铝电解槽集气结构的数值模拟研究

为了降低铝电解烟气的无组织排放，提高电解槽集气效率，采用数值模拟的手段对电解槽原集气结构中的内部流场分布情况进行模拟.以此为基础，研究了下烟道集气结构改造方案，并开发了新型上烟道集气结构.结果表明:原下烟道集气结构压力损失为363Pa，集气均匀性差，烟道积灰严重，集气效率低.下烟道集气结构改造简单，投资低，改造后可显著提高集气效率，但压力损失和积灰现象没有明显改善.新型上烟道集气结构改造较为复杂，投资较高，但改造后集气效率显著提高，同时压力损失显著降低至187Pa，烟道没有明显积灰.

Numerical Simulation Study on Gas Gathering Structure of Aluminum Reduction Cell

In order to reduce the gas fugitive emission and improve the gas collection efficiency of aluminum electrolysis cell， the flow distribution in the original gas gathering structure of the electrolysis cell was numerically simulated. Based on this， the improvement scheme of the lower gas gathering structure was studied and a new upper gas gathering structure was developed. The results show that the pressure drop of the original lower gas gathering structure is 363 Pa， the gas gathering uniformity is poor， the flue dust accumulation is serious， and the gas gathering efficiency is low. The lower gas gathering structure is simple to be reformed and the investment is low. After the reformation， the gas collection efficiency can be significantly improved， but the pressure loss and dust accumulation have no notable improvement. The new upper gas gathering structure reformation is more complicated and the investment is relatively high. However， after the reformation， not only the gas gathering efficiency is significantly improved， the pressure drop is also reduced dramatically to 187 Pa， and there is no obvious dust accumulation in the flue.