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在750～950℃温度下,通过床层压差和床层温度的分析,分别对小麦秸秆压缩成型颗粒在鼓泡流化床和循环流化床实验装置上的黏结失流特性进行了分析。在鼓泡流化床燃烧中,黏结失流伴随着床层压差的突然下降和床层温度的迅速上升;不同床料,黏结失流现象类似,但床层压差下降速率和床层温度上升速率不同;在循环流态化燃烧中,当黏结失流现象发生时,密相区和稀相区压差同时突然降到零,同时炉膛温度迅速升高,炉膛出口和返料器温度急剧降低。鼓泡流态化和循环流态化下黏结失流的本质是床料颗粒之间的黏结导致流化失败,区别在于前者初始床料黏结失流发生在床内,后者初始床料黏结失流发生在分离器锥段和返料腿。实验表明:床层压差和温度变化能够作为判断生物质流态化燃烧黏结失流现象的依据。
Through the analysis of the bed pressure difference and the bed temperature at 750 ~ 950 ℃, the characteristics of the adhesive lagging of wheat straw compacted granules on the bubbling fluidized bed and the circulating fluidized bed experiment device were analyzed respectively. In the bubbling fluidized bed combustion, the loss of cohesion was accompanied by the sudden drop of bed differential pressure and the rapid increase of bed temperature. The bed materials and the phenomenon of bond loss were similar, but the rate of bed pressure drop and bed temperature In the circulating fluidized combustion, when the pressure loss occurs in the dense phase zone and the dilute phase zone, the pressure drop in the dense phase zone and the dilute phase zone suddenly drops to zero at the same time, the temperature in the furnace rises rapidly and the temperature at the furnace outlet and the ejector rapidly increases reduce. Bubble fluidization and circulating fluidization under the nature of the bond between the flow of bed material particles of the bond between the fluidization failure, the difference is that the former initial bed material loss occurred in the bond bed, the latter the initial bed material loss of bond The flow occurs in the separator cone and the return leg. The experiment shows that the bed pressure difference and the temperature change can be used as the basis to judge the phenomenon of the cementous fluidized burning and biomass loss in biomass.