金属矿山气-水喷头雾化特性及降尘能力实验研究

来源期刊:中南大学学报(自然科学版)2020年第1期

论文作者:王亚朋 蒋仲安 许峰

文章页码:184 - 193

关键词:气-水喷雾;高溜井;雾滴粒径;降尘;气水流量比

Key words:gas-water spray; high ore pass; droplet size; dust reduction; gas-water flow ratio

摘    要:为分析金属矿山多中段高溜井喷头雾化特性及其降尘效果,建立高溜井喷雾降尘实验平台。采用激光粒径分析仪及喷雾实验设备对新型气-水喷头雾化特性、冲击气流对喷雾捕尘能力影响规律进行研究分析。研究结果表明:气、水流量比是影响新型气-水喷头雾化效果的关键因素;当喷头工作时气、水流量比为100~150时,雾化效果最佳,最佳气压和水压区间分别为[0.4, 0.6] MPa和[0.3, 0.5] MPa,雾滴粒径分布在15~35 μm范围内;在最佳气压和水压区间内,雾化角度随气压的增加而增大,随水压先增大后减小,最大雾化角度为40°,调整气压是优化雾化角度的主要手段;溜井卸矿冲击气流对喷雾雾滴粒径影响较大,喷雾捕尘能力与冲击气流速度呈负相关。

Abstract: In order to analyze the atomization characteristics and dust-reducing effect of high ore pass nozzles in metal mines, a high ore pass spray dust-reducing experimental platform was established. The laser particle size analyzer and spray experiment equipment were used to study the atomization characteristics of the new gas-water nozzle and the influence law of the impact gas flow on the spray dust-collecting ability. The results show that the gas-water flow ratio is the key factor affecting the atomization effect of the new gas-water nozzle. When the ratio of gas and water flow is 100-150, the atomization effect is the best. The best pressure ranges of gas and water are [0.4, 0.6] MPa and [0.3, 0.5] MPa, respectively. In the above range of gas-water flow ratio, the droplet size distribution is in the range of 15-35 μm. The atomization angle increases with the increase of gas pressure in the optimal gas-water flow ratio range. The atomization angle first increases and then decreases with the increase of the water pressure, the maximum atomization angle is 40 °, so the adjustment of air pressure is the main means to optimize the atomization angle. The impact gas flow induced by the unloading of the ore pass has a great influence on the particle size of the spray droplets, and the spray dust-collecting ability is negatively correlated with the velocity of the impinging gas flow.

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