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涩宁兰输气管道沿线经过我国西北高原寒冷地区,因输送气质含水量较大、管道投运过程干燥不彻底,导致管道中存留液态水,在高压、低温条件下极易发生水合物冻堵。针对2010年冬季涩宁兰输气管道兰州末站发生的水合物堵塞事故,对管道中天然气气质的水露点和运行参数进行分析。将天然气的水露点值换算成含水量值,并将分析得到的含水量值和工艺运行参数范围与水合物生成条件参数进行对比,根据对比结果控制管道的运行参数,以防止水合物的生成。介绍了通过添加抑制剂防止水合物生成的方法及其添加量的计算方法。涩宁兰输气管道水合物事故分析与预防技术实践表明:与添加抑制剂方法相比,采用检测气质参数和监测管道工艺运行参数防止输气管道系统中生成水合物的方法,更能满足生产要求,且经济性与安全性更高。
Astringent Ninglan gas pipeline along the northwestern plateau in China through cold areas, due to delivery temperament water content is large, the pipeline is not completely dry during the commissioning process, resulting in the pipeline liquid water, high pressure, low temperature conditions prone to freeze hydrate blocking . In view of the hydrate blockage accident occurred in the winter of 2010 in Seibu-Ning-Lan gas transmission pipeline, the water dew point and operating parameters of natural gas in the pipeline were analyzed. The water dew point value of natural gas is converted into the water content value. The analyzed water content value and the process operation parameter range are compared with the hydrate generation condition parameters, and the operation parameters of the pipeline are controlled according to the comparison result to prevent the hydrate generation. A method of preventing hydrate formation by adding an inhibitor and a method of calculating the amount of addition thereof are described. Sene Ninglan Gas Pipeline Hydrate Accident Analysis and Prevention Technology Practice shows that: Compared with the method of adding inhibitors, the use of detection of gas quality parameters and monitoring of pipeline operating parameters to prevent gas pipeline hydrate production methods to better meet the production Requirements, and more economical and safer.