Brief Discussion on the Application of Infrared Thermometers in Ironworks
The temperature measuring device of this system is basically similar to the vault temperature measurement system. The infrared probe equipped with a protection device is installed in the original thermocouple jack of the hot air duct. The infrared probe passes through the sealing window of the protection device and the reserved thermocouple jack to aim at the interior of the hot air duct, so as to measure the internal temperature. Since the temperature probe of this system is installed outside the sealing window, the entire temperature measurement system is completely isolated from the hot air inside the pipeline. Therefore, probe replacement and other maintenance work can be carried out without affecting the operating state of internal hot air.
Conventional thermocouples must be replaced under blast shutdown conditions. As consumable components, thermocouples are prone to frequent damage. This temperature measurement system effectively reduces thermocouple consumption and cuts down equipment operating costs. At present, it has been applied in enterprises including Benxi Steel, Chengde Steel and Laiwu Steel, achieving remarkable economic benefits.
Temperature Measurement of Molten Iron at Furnace Front
The HDIR series infrared thermometer measures molten iron temperature at the furnace front in the following way: the infrared temperature probe with an air blowing sleeve is fixedly mounted on a bracket 5 to 15 meters away from the molten iron channel and aimed at the trough for continuous scanning measurement of each furnace batch. The temperature signals collected by the probe are transmitted to a recorder for temperature curve printing or to a computer for data processing.
The core advantage of this system lies in its automatic and continuous temperature measurement for each molten iron batch, which eliminates human interference caused by manual insertion temperature measurement. Analysis of recorded temperature curves and computer-processed data accurately reflects the temperature variation trend of each batch and directly displays the maximum temperature, providing solid support for production management and process optimization. The system is currently in service at Echeng Iron & Steel, Shougang Group and other enterprises, winning wide recognition from users.
The vault of a hot blast stove is a special operating area. Vault temperature measurement needs to adapt to high-temperature and high-pressure working conditions, as well as open-air environmental changes throughout the year. Through repeated testing and optimization, we have developed a dedicated protection device with a sealing window.
In application, the infrared probe matched with the protection device is fixed at the original thermocouple mounting position on the vault. The probe targets the interior of the hot blast stove through the sealing window and thermocouple jack to monitor vault temperature. Collected signals are transmitted via cable to the instrument box in the control cabinet for processing, realizing real-time temperature display and 4-20 mA standard current signal output for recorder or computer analysis.
With no direct contact between the infrared probe and high-temperature objects, the system features high stability, reliability and long service life, supporting continuous operation for more than five years. It greatly reduces thermocouple consumption, equipment operating costs and maintenance workload.
Humidity sensor probe, stainless steel electric heating tube, PT100 sensor, cast aluminum heater, heating coil, fluid solenoid valve
