Research Of Regenerative Ladle Baking Control System

Ladle is an important tool which is indispensable for steel production, especially serving as the molten steel container during its transportation. However, during the transportation, the starting temperature of molten steel ladle will affect the temperature of molten steel. The lower starting temperature of containing molten ladle directly leads to the decrease of the molten steel temperature, resulting in the molten steel in the ladle being unsatisfactory in the subsequent production. Study found that when the initial temperature of the ladle reached 1000℃, it will greatly reduce the heat loss of molten steel in the ladle. Therefore, it is necessary to use an efficient Ladle device heated to the temperature of 1000℃ before use, in order to conduct the follow-up process, and completed the puzzle of the new ladle heating and drying work at the same time. It takes a series of actual production conditions such as high ambient temperature, dusty and noisy environment, as well as high rate of equipment false alarm, No PC monitor, large waste of manual fuel control, poor baking equipment into consideration in this research, choosing a ladle baking regenerative renovation project of a workshop in a steelmaking mill as the background. It aims at designing a suitable regenerative Ladle control system with energy saving, high stability and high combustion efficiency, by studying HTAC technology, baking strategy, PLC hardware, computer software and many other technologies.The Ladle device is designed with vertical structure, and its main hardware includes: ladle cover, rack, fan, blower, hoist, regenerative burners, nitrogen pipelines, gas pipelines, gas discharge pipes, combustion air duct cooling air pipes. And regenerative burners use single preheat ones, that is, only for preheating the combustion air. Ignition burner can not only complete the regenerative burner ignition operation, but also be used as a long flame. Ladle temperature measurement uses non-contact infrared thermometer to measure the temperature of the outer wall to determine ladle heating process. Communication between PC and PLC controller is realized by ZigBee wireless communication network. The main softwares include: ANSYS used for the simulative establishment of a relationship between the temperature of outside ladle wall and ladle heating states, drawing into the heat baking temperature control curve. The baking controlling system is designed and includes four parts: temperature cascade control, dualloop ratio adjustment, cross limiting control, gas and air traffic control system, singleloop controller. Wherein, the main temperature controller design uses parameters selftuning fuzzy PID controller, and deputy controller uses PID controller to adjust the gas and air flow through the cross limiting.Control system simulation analysis and solving simulation results meet the control requirements. The designed system can keep the ladle efficient and baking stable...