| 摘要 |
<p>A method for reducing mercury emission and/or re-emission in a cleaned flue gas through control of sulfite concentration within a wet flue gas desulfurization (WFGD) system is disclosed. One method for reducing mercury emission and/or re-emission through control of sulfite concentration is to measure the sulfite concentration of an aqueous alkaline slurry used in a WFGD system and comparing the same to a predetermined sulfite concentration value. If the comparison reveals the measured sulfite concentration is above the predetermined values, the amount of oxidation air supplied to the system is increased. If the comparison reveals the measured sulfite concentration is below the predetermined values, the amount of oxidation air supplied to the system is decreased. The method for reducing mercury emission or re-emission levels in a cleaned combustion flue gas comprises: supplying a combustion flue gas to a WFGD system for direct contact with an aqueous alkaline slurry for removal of contaminants from the flue gas to produce a cleaned flue gas; measuring a sulfite concentration using a sulfite sensor in the WFGD system for comparison to a predetermined sulfite concentration value; measuring mercury levels using a mercury measurement device in the WFGD system; and adjusting a WFGD system parameter to increase or decrease sulfite concentration to reduce levels of mercury emission and/or re-emission in the produced cleaned flue gas.</p> |
