Fault handling process for temperature-controlling thermal couple of polysilicon ingot furnace

Abstract

The invention discloses a treatment method of temperature control thermocouple fault of a polysilicon ingot furnace. When the temperature control thermocouple has fault, the closed-loop temperature control of the temperature control thermocouple is converted into open-loop power control to control the heating power. The invention has a realization method that when the temperature control thermocouple is normally working, the temperature characteristic data of the heater are stored for every interval time; when the temperature control thermocouple has fault, the stored temperature characteristic data of the previous furnace is taken out to trace the trail of the setting value of the heating power and to directly control the heating power of the heater to realize the open-loop temperature control. The treatment method of temperature control thermocouple fault of the polysilicon ingot furnace is reliable and is easy to be realized, which can enhance the reliability of the equipment to the maximum limit and can satisfy the requirement of safety production of the polycrystalline silicon ingot furnace.

Description

technical field [0001] The invention relates to an emergency response measure for a temperature-controlling thermocouple failure of an industrial furnace, and further refers to a method for treating the failure of a polycrystalline silicon ingot furnace temperature-controlling thermocouple failure. Background technique [0002] At present, the production process for preparing silicon ingots for solar cells mainly includes single crystal silicon pulling and polycrystalline silicon pulling. Polysilicon ingot casting technology has become the mainstream method for preparing silicon ingots for solar cells because it can directly melt and cast square silicon ingots suitable for large-scale production, and the manufacturing process is relatively simple. [0003] To prepare large-sized square ingots for solar polycrystalline silicon cells, 240-270kg of silicon material is loaded at a time, and the products are very expensive, worth more than RMB 500,000. Its production process inc...

AI Technical Summary

Problems solved by technology

The whole process of the ingot casting process is vacuumed. Because the temperature control thermocouple is placed in high temperature and vacuum state for a long time and the carbon element volatilized by the graphite heater at high temperature penetrates into the thermocouple protection ceramic tube and the platinum and rhodium wire material, etc., it is easy to Cause thermocouple breakage, aging, failure, vacuum leakage

Once the temperature control thermocouple fails, it will seriously affect the production of silicon ingots and cause very large economic losses

[0004] The commonly used methods are: 1) Set up a set of backup thermocouples, and the control device will automatically switch to the backup thermocouples for temperature control. This method is expensive and uneconomical in terms of consumables; Difficult, when a fault occurs, the temperature drops and the vacuum pressure rises; 3) The process is forced to stop in an emergency, resulting in production being abandoned halfway

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