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Opory przepływu gazu przez wybrane złoża czynne używane w biofiltracji

Palica M.

Przemysł Chemiczny

2005

T. 84, nr 6

438-440

Podano współczynniki liczbowe A i C uogólnionej zależności na opory przepływu Eu = C ReA (H/H0) dla H0 = 0,45 m oraz wartości B0, ε , de i a dla spotykanych w praktyce złóż biofiltracyjnych, wyznaczone na podstawie badań w kolumnie o D = 0,175 m i wysokości czynnej złóż H0 = 0,45 m. Ponadto podano sposoby opracowywania wyników badań hydrauliki takich złóż.

Coeffs. A and C in the gas-phase pressure drop correlation, Eu = C·ReA(H/Ho), where Eu, Re are Euler and Reynolds nos., resp., and H = active bed height, were detd. in a column ø = 0.175 m and Ho = 0.45 m, or taken from 15 refs., for selected 25 off-gas biofiltering media including conifer and mixed-type deciduous tree barks, peats, straw, shavings, chips, common-mushroom (Agaricus campestris Fr.) spent subsoil, and composts beds. For each bed, the correlation was based on min. 30 exptl. data and bed permeability, bed porosity, hydraulic equiv. diam., and av. sp. bed resistance were specified. In 15 cases, the squared standard deviations were R2 = 0.91–0.99.

A Study of the Nonsteady-State Filtration Process in a Fibrous Material in Conditions of Real Dust Loading

Majchrzycka K.

International Journal of Occupational Safety and Ergonomics

2000

Zeszyt Specjalny

45--58

The study concerns ways to describe filtration efficiency and gas flow resistance while particles are deposited in fibrous respiratory protective filters under conditions characteristic for their use. The performance of fibrous filter materials of varied structure and electrostatic properties was studied, using polydisperse coarse-grained aerosols and submicron aerosols of sodium chloride. Evidence was found that changes in airflow resistance depended to a large extent on air humidity and the concentration of the aerosol. A relationship was also found between the electrostatic properties of filter media and their decreasing efficiency with time. A numerical model was developed to simulate the phenomenon of nonsteady-state filtration for 2 mechanisms of deposition, which permitted assessment of the filtration characteristics of filter media of any design and in any conditions.