期刊
FUEL
卷 285, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2020.119131
关键词
Brominated biomass activated carbon; Sorbent injection; Mercury removal; Simulated flue gas; Coal-fired flue gas
资金
- National Key R&D Program of China [2016YFB0600604]
- National Natural Science Foundation of China [51876039]
The study demonstrated that brominated biomass activated carbon is an effective alternative adsorbent with good mercury removal performance in different scale experiments.
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 coalbased 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 degrees C, and the following order for Hg-0 removal efficiency for the three sorbents: eta(CAC-Br) > eta(CHAC-Br) > eta(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 Hg-p. 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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