120 t复吹转炉底枪布置优化

张岭; 于波; 钟良才; 王立新; 贺龙龙; 翁莉; 李强

doi:10.7513/j.issn.1004-7638.2022.05.020

120 t复吹转炉底枪布置优化

doi: 10.7513/j.issn.1004-7638.2022.05.020

张岭^{1, 2},
于波³,
钟良才^{1, 2, ,},
王立新³,
贺龙龙^{1, 2},
翁莉³,
李强^{1, 2}

1.
东北大学多金属共生矿生态化冶金教育部重点实验室, 辽宁沈阳 110819
2.
东北大学冶金学院, 辽宁沈阳 110819
3.
建龙集团抚顺新钢铁炼钢厂, 辽宁抚顺 113001

基金项目: 中央高校基本科研业务专项资金资助（N2125018）；国家自然科学基金项目（51574069）；科技部国家重点研发计划资助项目（2017YFB0304100）

详细信息

作者简介:
钟良才，1958年出生，男，广西钟山人，博士，教授，通讯作者，研究方向：转炉炼钢，E-mail：zhonglc@mail.neu.edu.cn

通讯作者:
钟良才，1958年出生，男，广西钟山人，博士，教授，通讯作者，研究方向：转炉炼钢，E-mail：zhonglc@mail.neu.edu.cn

中图分类号: TF713.1
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出版历程
- 收稿日期: 2022-05-09
- 刊出日期: 2022-11-01

Bottom tuyere configuration optimization in 120 t combination blown converter

Zhang Ling^{1, 2},
Yu Bo³,
Zhong Liangcai^{1, 2
, ,},
Wang Lixin³,
He Longlong^{1, 2},
Weng Li³,
Li Qiang^{1, 2}

1.
Key Laboratory of Ecological Metallurgy of Multi-metal Symbiosis Ore, Ministry of Education, Northeastern University, Shenyang 110819, Liaoning, China
2.
School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
3.
Jianlong Fushun New Iron and Steel Plant, Fushun 113001, Liaoning, China

摘要

摘要: 以120 t顶底复吹转炉为原型，依据相似原理在实验室利用几何相似比为1:10的模型开展了物理模拟试验，研究了氧枪枪位、底枪支数和布置、供气流量等因素对转炉熔池搅拌混匀的影响；建立了转炉纯底吹气液两相流模型，研究了不同底枪方案对熔池速度场的影响。结果表明：底吹流量为0.534 m³/h和1.074 m³/h的纯底吹时，4~8支底枪的最佳布置方案的混匀时间平均值分别为28.50、28.25 s和27.50 s；复吹时，对于8支底枪的最佳布置方案，顶吹流量为122 m³/h，不同氧枪枪位下熔池混匀时间随底吹流量的增大而降低，最佳枪位在200~230 mm。通过数学模拟研究了物理模拟试验得到的最佳4、6、8支底枪布置方案的速度场，发现底吹时水平截面流场的涡心个数少，垂直截面流场涡心不对称程度大时，可降低“死区”体积，从而提高底吹气体的搅拌能力，使熔池的混匀时间降低。底吹流量为1.074 m³/h时，研究的4、6、8支最佳底枪布置方案的死区体积比分别为15.44%、23.56%和10.30%。
- 转炉 /
- 顶底复吹 /
- 熔池 /
- 搅拌混匀 /
- 流体流动 /
- 物理模拟 /
- 数学模拟
Abstract: Physical experiment in a model with a geometric similarity ratio of 1:10 for a 120 t top-bottom combined blown converter based on the similarity theory was conducted in laboratory. The effect of bottom gas flowrate, number and arrangement of bottom tuyeres on the bath mixing was studied. A mathematical model of gas-liquid two-phase flow in the converter at single bottom blowing was established in the simulation. The effect of bottom tuyere configurations on velocity field in molten bath was studied. The results showed that the average mixing time with the optimized configurations of 4, 6 and 8 bottom tuyeres at bottom gas flow rate of 0.534 m³/h and 1.074 m³/h is 28.50, 28.25 s and 27.50 s in the case of single bottom blowing. In the case of combined blowing, the mixing time in the molten bath decreases with increase in bottom gas flow rates with the optimized configuration of 8 bottom tuyeres at top gas flow rate of 122 m³/h under different top lance heights. The velocity fields in the bath with the optimized configurations of 4, 6 and 8 bottom tuyeres were investigated in the mathematical simulation. It is found that less vortex centers of flow fields on horizontal sections and large asymmetry of vortex centers of flow fields on vertical sections can decrease “dead zone” volumes, which can improve the stirring ability of bottom gas and reduce mixing time in molten bath. The “dead zone” volumes in molten bath from the optimized configurations of 4, 6 and 8 bottom tuyeres studied here are 15.44%, 23.56% and 10.30%, respectively.
- converter /
- top and bottom blow /
- bath /
- stirring and mixing /
- fluid flow /
- physical modeling /
- mathematical simulation

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图 1 试验装置示意

Figure 1. Schematic of experimental apparatus

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图 2 模型转炉底枪开孔位置及编号

Figure 2. Position and numeration of bottom tuyeres in the model converter

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图 3 熔池计算区域和网格划分

Figure 3. Computational zone and meshing in the molten bath

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图 4 数学模拟的底枪布置方案

Figure 4. Bottom tuyere configurations in mathematical simulation

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图 5 底枪布置方案8-18在顶吹流量为122 m³/h时不同氧枪高度的混匀时间

Figure 5. Mixing time in molten bath with different oxygen lance heights at top gas flow rate of 122 m³/h for case 8-18

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图 6 底枪布置方案6-6数值模拟混匀时间

Figure 6. Mixing time in mathematical simulation with case 6-6

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图 7 不同底枪布置方案物理模拟与数值模拟混匀时间对比

Figure 7. Comparison of mixing time between physical and mathematical simulations in different bottom tuyere configurations

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图 8 不同布置方案熔池水平截面的流体流动

Figure 8. Streamlines of different bottom tuyere configurations on different horizontal section in the molten bath

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图 9 不同布置方案耳轴截面的速度矢量

Figure 9. Velocity fields of different bottom tuyeres configurations at trunnion section

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图 10 不同布置方案垂直耳轴截面速度云图

Figure 10. Velocity contours vertical to trunnion direction with different bottom tuyere configurations

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图 11 底吹流量为1.074 m³/h不同布置方案熔池死区

Figure 11. Dead zone in the molten bath with different bottom tuyere arrangements with bottom gas rate of 1.074 m³/h

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表 1 原型转炉与模型转炉的主要参数

Table 1. Main parameters of prototype converter and model converter

	熔池直径/mm	熔池深度/mm	氧枪喷头孔数/孔	氧枪喷头喷孔夹角/(°)	顶吹气体流量/（m³·h⁻¹）	底吹气体流量/(m³·h⁻¹)
原型	5380	1410	5	15	37200	465/930/1395/1860
模型	538	141	5	15	122	0.216/0.534/1.074/1.608/2.142

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表 2 4支底枪布置方案

Table 2. Arrangements of 4 bottom tuyeres

布置方案	底枪编号	布置方案	底枪编号
4-1	B(2-5-10-13)	4-9	B(5-12)-C(3-10)
4-2	B(3-6-9-12)	4-10	C(5-12)-D(3-10)
4-3	A(5-12)-B(3-10)	4-11	A(6-13)-B(4-11)
4-4	A(5-13)-B(2-10)	4-12	B(6-13)-C(4-11)
4-5	A(6-14)-B(4-10)	4-13	A(4-11)-B(2-9)
4-6	A(5-13)-B(3-9)	4-14	B(4-11)-C(2-9)
4-7	B(3-6-10-13)	4-15	B(3-5-10-12)
4-8	B(2-6-10-12)

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表 3 6支底枪布置方案

Table 3. Arrangements of 6 bottom tuyeres

布置方案	底枪编号	布置方案	底枪编号
6-1	A(5-12)-B(3-10)-C(4-11)	6-9	A(5-12)-B(3-10)-C(1-8)
6-2	A(5-12)-B(3-10)-D(4-11)	6-10	A(5-12)-B(2-9)-C(4-11)
6-3	A(5-12)-B(3-10)-C(6-13)	6-11	A(5-12)-B(3-9)-C(4-11)
6-4	A(5-12)-B(3-10)-D(6-13)	6-12	A(5-12)-B(2-10)-C(4-11)
6-5	A(5-12)-B(3-10)-C(7-14)	6-13	A(5-13)-B(3-10)-C(4-11)
6-6	A(5-12)-B(3-6-10-13)	6-14	A(6-12)-B(3-10)-C(4-11)
6-7	A(5-12)-B(3-10)-C(2-9)	6-15	A(5-12)-B(2-6-9-13)
6-8	A(5-12)-B(3-10)-D(2-9)	6-16	A(6-13)-B(3-10)-C(4-11)

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表 4 8支底枪布置方案

Table 4. Arrangements of 8 bottom tuyeres

布置方案	底枪编号	布置方案	底枪编号
8-1	A(6-12)-B(3-10)-C(4-6-11-13)	8-15	A(5-12)-B(2-10)-C(4-6-8-11)
8-2	A(6-12)-B(3-10)-C(4-7-11-13)	8-16	A(5-12)-B(2-10)-C(1-4-8-11)
8-3	A(6-12)-B(3-10)-C(4-6-11-14)	8-17	A(5-12)-B(3-6-10-13)-C(4-11)
8-4	A(6-12)-B(3-10-14)-C(4-6-11)	8-18	A(5-12)-B(3-6-10-13)-C(4-12)
8-5	A(6-12)-B(3-10)-C(2-4-9-11)	8-19	A(5-12)-B(3-6-10-13)-C(5-11)
8-6	A(6-12)-B(3-10)-C(1-4-9-11)	8-20	A(5-12)-B(3-6-10-13)-C(5-12)
8-7	A(6-12)-B(3-10)-C(2-4-8-11)	8-21	A(5-12)-B(1-3-6-8-10-13)
8-8	A(6-12)-B(3-8-10)-C(2-4-11)	8-22	A(5-12)-B(3-6-10-13)-C(2-9)
8-9	A(5-12)-B(2-10)-C(4-6-11-13)	8-23	A(5-12)-B(3-6-10-13)-C(1-9)
8-10	A(5-12)-B(2-10)-C(4-7-11-13)	8-24	A(5-12)-B(3-6-10-13)-C(2-8)
8-11	A(5-12)-B(2-10)-C(4-6-11-14)	8-25	A(5-12)-B(3-6-10-13)-C(1-8)
8-12	A(5-12)-B(2-10-13)-C(4-6-11)	8-26	A(1-5-8-12)-B(3-6-10-13)
8-13	A(5-12)-B(2-6-10)-C(4-11-13)	8-27	A(5-12)-B(3-6-10-13)-D(4-11)
8-14	A(5-12)-B(2-10)-C(4-6-9-11)	8-28	A(5-12)-B(3-6-10-13)-C(7-14)

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