The sinter used before December 1998 was all soil burning, the yield was low, the alkalinity was low and unstable, and the FeO content was as high as 25%, so the corresponding raw flux must be added. In December 1998, with the production of 24m2 sintering machine, part of the soil was replaced by machine burning. In April 1999, the second phase of coking was completed and put into operation. Some of the purchased coke was replaced by the factory coke, but it still needs to be added with certain limestone or white clouds. However, with the improvement of clinker rate and the improvement of coke quality, the technical and economic indicators of the blast furnace have been improved accordingly. With the commissioning of the 28.5m2 sintering machine for the second phase of the sintering process, the output of the sinter was greatly improved. Therefore, on May 9, 2000, the soil was burned to the squash pellet base. At this time, the charge structure was: 90%. Sinter + 10% raw ore. In August 2000, the ricket pellet project was completed and put into production. Due to the low alkalinity and high grade of the pellet, the structure of the charge at this time is: 80% machine burn + 20% (pellet mine + raw ore). The clinker rate has also been greatly improved, and the technical and economic indicators of the blast furnace have also reached a new level. In May 2001, the third phase of Coking Project was put into operation. The proportion of coke used in the factory increased to 90%, and the stability of coke was greatly guaranteed. This gave the blast furnace high-yield coke and added new vitality. In recent years, due to the greatly improved clinker rate, improved coke quality, enhanced screening work, optimized furnace material structure, the technical and economic indicators of the blast furnace have grown steadily and rapidly. In recent years, the iron and steel plant has been paying attention to the use of high air temperature. The top-fired ball-type hot blast stove was tried on some medium and small blast furnaces in China very early. With the improvement of the bag dust removal technology, the hot blast stove has developed rapidly. It has the advantages of fast furnace construction, large heat storage area, fast furnace, high wind temperature and long air supply time. Therefore, it has been adopted by many steel plants. There are 7 hot blast stoves in the ironworks, among which: 200m3 blast furnace has 3 top-fired hot blast stoves, the heat storage area is 29595m2, and the effective volume of blast furnace is 145.78m2/m3. The 318m3 blast furnace has top-burning hot air. The furnace 4 has a heat storage area of ​​39,264 m2 and the heating area of ​​the blast furnace effective volume is 123.472 m2/m3.
The 200m3 blast furnace hot blast stove uses a separate heat pipe Heat Exchanger; the 318m3 blast furnace hot blast stove uses an integral heat pipe heat exchanger. The dust removal equipment has 3 sets of gravity dust remover, 10 sets of bag dust removal, and 2 sets of bag dust removal system, each equipped with a screw conveyor. Each hot blast stove has two combustion chambers, which adopt a cross-parallel air supply system. In recent years, the ironworks has paid attention to the quality of fireballs and replaced them in time, and at the same time improved the combustion chamber, so that the wind temperature has increased significantly year by year. The use of blast furnace high air temperature is beneficial to production, but at the same time it brings serious damage to the corresponding air supply system. Therefore, when selecting these supporting equipment, it is necessary to select high-quality equipment with high bearing capacity. The large ore batch is filled into the furnace and distributed in the funnel. Due to the different ore and coke pile angles, the distribution in the furnace is different, but as the batch weight increases, the edge-to-center phase difference is reduced. The charge distribution tends to be uniform. The ratio of the thickness of a batch of charge to the edge and the center is the characteristic number of the batch weight. It is represented by Dp. The smaller the batch weight is, the larger the Dp is. The larger the batch weight is, the more stable the Dp is. Therefore, with the increase of smelting intensity, the No. 3 blast furnace increased the batch from 9.8t to 14t on July 18, 2000, and changed the same package into a sub-package. When the capacity of the wind turbine has not changed, the mining batch has gradually increased, and the maximum has reached 18.9t. The No. 3 blast furnace has been packed with large mines, the output has increased, the gas distribution has been improved, and various technical and economic indicators have been greatly improved. Following the No. 2 blast furnace, the same charging system has been adopted and good results have been achieved.
Expanding the capacity of wind turbines The first half of 2001 was the fastest-growing stage of the ironworks. When the quality of the original fuel was greatly improved, the capacity of the original wind turbine could not keep up with the production needs. On the 24th of 2001, the No. 3 blast furnace switched the original No. 3 fan (D900m3/min) to the newly purchased No. 4 fan (D1300m3/min). In order to ensure the rationality and stability of the air supply system, it is appropriate to explore and Expanding the size of the tuyere, the size of the tuyere is quickly adjusted to be consistent with the air supply system, thus fully demonstrating that there is iron in the wind and has achieved good technical and economic indicators. After the successful operation of No. 3 blast furnace in No. 2 blast furnace, the original No. 1 fan (D800m3/min) was switched to the No. 3 fan (D900m3/min) used in No. 3 blast furnace, and the effect was also obvious.
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