Numerical simulation of multiphase flow induced by bottom blowing limestone powder in converter steelmaking

IF 4.5 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2024-10-17 DOI:10.1016/j.powtec.2024.120369

Kaixuan Zhang , Shuhuan Wang , Chenxiao Li , Zhipeng Yuan , Yanchao Zhang

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Abstract

A full-scale three-dimensional model of a 120 t steel converter was established to evaluate the effects of bottom-blown limestone particle injection speed, diameter, and nozzle location on the particle distribution and molten metal flow field using numerical simulations. The results indicated that a particle injection speed of 6 m/s, particle diameter of 0.5 mm, and injection nozzle location at 1/2 of the converter bottom radius provided the longest particle residence time and largest quantity of particles in the molten metal. Furthermore, the use of these parameters produced within the molten metal an obvious particle concentration along the centerline of the converter, the fastest average liquid metal–particle flow velocity, and moderate splashing. These optimal injection parameters created favorable kinetic conditions for the dephosphorization reaction essential to steelmaking. This study provide a theoretical basis for realizing the improved efficiency associated with the use limestone instead of lime in practical steel production.

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转炉炼钢中底吹石灰石粉引发的多相流数值模拟

建立了一个 120 吨炼钢转炉的全尺寸三维模型，通过数值模拟评估了底吹石灰石颗粒喷射速度、直径和喷嘴位置对颗粒分布和熔融金属流场的影响。结果表明，颗粒喷射速度为 6 m/s、颗粒直径为 0.5 mm、喷嘴位置为转炉底部半径的 1/2 时，颗粒在熔融金属中的停留时间最长、颗粒数量最多。此外，使用这些参数后，熔融金属中的颗粒沿转炉中心线明显集中，液态金属-颗粒平均流速最快，飞溅程度适中。这些最佳喷射参数为炼钢所必需的脱磷反应创造了有利的动力学条件。这项研究为在实际钢铁生产中使用石灰石代替石灰提高效率提供了理论依据。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.