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SRI/USEPA-GHG-VR-27 September 2003 Emissions of CO, THC, and CH4 were all dramatically impacted by changes in power output. Table 2-7 shows that emissions of each pollutant were low at full load, but increased greatly as power output was reduced. Emissions peaked at 50 percent of load (30 kW) and then decreased again at the lowest set- point. The variation in emissions as power output changed was further illustrated during the emissions profile test conducted at the conclusion of the controlled test periods. Results of the NOX, CO, and THC emissions measured during the profile test are shown in Figure 2-10. 900 20 CO THC NOx 800 700 600 500 400 300 200 100 18 16 14 12 10 8 6 4 2 00 60 55 50 45 40 35 30 25 20 15 Power Output (kW) Figure 2-10. Capstone 60 Emissions as Function of Power Output The profile test showed that emissions of each pollutant were variable and generally increased as power output decreased. Emissions of CO and THC showed an inverse relationship to NOX emissions which is typical with most combustion sources. Concentrations of CO2 in the CHP system exhaust gas averaged 1.76 percent at full load and decreased as power output was reduced to a low of 1.11 percent. These concentrations correspond to average CO2 emission rates of 1.54 lb/kWhe and 2.89 lb/kWhe, respectively. The CHP system CO2 emission rate at full load is well below the average rate for coal-fired power plants in the U.S. (2.26 lb/kWh) and slightly higher than natural gas-fired power plants (1.41 lb/kWh). Emissions of CO2 were also not significantly affected by changes in operation of the heat-recovery unit. 2-15 CO and THC Conc. (ppmvd @ 15% O2) NOX Conc. (ppmvd @ 15% O2)PDF Image | Environmental Technology Verification Report
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