Increases in NO x Emissions in Coal-Fired, SCR-Equipped Electric Generating Units T. F. McNevin, Ph.D. Division of Air Quality New Jersey Department of.

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Presentation transcript:

Increases in NO x Emissions in Coal-Fired, SCR-Equipped Electric Generating Units T. F. McNevin, Ph.D. Division of Air Quality New Jersey Department of Environmental Protection NJ Clean Air Council Princeton South Corporate Centre Ewing, NJ January 14,

Increases in NO x Emissions in Coal-Fired, SCR-Equipped Electric Generating Units Clean Air Act Amendments (1990) – NO x RACT – OTC NO x Budget Program (1999) Northeast, Mid-Atlantic States – “NO x SIP Call” NO x Budget Program ( ) 20 Eastern States – CAIR (2009) – CSAPR (2012…..) 2

Increases in NO x Emissions in Coal-Fired, SCR-Equipped Electric Generating Units Clean Air Act Amendments (1990) – NO x RACT – OTC NO x Budget Program (1999) Northeast, Mid-Atlantic States – “NO x SIP Call” NO x Budget Program ( ) 20 Eastern States – CAIR (2009) – CSAPR (2012…..) 3

Increases in NO x Emissions in Coal-Fired, SCR-Equipped Electric Generating Units Clean Air Act Amendments (1990) – NO x RACT – OTC NO x Budget Program (1999) Northeast, Mid-Atlantic States – “NO x SIP Call” NO x Budget Program ( ) 20 Eastern States – CAIR (2009) – CSAPR (2015…..) 4

What has been Happening? 5

6

7

What is NO x ? Oxides of Nitrogen N 2 + O 2 --> NO, NO 2 8

What is NO x ? Oxides of Nitrogen N 2 + O 2 --> NO, NO 2 9

Why is NO x a Concern? 10

What has been Happening? Hundreds of coal-fired EGUs have installed SCR 11

Selective Catalytic Reduction (SCR) NO x + NH 3  catalyst  N 2 + H 2 O TiO 2, V 2 O 5, WO 3, Pt, Pd, zeolites 350° - ~1,100 °F > 90% reduction 12

13 Coal-Fired EGUs in Eastern US

OTC Modeling Domain 14

CAIR States 15

CSAPR States 16

17

Eastern Half of US 18 CSAPR CAIR OTC Domain

2014 Ozone Season Excess NO x in Top 25 Emitters OTC Domain 37,750 tons CAIR States 36,626 tons CSAPR States 32,403 tons 19

What has been Happening? Hundreds of coal boilers have installed SCR Emission rates fell dramatically

Ozone Season NO x Emission Rates of SCR-Equipped Coal-Fired EGUs in Eastern US with Number of Units. 21

What has been Happening? Hundred of coal boilers have installed SCR Emission rates fell dramatically Emission Rates began increasing after

Ozone Season NO x Emission Rates of SCR-Equipped Coal-Fired EGUs in Eastern US with Number of Units. 23

2013 Ozone Season Top 200 Boilers = 66% of NO x – 198 Coal-fired EGUs – 79 SCR Equipped Best Observed Rate (BOR), lb/mmBTU – ≈68%, 2013 Emission Rate > BOR – Ratio (79 Units): 1.0 – 9.2, Mean =

Ozone Season NO x Emission Rates of Coal-Fired Units in OTC Modeling Domain with Reduced SCR Operations within the 2013 Top 200 Emitters. 25

Ozone Season NO x Emission Rates of Coal-Fired Units in OTC Modeling Domain with Reduced SCR Operations within the 2013 Top 200 Emitters. 26

What Happened? Collapse of CAIR allowance costs – $4,600/ton January 2009, $51/ton October 2012 Oversupply of allowances Market uncertainty – Less than forecast electric demand 27

Total US Annual Electrical Generation. 28

What Happened? Collapse of allowance costs – $4,600/ton January 2009, $51/ton October 2012 Oversupply of allowances Market uncertainty Less than forecast electric demand – Top 200 NO x emitters, GLOAD -1.7% Increased gas-fired generation 29

Increased gas-fired generation Percentage of Total US Annual Electrical Generation by Fuel Type 30

What Happened? Oversupply of allowances $4,600/ton January 2009, $51/ton October 2012 Oversupply of allowances Market uncertainty Less than forecast electric demand – Top 200 NO x emitters, GLOAD -1.7% Increased gas-fired generation – April 2012, Coal = Gas = 32% 31

Gas Got Cheap 32

What’s Driving Gas Pricing? 33

What’s Driving Gas Pricing? 34

Total Monthly Average Ozone Season Allowance Costs at 3.0 lb NO x / MWh, Monthly Average Natural Gas Electrical Generation Costs, "53 SCR Boiler" Average Ozone Season Emission Rates. 35

Gas Got Very Competitive 36

Total Monthly Average Ozone Season Allowance Costs at 3.0 lb NO x / MWh, Monthly Average Natural Gas Electrical Generation Costs, "53 SCR Boiler" Average Ozone Season Emission Rates. 37 Approximate SCR Ammonia Cost / MWh

Low AlabamaArkansasGeorgiaMaryland High MissouriNew Hampshire New YorkPennsylvania ArizonaColoradoKansasMontanaNevadaTexasWyoming CAIR-region States with Representative Low and High Average NO x Emission Rates, (lb/mmBTU), of SCR-Equipped Coal-Fired EGUs in the 2013 Ozone Season. Average 2013 Ozone Season NO x Emission Rates, (lb/mmBTU), of SCR-Equipped Coal-Fired EGUs in Western States that are not in the CAIR Cap and Trade Program. 38

Reduced, “Sub-Optimal” SCR Operation NO x Emission Rates, lb/mmBTU Plant Location Best Year PA (2003) MO (2009) KY (2006) WV (2004) NC (2004) IL (2004)

Reduced, “Sub-Optimal” SCR Operation? 40

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44

45

46

47

48

49

50

51

52

Total Excess NO x Emissions (tons) from Coal-Fired SCR-Equipped EGUs in 2013 Top 200 Emitters in Eastern US Total = 255,900 tons ,60041,10059,00061,50066,700

Increases in NO x Emissions in Coal-Fired, SCR-Equipped Electric Generating Units T. F. McNevin, Ph.D. Division of Air Quality New Jersey Department of Environmental Protection NJ Clean Air Council Princeton South Corporate Centre Ewing, NJ January 14,