METHOD OF AIR FRACTIONATION OF DISPERSED MATERIALS AND PROCESS AIR CLEANING Russian patent published in 2014 - IPC B07B7/08 

FIELD: process engineering.

SUBSTANCE: invention relates to separation of dispersed materials by air structures by their physical and mechanical properties and to their cleaning and can be used in, for example, mining and processing, grain-processing and power production. Proposed method comprises feeding dispersed air flow via tangential pipes into converging helical chamber composed by inner surface of casing with controlled perforation made at its side surface, turns of helical surface and exhaust pipe outer surface. It includes transfer of said dispersed air flow through the zone of differentiated air separation of said dispersed materials. Process air is cleaned and discharged by controlled acceleration of air mid to extract the fractions formed by said helical chamber. Fractions are discharged via said perforation into sealed chamber while cleaned process air is discharged into exhaust pipe from downward to upward paths. Dispersed air flow is transferred through at least three zones of differentiated air separation of said dispersed materials, cleaning and discharging of process air by controlled acceleration of air mix with preliminary isolation of coarse fractions at upper zone. The latter is composed by helical chamber that allows the required rate of the flow through mid zone with isolation of mid fraction at mid zone. The latter is composed by helical diffuser-confuser chamber of mid sections below helical surface varied by variation of perforation zone shape and size to allow isolation of mid fraction and by adjustment of exhaust pipe lower end position for removal of cleaned air portion therein. Enriched air mix is turned in lower zone of controlled turnover of enriched mix for extraction of fine fraction via side and end surface of the casing and removal of cleaned air into exhaust pipe. The latter is composed by circular chamber of the casing with aligned helical surface controlled in shape, height and diameter.

EFFECT: higher efficiency of fractionation from 240 mcm to 0,1 mcm and cleaning of process air to 99,8%.

3 cl, 1 dwg