Effect of microwave pretreatment of coal for improvement of rheological characteristics of coal-water slurries

被引:67
作者
Meikap, BC [1 ]
Purohit, NK
Mahadevan, V
机构
[1] Deemed Univ, Dept Chem Engn, Natl Inst Technol, Rourkela, India
[2] Indian Inst Technol, Dept Chem Engn, Kharagpur 721302, W Bengal, India
关键词
microwave treatment; coal slurries viscosity; rheological properties; slurry transport;
D O I
10.1016/j.jcis.2004.08.084
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Indian high-ash coal contains a-silica components of the mineral matter. When coal is transported in the form of a slurry, a-silica adds to the settling properties of coal and enhances erosion of pipelines. As Such any technique that will contribute to changing the characteristics of mineral matter by selective demineralization is bound to Supplement the knowledge of coal slurries in the science of rheology. One such method is the use of a novel microwave technology, which changes the a-silica to less harmful beta-silica. Thus microwave-treated coal slurry facilitates enhanced flow characteristics and abates the erosion problem in pipeline transport as well as in coal-slurry injection furnaces. This paper reports on the rheological study of closely sized coal particles of medium-volatile, low-ash, low-moisture cleans and high-ash rejects with and without microwave treatment. Viscosity of suspensions of microwave-treated coal was found to be less than that of untreated coal, in the case of both cleans and rejects. Microwave pretreatment thus reduces the viscosity and the Pumping cost and opens a new outlook for pipeline transport. An attempt has been made to quantify the improvement of rheological characteristics due to microwave pretreatment. (C) 2004 Elsevier Inc. All rights reserved.
引用
收藏
页码:225 / 235
页数:11
相关论文
共 22 条
[1]  
BEESON JL, 1975, P 10 ANN MICR POW S, P56
[2]  
BOTSARIS GD, 1983, 5 INT S COAL SLURR C, P78
[3]  
FANSLOW GE, 1980, J MICROWAVE POWER EE, V15, P187
[4]   ON VISCOSITY OF A CONCENTRATED SUSPENSION OF SOLID SPHERES [J].
FRANKEL, NA ;
ACRIVOS, A .
CHEMICAL ENGINEERING SCIENCE, 1967, 22 (06) :847-&
[5]   RHEOLOGICAL PROPERTIES OF SUSPENSIONS OF RIGID PARTICLES [J].
JEFFREY, DJ ;
ACRIVOS, A .
AICHE JOURNAL, 1976, 22 (03) :417-432
[6]  
MEIKAP BC, 2002, P NAT SEM PROSP CHEM, P47
[7]   RHEOLOGICAL STUDY OF CONCENTRATED SILICA SUSPENSIONS [J].
MISHRA, PN ;
SEVERSON, DE ;
OWENS, TC .
CHEMICAL ENGINEERING SCIENCE, 1970, 25 (04) :653-&
[8]  
MUNRO JM, 1979, AICHE J, V25, P335
[9]   FREQUENCY-DEPENDENCE OF THE DIELECTRIC-PROPERTIES OF COAL .2. [J].
NELSON, SO ;
BECKMONTGOMERY, SR ;
FANSLOW, GE ;
BLUHM, DD .
JOURNAL OF MICROWAVE POWER AND ELECTROMAGNETIC ENERGY, 1981, 16 (3-4) :319-326
[10]   RHEOLOGICAL PROPERTIES OF COAL OIL MIXTURE FUELS [J].
PAPACHRISTODOULOU, G ;
TRASS, O .
POWDER TECHNOLOGY, 1984, 40 (1-3) :353-362