Methods for the characterization of mould slag crystallization with special emphasis on the single/double hot thermocouple technique(SHTT/DHTT)are reviewed.In the continuous casting process of steels,horizontal heat t...Methods for the characterization of mould slag crystallization with special emphasis on the single/double hot thermocouple technique(SHTT/DHTT)are reviewed.In the continuous casting process of steels,horizontal heat transfer is mainly influenced by the crystallization behaviour of the mould flux film.Here,both precipitation of crystals out of a liquid phase and devitrification of the glassy film in contact with the mould are of main interest.Therefore,various investigation methods are implemented to characterize different slag properties related to crystallization:a viscometer for determining the break temperature,differential thermal analysis(DTA),confocal scanning laser microscopy,and the water-cooled copper finger test.For near-service conditions,DHTT reveals the most detailed information,including not only the crystallization or devitrification temperature but also the morphology as well as the crystallization velocity.Due to improvements in the device and the representation of the results,a comparison of different samples is possible.Nevertheless,the application field of SHTT/DHTT is restricted to slag systems with low contents of evaporating components.Furthermore,the time required for data analysis is significantly longer than that required for other methods,e.g.DTA.Therefore,the application of DHTT is mainly advisable for mould slag research and development,whereas DTA can also be used for incoming inspections.展开更多
针对目前环模压块机存在生产率低、能耗高等问题,该文采用立式环模原理和双层孔环模结构,创新设计了双层孔模块及对应的压辊,双层环模模块两边线夹角8°,模孔偏心角4.3°,双模孔中心线夹角10°。样机完成后进行了生产性试验...针对目前环模压块机存在生产率低、能耗高等问题,该文采用立式环模原理和双层孔环模结构,创新设计了双层孔模块及对应的压辊,双层环模模块两边线夹角8°,模孔偏心角4.3°,双模孔中心线夹角10°。样机完成后进行了生产性试验,结果表明:压块机生产率为2.39 t/h,吨料能耗55.86 k W·h/t,成型率为96%以上,成型密度为1.1 g/cm3以上,各项指标均达到设计及标准要求;对比于单层环模的立式环模生物质成型机生产参数,该创新设计的设备性能有所提高;设备自身下层环模与上层环模相比,成型率、生产率均有提高,差异不大。该立式双层环模压块机提高了生产率和产品质量,为中国生物质成型燃料产业化的发展提供装备保障。展开更多
文摘Methods for the characterization of mould slag crystallization with special emphasis on the single/double hot thermocouple technique(SHTT/DHTT)are reviewed.In the continuous casting process of steels,horizontal heat transfer is mainly influenced by the crystallization behaviour of the mould flux film.Here,both precipitation of crystals out of a liquid phase and devitrification of the glassy film in contact with the mould are of main interest.Therefore,various investigation methods are implemented to characterize different slag properties related to crystallization:a viscometer for determining the break temperature,differential thermal analysis(DTA),confocal scanning laser microscopy,and the water-cooled copper finger test.For near-service conditions,DHTT reveals the most detailed information,including not only the crystallization or devitrification temperature but also the morphology as well as the crystallization velocity.Due to improvements in the device and the representation of the results,a comparison of different samples is possible.Nevertheless,the application field of SHTT/DHTT is restricted to slag systems with low contents of evaporating components.Furthermore,the time required for data analysis is significantly longer than that required for other methods,e.g.DTA.Therefore,the application of DHTT is mainly advisable for mould slag research and development,whereas DTA can also be used for incoming inspections.
文摘针对目前环模压块机存在生产率低、能耗高等问题,该文采用立式环模原理和双层孔环模结构,创新设计了双层孔模块及对应的压辊,双层环模模块两边线夹角8°,模孔偏心角4.3°,双模孔中心线夹角10°。样机完成后进行了生产性试验,结果表明:压块机生产率为2.39 t/h,吨料能耗55.86 k W·h/t,成型率为96%以上,成型密度为1.1 g/cm3以上,各项指标均达到设计及标准要求;对比于单层环模的立式环模生物质成型机生产参数,该创新设计的设备性能有所提高;设备自身下层环模与上层环模相比,成型率、生产率均有提高,差异不大。该立式双层环模压块机提高了生产率和产品质量,为中国生物质成型燃料产业化的发展提供装备保障。
