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真空形成与维持是保证真空管道交通正常运行的重要工作,此工作可通过真空泵排气、车辆运行排气或活塞排气等方式予以实现。在粗真空形成阶段,即从常压1.01325×10~5到1.01325×10~4Pa,需要排出90%气体,适合采用建设在管道沿线的真空泵排气方式,同时,活塞式排气方式亦可考虑。在1.01325×10~4Pa以后,即管道内真空度高于1/10大气压时,管道内残留的气体量小于常压时气体量的10%,气压较低,用真空泵排气时效率低,能耗大,而用车辆运行排气方式时,相对效率较高,所需高压储气瓶数量不多,排气总成本较小,因此适合采用车辆运行排气方式。补抽气属于后期阶段排气过程,宜优先采用车辆运行排气方式。
Vacuum formation and maintenance is to ensure the normal operation of the vacuum pipe traffic an important task, this work can be achieved by vacuum pump exhaust, vehicle exhaust or piston exhaust and so on. In the stage of rough vacuum formation, ie, from atmospheric pressure of 1.01325 × 10-5 to 1.01325 × 10-4Pa, 90% of the gas needs to be discharged, so it is suitable to adopt the vacuum pump exhaust method built along the pipeline, and the piston exhaust method is also considered . After 1.01325 × 10 ~ 4Pa, that is, when the degree of vacuum in the pipeline is higher than 1/10 atm, the amount of gas remaining in the pipeline is less than 10% of the amount of gas at atmospheric pressure, the pressure is low, and the efficiency is low when the vacuum pump is used for exhausting Consume large, and the vehicle exhaust mode, the relative efficiency is high, the required number of high pressure gas cylinders is not small, the total cost of exhaust is small, so suitable for the use of vehicle exhaust mode. Supplement gas exhaust belongs to the exhaust phase of the later stages, should be given priority to use the vehicle exhaust mode.