In the first half of 2019, China's pig iron production reached 404.21 million tons, up 7.85% year-on-year. The output of pig iron from key steel enterprises accounted for 80.92% of the national iron output, an increase of 4.51% over the previous year. Other steel enterprises increased by 24.77%. The national iron output is still The trend of continuous growth, the growth rate of pig iron production of other steel enterprises is higher than that of key steel enterprises, which has reduced the concentration of iron and steel industry in China; the ratio of blast furnace fuel to steel association members has decreased, the iron grade, coal injection ratio, labor productivity and The hot air temperature has been improved, indicating that the ironmaking technology has improved; however, the utilization factor, process energy consumption, and water pollutant emissions have declined, which is a manifestation of the progress of production technology; the technical and economic indicators of the ironmaking system between enterprises have not developed. Balance, the gap is large, and the production conditions are quite different.
In the first half of 2019, there were 85 units in the iron and steel enterprises in the statistics of steel association members (iron production accounted for 80.92% of the country). Compared with the same period of last year, the statistics increased Donghai Special Steel, Guihang, Fuxin, Sambo, Donghua, Yangchun, Xinyang, Yuanli, Suxin, CITIC Pacific, Ruifeng, and Fuxing 12 units.
Basic situation of ironmaking production in China in the first half of 2019
China's pig iron production is growing.
In the first half of 2019, China's pig iron production was 40,421,200 tons, an increase of 7.85% over the same period of the previous year. 60 enterprises' iron production increased, and 25 enterprises' iron production decreased.
In the first half of 2019, there were 16 enterprises with pig iron production exceeding 5 million tons in China, see Table 1.
In the first half of 2019, the output of pig iron in nine enterprises increased by more than 20%, but the output of pig iron in 37 enterprises decreased from the previous year.
Iron ore and coke production:
In the first half of 2019, the national iron ore output was 406,942,700 tons, up 5.64% over the same period of the previous year; the imported iron ore was 490.094 million tons, down 6.90% from the previous year.
In the first half of 2019, the national coke production was 238.773 million tons, up 6.70% over the same period of the previous year, which was driven by the rise in coke prices, indicating that China's steel production is on the rise. The key steel enterprises produced 54.527 million tons of coke, accounting for 23.33% of the national coke production.
Changes in technical and economic indicators of blast furnace ironmaking:
In the first half of 2019, the iron output of the steel association members accounted for 80.92% of the national total. Some indicators of the enterprise ironmaking index statistics are missing: in the first half of 2019, among the blast furnace technical and economic indicators of the steel association members, there are 10 enterprises without fuel ratio. Data, 33 companies have no small block ratio data, and 9 companies have no labor productivity data; the steel association announced a fuel ratio of 527.39kg/t (calculated by member unit fuel ratio = coke ratio + small coke ratio + coal ratio formula) Actually, it should be 536.09kg/t; the error is 7.70kg/t, which is actually 1.74kg/t lower than the same period of the previous year; the specific technical and economic indicators are shown in Table 2.
In the first half of 2019, according to the statistics of the steel association members, there are 33 enterprises with BF-to-cylinder fuel ratio and no coke ratio. After reviewing, 10 companies reported that there is no coke ratio in the fuel ratio, and 6 enterprises have fuel. The ratio is low; 12 of the 35 companies with coke ratio data have fuel ratio values not equal to coke ratio + small coke ratio + coal ratio (Note: the coal injection ratio cannot be calculated using the conversion factor); there are 9 The company's coke ratio + small coke ratio + coal ratio data is greater than the reported fuel ratio data. The fuel ratio data of China's iron and steel enterprises should be calculated as soon as possible in accordance with the unified regulations of the state.
According to the analysis of the steel association statistics, in the first half of 2019, 40 enterprises in the steel associations had a lower blast furnace fuel ratio, and 24 enterprises had higher fuel ratios. Compared with the same period of last year, the fuel ratios decreased: Zhongtian decreased by 49.16kg/t, Daye Special Steel decreased by 22.97kg/t, Delong decreased by 28.60kg/t, Sanbao decreased by 22.54kg/t, Egang decreased by 21.86kg/t, and Chuanwei Steel decreased by 21.00kg/t. Xilin Steel dropped 19.91kg/t, Shangang Steel dropped 19.30kg/t, Xinyang Steel dropped 17.48kg/t, Bengang fell 15.87kg/t, Suxin Special Steel dropped 14.67kg/t, Taigang fell 13.9kg/t Egang decreased by 13.59kg/t, Handan Steel decreased by 13.42kg/t, Shougang decreased by 13.04kg/t, Yonggang decreased by 11.73kg/t, Xinxing Casting Pipe decreased by 10.97kg/t, and Lengshuijiang Steel decreased by 11.78kg/t. Donghai special steel fell 9.37kg / t.
In the first half of 2019, the fuels were relatively low: 477.85kg/t for Zhongtian Iron and Steel, 494.47kg/t for Sanming Steel, 487.81kg/t for Yongfeng Zibo Steel, 4495.82kg/t for Baosteel, and 499.81kg/t for Taiyuan Steel. Steel 501.63kg/t, Tangshan Steel 502.10kg/t, Shougang 503.36kg/t, Xinye Steel 503.60kg/t, Xinyang Steel 503.58kg/t, Yuanli Metal 504.22kg/t, Qinggang 505.50kg/t, CITIC Taifu 508.83kg/t, emerging cast pipe 512.12kg/t, WISCO 513.66kg/t, Yangchun Steel 515.05kg/t and so on. However, the company with the highest fuel ratio reached 567.34kg/t.
Below, the classification introduces the situation in which some iron-making enterprises reduce the fuel ratio change in the first half of 2019 (Note: due to the imbalance between the fuel ratio, coke ratio, coal ratio and other data reported by some enterprises, the following some enterprises analyze There is also an inconsistency in the data):
The coke ratio and the coal ratio decreased at the same time, and the situation of the 10 companies with the fuel ratio decreased is shown in Table 3.
The main manifestation of lowering the iron-to-fuel ratio is to reduce the coke ratio. After increasing the coal injection ratio, it is necessary to achieve a high replacement ratio of coal powder instead of coke, so that the fuel ratio will not increase. In the first half of 2019, 12 of the steel association members achieved a decrease in the coke ratio greater than the increase in the coal ratio, which led to a decrease in the iron-to-fuel ratio. See Table 4 for details.
The decrease in coal ratio is greater than the increase in coke ratio, the wind temperature is increased, and the fuel ratio is reduced. There are 4 enterprises, as shown in Table 5.
At present, when the price difference between metallurgical coke and pulverized coal is large, the blast furnace operation policy of Ninggang and other enterprises is correct, reducing the coal ratio, increasing the coke ratio, improving the gas permeability of the furnace, and promoting the blast furnace forward; The fuel ratio and production cost are reduced, and the process energy consumption is reduced.
In the first half of 2019, 24 of the steel association members had an increase in fuel ratio compared to last year. The number of companies with higher fuel ratios has decreased from the previous year, and companies with higher fuel ratios should learn from companies with lower fuel ratios. In the first half of 2019, some enterprises increased their coal ratio and coke ratio at the same time. Some enterprises increased their coke ratio more than the coal ratio. Some enterprises' coal ratios increased more than the coke ratio, which is not conducive to reducing the fuel ratio. The main reason is that the quality of the original fuel is deteriorating, or the blast furnace is in a bad state, and the coke ratio must be increased to maintain the blast furnace. Individual companies have improper handling of furnace conditions.
