Power Plant Construction and QA/QC Section 9.2 – Air Emission Controls Engineering Technology Division

2 Section 9.2 – Air Emission Controls Overview Air Quality Laws Required Cleaner Exhausts Clean Air Act Standards for Power Plant Air Pollution Precipitators Remove Fly Ash Chemical / Gas Conditioning Enhancements Continue to Remove Particulate

3 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 + - +

4 Section 9.2 – Air Emission Controls Electrostatic Precipitators Electrical Cost Collection System Disposal Cost Fly Ash Resistivity Temperature Chemistry Ash Buildup

5 Section 9.2 – Air Emission Controls Flue-Gas Conditioning Regulations Requirements Deadlines Gas Chemistry Costs Upgrade Condition New

6 Section 9.2 – Air Emission Controls Flue-Gas Conditioning – Sulfur Addition

7 Section 9.2 – Air Emission Controls Flue-Gas Conditioning – Ammonia Addition

8 Section 9.2 – Air Emission Controls Fluidized Bed Boilers

9 Section 9.2 – Air Emission Controls NO x Controls – Injection Burner Efficiency and Ammonia Addition Reduce NO x

10 Section 9.2 – Air Emission Controls Flue Gas Treatment

11 Questions? Section 9.2 – Air Emission Controls