Application of biomass fast pyrolysis part II: The effects that bio-pyrolysis oil has on the performance of diesel engines

S.I. Yang, T.C. Hsu, C.Y. Wu, K.H. Chen, Y.L. Hsu and Y.H. Li

Energy, 2014, vol. 66, issue C, 172-180

Abstract: This study used the fast pyrolysis method to produce bio-oil from coffee bean residue. The oil was mixed with diesel fuel through emulsification to produce emulsified fuel with varying proportions. A single-cylinder diesel engine connected to a 12-kW power generation system was used as the test system to examine the performance indices of a diesel engine under various loads and rotational speeds when using three fuel mixtures with varying proportions of bio-oil (i.e., CPO (coffee bean residue pyrolysis oil) 0 (100% diesel), CPO 5 (5 vol.% bio-oil/95 vol.% diesel), and CPO 10 (10 vol.% bio-oil/90 vol.% diesel)). According to the results, compared to CPO 0, the addition of CPO 5 and CPO 10 increased the fuel consumed for the same power output. Although CPO 5 and CPO 10 had lower heating values that reduced combustion efficiency, the water content and emulsification properties of these fuels enhanced certain aspects of combustion. Increasing the proportion of bio-oil effectively reduced NOx emissions, but in certain situations, denser smoke was produced. The smoke resulted from the added bio-oil, which reduced heating values and combustion efficiency. The emulsification properties of the oil contributed to microexplosion of oil droplets, which enhanced combustion characteristics.

Keywords: Biomass; Fast pyrolysis; Bio-oil; Emulsion; Diesel engine (search for similar items in EconPapers)
Date: 2014
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (20)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:66:y:2014:i:c:p:172-180

DOI: 10.1016/j.energy.2013.12.057

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