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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Landfill/Digester Gas Use with the Capstone MicroTurbine Moreover, the fuel filters should be inspected within 1000 hours of a siloxane filter media change. The change of the siloxane media introduces new particulate impurities to the system that will likely be captured by the fuel filters at the inlet of the MicroTurbine (if the siloxane removal system is placed as shown in Figure 1). Thus, it may be necessary to change the fuel filters soon after a change of the siloxane filtration media to ensure that the fuel filters do not become significantly clogged and allowing additional impurities to pass into the MicroTurbine. Siloxane Concerns Siloxanes are composed of carbon (C), hydrogen (H), oxygen (O), and silicon (Si) and are relatively volatile organic/silicon compounds manufactured and used as a basic building block monomer for polymerized silicone formations. Further, siloxanes are used extensively in consumer products as a volatile dispersant agent to help evenly spread organic-based specialty chemicals. Some of these products include deodorant, lipstick, and makeup. As man-made compounds that typically are washed down the drain or thrown in the trash, siloxanes are ALWAYS found in landfill gas and wastewater treatment plant digester gas. However, siloxanes are NOT likely to be found in certain other types of digester gases. Examples of operations that are likely to produce siloxane-free digester gas include the following: ! Dairyandhogfarms(manuredigesters). ! Breweriesandethanolplants. ! Foodprocessingplants. Analysis of biogas from wastewater treatment plant digesters and landfills reveals that cyclic (ring-structure) siloxanes are the most prevalent form. Figure 3 presents the structure of a specific siloxane molecule, commonly called D4, found in wastewater treatment plant digester gases. However, since many other types of siloxanes may be present in biogas, a complete fuel analysis should be performed to identify the types and quantities of other present siloxane molecules, so that the appropriate graphite media may be used for optimal filtration. 480002-001 Rev C (February 2004) Page 11 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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