消火栓水枪喷嘴水力计算方法的简化

针对目前消火栓喷嘴水力计算采用试算及图表法所存在的问题,通过对原求解函数的优化拟合,推导出可直接计算的解析式,便于基层设计人员在实际工程设计中应用。对该解析式计算精度的分析表明,在常用参数范围内,最大拟合误差仅为1.49%,满足现行规范要求。     

激光重熔等离子喷涂Al2O3陶瓷层的相转变

研究了锌铝基Al2O3陶瓷层激光重熔区内陶瓷相的转变。采用METCO 4MP等离子喷涂机对基体材料表面喷涂氧化铝(Al2O3的质量分数为99％)陶瓷层。采用上海光学精密机械研究所HJ-4工业用横流CO2激光器进行激光重熔。通过X射线衍射分析和透射电镜对Al2O3陶瓷的微观结构、成分和分布的研究，得到以下结论：在等离子喷涂过程中，喷涂层中陶瓷相发生。α-Al2O3→γ-Al2O3 α-Al2O3的转变。激光重熔后，试样表层的原α-Al2O3陶瓷相、γ-Al2O3陶瓷相均转变为δ-Al2O3陶瓷相，为体心四方结构．熔池区陶瓷相主要分布在表层，次表层和过渡区。     

规整填料在铜洗塔中的应用研究

本文研究了铜洗液脱除合成气中少量ＣＯ、ＣＯ２的反应和传质吸收机理。分析了铜洗塔中应用高效规整填料所具有的技术优势，以及在设计改造中应注意的关键问题。模拟结果和应用效果表明，采用高效填料塔技术是合成氨装置扩大生产能力、提高合成气质量、降低成本的重要措施。     

Study of Hydrodynamics,Mixing and Gas‐Liquid Mass Transfer in a Split‐Rectangular Airlift Reactor

Global hydrodynamic characteristics, liquid mixing and gas‐liquid mass transfer for a 63 L split‐rectangular airlift reactor were studied. Correlations for gas holdup and overall liquid circulation velocity were derived for the air‐water system as a function of the specific power input; these were compared to data and correlations for reactor volumes between 4.7 L and 4600 L. A partial recirculation of small bubbles in the riser was observed when U_gr > 0.03 m/s, which was attributed to the use of a single‐orifice nozzle as the gas phase distributor. The dimensionless mixing time and the overall axial dispersion coefficient were nearly constant for the range of gas flow rates studied. However, values of K_L/d_B were greater than those reported in previous studies and this is caused by the partial recirculation of the gas phase in the riser. While scale effects remain slight, the use of a gas distributor favouring this partial recirculation seems adequate for mass transfer in split‐rectangular airlift reactors.     

纳米陶瓷热喷涂若干问题的试验研究

就制备Al2O3-3TiO2纳米陶瓷涂层的热喷涂系统热源，焰流速度和纳米陶瓷棒进行了试验研究，提出了采用低温、高速、强力、纳米陶瓷棒制备纳米陶瓷涂层的热喷涂工艺。     

煤气初冷器喷洒洗萘工艺的改进

针对初冷器喷洒洗萘存在的堵塞和阻力大等问题，相应采取了改进工艺和调整操作参数等措施，即确保了出厂煤气的质量，又提高了生产的安全性。     

Structures and tribological performances of PEEK (poly-ether-ether-ketone)-based coatings designed for tribological application

Driven by economical and ecological reasons, thermoplastic-based coatings become a potential solution for anti-wear purpose. Two coating design concepts, flame spraying and printing PEEK (poly-ether-ether-ketone)-based coatings on Al substrate, were introduced in this paper. An amorphous PEEK coating was obtained by these two techniques. After being annealed, the coating presents a semi-crystalline structure. The friction and wear behaviors of PEEK-based coatings were investigated by means of ball-on-disc tests. The results show that PEEK coatings exhibit an excellent tribological performance with a relatively low coefficient of friction and wear rate. The semi-crystalline PEEK coating exhibits a lower friction coefficient and wear rate than the amorphous one. The additions of micron-sized particles such as SiC and graphite in PEEK coating can improve significantly the coating wear resistance.     

静电喷涂技术

本文介绍了静电喷涂的原理，静电喷涂设备和用途，操作工艺、应用效果及注意事项。     

不同因素对浸入式水口预热温度场的影响

运用大型有限元分析软件ANSYS的FLO TRANCFD模块对浸入式水口在抽风式预热烘烤方式下的瞬态传热过程及影响水口预热温度场的各种因素进行了研究 ,得到了该烘烤方式下水口预热后的温度场分布和水口的升温曲线。研究结果表明 :影响水口预热温度的最主要因素是抽风流量和烘烤箱的几何尺寸 ;适当提高抽风流量、减小烘烤箱的几何尺寸可以大大提高水口颈部的预热温度 ,从而降低浸入式水口的事故率     

用对流磨粉碎石灰石的试验研究

本文扼要介绍了对流磨的结构与粉碎原理，及粉碎石灰石的试验研究。研究的主要内容是给料粒度与粉碎产物细度和能量效率的关系，以及喷嘴形状与能量效率的关系。