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o Proven thermal capacity on top of a C30 microturbine at full load: > 60 kWth (overall efficiency: > 84%) • Flue gas backpressure of max. 15 mbar Capstone Gas Safeguard Module In Europe, all microturbines have to deal with additional standards regarding gas safety issues. Gas safety demands for cogeneration equipment are non-transparent. This equipment originally did not correspond to equipment based on Gas Appliance Directives but was not explicitly excluded either. As a result, cogeneration equipment fell into an undefined area. Therefore, Gasunie Engineering & Technology, in cooperation with the safety department of N.V. Nederlandse Gasunie and a manufacturer, developed a Gas Safeguard Module for microturbines meeting these additional standards on European gas safety, especially the gas regulations for gas turbines [1]. This Gas Safeguard Module can also be adjusted for other types of microturbines. After listing the additional gas safety standards and the resulting safety issues and parameters that had to be controlled, a manufacturer involved in the project designed the gas safeguard module on the basis of commercially available components. The Gas Safeguard Module is based on an extra line of defense (diversity) parallel to the existing control and is based on PLC technology. It can be placed over Capstone I/O signals, flows and measured parameters and acts as a redundancy of the Capstone hardware on gas safety. For example, one extra component is a shut down valve outside the Capstone microturbine. Both the Gas Safeguard Module and the Capstone hardware on gas safety can shut down this valve. An external bleed valve is also introduced to prevent any released natural gas in the combustion chamber and/or inside the microturbine casing. For meeting ATEX regulations, these two valves are mounted outside the microturbine casing. This redundant control substantially improves safety by minimizing the chance of common cause failures. Diversity is accomplished by separately monitoring the gas turbine process within the following measurements: • Mass flow of combustion air as a parameter for purge flow and indication for rotational speed • Natural gas flow as a parameter for starting load and maximum load • Temperature measurement due to flame detection and flame loss and overload. Originally this was a lambda probe situated in the flue gases of the microturbine. Because of repeatable malfunction of this lambda probe in a demonstration project, it is replaced by a temperature signal (TET: turbine exit temperature). An additional flow measurement has been installed in the ventilation channel of the Capstone casing, also to meet ATEX regulations [2]. Some status signals of the controls of the microturbine have been passed to the Gas Safeguard Module. The Gas Safeguard Module controls the following microturbine processes: • Starting (including starting load monitoring and control) and stopping conditions • Purging conditions • Ignition conditionsPDF Image | DEMONSTRATION OF CAPSTONE MICROTURBINES INCLUDING HIGH EFFICIENCY HEAT EXCHANGER, GAS SAFEGUARD MODULE AND NATURAL GAS COMPRESSOR, DEVELOPED BY GASUNIE ENGINEERING & TECHNOLOGY
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DEMONSTRATION OF CAPSTONE MICROTURBINES INCLUDING HIGH EFFICIENCY HEAT EXCHANGER, GAS SAFEGUARD MODULE AND NATURAL GAS COMPRESSOR, DEVELOPED BY GASUNIE ENGINEERING & TECHNOLOGYOriginal File Name Searched:
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