Box type resistance furnace calibration method and steps
Box-type resistance furnaces are widely used as experimental equipment in coal, electric power, petrochemical, military, metallurgy and other industries. The accuracy of their performance is directly related to the reliability of experiments in related fields. In order to ensure the accuracy and reliability of the box-type resistance furnace, this article conducts an in-depth study on the calibration methods and steps of the box-type resistance furnace, and proposes a relatively simple and reasonable calibration scheme.
1. Determination of work area
During the calibration process of a box-type resistance furnace, the first task is to determine the working area of ââthe furnace. The author mentioned two methods of determining the working area, one is to use the "furnace size" as a design parameter, and the other is to use the "working area size" provided by the customer being calibrated. Reasonable determination of this step is crucial for subsequent calibration.
2. Determination of temperature measurement points
According to the size of the box-type resistance furnace working area, design the size of the temperature measurement frame, and determine 5 temperature measurement points and 1 monitoring point. The reasonable selection of these temperature measurement points is directly related to the accuracy of subsequent temperature measurements. The author mentioned that these temperature measurement points are located at the center point and four end corners of the work area. The temperature measurement data at these points can comprehensively evaluate the uniformity of the temperature in the furnace.
3. Selection of temperature calibration device
The temperature calibration device is the core component of the box-type resistance furnace calibration, which consists of measuring instruments, thermocouples and supporting equipment. When selecting a temperature calibration device, the expanded uncertainty introduced by it needs to be considered to ensure that it meets the calibration requirements for the temperature uniformity of the box-type resistance furnace.
4. Calibration process
The actual calibration process is mainly carried out under the condition of empty furnace. During the heating process, the temperature data of each temperature measurement point is measured by measuring instruments, and the temperature displayed at the monitoring point, each temperature measurement point and the temperature control instrument is recorded. This process needs to be maintained for 60 minutes after the furnace temperature reaches the calibration temperature, and data is recorded every 3 minutes.
5. Calculation
During the calibration process, the furnace temperature uniformity and furnace temperature stability are calculated from the recorded data. These two parameters directly reflect the performance of the box-type resistance furnace and are the key to judging whether the furnace is qualified or not.
Through the detailed steps and reasonable calculation methods provided in this article, we can better calibrate the box-type resistance furnace to ensure that it can provide an accurate and reliable temperature environment in practical applications. Such a calibration method not only meets the technical requirements, but is also relatively easy to implement, and is expected to promote the development of my country's box-type resistance furnace production and calibration industry.
