Improved Gasification of Rice Husks for Optimized Biochar Production in a Top Lit Updraft Gasifier
Improved Gasification of Rice Husks for Optimized Biochar Production in a Top Lit Updraft Gasifier作者机构：Malaysian Institute of Chemical and Bioengineering Technology (MICET) Universiti Kuala Lumpur Kuala Lumpur Malaysia Section of Industrial Chemistry Department of Chemistry Makerere University Kampala Uganda Invention Plus Limited Kampala Uganda Norwegian Geotechnical Institute (NGI) Oslo Norway
出 版 物：《Journal of Sustainable Bioenergy Systems》 (可持续生物质能源系统（英文）)
年 卷 期：2014年第4卷第4期
页 面：225-242页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Equivalence Ratio Biochar Carbonization Yield Specific Gasification Rate
摘 要：Biochar is a solid material obtained from the carbonization of biomass. If properly produced, it is useful for soil application to enrich plant values. Rice husk (RH) waste, an abundant agricultural by-product, was gasified in a top-lit updraft Belonio rice husk gasifier with a biochar yield of 29.0% ± 1.9%. The equivalence ratio (ER) for optimum biochar production was identified and its effect on biochar properties such as pH, volatile matter (VM), fixed carbon (FC) and ash content (AC), electricity consumption, biochar yield, specific gasification rate (SGR) as well as reactor temperature investigated and statistically analyzed. As ER increased from 0.292 ± 0.005 to 0.442 ± 0.016, the SGR decreased from 85.4 ± 4.5 kg/(m2hr) to 51.6 ± 2.4 kg/(m2hr) whereas reactor temperature increased linearly with ER. The original VM content of RH was found to be 76.1% ± 1.2% and decreased with increasing ER from 14.1% ± 0.2% to 10.6% ± 0.3%. The original FC and AC of 5.49% ± 0.22% and 9.10% ± 1.23% increased with ER from 50.5% ± 0.7% to 51.3% ± 0.4% and 33.7% ± 0.4% to 36.7% ± 0.1% respectively. The biochar pH at low, medium and high ER was 9.36 ± 0.11, 9.64 ± 0.03 and 9.42 ± 0.01, respectively. Results revealed a significant change in biochar yield and proximate values as ER changes from low to high.
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