The invention relates to a self-circulation
flue gas dust collecting device and a method. A porous
impeller structure is applied to a dust collecting device cavity, a cleaning fluid acts with
potential energy to flow from top to bottom so as to drive a dust collecting
impeller to rotate
clockwise, no additional action is needed, and a self-circulation function of the device is realized; an
impeller rotation process also has a certain promotion function on feeding
flue gas; with the novel porous impeller structure,
pollutant particles in the
flue gas can be adsorbed and washed separately, so that the dust collecting efficiency is greatly improved; meanwhile, the dust collecting impeller is made of heat insulation materials, the
tail end of the impeller is tightly connected with the shell, and the contraflow of the
flue gas and the cleaning fluid is utilized for driving the dust collecting impeller to rotate
clockwise, so that the
flue gas is prevented from directing contacting the cleaning fluid, the loss of
flue gas waste heat during a dust collecting process is avoided, meanwhile, the dust collecting process is prevented from obstructing the flowing of the flue gas, and the
power consumption in the dust collecting process is reduced to a greater extent. The whole device has the characteristics of high dust collecting efficiency, low manufacturing and
operating cost, wide application temperature range, and the like.