| 摘要 |
<p>of the Invention A sulfur bearing carbonaceous fuel, particularly a low BTU gaseous fuel, is burned in a deficiency of air in the combustion sons of a boiler to form a reducing gas containing H2 and CO in an amount in excess of that required to reduce the generated SOx to H2S and COS. The oxides of sulfur and nitrogen are, in part, converted to H2S, N2 and/or NH3 during heat transfer in the boiler. The balance is passed through a catalyst chamber where sulfur species are converted to H2S and oxides of nitrogen to N2 and/or NH3. The formed H2S is extracted from the flue gas prior to venting to the atmosphere and recovered as free sulfur. Catalytic conversion is carried out at a temperature from about 300.degree.F to 800.degree.F.</p> |
