珠三角天然气长输管道是为了缓解珠江三角洲地区天然气供应紧张局面、配合 LNG 接收站天然气外输而规划建设的一条长距离输气管道。管道计划分两期建设，其中一期 工程管道总长 334.37km，设计输气能力为 43.32×10 8 Nm 3 /a，二期管道总长为 131.78km， 设计输气能力为 105.63×10 8 Nm 3 /a，沿途分干线、支干线和支线。 报告在对珠三角天然气长输管道建设的必要性论证的基础上，提出了南线和北线两 个路由，对沿线地质情况、地形地貌和人文社会情况进行对比分析，最终选择南线方案 为珠三角天然气长输管道的最佳线路方案；针对干线不同段落输量不同的特点，采用变 管径设计，通过对 27 套管径组合方案的工艺计算和费用现值计算，依据费用现值最小 原则，确定了干线的最优管径组合方案，从满足压降要求同时尽量减少投资的角度出发， 确定了支干线和支线的最优管径，确定了输气站的个数和站址，并对各个输气站进行了 工艺流程设计；通过设备选型计算和强度计算，确定了各个输气站的主要输气设备和管 道管材的规格；通过对设计方案进行投资估算、经济指标计算、盈亏平衡分析和敏感性 分析，对珠三角天然气长输管道的可行性进行了研究，研究结果表明：该项目所得税后 财务内部收益率为 11.60%，所得税前财务内部收益率为 12.48%，财务内部收益率均大 于设定的基准收益率 10%，说明该项目盈利能力满足最低要求，项目在经济上是可行的， 但项目的抗风险能力不强。 关键词：输气管线；工艺计算；方案优选；经济评价；可行性研究ii Feasibility study of long distance natural gas pipeline project in Pearl River Delta Luo Ziyuan(Petroleum and Natural Gas Engineering) Directed by Professor An Jiarong Abstract The long distance natural gas pipeline in the Pearl River Delta is planned to ease the tight supply situation of Pearl River Delta area, assisted with the natural gas transmission of LNG Terminal. It is planned to be constructed in two phases, including pipeline length 334.37km of phase 1 with the designed gas transmission capacityof 43.32×10 8 Nm 3 /a, pipeline length 131.78 km of phase 2 with the designed gas capacity of 105.63×10 8 Nm 3 /a. The whole pipeline includes trunkline, branch trunklines and branch lines. According to the topography along the hydrogeological conditions and cultural situation, This paper is developed a plan of southern and northern pipeline route based on the necessity argument of the Pearl River Delta Natural Gas Pipeline construction. With the help of comparative analysis. The Southern line was choosed as the best route plan of Pearl River Delta long distance gas pipeline. Variable pipe diameters were used according to different transmission volume for different pipeline. By calculating the process and present value of the cost of 27 sets of pipe with different diameters, based on the present value of costs minimum principles, the optimal pipe diameters combination were determined. For meeting the requirements of pressure drop and minimizing investment, The optimal diameter of branch tunklines and branch lines, numbers of gas stations and location, also the process flow design were made for each gas station. Through the calculation of equipments selection and intensity, main gas equipments of stations and pipe specifications of pipeline were selected. Through investment assessment, economic indicators calculation, break-even analysis and sensitivity analysis for design plan, the feasibility of long distance gas pipeline in the Pearl River Delta was studied. The results showed that: the project after-tax internal rate of return 11.60%, pre-tax financial internal rate of return of 12.48%, financial internal rate of return is 10% greater than setted benchmark rate of return. It indicates that the profitability of the project meets the minimum requirements, the project is feasible in economic, but the anti-risk ability of the project is not strong. Keywords：Gas transmission pipeline; Process calculation; Case optimization; Economic evaluation; Feasibility studyiii 目 录 第一章 绪论...................................................................................................................................................1 1.1 课题的研究背景及意义................................................................................................................. 1 1.2 管道工程概况................................................................................................................................. 2 1.3 输气量分配..................................................................................................................................... 3 1.3.1 天然气输送量..................................................................................................................... 3 1.3.2 用户量分配......................................................................................................................... 3 1.4 本文的主要工作............................................................................................................................. 4 第二章 管道工程线路方案优选...................................................................................................................6 2.1 沿线自然概况................................................................................................................................. 6 2.2 线路设计概况................................................................................................................................. 9 2.3 线路选择的方法........................................................................................................................... 10 2.4 管道工程线路方案优化研究....................................................................................................... 11 第三章 管道工程输气工艺可行性研究.....................................................................................................22 3.1 管道工程基础资料....................................................................................................................... 22 3.1.1 管线输气量及设计压力................................................................................................... 22 3.1.2 天然气气体组份及主要物性........................................................................................... 22 3.1.3 主要设计参数................................................................................................................... 22 3.2 水力分析及管线系统优化........................................................................................................... 23 3.2.1 天然气的热物性计算....................................................................................................... 23 3.2.2 水力分析的基本方程........................................................................................................ 24 3.2.3 水力分析和管线系统优化原则....................................................................................... 25 3.3 水力计算和调峰分析................................................................................................................... 26 3.3.1 管道系统调峰方案........................................................................................................... 26 3.3.2 方案比选........................................................................................................................... 28 3.4 工艺方案优化............................................................................................................................... 28 3.4.1 干线管径优选................................................................................................................... 29 3.4.2 管道支干线、支线管径选择........................................................................................... 30 3.4.3 压缩机的选取................................................................................................................... 31 3.5 工艺方案的可行性研究................................................................................................................ 31 3.5.1 管线系统的可行性分析................................................................................................... 31 3.5.2 接收站输入首站的天然气小时流量比例大于设计值时的校核分析 .....................