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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Landfill/Digester Gas Use with the Capstone MicroTurbine Other considerations must also be made for the condensate removal system. For example, a device in front of the gas compressor intended for liquid/gas separation may be operating under a vacuum during normal operation. This is due to the high volume of gas that the compressor must intake in the area near its inlet to achieve the desired levels of flow and pressure. Under these conditions, care should be taken when draining condensate to avoid drawing in air that may result in MicroTurbine flameout or condensate ingestion by the gas compressor. Typical approaches may include the addition of condensate level switches and a small pump to remove the condensate; or perhaps an additional container and valves on the drain line to isolate the liquid from the vacuum so that the condensate may be manually drained while not introducing air to the fuel. Additional care should be applied to selecting the types of liquid/gas separators used in such a system. Common applications employ coalescing, mesh-pad, cyclonic, or baffled separators made of stainless steel. Such separators may be acceptable for an application for a pressurized system, but these types of separators are not always appropriate for separation at very low pressure (i.e., at the compressor inlet). For the low-pressure separator, great care should be taken in both selecting the separator size and type. The approach will be different from one site to another, depending on ambient temperatures, fuel type, moisture content, existing fuel treatment, etc. Regardless of the approach or technology applied for condensate control, it is required that all gas-wetted components be constructed of stainless steel or some other appropriate material capable of tolerating the presence of hydrogen sulfide in the system and any relevant weather conditions. In some cases, this may include the upgrade of any heat exchangers in the dryer or chiller to stainless steel. Moreover, it is highly recommended that temperature indicators and/or alarms be added, if possible, at the point of lowest temperature. This should be done so that a failure of the chiller/dryer component can be used to stop operation and provide maximum protection to the MicroTurbine and gas compressor. Since a significant portion of the overall condensate formed will occur during the after-cooling process of the gas compressor, it is recommended that some form of liquid/gas separation take place after the gas compressor, so that the operation of a refrigerated dryer/chiller is not impaired or rendered less efficient. In many cases, this separation may be achieved with the addition of a coalescing filter so that the filter can both remove liquid phase condensate as well as provide additional filtration prior to the inlet of the refrigerated dryer/chiller heat exchanger. Also, the portion of pipe directly after the compressor needs to have a method of draining into an appropriate vessel. This may require elevating the compressor so that condensate will flow away from the compressor. A check valve should also be installed directly after the compressor to prevent any moisture from flowing back into the compressor upon shutdown. 480002-001 Rev C (February 2004) Page 7 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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