Chinese steel output is increasing day by day, and the growth rate is very fast. However, the proportion of electric furnace steel is not large.
Chinese steel output is increasing day by day, and the growth rate is very fast. However, the proportion of electric furnace steel is not large. Most of them are converter steel, which consumes a large amount of scrap, resulting in a shortage of scrap resources, which restricts the development of electric furnace steelmaking. Here is an introduction to the development status and prospects of electric furnace steelmaking in China.
1. Development status of electric furnace steelmaking in China
(1)Large electric furnace capacity
China has realized large-scale electric furnace capacity, forming a modern electric furnace process group of electric furnace smelting - external refining - continuous casting or electric furnace smelting - external refining - continuous casting - continuous rolling. In 1992, electric furnaces in China were basically small ones, with an average furnace capacity of 4.6 tons / set. At present, China has 36 large electric furnaces of 60 to 150 tons, and the steel output of large electric furnaces accounts for about 61% of the total output of electric furnaces. Large electric furnace adopts advanced and intensive technology, which can realize high voltage, long arc and low current operation, with reasonable process, high production efficiency and low consumption.
(2)Improvement of economic index of electric furnace steelmaking
The technical and economic indicators of electric furnace steelmaking production in China have been greatly improved. Many steel mills have entered the international advanced or even international ranks in terms of smelting cycle, power consumption, utilization coefficient and productivity. The progress of induction furnace steelmaking technology has promoted the expansion and development of electric furnace steel production scale in China. In the past two years, under the unfavorable conditions of shortage of scrap and power resources, high price and higher cost than converter steel, the output of electric furnace steel in China has increased significantly, the proportion of electric furnace steel has picked up, and the growth rate of electric furnace steel is slightly higher than the growth rate of total steel production.
(3)Innovation of electric furnace smelting technology
China has made some innovations on the basis of digesting and attracting foreign advanced electric furnace smelting technology. Some innovations have promoted the rapid development of China's modern electric furnace steelmaking technology and electric furnace steel production. For example, the high efficiency and comprehensive energy-saving technology of electric arc smelting cycle, the rationalization technology of electric arc furnace plus steelmaking waste structure, the waste heat utilization technology, the enhanced oxygen and energy supply technology of electric furnace smelting, the control technology of electric furnace steelmaking, etc.
2.Development prospect of electric furnace steelmaking in China
(1)Own manufacturing capacity
Most of the high-end and advanced electric furnace equipment of China's iron and steel enterprises are imported from abroad. There are two reasons for this: on the one hand, there is a certain gap between China and China in terms of the manufacturing capacity of electric furnace equipment and the degree of automation of electric furnace equipment. On the other hand, under the influence of the idea of recovering investment in a relatively short time and making profits as soon as possible, iron and steel enterprises are unwilling to make venture capital. As a result, China's electric furnace design, R & D and manufacturing units rarely get the funds used by iron and steel enterprises for electric furnace research and development, which is also a common problem in other equipment fields in China. The solution to this problem depends on the iron and steel enterprises to change their ideas, but ultimately depends on the improvement of our own manufacturing capacity.
(2)Comprehensive energy consumption of electric furnace steelmaking
The comprehensive energy consumption of electric furnace steelmaking in China is on the high side and has not yet reached the international advanced level. Although the economic and technical indicators of China's electric furnace steelmaking in all aspects have reached the international advanced level, the technical and economic indicators of China's electric furnace steelmaking are not optimistic if measured according to the standard of all cold charging charges.
(3)Direct reduced iron index
As one of the raw materials of electric furnace steel in China, the quality index of direct reduced iron is poor. Due to the lack of natural gas resources in China, most of the direct reduced iron is produced by coal based method. The ash and sulfur content in coal is high, resulting in the index of direct reduced iron is not very good.
(4)Utilization of waste heat from electric furnace steelmaking
Although China has made some progress in the waste heat utilization of electric furnace steelmaking, there are still many problems that need to be further studied. For example, the chemical heat utilization of electric furnace steelmaking still needs further research. In the process of electric furnace steelmaking, nearly 2/3 of the energy generated during the final generation of carbon dioxide from carbon and oxygen has not yet been recycled.
(5)End point control of electric furnace smelting
China also needs to continue to conduct in-depth research on the end point control of electric furnace smelting in the process of electric furnace smelting, so as to make the smelting process more accurate. In addition, the effective control of harmful elements in electric furnace smelting is also a subject that needs to be paid attention to in the future.
The above is an introduction to the development status and prospects of electric furnace steelmaking in China. Electric furnace steelmaking is a relatively clean steelmaking method, with low energy consumption and low environmental load in the steelmaking process, which should be given enough attention and development. Shennai technology intermediate frequency electric furnace has core technology, integrating electric furnace R & D, production and sales. It can customize intermediate frequency furnaces for different manufacturers at home and abroad. You are welcome to leave a message or call for details.