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由于天然气输气管线埋在地下，在通球清管过程中，球的运行情况不能直接观察，管线入口和出口压力在球运行过程中的变化也不能提前预测，也难准确控制进气量，使球能以１ｍ／ｓ的速度到达出口，为此进行了天然气输气管线清管通球计算机仿真系统的设计与实现的研制。该仿真系统是在深入分析和研究天然气输气管线清管通球运行规律的影响因素的基础上，以数据库管理、计算机仿真技术和人工智能等新技术为主要工具来开发的。着重介绍了该仿真系统的总体结构与功能设计，软件编程与调试。该仿真系统能真实仿真清管球在管线内运行，通过对靖边—榆林输气管线多次清管通球的运行过程实际模拟，其符合率在９３％以上。

DESIGN AND REALIZATION OF THE COMPUTER SIMULATION SYSTEM FOR THE SPHERICAL PIGGING IN GAS PIPELINE

??Owing to the fact that the gas pipeline is shallowly buried underground,the operation of the spherical pig can??t be directly observed in the process of spherical pigging,the change of the pressures at the entrance and exit of pipeline can??t be also forecasted in the movement of the spherical pig and it is difficult to accurately control the inlet gas flow to make the spherical pig reaching the exit at a velocity of 1 m/s,for which the design and realization of the computer simulation system for the spherical pigging in gas pipeline are carried out.On the basis of analyzing and studying the factors affecting the operation rule of the spherical pigging in gas pipeline,the simulation system was developed by taking the advanced techniques,such as the data base administration,computer simulation and artificial intelligence,etc.,as the major means.The overall structure,function design,program composition and debugging of the simulation system are emphatically introduced in the paper.The movement of the spherical pig in pipeline can be simulated by the simulation system.Through multiple simulation for the operation of the spherical pigging in the gas pipeline from Jingbian to Yushu,its coincidence rate is more than 93%.