含硫天然气集输管道硫沉积预测技术研究

发布时间：2019-05-23 09:41

【摘要】：本文根据硫在酸性气体中的溶解度随温度压力而变化的规律,建立了精准的硫沉积预测模型,对集输管道中硫单质的沉积位置与沉积量进行了计算,并确定了管道经济清管周期,为集输管线硫沉积的防治奠定了基础。本文主要完成了以下工作:(1)通过对含硫酸性气体的物理性质的研究,对其物性参数计算方法的优选,得出结论:最适合含硫天然气偏差系数的计算方法是DPR(W-A校正)方法。Dempsey法结合Stanging校正是计算含硫气体粘度时的首要方法。计算含硫天然气的物性参数的主要影响因素有H_2S、温度、压力。其中H2S的含量对偏差系数和粘度的影响较大,在低压的情况下气体粘度是随着H_2S含量的增大而减小的,在高压情况下气体粘度是随着H_2S含量的增大而增大的。(2)根据能量守恒定律以及动量原理推导建立了输气管道压力温度分布模型,经过计算结果与实际的结果相比较,本文建立的计算模型可以较好的预测管道内温度压力的分布状况,误差较小。(3)通过比较实验法、经验公式法、计算法这三种方法对于预测硫在酸性气体中的溶解度模型的优劣性,分析得出了计算法是最适合用来预测硫的溶解度模型。通过当硫组分达到热力学平衡时固相和气相的逸度相等这一结论推导出了固体硫在酸性气体中溶解度的表达式。(4)根据工程气固两相流动相关理论基础和固体颗粒的受力分析,得到了硫沉积的动力学模型,由此计算出了硫沉积的临界速度,如果气流速度大于临界速度,则析出的硫不会在管线中沉积下来,如果气流速度小于临界速度,析出的硫会在管线中沉积下来。(5)总结了影响清管周期的因素,即最小允许输送效率、最大允许积液量、和最大允许压降,并对此作了详细说明。对于清管流程的判定、清管周期的确定则依据石油天然气行业的有关标准规范的规定,从输气效率方面进行了确定,最后计算了有硫沉积量影响下的经济清管周期。
[Abstract]:according to the law of the change of the solubility of the sulfur in the acid gas with the temperature pressure, a precise sulfur deposition prediction model is established, the deposition position and the deposition amount of the sulfur simple substance in the gathering and transportation pipeline are calculated, and the pipeline economic pigging period is determined, And lays a foundation for preventing and treating the sulfur deposition of the gathering and transportation pipeline. The following work is mainly done in this paper: (1) By studying the physical property of the sulfuric acid-containing gas, it is concluded that the method for calculating the deviation coefficient of the sulfur-containing gas is the DPR (W-A correction) method. The Dempsey method combined with the Stanging correction is the primary method for calculating the viscosity of a sulfur-containing gas. The main influencing factors of the physical parameters of sulfur-containing natural gas are H _ 2S, temperature and pressure. In which the content of h2s is greatly influenced by the deviation coefficient and the viscosity, and the gas viscosity is reduced with the increase of the content of the h _ 2S under the condition of low pressure, and the gas viscosity is increased with the increase of the content of the H _ 2S under the high pressure condition. (2) According to the energy conservation law and the momentum principle, the pressure temperature distribution model of the gas pipeline is established, and the calculated results are compared with the actual results. The calculation model established in this paper can predict the distribution of the temperature pressure in the pipeline well, and the error is small. (3) The solubility model of the sulfur in the acid gas is predicted by comparing the experimental method, the empirical formula method and the calculation method. The results show that the calculation method is the most suitable for predicting the solubility of the sulfur. The expression of the solubility of the solid sulfur in the acid gas is derived by the conclusion that the solid phase and the gas phase are equal when the sulfur component reaches the thermodynamic equilibrium. (4) according to the theoretical basis of the gas-solid two-phase flow of the engineering and the stress analysis of the solid particles, the kinetic model of the sulfur deposition is obtained, the critical speed of the sulfur deposition is calculated, and if the gas flow speed is higher than the critical speed, the precipitated sulfur is not deposited in the pipeline, If the velocity of the gas flow is less than the critical speed, the precipitated sulfur is deposited in the line. (5) The factors that affect the pigging cycle are summarized, that is, the minimum allowable delivery efficiency, the maximum allowable effusion, and the maximum allowable pressure drop. For the determination of the pigging process, the determination of the pigging period is determined from the gas transmission efficiency according to the relevant standard specifications of the petroleum and natural gas industry, and the economic pigging period under the influence of the sulfur deposition amount is finally calculated.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE866

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