摘要
研究了383mm的浅层鼓泡塔内高径比(H/DT)、气体分布器、固体浓度(Cs)对气含率和临界悬浮气速(Ugc)的影响.结果表明,当H/DT<1.5时,随H/DT增大,气含率增大,而Ugc明显下降;当H/DT>1.5时,气含率减小,Ugc变化不大,优化的H/DT约为1.5.采用四管管式气体分布器,当环径比(d/DT)为0.4时,Ugc最小.气含率随Cs增大而减小,Cs超过15%(φ)时,Ugc随Cs变化不大.最后,推导得到Ugc的经验关联式,可为工业反应器提供一定指导.
The influences of aspect ratio（H/DT） ,gas sparger and solid concentration（Cs） on gas holdup and critical gas velocity of solid suspension（Ugc） were investigated in a 383 mm i.d. three-phase shallow bubble column. The results show that when H/DT is smaller than 1.5,gas holdup increases and Ugc decreases with the increase of H/DT. However,when H/DT is larger than 1.5,the effect of H/DT on Ugc is insignificant. Gas sparger has great effect on Ugc,when d/DT is equal to 0.4,the value of Ugc is minimum. Gas holdup decreases with the increase of Cs. The effect of Cs on Ugc is insignificant,when Cs is larger than 15%（φ） . Finally,the empirical correlation is proposed to describe their quantitative effects on Ugc to give some physical insights into the experimental phenomenon.
出处
《过程工程学报》
CAS
CSCD
北大核心
2011年第6期901-906,共6页
The Chinese Journal of Process Engineering
关键词
浅层鼓泡塔
临界悬浮气速
气含率
高径比
气体分布器
shallow bubble column
critical suspension gas velocity
gas holdup
aspect ratio
gas sparger
