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5. CONCLUSION Equipment to incorporate a Capstone microturbine for a number of combined heat & power applications has been developed and demonstrated to work properly by Gasunie Engineering & Technology (GET). A robust high efficiency small scale heat exchanger has been developed and tested. The test results have met the specifications stated for Capstone microturbines (30 kWe and 60 kWe types), i.e. total efficiency > 83% based on 70/90 °C water systems and backpressure lower than 15 mbar. A demonstration project in which a Capstone 30 kWe is equipped with a commercial model of the heat exchanger is currently being started up. A Capstone Gas Safeguard Module, adaptable for other types of microturbines, has been developed and demonstrated. It meets the current Gas Appliance Directive, gas regulations for gas turbines and ATEX regulations (e.g. ATEX 137). This Safeguard is based on an extra “line of defence” parallel to the existing control and is based on PLC technology. The standard flame detection has been replaced by a temperature signal (TET: turbine exit temperature). A commercially ripe design has been made for both Capstone 30 and 60 kWe microturbines, using different software parameters. A high efficiency natural gas vane compressor (explosion safe) has been developed, suitable for use in Capstone 30 kWe and 60 kWe microturbine with relatively low calorific (Groningen) natural gas. Current natural gas compressors are not efficient enough, oversized or too expensive. Power consumption of these vane compressors are: 1.5 kWe for the 30 kWe Capstone microturbine and 3 kWe for the 60 kWe Capstone microturbine at full load (inlet pressure of the compressor: 25 mbar). In a demonstration project, the Capstone Gas Safeguard Module and the High Efficiency Natural Gas Vane Compressor in combination with a Capstone 60 kWe have been tested. The flue gases of the microturbine are fed into a spray dryer. From October 2004 to December 2005 no serious malfunctions have occurred. In this period, 963 starts and 6,798 running hours were made. These systems are at present commercially ripe and we are open to other parties for market introduction. Contact information: Gasunie Engineering & Technology P.O. Box 19 9700 MA Groningen The Netherlands get@gasunie.nl www.getgasunie.nl 6. REFERENCES 1. Regulations for the use of natural gas in gas turbine installations, Gasunie, October 1993 2. NPR7910-1, NEN-EN-IEC 60079-10:1997, ATEX directives and their application to gas turbines, European Commission ENTR/G/3/DE D(2000), Directive 1999/92/EG ATEX 137PDF 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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