天然气长输管线投产关键指标参数规律研究

Research on the Key Index Parameters of Natural Gas Long Distance Pipeline Production

摘要: 随着全球气候变暖的影响，天然气作为清洁能源得到大力推广，继而推动着越来越多的天然气长输管线建成并投入运行。天然气的易燃易爆性，使得很有必要对天然气长输管线投产进行研究，以得出投产中的规律并以此制定相关的措施和注意事项，继而确保天然气长输管线投产的安全性和平稳性。在天然气长输管线投产中，一般采用氮气隔离天然气和空气的方式进行投产，这就使得投产中会产生两个混气段，而气头推进速度和氮气段长度是天然气长输管线投产中最重要的两个指标参数。本文对某长输管线投产中相邻阀室间气头推进速度与气头到某阀室瞬时氮气段长度进行数据分析，后选择数学模型进行整合。研究表明：相邻阀室间气头推进速度与气头到某阀室瞬时氮气段长度均满足正态分布模型。将该数学模型对某天然气长输管线投产上进行验证，结果显示符合该模型的指标参数可保证天然气长输管线投产的安全性和平稳性。综合上述可以得出建议：为确保天然气长输管线安全性与稳定性，建议在天然气长输管线投产中相邻阀室间气头推进速度与气头到某阀室瞬时氮气段长度可预先利用正态分布模型确定均值，并在实际投产中控制指标参数其在均值波动范围内即可。

Abstract: With the impact of global climate change, natural gas has been vigorously promoted as a clean en-ergy source, which has driven the construction and operation of more and more long-distance nat-ural gas pipelines. The flammability and explosiveness of natural gas make it necessary to conduct research on the production of long-distance natural gas pipelines, in order to determine the rules during production and formulate relevant measures and precautions, in order to ensure the safety and stability of long-distance natural gas pipeline production. In the production of natural gas long-distance pipelines, nitrogen is generally used to isolate natural gas and air, which results in two mixed gas sections. The gas head propulsion speed and nitrogen section length are the two most important indicator parameters in the production of natural gas long-distance pipelines. This article analyzes the data of the gas head propulsion speed between adjacent valve chambers and the instantaneous nitrogen section length from the gas head to a certain valve chamber during the production of a long-distance pipeline, and then selects a mathematical model for integration. Re-search has shown that the pushing speed of the gas head between adjacent valve chambers and the instantaneous nitrogen section length from the gas head to a certain valve chamber both satisfy a normal distribution model. The mathematical model was validated on the production of a certain natural gas long-distance pipeline, and the results showed that the index parameters that meet the model can ensure the safety and stability of the natural gas long-distance pipeline production. Based on the above, it can be concluded that in order to ensure the safety and stability of natural gas long-distance pipelines, it is recommended to use a normal distribution model to determine the mean value of the gas head propulsion speed between adjacent valve chambers and the instanta-neous nitrogen section length from the gas head to a certain valve chamber during the production of natural gas long-distance pipelines, and to control the indicator parameters within the fluctua-tion range of the mean value in actual production.