(1. 東北電力大學(xué) 能源與動(dòng)力工程學(xué)院，吉林 132012；
2. 中國大唐集團(tuán)科學(xué)技術(shù)研究院有限公司，北京 102206)
摘 要: 采用實(shí)驗(yàn)和理論分析方法，以Lacey混合指數(shù)作為混合評(píng)價(jià)指標(biāo)，研究轉(zhuǎn)速、填充率對(duì)橢圓型混合器內(nèi)二元顆粒在滾落運(yùn)動(dòng)模式下徑向混合的影響。結(jié)果表明：在波動(dòng)混合階段，橢圓型混合器的離心率影響顆粒的混合穩(wěn)定性；同一工況下，橢圓型混合器在豎直位置和水平位置的顆粒動(dòng)態(tài)休止角相等；填充率一定時(shí)，動(dòng)態(tài)休止角隨轉(zhuǎn)速的增大而增大；填充率不大于1/2、轉(zhuǎn)速一定時(shí)，同一位置的活動(dòng)層自由下滑面長度隨填充率的增大而增大；同一工況下，橢圓型混合器在豎直位置時(shí)的活動(dòng)層面積大于水平位置時(shí)；位置一定時(shí)，活動(dòng)層面積隨填充率增大而減小，隨轉(zhuǎn)速增大而增大；當(dāng)轉(zhuǎn)速不變，顆粒的混合程度隨填充率減小而提高。
關(guān)鍵字: 橢圓型混合器；二元顆粒；活動(dòng)層；徑向混合
（1. School of Energy Resource and Power Engineering, Northeast Dianli University, Jilin 132012, China;
2. Science and Technology Research Institute Co., Ltd., China Datang Corporation, Beijing 102206, China）
Abstract:In order to evaluate the quality of mixing, the effects of filling ratio and rotational speed on transverse mixing of binary granular in an elliptical mixer operated in the rolling regime were studied adopting experimental and theoretical approaches based on mixing index Lacey. The results indicate that the centrifugal rate of the elliptical mixer affects the mixing stability of binary granular in the wave mixing stage. For the same operating condition, the dynamic angle of repose in horizontal position and vertical position of the elliptical mixer are equal. When the filling ratio is constant, the dynamic angle of repose increases with the increase of rotational speed, however, the filling ratio is not larger than 1/2, the length of active layer with free surface increases with the increase of the filling ratio at the same rotational speed increasing. For the same operating condition, the area of the active layer in the vertical position is bigger than that in the horizontal position. The area of the active layer decreases with the filling ratio increasing, and increases with the rotational speed increasing in the same elliptical cylinder position. The mixing degree of granular increases with the decrease of filling ratio at a fixed rotational speed.
Key words: elliptical mixer; binary granular; active layer; transverse mixing
