The advantages of vacuum-treatment in the thermal upgrading of low-rank coals on the improvement of dewatering and devolatilization

被引:42
作者
Mahidin
Ogaki, Y
Usui, H [1 ]
Okuma, O
机构
[1] Kobe Univ, Dept Sci & Chem Engn, Kobe, Hyogo 6578501, Japan
[2] New Ind Res Org, NIRO, Kobe, Hyogo 6500047, Japan
关键词
upgrading; vacuum drying; devolatilization; low-rank coals;
D O I
10.1016/S0378-3820(03)00052-3
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
A new upgrading method for low-rank coals by a combined process of vacuum drying and tar coating has been developed, and some advantages have been observed. This upgrading technique is able to produce upgraded coals comparable to a bituminous coal; the surface of the coals can be effectively coated in order to suppress low-temperature oxidation and spontaneous combustion. The dewatering rate in the vacuum drying stage at 200 degreesC reached up to 93.81%, and degree of devolatilization significantly increased with elevation of upgrading temperature, from 15.7% at 200 degreesC to 35.9% at 300 degreesC. Furthermore, the specific surface area and susceptibility toward the low-temperature oxidation of coals were influenced by the upgrading treatment. (C) 2003 Elsevier Science B.V All rights reserved.
引用
收藏
页码:147 / 160
页数:14
相关论文
共 32 条
[31]  
VANKREVELEN DW, 1993, COAL TYPOLOGY PHYSIC, P673
[32]   LOW-RANK COAL SLURRIES FOR GASIFICATION [J].
WILLSON, WG ;
FARNUM, SA ;
BAKER, GG ;
QUENTIN, GH .
FUEL PROCESSING TECHNOLOGY, 1987, 15 :157-172