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在5 kW鼓泡流化床实验装置上,以循环流化床燃煤灰渣、煤矸石灰渣作为床料,进行了麦秆成型燃料燃烧黏结特性研究。实验表明:900℃工况下,相对于石英砂床料,以上两种床料均能够有效地控制生物质流化床燃烧过程中的黏结现象。结合SEM-EDX分析结果与多相平衡反应计算分析,应用流化床燃煤炉渣、煤矸石灰渣为床料控制麦秆流化床燃烧黏结现象的机理相似。相对于石英砂,两种床料中均含有较高含量的硫元素、较高含量的铝元素,在麦秆燃烧过程中,床料中的铝元素、硫元素会与麦秆灰中高含量的钾元素形成高熔点的物质,有利于减轻麦秆流化床燃烧黏结现象;另外,黏结物中相对高含量的碱土金属元素使得黏结物的熔点提高,有利于控制麦秆流化床燃烧黏结现象。
In the 5 kW bubbling fluidized bed experiment device, the combustion characteristics of the straw-forming fuel were studied by using circulating fluidized bed coal ash and gangue ash as the bed material. Experiments show that the above two kinds of bed materials can effectively control the sticking phenomenon in the combustion process of biomass fluidized bed at 900 ℃ under the condition of quartz sand bed material. Combining with the results of SEM-EDX analysis and the calculation and analysis of the multi-phase equilibrium reaction, the mechanism of using fluidized bed coal-fired slag and coal gangue ash as bed material to control the fluidized bed combustion of wheat straw is similar. Compared with quartz sand, both bed materials contain higher content of sulfur and higher content of aluminum. During the process of straw burning, the contents of aluminum and sulfur in bed material are higher than those in wheat straw ash In addition, the relatively high content of alkaline earth metal elements in the binder makes the melting point of the binder increase, which is in favor of controlling the phenomenon of the fluidized bed combustion of wheat straw .