Polycrystalline ingot casting anti-arcing furnace crucible cover plate and use method thereof

Abstract

A polycrystalline ingot casting anti-arcing furnace crucible cover plate comprises a square cover plate body, the square cover plate body is provided with a center hole and a vent hole, the center hole is arranged in the center of the square cover plate body, and four corners of the square cover plate body are provided with avoiding gaps. The avoiding gaps can be square, right angled isosceles triangular or right angle sectored in shape. The part of the four corners upward warping due to deformation, in contact with a top graphite heating plate, is cut off to form the gaps, so the contact of the crucible cover plate with a bolt on the top graphite heating plat due to bending deformation is avoided, an arching sparking phenomenon is avoided, and damages of arcing to an ingot casting furnace heating element are avoided. The cover plate disclosed in the invention has 3-6 month longer life, discarding of a graphite heater and the graphite bolt due to sparkling is avoided, and the safe stable production of an ingot casting furnace is guaranteed.

Description

Technical field: [0001] The invention relates to a crucible for a polycrystalline ingot casting furnace, in particular to an anti-deformation polycrystalline ingot casting furnace crucible cover plate. Background technique: [0002] Solar energy is a green and renewable energy. In the effective use of solar energy, photovoltaic utilization is the fastest growing and most dynamic research field in recent years. With the rapid development and continuous promotion and application of solar cells in recent years, the market demand for solar cells is increasing. Crystalline silicon solar cells are more and more used in the energy field, among which silicon material is the main carrier of photovoltaic utilization, and the preparation of crystalline silicon is the basis of photovoltaic cells. [0003] At present, the preparation of polycrystalline silicon ingots at home and abroad mostly adopts the directional solidification method. This method is to prepare the silicon material in...

AI Technical Summary

Problems solved by technology

During the operation of imported or domestic polycrystalline ingot furnaces, since the crucible cover plate is directly covered on the side plate of the crucible, increasing the feeding amount will compress the gas capacity space in the crucible, and the side exhaust port will also often be reduced, resulting in The gas is not discharged smoothly, the air pressure increases, and the thermal shock stress on the crucible cover plate becomes larger, resulting in that the internal stress of the cover plate cannot be completely eliminated during the cooling and crystallization stage of the silicon liquid.

The deformed crucible cover plate sinks in the middle and the four corners are warped upwards. The four corners are easy to contact with the bolts on the top graphite heating plate, resulting in arcing and sparking, causing the two-phase current to exceed 400A and alarming. At the same time, the heating element of the ingot furnace will be severely damaged. Damage, such as: burning of graphite or carbon-carbon bolts, graphite heating plate and crucible cover plate, etc. In severe cases, the graphite heater will break

The safety of the equipment will be greatly affected and the corresponding spare parts of the equipment must be replaced, and the bent and deformed crucible cover can no longer be used and scrapped, resulting in huge economic losses

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