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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Microturbine System Emissions Table 2 provides the same output-based information shown in Table 1, but expressed in grams per horsepower hour (g/hp-hr). Table 2. Emission for Different Capstone Microturbine Models in [g/hp-hr] Model Fuel NOx CO VOC (5) C30 NG Natural Gas (1) 0.22 0.60 0.078 CR30 MBTU Landfill Gas (2) 0.22 7.4 0.340 CR30 MBTU Digester Gas (3) 0.22 3.7 0.340 C30 Liquid Diesel #2 (4) 0.90 0.14 0.078 C65 NG Standard Natural Gas (1) 0.16 0.42 0.034 C65 NG Low NOx Natural Gas (1) 0.06 0.44 0.034 C65 NG CARB Natural Gas (1) 0.06 0.08 0.017 CR65 Landfill Landfill Gas (2) 0.16 1.4 0.034 CR65 Digester Digester Gas (3) 0.16 1.4 0.034 C200 NG Natural Gas (1) 0.14 0.37 0.034 C200 NG CARB Natural Gas (1) 0.05 0.07 0.014 CR200 Digester Digester Gas (3) 0.14 1.3 0.034 Notes: - same as for Table 1 Emissions may also be reported on a volumetric basis, with the most common unit of measurement being parts per million. This is typically a measurement that is corrected to specific oxygen content in the exhaust and without considering moisture content. The abbreviation for this unit of measurement is “ppmvd” (parts per million by volume, dry) and is corrected to 15% oxygen for electrical generating equipment such as microturbines. The relationship between an output based measurement like pounds per MWh and a volumetric measurement like ppmvd depends on the characteristics of the generating equipment and the molecular weight of the criteria pollutant being measured. Table 3 expresses the emissions in ppmvd at 15% oxygen for the Capstone microturbine models shown in Table 1. Note that raw measurements expressed in ppmv will typically be lower than the corrected values shown in Table 3 because the microturbine exhaust has greater than 15% oxygen. Another volumetric unit of measurement expresses the mass of a specific criteria pollutant per standard unit of volume. Table 4 expresses the emissions in milligrams per normal cubic meter at 15% oxygen. Normal conditions for this purpose are expresses as one atmosphere of pressure and zero degrees Celsius. Note that both the ppmvd and mg/m3 measurements are for specific oxygen content. A conversion can be made to adjust either unit of measurement to other reference oxygen contents, if required. Use the equation below to convert from one reference oxygen content to another: Emissions at New O2 = (20.9 – New O2 Percent) X Emissions at Current O2 (20.9 – Current O2 Percent) For example, to express 9 ppmvd of NOx at 15% oxygen to ppmvd at 3% oxygen: Emissions at 3% O2 = (20.9 – 3.0) X 9 = 27 ppmvd (20.9 – 15.0) 410065 Rev. B (April 2008) Page 2 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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