Dust Collection by a Fiber Bundle Electret Filter in an MVAC System

Figures & data

FIG. 1 The SEM plates of the test filters.

TABLE 1 Properties of the test filter media

Filter type	Specific weight (g/m^2)	Thickness (cm)	Mean fiber diameter (μ m)	Calculated packing density
PPF	107	0.1	26.3	0.085
FBF	5300	8.7	36.0	0.01
FF	345	1	32.4	0.023

FIG. 2 Size distribution of test dust and inflow particles to the filtration room.

FIG. 3 A schematic diagram of the experimental set-up for the particle loading test.

TABLE 2 Experimental conditions for the particle loading test

Test condition	Fly ash aerosol test
Filter size	Diameter-5 cm
Aerosol material	Fly ash
Aerosol filtration velocity	0.5, 1, 1.5, 2, 2.5 m/s
Test time	45, 60, 90, 105, 120 min
Aerosol particle size (mass median diameter)	10.05 μ
Aerosol concentration	350 ∼ 450 mg/m^3

FIG. 4 MVAC room with filtration system of N-station.

FIG. 5 The log probability of the fiber diameter.

FIG. 6 The pressure drop of the fresh filters with the face velocity.

FIG. 7 The dust filtration characteristics of the polypropylene filter (PPF).

FIG. 8 The dust filtration characteristics of the fiber bundle filter (FBF).

FIG. 9 The dust filtration characteristics of the fibrous filter (FF).

FIG. 10 The filter quality in terms of filtration velocity.

FIG. 11 The β_TL values with the flow velocity at mass loadings: (a) 0.3 kg/m² and (b) 0.9 kg/m².

FIG. 12 Fractional efficiency of the FF and FBF during the field operation.