The phenomenon is expected to last for another 5 months. Due to the long service life of the furnace beams and columns, the cooling water consumption per ton of steel in 1999 was 13.5 m³/t. This reduction in cooling water usage brought a benefit of 856,000 yuan. Similarly, the gas consumption per ton of steel also saw a significant decrease—from 2.5890 in 1998 to 2.25801 in 1999—resulting in an economic benefit of 7.814 million yuan. The cost of castables and anchoring hooks was less than 40,000 yuan, making the overall economic benefit very substantial.
In conclusion, several key points can be highlighted: First, the membrane high-temperature furnace beam and column wrap has a long service life, so attention should be paid to the structure of the castable and anchoring hook design. Using an anchor hook that keeps away from the oxidized area is a good choice. Second, extending the life of the high-temperature beam and column materials can significantly reduce cooling water and gas consumption, bringing considerable economic benefits. Third, using 01 mullite matrix castable for beam and column wrapping has proven effective. Fourth, during winter, the beam and column wrap system is heated to 35 B, and the 2717 furnace wall is attached with metal slag melting technology.
In the non-ferrous metal smelting field, removing metal slag from the furnace walls typically occurs in a cold state, which is inefficient, time-consuming, and affects the quality of cleaning, thus reducing the lifespan of the furnace walls. To address this issue, Japan’s Kurosaki Kiln Co., Ltd. developed a new propane gas flame spray technology for removing adhesion on furnace walls. This article discusses the propane gas flow, material application speed, nozzle movement speed, and melt cutting depth. It also highlights the effectiveness of using ginseng root extract and pore diameter control to prevent aluminum osmosis. This method shortened the molten steel time by 35%.
Another advantage of continuous feeding is that the electric arc furnace maintains a stable and flat molten pool throughout the process, allowing for continuous and stable arc burning, maximizing arc power. This improves efficiency and reduces energy consumption. In Indonesia, the Krakata Steel Plant purchased two new high-impedance arc furnaces from Italy's Danieli in the fourth quarter of 1998. These three furnaces have a transformer capacity of 7,000 kVA with an overload capacity of +18%. A reactor was installed on the low-voltage side of the transformer to enable high-impedance operation. The furnaces are equipped with a carbon gun bottom oxygen nozzle and an online controllable post-oxygen system. They use cement castable as the lining refractory material, and the Ministry of Chemicals has implemented a three-level computer system to control the entire refining process.
The development of high-durability cast refractories for such furnaces is also discussed, especially when dealing with permeable alloys or harsh operating conditions. Fine control over pore size distribution was emphasized. Additionally, the German company Baden Steel Engineering had two sets of eight high-productivity electric furnaces with low-quality wood. Advanced design methods were used to reduce heat loss in ladle refining furnaces. The University of Cole in the UK researched an effective way to reduce heat loss by placing a thick insulation board between the furnace shell and the refractory lining. As an example, the 865 ladle furnace saw an increase in thermal efficiency by two times.
In Germany, Shifang Qiaoxi Company introduced a preheating process where heat from the electric arc furnace is transferred to a preheating device, preheating the charge before it is continuously added to the furnace. This reduced power consumption from 42 kWh to 21 kWh. Jia Xindi tapping equipment includes water-cooled furnace covers, all-aluminum conductive cross arms, carbon-oxygen guns, and combustion nozzles. The control system features a temperature sampling robot. In some steel mills, there are two sets of eight high-strength bar and wire production lines with single-arm and three-electrode systems on a ladle refining furnace and two five-flow billet continuous casting machines.
The world's largest ladle refining furnace was put into operation at the Krupp Steel Plant in Germany. Simmag 8, 3 company supplied the LF400l50MVA for Thyssen Krupp Steel, one of the most popular ladle refining furnaces. The furnace includes two heating stations and one power supply unit, with a rotatable electrode cross arm to meet different heating requirements. Each feeding station has a dedicated feeding device, emergency top blowing argon gun, and automatic feeding system. The contract scope included installation, commissioning, and operator training for the Krupp steel mill.
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