稻秸秆气化过程中碱金属K的迁移释放特性

Migration and release characteristics of alkali metal K during gasification of rice straw

中文关键词: 稻秸秆气化  碱金属K  迁移释放

英文关键词: rice straw gasification  alkali metal K  migration and release

中文摘要:

      生物质的广泛利用减缓了环境恶化, 但其较高的碱金属含量会导致气化过程中碱金属的析出, 从而引 起受热面高温腐蚀、 细颗粒排放污染, 研究碱金属的释放及赋存形态的转化有助于解决问题。 在小型流化床 上进行变工况气化实验, 将稻壳原样和气化飞灰进行化学分馏以测定各形态 K 元素的含量, 探究温度和气化 当量比对 K 元素的迁移释放的影响。 研究发现温度的升高和气化当量比的增加都会促使 K 元素的气相释放 比例增加, 水溶态的含量减少, 且温度对于 K 元素的迁移释放的影响比气化当量比更显著。

英文摘要:

      The extensive use of biomass slows down the environmental degradation, but its high alkali metal content will lead to the precipitation of alkali metals in the gasification process, resulting in high temperature corrosion of heating surface and emission pollution of fine particles. The study on the release of alkali metals and the transformation of occurrence forms will help to solve the above problems. In this paper, the gasification experiment was carried out in a small fluidized bed. The original rice husk and gasification fly ash were fractionated to determine the content of various forms of K element, and the effects of temperature and gasification equivalence ratio on the migration and release of K element were explored. It is found that the increase of temperature and the increase of gasification equivalence ratio can increase the gas phase release ratio of K element, and the content of water-soluble state will decrease, and the effect of temperature on the migration and release of K element is more significant than that of gasification equivalence ratio.