转炉吹炼后期搅拌脱氧数学模型研究

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"Mathematical model of deoxidization with post stirring in a combined blowing converter (2010年)"，这篇论文探讨了在转炉冶炼过程中，通过后吹搅拌提高碳氧反应，降低终点钢水中溶解氧含量，从而改善钢水纯净度的数学模型。在钢铁生产中，转炉冶炼是关键步骤之一，而终端钢水中溶解的氧气是形成氧化夹杂物的主要原因。这些氧化物夹杂会严重影响钢材的质量，特别是其洁净度。论文"Mathematical model of deoxidization with post stirring in a combined blowing converter"针对这一问题进行了深入研究。作者Jie Feng、Yan-ping Bao、Xun Wu和Heng Cui来自中国科学技术大学北京工程研究所和河北科技大学材料科学与工程学院。论文指出，传统转炉冶炼的末端，钢水中的高氧含量会导致钢质不纯，不利于后续的加工和最终产品的性能。为了解决这个问题，他们提出了一种创新方法——在联合吹炼转炉中采用后吹搅拌技术。后吹搅拌可以促进钢液中的碳-氧反应，加速氧气的消耗，从而降低终点时钢水中的溶解氧含量。后吹搅拌技术涉及流体力学、传质和化学反应等多个领域，因此建立其数学模型至关重要。该模型能够量化搅拌对碳氧反应速率的影响，预测搅拌条件下的钢水脱氧效果，为实际生产过程提供理论指导。通过模型，研究人员可以优化搅拌参数，如搅拌强度、时间以及搅拌器的设计，以达到最佳的脱氧效果，提高钢材的纯净度。论文的发表对于理解和改进钢铁冶炼工艺具有重要意义，它不仅提供了关于如何利用后吹搅拌降低钢水含氧量的理论依据，也为实际工厂操作提供了实用的优化建议。同时，这项研究也反映了在工程技术领域，如何通过数学建模来解决实际工业问题，展示了跨学科合作在提升工业生产效率和产品质量上的价值。

International Journal of Minerals, Metallurgy and Materials

Volume 17, Number 5, October 2010, Page 541

DOI: 10.1007/s12613-010-0355-z

Corresponding author: Yan-ping Bao E-mail: baoyp@ustb.edu.cn

Mathematical model of deoxidization with post stirring in

a combined blowing converter

Jie Feng

1,2)

, Yan-ping Bao

, Xun Wu

, and Heng Cui

1) Engineering Research Institute, University of Science and Technology Beijing, Beijing 100083, China

2) School of Materials Science and Engineering, Heibei University of Science and Technology, Shijiazhuang 050035, China

(Received: 3 November 2009; revised: 27 November 2009; accepted: 5 December 2009)

Abstract: Dissolved oxygen in the steel at the terminal of the converter smelting process is the main cause for the formation of oxide inclu-

sions, and the high terminal oxygen content worsens the steel cleanness. However, post stirring in a combined blowing converter can pro-

mote the carbon-oxygen reaction in the liquid steel and reduce the dissolved oxygen content at the terminal of the converter smelting process.

Thus, the mathematical model of deoxidization in the post stirring process was obtained, and the rationality of which was further verified by

industrial tests. Finally, it is concluded that the product of dissolved carbon and oxygen, i.e. w

[C]

·w

[O]

, decreases obviously after adopting the

new technique of post stirring in the combined blowing converter.

Keywords: steelmaking; converter; deoxidization; mathematical model

1. Introduction

The cleanliness of steel is one of the most important in-

dicators, which implies the general quality level as well as

the internal quality of steel products; however, the cleanli-

ness is always assessed via the total quantities, forms and

sizes of nocuous elements and nonmetallic inclusions. At

the terminal of the smelting process, dissolved-oxygen in a

molten pool of a converter is one of the causes that lead to

the formation of internal oxide [1-2]. Therefore, how to de-

crease the dissolved oxygen content in the molten steel is

indispensable for improving the production efficiency and

for the steel cleanness at the converter smelting terminal

[3-4]. To meet the requirements for smelting, the post stir-

ring process, in which the inert gas is blown from the bot-

tom of the converter after stopping blowing oxygen, is

adopted for about a few minutes with the oxygen lance in

the late stage of converter smelting [5-6]. The post stirring

process can promote the carbon-oxygen reaction which fur-

ther decreases the oxygen content and the product of dis-

solved [C] and [O] [7-8], lighten the over oxidation of liquid

steel, and promote the alloy yield [9].

The deoxidization mathematical model of post stirring

was established based on the thermodynamics principles and

the dynamics principles of deoxidization by stirring liquid

steel with argon bubbles, then the model was industrially

tested, and the rationality of the model was verified. It is

also proved that the post stirring process has the metallurgi-

cal functions of deoxidation and lowering the product of

dissolved carbon and oxygen, i.e. w

[C]

·w

[O]

, in liquid steel

significantly.

2. Derivation of the deoxidization mathematical

model of post stirring

At the terminal of the converter smelting process, the

carbon-oxygen reaction in the molten steel cannot achieve

the thermodynamics balance owing to the limit of dynamics

[10], which causes higher w

[C]

·w

[O]

. However, argon bubbles

through bottom blowing can not only be used to stir the

molten steel but also be used as crystal nucleus. These bub-

bles are equivalent to small vacuum cells, the reaction be-

tween carbon and dissolved oxygen takes place on the in-

terface of bubbles and liquid steel, and it is easy for CO

produced to enter the bubbles from the reaction. Thus, the

bubbles promote the carbon-oxygen reaction further, and

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