Chinese researchers developed an electrical heating mannequin to assist uniform materials temperature in a novel four-ring, 80-rod industrial Siemens reactor.
A Chinese group led by researchers from Kunming University of Science and Technology and Yunnan Yuntong Zinc Co. constructed a mannequin to simulate electrical warmth processing of U-shaped silicon rods in a novel four-ring, 80-rod industrial Siemens reactor.
Noting that earlier research demonstrated that utilizing high-frequency alternating present (AC) might “significantly improve temperature uniformity in polysilicon rods due to the skin effect,” albeit in a lot smaller-sized reactors, the analysis group developed a brand new heating mannequin. It included thermal and electrical habits and multi-ring interplay for large-scale polysilicon discount furnaces.
In the research, “The temperature uniformity within U-style silicon located in a novel 80-rod siemens reactor with a high silicon core,” printed in Results in Engineering, the group described its investigation of the consequences of direct present (DC) and AC heating on thermal and electrical efficiency throughout the polysilicon discount furnace.
The aim was to assist a extra uniform temperature distribution between the middle and floor of the silicon rods to improve process energy efficiency.
The numerical simulations of the polycrystalline silicon materials had been achieved with Comsol software program. The research additionally used the Joule heating mannequin, direct present mannequin, and warmth switch mannequin. Details had been additionally offered in regards to the boundary circumstances, key parameters, and the way temperature gradients in the reactor had been decided.
To validate the accuracy of the simulation, the voltage obtained from the mannequin was in contrast to knowledge from an industrial 80-rod polysilicon discount reactor.
The evaluation indicated that the mannequin “accurately” predicts the thermal and electrical habits with a relative error of lower than 10%, in accordance to the paper.
The researchers mentioned that AC heating “significantly improves temperature uniformity” and that modifying the frequency can cut back the middle temperature. The regression equation primarily based on the typical knowledge of 4 rings developed by the group reportedly precisely predicts with a median relative error of solely 4.62%.
The group additionally famous the “strong” interplay between frequency and diameter at between 5 kHz and 200 kHz. Above 300 kHz, the temperature distinction stabilizes, and the interplay impact weakens, it mentioned.
The analysis group had members from Yunnan Yuntong Zinc Co., Kunming University of Science and Technology, Yunnan Tongwei High Purity Crystal Silicon, a unit of Tongwei, and Kunming Metallurgical Research Institute.
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