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Outline
Aiming at the challenge of efficient treatment and utilization of oil‑contaminated sludge generated during petroleum exploitation，processing and gathering-transportation，the distribution characteristics of turbulent flow field as well as the movement and distribution behavior of oil‑contaminated sludge particles were conducted.A DN50 axial‑flow hydrocyclone model was established and verified by experimental tests.The Eulerian multiphase flow model and RSM turbulence model was adopted to explore the turbulent desorption mechanism of oil‑contaminated sludge under rotating flow field.The results show that within the research range （flow rate of 2~6 m³/h，overflow ratio of 2%~20%），the optimal operating conditions are flow rate of 4.5 m³/h and overflow ratio of 10%，under which the crude oil recovery rate and sludge reduction rate reach 96.72% and 99.27% respectively.During the treatment of oil‑contaminated sludge，variation of flow rate affects both the rotating separation process and the desorption process of oil‑contaminated sludge simultaneously.The influence of overflow ratio on the rotating separation process is significantly greater than that on the desorption process of oil‑contaminated sludge.The turbulent effect of the rotating flow field enables efficient desorption of oil‑contaminated sludge.This study provides a reference for the industrial application of a two‑stage rotating process integrating "intensive turbulent desorption" and "enhanced cyclonic separation".
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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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