酸性天然气硫沉积机理研究

项目名称： 酸性天然气硫沉积机理研究

项目编号： No.51276199

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 能源与动力工程

项目作者： 徐明海

作者单位： 中国石油大学（华东）

项目金额： 70万元

中文摘要： 高含硫化氢酸性天然气在我国有较大的储量，已有多个气田在运行，产能达一百多亿方。酸性天然气集输过程中出现硫沉积为国内外普遍的现象，沉积的硫加速了管材腐蚀和堵塞仪表引线导致仪表失灵，造成集输系统安全隐患，而硫化氢为极高致死性有毒气体，集输系统安全运行极为重要。硫沉积首先是硫过饱和成核析出、硫核生长，尔后硫核碰撞黏附和颗粒随气流运动与管壁碰撞和沉积，涉及到流动、散热和气固两相流动迁移科学和过饱和与成核等非平衡态热力学知识。本研究根据经典的成核理论，建立实际工况条件下的硫成核析出与颗粒形成模型、采用RNG模型模拟主流区湍流运动、层流模型模拟壁面附近粗糙度影响的层流底层流场，结合涡寿命和颗粒运动模拟硫颗运动轨迹，考虑壁面粗糙情况，修改完善硫黄颗粒与壁面作用模型参数，研究流沉积的机理、获得气流速度、颗粒尺度与硫沉积规律之间制约关系的模拟，实现硫沉积的预测。

中文关键词： 酸性天然气；核化；数值解法；集输系统；硫沉积

英文摘要： There are large number of reserves of acid natural gas with high concentrations of hydrogen sulfide in our country. Many gas fields have been in production, the full capacity can exceed ten billion cubic meters. Deposition of elemental sulphur in acid natural gas transportation systems has been reported on as the universal phenomenon. And the sulfur deposition can accelerate tubing corrosion and block the instrument lead and result in instrument malfunction, which can cause potential risk for gathering and transportation system. Furthermore, the hydrogen sulfide is high fatal poisonous gas which is hazard to human lives of workers. The mechanism of sulfur deposition is the sulfur nucleation and precipitation resulting of supersaturation of sulphur concentration, the growth of nucleation of sulfur, and movement of the nucleation along with the airflow and striking and attaching to the wall. The whole process of sulphur deposition involves the knowledge of flow and heat transfer, solid-gas two phase flows, and the non-equilibrium state thermodynamics knowledge of supersaturation and nucleation. This research establishes a model of nucleation, precipitation, particles formation and deposition of element sulfur under operation conditions according to the classic nucleation theory. The turbulent movement in mainstrea

英文关键词： sour natural gas；nucleation；numerical method；natural gas gathering sysytem；depostion of sulphur