Contact measurement method for temperature of high-temperature gas based on steady-state energy flow balance relation

Abstract

The invention belongs to the technical field of temperature measurement instruments, discloses a contact measurement method for the temperature of high-temperature gas based on a steady-state energy flow balance relation and aims to solve the problems existing in measurement of the temperature of a high-temperature heat source in an open state. The method comprises the following steps of: establishing a steady-state equation of a probe tungsten filament and the surrounding environment, measuring a voltage value V at the two ends of the probe tungsten filament and a current value I flowing through the probe tungsten filament through an ampere meter and a voltmeter of a measuring device, thereby calculating the probe tungsten filament resistance R and the probe tungsten filament temperature TW; and substituting the voltage value V, the current value I, the probe tungsten filament temperature TW, the probe tungsten filament superficial area S1 obtained through direct measurement, the total radiation area S2 of the probe tungsten filament, the known heat transfer coefficient beta of the environment and the probe tungsten filament, and Stefan-Boltzmann constant sigma into the established steady-state equation to obtain the temperature TS of the environment gas. The method is easy to operate and low in cost, contact measurement can be carried out on the temperature of 2000-6000 K, and the temperature measurement range of contact measurement is greatly widened.

Description

technical field [0001] The invention relates to the technical field of temperature measuring instruments, in particular to the measurement of temperatures above 2000°C, in particular to a contact measurement method for high-temperature gas temperature based on a steady-state energy-flow balance relationship. Background technique [0002] Many industrial applications, such as the heat treatment of workpieces, the environment of chemical reactions, and the obtaining of energy through combustion, etc., need to be carried out in a high temperature environment. If it is carried out in a closed furnace body, the furnace body can usually be considered to have reached thermal equilibrium. The temperature of objects in the furnace body can be considered the same. Therefore, in most cases, thermocouples are used to conveniently measure the temperature in the furnace body, such as a tungsten-rhenium thermocouple suitable for oxidation and reduction atmospheres at 800-2300°C disclosed i...

AI Technical Summary

Problems solved by technology

However, in some applications, such as atmospheric pressure plasma torches and aero-engine combustion, the heat source is often in an open state, and the temperature value is far beyond the range that can be measured by the current contact method

In this case, non-contact optical measurement methods are required, such as spectrometry, which is more important. However, it requires expensive optical equipment and professionals with a certain foundation to perform measurements. Therefore, in high-temperature open heat source measurements In the field of high temperature (such as plasma, high temperature reaction furnace, etc.), it is urgent to develop a convenient measurement method to fill this gap.

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