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Table 3-8. Gas Turbine Emissions Characteristics Emissions Characteristics System 1 2 3 4 5 Electricity Capacity (kW) Electrical Efficiency (HHV) Emissions Before After-treatment NOx (ppm) NOx (lb/MWh) CO (ppmv) CO (lb/MWh) NMHC (ppm) NMHC (lb/MWh) Emissions with SCR/CO/CEMS NOx (ppm) NOx (lb/MWh) CO (ppmv) CO (lb/MWh) NMHC (ppm) NMHC (lb/MWh) CO2 Emissions Generation CO2 (lb/MWh) Net CO2 with CHP (lb/MWh) 3,304 7,038 24.0% 28.9% 25 15 1.31 0.65 50 25 1.60 0.66 5 5 0.09 0.08 2.5 1.5 0.09 0.05 5.0 2.5 0.11 0.05 4.3 4.3 0.08 0.06 1,667 1,381 797 666 9,950 20,336 44,488 27.3% 33.3% 36.0% 15 15 15 0.69 0.57 0.52 25 25 25 0.70 0.58 0.53 5 5 5 0.08 0.07 0.06 1.5 1.5 1.5 0.05 0.05 0.05 2.5 2.5 2.5 0.05 0.05 0.05 4.3 4.3 2.0 0.07 0.06 0.02 1,460 1,201 1,110 691 641 654 Source: Compiled by ICF from vendor supplied data, includes heat recovery Table 3-8 also shows the net CO2 emissions after credit is taken for avoided natural gas boiler fuel. The net CO2 emissions range from 641-797 lbs/MWh. A natural gas combined cycle power plant might have emissions in the 800-900 lb/MWh range whereas a coal power plant’s CO2 emissions would be over 2000 lb/MWh. Natural gas fired CHP from gas turbines provides savings against both alternatives. 3.5.2 Emissions Control Options Emissions control technology for gas turbines has advanced dramatically over the last 20 years in response to technology forcing requirements that have continually lowered the acceptable emissions levels for nitrogen oxides (NOx), carbon monoxide (CO), and volatile organic compounds (VOCs). When burning fuels other than natural gas, pollutants such as oxides of sulfur (SOx) and particulate matter (PM) can be an issue. In general, SOx emissions are greater when heavy oils are fired in the turbine. SOx control is generally addressed by the type of fuel purchased, than by the gas turbine technology. Particulate matter is a marginally significant pollutant for gas turbines using liquid fuels. Ash and metallic additives in the fuel may contribute to PM in the exhaust. A number of control options can be used to control emissions. Below are descriptions of these options. Catalog of CHP Technologies 3–17 Combustion TubinesPDF Image | EPA CHP Technologies Combustion Turbines
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