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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Landfill/Digester Gas Use with the Capstone MicroTurbine Fuel Pressure Concerns As mentioned previously, rotary sliding vane compressors have shown a tolerance for hydrogen sulfide in low to moderate levels. However, regardless of the compressor technology ultimately employed, the ability of the gas compressor (a.k.a. fuel gas booster) to supply an adequate level of pressure is vital to the success of the installation. The Capstone MicroTurbine Fuel Requirements Technical Reference (410002) provides useful information indicating that a decrease in the energy content of the fuel will require an increase in the available pressure at the fuel valve of the MicroTurbine; however, the gas compressor is still required to provide gas pressures in the range of 90-95 psig at the compressor discharge point for low and medium Btu installations. This increased pressure discharge from the compressor compensates for several things. First, it provides sufficient pressure to overcome the pressure losses across most devices downstream of the compressor and upstream of the MicroTurbine. Second, it allows for a minimum of 12-15 psig pressure drop across the pressure regulator on the external fuel kit near the inlet of the MicroTurbine. This pressure drop allows the regulator to adequately protect the MicroTurbine from most moderate pressure fluctuations upstream of the regulator as well as the fluctuations caused by the starting/stopping of additional MicroTurbines consuming fuel from the same fuel header. Third, this compressor discharge pressure allows the MicroTurbine to receive the necessary fuel pressure it requires in steady fashion, which may be as high as 70-74 psig in low Btu applications. The ability of the gas compressor to maintain the required pressure levels, as well as successfully operate in the long term, is affected by the levels of Hydrogen Sulfide (H2S), Carbon Dioxide (CO2), gas moisture content and the actual frequency of oil changes. Many compressors that operate on biogas will use specific oils intended to both lubricate the compressor, as well as provide some degree of protection against corrosion. Since the level of both H2S and CO2 in a fuel is very site specific, the rate of oil degradation is site specific as well. Thus, it may be necessary to periodically sample and test the oil to determine the frequency of required compressor oil changes to maintain compressor life and performance. A serious consideration for the gas compressor, regardless of the technology utilized, is the temperature of the inlet gas stream. As discussed previously, the fuel coming to the gas compressor will probably be saturated with moisture. Since the ability of this type of fuel to hold moisture increases dramatically with temperature, it will often be required to pre-cool the fuel to a lower temperature and remove the resulting condensate (see Figure 1). This ensures that the moisture in the fuel does not leave the vapor state as it passes through the gas compressor. Biogas from an anaerobic digester, and at some landfills, may arrive at the pretreatment system at temperatures in excess of 120 degrees Fahrenheit. 480002-001 Rev C (February 2004) Page 9 of 16 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the equipment ratings, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Application Guide Landfill/Digester Gas Use with the Capstone MicroTurbine
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