Abstract: 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.

Key words: gas gathering structure; numerical simulation; fugitive emission; aluminum reduction cell; gas collection efficiency.