Gao Libing, Liu Kai, Guo Shaoqing, Liang Lei, Li Hongyan
School of Environmental Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, People's Republic of China.
R Soc Open Sci. 2022 May 24;9(5):211961. doi: 10.1098/rsos.211961. eCollection 2022 May.
The dynamic release characteristics of Hg during low calorific value coal combustion were investigated in a combining laboratory-scale furnace coupled with atomic fluorescence spectroscopy. The results show that the sulfur has an inhibitory effect on the homogeneous oxidation of Hg in flue gas. The instant intensity of Hg release increases with increasing temperature while the amount of Hg release gradually decreases with increasing temperature. Compared with that under air, the instant intensity of Hg release under O/CO atmosphere increases to some extent with a lower decreasing rate of Hg release peak. The release ratio of elemental mercury (Hg) from Yuwu (YW) and Qinxin (QX) coal increases while that from Yonghao (YH) coal decreases under O/CO atmosphere. In the range of 800-1100°C, the release rate of Hg reaches more than 96% under the residence time of 50 s.
在实验室规模的炉体与原子荧光光谱联用装置中，研究了低热值煤燃烧过程中汞的动态释放特性。结果表明，硫对烟气中汞的均相氧化有抑制作用。汞释放的瞬间强度随温度升高而增加，而汞释放量随温度升高逐渐减少。与空气气氛相比，O/CO气氛下汞释放的瞬间强度有所增加，汞释放峰值的下降速率较低。在O/CO气氛下，榆武（YW）煤和沁新（QX）煤中元素汞（Hg）的释放率增加，而永浩（YH）煤中元素汞的释放率降低。在800-1100°C范围内，停留时间为50 s时，汞的释放率达到96%以上。
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