ABSTRACT

Sulfur dioxide (SO₂) and nitrogen oxides (NO_x) in flue gas are a hazardous atmospheric pollutant associated with coal combustion and non-ferrous metal production. Here we report that laboratory pilot unit for scrubbing of industrial flue gas containing 80 ± 2 ppm SO₂ followed by melt regeneration with either CO or natural gas, verified that only 1.5–2.0 ppm SO₂ remained in the flue gas. The tests with the semi-industrial scale unit (271.26 kg of the eutectic carbonate melt and flue gas containing 0.15% SO₂, 13 ppm NO, 52 ppm NO₂) were received. In all tests, sulfur extraction from flue gas to the carbonate melt was >90–95% and nitrogen oxides extraction from flue gas to the carbonate melt was 60%. Sulfur and nitrogen oxides extraction from carbonate–sulfate–nitrite melt during regeneration stage was >99%. Carbonate melt-based SO₂ scrubbing therefore represents a practical and economical method for limiting sulfur and NO_x emission to the atmosphere from both coal-firing power stations and non-ferrous metallurgical processing plants.

摘要

烟道气中的二氧化硫 (SO ₂ ) 和氮氧化物 (NO _x ) 是与燃煤和有色金属生产相关的有害大气污染物。_{在这里，我们报告了用于洗涤含有 80 ± 2 ppm SO 2}的工业烟气的实验室试验装置，然后用 CO 或天然气进行熔体再生，证实烟气中仅残留1.5-2.0 ppm SO _{2 。}半工业规模装置（271.26 kg 共晶碳酸盐熔体和含 0.15% SO ₂、13 ppm NO、52 ppm NO _{2的烟道气）的测试}) 收到。在所有测试中，从烟气到碳酸盐熔体的硫提取率 >90-95%，从烟气到碳酸盐熔体的氮氧化物提取率为 60%。在再生阶段从碳酸盐-硫酸盐-亚硝酸盐熔体中提取的硫和氮氧化物>99%。因此，基于碳酸盐熔体的 SO ₂洗涤代表了一种实用且经济的方法，用于限制燃煤发电站和有色冶金加工厂向大气排放的硫和 NO _{x 。}