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Continuous Oral Solid Dose Processing
Published in Terry Jacobs, Andrew A. Signore, Good Design Practices for GMP Pharmaceutical Facilities, 2016
Dust collection is required to control the migration of dust. The continuous process is essentially closed, yet dust collection is still necessary. In the case of pneumatic transfers, there is a separation filter in the system, but not all of the air removed from the product is dust-free. Under normal running conditions, a dust collector is required to manage the dust within the equipment and create an appropriate pressure differential to contain the unwanted dust.
Sustainability Issues in Advanced Machining Processes
Published in V. K. Jain, Advanced Machining Science, 2023
Palivela Bhargav Chandan, Aluri Manoj, Kishor Kumar Gajrani, Shivansh Dhaka, Mamilla Ravi Sankar
This process tends to pollute the environment. A dust collector system to collect the dust from the abrasives must be supplied to avoid health hazards and air pollution, which can otherwise be inhaled by the operator and can cause various lung diseases as revealed in the study [30] (Figure 15.15).
Fabric Filter Collectors
Published in Kenneth Schifftner, Air Pollution Control Equipment Selection Guide, 2021
Basically, the best dust collector for the job will require the least overall cleaning energy and cleaning cycles to perform. It will operate at low pressure differential over the filters, holding fan energy down, and will provide long efficient filter life and infrequent service.
Vacuum cleaner as a source of abiotic and biological air pollution in buildings: a review
Published in Advances in Building Energy Research, 2022
Azad Bahrami, Fariborz Haghighat, Ali Bahloul
For a vacuum cleaner to efficiently meet a healthier environment, it needs to have the right filtration system. In fact, the filter is the heart of the cleaner, responsible for capturing contaminants and other particles in the air and keeping them contained for safe disposal or for recovery/recycling processes. Mostly the cleaners contain a series of systematic and arranged filters. In fact, a series of progressively finer filters are installed to capture increasingly smaller particles as the air passes through the system. There are three main types of primary dust collector: (1) mechanical filtration (dry collector or fibrous media) (2) cyclonic collector (dust removed by centrifugal motion) (3) wet collector (See Figure 1). From the principle of fibrous filter, we know that the efficiency is a function of aerosol characteristics (diameter of particles and density of particles), operating condition (airflow rate) and characteristics of the filter (diameter of fibres, packing density, filter thickness, etc.) (Abdolghader et al., 2018). The initial filtration efficiency (η) a function of the fibre structural and the total single fibre efficiency (EΣ) can be estimated as where αf is the packing density, EΣ is the total single fibre efficiency, L is the thickness and df the is fibre diameter. For mechanical filter the total single fibre efficiency is given as where ED, ER, EDR, EI are the diffusion efficiency, interception efficiency, efficiency due to interception of diffused particles and impaction (inertia) efficiency, respectively. As to diffusion, diffusivity is the main mechanism for capturing particles smaller than 100 nm. Peclet’s number (Pe) is a dimensionless characteristic parameter defined as (Hinds, 1999) where df is the fibre diameter, U is the displacement velocity of the particle. Interception efficiency, additionally, is a function of interception parameter (R = ). Interception is not velocity dependence; nonetheless, it is highly under influence of particle size and fibre diameter. Particles with larger diameter, higher face velocity and greater density possess higher inertia; hence, they can be captured by the impaction mechanism (particles whose diameters are bigger than 1 µm). This mechanism is a function of Stokes number, given as below: where ρp is the particle density, dp is the particle diameter, Cu is Cunningham’s correction factor and µ is the dynamic viscosity of the fluid.