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天然气长输管道并行跨接方案比选
Comparison of the crossover schemes for the parallel long-distance natural gas pipeline
natural gas pipeline
; crossover between compressor stations; crossover between valve chambers; scheme research针对我国天然气长距离管道日益增多, 独立管道出现事故频繁、 管道停输等问题,调研了国内外天然气长输管道并行跨接规范及管道跨接方案设置技术, 在西气东输五线与六线并行管道进行了 4 种跨接方案应用, 并进行了管道受损等效对比研究。结果表明:跨接阀数量与年系统降量呈反比, 随着跨接阀数量的增加, 系统年失效频率增加, 年挽回的损失气量相应降低, 导致挽回的损失气量与增加投资的比值变小。两座站间设置1 座跨接阀室的跨接方案性价比最高, 这说明在设置跨接方案时, 存在一个最优的跨接阀数量。建议在西气东输五线与六线站间设置1 座跨接阀室, 采用阀前、 阀后均设跨接管的设计方案, 该方案能提高管道事故应急调配能力, 并能保障整个管道系统的供气可靠性, 设计方案较为经济合理。
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