Research on multi-condition synchronous heating of titanium billet in large billet heating furnace
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摘要: 钛由于其具有各种优异的性能，被广泛应用于国防及民用领域。高效、低成本地连续生产大卷重钛带卷，利用常规热连轧生产线进行钛、钛合金-钢共线生产是大卷重钛带卷生产的发展趋势。对于钢-钛共线轧制热轧钛带卷，加热是关键环节。在某1 450 mm热带钢连轧线基础上，针对钛带卷生产效率低、加热能耗大等问题，通过ANSYS有限元建立钢坯加热炉实体模型，Fluent仿真得到加热炉内温度场和流场，分析了钛板坯在加热炉中不同阶段的温度分布，成功突破了大型钢坯加热炉多炉况同步加热钛坯技术，实现了钛带卷的高效高质量生产。Abstract: Titanium is widely used in national defense and civil fields due to its various excellent properties. In order to continuously produce large coils of heavy titanium strip with high efficiency and low cost, conventional hot tandem rolling production lines for co-linear production of titanium, titanium alloys and steel are the development trend. For steel-titanium co-linear rolling of hot-rolled titanium coil, reheating is the key step. Based on the 1 450 mm hot strip rolling line, in order to solve the problems of low efficiency and high energy consumption of titanium coils, a solid model of the billet heating furnace through ANSYS finite element had been developed to analyze the fluid conditions in the furnace through Fluent simulation calculation. The temperature distribution of titanium slab at different stages in the reheating furnace under optimal air-fuel ratio had been studied. The technology of synchronously reheating titanium billets in large billet reheating furnaces had been well established from this research and successfully been used to achieve efficient and high-quality production of titanium coils.
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Key words:
- titanium coil /
- steel-titanium collinear rolling /
- finite element /
- air-fuel ratio
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图 3 TA1导热系数、比热容随温度的变化曲线
Figure 3. Variation of thermal conductivity and specific heat of TA1 with temperature
图 8 加热炉炉长方向上测量温度与计算温度对比
Figure 8. Comparison between calculated temperature and field temperature
图 9 不同空燃比下加热炉各段沿炉宽方向上温度分布情况
Figure 9. Temperature contrast diagram of different air-fuel ratio and different heating furnace positions
图 10 不同空燃比下加热炉内残余气体质量分数对比
Figure 10. Comparison of residual gas mass fraction in reheating furnace under different air-fuel ratios
图 11 钛坯在加热炉中不同阶段的温度分布
Figure 11. Temperature distribution of titanium billet at different stages in the heating furnace
图 12 钛坯不同节点温度随时间变化曲线
Figure 12. Temperature curve of titanium billet at different nodes with time
图 13 双炉同时同步加热钛坯的布料方案
Figure 13. Distribution scheme of titanium billet simultaneously heated by double furnace
图 14 双炉加热烧嘴布置及着火方案
Figure 14. Double furnace heating burner layout and burner ignition scheme
图 16 双炉工况下的钛坯加热质量
Figure 16. Heating quality of titanium billet under dual-furnace condition
图 17 双炉工况下出炉温度偏差（实际-目标）统计分布
Figure 17. Statistical distribution of oven temperature deviation under dual-furnace condition (actual-target)
表 1 混合煤气的成分组成
Table 1. Chemical composition of mixed gas
% CO2 CmHn O2 CO H2 9.4 0.8 0.2 17.8 26.1 
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表 2 加热炉不同情况的空燃比
Table 2. Air fuel ratio of reheating furnace under different conditions
不同部位 加热段一
炉顶加热段一
两侧加热段二
炉顶加热段二
两侧均热段
炉顶均热段
两侧方案1（A） 3.50 4.70 3.50 4.70 5.10 2.80 方案2（B） 4.60 5.87 4.67 5.87 7.65 4.20 方案3（C） 8.00 10.0 8.00 9.0 10 6
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表 3 金属钛材热连轧轧制效率及能耗对比
Table 3. Comparison of efficiency and energy consumption in metallic titanium hot continuous rolling
钛带轧制量/t 能耗/（GJ·t−1） 轧制时间/min 小时轧制量/t 加热方式 194.73 20.45 115.52 101.14 双炉 162.14 20.88 89.67 108.49 双炉 161.7 20.53 96.38 100.66 双炉 208.84 20.39 110.37 113.53 双炉 182.93 21.04 108.61 101.06 双炉 161.18 21.70 91.03 106.24 双炉 186.44 19.95 114.96 97.31 双炉 128.93 20.48 80.41 96.20 双炉 129.01 22.41 76.47 101.22 双炉 205.58 20.17 109.79 112.35 双炉 220.59 21.27 127.85 103.52 双炉 167.46 39.21 174.27 57.66 单炉
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