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A field test and numerical simulation study is carried out on the slagging problem of a 1 000 MW double-tangential coal-fired boiler during the co-firing of high ash melting point coal and low ash melting point coal. The test results show that as the proportion of low ash melting point coal increases, the slagging in the furnace shows a significant aggravation trend. When the proportion of low ash melting point coal is 50%, slight slagging occurs in the furnace. When the proportion increases to 67%, large-scale coking occurs on the bottom of the large screen heat transfer surface. When the proportion reaches 83%, the slagging situation deteriorates significantly, and the proportion of slag blocks in the furnace slag exceeds 40%. The numerical simulation results of slagging are in good agreement with the field operation test results. The results show that slagging is mainly concentrated in the front and rear wall areas, and the degree of slagging on each heat transfer surface increases with the proportion of low ash melting point coal. Although the addition of low ash melting point coal does not significantly change the near-wall temperature, the significant reduction of the ash melting point of the mixed coal is the fundamental reason for the deterioration of slagging. The operation mode of low ash melting point coal in the burner has a significant effect on slagging, especially when the low ash melting point coal is co-fired in layers D and C, the slagging trend is particularly obvious. It is recommended to prioritize the arrangement of low ash melting point coal in layers A and B, followed by layer F, and avoid co-firing low ash melting point coal in layers D and C.
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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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