原子能科学技术2026，Vol.60Issue(z1)：29-39,11.DOI:10.7538/yzk.2026.youxian.0175
地浸采铀长距离管道输运气液两相流稳定性分析与气堵风险诊断
Stability Analysis of Gas-liquid Two-phase Flow and Gas Blockage Risk Diagnosis in Long-distance Pipeline Transportation for In-situ Leaching Uranium Mining
摘要
Abstract
In the CO2+O2 in-situ leaching(ISL)uranium mining process,the long-distance pipeline transportation of gas-liquid two-phase mixtures from the surface to the injection wellhead frequently suffers from gas-phase retention and gas blockage,which severely compromises oxygen delivery efficiency and operational safety.Such mixtures are typically generated by surface dissolved oxygen devices,among which the 16-6 jet-type unit is the most widely adopted in uranium mining operations across China.To systematically investigate the stability characteristics of gas-liquid two-phase flow from such devices during long-distance pipeline transportation and to develop quantitative diagnostic criteria for gas blockage risk assessment,a field experimental system was established at a uranium mine in Inner Mongolia,China,enabling in-situ measurements under actual pressurized operating conditions.High-frequency pressure fluctuation signals and high-speed camera images were simultaneously acquired at two observation stations separated by 300 m,namely,immediately downstream of the dissolved oxygen device and at the injection wellhead,respectively.The pressure signals were analyzed using a multi-scale approach integrating fast Fourier transform(FFT),continuous wavelet transform(CWT),and discrete wavelet transform(DWT),while high-speed imaging provided direct visualization of bubble dynamics and flow pattern evolution.The results reveal that the outlet of the 16-6 jet-type dissolved oxygen device exhibits a highly turbulent flow field characterized by dense bubble swarms with irregular shapes and vigorous motion.The bubble size distribution is notably broad,with a considerable proportion of large bubbles,indicating intense bubble breakage and coalescence driven by strong shear forces.Moreover,the power spectral density exhibits a dominant peak in the intermediate-frequency range,and the high-frequency turbulent kinetic energy accounts for a substantial share of the total energy,which serves as the dynamic source for effective oxygen dissolution but also introduces significant flow uncertainty.In contrast,after 300 m of pipeline transportation,the flow characteristics undergo substantial evolution:the high-frequency energy attenuates dramatically,and the energy distribution shifts predominantly toward the low-frequency region,indicating that the flow regime transitions from turbulence-shear dominated to pipeline-transport dominated.Concurrently,the pressure fluctuation standard deviation decreases markedly,and the autocorrelation half-life extends considerably,suggesting improved flow regularity.Nevertheless,the elevated low-frequency oscillations and the persistent moderate-frequency energy indicate that secondary bubble coalescence remains a potential risk at the wellhead under elevated downhole pressure conditions.On the basis of these findings,two quantitative diagnostic indicators for gas blockage risk were established:the high-frequency energy ratio(HFE),which reflects bubble coalescence activity,and the autocorrelation coefficient(AC),which characterizes flow regularity.Accordingly,HFE values above a specified threshold coupled with low AC values correspond to high-risk conditions typical of the dissolved oxygen device outlet,whereas low HFE combined with high AC indicates stable flow at the wellhead.Consequently,a practical early-warning strategy integrating real-time pressure monitoring,threshold-based risk assessment,and proactive operational adjustments is proposed to prevent gas blockage incidents.This research provides a theoretical foundation and technical support for intelligent monitoring and safe operation of gas injection systems in ISL uranium mining.关键词
地浸采铀/压力信号/注气调控Key words
in-situ leaching uranium mining/pressure signal/gas injection regulation分类
能源科技引用本文复制引用
曹鸣谦,王亚安,原渊,程威,杜志明,翁海成,胥国龙,陈乡,李召坤..地浸采铀长距离管道输运气液两相流稳定性分析与气堵风险诊断[J].原子能科学技术,2026,60(z1):29-39,11.基金项目
中核集团"青年英才"项目 （）
国防科工局核技术研发科研项目(HJSYF2025(06)) （HJSYF2025(06）
