Upgrading of woody biomass by torrefaction under pressure

บทความในวารสาร

ผู้เขียน/บรรณาธิการ

กลุ่มสาขาการวิจัยเชิงกลยุทธ์

ไม่พบข้อมูลที่เกี่ยวข้อง

รายละเอียดสำหรับงานพิมพ์

รายชื่อผู้แต่ง: Wannapeera J., Worasuwannarak N.

ผู้เผยแพร่: Elsevier

ปีที่เผยแพร่ (ค.ศ.): 2012

วารสาร: Journal of Analytical and Applied Pyrolysis (0165-2370)

Volume number: 96

หน้าแรก: 173

หน้าสุดท้าย: 180

จำนวนหน้า: 8

นอก: 0165-2370

eISSN: 1873-250X

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84861715497&doi=10.1016%2fj.jaap.2012.04.002&partnerID=40&md5=72ea4d179d78d44be69801e9e28064e2

ภาษา: English-Great Britain (EN-GB)

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บทคัดย่อ

In this study, the upgrading by torrefaction of leucaena, woody biomass, at 200-250ฐC under volumetric pressure up to 4 MPa was examined. It was found that the yield of torrefied leucaena decreased with the increase in torrefaction temperature, whereas at the same temperature the yield of torrefied leucaena increased with the increase in torrefaction pressure. From the elemental analyses, the higher carbon content in torrefied leucaena can be achieved by the rising of torrefaction pressure. As large as 92.6% of carbon was recovered in the torrefied leucaena prepared at 250ฐC and 4 MPa. On the other hand, the oxygen content decreased to 31.1% for the leucaena torrefied at 250ฐC and 4 MPa. The higher heating value (HHV) of leucaena torrefied at high pressure increased significantly when compared to that of leucaena torrefied at atmospheric pressure. As large as 94.3% of energy yield was achieved with the mass yield of 74.4% for the torrefaction at 250ฐC and 4 MPa. From the subsequent pyrolysis and combustion in TGA, leucaena torrefied under pressure showed the difference of weight decreasing curves comparing to that of leucaena torrefied at atmospheric pressure. It was found that the weight of leucaena torrefied at high pressure started to decrease at temperature lower than 200ฐC. The char yield at 800ฐC for the leucaena torrefied at high pressure increased with the increase in torrefaction pressure. These results suggested that the structure of leucaena was changed by the torrefaction under pressure and the cross-linking reactions during the pyrolysis were enhanced by the pressure during the torrefaction resulting in increase in char yields. The substantial increase in char combustion rate was also found for leucaena torrefied under pressure. ฉ 2012 Elsevier B.V. All rights reserved.

คำสำคัญ

Biomass, Torrefaction, upgrading