The mercury emission was obtained by measuring the mercury contents in flue gas and solid samples in pulverized coal (PC) and circulating fluidized bed (CFB) utility boilers. The relationship was obtained between the mercury emission and adsorption characteristics of fly ash. The parameters included unburned carbon content, particle size, and pore structure of fly ash. The results showed that the majority of mercury released to the atmosphere with the flue gas in PC boiler, while the mercury was enriched in fly ash and captured by the precipitator in CFB boiler. The coal factor was proposed to characterize the impact of coal property on mercury emissions in this paper. As the coal factor increased, the mercury emission to the atmosphere decreased. It was also found that the mercury content of fly ash in the CFB boiler was ten times higher than that in the PC boiler. As the unburned carbon content increased, the mercury adsorbed increased. The capacity of adsorbing mercury by fly ash was directly related to the particle size. The particle size corresponding to the highest content of mercury, which was about 560 ng/g, appeared in the range from 77.5 to 106 µm. The content of mesoporous (4–6 nm) of the fly ash in the particle size of 77.5–106 µm was the highest, which was beneficial to adsorbing the mercury. The specific surface area played a more significant role than specific pore volume in the mercury adsorption process.

通过测量粉煤（PC）和循环流化床（CFB）电站锅炉中烟气和固体样品中的汞含量来获得汞排放。得到了汞排放与粉煤灰吸附特性之间的关系。参数包括未燃烧的碳含量，粒径和飞灰的孔结构。结果表明，PC锅炉的烟气中大部分汞释放到大气中，而飞灰中的汞富集并被CFB锅炉中的沉淀器捕获。本文提出了煤因子来表征煤性质对汞排放的影响。随着煤因子的增加，向大气的汞排放减少。还发现，CFB锅炉中粉煤灰的汞含量比PC锅炉高十倍。随着未燃烧碳含量的增加，吸附的汞增加。粉煤灰吸附汞的能力与粒径直接相关。对应于最高汞含量的粒径约为560 ng / g，出现在77.5至106 µm的范围内。颗粒尺寸为77.5-106 µm的粉煤灰的中孔（4–6 nm）含量最高，这有利于汞的吸附。在汞吸附过程中，比表面积比比孔体积发挥更大的作用。粉煤灰吸附汞的能力与粒径直接相关。对应于最高汞含量的粒径约为560 ng / g，出现在77.5至106 µm的范围内。颗粒尺寸为77.5-106 µm的粉煤灰的中孔（4–6 nm）含量最高，这有利于汞的吸附。在汞吸附过程中，比表面积比比孔体积更重要。粉煤灰吸附汞的能力与粒径直接相关。对应于最高汞含量的粒径约为560 ng / g，出现在77.5至106 µm的范围内。颗粒尺寸为77.5-106 µm的粉煤灰的中孔（4–6 nm）含量最高，这有利于汞的吸附。在汞吸附过程中，比表面积比比孔体积更重要。