Application of laser induced fluorescence technology in mixing effect analysis of oxidation furnace at titanium dioxide via chloride process
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摘要: 氯化法生产钛白是现今国际上钛白工业的主流生产技术，而氧化反应器的结构设计是氯化法生产钛白的一项关键技术。TiCl4和O2的混合情况对于钛白粉的颗粒粒径及分布、颗粒晶型等产品性能有决定性作用，进而影响到产品的质量。因此，掌握不同工况条件下两种物料气流混合效果，对于氧化反应器的设计以及实际操作参数的优化具有重要意义。然而，现有的研究工作表明，传统的测量技术难以适应复杂流场的高速、非稳定等特性，迫切需要高精度的现代诊断技术。该研究从试验方法上进行了创新，采用无扰动非接触的激光诱导荧光技术(LIF)测量了不同工况下模拟反应器内不同位置处的气体浓度分布，研究了两股气体在不同结构氧化炉及不同物料比下的混合效果及其变化规律，找出了影响混合效果的关键因素。该研究为氧化炉的结构设计和操作工艺条件的控制提供必要的参考，为相关理论模型和数值仿真提供重要的试验参数，对于促进我国钛白生产工艺的发展具有重要的科学意义和实际意义。Abstract: Titanium dioxide (TiO2) through chloride process is the mainstream production technology of titanium dioxide industry in the world nowadays, and the structure design of oxidation reactor is a key technology for the production of titanium dioxide by chlorination. The mixture of TiCl4 and O2 plays a decisive role in the properties of TiO2, such as particle size, distribution and crystal shape, and then affects the quality of the product. Therefore, it is of great significance to monitor the mixing effect of two kinds of material airflow under different working conditions for the design of oxidation reactor and the optimization of practical operation parameters. However, the existing research shows that the traditional measurement technology is difficult to adapt to the characteristics of high speed and instability of complex flow field, so the modern diagnosis technology with high precision is urgently needed. Herein, using the undisturbed non-contact laser induced fluorescence (LIF) the gas concentration distribution in different location of the reactor was measured by simulation under different working condition. The mixing effect and its variation law of the two gases in different oxidation furnace structure and different materials were studied, and the key factors influencing the mixing effect were found out. This study provides necessary reference for the structure design of the oxidation furnace and the control of the operation process conditions, as well as important experimental parameters for the relevant theoretical model and numerical simulation. It shows important scientific and practical significance to promote the development of TiO2 production process in China.
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图 1 激光诱导荧光测量系统示意
Figure 1. Schematic diagram of laser-induced fluorescence (LIF) measurement system
图 3 射流混合中穿透深度(h/R)示意
Figure 3. Schematic diagram of penetration depth (h/R) in jet mixing
图 4 在LIF图像中穿透深度(h/R)确定方法示意
Figure 4. Schematic diagram of the determination method of penetration depth (h/R) in LIF image
图 5 0.0 d处，气体2流量固定、气体1流量增加时的浓度分布
Figure 5. Concentration distribution of gas 2 with fixed flow rate and gas 1 with increased flow rate at 0.0 d
图 6 气流比固定时不同位置处的浓度分布
Figure 6. Concentration distribution at different positions with fixed airflow ratio
图 7 0.0 d处，气流比1.28时不同气流量下的浓度分布
Figure 7. Concentration distribution under different flux at 0.0d with airflow ratio of 1.28
图 8 0.5 d处，不同气流比下混合不均匀度变化情况
Figure 8. Changes of mixing unevenness at 0.5 d under different airflow ratios
图 9 气流比固定时不同位置混合不均匀度变化情况
Figure 9. Variation of mixing unevenness at different positions with fixed airflow ratio
图 10 氧化炉在7种动量比条件下的混合不均匀度(E)值变化情况
Figure 10. Variation of mixing unevenness (E) values in the oxidation furnace under 7 momentum ratios
表 1 气体流量控制条件
Table 1. Gas flow control conditions
气流
工况气体1流量/
(m3·h−1）气体2流量/
(m3·h−1）气流比
（气体2/气体1）1 266 380 1.43 2 298 380 1.28 3 330 380 1.15 4 365 380 1.04 5 280 400 1.43 6 312 400 1.28 7 380 400 1.05 
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