【摘要】：為了分析煤礦轉(zhuǎn)載點(diǎn)誘導(dǎo)氣流對(duì)噴霧降塵過程中霧化粒度的影響,采用計(jì)算流體力學(xué)(computational fluid dynamics,CFD)離散相模型的粒子跟蹤技術(shù),模擬了不同誘導(dǎo)氣流條件下霧滴粒徑的分布特性。分析結(jié)果表明:在誘導(dǎo)氣流的影響下,霧滴顆粒向?qū)Я喜鄢隹谄泼黠@,粒徑統(tǒng)計(jì)項(xiàng)D[3,2]和D[4,3]隨誘導(dǎo)氣流風(fēng)速的增加而減小,減幅分別為17.17%和16.19%;同時(shí),霧化壓力的增大,提高了霧滴顆粒發(fā)生二次破碎的強(qiáng)度,導(dǎo)致霧化粒度隨壓力的增大而減小。根據(jù)結(jié)論,對(duì)轉(zhuǎn)載點(diǎn)高壓噴霧降塵系統(tǒng)進(jìn)行了改進(jìn),現(xiàn)場(chǎng)噴霧壓力由1.5 MPa提高到6.2 MPa,調(diào)整霧化場(chǎng)軸向橫截面與誘導(dǎo)氣流方向之間呈30°夾角,現(xiàn)場(chǎng)實(shí)踐表明:相對(duì)于改進(jìn)前,轉(zhuǎn)載點(diǎn)全塵濃度和呼吸性粉塵濃度分別降低了88.60%和78.96%。
[Abstract]:In order to analyze the influence of induced airflow at transfer point on atomization particle size in the process of spray dust reduction, particle tracking technique based on the discrete phase model of computational fluid dynamics (computational fluid) was used to simulate the particle size distribution characteristics of droplets under different induced airflow conditions. The results show that under the influence of induced air flow, the exit drift of droplet guide tank is obvious, and the statistical items D [3n 2] and D [4N 3] decrease by 17.17% and 16.19% respectively with the increase of induced wind velocity, and the atomization pressure increases. The strength of the second breakup of droplet particles is increased, and the atomization particle size decreases with the increase of pressure. According to the conclusion, the high pressure spray dedusting system at the transfer point was improved, the field spray pressure was increased from 1. 5 MPa to 6. 2 MPa, and the angle between the axial cross section of the atomization field and the induced airflow direction was adjusted 30 擄. The field practice shows that: compared with before the improvement, The total dust concentration and respiratory dust concentration were decreased by 88.60% and 78.96%, respectively.
【作者單位】： 遼寧工程技術(shù)大學(xué)安全科學(xué)與工程學(xué)院;礦山熱動(dòng)力災(zāi)害與防治教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51274116)
【分類號(hào)】：TD714.4

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本文編號(hào)：2155662