合成气一步法制二甲醚的固定床有效导热系数

Effective Thermal Conductivity Coefficient of Fixed-Bed for Dimethyl Ether Direct Synthesis from Syngas

当温度为180~320℃时,采用稳态法测定出气体静止时分别装填甲醇合成、甲醇脱水及混合催化剂的固定床有效导热系数范围依次为0.238 0~0.286 0,0.206 0~0.286 2和0.209 2~0.275 3。将实验数据与前人提出的几个常用的固定床有效导热系数关联式的计算值进行了比较,其中Kunii关联式的计算值与实验值吻合程度最好,关联式的计算值与3组实验值的最大误差分别为4.96%,3.63%,3.60%,标准偏差分别为0.78%,0.62%,0.63%。该模型可用于计算气体静止时合成气一步法制二甲醚体系的固定床有效导热系数。

The ranges of effective thermal conductivity coefficients of stagnant fixed-bed,which packed with methanol synthesis catalyst,dehydration catalyst and mixed catalyst were measured as 0.238 0-（0.286 0,）（0.206 0）-0.286 2 and 0.209 2-0.275 3,respectively,using the steady state method from （180 °C） to（320 °C）.Compared the experimental results with the calculated data from some prediction formula,Kunii equation gave the best mathing results.The maximum deviation and standard deviation of the calculated value of the Kunii formula with three experimental results are 4.96%,3.63%,3.60% and 0.78%,（0.62%）,0.63%,respectively.It is concluded that the formula proposed by Kunii was suitable to calculate the effective thermal conductivity coefficient of fixed bed for dimethyl ether synthesis from syngas.