Device and method for measuring temperature of high temperature quartz fusing furnace based on transient heat transfer theory

Abstract

The invention provides a device and a method for measuring temperature of a high temperature quartz fusing furnace based on a transient heat transfer theory. Three K type thermocouples are arranged in a quartz fusing furnace, wherein the quartz fusing furnace comprises a circular graphite sleeve; a boron nitride layer is wrapped on the graphite sleeve; a magnesium oxide layer is coated on the boron nitride layer; the three K type thermocouples are located in a same plane of the quartz fusing furnace and are distributed along the radial direction of the quartz fusing furnace on the basis of the axis of the graphite sleeve; the three K type thermocouples are connected with a computer through a wire and a signal processing device; the computer is used for calculating the temperature of the quartz fusing furnace according to the temperature measured by the three K type thermocouples. According to the invention, a plurality of K type thermocouples with temperature resistance limit of about 1200 DEG C are adopted for indirectly measuring the high temperature in the quartz fusing furnace, the measuring precision is high and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of thermophysical measurement, and in particular relates to a device and method for measuring the temperature of a high-temperature quartz melting furnace based on a transient heat transfer theory. Background technique [0002] During the processing process of bulk finished quartz, it is necessary to heat the quartz raw material to a high temperature of 2000°C. In general, the only equipment capable of measuring a temperature of 2000°C is a radiation temperature measuring instrument and a platinum-rhodium thermocouple. Since fused silica is inside the heating device, radiation cannot penetrate, so the only available temperature measurement method is a platinum-rhodium thermocouple. However, considering that the price of a platinum-rhodium thermocouple is about 3000 yuan / piece, and its lifespan will be shortened sharply under high temperature (each thermocouple can be reused up to 3 times), its cost is unaff...

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Problems solved by technology

The former is very difficult to control the heating process due to the inaccuracy of empirical estimates. Since the quality of the finished quartz product is directly affected by the heating power and time during the heating process, this method cannot produce high-quality quartz products in batches.

The high-temperature-resistant thermocouple used in the latter costs more than 3,000 yuan / piece, and measuring the high temperature of the furnace core for a long time will shorten its service life sharply, and it will usually be damaged in dozens of hours, so it will bring very high production costs , which is unaffordable for most enterprises

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