Improved yield and higher heating value of biochar from oil palm biomass at low retention time under self-sustained carbonization

JOURNAL OF CLEANER PRODUCTION

卷:104

Article

Idris, Juferi^1,2,3  Shirai, Yoshihito¹  Anduo, Yoshito¹  Ali, Ahmad Amiruddin Mohd¹  Othman, Mohd Ridzuan⁴  Ibrahim, Izzudin⁵  Husen, Rafidah⁶  Hassan, Mohd Ali^4,5 

[1] Kyushu Inst Technol, Grad Sch Life Sci & Syst Engn, Dept Biol Funct & Engn, Wakamatsu Ku, Kitakyushu, Fukuoka 8080196, Japan

[2] Univ Teknol MARA UiTM Sarawak, Fac Chem Engn, Kota Samarahan 94300, Sarawak, Malaysia

[3] Univ Teknol MARA UiTM Malaysia, Fac Chem Engn, Shah Alam 40450, Malaysia

[4] Univ Putra Malaysia, Fac Engn, Dept Proc & Food Engn, Upm Serdang 43400, Selangor, Malaysia

[5] Univ Putra Malaysia, Fac Biotechnol & Biomol Sci, Dept Bioproc Technol, Serdang 43400, Selangor, Malaysia

[6] Univ Teknol MARA UiTM Sarawak, Fac Sci Appl, Kota Samarahan 94300, Sarawak, Malaysia

关键词: Biochar;    Charcoal;    Heating value;    Oil palm biomass;    Self-sustained carbonization;    Waste management and utilization;   

DOI  :  10.1016/j.jclepro.2015.05.023

来源: Elsevier

【 摘 要 】

Oil palm biochar with high yield and higher heating value under low energy requirement is required for improved waste management and utilization in the palm oil industry. This paper presents, a self-sustained carbonization of oil palm empty fruit bunch biomass, without internal heating element, which produced high biochar yield and higher heating value. Three different particle sizes of pressed-shredded oil palm empty fruit bunch biomass, i.e. below 29 mm, 30-99 mm and 100-150 mm, at 8 -10% moisture content were used. The carbonization temperature was monitored and used as an indicator to stop the carbonization prior to harvesting. The maximum carbonization temperature recorded was 600 degrees C In our previous report, harvested at 300 degrees C under uncontrolled exhausted air flow rate and found that the higher heating values obtained were 23.0-25.0 MJ/kg. However the biochar yield was only 14-16 %. In order to increase the yield of biochar, the exhaust air flow rate has been fixed at 36 m(3)/hr by using an air suction blower to ensure uniform circulation and distribution of hot air from top to bottom before being discharged. The biochar was harvested when the temperature of the bed decreased to 500 degrees C. The particle size range from 100 to 150 mm produced the highest biochar yield of 26.0 +/- 1.2% with higher heating value of 23.0-23.5 MJ/kg within 5-8 h retention time. The gaseous emissions were lower than permitted level set by the environmental authorities. The technology developed in this study should be used to improve the management and utilization of oil palm biomass towards a more sustainable palm oil industry. (C) 2015 Elsevier Ltd. All rights reserved.

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