关键词: 烟道气, 汞, 吸附剂, 选择性催化还原, 除尘, 湿法脱硫, 协同

Abstract: Coal-fired power plants （CFPPs） are major contributors of atmospheric mercury emissions；however，mercury removal from coal combustion flue gas is not mature in China. This paper briefly introduced current research progresses of mercury removal from flue gas of CFPPs and provided statistics data on installed capacity of domestic air pollution control devices （APCDs） including de-NOx equipment，de-dust equipment and desulfurization equipment. APCDs have synergistic effects on flue gas mercury removal，but the results are unsatisfactory due to the restrictions of coal quality，operating conditions，etc. Considering experiment results and operating conditions in a domestic CFPP，the following solutions were suggested：①adding oxides，which can enhance the oxidation efficiency of flue gas mercury in selective catalytic reduction (SCR) reactor；②spraying powdery activated carbon in combination with bromines to strengthen synergistic removal effect of flue gas mercury in electrostatic precipitator (ESP)，which may mercury removal efficiency more than 90%；③precise control of the pH value of desulfurization slurry and regularly discharging desulfurization slurry to reduce re-release rate of mercury，which can stabilize synergistic mercury removal effect in wet flue gas desulfurization (FGD)；④adjusting and optimizing the boiler operating parameters to improve synergistic mercury removal capacity in APCDs system.

Key words: flue gas, mercury, adsorbents, selective catalytic reduction(SCR), de-dust, desulfurization(WFGD), synergy