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Downdraft gasification of pellets made of wood, palm-oil residues respective bagasse: Experimental study

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  • Erlich, Catharina
  • Fransson, Torsten H.

Abstract

The downdraft gasification technology has an increased interest among researchers worldwide due to the possibility to produce mechanical and electrical power from biomass in small-scale to an affordable price. The research is generally focused on improvement of the performance and optimizing of a certain gasifier, on testing different fuels, on increasing the user-friendliness of the gasifier and on finding other uses for the product gas than in an IC-engine, for example liquid fuel production. The main objective with the gasification tests presented here is to further contribute in the field by studying the impact of the char bed properties such as char bed porosity and pressure drop on the gasification performance as well as the impact of fuel particle size and composition on the gasification process in one and the same gasifier. In addition, there is very little gasification data available in literature of "before disregarded" fuels such as sugar cane bagasse from sugar/alcohol production and empty fruit bunch (EFB) from the palm-oil production. By pelletizing these residues, it is possible to introduce them into downdraft gasification technology which has been done in this study. The results show that one and the same reactor can be used for a variety of fuels in pellet form, but at varying air-fuel ratios, temperature levels, gas compositions and lower heating values. Gasification of wood pellets results in a richer producer gas while EFB pellets give a poorer one with higher contents of non-combustible compounds. In this gasification study, there is almost linear relation between the air-fuel ratio and the cold-gas efficiency for the studied fuels: Higher air-fuel ratios result in better efficiency. The pressure drop in the char bed is higher for more reactive fuels, which in turn is caused by low porosity char beds.

Suggested Citation

  • Erlich, Catharina & Fransson, Torsten H., 2011. "Downdraft gasification of pellets made of wood, palm-oil residues respective bagasse: Experimental study," Applied Energy, Elsevier, vol. 88(3), pages 899-908, March.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:3:p:899-908
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    References listed on IDEAS

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    1. Dogru, M. & Howarth, C.R. & Akay, G. & Keskinler, B. & Malik, A.A., 2002. "Gasification of hazelnut shells in a downdraft gasifier," Energy, Elsevier, vol. 27(5), pages 415-427.
    2. Stassen, H.E., 1995. "Small-Scale Biomass Gasifiers for Heat and Power," Papers 296, World Bank - Technical Papers.
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