An ingot furnace with tail gas treatment function

Abstract

The invention discloses an ingot casting furnace with the function of tail gas treatment. An upper furnace body is fixedly connected to the top inside of the installation bracket, and an insulation cover is fixedly installed on the outside of the upper furnace body. The top of the upper furnace body is connected to an inlet located at The top outlet on the outer side of the upper furnace body is located at the intake vertical pipe at the bottom of the thermal insulation board, the top of the intake vertical pipe is connected to the output end at the bottom of the rear three-way valve, and the fixed bottom of one side of the thermal insulation cover is fixedly connected with a circulating air pump. The present invention removes carbon monoxide in the mixed gas through the ammonia solution of cuprous chloride in the front scrubber, absorbs and removes the newly added ammonia in the mixed gas through the distilled water in the rear scrubber, and absorbs the mixed gas through the drying barrel The water vapor in the ingot furnace effectively prevents the carbon monoxide generated in the ingot furnace from entering the molten silicon liquid and affects the quality of the final silicon ingot, prevents the operator from inhaling carbon monoxide and affects life safety, and improves the safety of ingot furnace processing.

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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