Power Plant Construction and QA/QC

Section 9.2 – Air Emission Controls

Engineering Technology Engineering Technology DivisionDivision

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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