The basic functions of EAF steelmaking and the three engineering problems of improving energy conversion—increasing energy supply, increasing input power, and increasing energy utilization efficiency—describe in detail the current EAF steelmaking process in the entire steel manufacturing process. The important role. According to the production results of four large-scale EAF steelmaking processes in China in 2003 and 2004, the production rate of large-scale EAF steelmaking in China has reached the international advanced level, and its production rate has reached the international advanced level. The electric energy consumption has been reduced to 200 to 400 kW h. The international advanced level of /t, but the actual energy-to-substance conversion efficiency level is still not high, and the EAF steelmaking energy-saving work still needs to be further improved.
Electric furnace steelmaking process requires a lot of heat. The characteristics of the unit operation level are as follows: The steelmaking electric furnace is a high-power electro-thermal energy conversion device; its process-level features are: raw material structure, energy structure and furnace type; its characteristics in the process are: The match and convergence of logistics and energy flow. The study of the energy in the EAF steelmaking process should be conducted under the premise of high productivity, high production rate and high energy utilization.
The electric furnace steelmaking is placed in the production process. In addition to the logistics matching, the energy status of the process is affected by the entire process and the upstream and downstream processes. In recent years, China has used hot molten iron as a raw material for electric furnace steelmaking, which is very favorable for the productivity, production rate, quality, and cost of EAF steelmaking. However, the overall energy consumption in the electric furnace steelmaking process is slightly reduced, the energy efficiency of the process is not improved, the advantages of “short flow” are impaired, and the emissions of room-temperature gas and pollutants per ton of steel increase.
China has the basic conditions for the development of modern electric furnace steelmaking processes. The operating level and comprehensive management level of electric furnace steelmaking has been ranked first in the world. The electric energy consumption of large-scale electric furnace steelmaking in China has reached the international advanced level. However, if the energy provided by adding molten iron is deducted, the actual energy-to-substance conversion efficiency level is still not high, and the energy-saving work for electric steelmaking in steelmaking still needs to be further improved.