Operation optimization of concentrate burner in copper flash smelting furnace

The software that simulates the flow, temperature, concentration and the heat generation field in the Outkumpu flash smelting furnace, was developed by a numerical method of the particle-gas flow together with some chemical reaction models. Many typical operating conditions were chosen for simulation in order to obtain the effect of the distribution air, process air, central oxygen and the oil-burner position etc. The concepts about optimum op-eration, 3C(concentration of high temperature, high oxygen and laden concentrate particles), are concluded from these simulated results, which have been checked primarily by operational experiments.     

副保险杠翻边冲孔模的设计与改进

介绍了副保险杠翻边冲孔模的设计要点,同时通过改进结构,使模具的装配和调整变得简便。     

三种湍流模型对Al电解槽内Al液流场预测的比较及其工业测试

应用标准k-Е双方程、低Reynolds数Jones-Launder k-Е模型与RNG k-Е模型分别对三种不同进电方式(四点进电的200kA槽、两点进电的160kA槽以及三点进电的80kA槽)的预焙阳极Al电解槽内的Al液流场进行了数值仿真，并且应用铁棒溶蚀法对相应工况下的Al液流场进行了工业测试。通过对计算结果和测试结果的比较与分析，可以得出：与标准k-Е模型相比较，低Reynolds数模型具有较小的湍流粘度；标准k-Е模型与RNG模型用于Al液流场的数值仿真时，其计算结果均有较高的可靠性。并初步得出在电流强度大于80kA的Al电解槽中，Al液流动的计算不适宜应用低Reynolds数模型。     

小直径钢管内孔等离子弧焊接新方法

所研制的内孔等离子弧焊枪,可以得到与焊枪轴线成任意角度的等离子弧。它为设计制造小型等离子弧焊枪提供了一条新的途径。作者(?)使用该焊枪对内径大于12mm 的管子,成功地进行了内孔对接焊和内孔角接焊.焊接接头质量良好.内孔等离子弧焊接具有钨极寿命长、氩气耗量少等优点,是内孔焊的一种更经济的新方法。     

抗菌功能性铝基材料的制备及表征

通过交流电沉积的方法在铝阳极氧化膜的孔内沉积金属铜,制备了铝基抗菌功能性材料;测试了沉积铜的铝阳极氧化膜的抗菌性能.结果表明:电沉积铜的铝阳极氧化膜对大肠杆菌、绿脓杆菌、粪链球菌和金黄色葡萄球菌的抗菌率均大于95%.透射电子显微镜表征了铜在氧化膜孔内的沉积形貌,铜在铝阳极氧化膜孔内呈连续的线状形貌,直径为25 nm.     

无芯薄壁长矩形管弯曲模设计

介绍了避免无填料和衬芯的长矩形管弯曲成形后管壁出现内陷及折痕的工艺,模具结构特点及设计中注意的事项,模具结构合理,便于加工、装配及使用。对该类工件的弯曲成形有一定的参考价值。     

Hydrogen embrittlement susceptibility and permeability of two ultra-high strength steels

Slow displacement rate tensile tests were carried out in a saturated H₂S solution to investigate the effect of hydrogen embrittlement on notched tensile strength (NTS) and fracture characteristics of two ultra-high strength steels (PH 13-8 Mo stainless steel and T-200 maraging steel). Hydrogen permeation properties were determined by an electrochemical permeation method. The results of permeation tests indicated that over-aged specimens showed a lower diffusivity/hydrogen flux and higher solubility than those solution-annealed. The great increase in reverted austenite (irreversible hydrogen traps) together with numerous precipitates at the expense of dislocations (reversible) in the over-aged specimen led to such a change in permeability. Ordinary tensile tests indicated that four tested specimens had roughly the same yield strength level. Hence, the hydrogen embrittlement susceptibility of the material could be related to their permeation properties. The uniform distribution of strong hydrogen traps in over-aged specimens instead of weak traps in the solution-annealed impeded the hydrogen transport toward the strained region, thus, the resistance to sulfide stress corrosion cracking was improved in over-aged specimens.     

双动压力机多杆机构的计算机辅助运动分析

运用连杆机构分析的基本组法，开发了双动压力机多样机构计算机辅助分析的通用程序包，对于不同形式的多杆机构，通过其主程序与此程序包联结，可方便有效地完成机构运动的分析计算和动态模拟，并且给出了实例说明。     

无线体域网高能效竞争接入机制研究

低能耗是无线体域网WBAN通信最重要的指标.构建了IEEE 802.15.6无线体域网CSMA/CA竞争接入的功耗模型,分析了用户优先级、MAC帧负荷尺寸和数据到达量对信道接入能耗的影响,提出了一种通过数据汇聚传输提高能量效率的增强型信道接入方法.仿真结果表明,在低业务量及混合业务场景下,所提方法能够显著减少信道接入的能量消耗.