Characteristics of the removal of mercury vapor in coal derived fuel gas over iron oxide sorbents
Characteristics of the removal of mercury vapor in coal derived fuel gas over iron oxide sorbents
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DOI：
10.1016/j.fuel.2005.01.020
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发表时间：
2006
期刊：
影响因子：
7.4
通讯作者：
Shengji Wu;Azhar Uddin;E. Sasaoka
中科院分区：
文献类型：
--
作者：
Shengji Wu;Azhar Uddin;E. Sasaoka
研究了用硫化氢和含铁脱硫剂脱汞的新方法的特点。以前，我们认为这种方法是基于汞和硫化氢在脱硫剂上反应生成HGS的。然而，其反应机理还不是很清楚。在本工作中，研究了汞的去除特性，以阐明反应机理。在实验室中，用自制的含氧化铁的吸附剂脱除模拟煤制燃气中汞蒸气，其组成为汞(4.8 ppb)、硫化氢(400ppm)、一氧化碳(30%)、氢气(20%)、水(8%)和氮气(平衡气)。结果表明：(1)H_2S的存在是脱除燃煤煤气中汞不可缺少的；(2)在60-100℃温度范围内，含铁的脱硫剂能有效地脱除汞；(3)H_2O的存在抑制了汞的脱除活性；(4)氧的存在可能对汞的脱除起着非常重要的作用；(5)加热时观察到单质硫的形成。
The characteristics of a novel method for Hg removal using H2S and sorbents containing iron oxide were studied. Previously, we have suggested that this method is based on the reaction of Hg and H2S over the sorbents to form HgS. However, the reaction mechanism is not well understood. In this work, the characteristics of the Hg removal were studied to clarify the reaction mechanism. In laboratory made sorbents containing iron oxide were used as the sorbent to remove mercury vapor from simulated coal derived fuel gases having a composition of Hg (4.8ppb), H2S (400ppm), CO (30%), H2(20%), H2O (8%), and N2(balance gas). The following results were obtained: (1) The presence of H2S was indispensable for the removal of Hg from coal derived fuel gas; (2) Hg was removed effectively by the sorbents containing iron oxide in the temperature range of 60–100°C; (3) The presence of H2O suppressed the Hg removal activity; (4) The presence of oxygen may play very important role in the Hg removal and; (5) Formation of elemental sulfur was observed upon heating of the used sample.