深井循环通风快速空气净化系统试验研究
Experimental study on a rapid air purification system for deep mine circular ventilation
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摘要: 为了提高深井可控循环通风空气洁净度,加速爆破尘毒的过滤与排出,提出了将微纳米气泡水喷雾系统与水浴丝炭系统相结合的快速空气净化系统。基于自行设计的快速空气净化试验平台,以微纳米气泡水和雾化喷头为研究对象,优选出了雾化效果最佳的喷嘴孔径,对比了自来水与微纳米气泡水的喷雾降尘效率。并基于此平台,选定湿式喷淋纤维栅和炭式吸附网进行单因素试验,得到单一最佳水平。基于效果最佳的试验参数,进行最优组合净化试验。结果表明:在同一工况下,孔径0.4 mm的高压喷头雾化角最大,可达90 °。微纳米气泡水的喷雾降尘效率均高于自来水降尘效率,并且微纳米气泡水更易捕获呼吸性粉尘。湿式喷淋纤维栅的孔径大,更易形成大面积的水膜,扩大与水溶性气体接触的面积,过滤效率也随之增高。较厚的活性炭纤维棉具有更多孔隙和更大的接触面积,对于CO 的吸附效果更明显。快速空气净化系统的最优参数组合为:微纳米气泡水作为喷雾介质,采用0.4 mm 孔径的高压喷头,供水压力3 MPa,湿式喷淋纤维栅采用双层10目金属丝网,炭式吸附网选用5 mm活性炭纤维棉。在该最优配置下,全尘与呼尘的平均降尘效率分别为72.83 %和79.12 %, CO、H2S和SO2平均净化效率分别达到84.47 %、78.56 %、55.42 %。Abstract: To improve the air cleanliness of controllable circular ventilation in deep mines and to accelerate the filtration and discharge of blasting-related dust and toxic gases, a rapid air purification system combining a micro-nano bubble water spray system and a water bath wire-carbon system was proposed. Based on a self-designed experimental platform for rapid air purification, micro-nano bubble water and atomizing nozzles were investigated to determine the optimal nozzle aperture for the best atomization performance. The dust suppression efficiency of tap water and micro-nano bubble water sprays was compared. Single-factor experiments were conducted using a wet spray fiber grid and a carbon adsorption mesh to identify optimal individual performance parameters. Finally, an optimal combination purification experiment was performed using the best-performing parameters. The results show that under the same operating conditions, a pressure fan-shaped nozzle with a 0.4 mm aperture achieved the largest atomization angle, reaching up to 90 °. The dust suppression efficiency of micro-nano bubble water was consistently higher than that of tap water, and micro-nano bubbles more effectively captured respirable dust. Wet spray fiber grids with larger apertures formed larger water films, increasing the contact area with water-soluble gases and thereby improving filtration efficiency. Thicker activated carbon fiber cotton offered more pores and a larger surface area, significantly enhancing CO adsorption. The optimal parameter combination for the rapid air purification system was as follows: micro-nano bubble water as the spray medium; high-pressure nozzles with a 0.4 mm aperture and 3 MPa water supply pressure; wet spray fiber grid using double-layer 10-mesh metal screen; and 5 mm thick activated carbon fiber cotton for the carbon adsorption mesh. Under this optimal configuration, the total dust and respirable dust removal efficiencies reached 72.83 % and 79.12 %, respectively, while the purification efficiencies for CO, H₂S, and SO₂ were 84.47 %, 78.56 %, and 55.42 %, respectively.
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