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Method for improving atmosphere cleanness in polycrystalline silicon ingot furnace

A polycrystalline silicon ingot furnace and furnace atmosphere technology, which is applied to the high-efficiency ingot casting process, effectively improves the cleanliness of the atmosphere in the ingot furnace, and can solve the problem of affecting the efficiency of polycrystalline silicon slice yield, impurity can not be effectively discharged with the air flow, ingot casting Problems such as unreasonable process air flow, to achieve the effect of convenient implementation, non-volatile, and improved cleanliness

Inactive Publication Date: 2019-01-22
包头美科硅能源有限公司
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Problems solved by technology

Due to the long working life of the polycrystalline silicon ingot casting furnace, the thermal field in the furnace is easy to age. The thermal field refers to the heater and heat preservation, which are all carbon materials. The aging leads to the increase of carbon impurities in the furnace, and the carbon impurities enter the silicon with the airflow during the crystal growth process. The melt and the unreasonable air flow in the ingot casting process may easily cause impurities to not be effectively discharged with the air flow, affecting efficiency and yield of polysilicon slices

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  • Method for improving atmosphere cleanness in polycrystalline silicon ingot furnace

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Embodiment Construction

[0014] A method for improving the cleanliness of the atmosphere in a polysilicon ingot furnace, including two improvements:

[0015] On the one hand, the organic reagent with low vapor pressure and high viscosity is adhered to the inner wall of the furnace. The kinematic viscosity of organic reagent: 40-100 mm2 / s at 40 °C; vapor pressure: below 1×10-2 Pa at 50 °C (for example, satisfying Lubricating oils with the above viscosity and vapor pressure conditions, mineral oils or synthetic oils are acceptable). The organic reagent is brushed on the inner wall of the furnace before the furnace is put into operation. Low vapor pressure organic reagents are not easy to volatilize in the high temperature environment in the furnace, and the viscosity is high, which can adhere to the particulate impurities in the furnace, reducing the particulate impurities in the initial stage of operation and the particulate impurities in the airflow during operation

[0016] On the other hand, during...

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Abstract

The invention discloses a method for improving atmosphere cleanness in a polycrystalline silicon ingot furnace. Before running of the ingot furnace, a low-vapor-pressure high-viscosity organic reagentadheres to the inner wall of an ingot furnace body. In the running process of the ingot furnace, impurities can be discharged more easily by adopting reasonable air current control. The method is convenient to implement, the atmosphere cleanness in the polycrystalline silicon ingot furnace can be improved effectively, the impurities are reduced, and the product yield is improved.

Description

technical field [0001] The invention relates to polycrystalline silicon ingot casting technology for solar cells, and relates to a method for effectively improving the cleanliness of the atmosphere in an ingot casting furnace, which is used in a high-efficiency ingot casting process. Background technique [0002] The polysilicon ingot furnace is mainly used for the production of solar-grade polysilicon ingots. It adopts advanced polysilicon directional solidification technology, melts the silicon material at high temperature and then condenses and crystallizes it through a special process, so as to meet the quality requirements of polysilicon for solar cell production. It is a kind of It is suitable for intelligent production equipment with long-term continuous work, high precision, high reliability and high degree of automation. Due to the long working life of the polysilicon ingot casting furnace, the thermal field in the furnace is easy to age. The thermal field refers to...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B28/06C30B29/06
CPCC30B28/06C30B29/06
Inventor 马翔宇路景刚张泽兴黄振华
Owner 包头美科硅能源有限公司
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