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Based on computational fluid dynamics (CFD) method, a multiphase VOF model and Realizable k-εturbulence model were used to simulate flow characteristics of a large bottom-blown furnace with different blowing modes, and analyze a pre-stabilization process, motion characteristics of blown gas, gas-matte-slag interaction characteristics and mixing effect in molten pool. The results show that the large bottom-blown furnace has two oxygen lances for blowing, which can altogether generate an enhanced pneumatic agitation zone, resulting in a remarkable gas-matte-slag interaction in the furnace, thus providing good dynamic condition for the large bottom-blown furnace. The furnace with double lances blowing at an angle of 9° can bring a better agitation effect, leading to the gas content at a rate of 2.70%, average speed of 0.20 m/s and average turbulence energy of 0.059 m2/s2 in the molten pool. There is severe internal disturbance and less splashing of melt in the molten pool, which is beneficial to improving smelting efficiency.
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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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