Analysis of 2007 Emissions from Power Plants and Other ... - MARAMA

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March 2011Page 24Analysis of Emissions from Power Plants and Other Large Combustion SourcesZooming in on August 2007, Figure 3-4 plots the daily NOx emissions from each of thethree classification bins. The five-day period of august 6-10 was characterized by a strongupper-level ridge that produced hot weather over most of the southern and eastern UnitedStates on August 7 and 8. High temperatures in most of the region were about 10 degreesabove normal. In Virginia, for example, this heat wave brought Richmond its hottest dayin roughly 30 years - the actual high temperature of 104 degrees on August 8 th . The heatwave was short-lived with the passage of a backdoor cold front into the mid-Atlantic byAugust 10 th , resulting in the core of the hot air being pushed south of the Virginia-NorthCarolina border. During this heat wave, the relative importance of the emissions fromunits in the 15-50% and 50 15-50
Analysis of Emissions from Power Plants and Other Large Combustion Sources March 2011Page 254 Hourly Emissions by Operating TimeWhat is the time-of-day variability by source grouping?The following charts show how NOx emissions for these three classification bins vary bytime of day.Figure 4-1 shows how 2007 annual NOx emissions vary by time-of-day for units in each ofthe three classification bins. Emissions from units in the >50% bin exhibit only a smalldiurnal variation. Emissions from units in the 15-50% bin are lower during the overnighthours and build to relatively constant levels during business hours from 8am to 8pm.Emissions from units in the 50%bin are relatively constant and similar to the annual pattern. The February time-of-daypattern for units in the 15-50% bin shows mid-morning and late-afternoon peaks. TheFebruary pattern differs from the annual pattern for these units with lower emissions in thenoon-4pm period. The February pattern for units the 50% binshow more variation that the annual or February patterns for these units. There is morediurnal variation with emissions gradually building during the afternoon hours anddecreasing overnight. The August time-of-day patterns for units in both the 15-50% and
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State Primary Fuel NOx ControlCapac
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State Primary Fuel NOx ControlMDCoa
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State Primary Fuel NOx ControlPAPAC
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Table 13-2. Capacity percentages by
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State Primary Fuel SO 2 ControlCapa
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FIPS State Component NameCSACodeCSA
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March 2011Page B-2Draft Analysis of
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Analysis of 2007 Emissions from Power Plants and Other ... - MARAMA

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