煤矿主要通风机风量传感器布置方法研究
Study on arrangement method of air quantity sensor for main fan in coal mine
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摘要: 针对煤矿主要通风机风量目前采用的前置风硐多点测量方法中,存在测量误差大的问题,建立了常见3种风硐的仿真模型,分析测风传感器安装所造成的风流分布变化规律。由风硐纵向速度分布云图得到传感器安装支架截面处由于受支架干扰风流分布变化剧烈;超前支架截面200 mm后,风速分布趋于均匀,影响减小,超前支架250 mm影响最小,可作为传感器测头安装参考位置。以方形风硐为例,进行实验验证,结果表明:在选取的8个工况点,传感器测头安装在支架截面处时测量误差均最大,随着传感器前置的距离增加,测量误差逐渐下降,在250 mm处最小。
Abstract: There is a problem of large measurement error in the front fan drift multi-point measurement method of the air quantity of the main fan currently in use. To solve this problem, the simulation model for three common fan drifts is established, and the variation law of airflow distribution caused by the installation of the wind sensor is analyzed. According to the cloud map of longitudinal velocity distribution in the fan drift, the airflow distribution at the section of the sensor mounting bracket changes dramatically due to the interference of the bracket. After 200 mm of the leading bracket section, the wind velocity distribution tends to be uniform and the influence of the bracket on the airflow is reduced. The influence is minimal at the leading bracket of 250 mm, which can be used as the reference position for the sensor probe installation. Taking the square fan drift as an example, the experimental verification is carried out. The results show that: the measurement error is the greatest when the sensors are installed at the cross-section of the bracket at the selected 8 working points. With the distance increase of the sensor is mounted forward, the measurement error decreases gradually and reaches the minimum at 250 mm.
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Keywords:
- fan drift /
- main fan /
- multi-point wind measurement /
- air volume measurement /
- sensor position
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