摘要
为实现1,3-丙二胺系列精细化工产品的连续化生产,研发一种气升式内环流浆态床,从实验和数值模拟计算两个方面对设备内部流体动力学特性开展研究。实验结果表明,表观气速由0.007增至0.028 m/s,4种固含率工况下,气含率均呈线性增加,增大固相浓度会降低同等操作条件下升液管的气含率,并增大流型转变气速。压力对气含率和流型转变气速影响较小,因压力引起的气泡特性变化是产生差异的主要原因。采用三欧拉法及RNG k-ε湍流模型建立环流浆态床的数值模型,模型计算结果与实验数据吻合较好,最大气含率偏差8.9%,流型转变气速偏差5.0%。模拟结果表明,在表观气速0.007~0.028 m/s范围内,增大固相浓度会降低同等操作条件下降液管中液相循环速率,压力对液相循环速率的影响很小。
In order to realize the continuous production of 1,3-malondiamine series fine chemical products,a kind of internal loop air-lift slurry reactor was designed.The experimental results showed that when the superficial gas velocity increased from 0.007 to 0.028 m/s,the gas hold-up increased linearly under four solid hold-up conditions.The increase of solid phase concentration decreased gas hold-up of riser,while increased gas velocity of regime transition under the same operating conditions.Pressure had little influence on gas hold-up and gas velocity of regime transition.The variation of bubble characteristics caused by pressure was the main reason for the difference.Three-Euler method and RNG k-εturbulence model were used to establish the numerical model of the circulating slurry reactor.The model fitted the measured data well with a maximum gas hold-up deviation 8.9%,gas velocity of regime transition deviation 5.0%.The simulation results showed that in the range of 0.007-0.028 m/s,increasing solid hold-up would decrease the liquid circulating velocity in the same operating conditions,while pressure had little influence on it.
作者
薄紫一
夏良志
王浩南
董瑞庭
BO Ziyi;XIA Liangzhi;WANG Haonan;DONG Ruiting(Department of Chemical Machinery&Safety,Institute of Chemical Technology,Dalian University of Technology,Dalian 116024,China)
出处
《化学反应工程与工艺》
CAS
北大核心
2020年第2期136-146,共11页
Chemical Reaction Engineering and Technology
关键词
气升式环流反应器
浆态床
1
3-丙二胺
三欧拉法
流动特性
air-lift loop reactor
slurry bed
1,3-diaminopropane
three-Euler method
flow characteristic