The invention discloses double-sleeve fine-selection
cyclone separation equipment which comprises a spiral air inlet
pipe (1), an air inlet (2), a cone (3), an ash hopper (4), an air outlet (5), an overflow cylinder (7), an inner cylinder (8) and an upturning cylinder (9), a double-layer sleeve structure and an auxiliary outlet
airflow adjusting mechanism are arranged, and opening degrees of a top bypass
pipe and a drainage fan are combined to adjust air distribution, guide a spiral
airflow lengthening path in equipment, balance and make up working conditions of an
airflow return area, control pressure drop change in the equipment, prolong and stabilize a
cyclone separation process, realize
cyclone multi-link continuous separation and improve the separation efficiency. A
rotational flow cover-synchronous
impeller connecting shaft mechanism arranged on
rotational flow turn-back fulcrums at the lower ends of the inner cylinder and the outer cylinder can automatically clean local accumulated dust, greatly inhibit backmixing, reduce longitudinal circulation of an annular space, regulate or overcome short-circuit flow at a lower opening of an
exhaust pipe, maintain stable and coaxial inner and outer
rotational flow centers and the geometric center of equipment, and improve the air exhaust efficiency. Secondary vortex is effectively avoided or eliminated, and the separation efficiency of micron and submicron dust can be greatly improved.