Experiments of the effects of reaction atmosphere on the coal ash sintering temperature
-
摘要: 煤灰的烧结温度对流化床燃烧及气化炉的设计和运行有着很重要的作用。利用所建的压差法煤灰烧结温度测量装置，在分析了灰样放置方式对煤灰烧结温度测量影响的基础上，测量了不同反应气氛下不同煤灰的烧结温度，并获得了煤灰成分以及反应气氛对煤灰烧结特性的影响。结果表明，煤灰的酸碱比越大，其烧结温度越高，同时煤灰的含铁量增加将明显降低其烧结温度；还原性气氛下煤灰的烧结温度低于氧化性气氛下煤灰的烧结温度，而在H2气氛下，具有适当的Fe2O3、Na2O、SO3配比的煤灰容易产生低温共熔体Na2SFeS，使得H2气氛下的烧结温度低于CO气氛下的煤灰烧结温度； 典型流化床气化下煤灰的烧结温度介于CO气氛和H2气氛下煤灰烧结温度之间,并且更接近于CO气氛。Abstract: The understanding of sintering temperature of coal ash is of significance for the design and operation of fluidized bed combustion and gasification systems. So the ash sintering for different coal ash samples under different reaction atmospheres was studied by means of a coal ash sintering temperature measuring system based on the variation of the pressure-drop, and the effects of reaction atmosphere and ash composition on coal ash sintering behavior were discussed. The results show that the sintering temperature increases with the ratio of the acidic oxide to the basic oxide in coal ash, and an increment of iron in coal ash will decrease the sintering temperature obviously. The sintering temperature of coal ash under reducing reaction atmosphere is lower than that under oxidizing reaction atmosphere, and the sintering temperature under CO atmosphere is higher than that under H2 atmosphere because an eutectic substance of Na2S-FeS can be formed easily under H2 atmosphere for the coal ash including Fe2O3、Na2O and SO3. The coal ash sintering temperature under typical fluidized bed gasification atmosphere is between that under CO atmosphere and H2 atmosphere, which is closer to the sintering temperature under CO atmosphere.
-
点击查看大图
计量
- 文章访问数: 1972
- HTML全文浏览量: 20
- PDF下载量: 1227
- 被引次数: 0
下载:
