School of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing, China.
State Key Lab of Coal Resources and Safe Mining, China University of Mining and Technology-Beijing, Beijing, China.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2021;56(2):181-189. doi: 10.1080/10934529.2020.1859851. Epub 2020 Dec 28.
In order to clarify the influence of air velocity on the atomization effect of shearer external spray and optimize dust suppression performance, the dust removal experiment was carried out by utilizing the self-designed external spray experiment platform. The effect of three kinds of air velocity on the atomization effect of main spray parameters was investigated to clarify the influence of air velocity on the atomization effect of shearer external spray and optimize dust suppression performance. The results showed that the influence of air velocity on droplet size and distribution width of the droplet size was slightly less than the spray pressure. The average diameter of the droplet was 54.211 μm, and the particle size distribution of the droplet was more uniform and concentrated when air velocity was 2 m/s, the pressure was 5 MPa and nozzle diameter was 1.0 mm. When the air velocity was less than 2 m/s and the spray pressure was 3-5 MPa, the atomization effect was better by using 1.0 or 1.2 mm diameter nozzle. Through on-site applications and optimization, the leeward total dust removal efficiency of the shearer can reach 79.43%, and the maximum increase range can reach 18.51 percentage points. The respiratory dust removal efficiency of the shearer can reach 87.45%, and the maximum increase range can reach 11.87 percentage points.
为了阐明风速对采煤机外喷雾雾化效果的影响，优化降尘性能，利用自行设计的外喷雾实验平台进行了除尘实验。考察了三种风速对主喷雾参数雾化效果的影响，阐明了风速对采煤机外喷雾雾化效果的影响，优化了降尘性能。结果表明，风速对雾滴粒径及分布宽度的影响略小于喷雾压力。当风速为 2m/s、压力为 5MPa、喷嘴直径为 1.0mm 时，雾滴的平均直径为 54.211μm，雾滴粒径分布更加均匀集中。当风速小于 2m/s、喷雾压力为 3-5MPa 时，采用 1.0 或 1.2mm 直径的喷嘴，雾化效果更好。通过现场应用和优化，采煤机下风侧全尘降尘效率可达 79.43%，最大增幅可达 18.51 个百分点。采煤机呼吸性粉尘降尘效率可达 87.45%，最大增幅可达 11.87 个百分点。
