Yueyuan Liu, Lide Fang
Flow measurement plays an important role in industrial production, process control and energy utilization. The steam flow is affected by the state of steam properties and the design of the steam flowmeter during the measurement process, resulting in low measurement accuracy. Based on the combined measurement method of differential pressure flowmeter and vortex flowmeter, an integrated flow measurement device that integrates averaging-velocity tube and piezoelectric vortex flowmeter is proposed in this paper. It combines the structural features and advantages of the two flowmeters...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.037
· Download
Ning Zhao, Yajing Song, Longlong Wang, Chenguang Song, Shuanzhu Zhang
Based on the electromagnetic wave propagation principle, a prediction model based on the phase difference of coaxial lines to measure the void fraction of the slug flow is proposed, and experiments on vertical tube slug flow are conducted under 70 working conditions. A new mixing dielectric constant measurement model is established by adding a phase mixer device to the sensor to stir the slug flow into a popular and stable homogeneous flow. The homogeneous flow under the same experimental conditions is used as the reference true value of the slug flow measurement section void fraction model,...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.036
· Download
S. Schmelter, S. Knotek, M. Olbrich, M. Bär
Slug flow is a common flow pattern, which is often accompanied by undesired effects, like pressure loss or vibrations, leading to large errors in multiphase flow metering. Because these undesired effects strongly correlate with the frequency of slug occurrence, this parameter is of special interest. In this paper, different slug frequency calculation methods are applied to data from multiphase flow simulations and corresponding high-speed video observations for six test cases within the plug / slug flow regime. Commonly used methods, like power spectral density (PSD) or calculating the mean...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.035
· Download
W. M. Dlamini, R. M. Molefe
The National Metrology Institute of South Africa’s (NMISA) gas flow laboratory uses TMFCs to control gas flow rate during calibration of gas flow meters. The TMFC is connected upstream of the unit under test (UUT) during calibration. The laboratory performs gas flow calibrations in the range 5 mL/min – 50 L/min using nitrogen as flow medium. The gas temperature at the UUT’s location downstream of an TMFC has been found to fluctuate proportionally to the change in the flow rate at flow rates above 250 mL/min and below 22.5 L/min. This temperature fluctuation has a significant effect on...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.034
· Download
Wu Shijie, Xu Jianhang, Zheng Chuanbo
The main sources of domestic pipeline natural gas are central Asia, the Tarim Basin, the Sichuan Basin, and the Zhonghai Oil and Gas Field, etc. Due to the large geographical differences in gas sources, the components of natural gas are quite different. Therefore, accurate analysis of natural gas composition and calculation of the corresponding compression factor is an important part of the natural gas custody transfer process. There is a certain proportion of neopentane in current domestic natural gas, but there are no calculation parameters of neopentane in various corresponding...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.033
· Download
Y. W. Liu, L. Zhou, C. Li, S. Q. Fu, Z. X. Jin, Y. Chen
The traditional volume measurement method of natural gas is greatly affected by changes in temperament conditions, thus affecting the normal trade measurement, and can no longer adapt to the current domestic gas transmission status of multiple gas sources.In this context, this study proposes a Sound and light association method measurement technology not limited by the natural gas component to directly determine the natural gas heat generation, thus realizing energy measurement. Combined to the actual operation of natural gas station, the data of multiple multi- component gas standard...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.032
· Download
Gong Lei, Yang Lingshan, Yu Chunyang, Zhang Yue
Online/remote calibration is the transformation and expansion of traditional measurement. Its development will play a certain role in strengthening measurement management, improving the overall strength and level of measurement, and promoting trade and economic development. In this paper, a set of on-line/remote detection standard devices with a flow range of (0.4 ~ 400) m³/h, expanded uncertainty: U ≤ 0.33 %, k = 2 was designed and developed. Rely on the Internet + calibration mode, use the wireless Internet to send signals from the laboratory to the standard testing module, establish a...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.031
· Download
C. Y. Yu, L. L. Zhang, H. J. Yang, X. Liu, X. Li
In my country's primary energy consumption structure, the proportion of natural gas is increasing. Accurate and reasonable measurement of natural gas is one of the important links in natural gas utilization, which has huge social and economic benefits. The Chongqing branch of the National Petroleum and Natural Gas Large-flow Detection Station has established a set of standard equipment for real-flow detection of natural gas. The device uses 10 critical flow venturi nozzles with different throat diameters in parallel, and uses the 1.6 MPa natural gas stored in the upstream 5500 m³ spherical...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.030
· Download
Huichao Shi, Lianfeng Cheng, Tao Meng, Wenlong Li
Based on the initial sensitivity of chaotic oscillator which is sensitive to regular signal and immune to noise simultaneously, the chaotic signal detection method can detect the signal submerged in the noise stronger than the measured signal, and relevant research has been applied to measure weak signals submerged by large noise. In this paper, chaotic oscillator is applied in flow fluctuation signal detection of a flow standard device, and a new detection model is proposed to detect the fluctuation signal using the maximum Lyapunov exponent to obtain the threshold value and monitor motions...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.029
· Download
Huaiming Shen, Qing Guo, Xiaopeng Li, Tao Meng, Zhiming Yang, Huichao Shi
In order to solve the problem that it is difficult to monitor the flow field state in the pipeline during thecalibration process of the flowmeter, this paper proposes a method to monitor the symmetrical state of theflow field in the pipeline by using the cross four-channel flowmeter with different sound channel velocity. The signal decomposition method based on singular value decomposition (SVD) is separate the noise signal from the single of channel measurement result, the velocity distribution curve of the medium in the pipeline is obtained by using 8 acoustic channel velocities lo...
FLOMEKO 2022
· TC9
· 2022
· 10.21014/tc9-2022.028
· Download