According to statistics, in 2005, there were 18 enterprises with a crude steel output of more than 5 million tons in China, accounting for only 46.36% of the total crude steel in the country. In 2004, 73.22% of the total crude steel in Japan was completed by 4 companies, and 3 companies in the United States. Steel production accounts for 61.09% of the country's total. Russia's 78.69% of steel production is produced by five steel companies, while South Korea's two steel companies account for 82% of the country's total steel production. China has 871 iron and steel enterprises with iron and steel production capacity. In 2005, crude steel output was 352.39 billion tons, an increase of 174.2% from 128.5 million tons in 2000, but it was mainly expanded by enterprises in situ or in different places. The scale of operation is completed, and the steel group (8 pieces) with a production capacity of 10 million tons produces 105.4 million tons of steel, accounting for only 30.2% of the national steel output, and 18 enterprises with more than 5 million tons. 47% of the national total. [2]
2. There is a clear gap between the large-scale equipment of iron and steel enterprises and developed countries.
According to the statistics of China Iron and Steel Association, at the end of 2004, there were 1,131 blast furnaces in China, 18 blast furnaces of 1 000 m3 and above, and the production capacity accounted for 31.96% of the total capacity; the rest were small blast furnaces below 1 000 m3, accounting for production capacity. 68.04% of the total production capacity. At the end of 2004, there were 553 steel-making converters in China, only 3 converters with more than 300 tons, and 51 converters with 120 to 299 tons. The production capacity accounted for 2.17% and 22.57% of the total capacity respectively. 499, its production capacity accounted for 75.26% of the total capacity. In recent years, there has been considerable progress in the large-scale equipment. By 2007, the number of large-scale ironmaking blast furnaces above 1,000 m3 has increased to 120, and the number of steel-making converters above 100 t has increased to 140. [3] However, it still only accounts for about 10% of the total number of equipment. In terms of large-scale production of metallurgical equipment, China's steel industry in developed countries there is a large gap.
3. Secondary resource recycling rate is low
The traditional steel production process consumes a lot of energy, and almost every production process is repeatedly heated, causing a large loss of heat. It is reported that 716kgce is consumed for every 1 t of steel produced, and the effective energy utilization rate in the production process is 27%. 73% of the thermal energy is lost in each process. [2] 44% of the heat is smoke. The form exists and contains a very high calorific value.
4. The penetration rate of energy-saving technologies and equipment is low, and the energy consumption is large.
End of 2006 and medium-sized enterprises statistics steel, blast furnace top coal gas installation a few blocks TRT device (TRT), and only 31% of the total; installation of blast furnace gas recovery unit, accounting for 77% of the total; install converter Converters for gas recovery units accounted for 64% of the total; converters for the installation of converter waste heat recovery units accounted for 68% of the total. [3] Therefore, the energy consumption index of the whole industry in China's steel industry lags behind the international advanced level, and the energy consumption levels among enterprises vary widely.
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