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在许多冶金过程中产生的低浓度二氧化硫烟气都有烟气成分变化不定、平均浓度低下(SO_2<3.5%)的特点。用传统的固定区氧化法处理这些烟气制硫酸,有以下一些大家熟知的困难:需要表面积很大的热交换器;预热烟气能耗大。由于这些使转化设备的投资与经营费用高昂、操作和管理困难。固定区氧化法的缺点还在于当烟气中的二氧化硫浓度下降到1.5%以下
Low-concentration sulfur dioxide flue gas generated in many metallurgical processes has the characteristics of variable flue gas composition and low average concentration (SO 2 <3.5%). There are several well-known difficulties with conventional fixed-zone oxidation processes for these flue-gas sulfuric acid systems: the need for a heat exchanger with a large surface area and the large energy consumption of the preheated flue gas. Due to the high investment and operating costs associated with these conversion facilities, operational and regulatory difficulties. The disadvantage of the fixed zone oxidation is that when the sulfur dioxide concentration in the flue gas drops below 1.5%