The effect of ash and filter media characteristics on particle filtration efficiency in fluidized bed

Collection of SiO2, Al2O3 and Fe2O3 particles using a gas-solid fluidized bed filter

“…In the authors' previous studies, a fluidized bed filter was used to collect the fly ash from a coal-fired boiler. SiO 2 , Al 2 O 3 and Fe 2 O 3 were major components of the fly ash [30]. Therefore, SiO 2 , Al 2 O 3 and Fe 2 O 3 particles were used herein to study the influence of the various parameters on the particle filtration.…”

“…Therefore, the filtration of the mixed SiO 2 , Al 2 O 3 and Fe 2 O 3 particles was examined. The mixing mass ratio of these particles (5:3:2) was determined for the specific SiO 2 , Al 2 O 3 and Fe 2 O 3 particle contents of the fly ash in the exhaust gas of a coal-fired power generation plant [30]. Fig.…”

Filtration of nano-particles by a gas–solid fluidized bed

“…The SiO 2 particles moved to the top of the bed and were elutriated to raise the exit concentration significantly. In an earlier work [16], the segregation of the binary mixture was proved to affect the filtration of particles of the incinerator fly ash. Al 2 O 3 does not exhibit this phenomenon violently perhaps because its density is higher or the adhesive force between Al 2 O 3 and Al 2 O 3 particles or Al 2 O 3 and A.C. particles is stronger than that with SiO 2 so the segregation is weaker.…”

“…In the authors' earlier works, the fluidized bed was used to remove acid gas, organic compounds and heavy metals [12][13][14]. A series studies also focused on the filtration of the fly ash of a coalfired power plant and a municipal solid waste incinerator by fluidized beds [15][16][17]. This paper, one of these serious studies, examined the feasibility of the filtration of 80 nm particles by fluidized beds.…”

Removals of fly ash and NO in a fluidized-bed reactor with CuO/activated carbon catalysts

“…The concentration of fly ash produced in thermal power plants ranges from 1000 to 10,000 mg m −3 and the mass medium diameter (MMD) locates at 4-40 m [1,2]. Previous studies have found that the compositions of fly ash are 43% SiO 2 , 22.5% Al 2 O 3 , 7.7% Fe 2 O 3 , and 7.5% CaO [2][3][4]. Conventional air pollution control devices (APCDs) used for removing acid gases and fly ash from the flue gas always comprise more than two apparatuses, such as an electrostatic precipitator integrated with a wet scrubber and an NO x converter (selective catalytic reduction with ammonia), or a semi-dry scrubber integrated with a bag filter and NO x converter [1][2][3].…”