摘要
提出一种无废烟气脱硫新方法。用硫化钠溶液洗脱工业烟气中二氧化硫，同时生成硫化氢。后者用Ｃｌａｕｓ反应可制取元素硫。反应过程为三阶段模式。第一阶段发生二氧化硫溶解和硫离子向硫氢根离子转变；第二阶段主要发生硫氢根离子向硫化氢转变同时吸收二氧化硫；第三阶段，溶液逐渐失去脱除ＳＯ２的能力。提高硫化钠初始浓度和反应温度或降低进气中二氧化硫含量，于提高Ｈ２Ｓ转化率有利。进气中二氧化硫分压增大，各阶段周期缩短。
This paper proposes a new process of sulfur dioxide removal from flue gases without producing solid waste.In such a process,sulfur dioxide is absorbal and hydrogen sulfide is evolved simultaneously.Consequently,elemental sulfur is supposed to be produced by the Claus reacton.A three stage model for the reaction system was observed in terms of the profiles of changes of pH value in the spent solution and composition of hydrogen sulfide in exit gas with the reaction time.In the first stage,sulfur dioxide was dissolved into solution and sulfide was converted into bisulfide;the stage Ⅱ was prominently conversion of bisulfide into hydrogen sulfide with simultaneous absorption of sulfur dioxide;the stage Ⅲ came about as a sign of sulfur dioxide in exit gas was detected.It has also been found that temperature and initial sodium sulfide in solution positively effected on the conversion rate of sodium sulfide to hydrogen sulfide.On the other hand,with an increase of sulfur dioxide content in the feeding gas,the duration of both stage Ⅰ and Ⅱ became shorter so that the system entered the second and third stages earlier.
关键词
硫化钠
硫化氢
工业烟气
脱硫
sodium sulfide
hydrogen sulfide
sulfur removal without producing solid wastes
