Fuel-gas-heating directional solidification furnace

Abstract

The invention relates to a directional solidification technology, in particular to a fuel-gas-heating directional solidification furnace used in a metallurgical-process polycrystalline silicon preparation process and aiming to solve the problems of singleness in selecting heat sources and higher operating cost of the traditional directional solidification method. The directional solidification furnace disclosed by the invention comprises a supporting steel base, a lifting mechanism arranged at a middle position of the bottom of the supporting steel base, and a furnace body fixed on the supporting steel base. The directional solidification furnace is characterized in that a supporting platform is arranged above the lifting mechanism, a crucible is arranged above the supporting platform and is located at a core part of the furnace body, the furnace body comprises a shell, a furnace wall is arranged at the inner side of the shell, a foamed ceramic layer is arranged at the inner side of the furnace wall, a crucible protecting layer is arranged at the inner side of the foamed ceramic layer, the crucible protecting layer is appressed to the crucible, a burner nozzle channel is formed in the furnace wall, a gap is formed between the furnace wall and the foamed ceramic layer, a plurality of heating areas are divided into along the up-down direction of the crucible, and each heating area is provided with a plurality of burner nozzles. According to the invention, fuel gas energy can be adopted to replace electric energy, and the advantages of controllable heating process, energy saving and low manufacturing cost are achieved.

Description

technical field [0001] The invention relates to directional solidification technology, in particular to a gas-heated directional solidification furnace in the process of preparing polysilicon by metallurgy. Background technique [0002] Directional solidification technology is widely used in industry, mainly used to produce magnetic materials, aviation and ground gas turbine blades, self-generated composite materials and various functional crystals; in the field of research, directional solidification is the basic means to study metal solidification and crystal growth . The directional solidification method usually refers to the method of melting in the same crucible, using impurity elements in the solid phase and liquid phase, and the segregation effect to achieve the purpose of purification. At the same time, the melt in the crucible reaches a certain temperature through unidirectional heat flow control. Gradient, so as to obtain the columnar grain structure neatly arrang...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of single heat source selection and high operating cost in the existing directional solidification method, in order to increase the selection of diversified energy sources and reduce energy consumption costs, and provide a gas-heated directional solidification furnace with reasonable structural design. It mainly combines the good flame propagation and heat transfer performance of foam ceramics with the directional solidification furnace of quartz crucible, that is, the method of heating by induction coil or resistance is replaced by gas flame heating, so as to uniquely design the overall structure of the furnace body. To meet the technological requirements of metallurgical polysilicon directional solidification furnace

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