A theoretical analysis on combustion intensification for blended coal in rotary cement kiln

Blended coal that consists of 70% anthracite and 30% bituminous coal is cheaper than pure bituminous coal, but it is very difficult to burn in the rotary cement kiln. To burn the blended coal, a new kind of burner, which is called the burner with velocity difference jets, is used to intensify combus...

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Bibliographic Details
Published in:Fuel (Guildford) 2001-09, Vol.80 (11), p.1645-1650
Main Authors: Hou, Ling Yun, Fu, Wei Biao, Zhang, Yong Jun
Format: Article
Language:English
Subjects:
Applied sciences
Blended coal
Combustion intensification
Combustion of solid fuels
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
General model
Rotary cement kiln
Theoretical studies. Data and constants. Metering
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Summary:Blended coal that consists of 70% anthracite and 30% bituminous coal is cheaper than pure bituminous coal, but it is very difficult to burn in the rotary cement kiln. To burn the blended coal, a new kind of burner, which is called the burner with velocity difference jets, is used to intensify combustion. However, combustion intensification and the formation of stable sintering layer should be ensured simultaneously in the cement industry. To compromise the above two aspects, the better burner construction is decided by simulation. The combustion processes in the rotary cement kiln are simulated by means of improved multi-fluid model for two-phase turbulent flows with reaction. The results of integral simulation show that the ignition of blended coal is slower than that of bituminous coal, but the flame of blended coal is longer than that of bituminous coal. Thus the use of blended coal not only reduces the cost but also more suits wet kiln.
ISSN:0016-2361
1873-7153
DOI:10.1016/S0016-2361(01)00037-0