NEUI 600kA级铝电解槽烟气流场测试与研究

Testing and Research of Off-gas Flow Field of NEUI 600kA Level Aluminum Electrolytic Cell

为了提高电解槽的集气效率,减少烟气的无组织排放,对两台NEUI 600 kA电解槽内部的烟气流场进行测量。通过分析测试数据发现,在X方向上,两台电解槽槽罩板内烟气的温度分布均呈中间高、两边低的趋势,最高温度的点位不固定,出铝端烟气的温度高于烟气端;其中一台电解槽槽内的负压整体比较均衡,但个别位置的负压波动比较大,甚至有部分位置处于正压状态;另一台电解槽负压呈中间大、烟道端和出铝端较小的趋势。烟气温度和压力数据表明内部烟气流场与设计基本符合;电解槽出口的烟气量、负压值也与设计值基本吻合。

In order to improve the efficiency of off-gas collection of electrolytic cell and reduce the fugitive emission of off-gas, the off-gas flow field inside the two NEUI 600 kA electrolytic cells was measured. It was found by analyzing the testing data that in the direction of X, the off-gas temperature distribution inside the hood of the two cells had the tendency of being high in the middle and low on both sides, and the position of the highest temperature was not fixed;for all the two cells, the off-gas temperature was higher in the aluminum end than that in the off-gas end;the overall negative pressure inside one of the two cells was relatively uniform, but some specific positions had large negative pressure fluctuations, some positions were even in positive pressure status;the negative pressure of the other cell had the tendency of being large in the middle and being small in the off-gas duct end and the aluminum outlet end. The data of off-gas temperature and pressure showed that the internal off-gas flow field was basically in agreement with the design;the off-gas volume and negative pressure at the electrolytic cell outlet were also consistent with the design values.