Abstract:

Under high inlet gas volume fraction, the pressurization of the multiphase pump deteriorates sharply, which poses a threat to the safe and stable operation of the chemical production process. This study uses two test methods, surging test and mapping test, to comprehensively explore the impact of multiple operating parameters on the overall and inter-stage gas-liquid two-phase pressurization characteristics of a three-stage mixed-flow multiphase pump. The results show that with the increase of liquid flow rate, the downward trend of the pressurization curve caused by the deterioration of the performance of the three booster stages gradually disappears. The significant deterioration of the pressurization performance of the multistage multiphase pump is mainly attributed to the sharp decline in the performance of the first booster stage. Increasing liquid flow rate can effectively reduce gas accumulation, and its positive promoting effect on pressurization performance significantly exceeds the negative effect caused by flow separation, so pressurization presents a sudden upward trend with the liquid flow curve. Increasing the inlet pressure helps to alleviate the negative impact of air mass accumulation on pressurization performance.

Key words: pump, mixed-flow multiphase pump, gas-liquid flow, gas holdup, severe pressurization deterioration

摘要：

在高入口含气率下，混输泵的增压性能剧烈恶化，对化工生产过程的安全稳定运行构成威胁。采用surging test和mapping test两种测试方法，全方位探讨了多运行参数对三级混流式混输泵整体与级间气液两相增压特性的影响。研究结果表明，随着液相流量的提升，增压性能曲线由三个增压级性能逐级恶化导致的波纹状下降趋势逐渐消失。多级混输泵增压性能的显著恶化主要归因于首个增压级性能的剧烈下滑。提高液相流量能有效减轻气体积聚，其对增压性能的正面促进作用显著超过了流动分离带来的负面影响，因而增压随液相流量变化曲线呈现骤升趋势。提高入口压力有助于缓解气团聚集对增压性能的负面影响。

关键词: 泵, 混流式混输泵, 气液两相流, 气含率, 增压剧烈恶化