下排气方形旋风分离器结构优化及其分离特性的试验研究

对可与循环流化床水冷壁直接结合而易于布置的下排气方形旋风分离器的性能指标：分离效率、压降等进行了研究。为了获得最佳的结构，对不同的结构方案进行了优化试验。结果表明，采用锥形缩口排气管的下排方形气旋风分离器具有结构简单、高效率低阻等优点，有利于实现循环流化床锅炉的大型化。

Preparation of solid medium for use in separation with gas-solid fluidized beds

The highly-efficient dry separation technique using a gas-solid fluidized bed is very beneficial for increasing coal grade and optimizing the utilization of coal resources.The size distribution of the solid medium(e.g.,magnetite powder) used in this technique is one of key factors that influences fluidization and separation performance.It is,therefore,urgent to prepare medium in a way that operates at low cost and high efficiency.Grinding experiments were performed using a planetary ball mill equipped with a frequency converter.The effect of fed mass,rotation frequency of the mill,grinding time and the ball-size ratio on grinding performance was investigated.The grinding parameters were optimized by numerical calculations using Artificial Neural Network(ANN) in Matlab.A regression equation for predicting the yield of the desired product(i.e.,0.3～0.15 mm magnetite powder) is proposed.The maximum yield of 0.3～0.15 mm particles was 47.24%.This lays a foundation for the industrial-scale production of the solid medium required for separation with a magnetite-powder fluidized bed.

黑龙江中俄边境口岸全沟硬蜱中分离到人巴贝西原虫

〔目的〕了解中俄边境口岸人巴贝西原虫在蜱体内的感染携带情况及病原基因特征,以便采取必要的防控措施。〔方法〕用从黑龙江中俄边境口岸采集到的全沟硬蜱叮咬清洁级的SCID小鼠,而后,利用微气固相分离技术从被叮咬的SCID小鼠中分离人巴贝西原虫。〔结果〕涂片观察可见血细胞内呈现典型的四分体和环状体。离体培养血细胞中亦观察到人巴贝西原虫的生长。核糖体小亚基的基因序列分析表明,新分离到的人巴贝西原虫是微小巴贝西原虫,与密山株和日本神户株具有高度同源性。本批样本中,雌性全沟硬蜱的感染率为2.7%～4.0%。〔结论〕中俄边境口岸存在人巴贝西原虫的自然疫源地,存在人感染的风险,检验检疫部门应采取必要的防范措施,防止巴贝西原虫病传入传出。