论文部分内容阅读
奥托昆普公司研制了一种脱除二氧化硫的新方法,此法不仅适用于贫烟气(含SO_20.1%～2%).并可改进以适用于富烟气(含SO_22%～15%).这种新方法叫还原硫法(SULFRED Process),其主要优点是:1)该法使用的试剂可再生:2)产出有价值的元素硫;3)二氧化硫含量和烟气量可容许波动;4)不产出废石膏。该法可分为四个主要阶段。第一阶段为吸收阶段,在此段中用OK洗涤器洗涤烟气,根据pH值控制范围(pH2.5～5)往洗涤液中加洗涤剂(硫化纳)。洗涤液主要含硫代硫酸纳、硫酸盐、连多硫酸盐和元素硫。它们全都是在吸收反应中生成的。少量排出的洗涤液进入高压釜阶段,在这个阶段中所有硫代硫酸盐和连多硫酸盐均分解成液体硫和硫酸盐溶液。然后在再生阶段添加足量硫化钡,使硫酸钠转化成硫化钠,并使硫酸盐呈硫酸钡沉淀:将硫酸钠溶液再生为硫化纳溶液,随后将硫酸钡沉淀物从硫化物溶液中滤出并在还原阶段加煤使之还原成硫化钡。用富的和贫的二氧化硫烟气对还原硫法做了半工业规模试验,本文介绍其中一些主要结果。
Outokumpu has developed a new method for the removal of sulfur dioxide, which is not only suitable for lean flue gas (containing SO_20.1% -2%), but also suitable for use in rich flue gas (SO_22% ~ 15 The new method, SULFRED Process, has the following main advantages: 1) Reagents used in the process are renewable: 2) valuable elemental sulfur is produced; 3) sulfur dioxide and flue gas are available Allow fluctuations; 4) do not produce waste gypsum. The law can be divided into four main stages. The first stage is the absorption stage, where the OK scrubber flue gas is scrubbed and the detergent (sodium sulphate) is added to the wash liquor according to the pH control range (pH 2.5 to 5). Washing liquid containing sodium thiosulfate, sulfate, polysulfate and elemental sulfur. They are all generated in the absorption reaction. A small amount of scrubbing liquid exits into the autoclave stage where all thiosulfate and polysulfate decompose into liquid sulfur and sulfate solutions. Then a sufficient amount of barium sulphide is added during the regeneration phase to convert the sodium sulphate to sodium sulphide and precipitate the sulphate to barium sulphate: the sodium sulphate solution is regenerated into a sodium sulphite solution, and the barium sulphate precipitate is subsequently filtered off from the sulphide solution And in the reduction stage to reduce coal into barium sulfide. Some of these major results are presented in this paper on a semi-industrial scale trial of reducing sulfur by using rich and poor sulfur dioxide fumes.