石油煉解與天然氣純化過程中，會產生許多硫化氫(H2S)廢氣，H2S 為一種毒性氣體，在0.01 ppm 低濃度下即可造成健康上之危害，因此，當製程尾氣排放H2S 時，將會造成環境及健康上之影響。本研究利用高週波(RF)電漿，在低壓環境下將硫化氫分解成氫氣及元素硫，並探討其回收之潛力。實驗結果顯示H2S 在較低濃度下(2500 ppm)，功率由5W 提高至40W時， H2S 分解率(ηH2S) 由90%增加至100%。H2S 濃度增加至5900 ppm 時，分解率明顯下降，功率5W 時，ηH2S 為72%，當功率提高至40W 時，ηH2S 則增加至86%。功率小於10W 時，濃度2500ppm H2S 中之硫轉化成元素硫之質量分率約為67%，而濃度5900 ppm H2S 中之硫轉化成元素硫之質量分率約為24%。當功率增加至10W 以上，H2S 分解率達到99%以上時，H2S 中之硫轉化成元素硫質量分率則達到85%。當H2S 進流濃度為5900 ppm，增加功率對H2S 分解率影響較小，因此元素硫質量分率變化較不明顯。 In process of petroleum pyrolysis and
natural gas purification, hydrogen sulfide
(H2S) will be one of the products. H2S is a
toxic gas. It can cause health risk even under
concentration of 0.01 ppm. As the offgas of
industrial process containing H2S, it will
endanger the environment and public health.
The objective of this study is to use the RF
plasma to decompose H2S into hydrogen and
elemental sulfur for recovery. Experimental
results indicated that ηH2S increased from
90% to 100% under 2500 ppm of H2S and
power increased from 5W to 40W. When
H2S concentration increased to 5900 ppm,
the ηH2S reduced to 72% and 86% at power
of 5W and 40W, respectively. As power
under 10W, the mass distribution of sulfur
from H2S to elemental sulfur was 67% and
24% for H2S concentration at 2500 ppm and
5900 ppm, respectively. As power higher
than 10W, the mass distribution of sulfur
from H2S to elemental sulfur increased
obviously to 85% at 2500 ppm. But it was
only slightly increased for H2S concentration
at 5900 ppm
