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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Landfill/Digester Gas Use with the Capstone MicroTurbine As more stringent NOx emission requirements are imposed, generators other than Capstone MicroTurbines are being forced to incorporate post-combustion catalytic controls. Silica particles in the exhaust gas from these generators operating on biogas have been observed to blind the catalyst and render it ineffective within a few hours of operation. For these reasons, as technology is driven towards higher performance levels and lower emissions, siloxane removal is expected to become a more common process step in all biogas power generation systems, not just in Capstone MicroTurbine systems. Siloxane Removal Concerns (Capstone MicroTurbines) Applied Filter Technology (AFT) of Snohomish, Washington provides siloxane removal systems and services specifically designed for Capstone MicroTurbines. Upon request, Capstone will review and may approve the use of other systems or vendors that can reliably meet the basic requirement of no detectable siloxanes (<5 ppb) in the fuel entering the Capstone MicroTurbine. The basic technology is absorption of siloxanes in the pores of graphite media. Applied Filter Technology has a number of different media with different pore sizes and structures, and layers them differently for each biogas to optimize overall performance. Applied Filter Technology refers to this system as Segmented Activity Gradient (or SAG). The services performed by Applied Filter Technology include the following: ! Providing the special gas sampling equipment and method needed to obtain an accurate siloxane analysis. ! Coordinationwiththeanalyticallaboratory. ! Evaluationoftheconcentrationsofsiloxanesandotherorganiccompounds. ! Calculationofremovalefficienciesandmediareplacementrates. ! Designandmanufactureofthesiloxaneremovalsystem. ! Engineeringconsultationasnecessary. In order to keep the cost to a minimum, the siloxane removal system may be designed without a lead-lag vessel system. Bypassing the vessel for a couple of hours while the media is being changed will not cause any measurable loss in Capstone MicroTurbine performance, if this operation is performed just a few times a year. A biogas with an extremely high concentration of siloxanes would be treated as an exception to this typical guideline. 480002-001 Rev C (February 2004) Page 13 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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