An intelligent control method is proposed to improve the performance of power supply for tundish electromagnetic induction heating,which can adequately regulate the tundish temperature.The topology structure of power ...An intelligent control method is proposed to improve the performance of power supply for tundish electromagnetic induction heating,which can adequately regulate the tundish temperature.The topology structure of power supply for tundish electromagnetic induction heating is presented,and its working principle is analyzed.The power supply consists of six power units,and each of them consists of a fore-stage threephase rectifier and back-stage single-phase inverter.The feedforward control DC voltage is used by three-phase rectifier to obtain the stable DC voltage supplied to the inverter.The cloud controller based intelligent temperature control algorithm is combined with the power feed-forward algorithm to obtain accurate tracking of the output current and constant temperature control of the tundish steel in the back-stage inverter.The simulation and experiment are performed to verify the accuracy and effectiveness of the proposed method.展开更多
To improve the properties of low-carbonization of MgO–C refractories,the introduction of composite additives is an effective strategy.Al_(2)O_(3)–SiC composite powder was prepared from clay using electromagnetic ind...To improve the properties of low-carbonization of MgO–C refractories,the introduction of composite additives is an effective strategy.Al_(2)O_(3)–SiC composite powder was prepared from clay using electromagnetic induction heating and carbon embedded methods.Further,the Al_(2)O_(3)–SiC composite powder synthesized by electromagnetic induction heating at 600 A was added into low-carbon MgO–C refractories(4 wt.%)to improve their properties.The results showed that when the addition amount of Al_(2)O_(3)–SiC composite powder is within the range of 2.5–5.0 wt.%,the properties of low-carbon MgO–C samples were significantly improved,e.g.,the apparent porosity of 7.58%–8.04%,the bulk density of 2.98–2.99 g cm-3,the cold compressive strength of 55.72–57.93 MPa,the residual strength after three air quenching at 1100°C of 74.86%–78.04%,and the decarburized layer depth after oxidized at 1400°C for 2 h of 14.03–14.87 mm.Consequently,the idea for the rapid synthesis of Al_(2)O_(3)–SiC composite powder provides an alternative low-carbon MgO–C refractories performance optimization strategy.展开更多
基金supported in part by the National Key Research and Development Program of China(No.2016YFB0601302)Science and Technology Major Programs of Hunan Province,China(No.2016GK1002)
文摘An intelligent control method is proposed to improve the performance of power supply for tundish electromagnetic induction heating,which can adequately regulate the tundish temperature.The topology structure of power supply for tundish electromagnetic induction heating is presented,and its working principle is analyzed.The power supply consists of six power units,and each of them consists of a fore-stage threephase rectifier and back-stage single-phase inverter.The feedforward control DC voltage is used by three-phase rectifier to obtain the stable DC voltage supplied to the inverter.The cloud controller based intelligent temperature control algorithm is combined with the power feed-forward algorithm to obtain accurate tracking of the output current and constant temperature control of the tundish steel in the back-stage inverter.The simulation and experiment are performed to verify the accuracy and effectiveness of the proposed method.
基金This work was financially supported by the National Natural Science Foundation of China(Grant Nos.U20A20239 and U1908227)the Fundamental Research Funds for the Central Universities(Grant No.N2125002)the open research fund for State Key Laboratory of Advance Refractories(Grant No.SKLAR202001).
文摘To improve the properties of low-carbonization of MgO–C refractories,the introduction of composite additives is an effective strategy.Al_(2)O_(3)–SiC composite powder was prepared from clay using electromagnetic induction heating and carbon embedded methods.Further,the Al_(2)O_(3)–SiC composite powder synthesized by electromagnetic induction heating at 600 A was added into low-carbon MgO–C refractories(4 wt.%)to improve their properties.The results showed that when the addition amount of Al_(2)O_(3)–SiC composite powder is within the range of 2.5–5.0 wt.%,the properties of low-carbon MgO–C samples were significantly improved,e.g.,the apparent porosity of 7.58%–8.04%,the bulk density of 2.98–2.99 g cm-3,the cold compressive strength of 55.72–57.93 MPa,the residual strength after three air quenching at 1100°C of 74.86%–78.04%,and the decarburized layer depth after oxidized at 1400°C for 2 h of 14.03–14.87 mm.Consequently,the idea for the rapid synthesis of Al_(2)O_(3)–SiC composite powder provides an alternative low-carbon MgO–C refractories performance optimization strategy.
