摘要：Determining the venting time of a gas trunk pipeline segment provides an important basis for formulating an emergency plan in the advent of unexpected accidents. As the natural gas venting process corresponds to the transient flow, it is necessary to establish a transient hydraulic-thermal simulation model in order to determine the venting time. In this paper, based on two kinds of venting scenarios in which there is only one venting point in the venting system of a gas trunk pipeline segment-namely, where the venting point is either at one of the two ends or at the junction of two gas trunk pipeline segments-transient hydraulic-thermal simulation models are established. The models consist of gas flow governing equations, the gas state equation, gas physical property equations, initial conditions, and appropriate boundary conditions. The implicit central difference method is used to discretize the gas flow partial differential equations, and the trust-region-dogleg algorithm is used to solve the equations corresponding to each time step, in order to dynamically simulate the whole venting process. The judgment condition for the end of the venting process is that the average pressure of gas trunk pipeline segment is less than 0.11 MPa (actual pressure). Comparing the simulation results of the proposed model with those of the OLGA software and real operational data, we find that the venting time error is less than 10%. On this basis, a venting valve opening control principle is proposed, which prevents the venting noise from exceeded the specified noise value (85 dB) in the venting design of domestic gas pipeline projects. The established calculation model for venting time (dynamic simulation model) for a gas trunk pipeline segment and the proposed opening control principle of venting valve provide reference for the optimal operation of gas pipeline venting systems. (c) 2022 The Authors. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co. Ltd.

关键字：Gas pipeline; Venting time; Transient simulation; Implicit central difference method; Valve Opening Control Method

ISSN号：1672-5107

卷、期、页：卷19期6: 3016-3028

发表日期：2022-12-01

影响因子：4.089900

期刊分区（SCI为中科院分区）：一区

收录情况：SCI（科学引文索引印刷版）,CSCD（中国科技引文期刊）（核心）,SCIE（科学引文索引网络版）

发表期刊名称：PETROLEUM SCIENCE

参与作者：董秦龙,李原欣

通讯作者：金安泰,陈潜,赵思睿

第一作者：左丽丽

论文类型：期刊论文

论文概要：左丽丽,金安泰,陈潜,董秦龙,李原欣,赵思睿，Simulation on venting process and valve opening control method for gas trunk pipelines，PETROLEUM SCIENCE，2022，卷19期6: 3016-3028

论文题目：Simulation on venting process and valve opening control method for gas trunk pipelines