燃煤电厂碱性吸附剂脱汞性能研究

燃煤电厂汞污染已受到广泛关注。目前燃煤电厂最成熟的脱汞技术是活性炭喷射技术，但活性炭需要进一步改性且应用成本较高，因此，各类吸附剂脱汞研究已成为国内外研究的热点问题。依托大唐阳城电厂7号机组碱性吸附剂脱除系统，利用安大略湿化学取样方法（OHM）对NaHCO₃干粉的汞脱除效果进行试验研究。结果表明，在SCR的反应温度下NaHCO₃能够将大部分Hg⁰和少量Hg²⁺转化为Hg^P，且当NaHCO₃喷射量为480 kg/h时，Hg^P转化率已接近最大。所做研究为燃煤烟气脱汞提供了一条切实可行的技术路线。

Study on Mercury Removal Performance of Alkali Adsorbent in Coal-Fired Power Plant

Mercury pollution in coal-fired power plants has received widespread attention. At present, being the most mature technology, the activated carbon injection technology has been implemented for mercury removal in coal-fired power plants. However, activated carbon needs to be further transformed which is accompanied with its relatively high application cost. Therefore, the mercury removal with various types of adsorbent has become a hot research topic both domestically and abroad. In this article, based on the alkaline adsorbent removal system of Unit 7 of Datang Yangcheng Power Plant, the mercury removal effect of dry NaHCO₃ powder is tested and explored using Ontario Hydro Method (OHM). The results show that at the reaction temperature of SCR, NaHCO₃ can convert most of Hg⁰ and a small amount of Hg²⁺ into Hg^P. Furthermore, the Hg^P conversion rate is close to maximum when the injection volume of NaHCO₃ reaches 480 kg/h. This study provides a practical and feasible technical route for mercury removal from coal-fired flue gas.