基于变面积调节阀的差压式流量测量方法

doi:10.11949/0438-1157.20251097

摘要/Abstract

摘要：

相比传统的差压式流量计，基于调节阀的流量测量方法，无需额外节流装置且量程比更大。通过实验，研究了调节阀不同开度下气液两相的流量-压差关系，建立了流量与压差、开度的测量模型。该模型结果显示，流量系数与阀门开度呈良好线性，且气体的可压缩性不影响其流量系数标定。在29%-66%的阀门开度范围和10-180 kPa的压降范围内，90%以上的液相和气相质量流量数据点相对误差小于±3%。不同开度下，气、液流量系数比值都接近1.10，利用液相流量系数乘以1.10并代入公式计算，所得气相质量流量92.9%的数据点相对误差小于±5%，可在工程中使用。在已进行的实验工况范围内，调节阀测水和空气流量在误差±5%以内的量程比分别能达到1：23和1：14。

关键词: 流量测量, 差压式流量计, 流量特性, 调节阀

Abstract:

Compared with traditional differential pressure flowmeters, the flow measurement method based on a regulating valve eliminates the need for an additional throttling device and provides a wider turndown ratio. To explore its feasibility, experiments were conducted to investigate the relationship between flow rate and differential pressure under various valve openings for gas-liquid two-phase flow. A measurement model correlating mass flow rate with differential pressure and valve opening was established. The model was then used to derive calculation formulas for the mass flow rates of water and air. Validation results indicate that the relative error of the water mass flow calculation formula remains below 5% for 93.8% of the data points, while the gas mass flow calculation formula achieves a relative error of less than 5% for 92.9% of the data points, confirming its suitability for engineering applications. Within the tested experimental conditions, the turndown ratios for measuring water and air flow rates, both within a 5% error margin, reach 1:23 and 1:14, respectively. These results validate the practicality and reliability of using a variable area regulating valve for differential pressure-based flow measurement, offering a promising alternative for industrial flow metering systems.

Key words: flow measurement, differential pressure flowmeter, flow characteristic, control valve

中图分类号:

TH814

刘灏, 吴金凤, 李露露, 徐强. 基于变面积调节阀的差压式流量测量方法[J]. 化工学报, DOI: 10.11949/0438-1157.20251097.

Hao LIU, Jinfeng WU, Lulu LI, Qiang XU. Differential pressure flow measurement method based on variable area regulating valve[J]. CIESC Journal, DOI: 10.11949/0438-1157.20251097.

图/表 16

图1 系统示意图

Fig. 1 Schematic diagram of the system

图2 测试段示意图

Fig. 2 Schematic diagram of the test section

图3 开度100%下电动调节阀几何模型与基础尺寸

Fig. 3 Geometric model and basic dimensions of the electric control valve at 100% opening degree

图4 液相质量流量随压差平方根变化规律

Fig. 4 Variation law of liquid - phase mass flow rate with the square root of pressure difference

图5 液相流量系数随开度的变化

Fig.5 Variation of liquid - phase flow coefficient with opening degree

表1 各开度下的相对误差表

Table 1 Relative errors at different openings

K	$α D P 1$	$α D P 2$	$α D P 3$
0.29	-9.5%	-8.8%	-10.1%
0.34	2.5%	1.9%	2.5%
0.41	3.6%	3.2%	3.5%
0.48	2.2%	2.2%	2.4%
0.54	-1.3%	-1.2%	-1.0%
0.6	-0.4%	0.1%	0.0%
0.66	-0.3%	-0.7%	-0.8%

表1 各开度下的相对误差表

Table 1 Relative errors at different openings

K	$α D P 1$	$α D P 2$	$α D P 3$
0.29	-9.5%	-8.8%	-10.1%
0.34	2.5%	1.9%	2.5%
0.41	3.6%	3.2%	3.5%
0.48	2.2%	2.2%	2.4%
0.54	-1.3%	-1.2%	-1.0%
0.6	-0.4%	0.1%	0.0%
0.66	-0.3%	-0.7%	-0.8%

图6 液相质量流量误差

Fig.6 Liquid phase mass flow error

图7 不同压力下气相质量流量随压差平方根变化规律

Fig.7 Variation law of gas - phase mass flow rate with the square root of pressure difference under different pressures

图8 不同压力下气相质量流量随2ρΔP变化规律

Fig.8 Variation law of mass flow rate with 2ρΔP under different outlet pressures

图9 三组压差点质量流量随压差平方根的变化规律

Fig.9 Variation law of mass flow rate at three pressure - taking points with the square root of pressure difference

图10 不同开度下质量流量随压差平方根变化规律

Fig.10 Variation law of mass flow rate with the square root of pressure difference at different opening degrees

图11 气相流量系数随开度变化曲线

Fig.11 Curve of gas - phase flow coefficient variation with opening degree

图12 气相质量流量的误差

Fig.12 Gas phase mass flow error

图13 不同开度下气、液两相流量系数比值

Fig.13 Ratio of gas - and liquid - phase flow coefficients at different opening degrees

图14 基于液相流量系数标定的气相流量的误差

Fig.14 Error in gas phase flow rate based on liquid phase flow coefficient calibration

图15 不同开度下水和空气在出口压力0.5MPa下的流量测量范围

Fig.15 Flow - measurement ranges of water and air at an outlet pressure of 0.5 MPa under different opening degrees

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