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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Landfill/Digester Gas Use with the Capstone MicroTurbine Aside from the direct impacts that moisture may have in the MicroTurbine itself (which may include stuck fuel valves and plugged fuel injectors), moisture may also present a significant indirect affect to the MicroTurbine. In some biogas applications, it may be necessary to filter out several components of the fuel known collectively as siloxanes (see below for additional detail on siloxanes). Many of the filters that are used for siloxane removal are impaired by the presence of liquid condensate, which in turn, may allow siloxanes to reach and impact the MicroTurbines. For this reason, the temperature of the fuel must be higher then the fuel’s dew point when passing through the siloxane removal devices. In Figure 1, for example, this is accomplished by placing the siloxane removal after a gas dryer. Drain lines from all condensate producing devices should be directed towards an appropriate drainage disposal facility/equipment. Since there are many points of condensate drainage from the system, care should be taken to avoid over- pressurizing the drainage lines themselves. Condensate drain lines from high- pressure sources should not be tied together with drain lines from low-pressure sources. Ideally, all drain lines should be kept separate. However, should any drain line manifolding occur, it would be necessary to add check valves to the drain lines of all devices. Timer-based drainage systems have proven to be common in many applications, especially with refrigerated dryers. Other types of drains and traps are also used to as part of an effort to create a fully automatic drainage system for a pretreatment system. However, even if a fully automatic drainage system is in place, all condensate traps on the drain line should have a bypass available for manual draining should an issue arise with an existing trap. Furthermore, if an installation will be operated without oversight for any length of time, the drainage system should also include high-level switches as alarms to cease operation of the overall installation in the event that some portion of the drainage system fail. When possible, the entire system, including the drainage system, should be manually inspected for potential or developing issues. It is recommended that such inspections occur daily for a new installation. Capstone can assist business partners and end-users in the selection of appropriate equipment, and in the design and integration of the fuel processing equipment into the overall installation. However, 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 8 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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