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Quality assessment of bio-oil and biochar from microwave-assisted pyrolysis of corn stover using different adsorbents
Journal of the Energy Institute ( IF 5.7 ) Pub Date : 2021-06-14 , DOI: 10.1016/j.joei.2021.06.008
Ahmed Elsayed Mahmoud Fodah , Manoj Kumar Ghosal , Debaraj Behera

Biofuels in the form of bio-oil and biochar have been produced by microwave heating of corn stover. Different adsorbents such as silicon carbide (SiC) and activated carbon (AC) with different ratios (10%, 20%, and 30%) to corn stover are investigated with the aims of enhancing the absorption of the microwave, maximizing the yields of the desirable products i.e. bio-oil followed by biochar as well as improving their qualities. Use of both the adsorbents improved the heating performance through increase in the maximal temperature and heating rate by 170 °C and 36 °C/min respectively compared to without adsorbent. Use of AC increased the yield of bio-oil up to 45 wt% while SiC increased the gas yields up to a maximum value of 48 wt%. The better physical properties such as 37%, 5.3, 2.9 mPa s, and 1 g/mL for water content, pH, viscosity and density respectively of bio-oil were obtained when using AC as an adsorbent. Also, use of AC helped in producing bio-oils which contained higher carbon and hydrogen contents as well as high calorific value (17 MJ/kg). Similarly, use of AC increased the contents of hydrocarbons and phenols in the bio-oil up to 36% and 28% respectively with low oxygen-containing compounds (2%). Also, use of AC produced the biochar having cleanest pores that were almost free of carbon-like impurities with a higher surface area of the pore (105.2 m2/g). In addition, biochar having low ash content, high carbon content, and calorific value (28 MJ/kg) were achieved. The net energy recovery with respect to raw corn stover was calculated to be of maximum value i.e., 55% when using AC. The AC and SiC were reused for further runs of the experiments (5 times) with few changes in the heating behavior and the yields of the pyrolytic products.



中文翻译:

不同吸附剂对玉米秸秆微波辅助热解生物油和生物炭的质量评价

生物油和生物炭形式的生物燃料已经通过玉米秸秆的微波加热生产。研究了不同的吸附剂,如碳化硅 (SiC) 和活性炭 (AC) 与玉米秸秆的不同比例(10%、20% 和 30%),目的是增强微波的吸收,最大限度地提高微波收率。理想的产品,即生物油,然后是生物炭,并提高其质量。与不使用吸附剂相比,两种吸附剂的使用都提高了加热性能,最大温度和加热速率分别提高了 170 °C 和 36 °C/min。AC 的使用将生物油的产量提高到 45%(重量),而 SiC 将气体产量提高到 48%(重量)的最大值。更好的物理特性,例如 37%、5.3、2.9 mPa s 和 1 g/mL 的水含量、pH、以活性炭为吸附剂,分别得到生物油的粘度和密度。此外,使用 AC 有助于生产含有更高碳和氢含量以及高热值 (17 MJ/kg) 的生物油。同样,使用 AC 使生物油中碳氢化合物和酚类的含量分别增加了 36% 和 28%,含氧量低(2%)。此外,使用活性炭生产的生物炭具有最干净的孔隙,几乎不含碳类杂质,孔隙表面积更高(105.2 m 使用 AC 将生物油中碳氢化合物和酚类的含量分别增加了 36% 和 28%,含氧量低(2%)。此外,使用活性炭生产的生物炭具有最干净的孔隙,几乎不含碳类杂质,孔隙表面积更高(105.2 m 使用 AC 将生物油中碳氢化合物和酚类的含量分别增加了 36% 和 28%,含氧量低(2%)。此外,使用活性炭生产的生物炭具有最干净的孔隙,几乎不含碳类杂质,孔隙表面积更高(105.2 m2 /克)。此外,还实现了低灰分、高碳含量和热值(28 MJ/kg)的生物炭。当使用 AC 时,生玉米秸秆的净能量回收被计算为最大值,即 55%。AC 和 SiC 被重新用于进一步的实验(5 次),加热行为和热解产物的产率几乎没有变化。

更新日期:2021-06-17
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