【摘要】：在直徑0.3 m、總高7.2 m的沸騰床反應(yīng)器內(nèi)采用脈沖示蹤法研究液相的返混特性。實驗中分別以空氣和水作為氣相和液相,氣體操作速度從0.26 cm·s-1變至12.97 cm·s~(-1),液體表觀速度固定為0.86 cm·s~(-1)。采用三氧化二鋁顆粒作為固相,其中固體顆粒的平均粒徑為0.4 mm,床層固體含量(體積分數(shù))從0變至42.9%。實驗結(jié)果表明,在所有考察條件下每組響應(yīng)曲線均存在明顯的長拖尾現(xiàn)象,沸騰床內(nèi)存在劇烈的液體返混現(xiàn)象。嘗試采用帶回流的多釜串聯(lián)模型擬合實驗數(shù)據(jù),結(jié)果表明模型預(yù)測值與實驗數(shù)據(jù)吻合得非常好,其中擬合得到的全混釜個數(shù)N為8,回流比k從1.320至4.218不等,方差預(yù)測值與實驗值之間的最大誤差不超過+18%。
[Abstract]:In a fluidized bed reactor with a diameter of 0.3 m and a total height of 7.2 m, the backmixing characteristics of liquid phase were studied by pulse tracer method. Air and water were used as gas phase and liquid phase respectively. The operating rate of gas changed from 0.26 cm / s ~ (-1) to 12.97 cm s ~ (-1), and the apparent velocity of liquid was fixed to 0.86 cm / s ~ (-1). Aluminum trioxide particles were used as solid phase, in which the average diameter of solid particles was 0. 4 mm, bed solid content (volume fraction) changed from 0 to 42.9. The experimental results show that there is obvious long tail phenomenon in each group of response curves under all the investigation conditions, and there is a violent liquid backmixing phenomenon in the fluidized bed. The experimental data are fitted by a multi-vessel series model with a return flow. The results show that the predicted values of the model are in good agreement with the experimental data, in which the total number of mixers N is 8, and the reflux ratio k is from 1.320 to 4.218. The maximum error between the variance prediction value and the experimental value is not more than 18.
【作者單位】： 化學工程聯(lián)合國家重點實驗室華東理工大學化工學院;中國石化撫順石油化工研究院;
【基金】：國家自然科學基金項目(21306045,21676085,21076072) 中央高校基本科研業(yè)務(wù)費專項基金項目(222201314014)~~
【分類號】：TQ051.11

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