输气管道气电混合动力漏磁检测器研制与应用

Development and application of pneumatic-electric hybrid magnetic flux leakage detector for gas transmission pipelines

【目的】针对传统空压机动力源漏磁检测器在新建及低流量、零输量等长输天然气管道中难以适用的问题,研制一种气电混合动力漏磁检测器,并对其技术优势进行分析与验证。【方法】根据检测器在气体管道中行进的普遍原理,基于传统空压机动力源漏磁检测器实施管道内检测时的运行状态分析,提出气电混合动力内检测器在管道中行进的动力学模型,在漏磁检测器中额外增加电机主动驱动功能,使检测器在鼓风机和自有动力下行进,若遇阻力突变区,电机介入工作,规避了检测器卡堵憋压、发生气爆而高速行进等问题,同时保证其在管道中的通行性。【结果】气电混合动力漏磁检测器在中俄东线天然气管道工程大庆—哈尔滨(大哈)支线实施投产前内检测,在全长52 km的管道中共检测出各类特征6930处,并对其中1处金属损失进行开挖验证,缺陷里程、类型、地面定位信息、长度、宽度、深度、时钟位置等各项检测数据均符合相关标准要求。【结论】气电混合动力漏磁检测器采用鼓风机和自有动力作为行进动力具有明显优势,在实际工程应用中表现出较好的安全性、动力性及数据稳定性:低压低流鼓风机避免了空压机产生高压气体带来的安全隐患;速度可控使检测器可以匀速前进,保障了采集数据质量和检测精度;气动和电动双重动力作用下,检测器更快速通过穿跨越、弯头等较易卡堵位置,降低了检测器卡堵风险;若能在降低制造成本及系统复杂性、提高电池电量续航能力等方面有所改进,则其应用前景更加广阔。(图6,表2,参21)

[Objective]This paper focuses on developing a pneumatic-electric hybrid magnetic flux leakage(MFL)detector,examining and verifying its technical advantages to overcome challenges in using traditional air compressor-driven MFL detectors in both newly constructed long-distance natural gas pipelines and established pipelines with low flow rates or no transmission.[Methods]After analyzing the operational states of traditional air compressor-driven MFL detectors during inner pipeline detection,a dynamic model was constructed to simulate the motion of a pneumatic-electric hybrid inner detector within a pipeline,adhering to fundamental principles of detector mobility in gas pipelines.The MFL detector was enhanced with an active motor drive function to operate using both the blower and motor drive mechanisms.The motor was activated upon encountering abrupt changes in resistance,effectively addressing challenges such as detector blockages,pressure buildup,and acceleration caused by gas explosions,while ensuring smooth detector passage through the pipeline.[Results]The pneumatic-electric hybrid MFL detector developed in this study was used for the pre-commissioning inner detection of the Daqing-Harbin branch line of the China-Russia East-route Natural Gas Pipeline.It successfully detected various features at 6,930 positions along the 52 km pipeline.The subsequent excavation was performed at a position where metal loss was reported,confirming that all detection data,including defect location in mileage,type,ground positioning,length,width,depth,and clockwise direction,aligned with the excavation results.[Conclusion]The pneumatic-electric hybrid MFL detector has obvious advantages by using blower and its own power as the driving force,making it effective in practical engineering applications concerning safety,power performance,and data reliability.By integrating a low-pressure and low-flow blower,it effectively eliminates potential safety hazards commonly associated with high-pressure gas,prevalent in air compressor operations.The controllable speed feature ensures uniform detector movement,thereby improving data quality and detection accuracy.With the combined pneumatic and electric power,the detector navigates potential jamming points like crossings/spannings and bends swiftly,reducing the risk of blockages.This innovative detector shows promising application prospects,necessitating improvements in cost-effectiveness,system simplicity,and battery life.(6 Figures,2 Tables,21 References)