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22 Cards in this Set
- Front
- Back
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Baghouses
Tubular fabric filters in a housing. Cleaning mechanism? |
filtration- shaking and reverse blowing
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potential baghouse problems?
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corrosion and efficiency
plugging or caking temperature restrictions depending on filter material. |
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one of the most trouble-free collection devices?
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Baghouse
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What is the particle size captured by baghouse filters?
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>0.25 microns
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What is the cleaning mechanism for cyclones ?
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centrifugal forces
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What is the particle size captured by cylcones ?
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particle size > 10 microns
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Electrostatic precipitators: Three collection steps?
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particle charging
particle collection dust removal |
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Electrostatic precipitators have _ pressure drop?
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low pressure drop
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Electrostatic precipitators can withstand high temperatures and can colect particles > _ microns
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particle sizes >0.25 microns
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Settling Chamber
_ flow _ flow _ efficiency Used for chip type material. |
oldest method of mechanical collection.
low flow uniform flow low efficiency chip type material |
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What is the cleaning mechanism for a scrubber?
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inertial impingement.
Contact particulates with water or another liquid and then collect the droplets. |
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Scrubber used for capturing particles of what size?
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>5 micron
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What is the cleaning mechanism for a venturi scrubber?
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inertial impingment and centrigugal force.
Liquid is introduced perpendicular to a carrier gas. |
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Venturi scrubber used for capturing particles of what size?
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>1 micron.
High power input required and severe maintenance problems. High energy costs. |
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Adsorber
Vapors and gases adsorbed on surface of? Does not work for? |
porous medium. e.g. activated charcoal.
Does not work at high temperatures. |
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Absorbers
Gases counter to flow of liquid and ? liquid must be ? |
absorbed into liquid.
good solvent for gases and vapors. |
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Absorbers are similar to ?
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scubber
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Condensor is similar to ?
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air conditioner.
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What type of particle collector should be selected for nonsticky particles larger than 5 microns?
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cyclone.
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Collection Efficiency equals?
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Environmental lapse rate
what is the average? |
temperature change rate in elevation.
Avg/ -0.65C/100 meters |
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Adiabatic rate:
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temperature change rate in elevation with no heat exchange for dry air.
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