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Biomass contains a high content of alkali metal elements, which can cause serious slagging problems during the combustion process. Coal gangue is a kind of bulk solid waste, and its resource utilization is an urgent need. In order to solve the problem of biomass combustion slagging and coal gangue utilization, coal gangue was used as an additive and mixed with sunflower straw for combustion. Physical and chemical characterization of the burned ash samples were carried out using thermogravimetric analysis (TG-DTG), inductively coupled plasma spectrometry (ICP-AES), and ash melting point tester. The effects of temperature and ratio on the combustion performance and slagging of mixed fuels were also investigated. The research results show that, during the combustion of sunflower straw, the addition of a small amount of gangue significantly increased the alkali metal content in the ash. More of these metals were converted into high-melting-point silica-aluminates, which were fixed in the ash samples, while the gaseous alkali metal content decreased. As a result, the tendency for slagging during combustion was reduced. At the same time, the sunflower straw reduced the ignition point and burnout temperature of the gangue, thereby promoting its combustion. The synergistic effect was obvious. When the proportion of coal gangue was 20%, the flammability index of the fuel reached 9.36×10–4%/(min·℃), and the comprehensive combustion characteristics index reached 42.6×10–7%/(min2·℃3). The combustion performance was optimal, with a softening temperature of 1 470 ℃, and the tendency for slagging was significantly reduced.
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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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