Influence of simulating deep-sea environmental factors on cathodic performance of seawater battery

A metal-dissolved oxygen seawater battery(SWB)uses metal and dissolved oxygen as the reactants,and it is ideal for use as a long-time low-power distributed power supply in deep sea,due to its advantages of open structure in service without electrolyte.However,several simulating deep-sea environmental factors,such as flow rate,dissolved oxygen concentration,and temperature of seawater may af fect the oxygen reduction reaction(ORR)rate and the stability of electrochemically modified polyacrylonitrile-based carbon fiber brush(MPAN-CFB)cathode,which was studied by steady-state polarization and galvanostatic discharge methods.In addition,the scales formed on MPAN-CFB surface were characterized by SEM and XRD.Results show that the ORR rate increased quickly with the increase of the seawater flow rate up to 3 cm/s,and then gradually stabilized.Moreover,the ORR rate was largely af fected by dissolved oxygen concentration,and the concentration of>3 mg/L was favorable.Compared with surface layer temperature of 15℃,the low temperature of deep sea(4℃)has a negligible ef fect on ORR rate.When the working current is too high,it will lead to the formation of CaCO_3 scales(aragonite)of at the cathodic surface,resulting in the decrease of ORR rate,and consequently the damage to the long-time stability of MPAN-CFB.

深海网箱网衣清洗系统设计研究

为解决深海网箱养殖时网衣易被附着物堵塞问题,研究设计了一种深海网箱网衣水下清洗系统,给出了系统的机械结构组成,水下清洗原理,电控系统和起重机的控制油路设计过程。根据给定的设计条件,对清洗系统的主要动力参数进行了理论分析和计算,结果表明:只要选用的参数配置合理,可完全满足设计要求,为该装置的进一步结构优化和海上试验提供了理论依据。

非金属刷式封严泄漏特性试验与仿真研究

以碳基纤维材料为刷丝制备一种新型非金属刷式封严,搭建专门装置评估该刷式封严的封严性能和流动特性;采用多孔介质模型模拟刷丝束区域,并仿真计算获取该封严的泄漏和内部流动特性。试验与仿真研究均表明,压差增加导致泄漏增加,转速对泄漏影响不明显;仿真计算结果表明,压差主要发生在刷丝束区域,压差越大,后腔射流形成的旋涡强度越大;耐久性试验表明,经初始磨合过后,刷式封严性能较稳定,满足封严要求,但经更长时间的耐久性试验后,碳基纤维刷丝刷式封严性能出现严重下降,表明其耐久性仍有待提高。

浅谈海上钻井平台直流驱动电机用电刷的研制

介绍海上钻井平台直流驱动电机用电刷的研制过程，对如何研制满足海上平台特殊条件用电刷，进行了分析探讨。

海底沉积物层镁阳极化学燃料电池构建及性能研究

研究了一种新型电池结构:海底沉积层镁阳极燃料电池。测试了镁阳极在海底沉积物层的应用性能,研究了组装电池的功率输出,阴、阳极极化性能及长期放电特征。结果表明,电池开路电压1.947 V,电池最大功率密度44.33 mW/cm2,自腐蚀速率(放电电流密度)0.009 mA/cm2,电流密度较大,电位较负,在外接负载条件下长期工作性能稳定。