针对磁化焙烧后的氧化反应过程开展了研究,利用TGA、SEM检测技术对酒钢选矿厂综合尾矿磁化焙烧产品的氧化过程反应机制进行分析,并结合模型匹配法对氧化动力学参数进行求解。结果表明:磁化焙烧产品在氧化过程中,适当地增加氧化反应的温...针对磁化焙烧后的氧化反应过程开展了研究,利用TGA、SEM检测技术对酒钢选矿厂综合尾矿磁化焙烧产品的氧化过程反应机制进行分析,并结合模型匹配法对氧化动力学参数进行求解。结果表明:磁化焙烧产品在氧化过程中,适当地增加氧化反应的温度,可以明显加快氧化反应的速率,减少磁化焙烧产品被氧化所需的时间,但过高的温度会导致磁化焙烧产品过氧化。氧化反应动力学的最佳机理函数为二维扩散模型(Valensi)G(α)=α+(1-α)ln(1-α),其表观活化能E为5.16 k J/mol,指前因子A为14.73 min^(-1)。磁化焙烧产品中的微裂纹可为O_(2)气体提供向内扩散的通道,其氧化过程的反应限制环节为O_(2)气体在颗粒表面及缝隙表面的二维扩散。展开更多
达赫(Dahej)港位于南亚印度次大陆西海岸坎帕德湾(Gulf of Khambhat,又名Cambay(坎贝湾))北部,港口代码INDAH,地理位置为(21°42'.0N,072°30'.5E),是印度古吉拉特邦苏拉特(Surat)市的港口,在孟买以北约210 n mile,主...达赫(Dahej)港位于南亚印度次大陆西海岸坎帕德湾(Gulf of Khambhat,又名Cambay(坎贝湾))北部,港口代码INDAH,地理位置为(21°42'.0N,072°30'.5E),是印度古吉拉特邦苏拉特(Surat)市的港口,在孟买以北约210 n mile,主要装卸散杂货、干散货、石化产品、LPG和LNG等。达赫港有2点特别之处:(1)潮差大,极值可达11 m以上,给船舶航行、锚泊和靠泊作业带来困扰;(2)进出港口时经过的坎帕德湾为自然航道,浅滩密布、水深多变、灯浮变动频繁、海图水深更新不及时,容易导致船舶搁浅。展开更多
The dynamic responses of a floating vertical axis wind turbine(VAWT)are assessed on the basis of an aero-hydro-mooring coupled model.The aerodynamic loads on the rotor are acquired with double-multiple stream tube met...The dynamic responses of a floating vertical axis wind turbine(VAWT)are assessed on the basis of an aero-hydro-mooring coupled model.The aerodynamic loads on the rotor are acquired with double-multiple stream tube method.First-and second-order wave loads are calculated on the basis of 3D potential theory.The mooring loads are simulated by catenary theory.The coupled model is established,and a numerical code is programmed to investigate the dynamic response of the semi-submersible VAWT.A model test is then conducted,and the numerical code is validated considering the hydrodynamic performance of the floating buoy.The responses of the floating VAWT are studied through the numerical simulation under the sea states of wind and regular/irregular waves.The effects of the second-order wave force on the motions are also investigated.Results show that the slow-drift responses in surge and pitch motions are significantly excited by the second-order wave forces.Furthermore,the effect of foundation motion on aerodynamic loads is examined.The normal and tangential forces of the blades demonstrate a slight increase due to the coupling effect between the buoy motion and the aerodynamic loads.展开更多
文摘针对磁化焙烧后的氧化反应过程开展了研究,利用TGA、SEM检测技术对酒钢选矿厂综合尾矿磁化焙烧产品的氧化过程反应机制进行分析,并结合模型匹配法对氧化动力学参数进行求解。结果表明:磁化焙烧产品在氧化过程中,适当地增加氧化反应的温度,可以明显加快氧化反应的速率,减少磁化焙烧产品被氧化所需的时间,但过高的温度会导致磁化焙烧产品过氧化。氧化反应动力学的最佳机理函数为二维扩散模型(Valensi)G(α)=α+(1-α)ln(1-α),其表观活化能E为5.16 k J/mol,指前因子A为14.73 min^(-1)。磁化焙烧产品中的微裂纹可为O_(2)气体提供向内扩散的通道,其氧化过程的反应限制环节为O_(2)气体在颗粒表面及缝隙表面的二维扩散。
文摘达赫(Dahej)港位于南亚印度次大陆西海岸坎帕德湾(Gulf of Khambhat,又名Cambay(坎贝湾))北部,港口代码INDAH,地理位置为(21°42'.0N,072°30'.5E),是印度古吉拉特邦苏拉特(Surat)市的港口,在孟买以北约210 n mile,主要装卸散杂货、干散货、石化产品、LPG和LNG等。达赫港有2点特别之处:(1)潮差大,极值可达11 m以上,给船舶航行、锚泊和靠泊作业带来困扰;(2)进出港口时经过的坎帕德湾为自然航道,浅滩密布、水深多变、灯浮变动频繁、海图水深更新不及时,容易导致船舶搁浅。
基金The study is supported by the National Natural Science Foundation of China(No.51879190)the Tianjin Research Innovation Project for Postgraduate Students(No.2021YJSB185).
文摘The dynamic responses of a floating vertical axis wind turbine(VAWT)are assessed on the basis of an aero-hydro-mooring coupled model.The aerodynamic loads on the rotor are acquired with double-multiple stream tube method.First-and second-order wave loads are calculated on the basis of 3D potential theory.The mooring loads are simulated by catenary theory.The coupled model is established,and a numerical code is programmed to investigate the dynamic response of the semi-submersible VAWT.A model test is then conducted,and the numerical code is validated considering the hydrodynamic performance of the floating buoy.The responses of the floating VAWT are studied through the numerical simulation under the sea states of wind and regular/irregular waves.The effects of the second-order wave force on the motions are also investigated.Results show that the slow-drift responses in surge and pitch motions are significantly excited by the second-order wave forces.Furthermore,the effect of foundation motion on aerodynamic loads is examined.The normal and tangential forces of the blades demonstrate a slight increase due to the coupling effect between the buoy motion and the aerodynamic loads.
