| 摘要 |
<p>Recirculation cyclones for dedusting and dry gas cleaning - comprising a reverse-flow cyclone collector (a, b, H1, D1, h, Db, De1, s1) and a straight-through cyclone concentrator (De1, H2, D2; De2, s2, Dv), located in series and with recirculation - characterised by the collector being located upstream from the concentrator and by a recirculation line (Dv), that recirculates a fraction of the flue gases from the concentrator to the collector, by means of a fan, ejector or venturi. Dedusting and dry gas cleaning methods, characterised by making the flue gases pass through such a device. Utilisation of those methods and device to dedusting exhaust gases from diesel combustion or to dedusting and dry gas cleaning acid gases like HCl, HF, SO2 and/or NOx by an injection of a solid sorbent. The efficiency is always larger than that of a reverse flow cyclone alone, with the same geometry and size as the collector, and than that of recirculation systems with the concentrator upstream the collector, with comparable geometries and sizes.</p> |
