Investigation of the effect of coal particle sizes on the interfacial and rheological properties of coal-water slurry fuels: Final report, July 1, 1994-June 30, 1996

Hydrotransport of coal, iron ore, bauxite and other solid materials is known to be carried out through trunk pipelines. Hydrotransport of coal in the form of highly concentrated coal-water slurries (HCCWS) makes it possible to solve a whole range of problems from environmental ones to those when HCCWS are used as a fuel for energy boilers. The HCCWS combustion efficiency is determined by the concentration of the solid pulp phase and the particle size. The highest HCCWS combustion efficiency is observed when the mass concentration of the solid phase is 60--65 % and the particle size is up to 0.02 sm. In order to achieve stability of these slurries with the solid phase concentration, various additives are used to improve the rheological properties of coal-water slurries. In particular, such plasticizing agents as sodium tripolyphosphate, technical lignosulfonates, carbon-alkaline reagents and others are used. Plasticizing agents are known to change the rheological properties of coal-water slurries but the problems of corrosion activity of plasticizing agents are not well understood, especially with respect to welded joints of pipelines. Welded joints of slurry pipelines can be represented as macro-galvanic couples, in which the weld and base metal are electrodes of a galvanic element. The current magnitude of the macro-galvanic couple can be used to calculate the local corrosion value due to the work of the galvanic element of the base metal and the weld. The paper studies the effect of technical lignosulfonates (TLS) and TLS-based compositions in a coal-water slurry on the local currents of the base metal --- weld macro-galvanic couple made of 09G2S steel. Findings of research show that in the water-coal slurry the maximum inhibitory effect is observed when 0.75 % TLS + 0.25 % K2CrO4 (Na2CO3) is added to the slurry.

EFFECT OF COAL PARTICLE SIZE ON COAL-WATER SLURRY (CWS) ATOMIZATION

Atomization and Sprays ◽

10.1615/atomizspr.v8.i5.20 ◽

1998 ◽

Vol 8 (5) ◽

pp. 503-521 ◽

Cited By ~ 19

Author(s):

S. Y. Son ◽

Kenneth D. Kihm

Keyword(s):

Particle Size ◽

Coal Particle ◽

Water Slurry ◽

Coal Water Slurry

Performance Study of Coal Water Slurry

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.716-717.16 ◽

2014 ◽

Vol 716-717 ◽

pp. 16-19

Author(s):

Ke Gai ◽

Hui Li Qi ◽

Dong Ping Ma ◽

Wen Li Liang

Keyword(s):

Rheological Property ◽

Rheological Properties ◽

Apparent Viscosity ◽

Performance Study ◽

Water Slurry ◽

Coal Water Slurry ◽

The Stability ◽

Increasing Temperature

This paper is based on the research of the coal water slurry rheological property and stability. The influence of the concentration, additives and temperature on the rheological properties of the slurry has also been studied. The apparent viscosity increases with increasing concentration of coal water slurry, and decreases with increasing temperature. An introduction of additives can greatly improve the rheological properties of coal water slurry. The stability of coal water slurry increases with the increase of concentration, and the stability decreases with the increase of temperature. A proper amount of additives can improve its stability.

Influence of rheological properties on air-blast atomization of coal water slurry

Journal of Non-Newtonian Fluid Mechanics ◽

10.1016/j.jnnfm.2014.06.007 ◽

2014 ◽

Vol 211 ◽

pp. 1-15 ◽

Cited By ~ 27

Author(s):

Hui Zhao ◽

Yan-Bing Hou ◽

Hai-Feng Liu ◽

Xiu-Shan Tian ◽

Jian-Liang Xu ◽

...

Keyword(s):

Rheological Properties ◽

Air Blast ◽

Water Slurry ◽

Coal Water Slurry

Coal-water slurry systems for oil-design power plants. Final report

10.2172/5841125 ◽

1979 ◽

Author(s):

R. D. Glenn ◽

A. W. Rhodes

Keyword(s):

Power Plants ◽

Final Report ◽

Water Slurry ◽

Coal Water Slurry ◽

Design Power