多级混流式混输泵气液两相增压特性

doi:10.11949/0438-1157.20240924

摘要/Abstract

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

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

中图分类号:

O 359

戴晓宇, 徐强, 杨晨宇, 苏筱斌, 郭烈锦. 多级混流式混输泵气液两相增压特性[J]. 化工学报, 2025, 76(2): 554-563.

Xiaoyu DAI, Qiang XU, Chenyu YANG, Xiaobin SU, Liejin GUO. Gas-liquid two-phase pressurization characteristics of multistage mixed-flow multiphase pump[J]. CIESC Journal, 2025, 76(2): 554-563.

图/表 10

图1 三级混流式混输泵测试平台1—储液罐;2—给水泵;3—流量调节阀;4—液相流量计;5—静态混匀器;6—三级混流式混输泵;7—扭矩转速仪;8—变频电机;9—出口控制阀;10—高压截止阀;11—气相调节阀;12—空气压缩机;13—高压储气瓶;14—气液分离器

Fig.1 Schematic of three-stage mixed-flow multiphase pump system1—liquid tank; 2—centrifugal pump; 3—flow regulating valve; 4—liquid flowmeter; 5—mixer; 6—three-stage mixed-flow pump; 7—torque tachometer; 8—variable frequency motor; 9—outlet control valve; 10—high-pressure globe valve; 11—gas-phase regulating valve; 12—air compressor; 13—high-pressure gas storage cylinders; 14—gas-liquid separator

图2 三级混流式混输泵结构图：(a)叶轮与扩压器截面及传感器布置；(b)叶轮结构

Fig.2 Structure of the three-stage mixed-flow pump: (a) impeller and diffuser cross sections and sensor layout; (b) impeller structure

表1 叶轮与扩压器结构参数

Table 1 Structural parameters of impeller and diffuser

结构参数	叶轮		扩压器
入口内径/mm	D_i1	64	D_d1	111
入口外径/mm	D_i2	107	D_d2	136
出口内径/mm	D_i3	106	D_d3	109
出口外径/mm	D_i4	133	D_d4	68
入口安放角/(°)	β_i1	23	β_d1	23
出口安放角/(°)	β_i2	30	β_d2	72
叶片数	B_i	4	B_d	7
包角/(°)	φ_i	90	φ_d	90

图3 单相水力特性：(a)增压与效率随液相流量变化曲线；(b)无量纲扬程系数随流量系数变化曲线

Fig.3 Single-phase hydraulic characteristics: (a) pressurization and efficiency curve with liquid flow rate; (b) dimensionless head coefficient curve with flow rate

图4 Surging test气液两相增压特性

Fig.4 Surging test gas-liquid two-phase pressurization characteristics

图5 单级增压特性

Fig.5 Pressurization characteristics of each booster stage

图6 三级混流式混输泵气液两相扬程系数随流量系数变化散点图

Fig.6 Scatter diagram of the gas-liquid two-phase head coefficient of the three-stage mixed-flow multiphase pump with the flow coefficient

图7 Mapping test气液两相增压特性

Fig.7 Mapping test gas-liquid two-phase pressurization characteristics

图8 不同入口压力下三级混流式混输泵的总增压性能曲线

Fig.8 Total pressurization performance curves of three-stage mixed-flow multiphase pump under different inlet pressures

图9 三个增压级在不同入口压力与液相流量下的增压随入口含气率变化曲线

Fig.9 Pressurization curves of three booster stages with inlet gas volume fraction and liquid phase flow rate under different inlet pressures

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