Comparative study of the combustion properties of briquettes produced from blends of mung beans shell, uncarbonized and carbonized sawdust

Chinyere E. Umeocho, Cletus O. Ezidi, Eucharia N. Nwosu, Clementina I. Nwankwo, Kingsley C. Ezejiegu, Theresa U. Onuegbu
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Abstract

In this research, the combustion properties of the briquette produced by blending mung beans shell (MBS) with carbonized danta wood sawdust was compared with that of the briquette produced by blending MBS with uncarbonized danta wood sawdust. The briquettes wereproduced atdifferentsawdust to biomass ratios (100%:0, 70%:30%, 50%: 50%, 30%: 70% and 100%:0). Cassava starch was used as a binder. Proximate analysis (moisture content, ash content, volatile matter and fixed carbon) and combustion properties (calorific value, ignition time, burning time, burning rate, specific fuel consumption and thermal efficiency) were calculated using standard methods. The results of the analyses showed that 100% sawdust briquette samples had the lowest moisture content, 4.74±0.00 for carbonized sawdust and 6.76±0.02 for uncarbonized sawdust.100% uncarbonized and carbonized sawdust briquette samples had a fixed carbon of 68.93±0.02 and 87.46%, Ash content:3.70±0.00% and 2.18±0.04%,volatile matter: 20.61±0.00 and 5.61±0.04 and calorific value: 29.401±0.0 MJ/Kg and 32.532±0.05 MJ/Kg respectively.The ignition time increase with increase in biomass load for uncarbonized sawdust samples and decrease with increase in biomass load for carbonized sawdust briquette samples. The burning time decreased from 86±0.57mins (70% sawdust + 30% biomass) to 70±0.57mins (100% biomass) for the carbonized sawdust briquette samples and for the uncarbonized, it ranged from 68±0.00 (70% sawdust + 30% biomass) to 71.6±0.57 mins (30% sawdust + 70% biomass) and then dropped to 68±0.57(100% biomass load). The burning rate decreased in carbonizedbriquette samples and increased in uncarbonized briquette samples with increase in biomass load. The specific fuel consumption for carbonized and uncarbonized sawdust briquette sample decreased with increase in MBS load. 100% carbonized and uncarbonized sawdust briquette samples had a thermal efficiency of 8.78 and 16.47 respectively. It can be concluded that blend of carbonized sawdust and mung beans shell will make a better fuel due to better combustion properties than the uncarbonized sawdust samples.
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绿豆壳、未碳化锯末和碳化锯末混合物生产的煤球燃烧性能比较研究
本研究比较了绿豆壳(MBS)与碳化丹塔木锯屑混合制成的煤块与绿豆壳与未碳化丹塔木锯屑混合制成的煤块的燃烧性能。压块是按不同的锯屑与生物质比率(100%:0、70%:30%、50%:50%、30%:70% 和 100%:0 )生产的。木薯淀粉用作粘合剂。使用标准方法计算了近似分析(水分含量、灰分含量、挥发性物质和固定碳)和燃烧特性(热值、点火时间、燃烧时间、燃烧速率、特定燃料消耗和热效率)。分析结果表明,100% 木屑压块样品的含水量最低,碳化木屑为 4.74±0.00,未碳化木屑为 6.76±0.02;100% 未碳化和碳化木屑压块样品的固定碳分别为 68.93±0.02 和 87.46%;灰分含量:3.70±0.00% 和 2.18±0.04%;挥发物:20.61±0.00 和 20.61±0.00:未碳化锯末样品的点火时间随生物量的增加而增加,碳化锯末压块样品的点火时间随生物量的增加而减少。碳化锯末压块样品的燃烧时间从86±0.57分钟(70%锯末+30%生物质)减少到70±0.57分钟(100%生物质),而未碳化锯末压块样品的燃烧时间从68±0.00(70%锯末+30%生物质)到71.6±0.57分钟(30%锯末+70%生物质),然后减少到68±0.57(100%生物质)。随着生物质载量的增加,碳化煤球样品的燃烧速率下降,而未碳化煤球样品的燃烧速率上升。随着 MBS 负荷的增加,碳化和未碳化锯末压块样品的特定燃料消耗量均有所下降。100%碳化和未碳化锯末压块样品的热效率分别为 8.78 和 16.47。由此可以得出结论,与未碳化的锯末样品相比,碳化锯末和绿豆壳的混合燃料具有更好的燃烧性能。
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Comparative study of the combustion properties of briquettes produced from blends of mung beans shell, uncarbonized and carbonized sawdust
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