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5.1 AIR QUALITY <br /> SO2 emissions were calculated from the heat input(in MMBtu) and an SO2 emission factor (in <br /> lb/MMBtu). SO2 emissions were calculated based on the maximum allowable fuel sulfur <br /> content of 1 grain per 100 standard cubic feet (scf) and the heat input rates in Table 5.1-17. <br /> Maximum hourly PM10 emissions reflect expected turbine/HRSG performance,based on <br /> emissions limits from similar installations. PM2.5 emissions were determined based on the <br /> assumption that all particulate matter emissions are less than 2.5 microns in size. <br /> Maximum emission rates are summarized in Table 5.1-18. The BACT analysis upon which <br /> the emission factors are based is presented in Appendix 5.1C and summarized in <br /> Section 5.1.7. <br /> TABLE 5.1-18 <br /> Maximum Emission Rates-Combustion Turbine/HRSG <br /> Pollutant PPmv @ 15%02 Ib/MMBtu Ib/hr <br /> Combustion Turbine without Duct Firing <br /> NO. 2.0 0.0072 13.64 <br /> S02 0.57 0.0028 5.37 <br /> CO 3.0 0.0066 12.46 <br /> VOC 1.4 0.0018 3.33 <br /> PM10/PM2.5° -- - 9.0 <br /> Combustion Turbine with Duct Firing <br /> NOX 2.0 0.0072 15.25 <br /> S02 0.57 0.0028 6.00 <br /> CO 3.0 0.0066 13.93 <br /> VOC 2.0 0.0028 5.32 <br /> PM10/PM2.5° -- -- 11.0 <br /> 'NO., CO,VOC, and PM10 emission rates exclude startups and shutdowns(see Table 5.1-19). <br /> bBased on maximum natural gas sulfur content of 1 gr/100 scf. See text. <br /> °Includes front and back half. <br /> Emissions During Startup and Shutdown <br /> Emissions of NO,,,CO, and VOC during turbine startup and shutdown will be higher than <br /> under normal operating conditions because the unit must operate at reduced loads while <br /> downstream components,including the HRSG, gas turbine and emissions control systems <br /> reach operating temperatures. As discussed in Section 2,NCPA is installing Rapid Response <br /> technology at LEC to minimize startup times;this technology is expected to significantly <br /> reduce startup times and,consequently,startup emissions. However,peak hourly emissions <br /> during startup will not necessarily be reduced. Further, since no Rapid Response <br /> configuration plants have yet been built or operated,no in-use operating data are yet <br /> available to allow observation and evaluation of the actual times required for a unit to come <br /> into compliance during a startup. Therefore,NCPA is conservatively assuming that the times <br /> required for startups of the LEC will be the same as those for conventional Frame 7-based <br /> combined cycle turbine plants. <br /> SAC/371322/082410013(LEC_5.1_AIR_QUALITY.DOC) 5.1-25 <br />