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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) In some applications, the siloxane removal system may be designed without a lead- lag vessel system; however, a lead-lag vessel system is strongly recommended to allow for gas sample collection and testing between the two vessels. This will allow for the detection of siloxanes breaking through the first filter vessel without exposing the turbines to unfiltered fuel. Hydrogen sulfide (H2S) is normally present in biogas, and is preferentially absorbed in graphite media. Sites with high H2S content in the biogas may require more extensive fuel treatment systems (possibly including separate H2S removal) to ensure complete removal of siloxanes with reasonable run lengths between graphite media changes. Materials of Construction Concerns Biogas is sour gas, containing H2S in the 100 to 10,000 ppm range. High CO2 content makes it acidic as well. Biogas condensate is a foul-smelling, noxious material that contains some difficult-to-handle compounds. Stainless steel, plastic, and aluminum are the preferred materials of construction. Parts made of yellow metals, such as brass valves and copper heat exchanger tubes are inappropriate. Carbon steel will also eventually corrode, leaving byproducts that can clog and damage other equipment. Resources Capstone is not responsible for the design, installation, or operation of the fuel conditioning and delivery system, including the siloxane filtration system. Proper maintenance of the fuel delivery system is imperative for the microturbine to perform properly and remain within its routine maintenance intervals. Designers and/or end- users with little or no practical experience in installing and/or operating a biogas-to- energy project may benefit from using services of companies experienced in this field. Capstone does not recommend that those inexperienced in biogas applications undertake such projects without engaging appropriately skilled personnel as these can be particularly technically challenging applications. 480002 Rev D (October 2011) Page 13 of 14 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or 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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