Ingot casting furnace with tail gas treatment function

Abstract

The invention discloses an ingot casting furnace with tail gas treatment function. The ingot casting furnace is characterized in that an upper furnace body is fixedly connected to the top end of the inner side of an installation bracket, a heat preservation sleeve is fixedly installed on the outer side of the upper furnace body, a gas inlet vertical pipe with an inlet located in the top of the outer side of the upper furnace body and an outlet located in the bottom end of a heat insulation plate is connected to the top end of the upper furnace body, the top end of the gas inlet vertical pipe is connected to the output end of the bottom of a rear three-way valve, and the fixed bottom of one side of the heat preservation sleeve is fixedly connected with a circulating gas pump. According to the invention, water vapor in mixed gas is adsorbed through a drying barrel, so that carbon monoxide generated in the ingot casting furnace is effectively prevented from entering molten silicon liquidto affect the quality of final silicon ingots, operators are prevented from inhaling carbon monoxide to affect life safety, and the machining safety of the ingot furnace is improved.

Description

technical field [0001] The invention relates to the technical field of ingot casting furnaces, in particular to an ingot casting furnace with tail gas treatment function. Background technique [0002] The ingot casting furnace is a professional equipment used to prepare solar-grade polycrystalline silicon ingots. With the vigorous rise of the photovoltaic industry, it has developed rapidly. The production process of polycrystalline ingots is actually a process of melting and recrystallizing silicon materials. Vacuum, heating, melting, crystal growth, annealing, cooling, furnace and other processes; [0003] However, in the process of producing polysilicon in the current ingot casting furnaces on the market, in order to obtain low-defect high-quality silicon ingots, the raw materials need to be melted gradually from top to bottom, and the molten raw materials in the crucible are also required in the crystal growth process. The crystal grows vertically from bottom to top, so ...

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Problems solved by technology

[0003] However, in the process of producing polysilicon in the current ingot casting furnaces on the market, in order to obtain low-defect high-quality silicon ingots, the raw materials need to be melted gradually from top to bottom, and the molten raw materials in the crucible are also required in the crystal growth process. The crystal grows vertically from bottom to top, so that the heater in the ingot furnace needs to be installed on the top of the ingot furnace. During the heating and melting process, the heat in the ingot furnace mainly gathers at the top, thereby slowing down the melting of the raw materials in the lower layer of the crucible. speed, thereby prolonging the heating time, reducing the processing efficiency, and causing a waste of energy;

[0004] This patent is an improved invention, which is a further improvement on the basis of the Chinese patent submitted by the applicant on July 31, 2020. During the use of the ingot furnace, the inventor found that due to the lack of a corresponding exhaust gas treatment mechanism, the polysilicon The carbon monoxide produced during the heating process enters the molten silicon liquid, resulting in high carbon and oxygen content in the final silicon ingot, resulting in a decline in the quality of polycrystalline silicon ingots, thus affecting the application effect of solar panels made of polycrystalline silicon

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