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The formation and emission of SO3 in coal-fired flue gas not only pose significant threats to atmospheric environments and human health but also negatively affect power plant operations. Injecting alkaline sorbents into flue gas has proven to be an effective method for SO3 removal. The removal efficiency of SO3 by injecting Na2CO3 and Ca(OH)2 absorbents was investigated under different flue gas conditions, and the removal performance was compared with that of the blended absorbents. Moreover, the physicochemical properties of the alkaline absorbents before and after the reaction were characterized using SEM, XRD, FT-IR, and XPS techniques. Based on experimental data and characterization results, the gas-solid reaction model were proposed to elucidate the mechanisms of SO3 removal by Na2CO3 and Ca(OH)2. Furthermore, the adsorption process of Na2CO3 on SO3 was simulated, and the adsorption energy was calculated and compared with that of Ca(OH)2. The results showed that, Na2CO3 demonstrated superior SO3 removal efficiency compared with Ca(OH)2, and the removal efficiency was enhanced by increasing the reaction temperature, SO3 mass concentration, absorbent stoichiometric ratio and residence time. The blended absorbent with a molar ratio of Ca:2Na:S=5.00:1.25:1.00 achieved an SO3 removal efficiency of 86.07% under practical operating conditions at a low cost. The findings indicated that the gas-solid reaction between Na2CO3 and SO3 followed the shrinking core model, while the reaction between Ca(OH)2 and SO3 adhered to the grain model. The adsorption energy of SO3 on Na2CO3 was higher than that on Ca(OH)2. This study can provide theoretical insights and technical support for efficient and cost-effective removal of SO3 from coal-fired flue gas.
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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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