管式螺旋喂料机结构的改进

１．引言管式螺旋喂料机被广泛地应用于水泥厂和粉磨站中粉状物料的供料。其主要作用是与稳料仓配合作用,使不均匀料流变成连续稳定的料流,从而保证下道计量装置连续均匀,准确地计量。２．管式螺旋喂料机存在的问题及原因分析管式螺喂料机在输送流动性很大的细粉料时,...     

新型燃烧器送煤装置的应用

在水泥生产过程中,煤粉燃烧器是水泥厂煅烧水泥熟料的重要热工设备,燃烧器对尾部的送煤管道要求很高,其使用性能的稳定性及使用寿命的长短直接影响烧成系统热工制度的稳定、回转窑技术性能指标的实现和水泥熟料的产量和质量。在使用过程中为了有效防止回转窑结圈,必须采用煤粉燃烧器间隔性的实时移动的工艺,在这种情况下,既要有效防止结圈,又要达到稳定可靠连续地生产,对送煤管道提出了更高的要求。     

A novel type hypertriglyceridemia observed in FLS mice

The unique inborn hypertriglyceridemia seen in FLS (fatty liver Shionogi) mice was relieved by the administration of purified apolipoprotein (apo) C-II. Lipoprotein lipase (LPL) and its cofactor, apoC-II, play a pivotal role in VLDL metabolism. Therefore, we investigated the genetic background involved in this hypertriglyceridemia. Plasma levels of TG and total cholesterol as well as LPL activity were measured in male FLS mice and C57/BL6J mice. Agarose gel electrophoresis and fast protein liquid chromatography were used to analyze the lipoprotein profile. A cross experiment was done to determine the genetic background of hypertriglyceridemia observed in FLS mice. cDNA sequences of apoC-II and apoC-III of FLS mice were determined. Preα-lipoprotein was the predominant lipoprotein class in FLS mouse plasma. LPL activity remained in the range observed in C57/BL6J mice, and purified apoC-II transiently relieved FLS mice from hypertriglyceridemia. Preα-lipoproteinemia was inherited in an autosomal recessive manner. ApoC-III appeared to be a causal factor for this unique hypertriglyceridemia. Microsatellite analysis, however, revealed that the responsible chromosome was not 7; rather, apoC-III mapped onto chromosome 9. Therefore, we suggest apoC-III as a candidate causative factor for the hypertriglyceridemia observed in FLS mice because an excessive amount of apoC-III attenuates LPL activity in vivo and in vitro.     

Measurement technique on the diffusion coefficient of powder flow in a screw feeder by X-ray visualization

Measuring the diffusion coefficient of powder flow, which shows the magnitude of mixing, using X-ray visualization has been developed with the help of image processing techniques. Injecting minute metallic tracers into the powder yielded flow characteristics using the X-ray penetration images. The diffusion coefficient of the flow was determined by tracer figure deformation with time. Using this method, we evaluated four kinds of powder flows transported using different shaped screws in a screw feeder unit. The following results were obtained from this investigation: (i) Increasing the pitch width of the screw yielded decreased transport velocity and a larger diffusion coefficient. (ii) Double screw provided the largest transport velocity and the smallest diffusion coefficient.In addition, uncertainty analysis was applied to the method of measuring the diffusion coefficient to achieve greater bias limit.     

侧式刮板取料机防偏轮的改进

我公司生料配料取料采用CGQ150/22.5侧式刮板取料机,在取料机行进过程中,为保证大车行走前后轮水平同步,在两个主驱动轮内侧,分别设置了两对防偏轮,固定在轨道两侧.在使用中经常出现因防偏轮轴承损坏,使大车行走前后轮发生歪斜,导致取料机行进过程中跳停,必须在回车后,将前后轮重新调正后,才能再次取料.致使取料时间延长,...     

A novel foam combustion approach for the synthesis of nano-crystalline cobalt oxide powder

This article focuses on the nano-crystalline tricobalt tetraoxide (Co₃O₄) synthesis using the combustion method. The fabrication process involves the combustion a mixture of cobalt nitrate as oxidized and expanded polystyrene (EPS) as a novel fuel. The effects of fuel/oxidizer ratio on the phases formed, Co₃O₄ as a major phase and CoO as an impurity, and the Co₃O₄ crystallite size have been addressed. Based on the thermal analyses data (TGA and DTA), which follow the phase changes during the heat treatment of the parent fuel/oxidizer precursor, the different parent precursors have been calcined at 500?°C. Characterization of the formed solids has been performed using various tools (XRD, FT-IR, SEM, TEM, and XPS). It was concluded that the EPS content, in the combustion precursor mixtures, is a key parameter that controls the phase features of the prepared nanomaterials. CoO impurity was detected for the solids with EPS?>?4?wt%. The crystallite size, morphology, and the surface elemental concentration are influenced by changing the EPS content. The activity of the different powders towards hydrogen peroxide decomposition has been evaluated at the 35–50?°C temperature range.