Application guidance of fixed online thermometer in ironmaking plants
Application guidance of fixed online thermometer in ironmaking plants: We are using the hot blast furnace vault temperature measurement. The hot blast furnace vault is a special occasion. The measurement of the vault temperature must not only solve the high temperature and high pressure of the measured target. problem, and it must adapt to the changing requirements of the open air environment throughout the year. After repeated practice and improvement, Jintai Company designed a set of special protection devices with sealed windows. The method of use is to install an online thermometer equipped with a protective device on the vault where the thermocouple was originally inserted, so that the probe can pass through the sealed window and thermocouple jack, aim at the inside of the hot air furnace, and measure the hot air. The temperature of the furnace vault, the probe signal is sent to the instrument box installed on the control cabinet through the cable for processing, the temperature value is displayed, and a 4-20mA standard current signal is output, which can be sent to a recorder or computer for processing. Because the infrared probe of the system does not contact high-temperature targets, it is stable, reliable, and has a long service life. It can usually run continuously for more than five years, which can reduce thermocouple consumption and greatly reduce equipment operating costs and maintenance workload.
Measurement of internal temperature of hot air ducts in ironworks
The temperature measurement device of the online thermometer system is basically similar to the vault temperature measurement system. The infrared probe equipped with a protective device is installed on the original thermocouple socket of the hot air duct, and the infrared probe is passed through the sealed window of the protective device. Aim at the inside of the hot air duct through the socket of the original galvanic couple, thereby measuring the temperature inside the hot air duct. The temperature measurement probe of this system is installed outside the sealed window, and the entire temperature measurement system is completely isolated from the hot air in the pipe. Therefore, the probe replacement or other maintenance work of this system can be carried out without affecting the working status of the hot air in the pipe. The commonly used thermocouples must be replaced when the wind is off. In addition, thermocouples are consumables and are damaged more frequently. The temperature measurement system can reduce the consumption of thermocouples and reduce the operating costs of the equipment. Currently, the system has been used by Benxi Iron and Steel, Chenggang, Laiwu Iron and Steel and other units, and has achieved good economic benefits.
Ironworks: Measurement of molten iron temperature in front of the furnace
The method of measuring the molten iron in front of the furnace with an online infrared thermometer is: fixedly install the infrared temperature measurement probe equipped with a blower sleeve on a bracket 5-20 meters away from the molten iron, aim at the molten iron ditch, and continuously scan and measure the molten iron in each furnace. , the temperature signal measured by its probe is connected to the recorder to print the temperature curve or sent to the computer for data processing. The biggest advantage of this system is that it can automatically and continuously measure the temperature of molten iron in each furnace, which can effectively avoid the influence of human factors caused by manual insertion of temperature measurement methods. By analyzing the recorded temperature curve or other computer-processed information, it can more truly reflect the changing trend of the temperature of each furnace of molten iron, and intuitively read out the maximum temperature of each furnace, providing a strong basis for production management and process improvement. At present, this system is used by many well-known units such as Esteel and Shougang, and has won unanimous praise from users.
