CAJ | 학술논문

汽液固三相循环流化床蒸发器已应用到盐化、烧碱、中药和造纸等工业中,表现出良好的防除垢性能.文中研究了这种新型流化床蒸发器的防、除垢机理.首先揭示出汽液固三相流剪应力对延长污垢的诱导期起主要作用,并对汽液固三相流剪应力和三相流剪应力增长率进行了定量计算,分析其影响因素.其次从污垢附着和剥蚀的角度,考察了固体颗粒的除垢作用.根据理论分析指出三相流剪应力对污垢附着需要的时间和污垢剥蚀比率的影响,从而计算了剥蚀比例和剥蚀速率及其影响因素.
기액고삼상순배류화상증발기이응용도염화、소감、중약화조지등공업중,표현출량호적방제구성능.문중연구료저충신형류화상증발기적방、제구궤리.수선게시출기액고삼상류전응력대연장오구적유도기기주요작용,병대기액고삼상류전응력화삼상류전응력증장솔진행료정량계산,분석기영향인소.기차종오구부착화박식적각도,고찰료고체과립적제구작용.근거이론분석지출삼상류전응력대오구부착수요적시간화오구박식비솔적영향,종이계산료박식비례화박식속솔급기영향인소.
Vapor-liquid-solid three-phase circulating fluidized bed evaporator was applied in the evaporation of salt, sodium hydrate, Chinese traditional medicine, and paper-making effluent, showing excellent fouling prevention and cleanup. The mechanism of fouling prevention and cleanup in the novel circulating fluidized bed evaporator was investigated. At first, it revealed that the three-phase flow shearing stress played a primary role in extending the induction period of fouling. The three-phase flow shearing stress and its growth rate were calculated, and its influencing factors were analyzed. Secondly, the role of fouling cleaning induced by particles was discussed from the viewpoint of fouling adhesion and denudation. Finally, the influence of three-phase flow shearing stress on adhesion time and denudation rate was presented based on theoretical analysis. The denudation rate and speed were calculated. The above research provides not only some theoretical foundation, but also certain guides or references for the operation of vapor-liquid-solid three-phase circulating fluidized bed evaporators.