STACK GAS PURIFICATION

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STACK GAS PURIFICATION

• Adsorption, absorption, afterburning

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Stack draft

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Highest stack in the world
The GRES-2 Power Plant in Ekibastuz, Kazakhstan
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Solar chimney
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ADSORPTION

• Surface bonding effects remove unwanted gases

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Activated Carbon
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Sources of activated carbon
The physical form of the GAC may depend on
source of raw materials
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MANUFACTURE OF ACTIVATED CARBON DIFFERENT RAW
MATERIALS
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MANUFACTURE OF ACTIVATED CARBON
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ACTIVATION FURNACE TYPES
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DIFFERENT PHYSICAL FORMS OF ACTIVATED CARBON
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Scanning Electron Microscope Photo of GAC
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Area of a few grams of activated carbon
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Contacting Column Internals
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Granular Activated Carbon Columns
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GAC Silos
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Gas Purification
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Typical isotherm showing solid phase
concentration (y-axis) vs liquid phase
concentration (x-axis)
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Adsorptive Forces
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The effect of molecular size and functional
groups on adsorbability
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Freundlich isotherm
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Freundlich isotherm
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REACTIVATION OF ACTIVATED CARBON
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TRANSPORT OF ACTIVATED CARBON
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Some applications

• Publication and product gravure printing
• Package gravure printing, flexo printing
• Pressure sensitive/sticky tape and label
  production
• Magnetic tape production
• Coating and converting operations
• Chemical, petrochemical, pharmaceutical
  industries
• Electronic, photographic industries
• Textile, plastic manufacturing
• Paint spray booths (furniture, automotive,
  aerospace)
• Food, winery, tobacco, seed oil extraction
  processes
• Explosives manufacturing
• Dry cleaning, metal degreasing
• Soil remediation, ground water treatment
• Landfill and natural gas treatment
• Hazardous waste facilities
• All manufacturing process using organic solvents

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Vendors

• Calgon
• Durr Environmental
• Norit Americas, Inc.
• Thermatrix Inc.
• Munter

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ABSORPTION

• Dissolution of gases into a liquid
• Scrubbing for removal

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Adsorption versus Absorption
Surface collection rather than internal ?
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Venturi Scrubber
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Venturi scrubber
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Mechanically aided scrubbers
Centrifugal fan scrubber
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Packed tower
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Intalox saddles
Different packing materials
Tellerette
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Counter-current pray tower
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Cross-current spray tower
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Baffle spray scrubber
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Induced spray scrubber