并联孔板计量装置流量动态重分配规律研究
Research on flow dynamic redistribution pattern of parallel orifice metering device
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- 引用格式:
-
田园,李亚茜,沈群.并联孔板计量装置流量动态重分配规律研究[J].天然气与石油,2023,41(3):6-13.doi:10.3969/j.issn.1006-5539.2023.03.002
TIAN Yuan, LI Yaxi, SHEN Qun.Research on flow dynamic redistribution pattern of parallel orifice metering device[J].Natural Gas and Oil,2023,41(3):6-13.doi:10.3969/j.issn.1006-5539.2023.03.002
- DOI:
- 10.3969/j.issn.1006-5539.2023.03.002
- 作者:
- 田园1 李亚茜2 沈群3
TIAN Yuan1, LI Yaxi2, SHEN Qun3
- 作者单位:
- 1. 重庆科技学院石油与天然气工程学院, 重庆 401331; 2. 中国石化西南油气分公司, 四川 成都 610041; 3. 中国石油西南油气田公司重庆气矿, 重庆 401331
1. Institute of Natural Gas Engineering, Chongqing University of Science & Technology, Chongqing, 401331, China; 2. Sinopec Southwest Oil and Gas Branch, Chengdu, Sichuan, 610041, China; 3. PetroChina Southwest Oil & Gasfield Company Chongqing Gas Mine, Chongqing, 401331, China
- 关键词:
- 并联孔板计量装置;动态重分配;流场模拟;计量偏差;补偿系数
Parallel orifice metering device; Dynamic redistribution; Flow field simulation; Measurement deviation; Compensation coefficient
- 摘要:
管输天然气多采用并联孔板计量装置进行计量,但定期清洗时,孔板提到上腔后,必然导致管路中流量动态重分配,产生计量误差,直接影响企业的经济效益。目前尚无针对流量动态重分配造成计量误差的主要影响因素及补偿方法的定性、定量分析研究,为此基于计算流体力学基本原理,应用Fluent软件构建了并联孔板计量装置内流场三维模型,分析了孔板周期清洗时的流量动态重分配规律。研究结果表明:1)流量补偿系数与压力、温度无关;2)相同孔径孔板流量计并联时补偿系数随总气量、管径、相对密度、并联管道数的增加而增大,随直径比的增加而减小,其中直径比是主控因素;3)不同孔径孔板流量计并联时补偿系数随总气量、管径、相对密度的增加而增大,随并联孔径比的增加而显著减小,其中并联孔径比是主控因素。依据研究结果构建了流量补偿系数修正方程,经现场测试,计量偏差显著降低,大大减少了因计量不准确带来的潜在利润流失。
The parallel orifice plate is usually used to measure natural gas transported by pipeline. However, when the orifice plate is raised to the upper chamber during periodic cleaning, it will inevitably lead to flow dynamic redistribution in the pipeline, resulting in measurement errors that directly affect the profit of the enterprises. At present, there is no qualitative and quantitative analysis and research on the influencing factors and compensation methods of measurement error caused by flow dynamic redistribution. Therefore, based on the basic principle of computational fluid dynamics, Fluent software was used to build a threedimensional flow field model in the parallel orifice metering device, and analyze the flow dynamic redistribution pattern during the periodic cleaning of the orifice plate. The research results indicate the following. First, the flow compensation coefficient is independent of pressure and temperature. Second, in the parallel metering device with the same aperture, the compensation coefficient increases with the increase of total gas volume, pipe diameter, relative density, and the number of parallel pipes, and decreases with the increase of pipe diameter ratio, of which the pipe diameter ratio is the main controlling factor. Third, in the parallel metering device with different apertures, the compensation coefficient increases with the increase of total gas volume, pipe diameter and relative density, and decreases significantly with the increase of parallel aperture diameter ratio, of which the parallel aperture diameter ratio is the main controlling factor. Furthermore, based on the research results, the flow compensation coefficient correction equation was developed, and the measurement deviation is significantly reduced by field test, which greatly reduces the potential profit loss caused by inaccurate measurement.
