Abstract
Bed materials and their catalytic activity are two main parameters that affect the performance of the dual fluidized bed (DFB) gasification system in terms of product gas composition and tar levels. Two sources of bed materials were used for the operation of a commercial DFB gasification system in Thailand, using woodchips as a biomass feedstock. One source of the bed materials was the calcined olivine which had been used in the Gussing Plant, Austria, and the other activated bed material was a mixture of fresh Chinese olivine and used Austrian olivine with additives of biomass ash, calcium hydroxide and dolomite. These bed materials were collected and analysed for morphological and chemical composition using a scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray fluorescence spectroscopy (XRF). The product gas was cleaned in a scrubber to remove tars, from which the samples were collected for gravimetric tar analysis. Its composition data was automatically recorded at the operation site before it entered the gas engine. From the SEM, EDS and XRF analyses, calcium-rich layers around the bed materials were observed on the activated bed material. The inner layers of bed materials collected were homogeneous. Biomass ash, which was generally added to the bed materials, had significant calcium and potassium content. These calcium-rich layers of the bed materials, from the calcium hydroxide, biomass ash and dolomite, influenced system performance, which was determined by observing lower tar concentration and higher hydrogen concentration in the product gas.
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Acknowledgements
The authors sincerely thank Markus Koch, the Gussing Plant manager for the successful operation of the Nong Bua Plant during experiments in this article. The authors appreciate support from Christian Henrich, the Nong Bua project manager, for his contribution and Stefan Gunnarsson and Peter Pessl for financial arrangement support. The authors greatly acknowledge King Mongkut’s Institute of Technology Ladkrabang (KMITL) Research Fund Grant Number KREF206312 for financial support, and SEM, EDS and tar analysis. The authors deeply thank TU Wien (TUW) for XRF and XRD analysis, Gussing Renewable Energy (Thailand) Co. Ltd for the support on finance, human resources and data collection and financial support from Michael J. Dichand, International Business Development Shareholder, Gussing Renewable Energy International Holding GmbH.
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This research was funded by King Mongkut’s Institute of Technology Ladkrabang (KMITL) Grant Number KREF206312, Gussing Renewable Energy (Thailand) Co. Ltd and Gussing Renewable Energy International Holding GmbH and Michael J. Dichand, International Business Development Shareholder, Gussing Renewable Energy International Holding GmbH.
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Siriwongrungson, V., Hongrapipat, J., Kuba, M. et al. Influence of bed materials on the performance of the Nong Bua dual fluidized bed gasification power plant in Thailand. Biomass Conv. Bioref. 12, 2965–2979 (2022). https://doi.org/10.1007/s13399-020-00908-6
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DOI: https://doi.org/10.1007/s13399-020-00908-6