Energy-saving polycrystalline ingot casting furnace

Abstract

The invention discloses an energy-saving polycrystalline ingot casting furnace. The energy-saving polycrystalline ingot casting furnace comprises a furnace body, a crucible arranged in the furnace body as well as a graphite supporting column for supporting the crucible; graphite protective plates are arranged at the periphery and the bottom of the crucible; a heat exchange platform is arranged below the graphite protective plate at the bottom of the crucible; side heaters are arranged on the outer sides of the graphite protective plates at the periphery of the crucible; a top heater is arranged above the crucible; the energy-saving polycrystalline ingot casting furnace also comprises a thermal field heat-insulating felt; the thermal field heat-insulating felt encloses the crucible, the graphite protective plates, the heat exchange platform, the side heaters and the top heater; one end of the graphite supporting column is connected with the heat exchange platform at the bottom, and theother end passes through the thermal field heat-insulating felt and then is supported on the furnace body; a heat-insulating piece is arranged on the graphite supporting column; and the heat-insultingpiece is arranged on the outer wall of the graphite supporting column in a wrapping mode. The energy-saving polycrystalline ingot casting furnace effectively reduces the loss of heat in the crucible,reduces energy consumption and reduces cost.

Description

technical field [0001] The invention relates to a polycrystalline ingot casting furnace, in particular to an energy-saving polycrystalline ingot casting furnace. Background technique [0002] At present, solar cells (groups) are mostly polycrystalline silicon solar cells, among which crystalline silicon materials are the most important photovoltaic materials, and crystalline silicon materials will still be the mainstream materials of solar cells for a long period of time in the future. Usually, the equipment for manufacturing polysilicon crystal is an ingot furnace, and the existing polysilicon ingot furnace is mainly composed of a furnace body, a heat insulation cage, a crucible, a heater, and a heat exchange table. [0003] The working principle of the existing polysilicon ingot casting furnace is: first heat the crucible, so that the silicon material in the crucible reaches a molten state at a certain temperature, and then open the heat insulation cage from bottom to top ...

AI Technical Summary

Problems solved by technology

[0004] 1. During the heating process, since the bottom of the crucible is equipped with multiple graphite support columns, the heat at the bottom of the crucible will be conducted through the graphite support columns, resulting in partial heat loss of the crucible. In actual production, in order to avoid If the heat loss is too fast, the heating time or heating power of the crucible is usually increased to make up for the lost heat, so as to ensure that the temperature at the bottom of the crucible is kept within a certain range, but it will cause a lot of power consumption, because the power consumption is the silicon ingot One of the main costs of production, resulting in higher cost of polysilicon production

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