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Flue Gas Desulphurization Systems

TRANSPARENT TECHNOLOGIES PRIVATE LIMITED

 
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Wet Flue Gas Desulphurization System

  • Limestone Process
  • Sodium Process
  • Ammonia Process
  • Seawater Process

Process Description of Limestone based Wet Flue Gas Desulphurization System

  • The incoming flue gas from boiler after ESP / Bag Filter is brought into contact with aqueous slurry of limestone in a scrubber tower.
  • Sulphur dioxide in the gas reacts with the slurry to form calcium sulphite which is oxidized in oxidation tank to produce Gypsum.
  • Gypsum is continuously removed from the oxidation tank in the form of slurry.
  • This slurry is passed through hydro cyclones followed by a filtration plant to separate gypsum flakes (10 -15 % moisture) and filtrate is recycled back to the process.

Features

  • Low Cost Limestone is used as sorbent
  • Commercial grade Gypsum is obtained as by-product
  • Most proven technology worldwide
  • Reasonable Operating cost
  • By-product (gypsum) is sellable
  • No disposal cost
  • High SO2 removal efficiency
  • Negligible liquid effluent discharge from the plant.
  • No solid waste is generated

Applications

  • Coal fired power plants
  • Large process boilers
  • Carbon black plants

Process Description of Sodium based Wet Flue Gas Desulphurization System

  • Flue gas rich in SO2 is brought in contact with an aqueous solution of NaOH / NA2CO3 in a tower
  • Sulphur dioxide reacts with of NaOH / NA2CO3 form Sodium Sulfite which is continuously removed from the bottom tank
  • Combined particulate and SO2 control is also possible

Features

  • Fully Automatic plant
  • High Removal efficiencies and tolerant of wide fluctuations in inlet SO2
  • Clear solution scrubbing minimizes scaling and plugging problems
  • The by-product can generate substantial revenue

Applications

  • Medium size power plants and process boilers

Process Description of Ammonia based Wet Flue Gas Desulphurization System

  • Working principle of the ammonia flue gas desulphurization process is similar to the limestone process except that aqueous ammonia is used as the scrubbing agent
  • SO2 is removed from the flue gas by reaction with ammonia, and the product is ammonium sulphate.

Features

  • Ammonia is used as sorbent and Ammonium sulfate is obtained as by-product
  • The high value of by-product Ammonium Sulphate gives attractive pay-back.
  • No effluent discharge plant is required.
  • Produces semi dry ammonium sulfate which is a fertilizer
  • High SO2 removal capabilities

Applications

  • Medium size power plants and process boilers

Process Description of Seawater based Wet Flue Gas Desulphurization System

  • Two basic seawater FGD process concepts
    • Most commonly used process using the natural alkalinity of the sea water to neutralize absorbed SO2
    • Addition of lime to seawater to neutralize absorbed SO2.

Features

  • Sea water is used as sorbent
  • No effluent discharge plant is required.

Applications

  • Plants in vicinity of sea with easily available sea water