Journal
APPLIED CATALYSIS A-GENERAL
Volume 650, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2022.118962
Keywords
Mercury emission; SCR catalyst; Catalyst breakage; Mercury oxidation; Combustion byproduct
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Field testing at a 300 MW coal-fired power station showed that selective catalytic reduction (SCR) can effectively reduce mercury content in flue gas. Commercial testing demonstrated that SCR catalyst breakage resulted in an increase in total mercury concentration at the electrostatic precipitator (ESP) inlet and outlet. Laboratory experiments confirmed the Hg0 oxidation capability of the commercial SCR catalyst.
Field testing toward mercury emission properties was conducted at a 300 MW coal-fired power station. Selective catalytic reduction (SCR) was found to reduce Hg content in flue gas significantly through catalyst breakage during the commercial testing in a 300 MW coal-fired power station. Field testing results indicate that the total mercury concentration in flue gas at electrostatic precipitator (ESP) inlet and ESP outlet increase due to SCR catalyst breakage. Correspondingly, mercury content in fly ash decrease and mercury content in gypsum increase. The evolution in laboratory confirmed the Hg0 oxidation capability of commercial SCR catalyst. Catalyst breakage leads to space velocity increasing, so that the lower Hg0 oxidation rates caused the mercury transformation change in flue gas and solid byproducts.
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