ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Combustion Behavior of Pulverized Coal and Ash Particle Properties during Combustion
Yasuaki UekiRyo YoshiieIchiro Naruse
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2015 Volume 55 Issue 6 Pages 1305-1312

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Abstract

CO2 emissions from blast furnaces should be reduced to curtail the impact of global warming. A promising solution is the low reducing agent rate (RAR) operation of blast furnaces. Char and ash particles derived from pulverized coal affect permeability in the furnace during low RAR operation. In our study, the combustion behavior and ash particle properties of pulverized coal during combustion were investigated. Char particles formed during combustion were sampled using a drop tube furnace, and then analyzed for their combustion ratio and ash particle properties. As a result, the combustion behavior of pulverized coal and properties of ash particles in raw coal were different by a coal type. Moreover, the combustibility of pulverized coal and the variation in ash particle properties during combustion were affected by the structure of the char particles.

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© 2015 by The Iron and Steel Institute of Japan
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