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How to Control Emissions to The Atmosphere (Wan Mohamad Syameer bin Wan…
How to Control Emissions to The Atmosphere (Wan Mohamad Syameer bin Wan Suhaimi, 25247)
Factors for selection of equipment
- size distribution of particles
- particle loading
- gas throughput
- permissible pressure drop
- temperature
Gravity Settlers
- function purely on the basis of density difference and are used to collect coarse particles.
- Only particles in excess of 100 μm can reasonably
be removed.
Inertial Collector
- The particles are given a downward momentum to assist the settling.
- Only particles in excess of 50μm can be reasonably removed
Cyclones
- Particle-laden gas enters tangentially and spins downwards and inwards, ultimately leaving the top of the unit.
Scrubbers
- designed to contact a liquid with the particle-laden gas and entrain the particles with the liquid.
- can be used to remove gaseous as well as particulate pollutants.
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Bag Filters
- most common method of separating particulate materials from gases
- cloth or felt filter material is used, which is impervious to the particles.
- suitable for use in very high dust load conditions..
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Hierarchy appropriate for control of
VOC emissions
1) Eliminate or reduce VOC emissions at source.
2) Recover the VOC for reuse.
3) Recover the VOC for treatment and disposal.
4) Treatment and disposal of the VOC-laden gas stream.
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Methods for VOCs Recovery
- Condensation
- Membrane
- Ad/Absorption
Balancing Line
- The atmospheric storage tank in is fitted with a vacuum/pressure relief system to guard against overpressure or under pressure of the storage tank.
- As the atmospheric storage tank is emptied and the road tanker filled, the displaced vapor from the road tanker is pushed back into the atmospheric storage tank
- In this way, displaced vapor from the road tanker is
prevented from being released to the atmosphere
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