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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Landfill/Digester Gas Use with the Capstone MicroTurbine Also in the aforementioned document, the table titled “Gaseous Fuel Contaminants Limitations,” presents the required fuel contaminant limitations for gaseous fuel. All limitations must be observed for compliance. The limitation regarding the presence of siloxanes, however, is specific to both landfill gas and wastewater treatment plant digester gas. This limitation is identified as follows: ! Siloxanes must be limited to a maximum of 5 parts per billion (ppb) by volume. This is approximately the detection limit for siloxanes. ! Effectively, this limitation means that the fuel must contain no detectable level of siloxanes. Some of the implications of these requirements are discussed in the following paragraphs. The focus is primarily on moisture and siloxane removal. Typical Biogas Fuel Delivery System A flowsheet for a typical biogas fuel preparation and delivery system to the Capstone MicroTurbine is provided in Figure 1. Not all of the steps may be required for all sites, and the steps may appear in different sequences in other cases. An example of a fuel pretreatment system not requiring initial sediment filtration nor pre- compressor dew point suppression is illustrated in Figure 2; however, as is described throughout this document, though often similar, every biogas installation is unique, and proper care should be taken when engineering the pretreatment system for a given application. Capstone recommends that a sediment trap or filter be placed at the beginning of the line coming from the main gas manifold or pipe to the MicroTurbine plant. This filter will eliminate most of the black powder sludge material (corrosion products) and scale coming from the existing plant systems. Appropriate care should be taken to provide for the adequate drainage and disposal of any condensate and sediments/solids captured by this trap. The siloxane filter can be placed either before or after the compressor (it is shown after the compressor in Figure 1). Placement of this filter will affect the pressure rating, overall size, and cost of the vessel, as well as the cost of graphite media replacement. Other considerations should be made when determining the overall configuration and layout of the equipment, including the siloxane filter. These additional considerations are discussed at length throughout this application guide. Decisions such as these are a function of the existing site features, the preferences of the designer and end-user, and the size of the facility (that is, the quantity of Capstone MicroTurbines). The Capstone business partner or end-user is responsible for the fuel delivery system, and may use any equipment that reliably meets the fuel inlet requirements of the Capstone MicroTurbine. 480002-001 Rev C (February 2004) Page 3 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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