Comparison between fully enclosed and semi-enclosed electric arc furnaces – the following points are summarized; friends, please add more

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1. Due to the high temperatures at the surface of the materials used in the production of ferrosilicon and industrial silicon, which can lead to crust formation, it is necessary to carry out furnace ramming operations to improve ventilation conditions and allow the CO gas generated during the reduction process to be discharged smoothly. As a result, there are currently no successful examples of fully enclosed electric furnaces for the production of ferrosilicon and industrial silicon in China. It is said that the technologies of companies abroad such as Eken in Norway represent the highest level of electric furnace technology for ferroalloys in the world today. Rotating furnace bodies were once used to make electric furnaces for the production of ferrosilicon and industrial silicon fully enclosed. A company in Maoxian County, Sichuan, attempted to build and operate a 30,000 kVA electric furnace for industrial silicon, but there has been no further news regarding its long-term stable operation yet! 2. The amount of flue gas generated by semi-enclosed electric furnaces is roughly 50 times that of fully enclosed electric furnaces. This is mainly due to the open furnace doors in semi-enclosed furnaces, which allow a large amount of cold air to mix in. Additionally, the CO gas produced during the reduction process burns into CO2 when it comes into contact with air at the surface of the material. Therefore, semi-enclosed furnaces produce only flue gas. Due to the high temperature, the physical heat contained in this gas can be utilized, but there is no chemical heat release (as occurs when CO burns to form CO2). The large volume of flue gas results in a large footprint for the flue gas purification and dust removal systems, as well as higher investment costs