attributed to adsorption of water vapour on activated charcoal, so that liquid films giving rise to corrosion can be formed at an earlier stage. After extended exposure, however, no accelerating effect can be attributed to the carbon particles. 相似文献
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To investigate the influence of chromium content on corrosion characteristics of weathering steels, the electrochemical measurements were performed on the steels containing 0–9% Cr (wt.%) in NaHSO3 aqueous solution. The results indicated that the open circuit potential of these steels shifted to the positive direction remarkably, because the additions of Cr improved the passivation capability of the steels. The corrosion current density of the steels containing more than 7% Cr (wt.%) decreased significantly after pre-rusted treatment, implying the corrosion resistance could be enhanced by the formation of protective goethite rust layer. 相似文献
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Guo-jun Zhang Xiao-hui LinGang Liu Na-na ZhangJun Sun 《International Journal of Refractory Metals and Hard Materials》2011,29(1):96-103
Mo-Si alloy sheets with different silicon content were fabricated by powder-metallurgical and thermo-mechanically processing. The effect of Si content and annealing temperature on microstructure and hardness of the Mo-Si alloys were studied by using optical microscopy (OM), transmission electron microscopy (TEM) and Vickers hardness tester, respectively. The results indicated that the presence of Si can effectively refine the grain sizes and improve the hardness of Mo-Si alloys. Si can also increase the recrystallization temperature of alloys and play a significant role in restraining the grain growth at high temperatures. Increasing the annealing temperature, the microstructure of Mo-Si alloy sheets is gradually coarsened and changed from fibrous to equiaxed structure, causing reduction in hardness. The hardening effect in the Mo-Si alloys came from the refined grain strengthening, solid solution strengthening, and second phase particle strengthening, which are closely dependent on the Si content and annealing temperature. 相似文献