污泥低温干化过程中硫的转化与分布
Sulfur transformation and distribution in the low temperature drying process for sludge
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摘要: 为研究污泥低温干化过程中的含硫气体释放和系统中硫的转化，以一条产线为例，检测讨论污泥干化全过程中硫含量、气体中含硫污染物浓度和气体冷凝水中硫化物浓度和分配情况。经测试发现，污泥低温干化过程中，干污泥中最终保留80%以上的硫元素并随着干污泥进入电厂煤棚，其余硫元素在干化过程中转化成气态、固态。检测发现，干燥过程中有硫化氢、甲硫醚、二硫化碳等气体逸出，并在工艺过程中发生归中反应，凝结出硫单质进入冷凝污水或附着在管道内壁上，硫单质为硫总量的12.5%；管道内壁上固体附着物质含硫量达到54%。研究结果为污泥低温干化过程提供元素硫的转化分布数据，对污泥干化系统设备维护保养、气体环保处置、含硫物质的回收处理具有积极意义。Abstract: In this study, the sulfur-containing gas release and sulfur transformation in the sludge low-temperature drying system were investigated. In a production line for sludge low-temperature drying process, the total sulfur content in sludge, and the concentration and distribution of sulfur-contained pollutants in gas and condensate water were tested. The results show that over 80% sulfur element remained in dried sludge during the drying process, finally transported to the power plant and mixed with coal for incineration, the rest of sulfur element transformed into gaseous or solid states. Some kinds of gas, such as hydrogen sulfide, methionine, carbon disulfide ect., could escape during the drying process, and the synproportionation reaction occurred accordingly. The condensed sulfur entered the sewage, or adhered to the pipeline inner wall which could account for 12.5% of the total sulfur. The attachment on the pipeline inner wall contained 54% sulfur. In this study, the sulfur element transformation and distribution have been provided for sludge low-temperature drying process, which is of great significance for sludge drying system equipment maintenance, gas environmental treatment and sulfur-contained substances recovery.
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Key words:
- sludge /
- low temperature drying /
- hydrogen sulfide /
- sulfur transformation
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