Real-time monitoring technology for electric arc furnace steelmaking
2.1 New Technology of Temperature Measurement and Sampling
In the process of electric arc furnace steelmaking, the temperature measurement and sampling of molten steel have been one of the key links restricting the electric energy consumption and production efficiency of electric arc furnace. Aiming at the problems of poor safety and high cost of traditional manual temperature measurement sampling, a series of new automatic temperature measurement sampling technologies have been developed and popularized.
2.1.1 Automatic Temperature Measurement Sampling
At present, the commonly used sampling and temperature measurement method is to insert the sampler or thermocouple from the furnace door into the molten steel. Simetal LiquiRob automatic temperature-measuring and sampling robot designed by SIEMENSVAI company has special dust-proof and heat-insulating fibers on its outer layer. It has the functions of six degrees of freedom movement, automatic replacement of sampler and temperature-measuring probe, detection of invalid temperature-measuring probe and so on. It can be fully controlled by man-machine interface. The PTITemp Box TM automatic temperature measurement and sampling system developed by PTI Company in the United States enters the molten pool through the furnace wall for temperature measurement and sampling. The transmission mechanism and cooling system of the device have been specially designed to meet the harsh environment and technological requirements of electric arc furnace smelting, improve the heat transfer efficiency in the furnace, and reduce the energy consumption in the smelting process.
At present, most domestic electric arc furnace steelmaking enterprises still adopt the traditional manual sampling method and advanced automatic temperature measuring and sampling device, which has been introduced into the actual production of domestic electric arc furnace in recent years.
2.1.2 Non-contact Continuous Temperature Measurement
The real-time and accurate monitoring of molten steel temperature can play a guiding role in optimizing the process of making foamed slag, dephosphorization of molten steel and optimizing power supply. In view of the high temperature and harsh smelting environment in the process of EAF steelmaking, it has been difficult to achieve continuous monitoring of the temperature of molten steel. SIEMEN SVAI has developed an innovative scheme, a non-contact continuous steel temperature measurement system (Simetal RCBTemp) based on combined supersonic spray gun. Different from the traditional temperature measurement method, the system can accurately measure the temperature of molten steel and tapping time in a short time, so that both the power-on time and power-off time in the process of electric arc furnace steelmaking are optimal. The system realizes continuous temperature measurement of non-contact molten steel and improves the production capacity of electric arc furnace steelmaking. However, the reliability and service life of the temperature measurement system need to be further verified and improved.
2.2 foam slag monitoring and control technology
The foam slag operation in EAF steelmaking process can separate the steel from the air, cover the arc, reduce the heat loss to the furnace wall and the furnace cover, and efficiently convert the electric energy into heat energy to convey to the molten pool, improve the heating efficiency and shorten the smelting cycle. Foaming slag is the key to low consumption and high productivity electric furnace steelmaking. In recent years, relevant monitoring and control technologies for foam slag operation have been studied and applied.
SIEMENS developed SimeltFSM foam slag monitoring system. In view of the influence of the height and distribution of foamed slag on the sound transmission in furnace, the existence state of foam slag in the furnace can be qualitatively determined, the operation of foam slag and the stabilization of electric arc can be adjusted to improve the energy supply of electric arc furnace and improve the production efficiency.
The electric arc furnace door cleaning and foam slag control system PTISwingDoorTM developed by PTI company has reduced the entry of external air and improved the sealing performance of steelmaking process. Thus, the thickness of slag layer in furnace is ensured, energy consumption is reduced, arc heat transfer efficiency is improved and energy utilization efficiency is improved.
At present, most of the steel mills in China still use artificial methods to control the production of foamed slag. Some steel mills have adopted the electric arc furnace system to optimize the energy utilization efficiency. Due to the complexity of the EAF steelmaking furnace, the reliability of the foam slag monitoring system based on sound emission inside the furnace needs to be verified.
2.3 Continuous Flue Gas Analysis System
Modern electric arc furnace steelmaking integrates high efficiency, safety and environmental protection. The requirements for flue gas detection, control and process optimization in steelmaking process are getting higher and higher. Modern electric arc furnace flue gas analysis system can accurately measure the temperature and flow rate of flue gas and the composition of CO, CO 2, H2, O 2, H 2 and CH 4 in flue gas. The flue gas analysis system uses the collected information and its own control model to analyze, judge and control the smelting process. The on-line flue gas detection sensor is usually installed at the fourth hole of the electric arc furnace. Special design is needed to adapt to the harsh high temperature and dust environment of the fourth hole and increase its reliability and service life.
The secondary combustion system based on furnace gas analysis developed by Praxair Company of the United States was used to control oxygen consumption in secondary combustion in Huaihua Iron and Steel Company of Jiangsu Province. The obvious energy saving effect was achieved. The power consumption per ton of steel was reduced by 28 kWh, and the smelting time was shortened by 7.5 minutes.
The flue gas analysis system has been widely used in electric arc furnaces at home and abroad with good results. As far as practical application is concerned, high temperature and dust resistant gas detection sensors need to be further developed to further reduce the cost of use and improve the accuracy of gas analysis.
In the process of electric arc furnace steelmaking, the temperature measurement and sampling of molten steel have been one of the key links restricting the electric energy consumption and production efficiency of electric arc furnace. Aiming at the problems of poor safety and high cost of traditional manual temperature measurement sampling, a series of new automatic temperature measurement sampling technologies have been developed and popularized.
2.1.1 Automatic Temperature Measurement Sampling
At present, the commonly used sampling and temperature measurement method is to insert the sampler or thermocouple from the furnace door into the molten steel. Simetal LiquiRob automatic temperature-measuring and sampling robot designed by SIEMENSVAI company has special dust-proof and heat-insulating fibers on its outer layer. It has the functions of six degrees of freedom movement, automatic replacement of sampler and temperature-measuring probe, detection of invalid temperature-measuring probe and so on. It can be fully controlled by man-machine interface. The PTITemp Box TM automatic temperature measurement and sampling system developed by PTI Company in the United States enters the molten pool through the furnace wall for temperature measurement and sampling. The transmission mechanism and cooling system of the device have been specially designed to meet the harsh environment and technological requirements of electric arc furnace smelting, improve the heat transfer efficiency in the furnace, and reduce the energy consumption in the smelting process.
At present, most domestic electric arc furnace steelmaking enterprises still adopt the traditional manual sampling method and advanced automatic temperature measuring and sampling device, which has been introduced into the actual production of domestic electric arc furnace in recent years.
2.1.2 Non-contact Continuous Temperature Measurement
The real-time and accurate monitoring of molten steel temperature can play a guiding role in optimizing the process of making foamed slag, dephosphorization of molten steel and optimizing power supply. In view of the high temperature and harsh smelting environment in the process of EAF steelmaking, it has been difficult to achieve continuous monitoring of the temperature of molten steel. SIEMEN SVAI has developed an innovative scheme, a non-contact continuous steel temperature measurement system (Simetal RCBTemp) based on combined supersonic spray gun. Different from the traditional temperature measurement method, the system can accurately measure the temperature of molten steel and tapping time in a short time, so that both the power-on time and power-off time in the process of electric arc furnace steelmaking are optimal. The system realizes continuous temperature measurement of non-contact molten steel and improves the production capacity of electric arc furnace steelmaking. However, the reliability and service life of the temperature measurement system need to be further verified and improved.
2.2 foam slag monitoring and control technology
The foam slag operation in EAF steelmaking process can separate the steel from the air, cover the arc, reduce the heat loss to the furnace wall and the furnace cover, and efficiently convert the electric energy into heat energy to convey to the molten pool, improve the heating efficiency and shorten the smelting cycle. Foaming slag is the key to low consumption and high productivity electric furnace steelmaking. In recent years, relevant monitoring and control technologies for foam slag operation have been studied and applied.
SIEMENS developed SimeltFSM foam slag monitoring system. In view of the influence of the height and distribution of foamed slag on the sound transmission in furnace, the existence state of foam slag in the furnace can be qualitatively determined, the operation of foam slag and the stabilization of electric arc can be adjusted to improve the energy supply of electric arc furnace and improve the production efficiency.
The electric arc furnace door cleaning and foam slag control system PTISwingDoorTM developed by PTI company has reduced the entry of external air and improved the sealing performance of steelmaking process. Thus, the thickness of slag layer in furnace is ensured, energy consumption is reduced, arc heat transfer efficiency is improved and energy utilization efficiency is improved.
At present, most of the steel mills in China still use artificial methods to control the production of foamed slag. Some steel mills have adopted the electric arc furnace system to optimize the energy utilization efficiency. Due to the complexity of the EAF steelmaking furnace, the reliability of the foam slag monitoring system based on sound emission inside the furnace needs to be verified.
2.3 Continuous Flue Gas Analysis System
Modern electric arc furnace steelmaking integrates high efficiency, safety and environmental protection. The requirements for flue gas detection, control and process optimization in steelmaking process are getting higher and higher. Modern electric arc furnace flue gas analysis system can accurately measure the temperature and flow rate of flue gas and the composition of CO, CO 2, H2, O 2, H 2 and CH 4 in flue gas. The flue gas analysis system uses the collected information and its own control model to analyze, judge and control the smelting process. The on-line flue gas detection sensor is usually installed at the fourth hole of the electric arc furnace. Special design is needed to adapt to the harsh high temperature and dust environment of the fourth hole and increase its reliability and service life.
The secondary combustion system based on furnace gas analysis developed by Praxair Company of the United States was used to control oxygen consumption in secondary combustion in Huaihua Iron and Steel Company of Jiangsu Province. The obvious energy saving effect was achieved. The power consumption per ton of steel was reduced by 28 kWh, and the smelting time was shortened by 7.5 minutes.
The flue gas analysis system has been widely used in electric arc furnaces at home and abroad with good results. As far as practical application is concerned, high temperature and dust resistant gas detection sensors need to be further developed to further reduce the cost of use and improve the accuracy of gas analysis.
Huachang company specialized in metallurgical equipment, industrial furnace development and manufacturing project construction comprehensive service providers, to provide one-stop professional services!
If you are looking for related products or have any other problems, you can call the company service hotline at any time, or click the button below to communicate with us online!
Customer Service Hotline
：086-88864421
