Study on the effect of humidity on coal mine dust concentration monitoring and its compensation strategy
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摘要:
矿井环境湿度严重影响煤矿粉尘浓度监测质量，为了提高煤矿井下高湿度环境下的粉尘浓度监测精度，开展了湿度对粉尘浓度监测的影响规律和湿度补偿技术研究。在观测煤矿粉尘颗粒吸湿生长形貌特征的基础上，通过实验得到了不同湿度条件下煤矿粉尘颗粒粒径变化规律及湿度对粉尘浓度监测的影响机制：煤矿粉尘颗粒粒径随着湿度的增加呈现指数型增长趋势；当环境湿度由50%逐步增加至90%时，煤矿粉尘浓度呈现指数型增长趋势。提出一种基于不同角度散射光特性的湿度在线补偿技术，研究了环境湿度、粉尘颗粒粒径和散射光通量之间的关系，构建了湿度补偿实验模型，将湿度补偿实验模型嵌入多角度光散射粉尘浓度监测单元中，实现带湿度补偿的煤矿粉尘浓度监测。实验结果表明：带湿度补偿的多角度光散射粉尘浓度监测单元的监测误差≤11.2%，较不带湿度补偿的粉尘浓度监测单元降低了2.9%，验证了湿度补偿的有效性。
Abstract:The humidity in mines significantly affects the monitoring quality of coal mine dust concentration. This study aims to improve the precision of dust concentration monitoring in high-humidity underground coal mine conditions, through investigating the influence of humidity on dust concentration monitoring and exploring humidity compensation techniques. Based on the observations of the hygroscopic growth and morphology of coal mine dust particles, experiments were conducted to obtain the variation pattern of coal mine dust particle size under different humidity conditions and to reveal the mechanism by which humidity affects dust concentration monitoring. The particle size of coal mine dust increased exponentially with rising humidity. When environmental humidity increased gradually from 50% to 90%, the coal mine dust concentration exhibited an exponential growth trend. To address this, an online humidity compensation technique based on light-scattering characteristics with multiple angles was proposed. The relationships among environmental humidity, dust particle size, and scattered light flux were investigated. A humidity compensation experimental model was developed and integrated into a light-scattering dust concentration monitoring unit with multiple angles. In this way, humidity compensated coal mine dust concentration monitoring was achieved. Results showed that the monitoring error of the humidity-compensated multi-angle light-scattering unit was ≤11.2%, a 2.9% reduction compared to the uncompensated unit, confirming the effectiveness of the compensation method.
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图 2 粒径10 μm煤矿粉尘颗粒的吸湿生长形貌特征
Figure 2. Hygroscopic growth and morphological characteristics of coal mine dust particles with a particle size of 10 μm
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图 3 煤矿粉尘颗粒粒径与环境湿度的关系曲线
Figure 3. Relationship curve between coal mine dust particle size and environmental humidity
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图 4 不同环境湿度下的煤矿粉尘浓度变化曲线
Figure 4. Variation curve of coal mine dust concentration under different environmental humidity levels
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图 5 多角度光散射粉尘浓度监测单元
Figure 5. Light-scattering dust concentration monitoring unit with multiple angles
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图 6 中位粒径为11.3 μm的粉尘在不同湿度下的散射光通量比值曲线
Figure 6. Scattered luminous flux ratio of dust with median particle size of 11.3 μm under different humidity
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图 7 不同中位粒径粉尘在90%RH湿度下2个角度的散射光通量比值曲线
Figure 7. Scattered light flux ratio curve at two angles for dust particles with different median particle sizes under 90% RH humidity
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