基于F曲線的中間包流場優化

王汝棟; 蘇旺; 崔衡; 嚴進寶; 劉建華; 王福良

doi:10.13374/j.issn2095-9389.2020.03.20.s14

基于F曲線的中間包流場優化

doi: 10.13374/j.issn2095-9389.2020.03.20.s14

王汝棟¹,
蘇旺²,
崔衡^{1, 3, ,},
嚴進寶²,
劉建華⁴,
王福良²

1.
北京科技大學鋼鐵共性技術協同創新中心，北京 100083
2.
日照鋼鐵控股集團有限公司，日照 276806
3.
現代交通金屬材料與加工技術北京實驗室，北京 100083
4.
北京科技大學工程技術研究院，北京 100083

基金項目: 國家自然科學基金資助項目（U1860106）

詳細信息

通訊作者:
E-mail：cuiheng@ustb.edu.cn

中圖分類號: TF769.9
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- 被引次數: 0
出版歷程
- 收稿日期: 2020-03-20
- 刊出日期: 2020-12-25

Optimization of the tundish flow field based on F-curve

1.
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing 100083, China
2.
Rizhao Steel Holding Group Co., Ltd., Rizhao 276806, China
3.
Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, Beijing 100083, China
4.
Institute of Engineering Technology, University of Science and technology Beijing, Beijing 100083, China

More Information

Corresponding author: E-mail: cuiheng@ustb.edu.cn

摘要

摘要: 針對某廠三流異型坯中間包，建立了相似比為1∶2的水模型，使用F曲線對不同控流裝置下的中間包流場特性進行分析與優化。實驗內容包括原型控流裝置、湍流抑制器無擋壩、湍流抑制器加擋壩組合。結果表明，原型中間包中部水口存在短路流，水口間流動的差異性較大，可能導致三個鑄流的鑄坯溫度和潔凈度不均勻，進而發生同爐次各鑄坯質量穩定性差的問題。采用湍流抑制器無擋壩控流裝置，湍流抑制器導流孔夾角為60°時，短路流出現在中部；導流孔夾角為86°時，無短路流，各流一致性變好；導流孔夾角為110°時，兩側水口出現短路流，各流一致性優于前兩個角度。中間包的各流一致性與死區比例并無相關性，一致性良好的中間包流場，其死區比例并不一定小。優化后的中間包湍流抑制器導流孔夾角為110°，擋壩距離中間包中心2400 mm，中間包內無短路流，1#、2#水口一致性最佳，死區由17.89 %減小到9.67 %，減小率為11.25 %，F曲線標準差最大值由0.3減小到0.016。
- 多流中間包 /
- 異型坯 /
- 物理模擬 /
- F曲線 /
- 控流裝置
Abstract: The water model with a similarity ratio of 1∶2 was established for a three-strand beam blank tundish. The molten steel flowing character was researched in different flow control devices by using the F-curve, and the flow field of the tundish was optimized. The volume fractions of dead region, plug flow and well-mixed flow are calculated. The standard deviation of the stagnation time of 1, 2 and 3 flow and the maximum value of standard deviation function of F-curve were used to evaluate the dispersion of each flow. Three cases were considered during the experiments, i.e, prototype flow control device, turbulence inhibitor without dams combination, turbulence inhibitor and dams combination. The results show that short circuit flow exists in the middle nozzle of the prototype tundish, and poor consistency between nozzles, which may lead to the uneven temperature and cleanness of the three-strand beam blanks, leading to different quality of different beam blanks in one heat. Using the turbulence inhibitor without dams combination, the short circuit flow appears in the middle of tundish with the angle of diversion holes being 60°. When the angle is 86°, there is no short circuit flow, and the consistency between strands becomes better. When the angle is 110°, the short circuit flow appears in the two sides of the tundish nozzle with the best consistency between strands. There is no correlation between the consistency of the tundish strands and the dead volume fraction. When the consistency of the tundish strands is good, the dead volume fraction may not be small. After optimization, the angle of the diversion hole of the tundish turbulence inhibitor is 110°, the dam is 2400 mm away from the tundish center. There is no short-circuit flow, the consistency of 1# and 2# nozzles is the best, the dead volume fraction is reduced to 9.67% from 17.89%, and the reduction rate is 11.25%. The maximum standard deviation of the F-curve is reduced to 0.016 from 0.3.
- multi-strand tundish /
- beam blank /
- physical simulation /
- F-curve /
- flow control device

HTML全文

圖 1 中間包結構示意圖

Figure 1. Schematics of the tundish structure

下載: 全尺寸圖片幻燈片

圖 2 水模型實驗裝置示意圖

Figure 2. Schematics of the water model experimental device

下載: 全尺寸圖片幻燈片

圖 3 擋壩結構示意圖（單位：mm）

Figure 3. Schematics of dams in tundish (unit: mm)

下載: 全尺寸圖片幻燈片

圖 4 湍流抑制器結構示意圖

Figure 4. Schematics of the turbulence inhibitor in tundish

下載: 全尺寸圖片幻燈片

圖 5 原型中間包RTD曲線。(a) E曲線; (b) F曲線

Figure 5. RTD curves of the prototype tundish: (a) E-curve; (b) F-curve

下載: 全尺寸圖片幻燈片

圖 6 不同湍流抑制器方案下的E曲線和F曲線

Figure 6. E-curve and F-curve of different turbulence inhibitors

下載: 全尺寸圖片幻燈片

圖 7 選取控流裝置下的E曲線和F曲線

Figure 7. E-curve and F-curve of the selected flow control device

下載: 全尺寸圖片幻燈片

表 1 中間包不同控流裝置實驗方案

Table 1. Schemes of different flow control devices

Scheme	The angle of diversion holes in turbulence inhibitor/(°)	Distance between dam and tundish center/mm
A2	60	1306
A0	60	—
B0	86	—
C0	110	—
B1	86	500
B2	86	1306
B3	86	1900
B4	86	2400
C1	110	500
C2	110	1306
C3	110	1900
C4	110	2400

下載: 導出CSV

表 2 原型中間包流場特性

Table 2. Flow characteristics of scheme A2

Scheme	Dead zone ratio/%	Plug flow ratio/%	Mixed flow ratio/%	σ_1,2,3	σ_F,max
A2	20.92	8.45	70.63	13.46	0.0300

下載: 導出CSV

表 3 不同湍流抑制器流場特性

Table 3. Flow characteristics of different turbulence inhibitors

Scheme	Dead zone ratio/%	Plug flow ratio/%	Mixed flow ratio/%	σ_1,2,3	σ_F,max
A0	17.89	8.94	73.17	14.66	0.0207
B0	17.24	8.87	73.89	9.36	0.0138
C0	16.43	10.07	73.49	4.94	0.0103

下載: 導出CSV

表 4 不同控流裝置組合下流場特性

Table 4. Flow characteristics of different flow control devices

Scheme	Dead zone ratio /%	Plug flow ratio /%	Mixed flow ratio /%	σ_1,2,3	σ_F,max
Prototype	20.92	8.45	70.63	13.46	0.0300
B1	14.90	9.12	75.98	8.42	0.0044
B2	20.90	7.75	71.35	10.33	0.0047
B3	16.77	10.74	72.49	16.04	0.0185
B4	11.20	11.55	77.25	17.54	0.0148
C1	20.13	10.28	69.60	7.46	0.0122
C2	19.39	8.31	72.30	5.31	0.0108
C3	22.07	9.04	68.89	3.55	0.0047
C4	9.67	14.28	76.04	11.50	0.0162

下載: 導出CSV

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