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Micro gas turbine running on naturally aspirated syngas: An experimental investigation

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  • Al-attab, K.A.
  • Zainal, Z.A.

Abstract

Syngas produced from fixed bed gasifier suffers from high inert diluents (N2+ CO2) in the range of 60–65 vol.%. Hence, higher energy is required for syngas external compression making this concept less profitable for small scale micro gas turbine (MGT) applications. A new method was proposed in this study to eliminate the external compression of syngas by inducing air−syngas mixture directly through the MGT's compressor. Turbocharger based MGT with pressurized cyclone combustor (PCC) were developed to evaluate the new concept experimentally. Annular tube heat recovery unit (HRU) was developed to utilize the exhaust thermal power for hot air production. Stable syngas combustion was achieved with air-fuel ratio in the range of 3.3–4.1. NOx and CO emissions were below 250 ppm and 15 ppm respectively, with turbine inlet temperature below 700 °C. The natural aspiration of syngas directly from the gasifier was sufficient to run the MGT at low pressure ratio of 0.4 barg, but it was not enough to generate any electrical output. Hot air thermal output was 34 kW with overall system efficiency including the gasifier of 37.8%.

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  • Al-attab, K.A. & Zainal, Z.A., 2018. "Micro gas turbine running on naturally aspirated syngas: An experimental investigation," Renewable Energy, Elsevier, vol. 119(C), pages 210-216.
    • Handle: RePEc:eee:renene:v:119:y:2018:i:c:p:210-216
    DOI: 10.1016/j.renene.2017.12.008
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    References listed on IDEAS

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