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SO₃ removal involves
using
dry desulfurization
systems with hydrated lime or alkaline solutions to absorb SO₃ and convert it to a solid product like calcium sulfate
. In flue gas,
mist eliminators
are used to capture fine sulfuric acid droplets formed when SO₃ reacts with atmospheric moisture, preventing corrosion and environmental damage. For industrial applications, processes like dry scrubbing with bag filters or electrostatic precipitators effectively capture SO₃ along with other acid gases from flue streams.
Technologies for SO₃ Removal
-
Dry Desulfurization
:
- Hydrated Lime (Ca(OH)₂): This is a common reagent used in dry desulfurization systems, particularly in circulating fluidized bed (CFB) processes. The lime absorbs SO₃ and forms solid calcium sulfite or sulfate, which is then collected in a bag filter.
- Reagent Injection Systems: These systems, often used with bag filters, inject reagents like hydrated lime or other alkaline solutions to react with SO₃ and other acid gases.
-
Mist Eliminators
:
- Electrostatic Precipitators (ESPs) : These are effective in capturing very fine droplets, including sulfuric acid mist formed from SO₃ reacting with water vapor in the air.
- Vane/Centrifugal Mist Eliminators: For higher mist loads or larger droplets, these more robust systems are used.
- Mesh Pads: These are used for capturing fine acid mist in scrubbing applications.
-
Dry Scrubbing
:
- Bag Filter Systems: In these systems, the SO₃ is reacted with a reagent, and the resulting solid product is captured by a bag filter.
- Venturi Reactors : Enhanced dry scrubbing systems combine a Venturi reactor with reagent injection and a bag filter to improve acid gas removal efficiency.
Applications
- Sulfuric Acid Plants : Scrubbers with high-efficiency mist eliminators are used to remove SO₃ from tail gases.
- Coal-Fired Power Plants : These facilities use dry scrubbing and mist eliminators to control SO₃ emissions, preventing equipment corrosion and environmental pollution.
- Other Industrial Processes: SO₃ removal technologies are applied to treat off-gases from various industries, such as aluminum production, to reduce harmful emissions.
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SO₃ Removal from Flue Gas by Using Na₂SO₃
fao/agris
https://agris.fao.org
› search › providers › records
fao/agris
https://agris.fao.org
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Decreasing temperature and increasing
SO₃
concentration increased the
SO₃
selectivity. Na₂SO₃ oxidation was also promoted by the increasing
SO₃
concentration.
What will happen if SO3 is removed from the system in ...
Quora
4 answers · 1 year ago
Quora
4 answers · 1 year ago
If SO3 is removed from the reaction system that is at equilibrium,
more SO2 will be converted to SO3
by reaction with O2.
SO₃ removal
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https://www.njweixian.com
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https://agris.fao.org
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fao/agris
https://agris.fao.org
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https://www.cranfos.com.br
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CRANFOS dry desulphurization system uses CFB technology for high-efficiency SO₂,
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https://patents.google.com
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The desulfurization process is effective in
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ScienceDirect.com
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https://www.sciencedirect.com
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