直拉单晶炉加热系统的优化设计与分析

Optimal Design and Analysis of Heating System of Czochralski Single Crystal Furnace

降低单晶硅电池的生产成本,是提高光伏产业效益的关键。在等径拉晶过程中,采用分段加热可以减少加热器的输出功率,降低加热系统的能耗。本文在分析单晶硅拉晶过程中加热区域及能耗的基础上,提出细分加热器结构改进加热电路对单晶炉加热系统进行优化。实验设计了两段加热和三段加热两种模型(即方案1和方案2),并分别将其导入有限元仿真软件进行模拟实验。结果表明,两段加热对拉晶过程的影响较大,三段加热对拉晶过程的影响较小,后者更能保证拉晶过程的稳定进行。能耗计算发现,前者能耗降低为6.98%,而后者能耗降低达到了9.49%。因此,采用三段加热的优化设计更有利于降低光伏企业的生产成本。

Reducing the production cost of the monocrystalline silicon battery is the key to improve the benifits of the photovoltaic industry.During the equal-diameter crystal pulling process,the sectional heating can reduce the output power of the heater and lower the energy consumption of the heating system.Based on the analysis of the heating area and energy consumption in the pulling process of monocrystalline silicon,this paper proposes to optimize the heating system of single crystal furnace via subdividing the heater structure and improving the heating circuit.Two-stage heating and three-stage heating(i.e.,Scheme 1 and Scheme 2,respectively)models were designed in the experiment,and they were imported into the finite element simulation software for simulation.The results show that the two-stage heating model possesses a greater effect on the pulling process,and the three-stage heating counterpart shows a smaller effect on the pulling process,which can better ensure the stability of the pulling process.The energy consumption calculation shows that the energy consumption of the former is reduced by 6.98%,while the energy consumption of the latter is reduced by 9.49%.Therefore,three-stage heating is more conducive to reducing the production cost of photovoltaic enterprises.