Ma Anjun, Zhao Shilin, Luo Hui, Sun Kang, Li Hesong, Zhu Yanqun, Sun Zhiqiang
School of Energy Science and Engineering, Central South University, Changsha 410083, China.
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China.
ACS Omega. 2022 Aug 25;7(35):31205-31217. doi: 10.1021/acsomega.2c03449. eCollection 2022 Sep 6.
In this work, the effects of coal-fired flue gas components (O, CO, SO, and NO) on the Hg removal by the promising mercury removal adsorbent mechanochemical S-modified petroleum coke were characterized and analyzed in terms of the Hg removal efficiency, mercury adsorption capacity, and mercury mass balance. The results show that the mechanochemical S-modified petroleum coke with a theoretical sulfur content of 21% (named TSC-21) is the best candidate for mercury removal based on the Hg removal efficiency, Hg removal capacity, and difference ratio of Hg removal capacity (anti-interference ability) in the basic and full-component simulated flue gas atmosphere (N + O + CO, N + O + CO + SO + NO). The maximum value (MV) and stable value (SV) of the Hg removal efficiency of TSC-21 in the basic simulated flue gas atmosphere are 99.25% (MV) and 91.17% (SV), respectively. O, CO, and NO all promote the Hg removal by the adsorbent, but they benefit the Hg oxidation while inhibiting the Hg adsorption. The promoting effect of O on the Hg removal by TSC-21 is affected by the reaction time, which is especially obvious after 1 min. The presence of SO inhibits the oxidation and adsorption of Hg, which in turn reduces the Hg removal performance of the adsorbent. The improving effects on the oxidative escape of Hg by CO is higher than that by NO and O. TSC-21 acts more as an oxidant than an adsorbent for Hg removal.
在本研究中，从汞去除效率、汞吸附容量和汞质量平衡等方面，对燃煤烟气成分（O、CO、SO和NO）对具有前景的汞去除吸附剂机械化学S改性石油焦汞去除的影响进行了表征和分析。结果表明，基于在基础和全成分模拟烟气气氛（N + O + CO、N + O + CO + SO + NO）中的汞去除效率、汞去除容量和汞去除容量差异率（抗干扰能力），理论硫含量为21%的机械化学S改性石油焦（命名为TSC - 21）是汞去除的最佳候选吸附剂。TSC - 21在基础模拟烟气气氛中汞去除效率的最大值（MV）和稳定值（SV）分别为99.25%（MV）和91.17%（SV）。O、CO和NO均促进吸附剂对汞的去除，但它们有利于汞的氧化，同时抑制汞的吸附。O对TSC - 21汞去除的促进作用受反应时间影响，在1分钟后尤为明显。SO的存在抑制汞的氧化和吸附，进而降低吸附剂的汞去除性能。CO对汞氧化逸出的改善效果高于NO和O。TSC - 21在汞去除过程中更多地作为氧化剂而非吸附剂。
