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Shuai Guo,Xiaoyan Xiong,Deyong Che,Hongpeng Liu,Baizhong Sun 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.1
In view of the importance of inert-atmosphere sludge pyrolysis for effective waste recycling and carbon emission reduction, this study probed the effects of temperature (300-700 oC) and atmosphere (100% N2, 10 CO2/90% N2, or 100% CO2) on the properties of biochar and gases obtained by sludge pyrolysis in a horizontal tube furnace. The emissions of NO, SO2, H2S, and CO increased with increasing temperature, as the inhibitory effect of CO2 on the formation of these gases (observed at <500 oC) concomitantly weakened and was superseded by the reaction of CO2 with carbon at higher temperature to afford gaseous products. The specific surface area (SBET) and pore volume of the biochar produced in the presence of CO2 increased with increasing temperature up to 500 oC, while at higher temperatures the inhibitory effect of CO2 on pore structure development resulted in a decreased SBET and an increased macropore content. These results show that pyrolysis is an effective treatment method for sludge; it can remove 48% N and 50% S in sludge and mitigate the emission of polluting gases. When CO2 participates in the pyrolysis reaction, the SBET of biochar increases significantly. In general, sludge biochar has the potential to be applied as fuel and as an adsorbent.
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Response surface analysis of energy balance and optimum condition for torrefaction of corn straw
Shuai Guo,Tiankuo Guo,Deyong Che,Hongpeng Liu,Baizhong Sun 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.5
Corn straw has potential as a biofuel, and is generated in large amounts globally. However, this potentialremains underutilized, and torrefaction is one of the processes that can be implemented to improve the energy grade ofthis biomass. In this study, three process parameters (temperature, heating rate, residence time) were investigated usinga response surface method to optimize the torrefaction process of corn straw. At 242.26 oC, a 60 min residence time,and 6.28 oC/min heating rate, the mass yield and higher heating value (HHV) reached their maximum values. Temperaturewas the most important factor influencing torrefaction, followed by residence time and then heating rate. Thegas and liquid by-products were measured by mass spectrometry and mass spectrometry-gas chromatography, and theheat demand of torrefaction was measured by thermogravimetric analysis-differential scanning calorimetry. The HHVof the by-products changed little before 240 oC but increased considerably as the temperature further increased. TheHHV at 242 oC was 1,273 kJ/kg. When the heat loss was 50%, 242 oC was the critical point of energy balance, and afterthat the torrefaction process was energy self-sufficient. These findings provide data to support the establishment ofsemi-industrial or industrial corn straw torrefaction devices.
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