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Outline
With the blast furnace coal injection system taken as the research object, a modified equivalent heating value (Qe) calculation model was established based on Hess's law and thermochemical principles which effectively quantified the heat expenditure effects of processes including organic decomposition, moisture gasification, desulfurization, and ash slagging. The results showed that constrained by the reducing atmosphere and endothermic reactions, the actual effective heat contribution of coal powder was only 45%~50% of its total theoretical heat release. Particularly, ash composition exerted a significant non-linear influence on slagging heat consumption. For high-silica-alumina acidic coal with acidic ash, large amounts of flux were required, resulting in a slagging heat penalty approximately 3.6 times that of low-ash coal. Furthermore, a Qe-based cost-performance index (k) showed that pulverized coal economy was governed by effective heat contribution, slagging heat from ash, grindability, and overall cost. High-volatile bituminous coal, though lower in calorific value, remained economical due to low ash, easy grinding, and low slagging heat. Some high-calorific anthracites lost value from higher slagging and grinding costs. This provides a theoretical basis for steel enterprises to optimize coal blending based on use value, thereby achieving cost reduction and efficiency improvement.
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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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