Mercury removal performance of brominated biomass activated carbon injection in simulated and coal-fired flue gas
Mercury removal performance of brominated biomass activated carbon injection in simulated and coal-fired flue gas
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溴化生物质活性炭喷射在模拟烟气和燃煤烟气中的脱汞性能
DOI：
10.1016/j.fuel.2020.119131
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发表时间：
2021-02
期刊：
影响因子：
7.4
通讯作者：
Xiaobing Gu
中科院分区：
文献类型：
--
作者：
Weimeng Zhao;Xinze Geng;Jincheng Lu;Yufeng Duan;Shuai Liu;Peng Hu;Yifan Xu;Yaji Huang;Jun Tao;Xiaobing Gu
溴化生物质活性炭具有高效的气态汞去除性能，已成为一种新型、经济高效、环境友好的活性炭替代吸附剂。本文分别在模拟烟气气流床实验系统、中试规模0.3 MWth循环流化床燃烧(CFBC)系统和工业规模75 t/h CFBC锅炉系统中研究了注入溴化稻壳活性炭(RHAC-Br)的脱汞行为。为了进行比较，还研究了溴化椰壳活性炭（CHAC-Br）和溴化煤基活性炭（CAC-Br）在模拟烟气和燃煤烟气中的脱汞性能。结合氮气吸附-脱附和X射线光电子能谱分析，对三种吸附剂在不同规模的实验中的脱汞特性进行了表征和分析。结果表明，在气流床实验系统中，注入量和初始汞浓度的增加促进了RHAC-Br的脱汞，最佳脱汞温度为120℃，三种吸附剂的Hg0脱除效率依次为：η(CAC-Br)>η(CHAC-Br)>η(RHAC-Br)。在中试规模0.3 MWth CFBC装置中进行的进一步研究表明，三种吸附剂在燃煤烟气中的注入温度和脱汞行为与模拟烟气中的情况有很大差异，这主要是由于Hg2+和Hgp比例较大。 RHAC-Br 的除汞性能与商用活性炭 (CAC-Br) 相当。在工业规模75吨/小时CFBC锅炉系统中进行的结果表明，RHAC-Br喷射与CAC-Br喷射一样有效，验证了溴化生物质活性炭可以作为溴化活性炭在大型燃煤锅炉系统应用中的有效替代吸附剂。
Brominated biomass activated carbon, with impactful gaseous mercury removal performance, has become a novel cost-effective and environment friendly alternative adsorbent for activated carbon. In this paper, the mercury removal behavior of brominated rice husk activated carbon (RHAC-Br) injecting was investigated in a simulated flue gas entrained-flow experimental system, a pilot-scale 0.3 MWth circulating fluidized bed combustion (CFBC) system, and an industrial-scale 75 t/h CFBC boiler system, respectively. For comparison, the mercury removal performance of brominated coconut husk activated carbon (CHAC-Br) and brominated coal-based activated carbon (CAC-Br) was also studied in simulated and coal-fired flue gas. Combined with the nitrogen adsorption-desorption and X-ray photoelectron spectroscopy analyses, the three sorbents were characterized and analyzed on their mercury removal features in different scale experiments. The results showed that in the entrained-flow experimental system, the increase of injection amount and initial mercury concentration promotes mercury removal of RHAC-Br, with the optimum removal temperature of 120 °C, and the following order for Hg0removal efficiency for the three sorbents: η(CAC-Br)> η(CHAC-Br)> η(RHAC-Br). Further investigation carried out in the pilot-scale 0.3 MWth CFBC facility indicated that both injection temperature and mercury removal behavior of the three sorbents in coal-fired flue gas are quite different from those in the simulated flue gas, mainly as a result of large proportion of Hg2+and Hgp. The mercury removal performance of RHAC-Br is comparable to that of a commercial activated carbon (CAC-Br). The outcome conducted in the industrial-scale 75 t/h CFBC boiler system demonstrated that the RHAC-Br injection is as efficient as CAC-Br injection, verifying that the brominated biomass activated carbon could be an effectively alternative adsorbent for the brominated activated carbon in the application for large-scale coal-fired boiler systems.
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