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Environmental Protection > Air Pollution Control > Flashcards

Air Pollution Control Flashcards

1
Q

Define Washout/ Scavenging

A

Pollutants are collected in rain or mist and then settle out with moisture

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2
Q

What law do Gravitational Separators use?

A

Stokes Law

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3
Q

How do gravitational separators work?

A

A separation mechanism that utilises gravity

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4
Q

How do cyclones work

A

Another seperation mechanism that utilises centrifugal force

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5
Q

What are cyclones used for ? (2 uses)

A

Dedusting and demisting
Uses a preseperator

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6
Q

How do you determine collection efficiency for cyclones?

A

From Lapple graph (d/d50)

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7
Q

How do compare and scale geometrically similar cyclones?

A

Using Stokes or Euler numbers

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8
Q

How do wet collectors/scrubbers work?

A

Removes particulates matter from gas streams through absorption

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9
Q

What impacts the cleaning efficiency of a wet collector?

A

The size of particulates

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10
Q

What is the operation principle for gravity spray towers?

A

Dirty gas enters through the bottom particulates capture onto liquid droplets by impaction and interception

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11
Q

What does gravity spray tower work best for?

A

Larger particles >10um

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12
Q

What is the operation principle for packed bed?

A

Dirty gas flows around collector particles coated by a liquid film

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13
Q

What is the operation principle of venturi?

A

Liquid droplets accelerate through low pressure venturi throat and capture particles by impaction

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14
Q

How do you determine venturi performance

A

Using Lapple graph

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15
Q

What are the applications for wet scrubbers

A

Treating hot, combustible streams

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16
Q

What is the operation principle for fabric filters?

A

Gas stream passes through woven or felted fabric that filters out particulate matter

17
Q

How does a ESP work?

A

Particles are ionised using electrons and then are collected on electrocharged collecting plates

18
Q

Write an expression for SO2 using a alkaline solvent

A

2NaOH + SO2=> Na2SO3 + H2O

19
Q

Name two control devices for gaseous contaminants ?

A

Condensation and Combustion

20
Q

How is smog formed?

A

Nitrogen Oxides and VOC in the air

21
Q

How do catalytic converters work? (3 reactions)

A

Oxidising CO reactions
Reducing NOx reactions
Reactions between pollutants and reactions between pollutants and O2

22
Q

How does a coalescer work?

A

Environmental Protection (1 decks)

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