Experimental study on visualization of refined oil migration in soil

doi:10.11949/0438-1157.20221667

Abstract

Abstract:

In order to reduce the impact of refined oil pipeline accidents and better understand the flow of refined oil in the soil, an indoor visualization experiment device is built. Based on digital image processing technology, the saturation of diesel oil that is difficult to measure in real time and the HSI color mode that is easy to obtain are established. The functional relationship between each component is verified by sampling experiments. The results show that H (hue) and S (saturation) can be used as indicators to determine whether oil is contained in porous media. The oil saturation can be characterized with an accuracy of up to 3.12% by S in the low saturation region. The oil saturation can be characterized within ±2% by I (intensity) in the high saturation region. A dynamic, real-time, non-invasive laboratory technique of visualizing the migration of refined oil within the soil is established, which can support the evolution of the leakage process. The research results make up for the technical deficiency in China regarding the visualization of oil leakage dispersion in soil. This is of great significance to effectively control the environmental pollution caused by refined oil and reduce the hazards caused by oil leakage.

Key words: refined oil leakage, porous media, diffusion, saturation, visualization, image analysis, pollution

摘要：

为了减少成品油管道事故影响，更好地掌握成品油在土壤中的流散规律，搭建了室内可视化实验装置，基于数字图像处理技术，建立了难以实时测量的柴油饱和度与方便获取的HSI颜色模式各分量之间的函数关系，并通过采样实验进行了验证。结果表明，H(色度)和S(饱和度)可以作为判断多孔介质内是否含油的指标；通过S在低饱和区对油饱和度表征精度可达3.12%；通过I(亮度)在高饱和区对油饱和度表征精度在±2%以内。建立的动态、实时、非侵入式的土壤内部成品油运移的可视化手段，可为泄漏过程演化提供支持。研究成果弥补了国内油品在土壤中泄漏扩散可视化方面的技术不足，对于有效控制成品油引起的环境污染问题、减少油品泄漏带来的危害具有重要意义。

关键词: 成品油泄漏, 多孔介质, 扩散, 饱和度, 可视化, 图像分析, 污染

CLC Number:

TE 88

Xiangning HU, Yuanbo YIN, Chen YUAN, Yun SHI, Cuiwei LIU, Qihui HU, Wen YANG, Yuxing LI. Experimental study on visualization of refined oil migration in soil[J]. CIESC Journal, 2023, 74(4): 1827-1835.

胡香凝, 尹渊博, 袁辰, 是赟, 刘翠伟, 胡其会, 杨文, 李玉星. 成品油在土壤中运移可视化的实验研究[J]. 化工学报, 2023, 74(4): 1827-1835.

Figures/Tables 12

Fig.1 Diesel viscosity with different volume fractions of dye

Fig.2 Schematic diagram of measuring device

Fig.3 Schematic diagram of the overall experimental device

Fig.4 Schematic diagram of sampling sites

Fig.5 Schematic diagram of the filter

Fig.6 Flow chart of picture batch processing

Fig.7 Images of sample box with different saturations

Fig.8 H, S, I component images of experimental group and control group when So=0.1, 0.7

Fig.9 Calibration curve of So-H, So-S, So-I

Fig.10 Images of dyed diesel diffusing in porous media

Fig.11 Variation of H, S, and I relative values with pixel coordinates

Table 1 Measured and calculated saturation of sampling points

编号	S_o	S_o，_H	S_o，_S	S_o，_I	δ_H /%	δ_S /%	δ_I /%
1	0.9712	0.3290	0.7456	0.9762	197.39	31.22	0.23
2	0.9874	0.3278	0.7560	0.9957	201.22	30.61	-0.83
3	0.7721	0.5857	0.7515	0.7876	31.83	2.74	-1.97
4	0.3011	—	0.2920	—	—	3.12	—
5	0	—	0.0047	—	—	—	—

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