期刊
FUEL
卷 211, 期 -, 页码 621-628出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2017.09.083
关键词
Mercury emission and migration; Ammonia-based wet flue gas desulfurization; Air pollution control devices; Mercury re-emission
资金
- National Key R & D Program of China [2016YFB0600203]
- National Natural Science Foundation of China [51576044]
- Environment and Protection Project of Jiangsu Province [2016030]
Migration and emission characteristics of mercury in coal-fired power plant with an ammonia-based wet flue gas desulfurization (Am-based WFGD) process were studied based on the Ontario Hydro Method (OHM). The temperature-programmed desorption (TPD) method was used to identify the mercury species enrichment mechanisms in fly ash and the by-products of desulfurization. The SCR has a 95.41% mercury oxidation efficiency attributed to the high chlorine content in feed coal. SCR + ESP+ WFGD combination has 94.15% gaseous mercury removal efficiency. Mercury distribution analysis showed that most of incoming mercury was deposited in solid (76.46%), and only 4.94% gaseous mercury was emitted to atmosphere. The TPD results indicate that HgCl2 and HgO are the dominant mercury species in fly ash while mercury in WFGD products exists in HgCl2 form. The re-emission of mercury during ammonia desulfurization did not occur due to the presence of forced oxidation process, while mercury release from desulfurization product was monitored suggesting the mercury reemission from the ammonium sulfate separate and drying system could not be ignored. The mercury emission factor of the coal-fired power plant is calculated as 0.319 g/10(12) J, less than the mean value of Chinese power plant. With the equipment of Am-based WFGD, the mercury content in ammonium sulfate is 1.126 mg/kg, therefore the environmental influence from ammonium should be taken into account.
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