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Outline
Aiming at the dust diffusion phenomenon in the process of grab unloading, the dust-isolation with air curtain and negative pressure suction technology were combined, and the CFD-DEM two-way coupling simulation method was used to study the comprehensive dust suppression system of dust-isolation surrounded by air curtain and negative pressure suction. Through the performance simulation study of the dust-isolation surrounded by air curtain, it is concluded that the effective block of dust can be achieved when the jet velocity of the air curtain is greater than 8 m/s. At the same time, based on the theory of negative pressure suction, the relationship between the mass flow of air flow of the suction port and the unloading time was deduced by CFD fluid mechanics method, and the simulation model of grab unloading was established. The flow field distribution of the unloading plane and the mass flow rate of dusty air flow escaping from the dust-isolation hopper mouth plane were extracted by simulation to reflect the movement of the dusty air flow inside the hopper. The movement law and dust suppression effect of unloading dust before and after the installation of air curtain and negative pressure suction device were compared and analyzed through tsets. The results show that compared with traditional grab, the instullation of air curtain and negative pressure suction device reduced the maximum mass concentration of dust at the hopper mouth by 738.3 mg/m3, which is reduced by about 95.3%, and the complete settlement time of dust is shortened by 60%. The results provide a reference for efficiently solving the problem of dust diffusion in unloading.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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