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Power Plant Construction and QA/QC
Section 9.2 – Air Emission Controls
Engineering Technology Engineering Technology DivisionDivision
2
Section 9.2 – Air Emission Controls
Overview
• Air Quality Laws Required Cleaner Exhausts
• Clean Air Act - 1972
• Standards for Power Plant Air Pollution - 2011
• Precipitators Remove Fly Ash
• Chemical / Gas Conditioning
• Enhancements Continue to Remove Particulate
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Section 9.2 – Air Emission Controls
Electrostatic Precipitators
1. Ionize Gas
2. Charged Ions Attach to Ash
3. Ash Goes to Grounded Plates
4. Ash Falls to Collection Hoppers
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Section 9.2 – Air Emission Controls
Electrostatic Precipitators
• Electrical Cost
• Collection System
• Disposal Cost
Fly Ash Resistivity•Temperature•Chemistry•Ash Buildup
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Section 9.2 – Air Emission Controls
Flue-Gas Conditioning
Regulations
•Requirements
•Deadlines
Gas Chemistry
Costs
•Upgrade
•Condition
•New
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Section 9.2 – Air Emission Controls
Flue-Gas Conditioning – Sulfur Addition
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Section 9.2 – Air Emission Controls
Flue-Gas Conditioning – Ammonia Addition
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Section 9.2 – Air Emission Controls
Fluidized Bed Boilers
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Section 9.2 – Air Emission Controls
NOx Controls – Injection Burner
Efficiency and Ammonia Addition Reduce NOx
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Section 9.2 – Air Emission Controls
Flue Gas Treatment
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Questions?
Section 9.2 – Air Emission Controls