高含硫原油储运过程中硫化氢挥发数值模拟

Numerical simulation of hydrogen sulfide volatilization from high sulfur crude oil during storage and transportation process

分析高含硫原油储运过程中硫化氢挥发的主要影响因素,根据分子扩散原理、Fick第二扩散定律及相关热力学知识,建立了高含硫原油储运过程中的硫化氢挥发模型。以某油田高含硫原油储运过程为例,分析硫化氢挥发浓度与温度、挥发时间的关系曲线。结果表明,该模型可用来反映高含硫原油储运过程中的硫化氢挥发规律,预测硫化氢挥发浓度与挥发时间和温度的关系,也可为高含硫原油储运过程中的安全标准及安全措施的制定提供技术依据。

Due to the high viscosity and complex operation of storage and transportation, on-time monitoring of the volatilization of hydrogen sulfide from high sulfur crude oil tends to be difficult. In order to overcome this issue, a mathematic model is established to calculate and predict the volatilization of hydrogen sulfide. Through analyzing the hazards and major affecting factors for hydrogen sulfide volatilization from the high sulfur crude oil during storage and transport process, the model is built according to the molecule diffusion principle by utilizing Fick＇ s second scattering law and related knowledge of thermodynamics. By taking some oil fields＇ storage and transport process as the example, corresponding mathematic model have been developed to calculate the relation among hydrogen sulfide volatilization concentration, temperature and time. The study indicates that hydrogen sulfide volatilization concentration increased with the rise of temperature. The result has also pointed out that hydrogen sulfide volatilization concentration increased quickly with time in the earlier stage and dropped after a steady stage. This mathematic model is able to describe the volatilization rule of hydrogen sulfide from high sulfur crude oil during the storage and transport process. It is also able to predict the relation between volatilization concentration, time and temperature. In addition, the model can provide a technical basis for the establishment of the security standard and measures for the storage and transport process of high sulfur crude oil.