MAGNETIC FILTER Russian patent published in 1997 - IPC

FIELD: deep cleaning of high-temperature gases from ferromagnetic and nonmagnetic dust at low hydraulic pressures and high velocities accompanied by heat recovery. SUBSTANCE: filter has horizontal filtering chamber, elbow-shaped chamber being preferable, device for forming two-curtain falling flow of nonmagnetic spheres of similar size (1 to 2 mm) which consists of downslide adjustable fire grate with one stationary fire bar and two movable fire bars, acceleration chamber where magnetized filter material is accelerated in two-passage inclined duct by two gastight curtains intersecting the contaminated gas flow in chamber; cleaning the gas from diamagnetic and ferromagnetic dust is effected due to dynamic processes arising in flowing and due to attractive action of magnetized spheres. Process is rapid, it takes fractions of second. Falling flow enters curvilinear bell-mouth 25. During motion in bell-mouth in section where electric coil is located, flow of spheres is subjected to demagnetization under action of variable magnetic field after which it enters rotary motor which sets it in rotation; vibration exciter which causes vibration of sieve is set in rotation through step-up gearing. After flow has been cleaned from dust it rolls down over inclined branch pipe to diamagnetic pipe of linear induction motor-conveyer; under action of electromagnetic forces the flow gets magnetized and rises, then it returns to hopper through inclined branch pipe being cooled in tubular heat exchanger and then it is again admitted to fire grate. EFFECT: enhanced efficiency. 3 cl, 7 dwg