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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Microturbine System Emissions Greenhouse Gas Emissions Many gasses are considered “greenhouse gasses”, and agencies have ranked them based on their global warming potential (GWP) in the atmosphere compared with carbon dioxide (CO2), as well as their ability to maintain this effect over time. For example, methane is a greenhouse gas with a GWP of 21. Criteria pollutants like NOx and organic compounds like methane are monitored by local air permitting authorities, and are subject to strong emissions controls. Even though some of these criteria pollutants can be more troublesome for global warming than CO2, they are released in small quantities – especially from Capstone microturbines. So the major contributor of concern is carbon dioxide, or CO2. Emission of CO2 depends on two things: 1. Carbon content in the fuel 2. Efficiency of converting fuel to useful energy It is for these reasons that many local authorities are focused on using clean fuels (for example natural gas compared with diesel fuel), achieving high efficiency using combined heat and power systems, and displacing emissions from traditional power plants using renewable fuels like waste landfill and digester gasses. Table 5 shows the typical CO2 emissions due to combustion for different Capstone microturbine models at full power and ISO conditions. The values do not include CO2 that may already exist in the fuel itself, which is typical for renewable fuels like landfill and digester gas. These values are expressed on an output basis, as is done for criteria pollutants in Table 1. The table shows the pounds per megawatt hour based on electric power output only, as well as considering total useful output in a CHP system with total 70% efficiency (LHV). As for criteria pollutants, the relative quantity of CO2 released is substantially less when useful thermal output is also considered in the measurement. Table 5. CO2 Emission for Capstone Microturbine Models in [lb/MWh] Model Fuel CO2 Electric Only 70% Total CHP C30 NG Natural Gas (1) 1,690 625 CR30 MBTU Landfill Gas (1) 1,690 625 CR30 MBTU Digester Gas (1) 1,690 625 C30 Liquid Diesel #2 (2) 2,400 855 C65 NG Standard Natural Gas (1) 1,520 625 C65 NG Low NOx Natural Gas (1) 1,570 625 C65 NG CARB Natural Gas (1) 1,570 625 CR65 Landfill Landfill Gas (1) 1,520 625 CR65 Digester Digester Gas (1) 1,520 625 C200 NG Natural Gas (1) 1,330 625 C200 NG CARB Natural Gas (1) 1,330 625 CR200 Digester Digester Gas (1) 1,330 625 Notes: (1) Emissions due to combustion, assuming natural gas with CO2 content of 117 lb/MMBTU (HHV) (2) Emissions due to combustion, assuming diesel fuel with CO2 content of 160 lb/MMBTU (HHV) 410065 Rev. B (April 2008) Page 5 of 6 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Technical Reference Capstone MicroTurbineTM Systems Emissions
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