磨料射流在输油气管道切割中的应用

Application of abrasive jet for pipe cutting of oil and gas pipelines

通过室内实验对磨料射流切割改造输油气管道的可行性进行研究,得到泵压、喷嘴直径、磨料浓度、喷嘴横移速度、喷射角度等工作参数对磨料射流切割深度的影响规律:磨料射流切割深度与泵压成正比,与喷嘴的移动速度成反比,喷嘴直径、磨料分数以及喷射角度均存在最优值。利用遗传算法确定并优化磨料射流切割模型中的未知参数,得出切割深度计算模型,利用该模型预测磨料射流切割深度,最大误差为16%,最小误差为1.5%,符合工程要求。

Feasibility study on oil and gas pipelines by abrasive jet cutting is conducted through laboratory experiments, to obtain the law for impacts of operating parameters such as pump pressure, nozzle diameter, abrasive concentration, nozzle traverse speed and injection angle on abrasive water jet cutting depth, that is, the abrasive jet cutting depth is proportional to the pump pressure and inversely proportional to the nozzle movement speed and the nozzle diameter, abrasive fraction and injection angle all have optimal values. Genetic algorithms are used to determine and optimize undetermined parameters in the abrasive jet cutting model so as to obtain the cutting depth calculation mode. This model can be used to predict the abrasive jet cutting depth with the maximum error of 16% and minimum error of 1.5%, which complies with engineering requirements. （1 Table, 8 Figures, 6 References）