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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Landfill/Digester Gas Use with the Capstone MicroTurbine Ideally, the dew point temperature of the fuel entering the gas compressor should be lower then 60° F for maximum protection of the compressor, but if 60° F or lower dew point temperatures cannot be achieved, then the lowest possible dew point temperatures should be obtained. In some cases, it may be necessary to modify the compressor to run hotter internally to prevent moisture from condensing within the compressor; although this is not always a viable option. In some installations, a refrigerated gas dryer will be used instead of a chiller on the discharge side (high pressure side) of the gas compressor. Many refrigerated dryers use timer-based drainage systems for purging of the collected condensate. Since many of these dryers are placed after the gas compressor, but still in close proximity to the compressor discharge, there is the possibility that the dryer draining periods will cause a local drop in pressure that can be detected by the gas compressor. This condition often results in a cycle of the compressor rpm (for systems with a variable speed drive) each time the dryers opens its drain. If such events are severe and occur rapidly, it may result in an accelerated loss of compressor oil into the gas stream. This situation, however, may be addressed in several ways, from the addition of a small buffer tank, to the addition of a small restriction in the dryer drain line that minimizes gas loss and local pressure fluctuation. Note that if the siloxane filter vessel is located relatively close to the compressor and dryer, the vessel may double as a high-pressure buffer tank. This minimizes the pressure fluctuation that would otherwise be seen by the MicroTurbines while assisting the gas compressor to cope with the local loss in pressure from the refrigerated dryer drain. Filter Element Concerns Following commissioning of MicroTurbines using digester gas or landfill gas as fuel, the coalescing filters on the Capstone external fuel kit and inside the MicroTurbine enclosure should be inspected once a week during the first month of operation. These inspections will determine whether the filters are wet or dry, and if they are collecting significant amounts of particulate matter (such as carbon particles from the siloxane filters). If the filters are wet, the gas does not meet the Capstone fuel specification. As a consequence, performance of the MicroTurbine will be impacted, and the warranty may be voided if damage to fuel system components is caused by fuel moisture. If this occurs, take corrective action to the fuel delivery system: replace the filter elements, and continue checking once a week for several weeks, to verify that the filters remain dry. Notice that the inside surface of the cylindrical filter element is the surface that collects the particulate matter. Once the weekly filter inspections have verified that the fuel is dry, it is recommended that at least one filter be inspected every month for several months. Depending on the results of these inspections, it may be necessary to change the filter elements more often than every 8,000 hours (which is the guideline for pipeline-quality natural gas), as noted in the MicroTurbine Standard Maintenance Work Instruction (440000). 480002-001 Rev C (February 2004) Page 10 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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