Role Study of Bio-char from Agricultural Waste for Utility of Energy and Carbon Sequestration
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Bio-char production from agricultural waste as Corncob, Corn stalks, Parchment of coffee and Wampee seed with slow pyrolysis production were considered in this study. To demonstrate in the properties of bio-char from the laboratory scale production and comparing with that from the 200 liters of bio-char stove in the scale for a community based. The production of bio-char briquettes was regarded for the role of bio-char to an appropriate in terms of energy, economics and environment. This result shown that, increasing of pyrolysis temperature had an effect to decreasing of bio-char yield but increasing the heating value. Bio-char from corncob had the higher heating value (HHV) more than the bio-char from another biomass in the value of 14.61 – 21.50 MJ/kg under the pyrolytic temperature of 300 – 600oC. The effect of biomass size and holding time appeared that not significantly different to the yield and properties of bio-char as 18.14% and 2.50% respectively. The bio-char production from 200 liters stove found that, the yield of bio-char as 33.33 %wt of biomass, the properties of bio-char as volatile matter and ash content had higher than that from the production in the laboratory while the fixed carbon shown in the lower content. The production cost of bio-char as 0.30 Baht/kg, using in the bio-char briquettes production could produce in 2 ingredients of water with biochar in the proportion of 1:2.5 and water with starch and bio-char as 1 :1:2.5. The higher heating value of bio-char briquettes as 8.06 and 8.82 MJ/kg respectively under the density of fuel as 1.07 and 1.57 g/cm3 respectively. The production of the biochar briquettes as 5.71 Baht/kg and 7.81 Baht/kg respectively. The carbon footprint of the bio-char briquettes production were considered in two processes as bio-char production from 200 liters stove could give a total of greenhouse gas emissions as 1.045 kgCO2eq/kgbio-char and the bio-char briquettes production gave that as 2.724 kgCO2eq/kgbio-char briquettes in the ingredients that without a starch and 3.160 kgCO2eq/kgbiochar briquettes from another case.
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