Hydrothermal dewatering of low-rank coals: Influence on the properties and combustion characteristics of the solid products

Ullah H., Liu G., Yousaf B., Ali M. U., Abbas Q., Zhou C., ...Daha Fazla

ENERGY, cilt.158, ss.1192-1203, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 158
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1016/j.energy.2018.06.052
  • Dergi Adı: ENERGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1192-1203
  • Anahtar Kelimeler: Hydrothermal dewatering, Low-rank coal, Combustion, FTIR, Ignition, Burnout, FIRED POWER-PLANT, HIGH ASH COAL, BROWN-COAL, THERMOGRAVIMETRIC ANALYSIS, TORREFIED BIOMASS, DRIED PRODUCTS, LIGNITE, WATER, COCOMBUSTION, CHINESE
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

The presence of increased moisture content, low energy density and maximum spontaneous combustion tendency has raised serious environmental issues, which are obstacles to large scale utilization of coals. Hydrothermal dewatering (HTD) is a promising method for upgrading low rank coals (LRCs). The influences of HTD, executed at different temperatures on solid product yield, removal rate of elements, organics and inorganics, and combustion characteristics in LRCs were studied. HTD treatment of LRCs was carried out in 2 L cylindrical autoclave at 200-300 degrees C for 1 h. For upgraded coals, the inherent moisture and oxygen content decreased significantly while fixed carbon content and calorific value increased. FTIR results indicate the conversion of LRCs near to high-rank coals (HRCs). The organic matter was removed due to loss of Methylene, Methyl groups and O-containing functional groups, whereas inorganic matter was removed mainly in the forms of Fe and Ca-containing minerals. The upgraded coals had higher ignition and burnout temperatures, while their combustion was shifted and delayed toward higher temperature zone. Activation energy of treated coals increased in ignition stage while decreased in combustion segment. Prominent changes were found in coal structure, composition, rank, and combustion characteristics at HTD temperature of 300 degrees C. (C) 2018 Elsevier Ltd. All rights reserved.