两侧及轴向进料同向流水平撞击流反应器研究

Study on the Same Direction Flow Horizontal Impinging Stream Reactor with Feeds from Axis and Both Sides

以空气-水,空气-CMC(羧甲基纤维素)水溶液为体系,采用脉冲示踪和稳态微压差法测量了相关数据,研究了两侧及轴向进料同向流水平撞击流管式反应器中表观液速UL、气体喷出速度Ug、及液体粘度m在撞击流和非撞击流下对器内平均气含率eg的影响。得到了当气体喷速为170m·s-1,管内表观液速为0.6m·s-1时,气含率eg较大, 液相分散显著,使气液接触面增大的结果。实验测得了UL、Ug、液体的粘度 m 及撞击混合前后的压差Δh和混合时间t;将其关联后提出了在上述条件下该水平撞击流管式反应器平均气含率eg的关联式: 74.1573.0g56.1Lg1058.0-=meUU 以湿法磷酸(含P2O5 22%)-氨体系进行热态试验,结果表明:气氨喷速为170m·s-1、且磷酸进料流速为3.3m·s-1,管内物料表观流速为0.6m·s-1时,反应器内氨负荷较大、混合情况好、反应较彻底,而且氨逸出率最低。

The effect of superficial liquid velocity UL, gas spraying velocity Ug and liquid viscosityu m on gas hold-up for water-air system in an impinging stream reactor was investigated. The experimental data has been measured by using the pulse tracing and micro-differential pressure method. Under the conditions with or without impinging stream, the results indicated that the gas hold-up eg will be the highest when gas spraying velociyy is 170ms-1 and liquid superficial velocity is 0.6 m s-1. The liquid was well dispersed, the contact surfece area was increased. According to the experimental data of UL, Ug, Δh and mixing time the equation of gas hold-up eg of the horizontal impinging stream pipe reactor was correlated as following: 74.1573.0g56.1L1058.0-=meUUg The experiments with wet phosphoric acid and ammonia as feeding streams was carried out. The results showed that when Ug=170ms-1, UP=3.3 ms-1, UL =0.6 ms-1, the ammonia load in the reactor was the highest and its efficiency was optimal.