Co-combustion, co-densification, and pollutant emission characteristics of charcoal-based briquettes prepared using bio-tar as a binder

FUEL

卷:287

Article

Cong, Hongbin¹  Yao, Zonglu²  Masek, Ondrej³  Meng, Haibo¹  Sheng, Chenxu^1,4  Wu, Yunong¹  Zhao, Lixin² 

[1] Minist Agr & Rural Affairs, Acad Agr Planning & Engn, Key Lab Energy Resource Utilizat Agr Residue, Beijing 100125, Peoples R China

[2] CAAS, Inst Environm & Sustainable Dev Agr, Beijing 100081, Peoples R China

[3] Univ Edinburgh, UK Biochar Res Ctr, Sch Geosci, Kings Bldg, Edinburgh EH93FF, Midlothian, Scotland

[4] Heilongjiang Bayi Agr Univ, Daqing 163319, Peoples R China

关键词: Charcoal-based briquette;    Bio-tar;    Fuel property;    Co-densification;    Pollutant emission;   

DOI  :  10.1016/j.fuel.2020.119512

来源: Elsevier

【 摘 要 】

In this study, charcoal-based briquettes prepared using bio-tar as a binder are proposed as a substitute for conventional coal in rural China; furthermore, the fuel properties of the blends of charcoal, semi-coke, and bio-tar and the co-densification and pollutant emission characteristics of charcoal-based briquettes are investigated. The addition of charcoal improved the heating value and combustion index; however, the addition of a small amount of bio-tar did not have any significant effect on the fuel properties of the charcoal and semi-coke blend. The blending of charcoal and semi-coke with a mass ratio of 1:1 increased the integrated combustion characteristics from 7.73 x 10(-12) (only semi-coke) to 16.92 x 10(-12) K(-3)min(-2). Results of the co-densification experiments suggest that the bio-tar effectively improved the physical stability of charcoal-based briquette. By increasing the addition of bio-tar from 0 to 9 wt% at the densification temperature of 20 degrees C, the strength compaction and drop resistance increased by 8.6% and 13.9%, respectively. Increasing the densification temperature from 20 to 50 degrees C resulted in negative effects on mechanical strength. Pollutant emissions were observed during the ignition, stable combustion, and burnout phases of the stove. The bio-tar addition had distinct negative influences, increasing the total suspended particle and VOC emissions, which could be effectively weakened or eliminated by adding 3 wt% of hydrated lime. Herein, the applied chain and technical chain of charcoal-based briquettes are summarized. The study provides technical support for the industrial application of charcoal-based briquettes in rural China, with replication potential elsewhere.

【 授权许可】

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