powerstation NOx from Craig The Craig powerstation is the largest uncontrolled NOx source in the state 18k tons yr NPS is lobbying EPA for stricter controls ie SCR on all three boilers ID: 808865
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Slide1
Ozone and nitrogen deposition from Colorado’s Craig
powerstation
Slide2NOx
from Craig
The Craig powerstation is the largest uncontrolled NOx source in the state (~18k tons/yr)NPS is lobbying EPA for stricter controls (i.e., SCR on all three boilers)What is the impact in terms of
Ozone
Nitrogen
dep
PM nitrate
Slide3Approach
Reduce NO and NO2 emissions from Craig w.r.t. three proposed scenarios
NPS option is most stringent with full SCRReduce NOx from ~18k tons/yr to ~3k tons/yrRun CAMx
for a year (2005) with 12km 4CAQTF inputs
Slide4Regional N
dep
from Craig
Slide5ROMO N
dep
from Craig
Slide6Peak ozone impacts from Craig
Slide7Ozone from Craig at Flat Tops WA
Slide8VOC vs.
NOx
from OMIHCHONO2HCHO/NO2HCHO and NO2 can be detected from the OMI satellite, and provide ‘indicator species’ to help assess whether a region is VOC or NOx limited. HCHO/NO2 > 1Suggests NOx limited(Duncan et al., 2010)
Craig
Slide9ROMO nitrate from Craig
Slide10Summary
Given VOC/
NOx ratios in northwestern CO, NOx controls should be effective for reducing ozone, N dep, and hazeNOx emissions from O&G development in the region (Uintah, Piceance, and SW
Wyo) are also a concernEmissions at the surface: shorter transport?This sector is growing, and NOx controls may be harder to apply
Slide11Summary (cont’d)
The benefits from full SCR at Craig could be significant:
Ozone:2 – 6 ppb (8 hr avrg) ozone reduction at Flat Tops WA1 – 2 ppb at ROMON dep
:0.2 kg N/ha/yr reduction at Mt Zirkel
0.14
kg N/ha/
yr
reduction at
ROMO
PM nitrate:
0.6
ug
/m3 reduction
at
ROMO
Slide12Summary (cont’d)
Nitrate behavior seems a little strange
N dep at ROMO was ~linear w.r.t. to reductions Next time should use plume-in-grid to better capture high NOx chemistry