The Effects of Process Parameters on the Pyrolysis of Empty Fruit Bunch (EFB) Using a Fixed-Bed Reactor

Abstract:

Malaysia is well-known as one of the main producer and exporter of palm oil. With the high production of crude palm oil (CPO), huge amount of empty fruit bunch was generated as by-products. The abundant amount of EFB produced required careful waste management procedures. Pyrolysis is thermochemical decomposition of biomass in inert environment towards its conversion into bio-oil, bio-char and gas. In this study, the pyrolysis of empty fruit bunch (EFB) was conducted using a fixed bed reactor. The pertinent process parameters such as pyrolysis temperature, particle sizes and heating rates were investigated via the determination of the percentage product yields such as bio-oil, bio-char and gas. The first series of experiment was conducted to determine the effect of pyrolysis temperatures. The final pyrolysis temperature was varied at 300, 400, 500, 600 and 700 °C at constant heating rates and the nitrogen flowrates of 30 °C/min and 100 cm³/min respectively. It was determined that at pyrolysis temperature of 500 °C maximum bio-oil yield of 35.00 % was obtained with bio-char and gas yield of 26.98 and 38.02% respectively. In the second series of experiment, the effect of particle sizen was studied. The EFB particle was varied at <125, 125-250, 250-500, 500-710 and 710-1000 μm. The pyrolysis temperature was fixed at 500 °C with nitrogen flowrate of 100 cm³/min and heating rate of 30 °C/min. It was determined that using EFB particle size of 250-500 μm, the maximum bio-oil of 38.52% was achieved with bio-char and gas yields of 25.06 % and 36.42% respectively. In the third series of experiment to determine the effect of heating rates, the heating rates was varied at 10, 20, 30, 40, 50 and 60 °C/min towards the final pyrolysis temperature of 500 °C with constant nitrogen flowrates of 100 cm³/min. The results obtained showed that the highest amount of bio-oil of 40.81% was obtained when the heating rate of 20 °C/min was used. The bio-char and gas yield obtained were 24.69% and 34.50% respectively.

• Periodical: Advanced Materials Research (Volume 925)
• Pages: 115-119
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.925.115
• Online since: April 2014
• Authors: A.R. Mohamed*, Zainab Hamzah, Mohamed Zulkali Mohamed Daud
• Keywords: Bio-Oil, Empty Fruit Bunch, Fixed-Bed Reactor, Pyrolysis

References

[1] Shuit, S.H., Tan, K.T., Lee, K.T. 2009. Oil palm biomass as a sustainable energy source: A Malaysian case study. Energy 34 (2009), 1225-1235.

DOI: 10.1016/j.energy.2009.05.008

[2] Mazaheri, K., Lee, T.K., Bhatia,S., Mohamed, A.R. 2010. Subcritical water liquefaction of oil palm fruit press fiber for the production of bio-oil: Effect of catalysts. Bioresource Technology 101, 745-751.

DOI: 10.1016/j.biortech.2009.08.042

[3] Vijaya, S., Ma, A.N., Choo, Y.N. and Nik Meriam N.S. 2008. Life cycle inventory of the production of crude palm oil- a gate to gate case study of 12 palm oil mills. Journal of Oil Palm Research, Vol 20, pp.484-494.

DOI: 10.3844/ajessp.2009.267.272

[4] Demirbas, M.F., Balat, M. 2007. Biomass pyrolysis for liquid fuels and chemicals: A review. Journal of Scientific and Industrial Research , Vol 66, pp.797-804.

[5] Wang, P., Zhan, S., Yu, H., Xue, X., Hong,N. 2010. The effects of temperature and catalysts on the pyrolysis of industrial wastes (herb residue). Bioresource Technology 101, 3236-3241.

DOI: 10.1016/j.biortech.2009.12.082

[6] Putun, A.E., Ozcan, A., Putun, E. 1999. Pyrolysis of hazelnut shells in a fixed-bed tubular reactor: yields and structural analysis of bio-oil. Journal of Analytical and Applied Pyrolysis 52, 33-49.

DOI: 10.1016/s0165-2370(99)00044-3

[7] Acikalin K., Karaca, F., Bolat, E. 2012. Pyrolysis of pistachio shell: Effects of pyrolysis conditions and analysis of products. Fuel 95, 169-177.

DOI: 10.1016/j.fuel.2011.09.037

[8] Demirbas, A., Caglar, A., Akdeniz, F., Gullu, D. 2000. Conversion of olive husk to liquid fuel by pyrolysis and catalytic liquefaction. Energy Sources 22: 7, 631-639.

DOI: 10.1080/00908310050045582

[9] Uzun, B.B., Apaydin-Varol, E., Ates, F., Ozbay, N., Putun, A.E. 2010. Synthetic fuel production from tea waste: Characterisation of bio-oil and bio-char. Fuel 89, 176-184.

DOI: 10.1016/j.fuel.2009.08.040

[10] Sensoz, S., Kaynar, I. 2006. Bio-oil production from soybean (Glycine max L. ); fuel properties of bio-oil. Industrial Crops and Products 23, 99-105.

DOI: 10.1016/j.indcrop.2005.04.005

[11] Gercel, H.F. 2011. Bio-oil production from Onopordum acanthium L. by slow pyrolysis. Journal of Analytical and Applied Pyrolysis 92, 233-238.

DOI: 10.1016/j.jaap.2011.06.002