管内相分隔双压差在多相流双参数测量中的应用

doi:10.11949/0438-1157.20201008

摘要/Abstract

摘要：

应用管内相分隔技术可以产生沿管道横截面的径向压差和沿管壁变化的轴向压差，研究表明，径向压差与两相流的总流量和相含率呈一定函数关系，若轴向压差与两相流的总流量和相含率也呈一定的函数关系，那么就可以通过双压差（轴向压差和径向压差）的联立实现多相流双参数的测量。以油水两相流为例，系统研究了基于管内相分隔产生的轴向压差在多相流测量的理论机理，并结合径向压差进行了实验验证。结果表明，在管内相分隔状态下，旋流器下游某两截面之间的轴向压差与油水两相流的总流量和体积含油率呈一定的函数关系，两者的实验值和理论值之间的相对误差分别在±1.05%和±9.84%以内；通过双压差的联立，可以求出某一状态下两相流的总流量和相含率，两者的实验值和理论值之间的相对误差分别在±1.13%和±6.89%以内，验证了基于管内相分隔双压差在多相流双参数测量应用的可行性。

关键词: 管内相分隔, 轴向压差, 径向压差, 双压差, 多相流, 双参数测量, 实验验证

Abstract:

The axial differential pressure and radial differential pressure can be generated by phase-isolation method. Once measuring the radial differential pressure between the pipe wall and pipe center of a cross section downstream of the swirler, the mass flowrate and phase holdup can be determined if either of the two parameters was known. If axial differential pressure also has a certain relationship with the mass flowrate and phase holdup, then multiphase flow double-parameter metering can be realized by dual differential pressure (the axial differential pressure and the radial differential pressure). Taking oil-water two-phase flow as an example, the mechanism of axial differential pressure used in multiphase flow measurement was studied and the experimental verification was carried out. The results show that the axial pressure difference between certain two sections downstream of the cyclone is a certain function of the total flow rate and volume oil content of the oil-water two-phase flow under the state of phase separation in the pipe. The relative error between the experimental value and the theoretical value of the two is within ±1.05% and ±9.84% respectively. Besides, the mass flowrate and oil cut can be determined by dual differential pressure with the relative errors are within ±1.13% and ±6.89% respectively, which verified the application feasibility of dual differential pressure used in multiphase flow double-parameter metering based on phase-isolation.

Key words: phase-isolation in-pipe, axial differential pressure, radial differential pressure, dual differential pressure, multiphase flow, double-parameter metering, experimental validation

中图分类号:

O 359

王帅,李庆芝,陈建英,王栋,牛棚满,董宝光. 管内相分隔双压差在多相流双参数测量中的应用[J]. 化工学报, 2020, 71(12): 5515-5520.

WANG Shuai,LI Qingzhi,CHEN Jianying,WANG Dong,NIU Pengman,DONG Baoguang. Dual differential pressure used in multiphase flow double-parameter metering based on phase-isolation[J]. CIESC Journal, 2020, 71(12): 5515-5520.

图/表 6

图1 实验系统和装置

Fig.1 Experimental system and device

图2 单相水质量流量与壁面轴向压差（不考虑重位压降）的平方根之间的关系

Fig.2 Relationship between Qm and square root of ΔPa (irrespective of gravity pressure drop) of single-phase flow

表1 旋流器下游0.075 m和0.115 m的横截面体积含油率实验值和理论值之间的关系

Table 1 Relationship between experimental value and theoretical value of λo at 0.075 m and 0.115 m downstream of swirler

ΔP_a/ Pa	Q_m/ (kg·s^-1)	ζ	λ_o		Relative error/%
ΔP_a/ Pa	Q_m/ (kg·s^-1)	ζ	Theoretical value	Experimental value	Relative error/%
651.70	0.84826	1.08749	0.04415	0.04799	8.70
378.14	0.78767	0.87470	0.05413	0.05846	7.99
283.06	0.73025	0.80501	0.07786	0.07020	-9.84
178.59	0.67239	0.67763	0.09220	0.08344	-9.50
59.65	0.61514	0.38692	0.10326	0.09927	-3.86

表 2 旋流器下游0.075 m和0.115 m的横截面质量流量实验值和理论值之间的关系

Table 2 Relationship between experimental value and theoretical value of Qm at 0.075 m and 0.115 m downstream of swirler

ΔP_a/ Pa	λ_o	ζ	Q_m/(kg·s^-1)		Relative error/%
ΔP_a/ Pa	λ_o	ζ	Theoretical value	Experimental value	Relative error/%
651.70	0.04799	1.08749	0.83948	0.84826	1.05
378.14	0.05846	0.87470	0.78549	0.78767	0.28
283.06	0.07020	0.80501	0.73191	0.73025	-0.23
178.59	0.08344	0.67763	0.67604	0.67239	-0.54
59.65	0.09927	0.38692	0.61850	0.61514	-0.54

图3 不同ΔPr和ΔPa下Qm随λo的变化规律（旋流器下游0.075 m截面）

Fig.3 Changing relationship of Qm with λo under different ΔPr and ΔPa at 0.075 m downstream of swirler

表3 旋流器下游0.075 m处双压差测量油水两相流双参数实验值和理论值的对比

Table 3 Comparison of experimental value and theoretical value of double-parameter metering of oil-water two-phase flow at 0.075 m downstream of swirler

ΔP_r/ Pa	ΔP_a/ Pa	λ_o			Q_m/(kg·s^-1)
ΔP_r/ Pa	ΔP_a/ Pa	Experimental value	Theoretical value	Relative error/%	Experimental value	Theoretical value	Relative error/%
9990.6	651.7	0.04799	0.05130	6.89	0.8483	0.8387	-1.13
8749.4	378.1	0.05846	0.06018	2.94	0.7877	0.7845	-0.40
7577.6	283.1	0.07020	0.07423	5.74	0.7303	0.7304	0.02
5435.6	59.6	0.09927	0.1012	1.95	0.6151	0.6164	0.21

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