As we all know, electric furnace steelmaking in the metallurgical industry is a "big electricity consumer", and the key to energy conservation and carbon reduction is to save electricity and greatly reduce carbon emissions through technological improvement. In the Baoshan base of Baosteel Co., Ltd., the low-carbon and energy-saving transformation of the round billet electric furnace is currently underway, which is expected to be completed by the end of June next year, and will save 160,000 tons of standard coal.
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The renovation project is in the electric furnace production area of Baoshan base of Baosteel Co., Ltd., which is still in production, but the scrap steel batching workshop supporting the billet electric furnace has started construction, and the Baoye Metallurgical Engineering Co., Ltd., which is responsible for the construction, adopts the process of combining "modular installation" and "prefabricated construction" to achieve "green construction" during the entire construction period.
The relevant person in charge of Baoye Metallurgical Engineering Company said: "From the start of this year to February 15 next year, the piles and workshops of the scrap batching workshop will be completed. Next year's task is to carry out an in-situ overhaul of the No. 7 and No. 8 furnaces within 135 days. During the shutdown period, the concrete structure of more than 1,000 tons is lifted as a whole by means of a large module truck, and then installed by means of module transportation. ”
Before retrofitting. No. 7 electric furnace and No. 8 electric furnace are the objects of low-carbon and energy-saving transformation of billet electric furnaces, and the age of these electric furnaces has been almost 30 years. Why does the traditional electric furnace consume high energy?Because electric furnace steelmaking needs to convert electrical energy into heat energy, a lot of energy is lost in this processIn addition, the waste and waste heat generated by electric furnace steelmaking will also take away some of the heat energy. However, as a short-process steelmaking process, electric furnace steelmaking has the advantages of high production efficiency and strong flexibility, so it is widely used in the metallurgical industry. The technical transformation of the old electric furnace is to empower the short-process steelmaking process that has been used for many years, so that it is not only efficient, but also energy-saving and low-carbon.
The relevant person in charge of the electric furnace factory of the steel pipe strip steel division of Baosteel told reporters: "There are three main technical means for the transformation, one is to complete the horizontal continuous feeding, the second is the preheating of scrap steel, and the other is waste heat." Judging from the data of the enterprise, the energy consumption of supply and demand after the transformation will be 16 kg of standard coal per ton of steel compared with that of the electric furnace before the transformation. At this level, the annual reduction in standard coal consumption is about 160,000 tons. ”
It is understood that traditional electric furnace steelmaking uses "60% scrap + 40% molten iron" as the raw material for steelmaking, and the carbon content in molten iron is relatively high. Therefore, the key to reducing carbon emissions is to reduce or stop using hot metal ingredients. In addition, what kind of electricity is used is also a major factor that affects the level of carbon emissions.
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The relevant person in charge of the electric furnace factory of Baosteel Steel Pipe and Bar Steel Division said: "Before the transformation, it did not have the conditions for full scrap smelting, but after the transformation is completed, the electric furnace will have the conditions for full scrap smelting. In the long term, it can also adopt the model of 'all scrap + all green electricity', so that the production of billet electric furnaces can achieve 'near-zero carbon emissions'. ”
Renderings. As a demonstration and landmark project of low-carbon metallurgy in the iron and steel industry, the low-carbon energy-saving transformation project of the billet electric furnace is a key project of Baosteel Co., Ltd. and Baoye Metallurgical Engineering Company, and it is also the first non-open preheating, short-process, low-carbon and energy-saving electric furnace in Baoshan base. The project started on May 22, 2023 and is scheduled to be completed and put into operation on June 28, 2024.
Recently, Shanghai Baoye Metallurgical Engineering Co., Ltd. held an open day with the theme of "practicing the mission of green and low-carbon development of iron and steel, helping low-carbon and energy-saving electric furnace to be completed and put into operation as soon as possible" in the low-carbon and energy-saving transformation project department of Baoshan base.
*: Shanghai Baoshan official WeChat.