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Outline
To achieve a smooth restart of the 2580 m³ blast furnace in General Ironmaking Plant of Angang Steel Co., Ltd. after unplanned long-term shutdown with heavy load for 31 days and 3 hours, a series of measures were implemented, including controlling temperature and cooling water in a staged and precise manner for furnace preservation, minimizing cooling water flow to the furnace body, adopting a concentrated and limited tuyere opening strategy during restart, setting key burden parameters with a total coke ratio of 1 000 kg/t and a final slag basicity of 1.0, and pre-injecting oxygen prior to blowing-in. The results showed that full tuyere opening was achieved 45 hours after restart, and the designed production capacity was reached within 5 days. The blast furnace productivity remained stable at 2.0 t/(m³·d), and the physical heat of hot metal exceeded 1 450 °C. Common issues encountered during hearth freezing treatment, such as tuyere slagging and damage were avoided, and the first iron tapping was accomplished smoothly. This practice provides a valuable reference for managing unplanned long-term shutdowns with heavy load and mitigating hearth freezing in blast furnaces.
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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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