Study on the Pneumatic Lime Injection in the Electric Arc Furnace Process: An Evaluation on the Performance Benefits,Steel Research International

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Study on the Pneumatic Lime Injection in the Electric Arc Furnace Process: An Evaluation on the Performance Benefits
Steel Research International ( IF 1.9 ) Pub Date : 2021-04-24 , DOI: 10.1002/srin.202100083
Davide Mombelli ₁ , Gianluca Dall'Osto ₁ , Giacomo Villa ₁ , Carlo Mapelli ₁ , Silvia Barella ₁ , Andrea Gruttadauria ₁ , Lorenzo Angelini ₂ , Christian Senes ₂ , Massimiliano Bersani ₂ , Piero Frittella ₂ , Roberto Moreschi ₃ , Roberto Marras ₃ , Giorgio Bruletti ₃

Affiliation

The pneumatic lime injection during the electric arc furnace (EAF) process by insufflation lances mounted on the furnace walls has gained much interest in the latest years. The main advantages, in comparison to the traditional procedure of lime lumps addition within the scrap bucket, can be summarized in raw materials consumption reduction, foaming benefits, operational cost benefits, and improvement in environmental aspects. In the proposed work, the advantages of a new lime injection system developed by Unicalce S.p.A. and installed on a 90 t EAF of Acciaierie di Calvisano are analyzed. Data from more than 1200 heats are acquired and compared with the traditional practice from an energetically and emissions point of view. To evaluate the benefits on the slag foamability, several slag samples, taken at the beginning and at the end of refining stage, are analyzed through isothermal solubility diagrams (ISDs). The ISD analysis results are then compared and validated with the total harmonic distortion (THD) of the arc in the corresponding heat. The upgrade to lime injection drives to considerable savings in electrical consumptions, oxygen, methane, and lime, with an overall save of more than 4,000 t year⁻¹ of equivalent CO₂.

中文翻译：

电弧炉过程中气动注石灰的研究：性能效益评估

近年来，通过安装在炉壁上的吹气喷枪在电弧炉 (EAF) 工艺过程中进行气动石灰喷射引起了广泛关注。与传统的在废料桶内添加石灰块的程序相比，其主要优势可以概括为原材料消耗减少、发泡效益、运营成本效益和环境方面的改善。在拟议的工作中，分析了由 Unicalce SpA 开发并安装在 Acciaierie di Calvisano 的 90 吨 EAF 上的新型石灰喷射系统的优点。获取了 1200 多个热量的数据，并从能量和排放的角度与传统做法进行了比较。为了评估对渣发泡性的好处，几个渣样品，在精炼阶段的开始和结束时，通过等温溶解度图 (ISD) 进行分析。然后将 ISD 分析结果与相应热量中电弧的总谐波失真 (THD) 进行比较和验证。升级至注石灰可显着节省电耗、氧气、甲烷和石灰，年总节省超过 4,000 吨^-1的等价CO ₂。

更新日期：2021-04-24

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